/**
 * Environment-driven server configuration.
 *
 * All values are read from `process.env` at import time with sensible
 * defaults so the server boots with zero configuration for local dev.
 */

function env(key: string, fallback: string): string {
  const value = process.env[key];
  return value === undefined || value === "" ? fallback : value;
}

function envInt(key: string, fallback: number): number {
  const raw = process.env[key];
  if (raw === undefined || raw === "") return fallback;
  const n = Number.parseInt(raw, 10);
  return Number.isFinite(n) ? n : fallback;
}

export interface ServerConfig {
  /** Path to the SQLite database file. */
  dbPath: string;
  /** Port the HTTP server listens on. */
  port: number;
  /** Origin allowed for CORS. */
  origin: string;
  /** Email of the bootstrap admin user. */
  adminEmail: string;
  /** Session token TTL in seconds. */
  tokenTtl: number;
  /** Version string reported by /api/version. */
  version: string;
}

export const config: ServerConfig = {
  dbPath: env("PUBSCRIPT_DB", "./data/pubscript.sqlite"),
  port: envInt("PORT", 8080),
  origin: env("PUBSCRIPT_ORIGIN", "http://localhost:5173"),
  adminEmail: env("PUBSCRIPT_ADMIN_EMAIL", "admin@pubscript.local"),
  tokenTtl: envInt("PUBSCRIPT_TOKEN_TTL", 60 * 60 * 24 * 30),
  version: env("PUBSCRIPT_VERSION", "0.1.0"),
};