import {
  IsBooleanString,
  IsEnum,
  IsNumber,
  IsOptional,
  IsPositive,
  IsString,
  IsUrl,
  Matches,
  Max,
  Min,
  MinLength,
} from "class-validator";
import { StringValue } from "ms";

export enum Environment {
  Development = "development",
  Production = "production",
}

export class EnvironmentVariables {
  @IsEnum(Environment, {
    message: "NODE_ENV should be development or production",
  })
  NODE_ENV: Environment;

  // --------------------------------------------------------- //

  @IsNumber(
    {
      allowNaN: false,
      allowInfinity: false,
    },
    {
      message: "PORT must be a valid number",
    },
  )
  @IsPositive({ message: "PORT must be positive" })
  @Min(0, { message: "PORT must be between 0 and 65535" })
  @Max(65535, { message: "PORT must be between 0 and 65535" })
  PORT: number;

  // --------------------------------------------------------- //

  @IsString({ message: "MONGO_URI must be string" })
  @IsUrl(
    {
      require_tld: false,
      protocols: ["mongodb", "mongodb+srv"],
    },
    {
      message: "MONGO_URI must be in the correct format (mongodb://...)",
    },
  )
  MONGO_URI: string;

  // --------------------------------------------------------- //

  @IsBooleanString({ message: "MONGO_TLS must be boolean" })
  MONGO_TLS: string;

  // --------------------------------------------------------- //

  @IsBooleanString({ message: "MONGO_TLS_ALLOW_INVALID_CERTS must be boolean" })
  MONGO_TLS_ALLOW_INVALID_CERTS: string;

  // --------------------------------------------------------- //

  @IsString({ message: "JWT_SECRET must be string" })
  @MinLength(32, {
    message: "JWT_SECRET must be at least 32 characters",
  })
  JWT_SECRET: string;

  // --------------------------------------------------------- //

  @Matches(/^\d+(ms|s|m|h|d|w|y)$/, {
    message: "JWT_EXPIRY must be in the correct format",
  })
  JWT_EXPIRY: StringValue;

  // --------------------------------------------------------- //
  @IsString({ message: "HASH_PEPPER must be string" })
  @IsOptional()
  HASH_PEPPER?: string;
  // --------------------------------------------------------- //
}