import { describe, it, expect, vi, afterEach, beforeEach } from 'vitest';
import { cleanup, render } from 'vitest-browser-svelte';
import { page } from 'vitest/browser';
import AdminSystemPage from './+page.svelte';

afterEach(cleanup);

describe('admin/system page', () => {
	let fetchSpy: ReturnType<typeof vi.spyOn>;

	beforeEach(() => {
		fetchSpy = vi.spyOn(globalThis, 'fetch').mockResolvedValue(
			new Response(
				JSON.stringify({
					state: 'IDLE',
					message: '',
					total: 0,
					processed: 0,
					skipped: 0,
					failed: 0
				}),
				{ status: 200, headers: { 'Content-Type': 'application/json' } }
			)
		);
	});

	afterEach(() => {
		fetchSpy?.mockRestore();
	});

	it('renders the backfill versions card', async () => {
		render(AdminSystemPage, { props: {} });

		await expect
			.element(page.getByRole('heading', { name: /verlaufsdaten auffüllen/i }))
			.toBeVisible();
	});

	it('renders the backfill versions button enabled by default', async () => {
		render(AdminSystemPage, { props: {} });

		const btn = (await page
			.getByRole('button', { name: /jetzt auffüllen/i })
			.element()) as HTMLButtonElement;
		expect(btn.disabled).toBe(false);
	});

	it('renders the backfill file-hashes card', async () => {
		render(AdminSystemPage, { props: {} });

		await expect
			.element(page.getByRole('heading', { name: /datei-hashes berechnen/i }))
			.toBeVisible();
	});

	it('renders the backfill file-hashes button enabled by default', async () => {
		render(AdminSystemPage, { props: {} });

		const btn = (await page
			.getByRole('button', { name: /datei-hashes berechnen/i })
			.element()) as HTMLButtonElement;
		expect(btn.disabled).toBe(false);
	});

	it('does not render the backfill success banner before any action', async () => {
		render(AdminSystemPage, { props: {} });

		const banners = document.querySelectorAll('.bg-green-50');
		expect(banners.length).toBe(0);
	});

	it('triggers backfill versions when its button is clicked', async () => {
		fetchSpy.mockResolvedValueOnce(
			new Response(JSON.stringify({ count: 7 }), {
				status: 200,
				headers: { 'Content-Type': 'application/json' }
			})
		);

		render(AdminSystemPage, { props: {} });

		const btn = (await page
			.getByRole('button', { name: /jetzt auffüllen/i })
			.element()) as HTMLButtonElement;
		btn.click();

		await new Promise((r) => setTimeout(r, 50));
		const calls = fetchSpy.mock.calls.map((c) => c[0].toString());
		expect(calls.some((c) => c.includes('backfill-versions'))).toBe(true);
	});

	it('triggers file-hashes backfill when its button is clicked', async () => {
		render(AdminSystemPage, { props: {} });

		const btn = (await page
			.getByRole('button', { name: /datei-hashes berechnen/i })
			.element()) as HTMLButtonElement;
		btn.click();

		await new Promise((r) => setTimeout(r, 50));
		const calls = fetchSpy.mock.calls.map((c) => c[0].toString());
		expect(calls.some((c) => c.includes('backfill-file-hashes'))).toBe(true);
	});

	it('initial fetch loads import-status and thumbnail-status', async () => {
		render(AdminSystemPage, { props: {} });

		await new Promise((r) => setTimeout(r, 50));
		const calls = fetchSpy.mock.calls.map((c) => c[0].toString());
		expect(calls.some((c) => c.includes('import-status'))).toBe(true);
		expect(calls.some((c) => c.includes('thumbnail-status'))).toBe(true);
	});

