import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
import { MatDialog } from '@angular/material/dialog';
import { Router } from '@angular/router';
import { of } from 'rxjs';
import { EpgRuntimeBridgeService } from '@iptvnator/epg/data-access';
import { selectAllPlaylistsMeta } from '@iptvnator/m3u-state';
import {
    EmbeddedMpvSupport,
    PlaylistMeta,
    Theme,
    VideoPlayer,
} from '@iptvnator/shared/interfaces';
import { MockStore } from '@ngrx/store/testing';
import { SettingsComponent } from './settings.component';
import {
    configureSettingsComponentTestBed,
    createElectronStub,
    createEpgBridgeStub,
    createPlaylistMeta,
    DEFAULT_SETTINGS,
    MockRouter,
    setSettingsSection,
    stubSettingsSideEffects,
} from './test-stubs/settings-test-harness.stub';

/**
 * Page-shell behaviour: chrome, the `:section` page routing, the facade
 * lifecycle and the runtime capabilities that decide which sections and
 * players are offered. Form editing and saving live in
 * `settings.component.form.spec.ts`, and the per-section behaviour in the
 * matching `*.facade.spec.ts` files.
 */
/** Writable double for the bridge's read-only capability getters. */
type EpgBridgeStub = {
    -readonly [K in keyof EpgRuntimeBridgeService]?: EpgRuntimeBridgeService[K];
};

describe('SettingsComponent', () => {
    let component: SettingsComponent;
    let fixture: ComponentFixture<SettingsComponent>;
    let router: Router;
    let mockStore: MockStore;
    let epgBridge: EpgBridgeStub;
    const originalElectron = window.electron;

    beforeEach(waitForAsync(() => {
        epgBridge = createEpgBridgeStub();
        configureSettingsComponentTestBed(epgBridge);
    }));

    beforeEach(() => {
        window.electron = createElectronStub();

        fixture = TestBed.createComponent(SettingsComponent);
        router = TestBed.inject(Router);
        mockStore = TestBed.inject(MockStore);

        component = fixture.componentInstance;
        stubSettingsSideEffects(component);
        fixture.detectChanges();
    });

    afterEach(() => {
        window.electron = originalElectron;
    });

    function setPlaylists(playlists: PlaylistMeta[]): void {
        mockStore.overrideSelector(selectAllPlaylistsMeta, playlists);
        mockStore.refreshState();
        fixture.detectChanges();
    }

    it('should create and init component', () => {
        expect(component).toBeTruthy();
    });

    /**
     * The facades own the behaviour, but only the component knows when to
     * start and stop them — so the seam itself needs coverage here.
     */
    it('drives the facade lifecycle from the page lifecycle', async () => {
        fixture.destroy();

        const lifecycleFixture = TestBed.createComponent(SettingsComponent);
        const lifecycleComponent = lifecycleFixture.componentInstance;
        stubSettingsSideEffects(lifecycleComponent);
        const loadSettings = jest.spyOn(
            lifecycleComponent.form,
            'loadSettings'
        );
        const appUpdateInit = jest.spyOn(lifecycleComponent.appUpdate, 'init');
        const appUpdateDispose = jest.spyOn(
            lifecycleComponent.appUpdate,
            'dispose'
        );
        const embeddedMpvLoad = jest.spyOn(
            lifecycleComponent.embeddedMpv,
            'load'
        );

        lifecycleFixture.detectChanges();
        expect(loadSettings).toHaveBeenCalledTimes(1);
        // Let ngOnInit resume after its native promise, which Zone cannot track.
        await loadSettings.mock.results[0].value;
        await lifecycleFixture.whenStable();

        expect(appUpdateInit).toHaveBeenCalledTimes(1);
        expect(lifecycleComponent.appUpdate.checkAppVersion).toHaveBeenCalled();
        expect(embeddedMpvLoad).toHaveBeenCalled();
        expect(
            lifecycleComponent.remoteControl.fetchLocalIpAddresses
        ).toHaveBeenCalled();
        // The lifecycle really reaches the desktop bridge, not just the facade
        expect(window.electron.getAppUpdateStatus).toHaveBeenCalled();
        expect(window.electron.onAppUpdateStatusChange).toHaveBeenCalled();

        lifecycleFixture.destroy();

