import { mkdtemp, rm, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import Fastify from 'fastify';
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';

vi.mock('../src/services/ytDlpRunner.js', async (importOriginal) => {
	const actual = await importOriginal<typeof import('../src/services/ytDlpRunner.js')>();
	return { ...actual, runYtDlp: vi.fn(() => new Promise(() => {})) };
});

import { createQueueRoutes } from '../src/routes/queue.js';
import { runYtDlp } from '../src/services/ytDlpRunner.js';
import { extractOutputDir, waitFor } from './helpers.js';

const validUrl = 'https://www.youtube.com/watch?v=dQw4w9WgXcQ';

let tmpDir: string;

beforeEach(async () => {
	tmpDir = await mkdtemp(join(tmpdir(), 'ytdl-queue-route-test-'));
});

afterEach(async () => {
	await rm(tmpDir, { recursive: true, force: true });
});

describe('routes de file d’attente', () => {
	it('POST /api/queue ajoute un élément valide et le retourne', async () => {
		const app = Fastify();
		await app.register(createQueueRoutes({ tmpDir, maxConcurrentDownloads: 2 }));

		const response = await app.inject({
			method: 'POST',
			url: '/api/queue',
			payload: {
				url: validUrl,
				mode: 'audio',
				audioFormat: 'opus',
				thumbnailUrl: 'https://x/thumb.jpg',
			},
		});

		expect(response.statusCode).toBe(201);
		const body = response.json();
		expect(body.item).toMatchObject({
			url: validUrl,
			mode: { kind: 'audio', format: 'opus' },
			status: expect.stringMatching(/pending|running/),
			thumbnailUrl: 'https://x/thumb.jpg',
		});
	});

	it('POST /api/queue renvoie 400 pour une URL non-YouTube', async () => {
		const app = Fastify();
		await app.register(createQueueRoutes({ tmpDir, maxConcurrentDownloads: 2 }));

		const response = await app.inject({
			method: 'POST',
			url: '/api/queue',
			payload: { url: 'https://evil.com/x', mode: 'video' },
		});

		expect(response.statusCode).toBe(400);
	});

	it('POST /api/queue renvoie 400 pour un mode invalide (validation de schéma)', async () => {
		const app = Fastify();
		await app.register(createQueueRoutes({ tmpDir, maxConcurrentDownloads: 2 }));

		const response = await app.inject({
			method: 'POST',
			url: '/api/queue',
			payload: { url: validUrl, mode: 'video-4k-ultra' },
		});

		expect(response.statusCode).toBe(400);
	});

	it('GET /api/queue liste les éléments ajoutés', async () => {
		const app = Fastify();
		await app.register(createQueueRoutes({ tmpDir, maxConcurrentDownloads: 2 }));

		await app.inject({
			method: 'POST',
			url: '/api/queue',
			payload: { url: validUrl, mode: 'thumbnail' },
		});
		const response = await app.inject({ method: 'GET', url: '/api/queue' });

		expect(response.statusCode).toBe(200);
		expect(response.json().items).toHaveLength(1);
	});

	it('DELETE /api/queue/:id renvoie 404 pour un identifiant inconnu', async () => {
		const app = Fastify();
		await app.register(createQueueRoutes({ tmpDir, maxConcurrentDownloads: 2 }));

		const response = await app.inject({ method: 'DELETE', url: '/api/queue/inconnu' });

		expect(response.statusCode).toBe(404);
	});

	it('DELETE /api/queue/:id supprime un élément et le retire de la liste', async () => {
		const app = Fastify();
		await app.register(createQueueRoutes({ tmpDir, maxConcurrentDownloads: 2 }));

		const created = await app.inject({
			method: 'POST',
			url: '/api/queue',
			payload: { url: validUrl, mode: 'video' },
		});
		const { id } = created.json().item;

		const deleteResponse = await app.inject({ method: 'DELETE', url: `/api/queue/${id}` });
		expect(deleteResponse.statusCode).toBe(204);

		const listResponse = await app.inject({ method: 'GET', url: '/api/queue' });
		expect(listResponse.json().items).toHaveLength(0);
	});

	it('GET /api/queue/:id/file renvoie 404 tant que le téléchargement n’est pas terminé', async () => {
		const app = Fastify();
		await app.register(createQueueRoutes({ tmpDir, maxConcurrentDownloads: 2 }));

		const created = await app.inject({
			method: 'POST',
			url: '/api/queue',
			payload: { url: validUrl, mode: 'video' },
		});
		const { id } = created.json().item;

		const response = await app.inject({ method: 'GET', url: `/api/queue/${id}/file` });

		expect(response.statusCode).toBe(404);
	});

	describe('GET /api/queue/download-all', () => {
		it('renvoie 404 quand aucun fichier n’est disponible', async () => {
			const app = Fastify();
			await app.register(createQueueRoutes({ tmpDir, maxConcurrentDownloads: 2 }));

			const response = await app.inject({ method: 'GET', url: '/api/queue/download-all' });

			expect(response.statusCode).toBe(404);
		});

		it('renvoie un zip contenant les fichiers terminés, puis les nettoie', async () => {
			// Simule deux téléchargements terminés en écrivant directement le
			// fichier attendu dans le dossier de sortie fourni à yt-dlp.
			vi.mocked(runYtDlp).mockImplementationOnce(async (args) => {
				await writeFile(join(extractOutputDir(args), 'Video A.mp4'), 'contenu A');
				return '';
			});
			vi.mocked(runYtDlp).mockImplementationOnce(async (args) => {
				await writeFile(join(extractOutputDir(args), 'Video B.mp4'), 'contenu B');
				return '';
			});

			const app = Fastify();
			await app.register(createQueueRoutes({ tmpDir, maxConcurrentDownloads: 2 }));

			await app.inject({
				method: 'POST',
				url: '/api/queue',
				payload: { url: validUrl, mode: 'video' },
			});
			await app.inject({
				method: 'POST',
				url: '/api/queue',
				payload: { url: validUrl, mode: 'video' },
			});

			await waitFor(async () => {
				const list = await app.inject({ method: 'GET', url: '/api/queue' });
				const items: Array<{ status: string }> = list.json().items;
				return items.length === 2 && items.every((item) => item.status === 'completed');
			});

			const response = await app.inject({ method: 'GET', url: '/api/queue/download-all' });

			expect(response.statusCode).toBe(200);
			expect(response.headers['content-type']).toBe('application/zip');
			expect(response.headers['content-disposition']).toContain('youtubedownloader.zip');
			// Signature ZIP standard (PK\x03\x04) en tête du fichier.
			expect(response.rawPayload.subarray(0, 4)).toEqual(Buffer.from([0x50, 0x4b, 0x03, 0x04]));

			// Les deux éléments ont bien été livrés : plus de fichier disponible
			// (et un second appel ne renverrait donc plus rien).
			await waitFor(async () => {
				const after = await app.inject({ method: 'GET', url: '/api/queue' });
				const items: Array<{ fileName: string | null }> = after.json().items;
				return items.every((item) => item.fileName === null);
			});

			const secondAttempt = await app.inject({ method: 'GET', url: '/api/queue/download-all' });
			expect(secondAttempt.statusCode).toBe(404);
		});
	});
});