import { mkdtemp, rm, writeFile } from 'node:fs/promises';
import { tmpdir } from 'node:os';
import path from 'node:path';

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

import { CONFIG_PATH_ENV, loadConfig, parseConfig } from '../src/config.js';
import { DEFAULT_ALLOWED_MIME } from '../src/lib/media-types.js';
import { ConfigError } from '../src/errors.js';

const KEY_B64 = Buffer.alloc(32, 1).toString('base64');

const BASE = {
  publicUrl: 'http://localhost:3000',
  targets: [{ name: 'photos', dir: './uploads/photos' }],
  session: { key: KEY_B64 },
  oidc: {
    issuer: 'https://auth.exemple.fr/realms/demo',
    clientId: 'mediadrop',
    clientSecret: 's3cr3t',
  },
};

describe('parseConfig', () => {
  it('applique les valeurs par défaut', () => {
    const config = parseConfig(structuredClone(BASE));

    expect(config).toMatchObject({
      port: 3000,
      host: '0.0.0.0',
      publicUrl: 'http://localhost:3000',
      maxFileSizeBytes: 512 * 1024 * 1024,
      logLevel: 'info',
    });
    expect(config.targets).toEqual([{ name: 'photos', label: 'photos', dir: './uploads/photos' }]);
    expect(config.allowedMimeTypes).toBe(DEFAULT_ALLOWED_MIME);
    expect(config.session.maxAgeSeconds).toBe(12 * 3600);
    expect(config.session.key).toHaveLength(32);
    expect(config.oidc).toEqual({
      issuer: 'https://auth.exemple.fr/realms/demo',
      clientId: 'mediadrop',
      clientSecret: 's3cr3t',
      scopes: ['openid', 'profile', 'email'],
    });
  });

  it('rejette une racine ou un sous-objet non-objet', () => {
    expect(() => parseConfig('nope')).toThrow(ConfigError);
    expect(() => parseConfig({})).toThrow(ConfigError);
    expect(() => parseConfig({ ...BASE, session: [] })).toThrow(ConfigError);
  });

  it('exige publicUrl, session.key et le bloc oidc complet', () => {
    expect(() =>
      parseConfig({ session: BASE.session, oidc: BASE.oidc, targets: BASE.targets }),
    ).toThrow(ConfigError);
    expect(() => parseConfig({ ...BASE, session: {} })).toThrow(ConfigError);
    expect(() =>
      parseConfig({ ...BASE, oidc: { issuer: BASE.oidc.issuer, clientId: 'x' } }),
    ).toThrow(ConfigError);
  });

  it('valide les cibles de dépôt', () => {
    expect(() => parseConfig({ ...BASE, targets: [] })).toThrow(ConfigError);
    expect(() => parseConfig({ ...BASE, targets: 'photos' })).toThrow(ConfigError);
    expect(() => parseConfig({ ...BASE, targets: [{ name: 'ok' }] })).toThrow(ConfigError);
    expect(() => parseConfig({ ...BASE, targets: [{ name: 'a/b', dir: './x' }] })).toThrow(
      ConfigError,
    );
    expect(() =>
      parseConfig({
        ...BASE,
        targets: [
          { name: 'dup', dir: './a' },
          { name: 'dup', dir: './b' },
        ],
      }),
    ).toThrow(ConfigError);
    expect(
      parseConfig({ ...BASE, targets: [{ name: 'x', label: 'X', dir: './x' }] }).targets[0],
    ).toEqual({ name: 'x', label: 'X', dir: './x' });
  });

  it('rejette une session.key qui ne fait pas 32 octets', () => {
    expect(() =>
      parseConfig({ ...BASE, session: { key: Buffer.alloc(16).toString('base64') } }),
    ).toThrow(ConfigError);
  });

  it('rejette un issuer / publicUrl non http(s) et normalise le slash final', () => {
    expect(() => parseConfig({ ...BASE, publicUrl: 'pas-une-url' })).toThrow(ConfigError);
    expect(() => parseConfig({ ...BASE, oidc: { ...BASE.oidc, issuer: 'ftp://x.fr' } })).toThrow(
      ConfigError,
    );
    expect(
      parseConfig({ ...BASE, oidc: { ...BASE.oidc, issuer: 'https://x.fr/realm/' } }).oidc.issuer,
    ).toBe('https://x.fr/realm');
  });

  it('force le scope openid et lit maxAgeHours', () => {
    expect(
      parseConfig({ ...BASE, oidc: { ...BASE.oidc, scopes: ['profile'] } }).oidc.scopes,
    ).toEqual(['openid', 'profile']);
    expect(
      parseConfig({ ...BASE, session: { key: KEY_B64, maxAgeHours: 2 } }).session.maxAgeSeconds,
    ).toBe(7200);
  });

  it('valide port, maxFileSizeMb et logLevel', () => {
    expect(() => parseConfig({ ...BASE, port: 3.5 })).toThrow(ConfigError);
    expect(() => parseConfig({ ...BASE, maxFileSizeMb: 0 })).toThrow(ConfigError);
    expect(() => parseConfig({ ...BASE, logLevel: 'verbose' })).toThrow(ConfigError);
  });

  it('interprète allowedMimeTypes', () => {
    expect(
      parseConfig({ ...BASE, allowedMimeTypes: ['image/png', 'IMAGE/WEBP'] }).allowedMimeTypes,
    ).toEqual(['image/png', 'image/webp']);
    expect(parseConfig({ ...BASE, allowedMimeTypes: 'all' }).allowedMimeTypes).toBe('all');
    expect(() => parseConfig({ ...BASE, allowedMimeTypes: 'image/png' })).toThrow(ConfigError);
  });
});

describe('loadConfig', () => {
  let dir: string;

  beforeEach(async () => {
    dir = await mkdtemp(path.join(tmpdir(), 'mediadrop-cfg-'));
  });

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

  it('lit et valide le fichier désigné par la variable d’environnement', async () => {
    const file = path.join(dir, 'app.json');
    await writeFile(file, JSON.stringify(BASE));
    expect(loadConfig({ [CONFIG_PATH_ENV]: file }).oidc.clientId).toBe('mediadrop');
  });

  it('lève ConfigError si le fichier est absent ou si le JSON est cassé', async () => {
    expect(() => loadConfig({ [CONFIG_PATH_ENV]: path.join(dir, 'absent.json') })).toThrow(
      ConfigError,
    );
    const broken = path.join(dir, 'broken.json');
    await writeFile(broken, '{ oidc: ');
    expect(() => loadConfig({ [CONFIG_PATH_ENV]: broken })).toThrow(ConfigError);
  });
});