import { randomBytes } from 'node:crypto';
import path from 'node:path';
import { fileURLToPath } from 'node:url';
import dotenv from 'dotenv';

const here = path.dirname(fileURLToPath(import.meta.url));
const repoRoot = path.resolve(here, '../../..');

dotenv.config({ path: path.join(repoRoot, '.env'), quiet: true });

function required(name: string, fallback?: string): string {
  const value = process.env[name] ?? fallback;
  if (!value) {
    throw new Error(
      `Variable d'environnement manquante : ${name}. Copie .env.example vers .env et complète-la.`,
    );
  }
  return value;
}

function int(name: string, fallback: number): number {
  const raw = process.env[name];
  if (!raw) return fallback;
  const parsed = Number.parseInt(raw, 10);
  return Number.isFinite(parsed) ? parsed : fallback;
}

const isDev = process.env.NODE_ENV !== 'production';

export const config = {
  port: int('PORT', 8080),
  host: process.env.HOST ?? '0.0.0.0',
  isDev,

  adminPassword: required('ADMIN_PASSWORD', isDev ? 'admin' : undefined),
  sessionSecret: required(
    'SESSION_SECRET',
    isDev ? randomBytes(32).toString('hex') : undefined,
  ),
  sessionTtlMs: int('SESSION_TTL_MS', 12 * 60 * 60 * 1000),

  /** Vide = enrôlement automatique désactivé. */
  enrollmentToken: process.env.ENROLLMENT_TOKEN ?? '',

  dbPath: path.resolve(repoRoot, process.env.DB_PATH ?? './data/stream-control.sqlite'),

  statusIntervalMs: int('STATUS_INTERVAL_MS', 2000),
  agentTimeoutMs: int('AGENT_TIMEOUT_MS', 15_000),
  commandTimeoutMs: int('COMMAND_TIMEOUT_MS', 15_000),

  /** Nombre d'entrées de journal conservées en base. */
  logRetention: int('LOG_RETENTION', 2000),

  webDist: path.resolve(repoRoot, 'packages/web/dist'),
} as const;