// @vitest-environment jsdom
import {afterEach, beforeEach, describe, expect, it, vi} from 'vitest';
import {act, cleanup, renderHook} from '@testing-library/react';
import {MemoryRouter, Route, Routes} from 'react-router-dom';
import {toast} from 'sonner';
import {PreferencesProvider, usePreferences} from '../context/PreferencesContext.jsx';
import useSaveAppearance from './useSaveAppearance.js';
import RequireSession from '../components/RequireSession.jsx';
import {DEFAULT_APPEARANCE} from '../utils/appearance.js';

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

// RequireSession ends the session on a 401, as on the pages that use the hook.
const wrapper = ({children}) => (
    <MemoryRouter><PreferencesProvider>
        <Routes><Route element={<RequireSession/>}><Route path="*" element={children}/></Route></Routes>
    </PreferencesProvider></MemoryRouter>
);

const renderSave = () => renderHook(() => ({save: useSaveAppearance(), preferences: usePreferences()}), {wrapper});

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

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

describe('useSaveAppearance', () => {
    it('applies the change at once and sends the whole appearance', async () => {
        globalThis.fetch = vi.fn(async () => ({ok: true, status: 204}));
        const {result} = renderSave();

        let saved;
        await act(async () => {
            saved = await result.current.save({accent: 'blue'});
        });

        expect(saved).toBe(true);
        expect(result.current.preferences.appearance.accent).toBe('blue');
        expect(document.documentElement.dataset.accent).toBe('blue');
        const [url, request] = fetch.mock.calls[0];
        expect(url).toContain('/api/users/settings/appearance');
        expect(request.method).toBe('PUT');
        expect(JSON.parse(request.body)).toEqual({accent: 'blue', corners: 'default', wideLayout: false, backgroundAppid: null, bannerAppid: null, showBanner: true});
    });

    it('puts the old value back when Auth refuses', async () => {
        globalThis.fetch = vi.fn(async () => ({ok: false, status: 400}));
        const {result} = renderSave();

        await act(async () => {
            await result.current.save({corners: 'round'});
        });

        expect(result.current.preferences.appearance.corners).toBe('default');
        expect(toast.error).toHaveBeenCalledWith('SETTINGS.ERROR_SAVE');
    });

    it('keeps a later change when an earlier save fails', async () => {
        let failFirst;
        globalThis.fetch = vi.fn()
            .mockImplementationOnce(() => new Promise((resolve) => {
                failFirst = () => resolve({ok: false, status: 500});
            }))
            .mockImplementation(async () => ({ok: true, status: 204}));
        const {result} = renderSave();

        let first;
        let second;
        await act(async () => {
            first = result.current.save({accent: 'green'});
        });
        await act(async () => {
            second = result.current.save({accent: 'pink'});
        });
        await act(async () => {
            failFirst();
            await first;
            await second;
        });

        expect(result.current.preferences.appearance.accent).toBe('pink');
        expect(JSON.parse(fetch.mock.calls[1][1].body).accent).toBe('pink');
    });

    it('ends the session on a 401', async () => {
        globalThis.fetch = vi.fn(async () => ({ok: false, status: 401}));
        const {result} = renderSave();

        await act(async () => {
            await result.current.save({wideLayout: true});
        });

        expect(localStorage.getItem('tbp_jwt')).toBeNull();
    });

    it('ends the session with the default look on a 401, so the next user does not get this one', async () => {
        localStorage.setItem('tbp_appearance', JSON.stringify({accent: 'green', corners: 'round', wideLayout: true, backgroundAppid: 620}));
        globalThis.fetch = vi.fn(async () => ({ok: false, status: 401}));
        const {result} = renderSave();

        await act(async () => {
            await result.current.save({corners: 'sharp'});
        });

        expect(result.current.preferences.appearance).toEqual(DEFAULT_APPEARANCE);
        expect(JSON.parse(localStorage.getItem('tbp_appearance'))).toEqual(DEFAULT_APPEARANCE);
    });

