// OrderDraftStore unit tests under JSDOM with `fake-indexeddb`
// standing in for the browser's IndexedDB factory. The store is
// driven directly with a real `IDBCache` so persistence is exercised
// the same way it would be inside the in-game shell layout.
//
// Each case opens a freshly named database so state cannot leak
// across tests; per-game isolation is verified explicitly by mixing
// drafts under different `gameId`s through one shared cache.

import "@testing-library/jest-dom/vitest";
import "fake-indexeddb/auto";
import { afterEach, beforeEach, describe, expect, test } from "vitest";
import type { IDBPDatabase } from "idb";

import { IDBCache } from "../src/platform/store/idb-cache";
import { openGalaxyDB, type GalaxyDB } from "../src/platform/store/idb";
import type { Cache } from "../src/platform/store/index";
import { OrderDraftStore } from "../src/sync/order-draft.svelte";
import type { OrderCommand } from "../src/sync/order-types";

let db: IDBPDatabase<GalaxyDB>;
let dbName: string;
let cache: Cache;

beforeEach(async () => {
	dbName = `galaxy-order-draft-test-${crypto.randomUUID()}`;
	db = await openGalaxyDB(dbName);
	cache = new IDBCache(db);
});

afterEach(async () => {
	db.close();
	await new Promise<void>((resolve) => {
		const req = indexedDB.deleteDatabase(dbName);
		req.onsuccess = () => resolve();
		req.onerror = () => resolve();
		req.onblocked = () => resolve();
	});
});

const GAME_ID = "11111111-2222-3333-4444-555555555555";

function placeholder(id: string, label: string): OrderCommand {
	return { kind: "placeholder", id, label };
}

describe("OrderDraftStore", () => {
	test("init on empty cache yields ready status with no commands", async () => {
		const store = new OrderDraftStore();
		expect(store.status).toBe("idle");
		await store.init({ cache, gameId: GAME_ID });
		expect(store.status).toBe("ready");
		expect(store.commands).toEqual([]);
		store.dispose();
	});

	test("add appends commands and persists across instances", async () => {
		const a = new OrderDraftStore();
		await a.init({ cache, gameId: GAME_ID });
		await a.add(placeholder("c1", "first"));
		await a.add(placeholder("c2", "second"));
		expect(a.commands.map((c) => c.id)).toEqual(["c1", "c2"]);
		a.dispose();

		const b = new OrderDraftStore();
		await b.init({ cache, gameId: GAME_ID });
		expect(b.commands.map((c) => c.id)).toEqual(["c1", "c2"]);
		expect(b.commands[1]).toEqual(placeholder("c2", "second"));
		b.dispose();
	});

	test("remove drops the matching command and persists the removal", async () => {
		const a = new OrderDraftStore();
		await a.init({ cache, gameId: GAME_ID });
		await a.add(placeholder("c1", "first"));
		await a.add(placeholder("c2", "second"));
		await a.add(placeholder("c3", "third"));
		await a.remove("c2");
		expect(a.commands.map((c) => c.id)).toEqual(["c1", "c3"]);
		a.dispose();

		const b = new OrderDraftStore();
		await b.init({ cache, gameId: GAME_ID });
		expect(b.commands.map((c) => c.id)).toEqual(["c1", "c3"]);
		b.dispose();
	});

	test("remove on a missing id is a silent no-op", async () => {
		const store = new OrderDraftStore();
		await store.init({ cache, gameId: GAME_ID });
		await store.add(placeholder("c1", "first"));
		await store.remove("absent");
		expect(store.commands.map((c) => c.id)).toEqual(["c1"]);
		store.dispose();
	});

	test("move reorders the commands and persists the new order", async () => {
		const a = new OrderDraftStore();
		await a.init({ cache, gameId: GAME_ID });
		await a.add(placeholder("c1", "first"));
		await a.add(placeholder("c2", "second"));
		await a.add(placeholder("c3", "third"));
		await a.move(0, 2);
		expect(a.commands.map((c) => c.id)).toEqual(["c2", "c3", "c1"]);
		a.dispose();

		const b = new OrderDraftStore();
		await b.init({ cache, gameId: GAME_ID });
		expect(b.commands.map((c) => c.id)).toEqual(["c2", "c3", "c1"]);
		b.dispose();
	});

	test("move with out-of-range or identical indices is a no-op", async () => {
		const store = new OrderDraftStore();
		await store.init({ cache, gameId: GAME_ID });
		await store.add(placeholder("c1", "first"));
		await store.add(placeholder("c2", "second"));
		await store.move(1, 1);
		await store.move(-1, 0);
		await store.move(0, 5);
		expect(store.commands.map((c) => c.id)).toEqual(["c1", "c2"]);
		store.dispose();
	});

	test("drafts under different game ids do not bleed through one cache", async () => {
		const otherGame = "99999999-9999-9999-9999-999999999999";

		const a = new OrderDraftStore();
		await a.init({ cache, gameId: GAME_ID });
		await a.add(placeholder("a1", "from-a"));
		a.dispose();

		const b = new OrderDraftStore();
		await b.init({ cache, gameId: otherGame });
		expect(b.commands).toEqual([]);
		await b.add(placeholder("b1", "from-b"));
		b.dispose();

		const reloadA = new OrderDraftStore();
		await reloadA.init({ cache, gameId: GAME_ID });
		expect(reloadA.commands.map((c) => c.id)).toEqual(["a1"]);
		reloadA.dispose();

		const reloadB = new OrderDraftStore();
		await reloadB.init({ cache, gameId: otherGame });
		expect(reloadB.commands.map((c) => c.id)).toEqual(["b1"]);
		reloadB.dispose();
	});

	test("mutations made before init resolves are ignored", async () => {
		const store = new OrderDraftStore();
		await store.add(placeholder("c1", "first"));
		await store.remove("c1");
		await store.move(0, 1);
		expect(store.status).toBe("idle");
		expect(store.commands).toEqual([]);

		await store.init({ cache, gameId: GAME_ID });
		expect(store.commands).toEqual([]);
		store.dispose();
	});

	test("dispose suppresses persistence side effects of in-flight mutations", async () => {
		const store = new OrderDraftStore();
		await store.init({ cache, gameId: GAME_ID });
		await store.add(placeholder("c1", "first"));
		store.dispose();
		// Adding after dispose is a no-op because status remains
		// `ready` but the cache pointer is null and the destroyed flag
		// blocks the persist path.
		await store.add(placeholder("c2", "second"));

		const reload = new OrderDraftStore();
		await reload.init({ cache, gameId: GAME_ID });
		expect(reload.commands.map((c) => c.id)).toEqual(["c1"]);
		reload.dispose();
	});
});