// @vitest-environment jsdom
import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';
import {act, cleanup, fireEvent, render, screen, waitFor, within} from '@testing-library/react';
import {MemoryRouter, Route, Routes} from 'react-router-dom';
import {toast} from 'sonner';
import ImportPage from './ImportPage.jsx';
import {initialChoice, stepOf} from '../utils/imports.js';
import {PreferencesProvider} from '../context/PreferencesContext.jsx';
import {CurrentUserProvider} from '../context/CurrentUserContext.jsx';
import {fetchRoutes, json} from '../test/fetchRoutes.js';
import {renderWithProviders} from '../test/renderWithProviders.jsx';

vi.mock('react-i18next', () => import('../test/i18n-mock.js'));
vi.mock('sonner', () => ({toast: {success: vi.fn(), error: vi.fn()}}));


const hades = {igdbId: 1, name: 'Hades', year: 2020, imageUrl: null, platforms: ['PC', 'Switch'], inLibrary: false};
const hades2 = {igdbId: 2, name: 'Hades II', year: 2025, imageUrl: null, platforms: ['PC'], inLibrary: false};
const celeste = {igdbId: 3, name: 'Celeste', year: 2018, imageUrl: null, platforms: ['PC', 'PS4'], inLibrary: true};
const row = (lineNo, title, candidates, extra = {}) => ({
    lineNo, title, platform: null, playtimeMinutes: null, status: null, searchFailed: false, exact: true, candidates, ...extra,
});
const ready = {
    id: 5, source: 'TEXT', status: 'READY', total: 3, matched: 3, rows: [
        row(1, 'Hades', [hades, hades2]),
        row(2, 'Celeste', [celeste]),
        row(3, 'Hade', [hades2, hades], {exact: false, playtimeMinutes: 90}),
    ],
};

// routes: 'METHOD path after /imports' -> response or (init) => response; Auth answers the favorite
function renderPage(routes, entry = '/import') {
    fetchRoutes({
        'GET /api/users/me': json(200, {settings: {favoritePlatform: 'Switch'}}),
        ...Object.fromEntries(Object.entries(routes).map(([key, answer]) => {
            const [method, path] = key.split(' ');
            return [`${method} /api/library/imports${path}`,
                typeof answer === 'function' ? (url, init) => answer(init) : answer];
        })),
    });
    render(
        <MemoryRouter initialEntries={[entry]}>
            <Routes>
                <Route path="/import" element={<PreferencesProvider><CurrentUserProvider><ImportPage/></CurrentUserProvider></PreferencesProvider>}/>
                <Route path="/login" element={<p>login</p>}/>
            </Routes>
        </MemoryRouter>,
    );
}

const posted = (method, path) => fetch.mock.calls.find(([url, init]) => init?.method === method && url.endsWith(path));
const polls = (path) => fetch.mock.calls.filter(([url, init]) => !init?.method && url.endsWith(path)).length;
const wait = (ms) => act(() => vi.advanceTimersByTimeAsync(ms));

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

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

describe('initialChoice', () => {
    it('checks only a sure match with a platform', () => {
        expect(initialChoice(ready.rows[0], 'Switch')).toMatchObject({igdbId: 1, platform: 'Switch', checked: true});
        expect(initialChoice(ready.rows[0], null)).toMatchObject({platform: '', checked: false});
        expect(initialChoice(ready.rows[1], 'PC')).toMatchObject({platform: 'PC', checked: false});
        expect(initialChoice(ready.rows[2], 'PC')).toMatchObject({platform: 'PC', checked: false, hours: '1.5'});
        expect(initialChoice(row(4, 'x', []), 'PC')).toMatchObject({igdbId: null, checked: false});
    });
});

describe('stepOf', () => {
    it('maps the status to the step, and a failed import to the step it stopped in', () => {
        expect(stepOf({status: 'QUEUED'})).toBe('QUEUED');
        expect(stepOf({status: 'READY'})).toBe('REVIEW');
        expect(stepOf({status: 'SAVING', step: null})).toBe('SAVING');
        expect(stepOf({status: 'SAVING', step: 'DETAILS'})).toBe('DETAILS');
        expect(stepOf({status: 'FAILED', chosen: 0})).toBe('MATCHING');
        expect(stepOf({status: 'FAILED', chosen: 3})).toBe('SAVING');
        expect(stepOf({status: 'UNDONE'})).toBe('DONE');
    });
});

