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

import type { FastifyInstance, LightMyRequestResponse } from 'fastify';
import FormData from 'form-data';
import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, it } from 'vitest';

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

let idp: StubIdp;
let session: string;
let app: FastifyInstance;
let dirA: string;
let dirB: string;

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

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

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

beforeEach(async () => {
  dirA = await makeTempDir();
  dirB = await makeTempDir();
  app = await buildApp(
    makeConfig({
      targets: [
        { name: 'a', label: 'Dossier A', dir: dirA, allowDirectories: true },
        { name: 'b', label: 'Dossier B', dir: dirB, allowDirectories: false },
      ],
      maxFileSizeBytes: 2000,
      oidc: oidcOverride(idp),
    }),
    { logger: false },
  );
  await app.ready();
  session = await login(app, idp);
});

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

const postUpload = (
  form: FormData,
  opts: { cookie?: string; target?: string; path?: string } = {},
): Promise<LightMyRequestResponse> => {
  const params = new URLSearchParams();
  if (opts.target !== undefined) params.set('target', opts.target);
  if (opts.path !== undefined) params.set('path', opts.path);
  const query = params.toString();
  return app.inject({
    method: 'POST',
    url: query ? `/upload?${query}` : '/upload',
    payload: form,
    headers: form.getHeaders(),
    ...(opts.cookie !== undefined ? { cookies: { [SESSION_COOKIE]: opts.cookie } } : {}),
  });
};

function pngForm(field = 'file', body: Buffer = TINY_PNG): FormData {
  const form = new FormData();
  form.append(field, body, { filename: 'photo.png', contentType: 'image/png' });
  return form;
}

describe('GET /health', () => {
  it('répond 200 sans authentification', async () => {
    const res = await app.inject({ method: 'GET', url: '/health' });
    expect(res.statusCode).toBe(200);
    expect(res.json<{ status: string }>().status).toBe('ok');
  });
});

describe('GET /config', () => {
  it('expose chunkPoolSize sans authentification', async () => {
    const res = await app.inject({ method: 'GET', url: '/config' });
    expect(res.statusCode).toBe(200);
    expect(res.json()).toEqual({ chunkPoolSize: 30 });
  });

  it('reflète la valeur configurée', async () => {
    const custom = await buildApp(makeConfig({ chunkPoolSize: 12, oidc: oidcOverride(idp) }), {
      logger: false,
    });
    await custom.ready();
    const res = await custom.inject({ method: 'GET', url: '/config' });
    expect(res.json<{ chunkPoolSize: number }>().chunkPoolSize).toBe(12);
    await custom.close();
  });
});

describe('GET /targets', () => {
  it('exige une session', async () => {
    const res = await app.inject({ method: 'GET', url: '/targets' });
    expect(res.statusCode).toBe(401);
  });

  it('renvoie nom, libellé et allowDirectories (sans chemin disque)', async () => {
    const res = await app.inject({
      method: 'GET',
      url: '/targets',
      cookies: { [SESSION_COOKIE]: session },
    });
    expect(res.statusCode).toBe(200);
    expect(res.json()).toEqual([
      { name: 'a', label: 'Dossier A', allowDirectories: true },
      { name: 'b', label: 'Dossier B', allowDirectories: false },
    ]);
  });
});

describe('POST /upload', () => {
  it('refuse sans session (401)', async () => {
    const res = await postUpload(pngForm());
    expect(res.statusCode).toBe(401);
  });

  it('refuse un cookie de session illisible (401)', async () => {
    const res = await postUpload(pngForm(), { cookie: 'cookie-bidon' });
    expect(res.statusCode).toBe(401);
  });

  it('dépose dans la cible par défaut (première) quand ?target est absent', async () => {
    const res = await postUpload(pngForm(), { cookie: session });

    expect(res.statusCode).toBe(201);
    const body = res.json<{ target: string; size: number; mimeType: string }>();
    expect(body.target).toBe('a');
    expect(body.size).toBe(TINY_PNG.length);
    expect(await readdir(dirA)).toHaveLength(1);
    expect(await readdir(dirB)).toHaveLength(0);
  });

  it('dépose dans la cible demandée via ?target=', async () => {
    const res = await postUpload(pngForm(), { cookie: session, target: 'b' });
    expect(res.statusCode).toBe(201);
    expect(res.json<{ target: string }>().target).toBe('b');
    expect(await readdir(dirB)).toHaveLength(1);
  });

