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

vi.mock('$env/dynamic/private', () => ({
	env: { BACKEND_URL: 'http://localhost:8080' }
}));

const mockGet = vi.fn();
const mockPost = vi.fn();
vi.mock('$lib/server/api', () => ({
	apiClient: () => ({ GET: mockGet, POST: mockPost })
}));

describe('planner page — load', () => {
	let load: any;

	beforeEach(async () => {
		mockGet.mockReset();
		mockPost.mockReset();
		vi.resetModules();
		const mod = await import('./+page.server');
		load = mod.load;
	});

	const mockWeekPlan = {
		id: 'plan-1',
		weekStart: '2026-03-30',
		status: 'draft',
		slots: [
			{ id: 's1', slotDate: '2026-03-30', recipe: { id: 'r1', name: 'Pasta', effort: 'Easy', cookTimeMin: 30 } },
			{ id: 's2', slotDate: '2026-03-31', recipe: { id: 'r2', name: 'Curry', effort: 'Medium', cookTimeMin: 45 } }
		]
	};

	it('fetches week plan for the current week by default', async () => {
		mockGet.mockResolvedValueOnce({ data: mockWeekPlan, error: undefined });
		mockGet.mockResolvedValueOnce({
			data: { score: 7.5, ingredientOverlaps: [], tagRepeats: [], recentRepeats: [], duplicatesInPlan: [] },
			error: undefined
		});
		const url = new URL('http://localhost/planner');
		await load({ fetch: vi.fn(), url });
		expect(mockGet).toHaveBeenCalledWith('/v1/week-plans', expect.objectContaining({ params: expect.objectContaining({ query: expect.objectContaining({ weekStart: expect.any(String) }) }) }));
	});

	it('uses weekStart from URL search params if provided', async () => {
		mockGet.mockResolvedValueOnce({ data: mockWeekPlan, error: undefined });
		mockGet.mockResolvedValueOnce({ data: { score: 8 }, error: undefined });
		const url = new URL('http://localhost/planner?week=2026-03-30');
		await load({ fetch: vi.fn(), url });
		expect(mockGet).toHaveBeenCalledWith('/v1/week-plans', expect.objectContaining({ params: expect.objectContaining({ query: { weekStart: '2026-03-30' } }) }));
	});

	it('returns weekPlan with slots in page data', async () => {
		mockGet.mockResolvedValueOnce({ data: mockWeekPlan, error: undefined });
		mockGet.mockResolvedValueOnce({ data: { score: 7.5 }, error: undefined });
		const url = new URL('http://localhost/planner');
		const result = await load({ fetch: vi.fn(), url });
		expect(result.weekPlan).toBeDefined();
		expect(result.weekPlan.id).toBe('plan-1');
		expect(result.weekPlan.slots).toHaveLength(2);
	});

	it('returns variety score in page data', async () => {
		mockGet.mockResolvedValueOnce({ data: mockWeekPlan, error: undefined });
		mockGet.mockResolvedValueOnce({ data: { score: 7.5, ingredientOverlaps: [{ ingredientName: 'Tomate', days: ['2026-03-30', '2026-03-31'] }] }, error: undefined });
		const url = new URL('http://localhost/planner');
		const result = await load({ fetch: vi.fn(), url });
		expect(result.varietyScore.score).toBe(7.5);
		expect(result.varietyScore.ingredientOverlaps).toHaveLength(1);
	});

	it('returns null weekPlan when API returns 404', async () => {
		mockGet.mockResolvedValueOnce({ data: undefined, error: { status: 404 } });
		const url = new URL('http://localhost/planner');
		const result = await load({ fetch: vi.fn(), url });
		expect(result.weekPlan).toBeNull();
		expect(result.varietyScore).toBeNull();
	});

	it('returns the weekStart used for the query', async () => {
		mockGet.mockResolvedValueOnce({ data: mockWeekPlan, error: undefined });
		mockGet.mockResolvedValueOnce({ data: { score: 6 }, error: undefined });
		const url = new URL('http://localhost/planner?week=2026-03-30');
		const result = await load({ fetch: vi.fn(), url });
		expect(result.weekStart).toBe('2026-03-30');
	});

