import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';

/**
 * dashboard-store.test — quick-260916-bwo (Marker-Umrechnung) + erweitert um
 * quick-260923-ad9 (Task 3, Dashboard-Reiter).
 *
 * Sechs Tests (1-6) pinnen weiterhin die Anbindung der einmaligen
 * Umrechnung im Store — `loadDashboard`/`selectDashboard` rechnen alte
 * Anordnungen um und speichern SOFORT mit Marker; `saveLayout` traegt den
 * Marker bei JEDEM Speichern (T-BWO-02); der Zustand selbst bleibt
 * markerfrei; `addWidget` legt neue Eintraege in den verdoppelten
 * Vorgabegroessen an. Signaturen sind an die Reiter-Kennung angepasst
 * (`fetchLayout(dashboardId)`, `saveLayout(dashboardId, layouts)`,
 * `addWidget(dashboardId, widgetType)`), das gepruefte Verhalten ist
 * dasselbe.
 *
 * Ab Test 7: Reiter-Verwaltung — Laden holt zuerst die Reiterliste, macht
 * den ersten aktiv und laedt erst danach dessen Inhalt; ein Reiterwechsel
 * schreibt eine ungespeicherte Anordnung zuerst fuer den ALTEN Reiter;
 * Anlegen/Umbenennen/Loeschen pflegen die Reiterliste und den aktiven
 * Reiter.
 */
vi.mock('@/lib/dashboard-api', () => ({
  fetchDashboards: vi.fn(),
  createDashboardTab: vi.fn(),
  renameDashboardTab: vi.fn(),
  deleteDashboardTab: vi.fn(),
  reorderDashboardTabs: vi.fn(),
  fetchLayout: vi.fn(),
  fetchWidgets: vi.fn(),
  saveLayout: vi.fn(),
  addWidget: vi.fn(),
  removeWidget: vi.fn(),
  updateWidgetConfig: vi.fn(),
}));

import * as api from '@/lib/dashboard-api';

const { useDashboardStore } = await import('./dashboard-store');

const EMPTY = { lg: [], md: [], sm: [], xs: [], xxs: [] };
const DASH_1 = { id: 'dash-1', name: 'Dashboard', position: 0 };
const DASH_2 = { id: 'dash-2', name: 'Dashboard 2', position: 1 };

beforeEach(() => {
  useDashboardStore.setState({
    dashboards: [],
    activeDashboardId: null,
    isSwitchingDashboard: false,
    layouts: { lg: [], md: [], sm: [], xs: [], xxs: [] },
    widgets: [],
    isEditMode: false,
    isDirty: false,
    isLoading: false,
    error: null,
  });
  vi.clearAllMocks();
  vi.mocked(api.fetchDashboards).mockResolvedValue([DASH_1]);
  vi.mocked(api.fetchWidgets).mockResolvedValue([]);
  vi.mocked(api.fetchLayout).mockResolvedValue({ ...EMPTY });
  vi.mocked(api.saveLayout).mockResolvedValue(undefined);
});

afterEach(() => {
  vi.restoreAllMocks();
});

describe('dashboard-store — einmalige Umrechnung mit Marker (quick-260916-bwo)', () => {
  it('Test 1: alte Anordnung wird beim Laden umgerechnet und SOFORT fuer den ersten Reiter mit Marker gespeichert', async () => {
    vi.mocked(api.fetchLayout).mockResolvedValue({
      lg: [{ i: 'a', x: 1, y: 1, w: 2, h: 2 }], md: [], sm: [], xs: [], xxs: [],
    });

    await useDashboardStore.getState().loadDashboard();

    const state = useDashboardStore.getState();
    expect(state.layouts.lg[0]).toEqual({ i: 'a', x: 4, y: 2, w: 8, h: 4 });
    expect(Object.keys(state.layouts)).not.toContain('__gridVersion');
    expect(api.saveLayout).toHaveBeenCalledTimes(1);
    expect(api.saveLayout).toHaveBeenCalledWith(
      'dash-1',
      expect.objectContaining({ __gridVersion: 3, lg: [{ i: 'a', x: 4, y: 2, w: 8, h: 4 }] }),
    );
    expect(state.isDirty).toBe(false);
    expect(state.isLoading).toBe(false);
    expect(state.error).toBeNull();
  });

