import { readFile, readdir, rm } from 'node:fs/promises';
import { join } from 'node:path';
import { randomBytes } from 'node:crypto';

import type { FastifyInstance } from 'fastify';
import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, it } from 'vitest';

import { buildApp } from '../src/app.js';
import type { OidcConfig } from '../src/config.js';
import { makeConfig, makeTempDir, removeDir, startStubIdp, type StubIdp } from './helpers.js';

const MIB = 1024 * 1024;

let idp: StubIdp;
let cookie: string;
let app: FastifyInstance;
let baseUrl: string;
let dir: string;

function oidcOverride(ref: StubIdp): OidcConfig {
  return {
    issuer: ref.issuer,
    clientId: ref.clientId,
    clientSecret: ref.clientSecret,
    scopes: ['openid', 'profile', 'email'],
  };
}

function sessionCookie(res: Response): string {
  return (res.headers.get('set-cookie') ?? '').split(';')[0] ?? '';
}

/** Déroule la connexion OIDC via de vraies requêtes HTTP ; renvoie l'en-tête Cookie. */
async function loginViaHttp(): Promise<string> {
  const start = await fetch(`${baseUrl}/auth/login`, { redirect: 'manual' });
  const txn = sessionCookie(start);
  const authUrl = new URL(start.headers.get('location') ?? '');
  idp.setNextIdToken({ nonce: authUrl.searchParams.get('nonce') ?? '' });
  const state = authUrl.searchParams.get('state') ?? '';
  const cb = await fetch(`${baseUrl}/auth/callback?code=x&state=${encodeURIComponent(state)}`, {
    redirect: 'manual',
    headers: { cookie: txn },
  });
  return sessionCookie(cb);
}

beforeAll(async () => {
  idp = await startStubIdp();
});

afterAll(async () => {
  await idp.close();
});

beforeEach(async () => {
  dir = await makeTempDir();
  app = await buildApp(
    makeConfig({
      targets: [
        { name: 'flat', label: 'Plat', dir, allowDirectories: false },
        { name: 'tree', label: 'Arbo', dir, allowDirectories: true },
      ],
      maxFileSizeBytes: 8 * MIB,
      allowedMimeTypes: ['video/*', 'image/png'],
      oidc: oidcOverride(idp),
    }),
    { logger: false },
  );
  await app.listen({ port: 0, host: '127.0.0.1' });
  const address = app.server.address();
  if (address === null || typeof address === 'string') throw new Error('adresse inattendue');
  baseUrl = `http://127.0.0.1:${String(address.port)}`;
  cookie = await loginViaHttp();
});

afterEach(async () => {
  await app.close();
  await removeDir(dir);
});

function initBody(over: Record<string, unknown> = {}): Record<string, unknown> {
  return { target: 'flat', name: 'clip.mp4', size: 3, type: 'video/mp4', ...over };
}

interface InitResult {
  status: number;
  body: { id?: string; chunkSize?: number; chunkCount?: number; message?: string };
}

async function init(over: Record<string, unknown> = {}, withCookie = true): Promise<InitResult> {
  const res = await fetch(`${baseUrl}/upload/init`, {
    method: 'POST',
    headers: { 'content-type': 'application/json', ...(withCookie ? { cookie } : {}) },
    body: JSON.stringify(initBody(over)),
  });
  return { status: res.status, body: (await res.json().catch(() => ({}))) as InitResult['body'] };
}

async function putChunk(id: string, index: number, data: Buffer): Promise<number> {
  const res = await fetch(`${baseUrl}/upload/${id}/${String(index)}`, {
    method: 'PUT',
    headers: { 'content-type': 'application/octet-stream', cookie },
    body: new Uint8Array(data),
  });
  return res.status;
}

async function complete(id: string): Promise<{ status: number; body: unknown }> {
  const res = await fetch(`${baseUrl}/upload/${id}/complete`, {
    method: 'POST',
    headers: { cookie },
  });
  return { status: res.status, body: await res.json().catch(() => ({})) };
}

describe('upload fragmenté', () => {
  it('init -> morceau -> complete : le fichier est finalisé au bon endroit', async () => {
    const data = randomBytes(200 * 1024);
    const started = await init({
      size: data.length,
      chunkSize: MIB,
      path: 'a/b/clip.mp4',
      target: 'tree',
    });
    expect(started.status).toBe(201);
    const { id, chunkCount } = started.body;
    expect(chunkCount).toBe(1);

