import { del, get, post, put, stream } from "./js/api.js?v=20260909-account-controls";
import { regenerateInline } from "./js/regeneration.js";
import { appendSources, createWebSearchToggle } from "./js/webSearch.js";
import { appendAttachments, createAttachmentComposer } from "./js/attachments.js";
import { createReasoningToggle, finishReasoning, updateReasoning } from "./js/reasoning.js?v=20260921-reasoning-capability";
import { closeChatDrawer, openChatDrawer } from "./js/chatDrawer.js?v=20260909-account-controls";
import { onboardingPrompts, requestedChatId } from "./js/constants.js?v=20260909-account-controls";
import { getModelProfile } from "./js/modelProfiles.js?v=20260909-account-controls";
import { applyTheme as applySharedTheme, applyThemeMode as applySharedThemeMode, readStoredAppearance } from "./js/themeController.js?v=20260909-account-controls";
import {
    activeChatTitle,
    activeUserPersonaStatus,
    chatActivityDetail,
    chatActivityEyebrow,
    chatActivityOverlay,
    chatActivityTitle,
    chatCharacterPill,
    chatDrawerPersonaValue,
    chatDiv,
    chatList,
    chatListLoading,
    chatListLoadingText,
    chatSidebar,
    chatSidebarToggle,
    chatSearchInput,
    chatUserPersonaPill,
    chatTemperatureInput,
    chatContextLengthInput,
    chatResponseLengthInput,
    chatSystemInstructionInput,
    clearChatBtn,
    archiveChatBtn,
    backupWorkspaceBtn,
    clearUserPersonaBtn,
    exportChatBtn,
    importWorkspaceBtn,
    manageChatMemoryBtn,
    managePersonaStateBtn,
    importWorkspaceFileInput,
    headerModelName,
    headerPersonaName,
    moveChatFolderBtn,
    messagesDiv,
    modelBadgeName,
    modelCount,
    modelHelpBadge,
    modelHelpSummary,
    modelHelpTitle,
    modelSection,
    modelSelect,
    msgInput,
    newChatBtn,
    onboardingBack,
    onboardingChoices,
    onboardingContinue,
    onboardingModal,
    onboardingSkip,
    onboardingSubtitle,
    onboardingTitle,
    pinChatBtn,
    personaCloseBtn,
    personaDetailsInput,
    personaExampleDialoguesInput,
    personaExamplesField,
    personaForm,
    personaFormNotice,
    personaFormTitle,
    personaModal,
    personaNameInput,
    personaSection,
    personaPronounsInput,
    personaTypeSelect,
    personaAppearanceInput,
    personaBackgroundInput,
    popupCancelBtn,
    popupCloseBtn,
    popupConfirmBtn,
    popupDescription,
    popupEyebrow,
    popupField,
    popupInput,
    popupInputLabel,
    popupModal,
    popupTitle,
    renameChatBtn,
    roleplayCharacterSelect,
    roleplayNewPersonaBtn,
    roleplayScenarioInput,
    roleplayStarterBack,
    roleplayStarterCancel,
    roleplayStarterClose,
    roleplayStarterConfirm,
    roleplayStarterIntroCopy,
    roleplayStarterModal,
    roleplayStarterNotice,
    roleplayStarterStepOne,
    roleplayStarterStepTwo,
    roleplayStarterSuggestions,
    roleplayStarterTitle,
    roleplayUserPersonaSelect,
    sendBtn,
    saveGenerationSettingsBtn,
    brandLogoTargets,
    brandNameTargets,
    userPersonaList
} from "./js/dom.js?v=20260909-account-controls";

const headerModelButton = document.getElementById("headerModelButton");
const webSearchButton = document.getElementById("webSearch");
const webSearchToggle = createWebSearchToggle(webSearchButton);
const reasoningToggle = createReasoningToggle(document.getElementById("reasoning"));

let isProcessing = false, activeChatId = null, editingPersonaId = null, editingPersonaType = "assistant", currentUsername = "";
let regenerationChatId = null;
const attachmentComposer = createAttachmentComposer({ onChange: updateSendState, onError: message => setNotice(message, "error") });
let chatSessions = [], currentMessages = [], assistantPersonas = [], userPersonas = [];
let activeUserPersonaId = null, currentSummary = null, publishedPersonaIds = new Set();
let popupResolver = null, popupMode = null, popupLastFocus = null;
let roleplayPresetCharacterId = null;
let roleplayStarterStep = 1;
let workspaceMode = localStorage.getItem("krishd-workspace-mode") || "basic";
let onboardingStep = 1, onboardingIntent = "ask";
let chatLoadingDepth = 0;
let chatActivityDepth = 0;
let messageRetryState = new Map();
let availableModelsById = new Map();


function setNotice(message = "", state = "") {
    const notice = document.getElementById("workspaceNotice");
    if (notice) { notice.textContent = state === "error" ? message : ""; notice.classList.toggle("hidden", state !== "error"); }
    return { message, state };
}
function setPersonaFormNotice(message = "", state = "") {
    if (!personaFormNotice) return;
    if (!message) {
        personaFormNotice.textContent = "";
        personaFormNotice.className = "status hidden";
        return;
    }
    personaFormNotice.textContent = message;
    personaFormNotice.className = state ? `status ${state}` : "status";
}

function setChatLoading(active, message = "Loading chats...") {
    if (!chatListLoading || !chatListLoadingText) return;
    if (active) {
        chatLoadingDepth += 1;
        chatListLoadingText.textContent = message;
        chatListLoading.classList.remove("hidden");
        return;
    }
    chatLoadingDepth = Math.max(0, chatLoadingDepth - 1);
    if (chatLoadingDepth === 0) {
        chatListLoading.classList.add("hidden");
        chatListLoadingText.textContent = "Loading chats...";
    }
}

function setChatActivity(active, { eyebrow = "Please wait", title = "Preparing chat", detail = "The assistant is still working." } = {}) {
    if (!chatActivityOverlay || !chatActivityEyebrow || !chatActivityTitle || !chatActivityDetail) return;
    if (active) {
        chatActivityDepth += 1;
        chatActivityEyebrow.textContent = eyebrow;
        chatActivityTitle.textContent = title;
        chatActivityDetail.textContent = detail;
        chatActivityOverlay.classList.remove("hidden");
        return;
    }
    chatActivityDepth = Math.max(0, chatActivityDepth - 1);
    if (chatActivityDepth === 0) {
        chatActivityOverlay.classList.add("hidden");
        chatActivityEyebrow.textContent = "Please wait";
        chatActivityTitle.textContent = "Preparing chat";
        chatActivityDetail.textContent = "The assistant is still working.";
    }
}

function applyWorkspaceMode(nextMode, persist = true) {
    workspaceMode = nextMode === "advanced" ? "advanced" : "basic";
    document.body.dataset.workspaceMode = workspaceMode;
    if (persist) localStorage.setItem("krishd-workspace-mode", workspaceMode);
    if (modelSection) modelSection.classList.remove("hidden");
    if (personaSection) personaSection.classList.toggle("hidden", workspaceMode === "basic");
    updateComposerPlaceholder();
}

function isMobileLayout() {
    return window.matchMedia("(max-width: 980px)").matches;
}

function closeMobileSidebar() {
    if (!chatSidebar) return;
    document.body.classList.remove("sidebar-open");
    if (chatSidebarToggle) chatSidebarToggle.setAttribute("aria-expanded", "false");
}

function openMobileSidebar() {
    if (!chatSidebar) return;
    document.body.classList.add("sidebar-open");
    if (chatSidebarToggle) chatSidebarToggle.setAttribute("aria-expanded", "true");
}

function hasCompletedOnboarding() {
    return localStorage.getItem("krishd-onboarding-complete") === "true";
}

function markOnboardingCompleted() {
    localStorage.setItem("krishd-onboarding-complete", "true");
    closeOnboarding();
}

function closeOnboarding() {
    if (!onboardingModal) return;
    onboardingModal.classList.add("hidden");
}

function renderOnboardingStep() {
    if (!onboardingChoices || !onboardingTitle || !onboardingSubtitle) return;
    onboardingChoices.innerHTML = "";
    onboardingBack.classList.toggle("hidden", onboardingStep === 1);
    onboardingContinue.classList.toggle("hidden", onboardingStep === 2);
    if (onboardingStep === 1) {
        onboardingTitle.textContent = "Where shall we start?";
        onboardingSubtitle.textContent = "Ask a question, explore an idea, or step into a story.";
        [["ask", "Ask questions"], ["brainstorm", "Brainstorm ideas"], ["roleplay", "Roleplay with a character"]].forEach(([key, label]) => {
            const button = document.createElement("button");
            button.type = "button";
            button.className = `secondary-action${onboardingIntent === key ? " active" : ""}`;
            button.textContent = label;
            button.addEventListener("click", () => {
                onboardingIntent = key;
                renderOnboardingStep();
            });
            onboardingChoices.appendChild(button);
        });
        return;
    }
    onboardingTitle.textContent = "Choose a starter";
    onboardingSubtitle.textContent = "Pick one template and send your first message.";
    onboardingPrompts[onboardingIntent].forEach((template) => {
        const button = document.createElement("button");
        button.type = "button";
        button.className = "secondary-action";
        button.textContent = template;
        button.addEventListener("click", async () => {
            if (onboardingIntent === "roleplay") {
                closeOnboarding();
                if (assistantPersonas.length) {
                    openRoleplayStarter();
                } else {
                    openPersonaForm(null, "assistant");
                }
                return;
            }
            if (!activeChatId) await createNewChat();
            msgInput.value = template;
            msgInput.dispatchEvent(new Event("input"));
            msgInput.focus();
            closeOnboarding();
        });
        onboardingChoices.appendChild(button);
    });
}