	it('shows the success banner after backfill versions completes', async () => {
		fetchSpy.mockImplementation(async (url: RequestInfo | URL) => {
			const u = url.toString();
			if (u.includes('backfill-versions')) {
				return new Response(JSON.stringify({ count: 12 }), {
					status: 200,
					headers: { 'Content-Type': 'application/json' }
				});
			}
			return new Response(JSON.stringify({ state: 'IDLE' }), {
				status: 200,
				headers: { 'Content-Type': 'application/json' }
			});
		});

		render(AdminSystemPage, { props: {} });

		const btn = (await page
			.getByRole('button', { name: /jetzt auffüllen/i })
			.element()) as HTMLButtonElement;
		btn.click();

		await new Promise((r) => setTimeout(r, 100));
		const banner = document.querySelector('.bg-green-50');
		expect(banner).not.toBeNull();
	});

	it('renders the running state for import-status', async () => {
		fetchSpy.mockImplementation(async (url: RequestInfo | URL) => {
			const u = url.toString();
			if (u.includes('import-status')) {
				return new Response(
					JSON.stringify({ state: 'RUNNING', message: '', processed: 0, startedAt: null }),
					{ status: 200, headers: { 'Content-Type': 'application/json' } }
				);
			}
			return new Response(JSON.stringify({ state: 'IDLE' }), {
				status: 200,
				headers: { 'Content-Type': 'application/json' }
			});
		});

		render(AdminSystemPage, { props: {} });

		await new Promise((r) => setTimeout(r, 100));
		expect(document.body.textContent).toMatch(/läuft|wird ausgeführt/i);
	});

	it('renders the DONE state with processed count for import-status', async () => {
		fetchSpy.mockImplementation(async (url: RequestInfo | URL) => {
			const u = url.toString();
			if (u.includes('import-status')) {
				return new Response(
					JSON.stringify({ state: 'DONE', message: '', processed: 99, startedAt: null }),
					{ status: 200, headers: { 'Content-Type': 'application/json' } }
				);
			}
			return new Response(JSON.stringify({ state: 'IDLE' }), {
				status: 200,
				headers: { 'Content-Type': 'application/json' }
			});
		});

		render(AdminSystemPage, { props: {} });

		await new Promise((r) => setTimeout(r, 100));
		expect(document.body.textContent).toContain('99');
	});

	it('renders the FAILED state with the error message for thumbnail-status', async () => {
		fetchSpy.mockImplementation(async (url: RequestInfo | URL) => {
			const u = url.toString();
			if (u.includes('thumbnail-status')) {
				return new Response(
					JSON.stringify({
						state: 'FAILED',
						message: 'connection refused',
						total: 0,
						processed: 0,
						skipped: 0,
						failed: 0,
						startedAt: null
					}),
					{ status: 200, headers: { 'Content-Type': 'application/json' } }
				);
			}
			return new Response(JSON.stringify({ state: 'IDLE' }), {
				status: 200,
				headers: { 'Content-Type': 'application/json' }
			});
		});

		render(AdminSystemPage, { props: {} });

		await new Promise((r) => setTimeout(r, 100));
		expect(document.body.textContent).toContain('connection refused');
	});

	it('renders the DONE state for thumbnail-status with retry button', async () => {
		fetchSpy.mockImplementation(async (url: RequestInfo | URL) => {
			const u = url.toString();
			if (u.includes('thumbnail-status')) {
				return new Response(
					JSON.stringify({
						state: 'DONE',
						message: '',
						total: 100,
						processed: 95,
						skipped: 3,
						failed: 2,
						startedAt: null
					}),
					{ status: 200, headers: { 'Content-Type': 'application/json' } }
				);
			}
			return new Response(JSON.stringify({ state: 'IDLE' }), {
				status: 200,
				headers: { 'Content-Type': 'application/json' }
			});
		});

		render(AdminSystemPage, { props: {} });

		await new Promise((r) => setTimeout(r, 100));
		const banner = document.querySelector('[data-testid="thumbnails-status-done"]');
		expect(banner).not.toBeNull();
	});
});