// @vitest-environment jsdom
import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';
import {act, cleanup, renderHook} from '@testing-library/react';
import useLibrarySync from './useLibrarySync.js';
import {fetchRoutes, json} from '../test/fetchRoutes.js';

const status = (lastSyncStatus, lastSyncedAt) => json(200, {lastSyncStatus, lastSyncedAt});

beforeEach(() => {
    vi.useFakeTimers();
    localStorage.setItem('tbp_session', '1');
});

afterEach(() => {
    cleanup();
    vi.useRealTimers();
    localStorage.clear();
});

describe('useLibrarySync', () => {
    it('shows a sync that runs longer than the poll limit as stale, not as running forever', async () => {
        const fetch = fetchRoutes({'GET /api/library/sync-status': status('RUNNING', null)});
        const {result} = renderHook(() => useLibrarySync({enabled: true, onComplete: () => {}}));
        await act(() => vi.advanceTimersByTimeAsync(0));
        expect(result.current.isRunning).toBe(true);

        await act(() => vi.advanceTimersByTimeAsync(125_000));

        expect(result.current.isRunning).toBe(false);
        expect(result.current.stale).toBe(true);
        const calls = fetch.mock.calls.length;
        await act(() => vi.advanceTimersByTimeAsync(30_000));
        expect(fetch.mock.calls.length).toBe(calls);
    });

    it('after watch() reports the end of a sync once, also when it never saw it running', async () => {
        let answer = status('OK', '2026-09-30T08:00:00Z');
        fetchRoutes({'GET /api/library/sync-status': () => answer});
        const onComplete = vi.fn();
        const {result} = renderHook(() => useLibrarySync({enabled: true, onComplete}));
        await act(() => vi.advanceTimersByTimeAsync(0));

        act(() => result.current.watch());
        await act(() => vi.advanceTimersByTimeAsync(0));
        // The sync was so fast that the next poll already sees it done.
        answer = status('OK', '2026-09-30T08:05:00Z');
        await act(() => vi.advanceTimersByTimeAsync(3_000));
        await act(() => vi.advanceTimersByTimeAsync(30_000));

        expect(onComplete).toHaveBeenCalledTimes(1);
    });

    it('reports the end of a running sync once', async () => {
        let answer = status('RUNNING', '2026-09-30T08:00:00Z');
        fetchRoutes({'GET /api/library/sync-status': () => answer});
        const onComplete = vi.fn();
        const {result} = renderHook(() => useLibrarySync({enabled: true, onComplete}));
        await act(() => vi.advanceTimersByTimeAsync(0));

        answer = status('FAILED', '2026-09-30T08:01:00Z');
        await act(() => vi.advanceTimersByTimeAsync(3_000));
        await act(() => vi.advanceTimersByTimeAsync(30_000));

        expect(onComplete).toHaveBeenCalledTimes(1);
        expect(result.current.status).toBe('FAILED');
    });

    it('fires onComplete only once when expectInitialSync flips after the watched run ended', async () => {
        let answer = status('OK', '2026-09-30T08:00:00Z');
        fetchRoutes({'GET /api/library/sync-status': () => answer});
        const onComplete = vi.fn();
        const {result, rerender} = renderHook(
            ({expectInitialSync}) => useLibrarySync({enabled: true, expectInitialSync, onComplete}),
            {initialProps: {expectInitialSync: false}});
        await act(() => vi.advanceTimersByTimeAsync(0));

        act(() => result.current.watch());
        await act(() => vi.advanceTimersByTimeAsync(0));
        answer = status('OK', '2026-09-30T08:05:00Z');
        await act(() => vi.advanceTimersByTimeAsync(3_000));
        expect(onComplete).toHaveBeenCalledTimes(1);

        // onComplete loads the list: isLoading goes true and back to false, and with 0 games expectInitialSync follows.
        rerender({expectInitialSync: true});
        await act(() => vi.advanceTimersByTimeAsync(0));
        rerender({expectInitialSync: false});
        await act(() => vi.advanceTimersByTimeAsync(0));

        expect(onComplete).toHaveBeenCalledTimes(1);
    });
});