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

    it('should render the hidden page header hook', () => {
        const nativeElement = fixture.nativeElement as HTMLElement;

        expect(
            nativeElement.querySelector('[data-test-id="settings-page-header"]')
        ).not.toBeNull();
        expect(nativeElement.querySelector('.settings-intro')).toBeNull();
    });

    describe('Section pages', () => {
        it('renders only the section named by the route param', () => {
            const nativeElement = fixture.nativeElement as HTMLElement;

            expect(
                nativeElement.querySelector('app-settings-general-section')
            ).not.toBeNull();
            expect(
                nativeElement.querySelector('app-settings-playback-section')
            ).toBeNull();

            setSettingsSection('playback');
            fixture.detectChanges();

            expect(
                nativeElement.querySelector('app-settings-general-section')
            ).toBeNull();
            expect(
                nativeElement.querySelector('app-settings-playback-section')
            ).not.toBeNull();
        });

        it('falls back to the general page and rewrites unknown section URLs', () => {
            const navigate = (router as unknown as MockRouter).navigate;

            setSettingsSection('nonsense');
            fixture.detectChanges();

            expect(component.activeSection()).toBe('general');
            expect(navigate).toHaveBeenCalledWith(
                ['/workspace/settings', 'general'],
                { replaceUrl: true }
            );
            expect(
                (fixture.nativeElement as HTMLElement).querySelector(
                    'app-settings-general-section'
                )
            ).not.toBeNull();
        });
    });

    describe('Leaving with unsaved changes', () => {
        const answerDialogWith = (
            choice: 'save' | 'discard' | undefined
        ): jest.Mock => {
            const open = TestBed.inject(MatDialog).open as jest.Mock;
            open.mockReturnValue({ afterClosed: () => of(choice) });
            return open;
        };

        it('lets a pristine form leave without asking', async () => {
            const open = answerDialogWith(undefined);

            await expect(
                component.confirmLeaveWithUnsavedChanges()
            ).resolves.toBe(true);
            expect(open).not.toHaveBeenCalled();
        });

        it('stays when the dialog is dismissed', async () => {
            component.settingsForm.markAsDirty();
            answerDialogWith(undefined);

            await expect(
                component.confirmLeaveWithUnsavedChanges()
            ).resolves.toBe(false);
            expect(component.settingsForm.dirty).toBe(true);
        });

        it('discard-and-leave reverts the staged edits', async () => {
            component.settingsForm.get('theme')?.setValue(Theme.DarkTheme);
            component.settingsForm.markAsDirty();
            answerDialogWith('discard');

            await expect(
                component.confirmLeaveWithUnsavedChanges()
            ).resolves.toBe(true);
            expect(component.settingsForm.pristine).toBe(true);
        });

        it('save-and-leave persists before allowing the navigation', async () => {
            component.settingsForm.markAsDirty();
            jest.spyOn(
                component.epg,
                'fetchConfiguredEpg'
            ).mockImplementation();
            answerDialogWith('save');

            await expect(
                component.confirmLeaveWithUnsavedChanges()
            ).resolves.toBe(true);
            expect(component.settingsForm.pristine).toBe(true);
        });

        it('offers save-and-leave only while the form is valid', async () => {
            component.settingsForm.markAsDirty();
            component.settingsForm.setErrors({ invalid: true });
            const open = answerDialogWith(undefined);

            await component.confirmLeaveWithUnsavedChanges();

            expect(open).toHaveBeenCalledWith(
                expect.anything(),
                expect.objectContaining({
                    data: { canSave: false },
                })
            );
        });
    });

    it('enables the global wipe action only once a playlist exists', () => {
        setSettingsSection('backup');
        fixture.detectChanges();

        const deleteButton = () =>
            (fixture.nativeElement as HTMLElement).querySelector(
                '.danger-zone__button'
            ) as HTMLButtonElement | null;

        setPlaylists([]);

        expect(component.playlistReset.canRemoveAll()).toBe(false);
        expect(deleteButton()?.disabled).toBe(true);

        setPlaylists([createPlaylistMeta({ _id: 'm3u-1' })]);

        expect(component.playlistReset.canRemoveAll()).toBe(true);
        expect(deleteButton()?.disabled).toBe(false);
    });

    describe('Runtime capabilities', () => {
        it('hides the embedded mpv option when the desktop support probe reports unsupported', async () => {
            window.electron = {
                ...window.electron,
                getEmbeddedMpvSupport: jest.fn().mockResolvedValue({
                    supported: false,
                    platform: 'darwin',
                    reason: 'hidden harness',
                }),
            } as unknown as typeof window.electron;

            await component.ngOnInit();
            await fixture.whenStable();

            expect(
                component
                    .players()
                    .some((player) => player.id === VideoPlayer.EmbeddedMpv)
            ).toBe(false);
        });

        it.each(['darwin', 'win32', 'linux'] as const)(
            'shows the embedded mpv option when the %s desktop support probe reports supported',
            async (platform) => {
                window.electron = {
                    ...window.electron,
                    getEmbeddedMpvSupport: jest.fn().mockResolvedValue({
                        supported: true,
                        platform,
                    }),
                } as unknown as typeof window.electron;

                await component.ngOnInit();
                await fixture.whenStable();

                expect(
                    component
                        .players()
                        .some((player) => player.id === VideoPlayer.EmbeddedMpv)
                ).toBe(true);
            }
        );

