LosaDev Tools: Lost Saga modding tools in the browser

app/src/worker/lib/main/iopman.js

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+// Web stand-in for the desktop iopman.js (IOP Manager sessions). The packs of the opened game folder
+// are registered as sessions, so every tool that works with "a pack open in IOP Manager" (UI image
+// sets: Load, texture source "packs next to …") works with the game folder. The web IOP Manager
+// (PLAN phase 8b) will add its own packs here too.
+// Session ids are numbers, like the desktop's: the renderer does Number(select.value).
+const registry = new Map(); // id -> { id, name, file, pack, key, game }
+const idOfFile = new Map(); // lower file path -> id (stable while the page is open)
+let nextId = 1;
+
+/** Replace the game folder's packs: [{ name, file, pack, key }] (key = detected profile or null). */
+export function setGamePacks(list) {
+	for (const [id, s] of [...registry]) if (s.game) registry.delete(id);
+	for (const p of list) {
+		const k = p.file.toLowerCase();
+		if (!idOfFile.has(k)) idOfFile.set(k, nextId++);
+		const id = idOfFile.get(k);
+		registry.set(id, { id, game: true, ...p });
+	}
+}
+
+/** Same shape as the desktop: { id, name, file, encrypted, detected, profileId }. */
+export function sessions() {
+	return [...registry.values()].map((s) => ({
+		id: s.id,
+		name: s.name,
+		file: s.file,
+		encrypted: !!s.encrypted,
+		detected: !!s.key,
+		profileId: s.key ? s.key.id : null,
+		entries: s.pack.liveEntries().length,
+	}));
+}
+
+/** { pack, password (type 0 of the detected key), file } of a session. */
+export function handle(id) {
+	const s = registry.get(Number(id));
+	if (!s) throw new Error("That pack is not open any more. Open the game folder again.");
+	return { pack: s.pack, password: s.key ? s.key.passwords[0] : null, file: s.file };
+}
+
+export async function addData() {
+	throw new Error("Saving into packs is not available yet.");
+}
+
+export const replaceData = addData;
+
+export default { sessions, handle, addData, replaceData, setGamePacks };