import { plainToInstance } from 'class-transformer';
import { IsEnum, IsNumber, IsOptional, IsString, validateSync } from 'class-validator';

enum Environment {
  Development = 'development',
  Production = 'production',
  Test = 'test',
}

export class EnvironmentVariables {
  @IsEnum(Environment)
  @IsOptional()
  NODE_ENV: Environment = Environment.Development;

  @IsNumber()
  @IsOptional()
  PORT: number = 3000;

  @IsString()
  DATABASE_URL: string;

  @IsString()
  @IsOptional()
  REDIS_HOST: string = 'localhost';

  @IsNumber()
  @IsOptional()
  REDIS_PORT: number = 6379;

  @IsString()
  @IsOptional()
  REDIS_PASSWORD?: string;

  @IsString()
  JWT_USER_SECRET: string;

  @IsString()
  @IsOptional()
  JWT_USER_EXPIRES_IN: string = '7d';

  @IsString()
  JWT_ADMIN_ACCESS_SECRET: string;

  @IsString()
  @IsOptional()
  JWT_ADMIN_ACCESS_EXPIRES_IN: string = '1h';

  @IsString()
  JWT_ADMIN_REFRESH_SECRET: string;

  @IsString()
  @IsOptional()
  JWT_ADMIN_REFRESH_EXPIRES_IN: string = '7d';

  @IsString()
  @IsOptional()
  RAYGAN_SMS_USERNAME?: string;

  @IsString()
  @IsOptional()
  RAYGAN_SMS_PASSWORD?: string;

  @IsString()
  @IsOptional()
  RAYGAN_SMS_LINE_NUMBER?: string;

  @IsString()
  @IsOptional()
  RAYGAN_SMS_API_BASE_URL: string = 'https://api.raygansms.com';

  @IsString()
  @IsOptional()
  SMS_DRIVER: string = 'mock';

  @IsString()
  @IsOptional()
  STORAGE_DRIVER: string = 'local';

  @IsString()
  @IsOptional()
  STORAGE_LOCAL_ROOT: string = './uploads';

  @IsString()
  @IsOptional()
  STORAGE_PUBLIC_URL: string = 'http://localhost:3000/uploads';

  @IsString()
  @IsOptional()
  CORS_ADMIN_ORIGIN: string = 'http://localhost:5173';

  @IsString()
  @IsOptional()
  CORS_CLIENT_ORIGIN: string = 'http://localhost:5174';
}

export function validateEnv(config: Record<string, unknown>) {
  const validatedConfig = plainToInstance(EnvironmentVariables, config, {
    enableImplicitConversion: true,
  });
  const errors = validateSync(validatedConfig, { skipMissingProperties: false });

  if (errors.length > 0) {
    throw new Error(`Config validation error: ${errors.toString()}`);
  }
  return validatedConfig;
}