  it('Test 2: markierte Anordnung bleibt unveraendert, kein Speichern, kein Marker im Zustand', async () => {
    vi.mocked(api.fetchLayout).mockResolvedValue({
      lg: [{ i: 'a', x: 1, y: 1, w: 2, h: 2 }], md: [], sm: [], xs: [], xxs: [], __gridVersion: 3,
    });

    await useDashboardStore.getState().loadDashboard();

    const state = useDashboardStore.getState();
    expect(state.layouts.lg[0]).toEqual({ i: 'a', x: 1, y: 1, w: 2, h: 2 });
    expect(api.saveLayout).not.toHaveBeenCalled();
    expect(Object.keys(state.layouts)).not.toContain('__gridVersion');
  });

  it('Test 3: leere Vorgabe-Anordnung ohne Marker -> kein Speichern', async () => {
    vi.mocked(api.fetchLayout).mockResolvedValue({ ...EMPTY });

    await useDashboardStore.getState().loadDashboard();

    expect(api.saveLayout).not.toHaveBeenCalled();
    expect(useDashboardStore.getState().layouts).toEqual(EMPTY);
  });

  it('Test 4: jedes Speichern traegt den Marker (T-BWO-02) unter der aktiven Reiter-Kennung, der Zustand bleibt markerfrei', async () => {
    await useDashboardStore.getState().loadDashboard();
    vi.mocked(api.saveLayout).mockClear();

    const layouts = { lg: [{ i: 'a', x: 2, y: 2, w: 4, h: 4 }], md: [], sm: [], xs: [], xxs: [] };
    useDashboardStore.getState().updateLayouts(layouts);
    expect(useDashboardStore.getState().isDirty).toBe(true);

    await useDashboardStore.getState().saveLayout();

    expect(api.saveLayout).toHaveBeenCalledTimes(1);
    expect(api.saveLayout).toHaveBeenCalledWith(
      'dash-1',
      expect.objectContaining({ __gridVersion: 3, ...layouts }),
    );
    expect(useDashboardStore.getState().isDirty).toBe(false);
    expect(Object.keys(useDashboardStore.getState().layouts)).not.toContain('__gridVersion');
  });

  it('Test 5: scheitert das Sofort-Speichern, bleibt der Zustand umgerechnet, kein Fehlerzustand, console.error einmal', async () => {
    vi.mocked(api.fetchLayout).mockResolvedValue({
      lg: [{ i: 'a', x: 1, y: 1, w: 2, h: 2 }], md: [], sm: [], xs: [], xxs: [],
    });
    vi.mocked(api.saveLayout).mockRejectedValue(new Error('PUT failed'));
    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});

    await expect(useDashboardStore.getState().loadDashboard()).resolves.toBeUndefined();

    const state = useDashboardStore.getState();
    expect(state.layouts.lg[0].x).toBe(4);
    expect(state.error).toBeNull();
    expect(state.isLoading).toBe(false);
    expect(errorSpy).toHaveBeenCalledTimes(1);
  });

  it('Test 6: neues Widget wird in den Vorgabegroessen des 48er-Rasters (quick-260929-dmx) fuer den aktiven Reiter angelegt', async () => {
    await useDashboardStore.getState().loadDashboard();
    vi.mocked(api.addWidget).mockResolvedValue({ id: 'n1', widgetType: 'clock', config: {} });

    await useDashboardStore.getState().addWidget('clock');

    const state = useDashboardStore.getState();
    expect(api.addWidget).toHaveBeenCalledWith('dash-1', 'clock');
    expect(state.layouts.lg).toContainEqual({ i: 'n1', x: 0, y: 0, w: 8, h: 4 });
    expect(state.isDirty).toBe(true);
  });
});

describe('dashboard-store — Reiter laden (quick-260923-ad9, Task 3)', () => {
  it('Test 7: holt zuerst die Reiterliste, macht den ERSTEN aktiv und laedt erst danach dessen Kacheln und Anordnung', async () => {
    vi.mocked(api.fetchDashboards).mockResolvedValue([DASH_1, DASH_2]);
    const callOrder: string[] = [];
    vi.mocked(api.fetchDashboards).mockImplementation(async () => {
      callOrder.push('tabs');
      return [DASH_1, DASH_2];
    });
    vi.mocked(api.fetchLayout).mockImplementation(async () => {
      callOrder.push('layout');
      return { ...EMPTY };
    });
    vi.mocked(api.fetchWidgets).mockImplementation(async () => {
      callOrder.push('widgets');
      return [];
    });