describe('ImportPage', () => {
    it('shows a queued import with the imports before it', async () => {
        renderPage({
            'GET ': json(200, {imports: []}),
            'GET /8': json(200, {id: 8, source: 'CSV', status: 'QUEUED', total: 40, matched: 0, chosen: 0, saved: 0,
                added: 0, ahead: 2, attempts: 0}),
        }, '/import?id=8');

        expect(await screen.findByText('IMPORT.WAITING:2')).toBeTruthy();
        expect(screen.getByText('IMPORT.STEP.QUEUED').closest('li').getAttribute('aria-current')).toBe('step');
    });

    it('tries a failed import again and polls it', async () => {
        let retried = false;
        renderPage({
            'GET ': json(200, {imports: []}),
            'GET /6': () => json(200, {id: 6, source: 'TEXT', total: 10, matched: retried ? 4 : 2, chosen: 0, saved: 0,
                added: 0, ahead: null, attempts: retried ? 0 : 3, status: retried ? 'MATCHING' : 'FAILED'}),
            'POST /6/retry': () => {
                retried = true;
                return json(202, null);
            },
        }, '/import?id=6');

        expect(await screen.findByText('IMPORT.FAILED:3')).toBeTruthy();
        fireEvent.click(screen.getByRole('button', {name: 'IMPORT.RETRY'}));

        expect(await screen.findByText('IMPORT.MATCHING')).toBeTruthy();
        expect(posted('POST', '/6/retry')).toBeTruthy();
    });

    it('starts an import from the list and shows the progress', async () => {
        renderPage({
            'GET ': json(200, {imports: []}),
            'POST ': json(202, {id: 9}),
            'GET /9': json(200, {id: 9, source: 'TEXT', status: 'MATCHING', total: 2, matched: 1}),
        });
        fireEvent.change(await screen.findByLabelText('IMPORT.TEXT_LABEL'), {target: {value: 'Hades\n\n Celeste \n'}});
        expect(screen.getByText('IMPORT.LINES:2')).toBeTruthy();

        fireEvent.click(screen.getByRole('button', {name: 'IMPORT.START'}));

        expect(await screen.findByText('IMPORT.MATCHING')).toBeTruthy();
        expect(JSON.parse(posted('POST', '/imports')[1].body)).toEqual({
            source: 'TEXT', rows: [{title: 'Hades'}, {title: 'Celeste'}],
        });
    });

    it('polls while matching and then shows the review', async () => {
        let calls = 0;
        renderPage({
            'GET ': json(200, {imports: [{...ready, status: 'MATCHING', rows: null}]}),
            'GET /5': () => (++calls === 1 ? json(200, {...ready, status: 'MATCHING', matched: 1, rows: null}) : json(200, ready)),
        });

        expect(await screen.findByText('IMPORT.MATCHING')).toBeTruthy();
        await wait(2000);
        expect(await screen.findByText('IMPORT.LINE: Hades')).toBeTruthy();
    });

    it('preselects the favorite, checks only sure matches, and saves the checked lines', async () => {
        let saved = false;
        renderPage({
            'GET ': json(200, {imports: []}),
            'GET /5': () => json(200, saved ? {...ready, status: 'SAVED', chosen: 2, saved: 2, added: 1, rows: null} : ready),
            'POST /5/save': () => {
                saved = true;
                return json(202, null);
            },
        }, '/import?id=5');

        const first = await screen.findByLabelText('IMPORT.LINE: Hades');
        await waitFor(() => expect(within(first.closest('li')).getByLabelText('IMPORT.PLATFORM').value).toBe('Switch'));
        expect(first.checked).toBe(true);
        // In the library already, and not the same name.
        expect(screen.getByLabelText('IMPORT.LINE: Celeste').checked).toBe(false);
        const third = screen.getByLabelText('IMPORT.LINE: Hade');
        expect(third.checked).toBe(false);

        const line3 = third.closest('li');
        fireEvent.change(within(line3).getByLabelText('IMPORT.MATCH'), {target: {value: '1'}});
        expect(within(line3).getByLabelText('IMPORT.PLATFORM').value).toBe('Switch');
        fireEvent.change(within(line3).getByLabelText('IMPORT.STATUS_LABEL'), {target: {value: 'PLAYING'}});
        fireEvent.click(third);
        fireEvent.click(screen.getByRole('button', {name: 'IMPORT.SAVE:2'}));

