import dotenv from "dotenv";

import { asBoolean, asNumber, required } from "./config-helpers";

// Carga de variables de entorno (.env). Si ya están en el entorno, no se sobreescriben.
dotenv.config();

type NodeEnv = "development" | "test" | "production";
type DbSyncMode = "none" | "alter" | "force";
type DbDialect = "postgres" | "mysql" | "mariadb" | "mssql" | "sqlite";

const NODE_ENV = (process.env.NODE_ENV as NodeEnv) ?? "development";
const isProd = NODE_ENV === "production";
const isDev = NODE_ENV === "development";

const API_PORT = asNumber(process.env.API_PORT, 3002);

// En producción exigimos FRONTEND_URL definido (según requisitos actuales).
const FRONTEND_URL = isProd
  ? required("FRONTEND_URL", process.env.FRONTEND_URL)
  : (process.env.FRONTEND_URL ?? "http://localhost:5173");

// Base de datos (dos modos: URL o parámetros sueltos)
const DATABASE_URL = process.env.DATABASE_URL; // p.ej. postgres://user:pass@host:5432/dbname

const DB_DIALECT = (process.env.DB_DIALECT as DbDialect | undefined) ?? "mysql";
const DB_HOST = process.env.DB_HOST ?? "localhost";
const DB_PORT = asNumber(process.env.DB_PORT, 3306);
const DB_NAME = process.env.DB_NAME ?? "";
const DB_USER = process.env.DB_USER ?? "";
const DB_PASS = process.env.DB_PASS ?? "";

const DB_LOGGING = asBoolean(process.env.DB_LOGGING, false);

// Modo de sincronización usado por model-loader.ts
const DB_SYNC_MODE =
  (process.env.DB_SYNC_MODE as DbSyncMode | undefined) ?? (isProd ? "none" : "alter");

// Opcional: timezone para Sequelize (según necesidades)
const APP_TIMEZONE = process.env.APP_TIMEZONE ?? "Europe/Madrid";

// FASTREPORT_BIN: ruta al ejecutable de FastReport CLI
// Si no se define, se buscará en rutas estándar según SO.
const FASTREPORT_BIN = process.env.FASTREPORT_BIN;

// Ruta raíz para plantillas (templates)
const TEMPLATES_PATH = process.env.TEMPLATES_PATH ?? "./templates";

// Documentos
const DOCUMENTS_PATH = process.env.DOCUMENTS_PATH ?? "./documents";

// Proxy (no usáis ahora, pero dejamos la variable por si se activa en el futuro)
const TRUST_PROXY = asNumber(process.env.TRUST_PROXY, 0);

const SIGNING_SERVICE_URL = process.env.SIGNING_SERVICE_URL;
const SIGNING_SERVICE_METHOD = process.env.SIGNING_SERVICE_METHOD ?? "POST";
const SIGNING_SERVICE_TIMEOUT_MS = asNumber(process.env.SIGNING_SERVICE_TIMEOUT_MS, 15_000);
const SIGNING_SERVICE_MAX_RETRIES = asNumber(process.env.SIGNING_SERVICE_MAX_RETRIES, 2);

const COMPANY_SLUG = process.env.COMPANY_SLUG ?? "acme";
const COMPANY_CERTIFICATES_JSON = process.env.COMPANY_CERTIFICATES_JSON ?? {};

export const ENV = {
  NODE_ENV,
  API_PORT,
  FRONTEND_URL,
  DATABASE_URL,
  DB_DIALECT,
  DB_HOST,
  DB_PORT,
  DB_NAME,
  DB_USER,
  DB_PASS,
  DB_LOGGING,
  DB_SYNC_MODE,
  APP_TIMEZONE,
  TRUST_PROXY,

  TEMPLATES_PATH,
  DOCUMENTS_PATH,
  FASTREPORT_BIN,

  SIGNING_SERVICE_URL,
  SIGNING_SERVICE_METHOD,
  SIGNING_SERVICE_TIMEOUT_MS,
  SIGNING_SERVICE_MAX_RETRIES,

  COMPANY_SLUG,
  COMPANY_CERTIFICATES_JSON,
} as const;

export const Flags = {
  isProd,
  isDev,
  isTest: NODE_ENV === "test",
} as const;