import "dotenv/config";
import ms from "ms";

export const DB_TYPE = process.env.DB_TYPE ?? "mysql";
export const DB_HOST = process.env.DB_HOST ?? "";
export const DB_NAME = process.env.DB_NAME ?? "";
export const DB_USERNAME = process.env.DB_USERNAME ?? "";
export const DB_PASSWORD = process.env.DB_PASSWORD ?? "";

export const SERVER_PORT = Number(process.env.SERVER_PORT ?? 5000);

export const JWT_SECRET = process.env.JWT_SECRET ?? "my_jwt_secret_string_ilughfnadiuhgq§$IUZGFVRweiouarbt1oub3h5q4a";
export const JWT_EXPIRATION = process.env.JWT_EXPIRATION ?? "15m";
export const REFRESH_EXPIRATION = process.env.REFRESH_EXPIRATION ?? "1d";

export const MAIL_USERNAME = process.env.MAIL_USERNAME ?? "";
export const MAIL_PASSWORD = process.env.MAIL_PASSWORD ?? "";
export const MAIL_HOST = process.env.MAIL_HOST ?? "";
export const MAIL_PORT = Number(process.env.MAIL_PORT ?? "587");
export const MAIL_SECURE = process.env.MAIL_SECURE ?? "false";

export const CLUB_NAME = process.env.CLUB_NAME ?? "";

export function configCheck() {
  if (DB_TYPE != "mysql" && DB_TYPE != "sqlite") throw new Error("set valid value to DB_TYPE (mysql|sqlite)");
  if (DB_HOST == "" ?? typeof DB_HOST != "string") throw new Error("set valid value to DB_HOST");
  if (DB_NAME == "" ?? typeof DB_NAME != "string") throw new Error("set valid value to DB_NAME");
  if (DB_USERNAME == "" ?? typeof DB_USERNAME != "string") throw new Error("set valid value to DB_USERNAME");
  if (DB_PASSWORD == "" ?? typeof DB_PASSWORD != "string") throw new Error("set valid value to DB_PASSWORD");

  if (typeof SERVER_PORT != "number") throw new Error("set valid numeric value to SERVER_PORT");

  if (JWT_SECRET == "" ?? typeof JWT_SECRET != "string") throw new Error("set valid value to JWT_SECRET");
  checkMS(JWT_EXPIRATION, "JWT_EXPIRATION");
  checkMS(REFRESH_EXPIRATION, "REFRESH_EXPIRATION");

  if (MAIL_USERNAME == "" ?? typeof MAIL_USERNAME != "string") throw new Error("set valid value to MAIL_USERNAME");
  if (MAIL_PASSWORD == "" ?? typeof MAIL_PASSWORD != "string") throw new Error("set valid value to MAIL_PASSWORD");
  if (MAIL_HOST == "" ?? typeof MAIL_HOST != "string") throw new Error("set valid value to MAIL_HOST");
  if (typeof MAIL_PORT != "number") throw new Error("set valid numeric value to MAIL_PORT");
  if (MAIL_SECURE != "true" && MAIL_SECURE != "false") throw new Error("set 'true' or 'false' to MAIL_SECURE");
}

function checkMS(input: string, origin: string) {
  try {
    const result = ms(input);
    if (result === undefined) {
      throw new Error(`set valid ms value to ${origin}`);
    }
  } catch (e) {
    throw new Error(`set valid ms value to ${origin}`);
  }
}