function maybeShowOnboarding() {
    if (!onboardingModal || hasCompletedOnboarding()) return;
    onboardingStep = 1;
    onboardingIntent = "ask";
    renderOnboardingStep();
    onboardingModal.classList.remove("hidden");
}
function setMessageContent(el, content) {
    const markdownParser = window.marked;
    const purifier = window.DOMPurify;
    if (markdownParser?.parse && purifier?.sanitize) {
        el.innerHTML = purifier.sanitize(markdownParser.parse(content, { breaks: true }));
    } else {
        el.textContent = content;
    }
}
function getChatById(id) { return chatSessions.find((chat) => chat.id === id); }
function summarizeText(value, limit = 96) {
    const normalized = String(value || "").replace(/\s+/g, " ").trim();
    if (!normalized) return "";
    return normalized.length > limit ? `${normalized.slice(0, limit - 3).trimEnd()}...` : normalized;
}
function getPersonaName(id, items) {
    return items.find((persona) => persona.id === id)?.name || "";
}
function getRoleplayStarterSuggestions() {
    const assistantPersonaId = Number(roleplayCharacterSelect?.value);
    const userPersonaId = roleplayUserPersonaSelect?.value ? Number(roleplayUserPersonaSelect.value) : null;
    const assistantName = getPersonaName(assistantPersonaId, assistantPersonas) || "the character";
    const userName = userPersonaId ? getPersonaName(userPersonaId, userPersonas) : "me";
    return [
        `${assistantName} unexpectedly crosses paths with ${userName} in a place that matters to them both.`,
        `${assistantName} already knows something important about ${userName} and confronts them with it.`,
        `${assistantName} and ${userName} are forced to cooperate while something goes wrong around them.`,
        `${assistantName} meets ${userName} in a quiet, intimate scene with unresolved tension.`,
        `${assistantName} draws ${userName} into a high-stakes problem that starts immediately.`
    ];
}
function updateRoleplaySuggestions() {
    if (!roleplayStarterSuggestions) return;
    roleplayStarterSuggestions.innerHTML = "";
    getRoleplayStarterSuggestions().forEach((suggestion) => {
        const button = document.createElement("button");
        button.type = "button";
        button.className = "prompt-chip";
        button.textContent = suggestion;
        button.addEventListener("click", () => {
            if (roleplayScenarioInput) {
                roleplayScenarioInput.value = suggestion;
                roleplayScenarioInput.focus();
            }
        });
        roleplayStarterSuggestions.appendChild(button);
    });
}
function updateComposerPlaceholder() {
    const activeChat = getChatById(activeChatId);
    if (!activeChat) {
        msgInput.placeholder = "Create a chat to begin...";
        return;
    }
    if (activeChat.assistant_persona_id) {
        msgInput.placeholder = "Continue the scene...";
        return;
    }
    msgInput.placeholder = workspaceMode === "basic" ? "Ask anything..." : "Type your message...";
}

function updateSendState() {
    const hasText = Boolean(msgInput.value.trim());
    sendBtn.disabled = isProcessing ? false : attachmentComposer.pending || (!hasText && !attachmentComposer.attachments.length);
    sendBtn.setAttribute("aria-label", isProcessing ? "Stop generation" : "Send message");
}

function populateGenerationSettings(chat) {
    if (!chat) return;
    if (chat.preferred_model && Array.from(modelSelect.options).some((option) => option.value === chat.preferred_model)) {
        modelSelect.value = chat.preferred_model;
    }
    chatTemperatureInput.value = chat.temperature ?? "";
    chatContextLengthInput.value = chat.context_length ?? "";
    chatResponseLengthInput.value = chat.response_length ?? "";
    chatSystemInstructionInput.value = chat.system_instruction || "";
    renderModelSection();
}

async function saveGenerationSettings() {
    if (!activeChatId) return;
    const payload = {
        preferredModel: modelSelect.value || null,
        temperature: chatTemperatureInput.value,
        contextLength: chatContextLengthInput.value,
        responseLength: chatResponseLengthInput.value,
        systemInstruction: chatSystemInstructionInput.value
    };
    const res = await put(`/chats/${activeChatId}/generation-settings`, payload);
    if (res.error || !res.chat) return setNotice(res.error || "Unable to save generation settings.", "error");
    const chat = getChatById(activeChatId);
    if (chat) Object.assign(chat, res.chat);
    populateGenerationSettings(res.chat);
    setNotice("Generation settings saved.", "success");
}

async function saveSelectedModel() {
    if (!activeChatId || !modelSelect.value) return;
    const chatId = activeChatId;
    const selectedModel = modelSelect.value;
    const res = await put(`/chats/${chatId}/model`, { model: selectedModel });
    if (res.error || !res.chat) return setNotice(res.error || "Unable to switch models.", "error");
    const chat = getChatById(chatId);
    if (chat) Object.assign(chat, res.chat);
    if (chatId === activeChatId && modelSelect.value === selectedModel) {
        renderModelSection();
        setNotice(`Model switched to ${modelSelect.selectedOptions[0]?.textContent || selectedModel}.`, "success");
    }
}

function resizeComposerInput() {
    msgInput.style.height = "auto";
    const nextHeight = Math.min(Math.max(msgInput.scrollHeight, 46), 96);
    msgInput.style.height = `${nextHeight}px`;
}

function scrollMessagesToBottom() {
    requestAnimationFrame(() => {
        messagesDiv.scrollTop = messagesDiv.scrollHeight;
    });
}

function getNewestMessage() {
    return currentMessages.length ? currentMessages[currentMessages.length - 1] : null;
}

function getMessageIndexById(messageId) {
    return currentMessages.findIndex((message) => message.id === messageId);
}

async function resolveMessageTarget(messageId, fallbackIndex = -1) {
    if (messageId) {
        const index = getMessageIndexById(messageId);
        if (index >= 0) {
            return { index, message: currentMessages[index] };
        }
    }
    if (activeChatId) {
        await setActiveChat(activeChatId);
    }
    if (messageId) {
        const index = getMessageIndexById(messageId);
        if (index >= 0) {
            return { index, message: currentMessages[index] };
        }
    }
    if (fallbackIndex >= 0 && fallbackIndex < currentMessages.length) {
        return { index: fallbackIndex, message: currentMessages[fallbackIndex] };
    }
    return null;
}

function getMessageEndpoint(target, suffix = "") {
    if (!activeChatId || !target) return "";
    if (target.message?.id) return `/chats/${activeChatId}/messages/${target.message.id}${suffix}`;
    if (target.index >= 0) return `/chats/${activeChatId}/messages/by-index/${target.index}${suffix}`;
    return "";
}

function getPreviousUserMessageId(messageId) {
    const index = getMessageIndexById(messageId);
    if (index <= 0) return null;
    for (let i = index - 1; i >= 0; i -= 1) {
        if (currentMessages[i].role === "user" && currentMessages[i].id) {
            return currentMessages[i].id;
        }
    }
    return null;
}

function getRetryStateFromMessage(message) {
    const variants = Array.isArray(message?.retryVariants) && message.retryVariants.length
        ? [...message.retryVariants]
        : [message?.content || ""];
    const requestedActiveIndex = Number(message?.retryActiveIndex);
    const activeIndex = Number.isInteger(requestedActiveIndex)
        ? Math.min(Math.max(requestedActiveIndex, 0), variants.length - 1)
        : 0;
    return {
        variants,
        activeIndex,
        retriesUsed: Number(message?.retryRetriesUsed || 0),
        promptMessageId: message?.retryPromptMessageId ?? getPreviousUserMessageId(message?.id)
    };
}

function syncRetryStateFromMessage(message) {
    if (!message?.id) return null;
    const state = getRetryStateFromMessage(message);
    messageRetryState.set(message.id, state);
    return state;
}

function ensureRetryState(message) {
    if (!message?.id) return null;
    let state = messageRetryState.get(message.id);
    if (!state) {
        state = syncRetryStateFromMessage(message);
    }
    return state;
}

async function openCreatedChat(chat) {
    if (!chat?.id) throw new Error("The server did not return the newly created chat");
    if (chatSearchInput) chatSearchInput.value = "";
    const chatsResponse = await get("/chats");
    if (chatsResponse.error) throw new Error(chatsResponse.error);
    chatSessions = chatsResponse.chats || [];
    if (!chatSessions.some((item) => item.id === chat.id)) {
        throw new Error("The newly created chat was not persisted");
    }
    renderChatList();
    await setActiveChat(chat.id);
}

async function editChatMessage(messageId, fallbackIndex = -1) {
    const target = await resolveMessageTarget(messageId, fallbackIndex);
    if (!target) return setNotice("Message is not ready yet. Try again.", "error");
    const { index, message } = target;
    const nextContent = await promptPopup({
        eyebrow: message.role === "user" ? "Your message" : "Assistant message",
        title: "Edit message",
        description: "Update this message.",
        label: "Message",
        value: message.content,
        confirmLabel: "Save"
    });
    const content = (nextContent || "").trim();
    if (!content) return;
    if (message.role === "user") {
        const confirmed = await confirmPopup({
            eyebrow: "Create branch",
            title: "Create an edited chat branch?",
            description: "This creates a new chat from the messages before this one and sends your edited message there. The original chat stays unchanged.",
            confirmLabel: "Create branch"
        });
        if (!confirmed) return;
        const sourceChatId = activeChatId;
        setLoadingState(true, {
            eyebrow: "Branching",
            title: "Editing and resending",
            detail: "Creating and opening a new chat branch."
        });
        try {
            const res = await post(`/chats/${sourceChatId}/messages/${message.id}/edit-resend`, {
                chatId: sourceChatId,
                message: content,
                model: modelSelect.value,
                confirmed: true
            });
            if (res.error) return setNotice(res.error, "error");
            await openCreatedChat(res.chat);
            return setNotice("Created and opened the edited chat branch.", "success");
        } finally {
            setLoadingState(false);
        }
    }
    const endpoint = getMessageEndpoint(target);
    if (!endpoint) return setNotice("Message is not ready yet. Try again.", "error");
    const res = await put(endpoint, { content });
    if (res.error || !res.message) {
        return setNotice(res.error || "Unable to edit message.", "error");
    }
    currentMessages[index] = { ...currentMessages[index], ...res.message };
    syncRetryStateFromMessage(currentMessages[index]);
    renderMessages();
    setNotice("Message updated.", "success");
}

async function deleteChatMessage(messageId, fallbackIndex = -1) {
    const target = await resolveMessageTarget(messageId, fallbackIndex);
    if (!target) return setNotice("Message is not ready yet. Try again.", "error");
    const { index, message } = target;
    const confirmed = await confirmPopup({
        eyebrow: message.role === "user" ? "Your message" : "Assistant message",
        title: "Delete message",
        description: "Delete this message from the chat?",
        confirmLabel: "Delete",
        danger: true
    });
    if (!confirmed) return;
    const endpoint = getMessageEndpoint(target);
    if (!endpoint) return setNotice("Message is not ready yet. Try again.", "error");
    const res = await del(endpoint);
    if (res.error) return setNotice(res.error, "error");
    currentMessages = currentMessages.filter((item) => item.id !== message.id);
    if (message.id) {
        messageRetryState.delete(message.id);
        for (const [key, state] of messageRetryState.entries()) {
            if (state.promptMessageId === message.id) {
                messageRetryState.delete(key);
            }
        }
    }
    renderMessages();
    await loadSummary();
    setNotice("Message deleted.", "success");
}