        // The save runs in the background; the page polls until it is done.
        expect(await screen.findByText('IMPORT.DONE')).toBeTruthy();
        expect(JSON.parse(posted('POST', '/5/save')[1].body)).toEqual({rows: [
            {lineNo: 1, igdbId: 1, platform: 'Switch', status: 'BACKLOG', playtimeMinutes: 0},
            {lineNo: 3, igdbId: 1, platform: 'Switch', status: 'PLAYING', playtimeMinutes: 90},
        ]});
    });

    it('checks every line with a new match at once, and none', async () => {
        renderPage({'GET ': json(200, {imports: []}), 'GET /5': json(200, ready)}, '/import?id=5');
        const checked = () => ['Hades', 'Celeste', 'Hade'].map((title) => screen.getByLabelText(`IMPORT.LINE: ${title}`).checked);
        await screen.findByLabelText('IMPORT.LINE: Hades');

        fireEvent.click(screen.getByRole('button', {name: 'IMPORT.SELECT_ALL'}));
        // Celeste is in the library already.
        expect(checked()).toEqual([true, false, true]);
        expect(screen.getByRole('button', {name: 'IMPORT.SAVE:2'})).toBeTruthy();

        fireEvent.click(screen.getByRole('button', {name: 'IMPORT.SELECT_NONE'}));
        expect(checked()).toEqual([false, false, false]);
        expect(screen.getByRole('button', {name: 'IMPORT.SAVE:0'}).disabled).toBe(true);
    });

    it('keeps a line in the library that was checked by hand on select all', async () => {
        renderPage({'GET ': json(200, {imports: []}), 'GET /5': json(200, ready)}, '/import?id=5');
        const celesteBox = await screen.findByLabelText('IMPORT.LINE: Celeste');
        fireEvent.click(celesteBox);
        expect(celesteBox.checked).toBe(true);

        fireEvent.click(screen.getByRole('button', {name: 'IMPORT.SELECT_ALL'}));

        expect(screen.getByLabelText('IMPORT.LINE: Celeste').checked).toBe(true);
    });

    it('undoes a saved import after a confirm with the changed count', async () => {
        renderPage({
            'GET ': json(200, {imports: [{id: 4, source: 'CSV', status: 'SAVED', total: 3, matched: 3, createdAt: '2026-09-29T10:00:00Z'}]}),
            'GET /4/undo-check': json(200, {games: 3, changed: 1}),
            'DELETE /4/games': json(204, null),
        });

        fireEvent.click(await screen.findByRole('button', {name: 'IMPORT.UNDO'}));
        expect(await screen.findByText('IMPORT.UNDO_CONFIRM:3')).toBeTruthy();
        fireEvent.click(screen.getByRole('button', {name: 'IMPORT.UNDO_YES'}));

        await waitFor(() => expect(toast.success).toHaveBeenCalledWith('IMPORT.UNDONE:3'));
        expect(posted('DELETE', '/4/games')).toBeTruthy();
    });

    it('says so when another import is still matching', async () => {
        renderPage({'GET ': json(200, {imports: []}), 'POST ': json(409, {code: 'IMPORT_RUNNING'})});
        fireEvent.change(await screen.findByLabelText('IMPORT.TEXT_LABEL'), {target: {value: 'Hades'}});

        fireEvent.click(screen.getByRole('button', {name: 'IMPORT.START'}));

        await waitFor(() => expect(toast.error).toHaveBeenCalledWith('IMPORT.RUNNING'));
    });

    it('stops polling on a 4xx and says so', async () => {
        renderPage({'GET ': json(200, {imports: []}), 'GET /abc': json(400, null)}, '/import?id=abc');

        expect(await screen.findByText('IMPORT.LOAD_FAILED')).toBeTruthy();
    });

    it('keeps showing an import opened without an id when it leaves the worker', async () => {
        let polls = 0;
        const matching = {id: 5, source: 'TEXT', status: 'MATCHING', total: 3, matched: 1, chosen: 0, saved: 0, added: 0,
            ahead: null, attempts: 0, rows: null};
        renderPage({
            'GET ': () => json(200, {imports: [polls > 1 ? {...ready, rows: null} : matching]}),
            'GET /5': () => (++polls > 1 ? json(200, ready) : json(200, matching)),
        });

