import path from "node:path";

function req(name: string, fallback?: string): string {
  const v = process.env[name] ?? fallback;
  if (v === undefined || v === "") throw new Error(`Missing required environment variable ${name}`);
  return v;
}

export const env = {
  get DATABASE_URL() { return req("DATABASE_URL"); },
  get DATA_DIR() { return path.resolve(process.env.DATA_DIR ?? "./data"); },
  get UPLOAD_DIR() { return path.join(this.DATA_DIR, "uploads"); },
  get SESSION_SECRET() { return req("SESSION_SECRET"); },
  get OPENAI_API_KEY() { return process.env.OPENAI_API_KEY ?? ""; },
  get ANTHROPIC_API_KEY() { return process.env.ANTHROPIC_API_KEY ?? ""; },
  get TAVILY_API_KEY() { return process.env.TAVILY_API_KEY ?? ""; },
  get PYTHON_BIN() { return process.env.PYTHON_BIN ?? "python3"; },
  get APP_URL() { return process.env.APP_URL ?? "https://chat.spboucher.ai"; },
  get NODE_ENV() { return process.env.NODE_ENV ?? "development"; },
  get SESSION_TTL_DAYS() { return Number(process.env.SESSION_TTL_DAYS ?? 30); },
  get MAX_UPLOAD_MB() { return Number(process.env.MAX_UPLOAD_MB ?? 50); },
  get BENCHMARKS_DIR() { return path.resolve(process.env.BENCHMARKS_DIR ?? "./benchmarks"); },
};