async function retryLatestAssistantMessage(messageId, fallbackIndex = -1) {
    if (isProcessing) return;
    const target = await resolveMessageTarget(messageId, fallbackIndex);
    if (isProcessing) return;
    if (!target) return setNotice("Message is not ready yet. Try again.", "error");
    if (target.message.role !== "bot") return setNotice("Only assistant messages can be regenerated.", "error");
    const retriesUsed = Math.max(0, Number(target.message.versionCount || 1) - 1);
    if (retriesUsed >= 5) {
        return setNotice("Retry limit reached (5).", "error");
    }
    const chatId = activeChatId;
    const card = messagesDiv.querySelector(`[data-message-id="${target.message.id}"]`);
    if (!card) return;
    const payload = { model: modelSelect.value, webSearch: webSearchToggle.enabled, reasoning: reasoningToggle.enabled };
    regenerationChatId = chatId;
    setLoadingState(true, false);
    try {
        await regenerateInline({
            card, scroller: messagesDiv, endpoint: `/chats/${chatId}/messages/${target.message.id}/retry/stream`, payload,
            renderContent: setMessageContent,
            complete: message => {
                if (activeChatId !== chatId) return;
                const index = getMessageIndexById(message.id);
                if (index < 0) return;
                currentMessages[index] = { ...currentMessages[index], ...message, thinking: message.thinking, sources: message.sources };
                syncRetryStateFromMessage(currentMessages[index]);
                const rendered = addMessage(currentMessages[index], false, false, { messageIndex: index, detached: true });
                card.replaceChildren(...rendered.childNodes);
            }
        });
        webSearchToggle.reset();
        reasoningToggle.reset();
        setNotice("Reply regenerated.", "success");
    } catch (error) {
        setNotice(error.message || "Unable to regenerate message.", "error");
    } finally {
        regenerationChatId = null;
        setLoadingState(false);
    }
}

async function switchResponseVersion(messageId, direction, fallbackIndex = -1) {
    const target = await resolveMessageTarget(messageId, fallbackIndex);
    if (!target) return setNotice("Message is not ready yet. Try again.", "error");
    if (Number(target.message.versionCount) > 1) {
        const chatId = activeChatId;
        const card = messagesDiv.querySelector(`[data-message-id="${messageId}"]`);
        if (!card || card.getAttribute("aria-busy") === "true") return;
        const buttons = [...card.querySelectorAll("button")].map(button => [button, button.disabled]);
        card.setAttribute("aria-busy", "true");
        buttons.forEach(([button]) => { button.disabled = true; });
        try {
            const res = await post(`/chats/${chatId}/messages/${messageId}/versions/${target.message.versionIndex + direction}`, {});
            if (res.error) return setNotice(res.error, "error");
            if (activeChatId !== chatId) return;
            const index = getMessageIndexById(messageId);
            if (index < 0) return;
            currentMessages[index] = { ...currentMessages[index], ...res.message, thinking: res.message.thinking, sources: res.message.sources };
            syncRetryStateFromMessage(currentMessages[index]);
            const rendered = addMessage(currentMessages[index], false, false, { messageIndex: index, detached: true });
            card.replaceChildren(...rendered.childNodes);
        } finally {
            card.removeAttribute("aria-busy");
            buttons.forEach(([button, disabled]) => { button.disabled = disabled; });
        }
    }
}

async function switchRetryVariant(messageId, direction, fallbackIndex = -1) {
    const target = await resolveMessageTarget(messageId, fallbackIndex);
    if (!target) return setNotice("Message is not ready yet. Try again.", "error");
    const siblingId = direction < 0 ? target.message.previousSiblingId : target.message.nextSiblingId;
    if (!siblingId) return;
    const res = await post(`/chats/${activeChatId}/branches/${siblingId}/activate`, { includeDescendants: true });
    if (res.error) return setNotice(res.error, "error");
    currentMessages = res.messages || [];
    renderMessages();
}

async function branchFromMessage(messageId) {
    if (!activeChatId || !messageId) return;
    const confirmed = await confirmPopup({
        eyebrow: "Create branch",
        title: "Create a new chat branch?",
        description: "The new chat will contain the conversation through this message. The original chat stays unchanged.",
        confirmLabel: "Create branch"
    });
    if (!confirmed) return;
    const sourceChatId = activeChatId;
    const res = await post(`/chats/${sourceChatId}/messages/${messageId}/branch`, { confirmed: true });
    if (res.error) return setNotice(res.error, "error");
    await openCreatedChat(res.chat);
    msgInput.focus();
    setNotice("Created and opened a new chat branch.", "success");
}

function addMessage(contentOrMessage, isUser = false, isLoading = false, options = {}) {
    const msgDiv = document.createElement("div");
    msgDiv.className = `msg ${isUser ? "user" : "bot"}${isLoading ? " loading" : ""}`;
    msgDiv.setAttribute("role", "article");
    msgDiv.tabIndex = 0;
    if (isLoading) {
        msgDiv.setAttribute("aria-label", "Assistant is responding");
        msgDiv.innerHTML = `
            <div class="msg-header">Assistant</div>
            <div class="loading-shell" aria-live="polite" aria-label="Assistant is responding">
                <div class="loading-bars">
                    <span class="loading-bar"></span>
                    <span class="loading-bar"></span>
                    <span class="loading-bar"></span>
                    <span class="loading-bar"></span>
                </div>
                <div class="loading-copy">
                    <strong>Thinking</strong>
                </div>
            </div>
            <div class="msg-content streaming-content"></div>`;
    } else {
        const message = typeof contentOrMessage === "object" && contentOrMessage
            ? contentOrMessage
            : { id: null, role: isUser ? "user" : "bot", content: String(contentOrMessage || "") };
        const isMessageUser = message.role === "user";
        msgDiv.dataset.messageId = message.id;
        msgDiv.className = `msg ${isMessageUser ? "user" : "bot"}`;
        msgDiv.setAttribute("aria-label", isMessageUser ? "Your message" : "Assistant message");
        const header = document.createElement("div"), body = document.createElement("div"), actions = document.createElement("div");
        header.className = "msg-header"; body.className = "msg-content";
        actions.className = "msg-actions";
        actions.setAttribute("aria-label", "Message actions");
        const activeChat = getChatById(activeChatId);
        header.textContent = isMessageUser ? "You" : (activeChat?.assistant_persona_name || "Assistant");
        setMessageContent(body, message.content);

        const editBtn = document.createElement("button");
        editBtn.type = "button";
        editBtn.className = "msg-action-btn";
        editBtn.textContent = isMessageUser ? "Edit & resend" : "Edit";
        editBtn.setAttribute("aria-label", `Edit ${isMessageUser ? "your" : "assistant"} message`);
        editBtn.addEventListener("click", () => {
            void editChatMessage(message.id, options.messageIndex ?? -1);
        });
        actions.appendChild(editBtn);

        const deleteBtn = document.createElement("button");
        deleteBtn.type = "button";
        deleteBtn.className = "msg-action-btn";
        deleteBtn.textContent = "Delete";
        deleteBtn.setAttribute("aria-label", `Delete ${isMessageUser ? "your" : "assistant"} message`);
        deleteBtn.addEventListener("click", () => {
            void deleteChatMessage(message.id, options.messageIndex ?? -1);
        });
        actions.appendChild(deleteBtn);

        const branchBtn = document.createElement("button");
        branchBtn.type = "button";
        branchBtn.className = "msg-action-btn";
        branchBtn.textContent = "Branch here";
        branchBtn.addEventListener("click", () => { void branchFromMessage(message.id); });
        actions.appendChild(branchBtn);

        if (message.role === "bot") {
            const retriesUsed = Math.max(0, Number(message.versionCount || 1) - 1);
            const retryBtn = document.createElement("button");
            retryBtn.type = "button";
            retryBtn.className = "msg-action-btn";
            retryBtn.dataset.messageAction = "regenerate";
            retryBtn.dataset.retryLimitReached = String(retriesUsed >= 5);
            retryBtn.textContent = `Regenerate (${retriesUsed}/5)`;
            retryBtn.setAttribute("aria-label", `Regenerate assistant message, ${retriesUsed} of 5 retries used`);
            retryBtn.disabled = retriesUsed >= 5 || isProcessing;
            retryBtn.addEventListener("click", () => {
                void retryLatestAssistantMessage(message.id, options.messageIndex ?? -1);
            });
            actions.appendChild(retryBtn);
        }

        for (const versioned of [true, false]) {
            if (Number((versioned ? message.versionCount : message.siblingCount) || 1) <= 1) continue;
            const navigate = versioned ? switchResponseVersion : switchRetryVariant;
            const prevBtn = document.createElement("button");
            prevBtn.type = "button";
            prevBtn.className = "msg-action-btn";
            prevBtn.textContent = "Prev";
            prevBtn.setAttribute("aria-label", versioned ? "Show previous response version" : "Show previous branch");
            prevBtn.disabled = versioned ? message.versionIndex <= 0 : !message.previousSiblingId;
            prevBtn.addEventListener("click", () => {
                void navigate(message.id, -1, options.messageIndex ?? -1);
            });

            const nextBtn = document.createElement("button");
            nextBtn.type = "button";
            nextBtn.className = "msg-action-btn";
            nextBtn.textContent = "Next";
            nextBtn.setAttribute("aria-label", versioned ? "Show next response version" : "Show next branch");
            nextBtn.disabled = versioned ? message.versionIndex >= message.versionCount - 1 : !message.nextSiblingId;
            nextBtn.addEventListener("click", () => {
                void navigate(message.id, 1, options.messageIndex ?? -1);
            });

            const indexBadge = document.createElement("span");
            indexBadge.className = "msg-variant-index";
            indexBadge.textContent = versioned ? `${message.versionIndex + 1} / ${message.versionCount}` : `${Number(message.siblingIndex || 0) + 1}/${message.siblingCount}`;
            actions.append(prevBtn, indexBadge, nextBtn);
        }

        msgDiv.append(header);
        appendAttachments(msgDiv, message.attachments);
        msgDiv.append(body);
        if (!isMessageUser) updateReasoning(msgDiv, message.thinking);
        if (!isMessageUser) appendSources(msgDiv, message.sources);
        if (message.deliveryStatus === "failed" && message.errorMessage) {
            const error = document.createElement("p");
            error.className = "status";
            error.textContent = message.errorMessage;
            msgDiv.appendChild(error);
        }
        if (actions.childElementCount) {
            msgDiv.appendChild(actions);
        }
    }
    if (!options.detached) {
        messagesDiv.appendChild(msgDiv);
        scrollMessagesToBottom();
    }
    return msgDiv;
}

function renderMessages() {
    messagesDiv.innerHTML = "";
    const chat = getChatById(activeChatId);
    if (!currentMessages.length && (!chat || chat.assistant_persona_id)) {
        renderMessageEmptyState();
    } else {
        currentMessages.forEach((msg, index) => addMessage(msg, msg.role === "user", false, {
            messageIndex: index,
            isNewest: index === currentMessages.length - 1
        }));
    }
    renderDrawerSummary();
    updateChatActionState();
    updateComposerPlaceholder();
    if (currentMessages.length) {
        scrollMessagesToBottom();
    }
}