    it('waits for a running load from Auth, then keeps its values for the fields not changed here', async () => {
        const fromServer = {accent: 'green', corners: 'default', wideLayout: false, backgroundAppid: null, bannerAppid: 620, showBanner: false};
        let answerMe;
        globalThis.fetch = vi.fn((url, init) => (init?.method === 'PUT'
            ? Promise.resolve({ok: true, status: 204})
            : new Promise((resolve) => {
                answerMe = () => resolve({ok: true, status: 200, json: async () => ({settings: {appearance: fromServer}})});
            })));
        const {result} = renderSave();

        let sync;
        let save;
        act(() => {
            sync = result.current.preferences.syncPreferences();
        });
        act(() => {
            save = result.current.save({corners: 'round'});
        });
        expect(result.current.preferences.appearance.corners).toBe('round');
        expect(fetch.mock.calls.some(([, init]) => init?.method === 'PUT')).toBe(false);

        await act(async () => {
            answerMe();
            await sync;
            await save;
        });

        expect(result.current.preferences.appearance).toEqual({...fromServer, corners: 'round'});
        const [, put] = fetch.mock.calls.find(([, init]) => init?.method === 'PUT');
        expect(JSON.parse(put.body)).toEqual({...fromServer, corners: 'round'});
    });

    it('does not bring back the look of the user before after a reset', async () => {
        let answerMe;
        globalThis.fetch = vi.fn(() => new Promise((resolve) => {
            answerMe = () => resolve({ok: true, status: 200, json: async () => ({settings: {appearance: {accent: 'red', corners: 'sharp'}}})});
        }));
        const {result} = renderSave();

        let sync;
        act(() => {
            sync = result.current.preferences.syncPreferences();
        });
        act(() => result.current.preferences.resetAppearance());
        await act(async () => {
            answerMe();
            await sync;
        });

        expect(result.current.preferences.appearance).toEqual(DEFAULT_APPEARANCE);
    });

    it('sends saves one at a time, so a later save never carries an older value', async () => {
        const answers = [];
        globalThis.fetch = vi.fn((url, init) => (init?.method === 'PUT'
            ? new Promise((resolve) => answers.push(() => resolve({ok: true, status: 204})))
            : Promise.resolve({ok: true, status: 200, json: async () => ({})})));
        const puts = () => fetch.mock.calls.filter(([, init]) => init?.method === 'PUT').map(([, init]) => JSON.parse(init.body));
        const {result} = renderSave();

        let first;
        let second;
        await act(async () => {
            first = result.current.save({accent: 'green'});
        });
        await act(async () => {
            second = result.current.save({corners: 'round'});
        });
        expect(puts()).toHaveLength(1);

        await act(async () => {
            answers[0]();
            await first;
        });
        await act(async () => {
            answers[1]();
            await second;
        });
        let third;
        await act(async () => {
            third = result.current.save({wideLayout: true});
        });
        await act(async () => {
            answers[2]();
            await third;
        });

        expect(result.current.preferences.appearance.corners).toBe('round');
        expect(puts()[2]).toEqual({accent: 'green', corners: 'round', wideLayout: true, backgroundAppid: null, bannerAppid: null, showBanner: true});
    });

    it('sends nothing for a change that waited for the load when a reset came first', async () => {
        let answerMe;
        globalThis.fetch = vi.fn((url, init) => (init?.method === 'PUT'
            ? Promise.resolve({ok: true, status: 204})
            : new Promise((resolve) => {
                answerMe = () => resolve({ok: true, status: 200, json: async () => ({})});
            })));
        const {result} = renderSave();

        act(() => {
            result.current.preferences.syncPreferences();
        });
        let save;
        act(() => {
            save = result.current.save({accent: 'green'});
        });
        act(() => result.current.preferences.resetAppearance());
        await act(async () => {
            answerMe();
            await save;
        });

        expect(fetch.mock.calls.some(([, init]) => init?.method === 'PUT')).toBe(false);
        expect(result.current.preferences.appearance).toEqual(DEFAULT_APPEARANCE);
    });
});