	it('creates week plan if not found and fetches variety score after creation', async () => {
		// When no plan exists (404), load should return null weekPlan — creation is done via a POST action, not in load
		mockGet.mockResolvedValueOnce({ data: undefined, error: { status: 404 } });
		const url = new URL('http://localhost/planner');
		const result = await load({ fetch: vi.fn(), url });
		expect(result.weekPlan).toBeNull();
	});
});

describe('planner page — actions', () => {
	let actions: any;

	beforeEach(async () => {
		mockGet.mockReset();
		mockPost.mockReset();
		vi.resetModules();
		const mod = await import('./+page.server');
		actions = mod.actions;
	});

	it('createPlan action calls POST /v1/week-plans', async () => {
		mockPost.mockResolvedValue({ data: { id: 'plan-new', weekStart: '2026-03-30', slots: [] }, error: undefined });
		const formData = new FormData();
		formData.set('weekStart', '2026-03-30');
		const result = await actions.createPlan({
			fetch: vi.fn(),
			request: { formData: async () => formData },
			locals: { benutzer: { id: 'u1', name: 'Test', rolle: 'planer' }, haushalt: { id: 'h1', name: 'Test' } }
		});
		expect(mockPost).toHaveBeenCalledWith('/v1/week-plans', expect.objectContaining({ body: { weekStart: '2026-03-30' } }));
		expect(result).toEqual({ success: true });
	});

	it('createPlan action returns error when API fails', async () => {
		mockPost.mockResolvedValue({ data: undefined, error: { message: 'Server error' } });
		const formData = new FormData();
		formData.set('weekStart', '2026-03-30');
		const result = await actions.createPlan({
			fetch: vi.fn(),
			request: { formData: async () => formData },
			locals: { benutzer: { id: 'u1', name: 'Test', rolle: 'planer' }, haushalt: { id: 'h1', name: 'Test' } }
		});
		expect(result).toEqual({ success: false, error: expect.any(String) });
	});

	it('createPlan action returns error for invalid weekStart format', async () => {
		const formData = new FormData();
		formData.set('weekStart', 'not-a-date');
		const result = await actions.createPlan({
			fetch: vi.fn(),
			request: { formData: async () => formData },
			locals: { benutzer: { id: 'u1', name: 'Test', rolle: 'planer' }, haushalt: { id: 'h1', name: 'Test' } }
		});
		expect(result).toEqual({ success: false, error: 'Ungültiges Datum.' });
		expect(mockPost).not.toHaveBeenCalled();
	});

	it('createPlan action returns error when weekStart is missing', async () => {
		const formData = new FormData();
		const result = await actions.createPlan({
			fetch: vi.fn(),
			request: { formData: async () => formData },
			locals: { benutzer: { id: 'u1', name: 'Test', rolle: 'planer' }, haushalt: { id: 'h1', name: 'Test' } }
		});
		expect(result).toEqual({ success: false, error: 'Ungültiges Datum.' });
	});

	it('createPlan action returns permission error for member role', async () => {
		const formData = new FormData();
		formData.set('weekStart', '2026-03-30');
		const result = await actions.createPlan({
			fetch: vi.fn(),
			request: { formData: async () => formData },
			locals: { benutzer: { id: 'u1', name: 'Test', rolle: 'mitglied' }, haushalt: { id: 'h1', name: 'Test' } }
		});
		expect(result).toEqual({ success: false, error: 'Keine Berechtigung.' });
		expect(mockPost).not.toHaveBeenCalled();
	});
});

describe('planner page — variety score partial failure', () => {
	let load: any;

	beforeEach(async () => {
		mockGet.mockReset();
		mockPost.mockReset();
		vi.resetModules();
		const mod = await import('./+page.server');
		load = mod.load;
	});

	const mockWeekPlan = {
		id: 'plan-1',
		weekStart: '2026-03-30',
		status: 'draft',
		slots: []
	};

	it('returns weekPlan even when variety score API fails', async () => {
		mockGet.mockResolvedValueOnce({ data: mockWeekPlan, error: undefined });
		mockGet.mockResolvedValueOnce({ data: undefined, error: { status: 500 } });
		const url = new URL('http://localhost/planner');
		const result = await load({ fetch: vi.fn(), url });
		expect(result.weekPlan).toBeDefined();
		expect(result.weekPlan.id).toBe('plan-1');
		expect(result.varietyScore).toBeNull();
	});
});