function createStarterAction(label, className, handler) {
    const button = document.createElement("button");
    button.type = "button";
    button.className = className;
    button.textContent = label;
    button.addEventListener("click", handler);
    return button;
}

function createMessageStarterPrompt(label, prompt) {
    return createStarterAction(label, "secondary-action", async () => {
        if (!activeChatId) await createNewChat();
        msgInput.value = prompt;
        msgInput.dispatchEvent(new Event("input"));
        msgInput.focus();
    });
}

function renderMessageEmptyState() {
    const empty = document.createElement("section");
    const title = document.createElement("h3");
    const description = document.createElement("p");
    const actions = document.createElement("div");
    const chat = getChatById(activeChatId);

    empty.className = "messages-empty";
    title.className = "messages-empty-title";
    description.className = "messages-empty-copy";
    actions.className = "messages-empty-actions";

    if (!chat) {
        title.textContent = "Where shall we start?";
        description.textContent = "Choose a starting point.";
        actions.append(
            createStarterAction("New chat", "primary-action", () => { void createNewChat(); }),
            createStarterAction("Roleplay", "secondary-action", () => {
                if (assistantPersonas.length) {
                    openRoleplayStarter();
                    return;
                }
                openPersonaForm(null, "assistant");
            }),
            createMessageStarterPrompt("Try a prompt", "Help me plan my day in 3 steps.")
        );
    } else if (chat.assistant_persona_id) {
        title.textContent = "Roleplay is ready";
        description.textContent = "Send a line or pick a prompt.";
        actions.append(
            createMessageStarterPrompt("Add tension", "Open with a tense line that raises the stakes immediately."),
            createMessageStarterPrompt("Set the scene", "Describe what your character notices first in this scene."),
            createStarterAction("Change setup", "secondary-action", () => openRoleplayStarter())
        );
    } else {
        title.textContent = "What can I help with?";
        description.textContent = "Write a message below or start with one of these prompts.";
        actions.append(
            createMessageStarterPrompt("Explain something", "Explain this topic in simple terms: "),
            createMessageStarterPrompt("Plan a task", "Help me make a practical step-by-step plan for: "),
            createMessageStarterPrompt("Brainstorm ideas", "Give me several creative ideas for: ")
        );
    }

    empty.append(title, description, actions);
    messagesDiv.appendChild(empty);
}

function updateWorkspaceCopy() {
    const activeChat = getChatById(activeChatId);
    if (activeChatTitle) {
        activeChatTitle.textContent = activeChat ? activeChat.title : "New chat";
    }

    renderDrawerSummary();
    updateComposerPlaceholder();
}

function setRoleplayStarterNotice(message = "", state = "") {
    if (!roleplayStarterNotice) return;
    if (!message) {
        roleplayStarterNotice.textContent = "";
        roleplayStarterNotice.className = "status hidden";
        return;
    }
    roleplayStarterNotice.textContent = message;
    roleplayStarterNotice.className = state ? `status ${state}` : "status";
}

function renderRoleplayStarterStep() {
    const isSceneStep = roleplayStarterStep === 2;
    if (roleplayStarterStepOne) roleplayStarterStepOne.classList.toggle("hidden", isSceneStep);
    if (roleplayStarterStepTwo) roleplayStarterStepTwo.classList.toggle("hidden", !isSceneStep);
    if (roleplayStarterBack) roleplayStarterBack.classList.toggle("hidden", !isSceneStep);
    if (roleplayStarterTitle) {
        roleplayStarterTitle.textContent = isSceneStep ? "Shape the opening scene" : "Choose your roleplay";
    }
    if (roleplayStarterIntroCopy) {
        roleplayStarterIntroCopy.textContent = isSceneStep
            ? "Add an optional custom scenario. If you leave it empty, the AI Character will invent its own opening scene."
            : "Pick a character and choose who you are before moving on to the opening scene.";
    }
    if (roleplayStarterCancel) {
        roleplayStarterCancel.textContent = isSceneStep ? "Close" : "Cancel";
    }
    if (roleplayStarterConfirm) {
        roleplayStarterConfirm.textContent = isSceneStep ? "Start roleplay" : "Continue";
    }
}

function renderDrawerSummary() {
    const chat = getChatById(activeChatId);
    if (!chatCharacterPill || !chatUserPersonaPill) return;
    if (!chat) {
        chatCharacterPill.classList.add("hidden");
        chatUserPersonaPill.classList.add("hidden");
        return;
    }
    if (chat.assistant_persona_id) {
        chatCharacterPill.textContent = `Character: ${chat.assistant_persona_name || chat.title}`;
        chatCharacterPill.classList.remove("hidden");
        if (chat.user_persona_id) {
            chatUserPersonaPill.textContent = `You as: ${chat.user_persona_name || "User persona"}`;
            chatUserPersonaPill.classList.remove("hidden");
        } else {
            chatUserPersonaPill.textContent = "You as: yourself";
            chatUserPersonaPill.classList.remove("hidden");
        }
        return;
    }
    chatCharacterPill.classList.add("hidden");
    chatUserPersonaPill.classList.add("hidden");
}

function renderModelSection() {
    reasoningToggle.setModel(modelSelect.value);
    updateModelHelp();
    return modelSelect?.selectedOptions[0]?.textContent || "";
}

function updateModelHelp() {
    if (!modelSelect || !modelHelpTitle || !modelHelpBadge || !modelHelpSummary) return;
    const selectedOption = modelSelect.selectedOptions[0];
    if (!selectedOption || selectedOption.disabled) {
        if (modelCount) modelCount.textContent = "No models";
        if (modelBadgeName) modelBadgeName.textContent = "Unavailable";
        if (headerModelName) headerModelName.textContent = "Unavailable";
        modelHelpBadge.dataset.badge = "waiting";
        modelHelpTitle.textContent = "Choose a model";
        modelHelpBadge.textContent = "Waiting";
        modelHelpSummary.textContent = "Pick a model to see what it is best suited for.";
        return;
    }
    if (modelCount) {
        const totalModels = Array.from(modelSelect.options).filter((option) => !option.disabled).length;
        modelCount.textContent = `${totalModels} ${totalModels === 1 ? "model" : "models"}`;
    }
    const modelId = selectedOption.value;
    const modelName = selectedOption.textContent || modelId;
    const profile = getModelProfile(availableModelsById.get(modelId) || { model: modelId, name: modelName });
    if (modelBadgeName) modelBadgeName.textContent = modelName;
    if (headerModelName) headerModelName.textContent = modelName;
    modelHelpTitle.textContent = modelName;
    modelHelpBadge.textContent = profile.badge;
    modelHelpBadge.dataset.badge = profile.badge.toLowerCase();
    modelHelpSummary.textContent = profile.summary;
}

function applyTheme(themeKey, persist = true) {
    applySharedTheme(themeKey, {
        persist,
        title: "Elsewhere",
        nameTargets: brandNameTargets,
        logoTargets: brandLogoTargets
    });
    updateWorkspaceCopy();
    renderModelSection();
}

function applyThemeMode(modeKey, persist = true) {
    applySharedThemeMode(modeKey, { persist });
}

function updateChatActionState() {
    const activeChat = getChatById(activeChatId);
    const hasChat = Boolean(activeChat);
    renameChatBtn.disabled = !hasChat || Boolean(activeChat?.assistant_persona_id);
    if (pinChatBtn) {
        pinChatBtn.disabled = !hasChat;
        if (hasChat) pinChatBtn.textContent = activeChat.is_pinned ? "Unpin" : "Pin";
    }
    if (moveChatFolderBtn) moveChatFolderBtn.disabled = !hasChat;
    if (manageChatMemoryBtn) manageChatMemoryBtn.disabled = !hasChat;
    if (managePersonaStateBtn) managePersonaStateBtn.disabled = !hasChat || !activeChat?.assistant_persona_id;
    if (archiveChatBtn) {
        archiveChatBtn.disabled = !hasChat;
        if (hasChat) archiveChatBtn.textContent = activeChat.archived_at ? "Unarchive" : "Archive";
    }
    clearChatBtn.disabled = !hasChat;
    exportChatBtn.disabled = !hasChat || currentMessages.length === 0;
    if (backupWorkspaceBtn) backupWorkspaceBtn.disabled = !currentUsername;
    if (importWorkspaceBtn) importWorkspaceBtn.disabled = !currentUsername;
    if (headerModelButton) headerModelButton.disabled = !hasChat;
}

function openModelSettings() {
    if (!activeChatId || !modelSection) return;
    modelSection.classList.remove("hidden");
    modelSection.open = true;
    openChatDrawer();
    requestAnimationFrame(() => modelSelect?.focus());
}

function renderPersonaSection() {
    updateActivePersonaStatus(userPersonas, activeUserPersonaId, activeUserPersonaStatus, "No default user persona set.", "Default user persona");
    if (chatDrawerPersonaValue) {
        const active = userPersonas.find((persona) => persona.id === activeUserPersonaId);
        chatDrawerPersonaValue.textContent = active ? active.name : "None";
        if (headerPersonaName) headerPersonaName.textContent = active ? active.name : "None";
    }
    if (clearUserPersonaBtn) clearUserPersonaBtn.disabled = !activeUserPersonaId;
}

function maybeShowPersonaNudge() {
    if (localStorage.getItem("krishd-persona-nudge-shown") === "true") return;
    const assistantOnlyChats = chatSessions.filter((chat) => !chat.assistant_persona_id).length;
    if (assistantOnlyChats < 3) return;
    localStorage.setItem("krishd-persona-nudge-shown", "true");
    setNotice("Want to personalize responses? Try personas in Tools.", "success");
}