        await screen.findByText('IMPORT.MATCHING');
        await wait(2000);
        expect(await screen.findByText('IMPORT.LINE: Hades')).toBeTruthy();
    });

    it('keeps polling after a 502 while Core restarts', async () => {
        let calls = 0;
        renderPage({
            'GET ': json(200, {imports: []}),
            'GET /8': () => (++calls === 1 ? json(502, null) : json(200, {id: 8, source: 'TEXT', status: 'MATCHING',
                total: 4, matched: 1, chosen: 0, saved: 0, added: 0, ahead: null, attempts: 0})),
        }, '/import?id=8');

        await waitFor(() => expect(polls('/8')).toBe(1));
        await wait(4000);
        expect(await screen.findByText('IMPORT.MATCHING')).toBeTruthy();
    });

    it('stops polling after repeated 500', async () => {
        renderPage({'GET ': json(200, {imports: []}), 'GET /8': json(500, null)}, '/import?id=8');

        await waitFor(() => expect(polls('/8')).toBe(1));
        await wait(10 * 30_000);
        expect(screen.getByText('IMPORT.LOAD_FAILED')).toBeTruthy();
        expect(polls('/8')).toBe(10);
        await wait(60_000);
        expect(polls('/8')).toBe(10);
    });

    it('doubles the delay after each failure', async () => {
        renderPage({'GET ': json(200, {imports: []}), 'GET /8': json(503, null)}, '/import?id=8');

        await waitFor(() => expect(polls('/8')).toBe(1));
        await wait(3500);
        expect(polls('/8')).toBe(1);
        await wait(1000);
        expect(polls('/8')).toBe(2);
        await wait(7000);
        expect(polls('/8')).toBe(2);
        await wait(1500);
        expect(polls('/8')).toBe(3);
    });

    it('pauses polling in a hidden tab and goes on when it is visible again', async () => {
        const hidden = vi.spyOn(document, 'hidden', 'get').mockReturnValue(true);
        renderPage({'GET ': json(200, {imports: []}), 'GET /9': json(200, {id: 9, source: 'TEXT', status: 'MATCHING',
            total: 2, matched: 1})}, '/import?id=9');

        await screen.findByText('IMPORT.MATCHING');
        await wait(20_000);
        expect(polls('/9')).toBe(1);

        hidden.mockReturnValue(false);
        await act(async () => document.dispatchEvent(new Event('visibilitychange')));
        expect(polls('/9')).toBe(2);
        await wait(2000);
        expect(polls('/9')).toBe(3);
    });
});

describe('review findings', () => {
    it('shows the review when Auth cannot be reached for the favorite', async () => {
        vi.spyOn(console, 'error').mockImplementation(() => undefined);
        fetchRoutes({
            'GET /api/users/me': () => Promise.reject(new TypeError('Failed to fetch')),
            'GET /api/library/imports': json(200, {imports: []}),
            'GET /api/library/imports/5': json(200, ready),
        });
        render(
            <MemoryRouter initialEntries={['/import?id=5']}>
                <Routes>
                    <Route path="/import" element={<PreferencesProvider><CurrentUserProvider><ImportPage/></CurrentUserProvider></PreferencesProvider>}/>
                </Routes>
            </MemoryRouter>,
        );

        expect(await screen.findByLabelText('IMPORT.LINE: Hades')).toBeTruthy();
    });
});


describe('ImportPage session', () => {
    it('opens the login page on a 401 that the refresh cannot fix, without an error', async () => {
        fetchRoutes({
            'GET /api/users/me': json(200, {settings: {}}),
            'GET /api/library/imports': json(401, {}),
            'POST /api/auth/refresh': json(401, {}),
        });
        const {router} = renderWithProviders(<ImportPage/>, {path: '/import', entries: ['/import'], guarded: true,
            routes: {'/login': <p>login</p>}});

        await waitFor(() => expect(router.state.location.pathname).toBe('/login'));
        expect(router.state.location.state).toEqual({sessionExpired: true, from: '/import'});
        expect(toast.error).not.toHaveBeenCalled();
    });
});