// 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 };