function renderChatList() {
    const query = chatSearchInput.value.trim().toLowerCase();
    const filtered = chatSessions.filter((chat) => !query
        || chat.title.toLowerCase().includes(query)
        || String(chat.matched_content || "").toLowerCase().includes(query));
    chatList.innerHTML = "";
    if (!filtered.length) {
        const empty = document.createElement("p");
        empty.className = "status";
        empty.textContent = query ? "No chats match this search." : "No chats yet. Start a new one.";
        chatList.appendChild(empty);
        return;
    }
    const folderGroups = filtered
        .filter((chat) => chat.folder_name && !chat.archived_at)
        .reduce((map, chat) => {
            const key = String(chat.folder_name).trim();
            const items = map.get(key) || [];
            items.push(chat);
            map.set(key, items);
            return map;
        }, new Map());
    const groups = [
        { label: "Pinned", items: filtered.filter((chat) => chat.is_pinned && !chat.archived_at) },
        ...Array.from(folderGroups.entries()).map(([label, items]) => ({ label, items })),
        { label: "Recent", items: filtered.filter((chat) => !chat.is_pinned && !chat.folder_name && !chat.archived_at) },
        { label: "Archived", items: filtered.filter((chat) => chat.archived_at) }
    ].filter((group) => group.items.length);
    groups.forEach((group) => {
        const section = document.createElement("section");
        const heading = document.createElement("div");
        const list = document.createElement("div");
        section.className = "chat-list-section";
        heading.className = "chat-list-section-header";
        heading.textContent = group.label;
        list.className = "chat-list-section-body";
        list.setAttribute("role", "list");
        section.append(heading, list);
        group.items.forEach((chat) => {
            const item = document.createElement("div"), content = document.createElement("div"), title = document.createElement("span"), meta = document.createElement("small"), remove = document.createElement("button");
            item.className = `chat-item${chat.id === activeChatId ? " active" : ""}`;
            item.setAttribute("role", "button");
            item.tabIndex = 0;
            item.setAttribute("aria-label", `Open chat ${chat.title}`);
            if (chat.id === activeChatId) item.setAttribute("aria-current", "page");
            content.className = "chat-item-copy";
            title.textContent = chat.title;
            meta.className = "chat-item-meta";
            const chatType = chat.assistant_persona_id
                ? `Roleplay${chat.user_persona_name ? ` · ${chat.user_persona_name}` : ""}`
                : "Assistant chat";
            meta.textContent = chat.source_chat_id ? `Branch · ${chatType}` : chatType;
            remove.type = "button";
            remove.className = "chat-item-delete";
            remove.textContent = "Delete";
            remove.setAttribute("aria-label", `Delete chat ${chat.title}`);
            remove.addEventListener("click", async (event) => {
                event.stopPropagation();
                await deleteChat(chat.id);
            });
            content.append(title, meta);
            item.append(content, remove);
            item.addEventListener("click", () => {
                closeMobileSidebar();
                setActiveChat(chat.id);
            });
            item.addEventListener("keydown", (event) => {
                if (event.key !== "Enter" && event.key !== " ") return;
                event.preventDefault();
                closeMobileSidebar();
                void setActiveChat(chat.id);
            });
            list.appendChild(item);
        });
        chatList.appendChild(section);
    });
}

function updateActivePersonaStatus(items, activeId, statusEl, emptyText, prefix) {
    if (!statusEl) return;
    const active = items.find((persona) => persona.id === activeId);
    statusEl.textContent = active ? `${prefix}: ${active.name}` : emptyText;
}

function openPersonaForm(persona = null, personaType = "assistant") {
    closeChatDrawer();
    closePopup(false);
    personaModal.classList.remove("hidden");
    if (persona) {
        editingPersonaId = persona.id; editingPersonaType = persona.persona_type || "assistant";
        personaFormTitle.textContent = `Edit ${editingPersonaType === "user" ? "your persona" : "AI Character"}`;
        personaTypeSelect.value = editingPersonaType; personaTypeSelect.disabled = true;
        personaNameInput.value = persona.name || ""; personaPronounsInput.value = persona.pronouns || "";
        personaAppearanceInput.value = persona.appearance || ""; personaBackgroundInput.value = persona.background || ""; personaDetailsInput.value = persona.details || "";
        personaExampleDialoguesInput.value = persona.example_dialogues || "";
    } else {
        editingPersonaId = null; editingPersonaType = personaType;
        personaFormTitle.textContent = `Create ${personaType === "user" ? "your persona" : "AI Character"}`;
        personaTypeSelect.value = personaType; personaTypeSelect.disabled = false;
        personaNameInput.value = ""; personaPronounsInput.value = ""; personaAppearanceInput.value = ""; personaBackgroundInput.value = ""; personaDetailsInput.value = "";
        personaExampleDialoguesInput.value = "";
    }
    personaExamplesField.classList.toggle("hidden", personaTypeSelect.value !== "assistant");
    setPersonaFormNotice("");
    personaNameInput.focus();
}

function closePersonaForm() { personaModal.classList.add("hidden"); editingPersonaId = null; editingPersonaType = "assistant"; personaTypeSelect.disabled = false; setPersonaFormNotice(""); }
function populateRoleplayStarter() {
    if (!roleplayCharacterSelect || !roleplayUserPersonaSelect) return;
    roleplayCharacterSelect.innerHTML = "";
    const placeholder = document.createElement("option");
    placeholder.value = "";
    placeholder.textContent = "Choose AI Character";
    placeholder.disabled = true;
    placeholder.selected = true;
    roleplayCharacterSelect.appendChild(placeholder);
    assistantPersonas.forEach((persona) => {
        const option = document.createElement("option");
        option.value = String(persona.id);
        option.textContent = persona.name;
        option.selected = persona.id === roleplayPresetCharacterId;
        roleplayCharacterSelect.appendChild(option);
    });
    if (roleplayPresetCharacterId) {
        roleplayCharacterSelect.value = String(roleplayPresetCharacterId);
    }
    roleplayUserPersonaSelect.innerHTML = "";
    const noneOption = document.createElement("option");
    noneOption.value = "";
    noneOption.textContent = "Myself (no user persona)";
    roleplayUserPersonaSelect.appendChild(noneOption);
    userPersonas.forEach((persona) => {
        const option = document.createElement("option");
        option.value = String(persona.id);
        option.textContent = persona.name;
        option.selected = persona.id === activeUserPersonaId;
        roleplayUserPersonaSelect.appendChild(option);
    });
    if (assistantPersonas.length === 0) {
        setRoleplayStarterNotice("Create an AI Character first, then start roleplay.", "error");
        roleplayStarterConfirm.disabled = true;
    } else {
        setRoleplayStarterNotice("");
        roleplayStarterConfirm.disabled = false;
    }
    updateRoleplaySuggestions();
    renderRoleplayStarterStep();
}
function openRoleplayStarter(characterId = null) {
    closeChatDrawer();
    roleplayPresetCharacterId = characterId;
    roleplayStarterStep = 1;
    populateRoleplayStarter();
    if (roleplayScenarioInput) roleplayScenarioInput.value = "";
    setRoleplayStarterNotice("");
    roleplayStarterModal.classList.remove("hidden");
    if (roleplayCharacterSelect.options.length) roleplayCharacterSelect.focus();
}
function closeRoleplayStarter() {
    if (!roleplayStarterModal) return;
    roleplayStarterModal.classList.add("hidden");
    roleplayPresetCharacterId = null;
    roleplayStarterStep = 1;
    roleplayStarterConfirm.disabled = false;
    if (roleplayScenarioInput) roleplayScenarioInput.value = "";
    setRoleplayStarterNotice("");
    renderRoleplayStarterStep();
}

function goToRoleplayStarterSceneStep() {
    if (!assistantPersonas.length) {
        return setRoleplayStarterNotice("Create an AI Character first, then start roleplay.", "error");
    }
    if (!roleplayCharacterSelect.value) {
        return setRoleplayStarterNotice("Choose a character to continue.", "error");
    }
    roleplayStarterStep = 2;
    setRoleplayStarterNotice("");
    renderRoleplayStarterStep();
    if (roleplayScenarioInput) roleplayScenarioInput.focus();
}
function isPopupOpen() { return popupModal && !popupModal.classList.contains("hidden"); }
function finishPopup(result) {
    if (typeof popupResolver === "function") popupResolver(result);
    popupResolver = null;
    popupMode = null;
}
function closePopup(resolveValue = null) {
    if (!popupModal || popupModal.classList.contains("hidden")) return;
    popupModal.classList.add("hidden");
    popupField.classList.add("hidden");
    popupInput.value = "";
    popupConfirmBtn.disabled = false;
    const nextFocus = popupLastFocus;
    popupLastFocus = null;
    finishPopup(resolveValue);
    if (nextFocus instanceof HTMLElement) nextFocus.focus();
}
function openPopup(options) {
    if (!popupModal) return Promise.resolve(null);
    if (isPopupOpen()) closePopup(null);
    popupLastFocus = document.activeElement instanceof HTMLElement ? document.activeElement : null;
    popupMode = options.mode;
    popupEyebrow.textContent = options.eyebrow || "Action";
    popupTitle.textContent = options.title || "Confirm action";
    popupDescription.textContent = options.description || "";
    popupConfirmBtn.textContent = options.confirmLabel || "Confirm";
    popupCancelBtn.textContent = options.cancelLabel || "Cancel";
    popupConfirmBtn.classList.toggle("danger", Boolean(options.danger));
    popupField.classList.toggle("hidden", options.mode !== "prompt");
    if (options.mode === "prompt") {
        popupInputLabel.textContent = options.label || "Value";
        popupInput.value = options.value || "";
        popupInput.placeholder = options.placeholder || "";
    } else {
        popupInput.value = "";
    }
    popupModal.classList.remove("hidden");
    return new Promise((resolve) => {
        popupResolver = resolve;
        requestAnimationFrame(() => {
            if (options.mode === "prompt") {
                popupInput.focus();
                popupInput.select();
            } else {
                popupConfirmBtn.focus();
            }
        });
    });
}
function confirmPopup(options) {
    return openPopup({ ...options, mode: "confirm" }).then((result) => Boolean(result));
}
function promptPopup(options) {
    return openPopup({ ...options, mode: "prompt" }).then((result) => typeof result === "string" ? result : null);
}

function renderPersonaList(items, activeId, listElement, personaType) {
    if (!listElement) {
        renderPersonaSection();
        return;
    }
    listElement.innerHTML = "";
    if (!items.length) {
        const empty = document.createElement("p");
        empty.className = "status persona-status";
        empty.textContent = "No personas yet. Create one to get started.";
        listElement.appendChild(empty);
        renderPersonaSection();
        return;
    }
    items.forEach((persona) => {
        const item = document.createElement("div"), titleRow = document.createElement("div"), title = document.createElement("h4");
        const tag = document.createElement("span"), meta = document.createElement("p"), actions = document.createElement("div");
        item.className = `persona-item${personaType === "user" && persona.id === activeId ? " active" : ""}`; titleRow.className = "persona-title-row"; actions.className = "persona-item-actions";
        tag.className = `persona-role-tag ${personaType === "user" ? "user" : "ai"}`; tag.textContent = personaType === "user" ? "You" : "AI";
        title.textContent = persona.name; meta.textContent = persona.pronouns ? `Pronouns: ${persona.pronouns}` : "Pronouns: n/a";
        [[personaType === "assistant" ? "Start roleplay" : "Set default", () => equipPersona(persona.id, personaType), personaType === "user" && persona.id === activeId],
        ["Edit", () => openPersonaForm(persona), false],
        [publishedPersonaIds.has(persona.id) ? "Update listing" : "Publish", () => publishPersona(persona.id), false],
        ["Delete", () => deletePersona(persona.id), false]]
            .forEach(([label, handler, disabled]) => {
                const btn = document.createElement("button");
                btn.type = "button"; btn.textContent = label; btn.disabled = disabled; btn.addEventListener("click", handler); actions.appendChild(btn);
            });
        if (publishedPersonaIds.has(persona.id)) {
            const btn = document.createElement("button");
            btn.type = "button"; btn.textContent = "Unpublish"; btn.addEventListener("click", () => unpublishPersona(persona.id)); actions.appendChild(btn);
        }
        titleRow.append(title, tag); item.append(titleRow, meta, actions); listElement.appendChild(item);
    });
    renderPersonaSection();
}

