Add support for message history pagination, preserve scroll in rendering, and improve draft/message workflows.

2026-10-06 00:32:18 +02:00
parent 1c0f06716e
commit 387c0ac2e7
40 changed files with 2374 additions and 1314 deletions
@@ -0,0 +1,37 @@
+/** Text and uploaded attachment references only, scoped to the signed-in account. */
+export function createDraftStore(username, {storage = globalThis.localStorage, onError = () => {}} = {}) {
+    const key = `krishd-drafts-v1:${encodeURIComponent(username)}`;
+    let records = {};
+    let warned = false;
+    const report = () => { if (!warned) onError("Draft recovery is unavailable in this browser. Keep this page open to retain your draft."); warned = true; };
+    try {
+        const saved = JSON.parse(storage.getItem(key) || "{}");
+        if (saved && typeof saved === "object" && !Array.isArray(saved)) records = saved;
+    } catch { report(); }
+    const normalizeId = id => id == null ? "new" : String(id);
+    const save = () => {
+        for (const [id, record] of Object.entries(records)) {
+            if (!record.text && !record.attachments?.length) delete records[id];
+        }
+        try { storage.setItem(key, JSON.stringify(records)); } catch { report(); }
+    };
+    const update = (id, changes) => {
+        id = normalizeId(id);
+        records[id] = {...records[id], ...changes};
+        save();
+    };
+    const textDrafts = new Map(Object.entries(records).filter(([, record]) => typeof record?.text === "string")
+        .map(([id, record]) => [id === "new" ? id : Number(id), record.text]));
+    const set = textDrafts.set.bind(textDrafts), remove = textDrafts.delete.bind(textDrafts);
+    textDrafts.set = (id, text) => { update(id, {text}); return set(id, text); };
+    textDrafts.delete = id => { update(id, {text: ""}); return remove(id); };
+    return {
+        textDrafts,
+        attachments(id) {
+            const items = records[normalizeId(id)]?.attachments;
+            return Array.isArray(items) ? items.filter(item => typeof item?.id === "string" && /^[a-f0-9-]{36}$/.test(item.id)) : [];
+        },
+        setAttachments(id, attachments) { update(id, {attachments}); },
+        clear(id) { delete records[normalizeId(id)]; remove(id); save(); }
+    };
+}