        it('does not block settings initialization while embedded mpv support is pending', async () => {
            let resolveSupport:
                ((value: EmbeddedMpvSupport) => void) | undefined;
            window.electron = {
                ...window.electron,
                getEmbeddedMpvSupport: jest.fn(
                    () =>
                        new Promise((resolve) => {
                            resolveSupport = resolve;
                        })
                ),
            } as unknown as typeof window.electron;

            await expect(component.ngOnInit()).resolves.toBeUndefined();

            expect(component.settingsForm.value).toEqual(DEFAULT_SETTINGS);
            expect(window.electron.getEmbeddedMpvSupport).toHaveBeenCalled();
            expect(
                component
                    .players()
                    .some((player) => player.id === VideoPlayer.EmbeddedMpv)
            ).toBe(false);

            if (!resolveSupport) {
                throw new Error('Expected embedded MPV support probe to start');
            }

            resolveSupport({
                supported: true,
                platform: 'darwin',
            });
            await fixture.whenStable();

            expect(
                component
                    .players()
                    .some((player) => player.id === VideoPlayer.EmbeddedMpv)
            ).toBe(true);
        });

        it('hides external player path settings when the Electron bridge is incomplete', () => {
            fixture.destroy();
            epgBridge.supportsImport = false;
            window.electron = {
                getAppVersion: jest.fn().mockResolvedValue('1.0.0'),
                platform: 'linux',
                updateSettings: jest.fn().mockResolvedValue(undefined),
            } as unknown as typeof window.electron;

            const partialBridgeFixture =
                TestBed.createComponent(SettingsComponent);
            const partialBridgeComponent =
                partialBridgeFixture.componentInstance;
            stubSettingsSideEffects(partialBridgeComponent);
            partialBridgeFixture.detectChanges();

            expect(partialBridgeComponent.isDesktop).toBe(true);
            expect(partialBridgeComponent.supportsManagedExternalPlayers).toBe(
                false
            );
            expect(
                partialBridgeComponent.supportsExternalPlayerPathSettings
            ).toBe(false);
            expect(partialBridgeComponent.supportsEpg).toBe(false);
            expect(partialBridgeComponent.supportsRemoteControl).toBe(false);
            expect(
                partialBridgeComponent.settingsForm.get('epgUrl')
            ).toBeNull();
            expect(
                partialBridgeComponent.sectionNav.find(
                    (section) => section.id === 'epg'
                )
            ).toBeUndefined();
            expect(
                partialBridgeComponent.sectionNav.find(
                    (section) => section.id === 'remote-control'
                )
            ).toBeUndefined();
            expect(
                partialBridgeComponent
                    .players()
                    .some((player) => player.id === VideoPlayer.MPV)
            ).toBe(false);
            expect(
                partialBridgeComponent
                    .players()
                    .some((player) => player.id === VideoPlayer.VLC)
            ).toBe(false);
        });

        it('keeps external player choices when launch support exists without path settings', () => {
            fixture.destroy();
            window.electron = {
                getAppVersion: jest.fn().mockResolvedValue('1.0.0'),
                openInMpv: jest.fn(),
                openInVlc: jest.fn(),
                platform: 'linux',
                updateSettings: jest.fn().mockResolvedValue(undefined),
            } as unknown as typeof window.electron;

            const launchOnlyBridgeFixture =
                TestBed.createComponent(SettingsComponent);
            const launchOnlyBridgeComponent =
                launchOnlyBridgeFixture.componentInstance;
            stubSettingsSideEffects(launchOnlyBridgeComponent);
            launchOnlyBridgeFixture.detectChanges();

            expect(
                launchOnlyBridgeComponent.supportsManagedExternalPlayers
            ).toBe(true);
            expect(
                launchOnlyBridgeComponent.supportsExternalPlayerPathSettings
            ).toBe(false);
            expect(
                launchOnlyBridgeComponent
                    .players()
                    .some((player) => player.id === VideoPlayer.MPV)
            ).toBe(true);
            expect(
                launchOnlyBridgeComponent
                    .players()
                    .some((player) => player.id === VideoPlayer.VLC)
            ).toBe(true);
        });

        it('opens the playlist folder picker only when the desktop bridge offers one', async () => {
            const selectFolder = jest.fn().mockResolvedValue('/tmp/recordings');
            window.electron = {
                ...window.electron,
                selectEmbeddedMpvRecordingFolder: selectFolder,
            } as unknown as typeof window.electron;

            await component.selectRecordingFolder();

            expect(selectFolder).toHaveBeenCalled();
            expect(component.settingsForm.value.recordingFolder).toBe(
                '/tmp/recordings'
            );
            expect(component.settingsForm.dirty).toBe(true);
        });
    });
});