async function loadSummary() {
    updateWorkspaceCopy();
    return currentSummary;
}

async function loadPersonas() {
    const res = await get("/personas");
    if (res.error) return setNotice(res.error, "error");
    assistantPersonas = res.assistantPersonas || []; userPersonas = res.userPersonas || [];
    activeUserPersonaId = res.activeUserPersonaId || null; publishedPersonaIds = new Set(res.publishedPersonaIds || []);
    renderPersonaList(userPersonas, activeUserPersonaId, userPersonaList, "user");
    populateRoleplayStarter();
    renderPersonaSection();
    updateWorkspaceCopy();
}

async function equipPersona(id, type) {
    if (type === "assistant") {
        openRoleplayStarter(id);
        return;
    }
    const res = await post(`/personas/${id}/equip-user`, {});
    if (res.error) return setNotice(res.error, "error");
    activeUserPersonaId = id;
    renderPersonaList(userPersonas, activeUserPersonaId, userPersonaList, "user");
    setNotice("User persona updated.", "success");
}

async function clearPersona(type) {
    if (type !== "user") return;
    const res = await post("/personas/user/clear", {});
    if (res.error) return setNotice(res.error, "error");
    activeUserPersonaId = null;
    renderPersonaList(userPersonas, activeUserPersonaId, userPersonaList, "user");
    setNotice("Persona cleared.", "success");
}

async function savePersona() {
    const payload = {
        personaType: personaTypeSelect.value,
        name: personaNameInput.value.trim(),
        pronouns: personaPronounsInput.value.trim(),
        appearance: personaAppearanceInput.value.trim(),
        background: personaBackgroundInput.value.trim(),
        details: personaDetailsInput.value.trim(),
        exampleDialogues: personaTypeSelect.value === "assistant" ? personaExampleDialoguesInput.value.trim() : ""
    };
    if (!payload.name) return setPersonaFormNotice("Persona name is required.", "error");
    const res = editingPersonaId ? await put(`/personas/${editingPersonaId}`, payload) : await post("/personas", payload);
    if (res.error) return setPersonaFormNotice(res.error, "error");
    const wasEditing = Boolean(editingPersonaId);
    await loadPersonas();
    if (payload.personaType === "assistant") await loadChatSessions();
    closePersonaForm(); setNotice(wasEditing ? "Persona updated." : "Persona created.", "success");
}

async function deletePersona(id) {
    const persona = assistantPersonas.find((item) => item.id === id) || userPersonas.find((item) => item.id === id);
    if (!persona) return;
    const confirmed = await confirmPopup({
        eyebrow: persona.persona_type === "user" ? "Your persona" : "AI Character",
        title: "Delete persona",
        description: `Delete "${persona.name}"? This removes it from your library and any active slot.`,
        confirmLabel: "Delete",
        danger: true
    });
    if (!confirmed) return;
    const res = await del(`/personas/${id}`);
    if (res.error) return setNotice(res.error, "error");
    await loadPersonas();
    if (persona.persona_type === "assistant") await loadChatSessions();
    setNotice("Persona deleted.", "success");
}
async function publishPersona(id) { const res = await post(`/personas/${id}/publish`, {}); if (res.error) return setNotice(res.error, "error"); await loadPersonas(); setNotice("Persona published.", "success"); }
async function unpublishPersona(id) { const res = await post(`/personas/${id}/unpublish`, {}); if (res.error) return setNotice(res.error, "error"); await loadPersonas(); setNotice("Persona unpublished.", "success"); }

function setLoadingState(loading, overlayOptions = null) {
    isProcessing = loading;
    msgInput.disabled = loading;
    webSearchButton.disabled = loading;
    reasoningToggle.setBusy(loading);
    attachmentComposer.setBusy(loading);
    sendBtn.classList.toggle("loading", loading);
    messagesDiv.querySelectorAll('[data-message-action="regenerate"]').forEach((button) => {
        button.disabled = loading || button.dataset.retryLimitReached === "true";
    });
    if (loading) {
        msgInput.placeholder = "Processing response...";
        if (overlayOptions === false) {
            setChatActivity(false);
        } else {
            setChatActivity(true, overlayOptions || undefined);
        }
    } else {
        setChatActivity(false);
        updateComposerPlaceholder();
    }
    updateSendState();
}

async function stopGeneration() {
    const chatId = regenerationChatId ?? activeChatId;
    if (!isProcessing || !chatId) return;
    const res = await post(`/chats/${chatId}/stop`, {});
    if (res.error) return setNotice(res.error, "error");
    setNotice(res.stopped ? "Stopping generation..." : "Generation already finished.");
}

async function setActiveChat(id) {
    if (isMobileLayout()) closeMobileSidebar();
    setChatLoading(true, "Opening chat...");
    setChatActivity(true, {
        eyebrow: "Opening chat",
        title: "Loading conversation",
        detail: "Fetching messages and restoring the current scene."
    });
    activeChatId = id;
    history.replaceState(null, "", `/app/chats/${id}`);
    messageRetryState = new Map();
    updateWorkspaceCopy(); renderChatList(); updateChatActionState();
    const res = await get(`/chats/${id}/messages`);
    if (res.error) {
        setChatLoading(false);
        setChatActivity(false);
        return setNotice(res.error, "error");
    }
    const existing = getChatById(id);
    if (res.chat && existing) Object.assign(existing, res.chat);
    populateGenerationSettings(res.chat || existing);
    currentMessages = res.messages || []; renderMessages();
    updateSendState();
    setChatLoading(false);
    setChatActivity(false);
}

async function loadChatSessions() {
    setChatLoading(true, "Loading chats...");
    const query = chatSearchInput?.value.trim();
    const res = query ? await get(`/chats/search?q=${encodeURIComponent(query)}`) : await get("/chats");
    if (res.error) {
        setChatLoading(false);
        return setNotice(res.error, "error");
    }
    chatSessions = res.chats || []; renderChatList();
    if (location.pathname.endsWith("/new") && !activeChatId) { currentMessages = []; renderMessages(); updateWorkspaceCopy(); updateSendState(); setChatLoading(false); return; }
    if (requestedChatId && !getChatById(requestedChatId) && !activeChatId) { setChatLoading(false); return setNotice("Conversation not found. Choose a chat from the sidebar or start a new one.", "error"); }
    if (chatSessions.length) {
        const preferredChatId = activeChatId && getChatById(activeChatId) ? activeChatId : (requestedChatId && getChatById(requestedChatId)) ? requestedChatId : chatSessions[0].id;
        setChatLoading(false);
        return setActiveChat(preferredChatId);
    }
    activeChatId = null;
    currentMessages = [];
    renderMessages();
    updateWorkspaceCopy();
    updateSendState();
    setChatLoading(false);
    return setNotice("Pick a starting action to begin.", "success");
}

async function createNewChat() {
    setChatLoading(true, "Creating chat...");
    setChatActivity(true, {
        eyebrow: "Creating chat",
        title: "Opening a new conversation",
        detail: "Setting up a fresh chat so you can start sending messages."
    });
    const res = await post("/chats", { title: "New chat" });
    if (res.error || !res.chat) {
        setChatLoading(false);
        setChatActivity(false);
        return setNotice(res.error || "Unable to create chat.", "error");
    }
    chatSessions.unshift(res.chat); await loadSummary(); renderChatList(); await setActiveChat(res.chat.id); setNotice("New chat created.", "success");
    msgInput.focus();
    setChatLoading(false);
    setChatActivity(false);
}

async function startRoleplay() {
    if (roleplayStarterStep === 1) {
        goToRoleplayStarterSceneStep();
        return;
    }
    setChatLoading(true, "Starting roleplay...");
    setChatActivity(true, {
        eyebrow: "Starting roleplay",
        title: "Building the opening scene",
        detail: "Generating the first beat and opening the roleplay chat."
    });
    const assistantPersonaId = Number(roleplayCharacterSelect.value);
    const userPersonaId = roleplayUserPersonaSelect.value ? Number(roleplayUserPersonaSelect.value) : null;
    const scenarioPrompt = roleplayScenarioInput?.value.trim() || "";
    if (!assistantPersonaId) {
        setChatLoading(false);
        setChatActivity(false);
        return setRoleplayStarterNotice("Choose a character to start the roleplay.", "error");
    }
    roleplayStarterConfirm.disabled = true;
    setRoleplayStarterNotice("Building the opening scene...");
    const res = await post("/roleplays/start", {
        assistantPersonaId,
        userPersonaId,
        scenarioPrompt,
        model: modelSelect.value
    });
    roleplayStarterConfirm.disabled = false;
    if (res.error || !res.chat) {
        setChatLoading(false);
        setChatActivity(false);
        return setRoleplayStarterNotice(res.error || "Unable to start roleplay.", "error");
    }
    closeRoleplayStarter();
    await loadChatSessions();
    await setActiveChat(res.chat.id);
    setNotice(
        res.degraded
            ? "Roleplay started, but the opening scene timed out. Send the first message to continue."
            : res.generatedInitialMessage ? "Roleplay started with a fresh scene." : "Roleplay reopened.",
        res.degraded ? "error" : "success"
    );
    setChatLoading(false);
    setChatActivity(false);
}

async function renameChat(id) {
    const chat = getChatById(id);
    const nextTitle = chat ? await promptPopup({
        eyebrow: "Conversation",
        title: "Rename chat",
        description: "Choose a new title for this thread.",
        label: "Chat title",
        value: chat.title,
        placeholder: "New chat",
        confirmLabel: "Save"
    }) : "";
    const title = (nextTitle || "").trim();
    if (!chat || !title) return;
    const res = await put(`/chats/${id}`, { title });
    if (res.error) return setNotice(res.error, "error");
    chat.title = title; updateWorkspaceCopy(); renderChatList(); setNotice("Chat renamed.", "success");
}

async function updateChatOrganization(id, changes) {
    const chat = getChatById(id);
    if (!chat) return;
    const payload = {
        folderName: changes.folderName !== undefined ? changes.folderName : chat.folder_name,
        isPinned: changes.isPinned !== undefined ? changes.isPinned : Boolean(chat.is_pinned),
        archived: changes.archived !== undefined ? changes.archived : Boolean(chat.archived_at)
    };
    const res = await put(`/chats/${id}/organization`, payload);
    if (res.error) return setNotice(res.error, "error");
    const index = chatSessions.findIndex((item) => item.id === id);
    if (index >= 0) chatSessions[index] = res.chat;
    updateWorkspaceCopy();
    renderChatList();
    updateChatActionState();
}