  it('refuse une cible inconnue (400)', async () => {
    const res = await postUpload(pngForm(), { cookie: session, target: 'inconnu' });
    expect(res.statusCode).toBe(400);
    expect(await readdir(dirA)).toHaveLength(0);
  });

  it('refuse un mauvais nom de champ (400)', async () => {
    const res = await postUpload(pngForm('autre'), { cookie: session });
    expect(res.statusCode).toBe(400);
  });

  it('refuse un type de média non autorisé (400)', async () => {
    const form = new FormData();
    form.append('file', Buffer.from('PK\x03\x04'), {
      filename: 'archive.zip',
      contentType: 'application/zip',
    });
    const res = await postUpload(form, { cookie: session });
    expect(res.statusCode).toBe(400);
  });

  it('refuse un fichier trop volumineux (413)', async () => {
    const res = await postUpload(pngForm('file', Buffer.alloc(5000, 1)), { cookie: session });
    expect(res.statusCode).toBe(413);
  });

  it('refuse une requête sans fichier (400)', async () => {
    const form = new FormData();
    form.append('title', 'juste du texte');
    const res = await postUpload(form, { cookie: session });
    expect(res.statusCode).toBe(400);
  });
});

describe('POST /upload — dépôt de dossier (?path=)', () => {
  it('recrée l’arborescence sous une cible qui l’autorise', async () => {
    const res = await postUpload(pngForm(), {
      cookie: session,
      target: 'a',
      path: 'vac/plage/photo.png',
    });
    expect(res.statusCode).toBe(201);
    expect(res.json<{ storedName: string }>().storedName).toBe('vac/plage/photo.png');
    expect(await readdir(join(dirA, 'vac', 'plage'))).toEqual(['photo.png']);
  });

  it('refuse ?path= sur une cible qui n’autorise pas les dossiers (400)', async () => {
    const res = await postUpload(pngForm(), {
      cookie: session,
      target: 'b',
      path: 'sub/photo.png',
    });
    expect(res.statusCode).toBe(400);
    expect(await readdir(dirB)).toHaveLength(0);
  });

  it('ne permet pas de sortir de la cible avec ../', async () => {
    const res = await postUpload(pngForm(), {
      cookie: session,
      target: 'a',
      path: '../../evil/x.png',
    });
    expect(res.statusCode).toBe(201);
    expect(res.json<{ storedName: string }>().storedName).toBe('evil/x.png');
    expect(await readdir(join(dirA, 'evil'))).toEqual(['x.png']);
  });

  it('écrase un fichier déjà présent au même chemin', async () => {
    const opts = { cookie: session, target: 'a', path: 'd/f.png' };
    await postUpload(pngForm('file', Buffer.from('11111')), opts);
    await postUpload(pngForm('file', Buffer.from('22')), opts);
    expect(await readdir(join(dirA, 'd'))).toEqual(['f.png']);
    expect(await readFile(join(dirA, 'd', 'f.png'))).toEqual(Buffer.from('22'));
  });
});

describe('POST /upload — au-delà du bodyLimit Fastify', () => {
  let bigApp: FastifyInstance;
  let bigDir: string;
  let bigSession: string;

  beforeEach(async () => {
    bigDir = await makeTempDir();
    bigApp = await buildApp(
      makeConfig({
        targets: oneTarget(bigDir),
        maxFileSizeBytes: 32 * 1024 * 1024,
        oidc: oidcOverride(idp),
      }),
      { logger: false },
    );
    await bigApp.ready();
    bigSession = await login(bigApp, idp);
  });

  afterEach(async () => {
    await bigApp.close();
    await removeDir(bigDir);
  });

  it('accepte un fichier de 2 Mio (> 1 Mio, bodyLimit par défaut)', async () => {
    const form = new FormData();
    form.append('file', Buffer.alloc(2 * 1024 * 1024, 7), {
      filename: 'clip.png',
      contentType: 'image/png',
    });
    const res = await bigApp.inject({
      method: 'POST',
      url: '/upload',
      payload: form,
      headers: form.getHeaders(),
      cookies: { [SESSION_COOKIE]: bigSession },
    });
    expect(res.statusCode).toBe(201);
    expect(res.json<{ size: number }>().size).toBe(2 * 1024 * 1024);
  });
});