import test from "node:test";
import assert from "node:assert/strict";
import {createComposerController} from "../public/js/composerController.js";
import {createConversationState} from "../public/js/conversationState.js";

const deferred = () => { let resolve; const promise = new Promise(done => { resolve = done; }); return {promise, resolve}; };
const noop = () => {};
const element = () => ({value: "Hello", style: {}, scrollHeight: 0, scrollTop: 0, clientHeight: 0,
    classList: {toggle: noop, add: noop}, setAttribute: noop, focus: noop, querySelectorAll: () => []});
function fixture(overrides = {}) {
    const state = createConversationState();
    const elements = {msgInput: element(), sendBtn: element(), messagesDiv: element(), modelSelect: {value: "original-model"}};
    const calls = {create: 0, streams: [], refresh: [], notices: []};
    const controller = createComposerController({state, elements,
        attachmentComposer: {pending: false, attachments: [], setBusy: noop, clear: noop, clearSentDraft: noop},
        webSearchButton: element(), reasoningToggle: {enabled: true, setBusy: noop, reset: noop}, webSearchToggle: {enabled: true, reset: noop},
        setChatActivity: noop, updateComposerPlaceholder: noop, setNotice: message => calls.notices.push(message),
        createNewChat: async () => {
            calls.create++;
            const chat = overrides.creation ? await overrides.creation : {id: 1, title: "New chat"};
            if (chat?.id) { state.activeChatId = chat.id; state.chatSessions.push(chat); }
            return chat;
        },
        getChatById: id => state.chatSessions.find(chat => chat.id === id),
        updateWorkspaceCopy: noop, renderChatList: noop, updateChatActionState: noop, scrollMessagesToBottom: noop,
        addMessage: () => ({isConnected: true, querySelector: () => element(), remove: noop, replaceWith: noop}),
        setMessageContent: noop, setActiveChat: async id => { calls.refresh.push(id); return overrides.refreshResult; }, loadSummary: noop, markOnboardingCompleted: noop, maybeShowPersonaNudge: noop,
        api: {put: async () => overrides.rename ? await overrides.rename : {}, post: async () => assert.fail("Send cancellation must abort its own request"),
            stream: async (_url, payload, handlers) => {
                calls.streams.push(payload);
                if (overrides.failure) throw new Error(overrides.failure);
                handlers.onDone({reply: "Done"});
            }}
    });
    return {state, elements, calls, ...controller};
}

test("rapid sends lock before chat creation and keep the captured chat/model after navigation during rename", async () => {
    const creation = deferred(), rename = deferred();
    const s = fixture({creation: creation.promise, rename: rename.promise});
    const first = s.sendMessage();
    await s.sendMessage();
    assert.equal(s.state.isProcessing, true);
    assert.equal(s.calls.create, 1);
    creation.resolve({id: 7, title: "New chat"});
    await new Promise(resolve => setImmediate(resolve));
    await s.sendMessage();
    s.state.activeChatId = 8;
    s.elements.modelSelect.value = "changed-model";
    s.elements.msgInput.value = "Draft in another conversation";
    rename.resolve({});
    await first;
    assert.equal(s.calls.streams.length, 1);
    assert.equal(s.calls.streams[0].chatId, 7);
    assert.equal(s.calls.streams[0].model, "original-model");
    assert.equal(s.calls.streams[0].reasoning, true);
    assert.deepEqual(s.calls.refresh, []);
    assert.deepEqual(s.state.currentMessages, []);
    assert.equal(s.elements.msgInput.value, "Draft in another conversation");
    assert.equal(s.state.isProcessing, false);
});

test("creation, rename and stream failures unlock sending and retain the draft", async () => {
    for (const options of [{creation: Promise.resolve({error: "Creation failed"})}, {rename: Promise.resolve({error: "Rename failed"})}, {failure: "Stream failed"}]) {
        const s = fixture(options);
        await s.sendMessage();
        assert.equal(s.state.isProcessing, false);
        assert.equal(s.elements.msgInput.disabled, false);
        assert.equal(s.elements.msgInput.value, "Hello");
        assert.match(s.calls.notices.at(-1), /failed/);
        if (options.failure) assert.equal(s.state.currentMessages[0].deliveryStatus, "failed");
        else assert.equal(s.calls.streams.length, 0);
    }
});

test("Stop during chat creation prevents a later stream and releases the send lock", async () => {
    const creation = deferred();
    const s = fixture({creation: creation.promise});
    const pending = s.sendMessage();
    await s.stopGeneration();
    creation.resolve({id: 4, title: "New chat"});
    await pending;
    assert.equal(s.calls.streams.length, 0);
    assert.equal(s.state.isProcessing, false);
    assert.equal(s.elements.msgInput.value, "Hello");
});

test("a completed reply and draft survive a failed history refresh without a false success notice", async () => {
    const s = fixture({refreshResult: {error: "History unavailable", status: 503}});
    await s.sendMessage();
    assert.equal(s.state.currentMessages.at(-1).content, "Done");
    assert.equal(s.state.currentMessages.filter(message => message.role === "bot").length, 1);
    assert.equal(s.elements.msgInput.value, "Hello");
    assert.match(s.calls.notices.at(-1), /could not be refreshed: History unavailable/);
    assert.ok(!s.calls.notices.includes("Reply received."));
    assert.equal(s.state.isProcessing, false);
});

test("navigation during refresh clears only the sent chat's saved draft", async () => {
    const refresh = deferred();
    const s = fixture({refreshResult: refresh.promise});
    const sending = s.sendMessage();
    await new Promise(resolve => setImmediate(resolve));
    s.state.chatDrafts.set(1, "Hello");
    s.state.activeChatId = 2;
    s.elements.msgInput.value = "Other chat draft";
    refresh.resolve({ok: true});
    await sending;
    assert.equal(s.state.chatDrafts.has(1), false);
    assert.equal(s.elements.msgInput.value, "Other chat draft");
});