async function clearChat(id) {
    const chat = getChatById(id);
    if (!chat) return;
    const confirmed = await confirmPopup({
        eyebrow: "Conversation",
        title: "Clear messages",
        description: `Clear all messages in "${chat.title}"? The chat will stay, but its history will be removed.`,
        confirmLabel: "Clear",
        danger: true
    });
    if (!confirmed) return;
    const res = await post(`/chats/${id}/clear`, {});
    if (res.error) return setNotice(res.error, "error");
    messageRetryState = new Map();
    currentMessages = []; renderMessages(); await loadSummary(); setNotice("Chat cleared.", "success");
}

function exportCurrentChat() {
    const chat = getChatById(activeChatId);
    if (!chat || !currentMessages.length) return;
    void (async () => {
        const format = await promptPopup({
            eyebrow: "Export",
            title: "Export format",
            description: "Use txt, md, or json.",
            label: "Format",
            value: "md",
            placeholder: "md",
            confirmLabel: "Download"
        });
        const normalized = ["txt", "md", "json"].includes(String(format || "").trim().toLowerCase())
            ? String(format).trim().toLowerCase()
            : "md";
        const response = await fetch(`/exports/chats/${activeChatId}?format=${normalized}`);
        const blob = await response.blob();
        const url = URL.createObjectURL(blob);
        const link = document.createElement("a");
        link.href = url;
        link.download = `${(chat.title.replace(/[^a-z0-9-_]+/gi, "-").replace(/^-+|-+$/g, "") || "chat")}.${normalized}`;
        document.body.appendChild(link);
        link.click();
        link.remove();
        URL.revokeObjectURL(url);
        setNotice(`Chat exported as ${normalized}.`, "success");
    })();
}

async function backupWorkspace() {
    const response = await fetch("/exports/workspace");
    const data = await response.json();
    const blob = new Blob([JSON.stringify(data.workspace, null, 2)], { type: "application/json;charset=utf-8" });
    const url = URL.createObjectURL(blob);
    const link = document.createElement("a");
    link.href = url;
    link.download = `workspace-backup-${new Date().toISOString().slice(0, 10)}.json`;
    document.body.appendChild(link);
    link.click();
    link.remove();
    URL.revokeObjectURL(url);
    setNotice("Workspace backup downloaded.", "success");
}

function formatImportPreview(preview, warnings = []) {
    const counts = [
        `${preview.personas || 0} persona${preview.personas === 1 ? "" : "s"}`,
        `${preview.chats || 0} chat${preview.chats === 1 ? "" : "s"}`,
        `${preview.messages || 0} message${preview.messages === 1 ? "" : "s"}`,
        `${preview.templates || 0} template${preview.templates === 1 ? "" : "s"}`
    ].join(", ");
    const warningText = warnings.length ? ` Warnings: ${warnings.slice(0, 4).join("; ")}${warnings.length > 4 ? "; ..." : ""}` : "";
    return `Import preview: ${counts}.${warningText}`;
}

async function importWorkspaceFromFile(file) {
    if (!file) return;
    setChatLoading(true, "Reading workspace backup...");
    let workspace;
    try {
        workspace = JSON.parse(await file.text());
    } catch {
        setChatLoading(false);
        return setNotice("Import failed: choose a valid JSON workspace backup.", "error");
    }

    const preview = await post("/imports/workspace/preview", { workspace });
    if (preview.error || preview.ok === false) {
        setChatLoading(false);
        const detail = (preview.errors || []).slice(0, 4).join("; ");
        return setNotice(detail || preview.error || "Workspace import validation failed.", "error");
    }

    setChatLoading(false);
    const confirmed = await confirmPopup({
        eyebrow: "Workspace import",
        title: "Review import",
        description: formatImportPreview(preview.preview || {}, preview.warnings || []),
        confirmLabel: "Import"
    });
    if (!confirmed) return;

    setChatLoading(true, "Importing workspace...");
    const imported = await post("/imports/workspace", {
        workspace,
        allowDuplicates: Boolean(preview.preview?.duplicates?.length)
    });
    if (imported.error) {
        setChatLoading(false);
        const detail = (imported.errors || imported.warnings || []).slice(0, 4).join("; ");
        return setNotice(detail || imported.error, "error");
    }
    await Promise.all([loadPersonas(), loadChatSessions()]);
    setChatLoading(false);
    setNotice(`Workspace imported: ${imported.imported.personas} personas, ${imported.imported.chats} chats, ${imported.imported.templates} templates.`, "success");
}

function formatMemoryList(memories) {
    if (!memories.length) return "No memory facts saved for this chat yet.";
    return memories.map((memory, index) => `${index + 1}. ${memory.fact}`).join("\n");
}

async function manageChatMemory() {
    if (!activeChatId) return;
    const loaded = await get(`/chats/${activeChatId}/memories`);
    if (loaded.error) return setNotice(loaded.error, "error");
    const memories = loaded.memories || [];
    const action = await promptPopup({
        eyebrow: "Memory",
        title: "Memory facts",
        description: `${formatMemoryList(memories)}\n\nType a new fact to add it, or type delete 1 to remove a fact.`,
        label: "Fact or command",
        placeholder: "The user prefers terse answers.",
        confirmLabel: "Save"
    });
    const value = String(action || "").trim();
    if (!value) return;
    const deleteMatch = value.match(/^delete\s+(\d+)$/i);
    if (deleteMatch) {
        const target = memories[Number(deleteMatch[1]) - 1];
        if (!target) return setNotice("Memory number not found.", "error");
        const removed = await del(`/chats/${activeChatId}/memories/${target.id}`);
        if (removed.error) return setNotice(removed.error, "error");
        return setNotice("Memory fact deleted.", "success");
    }
    const saved = await post(`/chats/${activeChatId}/memories`, { fact: value });
    if (saved.error) return setNotice(saved.error, "error");
    return setNotice("Memory fact saved.", "success");
}

const personaStateFields = [
    ["relationship_notes", "Relationship notes"],
    ["tone", "Tone"],
    ["current_location", "Current location"],
    ["goals", "Goals"],
    ["unresolved_threads", "Unresolved threads"],
    ["boundaries", "Boundaries"]
];

function formatPersonaState(state = {}) {
    const lines = personaStateFields.map(([key, label], index) => {
        const value = String(state[key] || "").trim();
        return `${index + 1}. ${label}: ${value || "Not set"}`;
    });
    return lines.join("\n");
}

async function managePersonaState() {
    if (!activeChatId) return;
    const loaded = await get(`/chats/${activeChatId}/persona-state`);
    if (loaded.error) return setNotice(loaded.error, "error");
    const state = loaded.state || {};
    const fieldChoice = await promptPopup({
        eyebrow: "Roleplay",
        title: "Roleplay state",
        description: `${formatPersonaState(state)}\n\nType a field number to edit it.`,
        label: "Field number",
        placeholder: "1",
        confirmLabel: "Next"
    });
    const selected = personaStateFields[Number(String(fieldChoice || "").trim()) - 1];
    if (!selected) return;
    const [key, label] = selected;
    const value = await promptPopup({
        eyebrow: "Roleplay",
        title: label,
        description: "Leave blank to clear this field.",
        label,
        value: state[key] || "",
        placeholder: label
    });
    if (value === null) return;
    const nextState = { ...state, [key]: String(value || "").trim() || null };
    const saved = await put(`/chats/${activeChatId}/persona-state`, nextState);
    if (saved.error) return setNotice(saved.error, "error");
    return setNotice("Roleplay state saved.", "success");
}

async function deleteChat(id) {
    setChatLoading(true, "Deleting chat...");
    const chat = getChatById(id);
    if (!chat) {
        setChatLoading(false);
        return;
    }
    const confirmed = await confirmPopup({
        eyebrow: "Conversation",
        title: "Delete chat",
        description: `Delete "${chat.title}"? This permanently removes the conversation.`,
        confirmLabel: "Delete",
        danger: true
    });
    if (!confirmed) {
        setChatLoading(false);
        return;
    }
    const res = await del(`/chats/${id}`);
    if (res.error) {
        setChatLoading(false);
        return setNotice(res.error, "error");
    }
    chatSessions = chatSessions.filter((item) => item.id !== id);
    if (activeChatId === id) { activeChatId = null; currentMessages = []; renderMessages(); }
    messageRetryState = new Map();
    await loadSummary(); renderChatList();
    if (chatSessions.length) await setActiveChat(chatSessions[0].id); else await createNewChat();
    setNotice("Chat deleted.", "success");
    setChatLoading(false);
}

async function displayModels() {
    const res = await get("/models");
    const models = Array.isArray(res.models) ? res.models : null;
    if (res.error || !models) {
        availableModelsById = new Map();
        modelSelect.innerHTML = "<option>Error loading models</option>";
        renderModelSection();
        return setNotice("Models could not be loaded.", "error");
    }
    modelSelect.innerHTML = "";
    availableModelsById = new Map(models.map((model) => [String(model.model || model.name || ""), model]));
    const preferredModelId = "qwen3:14b";
    const preferredIndex = models.findIndex((model) => (model.model || model.name) === preferredModelId);
    models.forEach((model, index) => {
        const modelId = String(model.model || model.name || "");
        const option = document.createElement("option");
        option.value = modelId;
        option.textContent = model.name || modelId;
        option.title = getModelProfile(model).summary;
        option.selected = preferredIndex >= 0 ? index === preferredIndex : index === 0;
        modelSelect.appendChild(option);
    });
    const activeChat = getChatById(activeChatId);
    if (activeChat?.preferred_model && models.some((model) => (model.model || model.name) === activeChat.preferred_model)) {
        modelSelect.value = activeChat.preferred_model;
    }
    renderModelSection();
}

async function checkSession() {
    const res = await get("/session");
    if (!res.user) { window.location.replace(`/login?next=${encodeURIComponent(location.pathname + location.search)}`); return false; }
    currentUsername = res.user; chatDiv.classList.remove("hidden");
    await Promise.all([displayModels(), loadSummary(), loadChatSessions(), loadPersonas()]);
    // Starters are offered on workspace home.
    const starter = new URLSearchParams(location.search).get("prompt");
    if (starter) { msgInput.value = starter; resizeComposerInput(); updateSendState(); }
    msgInput.focus(); return true;
}