    await useDashboardStore.getState().loadDashboard();

    expect(callOrder[0]).toBe('tabs');
    expect(callOrder.slice(1).sort()).toEqual(['layout', 'widgets']);
    expect(api.fetchLayout).toHaveBeenCalledWith('dash-1');
    expect(api.fetchWidgets).toHaveBeenCalledWith('dash-1');
    expect(useDashboardStore.getState().activeDashboardId).toBe('dash-1');
    expect(useDashboardStore.getState().dashboards).toEqual([DASH_1, DASH_2]);
  });

  it('Test 8: zweimaliges Aufrufen von loadDashboard hintereinander loest nur EINEN Abruf der Reiterliste aus', async () => {
    const first = useDashboardStore.getState().loadDashboard();
    const second = useDashboardStore.getState().loadDashboard();

    await Promise.all([first, second]);

    expect(api.fetchDashboards).toHaveBeenCalledTimes(1);
  });
});

describe('dashboard-store — Reiterwechsel (quick-260923-ad9, Task 3)', () => {
  it('Test 9: ein Wechsel mit ungespeicherter Anordnung schreibt die Anordnung ZUERST fuer den ALTEN Reiter', async () => {
    vi.mocked(api.fetchDashboards).mockResolvedValue([DASH_1, DASH_2]);
    await useDashboardStore.getState().loadDashboard();
    useDashboardStore.getState().updateLayouts({ lg: [{ i: 'x', x: 0, y: 0, w: 1, h: 1 }], md: [], sm: [], xs: [], xxs: [] });
    vi.mocked(api.saveLayout).mockClear();
    vi.mocked(api.fetchLayout).mockResolvedValue({ ...EMPTY });
    vi.mocked(api.fetchWidgets).mockResolvedValue([]);

    await useDashboardStore.getState().selectDashboard('dash-2');

    expect(api.saveLayout).toHaveBeenCalledWith('dash-1', expect.anything());
    expect(useDashboardStore.getState().activeDashboardId).toBe('dash-2');
  });

  it('Test 10: nach dem Wechsel stehen im Zustand AUSSCHLIESSLICH Kacheln und Anordnung des neuen Reiters', async () => {
    vi.mocked(api.fetchDashboards).mockResolvedValue([DASH_1, DASH_2]);
    await useDashboardStore.getState().loadDashboard();

    vi.mocked(api.fetchLayout).mockResolvedValue({
      lg: [{ i: 'only-on-dash-2', x: 0, y: 0, w: 2, h: 2 }], md: [], sm: [], xs: [], xxs: [], __gridVersion: 3,
    });
    vi.mocked(api.fetchWidgets).mockResolvedValue([{ id: 'w-on-dash-2', widgetType: 'clock', config: {} }]);

    await useDashboardStore.getState().selectDashboard('dash-2');

    const state = useDashboardStore.getState();
    expect(state.widgets).toEqual([{ id: 'w-on-dash-2', widgetType: 'clock', config: {} }]);
    expect(state.layouts.lg).toEqual([{ i: 'only-on-dash-2', x: 0, y: 0, w: 2, h: 2 }]);
  });

  it('Test 11: ein Wechsel auf den bereits aktiven Reiter tut nichts', async () => {
    await useDashboardStore.getState().loadDashboard();
    vi.mocked(api.fetchLayout).mockClear();
    vi.mocked(api.fetchWidgets).mockClear();

    await useDashboardStore.getState().selectDashboard('dash-1');

    expect(api.fetchLayout).not.toHaveBeenCalled();
    expect(api.fetchWidgets).not.toHaveBeenCalled();
  });
});

describe('dashboard-store — Reiter anlegen/umbenennen/loeschen (quick-260923-ad9, Task 3)', () => {
  it('Test 12: createDashboard haengt den neuen Reiter hinten an, macht ihn aktiv, die Kachelflaeche ist leer', async () => {
    await useDashboardStore.getState().loadDashboard();
    vi.mocked(api.createDashboardTab).mockResolvedValue(DASH_2);
    vi.mocked(api.fetchLayout).mockResolvedValue({ ...EMPTY });
    vi.mocked(api.fetchWidgets).mockResolvedValue([]);

    await useDashboardStore.getState().createDashboard();

    const state = useDashboardStore.getState();
    expect(state.dashboards.map((d) => d.id)).toEqual(['dash-1', 'dash-2']);
    expect(state.activeDashboardId).toBe('dash-2');
    expect(state.widgets).toEqual([]);
  });

