import ms from "ms";
import { EnvSettingString, envSettingsType, SettingString, settingsType } from "../type/settingTypes";

export abstract class SettingHelper {
  private static settings: { [key in SettingString]?: string } = {};
  private static envSettings: { [key in EnvSettingString]?: string } = {};

  public static getSetting(key: SettingString): string | number | boolean | ms.StringValue {
    let settingType = settingsType[key];
    return this.settings[key] ?? settingType.default ?? "";
  }

  public static getEnvSetting(key: EnvSettingString): string {
    let settingType = envSettingsType[key];
    return this.envSettings[key] ?? settingType.default ?? "";
  }

  public static async configure() {}

  public static async configurEnv() {
    this.envSettings = {
      "database.type": process.env.DB_TYPE,
      "database.host": process.env.DB_HOST,
      "database.port": process.env.DB_PORT,
      "database.name": process.env.DB_NAME,
      "database.username": process.env.DB_USERNAME,
      "database.password": process.env.DB_PASSWORD,
    };
    this.checkEnvSettings();
  }

  private static checkEnvSettings() {
    if (!["mysql", "sqlite", "postgres"].includes(this.envSettings["database.type"]))
      throw new Error("set valid value to DB_TYPE (mysql|sqlite|postgres)");
    if (this.checkIfEmptyOrNotString(this.envSettings["database.name"]))
      throw new Error("set valid value to DB_NAME (name of database or filepath for sqlite)");
    if (
      this.checkIfEmptyOrNotString(this.envSettings["database.host"]) &&
      this.envSettings["database.type"] != "sqlite"
    )
      throw new Error("set valid value to DB_HOST");
    if (
      this.checkIfEmptyOrNotString(this.envSettings["database.username"]) &&
      this.envSettings["database.type"] != "sqlite"
    )
      throw new Error("set valid value to DB_USERNAME");
    if (
      this.checkIfEmptyOrNotString(this.envSettings["database.password"]) &&
      this.envSettings["database.type"] != "sqlite"
    )
      throw new Error("set valid value to DB_PASSWORD");
  }

  private static checkIfEmptyOrNotString(val: any) {
    return typeof val != "string" || val == "";
  }
}