    const ack = await fetch(`${baseUrl}/upload/${id!}/0`, {
      method: 'PUT',
      headers: { 'content-type': 'application/octet-stream', cookie },
      body: new Uint8Array(data),
    });
    expect(ack.status).toBe(200);
    expect(await ack.json()).toEqual({ received: 1, total: 1 });

    const done = await complete(id!);
    expect(done.status).toBe(201);
    expect(done.body).toMatchObject({ storedName: 'a/b/clip.mp4', size: data.length });

    expect(await readFile(join(dir, 'a', 'b', 'clip.mp4'))).toEqual(data);
    expect(await readdir(join(dir, 'a', 'b'))).toEqual(['clip.mp4']);
  });

  it('init lit target et path dans la query (comme le client web)', async () => {
    const data = randomBytes(1000);
    const query = new URLSearchParams({ target: 'tree', path: 'dossier/clip.mp4' });
    const res = await fetch(`${baseUrl}/upload/init?${query.toString()}`, {
      method: 'POST',
      headers: { 'content-type': 'application/json', cookie },
      body: JSON.stringify({ name: 'clip.mp4', size: data.length, type: 'video/mp4' }),
    });
    expect(res.status).toBe(201);
    const { id } = (await res.json()) as { id: string };
    expect(await putChunk(id, 0, data)).toBe(200);
    const done = await complete(id);
    expect(done.body).toMatchObject({ target: 'tree', storedName: 'dossier/clip.mp4' });
    expect(await readFile(join(dir, 'dossier', 'clip.mp4'))).toEqual(data);
  });

  it('init refuse une cible inconnue passée dans la query (400)', async () => {
    const res = await fetch(`${baseUrl}/upload/init?target=inconnue`, {
      method: 'POST',
      headers: { 'content-type': 'application/json', cookie },
      body: JSON.stringify({ name: 'clip.mp4', size: 3, type: 'video/mp4' }),
    });
    expect(res.status).toBe(400);
  });

  it('PUT renvoie 404 (et non 500) si le fichier partiel a disparu', async () => {
    const { body } = await init({ size: MIB, chunkSize: MIB });
    const [part] = await readdir(dir);
    await rm(join(dir, part!));
    expect(await putChunk(body.id!, 0, Buffer.alloc(10))).toBe(404);
  });

  it('init refuse une taille au-dessus de la limite (413)', async () => {
    expect((await init({ size: 9 * MIB })).status).toBe(413);
  });

  it('init refuse un type non autorisé (400)', async () => {
    expect((await init({ type: 'application/zip' })).status).toBe(400);
  });

  it('init refuse un chemin sur une cible sans allowDirectories (400)', async () => {
    expect((await init({ target: 'flat', path: 'x/clip.mp4' })).status).toBe(400);
  });

  it('init exige une session (401)', async () => {
    expect((await init({}, false)).status).toBe(401);
  });

  it('PUT refuse un index hors limites (400)', async () => {
    const { body } = await init({ size: MIB, chunkSize: MIB });
    expect(await putChunk(body.id!, 5, Buffer.alloc(10))).toBe(400);
  });

  it('complete refuse un upload incomplet (400) et ne finalise rien', async () => {
    const data = randomBytes(2 * MIB + 10);
    const { body } = await init({ size: data.length, chunkSize: MIB });
    expect(body.chunkCount).toBe(3);
    expect(await putChunk(body.id!, 0, data.subarray(0, MIB))).toBe(200);

    expect((await complete(body.id!)).status).toBe(400);
    const files = await readdir(dir);
    expect(files).toHaveLength(1);
    expect(files[0]).toMatch(/\.mediadrop-part$/);
  });

  it('404 sur une session inconnue', async () => {
    expect(await putChunk('inexistante', 0, Buffer.alloc(10))).toBe(404);
    expect((await complete('inexistante')).status).toBe(404);
  });

  it('DELETE abandonne : le fichier partiel disparaît, la session aussi', async () => {
    const { body } = await init({ size: MIB, chunkSize: MIB });
    expect(await putChunk(body.id!, 0, Buffer.alloc(1000))).toBe(200);

    const del = await fetch(`${baseUrl}/upload/${body.id!}`, {
      method: 'DELETE',
      headers: { cookie },
    });
    expect(del.status).toBe(204);
    expect(await readdir(dir)).toHaveLength(0);
    expect(await putChunk(body.id!, 0, Buffer.alloc(10))).toBe(404);
  });
});