async function sendMessage() {
    if (isProcessing) return;
    if (attachmentComposer.pending) return;
    const attachments = attachmentComposer.attachments;
    const message = msgInput.value.trim() || (attachments.length ? "Describe the attached images." : "");
    if (!message) return;
    const webSearch = webSearchToggle.enabled;
    const reasoning = reasoningToggle.enabled;
    if (!activeChatId) await createNewChat();
    const currentChat = getChatById(activeChatId);
    if (currentChat && !currentChat.assistant_persona_id && currentChat.title === "New chat") {
        const autoTitle = message.length > 40 ? `${message.slice(0, 40)}...` : message;
        currentChat.title = autoTitle; updateWorkspaceCopy(); renderChatList(); await put(`/chats/${activeChatId}`, { title: autoTitle });
    }
    const userMessage = { role: "user", content: message, attachments };
    currentMessages.push(userMessage); addMessage(userMessage, true); updateChatActionState();
    msgInput.value = "";
    resizeComposerInput();
    setLoadingState(true, false); setNotice("Generating reply...");
    const loadingMsg = addMessage({ role: "bot", content: "" }, false, true, { isNewest: true });
    const loadingBody = loadingMsg.querySelector(".msg-content");
    const loadingShell = loadingMsg.querySelector(".loading-shell");
    const loadingLabel = loadingMsg.querySelector(".loading-copy strong");
    loadingLabel.textContent = "Preparing response...";
    try {
        let streamError = null;
        await stream("/chat/stream", { message, attachments: attachments.map(item => item.id), model: modelSelect.value, chatId: activeChatId, webSearch, reasoning }, {
            onStatus: ({ status, sourceCount, searchState }) => {
                if (status === "accepted") {
                    attachmentComposer.clear();
                    webSearchToggle.reset();
                    reasoningToggle.reset();
                    return;
                }
                loadingLabel.textContent = status === "analyzing" ? "Analyzing images..." : status === "searching" ? "Searching the web..."
                    : searchState === "no_relevant_results" ? "No sufficiently relevant results. Generating response..."
                        : sourceCount === 0 ? "No web results found. Generating response..." : "Generating response...";
            },
            onThinking: ({ fullThinking }) => {
                if (!reasoning) return;
                const follow = messagesDiv.scrollHeight - messagesDiv.scrollTop - messagesDiv.clientHeight < 100;
                updateReasoning(loadingMsg, fullThinking, true);
                loadingShell?.classList.toggle("hidden", Boolean(fullThinking));
                if (follow) scrollMessagesToBottom();
            },
            onChunk: ({ fullReply }) => {
                const follow = messagesDiv.scrollHeight - messagesDiv.scrollTop - messagesDiv.clientHeight < 100;
                if (fullReply) finishReasoning(loadingMsg);
                if (loadingBody) {
                    loadingShell?.classList.toggle("hidden", Boolean(fullReply));
                    loadingLabel.textContent = "Generating response...";
                    loadingBody.classList.add("has-content");
                    setMessageContent(loadingBody, fullReply);
                }
                if (follow) scrollMessagesToBottom();
            },
            onDone: () => { webSearchToggle.reset(); reasoningToggle.reset(); finishReasoning(loadingMsg); },
            onError: ({ error }) => {
                streamError = error || "Failed to generate reply.";
            }
        });
        const followOutput = messagesDiv.scrollHeight - messagesDiv.scrollTop - messagesDiv.clientHeight < 100;
        const previousScrollTop = messagesDiv.scrollTop;
        if (messagesDiv.contains(loadingMsg)) messagesDiv.removeChild(loadingMsg);
        if (streamError) {
            if (webSearch) {
                msgInput.value = message;
                resizeComposerInput();
            }
            addMessage(`[Error: ${streamError}]`);
            setNotice(streamError, "error");
            return;
        }
        await setActiveChat(activeChatId);
        await loadSummary();
        markOnboardingCompleted();
        if (!followOutput) requestAnimationFrame(() => { messagesDiv.scrollTop = previousScrollTop; });
        maybeShowPersonaNudge();
        setNotice("Reply received.", "success");
    } catch (error) {
        if (messagesDiv.contains(loadingMsg)) messagesDiv.removeChild(loadingMsg);
        if (webSearch) {
            msgInput.value = message;
            resizeComposerInput();
        }
        const errorMessage = error?.message || "Network error while sending message.";
        addMessage(`[Error: ${errorMessage}]`); setNotice(errorMessage, "error");
    } finally {
        setLoadingState(false); msgInput.focus(); updateChatActionState();
    }
}

const chatActions = {
    archive: async () => {
        const chat = getChatById(activeChatId);
        if (chat) await updateChatOrganization(chat.id, { archived: !chat.archived_at });
    },
    clear: async () => {
        if (activeChatId) await clearChat(activeChatId);
    },
    export: () => {
        exportCurrentChat();
    },
    folder: async () => {
        const chat = getChatById(activeChatId);
        if (!chat) return;
        const folderName = await promptPopup({
            eyebrow: "Folder",
            title: "Move chat to folder",
            description: "Leave blank to remove the folder.",
            label: "Folder name",
            value: chat.folder_name || "",
            placeholder: "Research"
        });
        if (folderName === null) return;
        await updateChatOrganization(chat.id, { folderName: String(folderName || "").trim() || null });
    },
    memory: async () => {
        await manageChatMemory();
    },
    personaState: async () => {
        await managePersonaState();
    },
    pin: async () => {
        const chat = getChatById(activeChatId);
        if (chat) await updateChatOrganization(chat.id, { isPinned: !chat.is_pinned });
    },
    rename: async () => {
        if (activeChatId) await renameChat(activeChatId);
    }
};

function bindChatDrawerActions() {
    document.querySelectorAll("[data-chat-action]").forEach((button) => {
        button.addEventListener("click", async () => {
            closeChatDrawer();
            const action = chatActions[button.dataset.chatAction];
            if (typeof action === "function") await action();
        });
    });
}

sendBtn.addEventListener("click", () => { void (isProcessing ? stopGeneration() : sendMessage()); });
msgInput.addEventListener("keydown", (event) => { if (event.key === "Enter" && !event.shiftKey) { event.preventDefault(); void sendMessage(); } });
msgInput.addEventListener("input", function () {
    resizeComposerInput();
    updateSendState();
});
resizeComposerInput();
newChatBtn.addEventListener("click", () => {
    closeChatDrawer();
    closeMobileSidebar();
    void createNewChat();
});
if (backupWorkspaceBtn) backupWorkspaceBtn.addEventListener("click", () => {
    closeChatDrawer();
    void backupWorkspace();
});
if (importWorkspaceBtn) importWorkspaceBtn.addEventListener("click", () => {
    closeChatDrawer();
    importWorkspaceFileInput.value = "";
    importWorkspaceFileInput.click();
});
if (importWorkspaceFileInput) importWorkspaceFileInput.addEventListener("change", () => {
    void importWorkspaceFromFile(importWorkspaceFileInput.files?.[0]);
});
chatSearchInput.addEventListener("input", () => { void loadChatSessions(); });
modelSelect.addEventListener("change", () => {
    renderModelSection();
    void saveSelectedModel();
});
if (headerModelButton) headerModelButton.addEventListener("click", (event) => {
    event.stopPropagation();
    openModelSettings();
});
saveGenerationSettingsBtn.addEventListener("click", () => { void saveGenerationSettings(); });
roleplayNewPersonaBtn.addEventListener("click", () => openPersonaForm(null, "assistant"));
clearUserPersonaBtn.addEventListener("click", () => {
    closeChatDrawer();
    void clearPersona("user");
});
personaForm.addEventListener("submit", (event) => { event.preventDefault(); void savePersona(); }); personaCloseBtn.addEventListener("click", closePersonaForm);
personaTypeSelect.addEventListener("change", () => {
    const isAssistant = personaTypeSelect.value === "assistant";
    personaExamplesField.classList.toggle("hidden", !isAssistant);
    if (!isAssistant) personaExampleDialoguesInput.value = "";
});
personaModal.addEventListener("click", (event) => { if (event.target === personaModal) closePersonaForm(); });
roleplayStarterClose.addEventListener("click", closeRoleplayStarter);
roleplayStarterCancel.addEventListener("click", closeRoleplayStarter);
if (roleplayStarterBack) {
    roleplayStarterBack.addEventListener("click", () => {
        roleplayStarterStep = 1;
        setRoleplayStarterNotice("");
        renderRoleplayStarterStep();
        roleplayCharacterSelect.focus();
    });
}
roleplayStarterConfirm.addEventListener("click", () => { void startRoleplay(); });
roleplayCharacterSelect.addEventListener("change", updateRoleplaySuggestions);
roleplayUserPersonaSelect.addEventListener("change", updateRoleplaySuggestions);
roleplayStarterModal.addEventListener("click", (event) => { if (event.target === roleplayStarterModal) closeRoleplayStarter(); });
popupConfirmBtn.addEventListener("click", () => {
    if (popupMode === "prompt") {
        closePopup(popupInput.value);
        return;
    }
    closePopup(true);
});
popupCancelBtn.addEventListener("click", () => closePopup(false));
popupCloseBtn.addEventListener("click", () => closePopup(false));
popupModal.addEventListener("click", (event) => { if (event.target === popupModal) closePopup(false); });
popupInput.addEventListener("keydown", (event) => {
    if (event.key === "Enter") {
        event.preventDefault();
        closePopup(popupInput.value);
    }
});
bindChatDrawerActions();
if (chatSidebar) {
    chatSidebar.addEventListener("click", (event) => event.stopPropagation());
}
if (chatSidebarToggle) {
    chatSidebarToggle.addEventListener("click", (event) => {
        event.stopPropagation();
        if (document.body.classList.contains("sidebar-open")) {
            closeMobileSidebar();
            return;
        }
        openMobileSidebar();
    });
}
if (onboardingContinue) {
    onboardingContinue.addEventListener("click", () => {
        onboardingStep = 2;
        renderOnboardingStep();
    });
}
if (onboardingBack) {
    onboardingBack.addEventListener("click", () => {
        onboardingStep = 1;
        renderOnboardingStep();
    });
}
if (onboardingSkip) {
    onboardingSkip.addEventListener("click", markOnboardingCompleted);
}
if (onboardingModal) {
    onboardingModal.addEventListener("click", (event) => {
        if (event.target === onboardingModal) markOnboardingCompleted();
    });
}
document.addEventListener("click", () => {
    closeMobileSidebar();
});
window.addEventListener("resize", () => {
    if (!isMobileLayout()) closeMobileSidebar();
});
document.addEventListener("keydown", (event) => {
    if (event.key === "Escape") {
        closeMobileSidebar();
        closeRoleplayStarter();
        closePersonaForm();
        closePopup(false);
        closeOnboarding();
    }
});
window.addEventListener("load", async () => {
    const appearance = readStoredAppearance();
    applyTheme(appearance.theme, false);
    applyThemeMode(appearance.mode, false);
    applyWorkspaceMode(localStorage.getItem("krishd-workspace-mode") || "basic", false);
    setNotice("Ready.");
    updateChatActionState();
    updateSendState();
    await checkSession();
});