import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
import { MatDialog } from '@angular/material/dialog';
import { MatSnackBar } from '@angular/material/snack-bar';
import { EpgRuntimeBridgeService } from '@iptvnator/epg/data-access';
import { SettingsStore } from '../services/settings-store.service';
import { SettingsComponent } from './settings.component';
import {
    configureSettingsComponentTestBed,
    createElectronStub,
    createEpgBridgeStub,
    MatSnackBarStub,
    MockSettingsStore,
    stubSettingsSideEffects,
} from './test-stubs/settings-test-harness.stub';

/** Matches the snackbar config used by `SettingsSnackbarService.error`. */
const ERROR_SNACKBAR_CONFIG = expect.objectContaining({
    panelClass: ['settings-snackbar', 'settings-snackbar--error'],
});

/**
 * Assertions target the MatDialog the component actually calls: spying on the
 * one returned by `TestBed.inject(MatDialog)` does not observe it.
 */
interface SettingsComponentPrivateTestApi {
    matDialog: MatDialog;
}

/**
 * Settings live in the renderer's IndexedDB, and both halves of the round trip
 * can fail while the UI keeps looking healthy: a failed read shows defaults as
 * if they were saved, and a failed write is applied in memory so it survives
 * until the next restart. These cover the user-visible reporting of both.
 */
describe('SettingsComponent storage failures', () => {
    let component: SettingsComponent;
    let fixture: ComponentFixture<SettingsComponent>;
    let settingsStore: MockSettingsStore;
    let snackBar: MatSnackBarStub;
    let epgBridge: Partial<EpgRuntimeBridgeService>;
    const originalElectron = window.electron;
    const componentMatDialog = (): MatDialog =>
        (component as unknown as SettingsComponentPrivateTestApi).matDialog;

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

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

        fixture = TestBed.createComponent(SettingsComponent);
        settingsStore = TestBed.inject(
            SettingsStore
        ) as unknown as MockSettingsStore;
        snackBar = TestBed.inject(MatSnackBar) as unknown as MatSnackBarStub;

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

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

    it('warns when the persisted settings could not be read', async () => {
        settingsStore.storageFailure.set('load');

        await component.ngOnInit();

        expect(snackBar.open).toHaveBeenCalledWith(
            'SETTINGS.SETTINGS_LOAD_FAILED',
            'CLOSE',
            ERROR_SNACKBAR_CONFIG
        );
    });

    it('warns and keeps the dialog open when the settings write fails', async () => {
        settingsStore.updateSettings.mockRejectedValue(
            new Error('storage unavailable')
        );
        const closeAll = jest.spyOn(componentMatDialog(), 'closeAll');
        component.isDialog = true;

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

        expect(snackBar.open).toHaveBeenCalledWith(
            'SETTINGS.SETTINGS_SAVE_FAILED',
            'CLOSE',
            ERROR_SNACKBAR_CONFIG
        );
        expect(closeAll).not.toHaveBeenCalled();
    });

    it('closes the dialog only after the settings write succeeded', async () => {
        settingsStore.updateSettings.mockResolvedValue(undefined);
        const closeAll = jest.spyOn(componentMatDialog(), 'closeAll');
        jest.spyOn(component.epg, 'fetchConfiguredEpg').mockImplementation();
        component.isDialog = true;

        component.onSubmit();
        // save() resolves a tick after the store write: the callback and
        // the Electron mirror run first, so the close lands on the next
        // turn of the microtask queue.
        await fixture.whenStable();
        await fixture.whenStable();

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

    it('warns when a section write fails without leaving an unhandled rejection', async () => {
        settingsStore.updateSettings.mockRejectedValue(
            new Error('storage unavailable')
        );

        component.form.selectCoverSize('large');
        await fixture.whenStable();

        expect(snackBar.open).toHaveBeenCalledWith(
            'SETTINGS.SETTINGS_SAVE_FAILED',
            'CLOSE',
            ERROR_SNACKBAR_CONFIG
        );
    });
});