  it('Test 13: renameDashboard aktualisiert den Namen in der Reiterliste', async () => {
    await useDashboardStore.getState().loadDashboard();
    vi.mocked(api.renameDashboardTab).mockResolvedValue({ id: 'dash-1', name: 'Finanzen', position: 0 });

    await useDashboardStore.getState().renameDashboard('dash-1', 'Finanzen');

    expect(useDashboardStore.getState().dashboards[0].name).toBe('Finanzen');
  });

  it('Test 14: deleteDashboard des AKTIVEN Reiters macht den dann ersten verbleibenden Reiter aktiv und laedt dessen Inhalt', async () => {
    vi.mocked(api.fetchDashboards).mockResolvedValue([DASH_1, DASH_2]);
    await useDashboardStore.getState().loadDashboard();
    vi.mocked(api.deleteDashboardTab).mockResolvedValue(undefined);
    vi.mocked(api.fetchLayout).mockResolvedValue({ ...EMPTY });
    vi.mocked(api.fetchWidgets).mockResolvedValue([{ id: 'w-on-dash-2', widgetType: 'clock', config: {} }]);

    await useDashboardStore.getState().deleteDashboard('dash-1');

    const state = useDashboardStore.getState();
    expect(state.dashboards.map((d) => d.id)).toEqual(['dash-2']);
    expect(state.activeDashboardId).toBe('dash-2');
    expect(state.widgets).toEqual([{ id: 'w-on-dash-2', widgetType: 'clock', config: {} }]);
  });

  it('Test 15: deleteDashboard eines INAKTIVEN Reiters aendert den aktiven Reiter nicht', async () => {
    vi.mocked(api.fetchDashboards).mockResolvedValue([DASH_1, DASH_2]);
    await useDashboardStore.getState().loadDashboard();
    vi.mocked(api.deleteDashboardTab).mockResolvedValue(undefined);
    vi.mocked(api.fetchLayout).mockClear();

    await useDashboardStore.getState().deleteDashboard('dash-2');

    expect(useDashboardStore.getState().activeDashboardId).toBe('dash-1');
    expect(useDashboardStore.getState().dashboards.map((d) => d.id)).toEqual(['dash-1']);
    expect(api.fetchLayout).not.toHaveBeenCalled();
  });
});

describe('dashboard-store — Reiter per Ziehen umsortieren (quick-260923-ad9, Task 4)', () => {
  it('Test 16: setzt die neue Reihenfolge SOFORT optimistisch, sendet die vollstaendige Kennungsliste, der aktive Reiter bleibt aktiv', async () => {
    vi.mocked(api.fetchDashboards).mockResolvedValue([DASH_1, DASH_2]);
    await useDashboardStore.getState().loadDashboard();
    vi.mocked(api.reorderDashboardTabs).mockResolvedValue([DASH_2, DASH_1]);

    const promise = useDashboardStore.getState().reorderDashboards(['dash-2', 'dash-1']);

    // Optimistisch VOR der Antwort des Servers gesetzt.
    expect(useDashboardStore.getState().dashboards.map((d) => d.id)).toEqual(['dash-2', 'dash-1']);
    expect(useDashboardStore.getState().activeDashboardId).toBe('dash-1');

    await promise;

    expect(api.reorderDashboardTabs).toHaveBeenCalledWith(['dash-2', 'dash-1']);
    expect(useDashboardStore.getState().dashboards).toEqual([DASH_2, DASH_1]);
    expect(useDashboardStore.getState().activeDashboardId).toBe('dash-1');
  });

  it('Test 17: schlaegt das Speichern fehl, steht die VORHERIGE Reihenfolge wieder im Zustand', async () => {
    vi.mocked(api.fetchDashboards).mockResolvedValue([DASH_1, DASH_2]);
    await useDashboardStore.getState().loadDashboard();
    vi.mocked(api.reorderDashboardTabs).mockRejectedValue(new Error('PUT failed'));
    const errorSpy = vi.spyOn(console, 'error').mockImplementation(() => {});

    await useDashboardStore.getState().reorderDashboards(['dash-2', 'dash-1']);

    expect(useDashboardStore.getState().dashboards).toEqual([DASH_1, DASH_2]);
    expect(errorSpy).toHaveBeenCalledTimes(1);
  });
});