import dotenv from "dotenv";

// 环境变量
dotenv.config();

export type Config = {
  PORT: number;
  DISALLOW_ROBOT: boolean;
  CACHE_TTL: number;
  REQUEST_TIMEOUT: number;
  ALLOWED_DOMAIN: string;
  USE_LOG_FILE: boolean;
  RSS_MODE: boolean;
};

// 验证并提取环境变量
const getEnvVariable = (key: string): string | undefined => {
  const value = process.env[key];
  if (value === undefined) {
    return null;
  }
  return value;
};

// 将环境变量转换为数值
const getNumericEnvVariable = (key: string, defaultValue: number): number => {
  const value = getEnvVariable(key) ?? String(defaultValue);
  const parsedValue = parseInt(value, 10);
  if (isNaN(parsedValue)) {
    return defaultValue
  }
  return parsedValue;
};

// 将环境变量转换为布尔值
const getBooleanEnvVariable = (key: string, defaultValue: boolean): boolean => {
  const value = getEnvVariable(key) ?? String(defaultValue);
  return value.toLowerCase() === "true";
};

// 创建配置对象
export const config: Config = {
  PORT: getNumericEnvVariable("PORT", 6688),
  DISALLOW_ROBOT: getBooleanEnvVariable("DISALLOW_ROBOT", true),
  CACHE_TTL: getNumericEnvVariable("CACHE_TTL", 3600),
  REQUEST_TIMEOUT: getNumericEnvVariable("CACHE_TTL", 6000),
  ALLOWED_DOMAIN: getEnvVariable("ALLOWED_DOMAIN") || "*",
  USE_LOG_FILE: getBooleanEnvVariable("USE_LOG_FILE", true),
  RSS_MODE: getBooleanEnvVariable("RSS_MODE", false),
};