package config

import (
	"os"
)

// Config 工具引擎服务配置
type Config struct {
	Port          string
	IoTServiceURL string
	DataDir       string
	DBUrl         string
}

// Load 从环境变量加载配置
func Load() *Config {
	// 向后兼容：优先使用 IOT_SERVICE_URL，回退到 IOT_DEBUG_SERVICE_URL
	iotURL := os.Getenv("IOT_SERVICE_URL")
	if iotURL == "" {
		iotURL = getEnv("IOT_DEBUG_SERVICE_URL", "http://localhost:8083")
	}

	return &Config{
		Port:          getEnv("PORT", "8092"),
		IoTServiceURL: iotURL,
		DataDir:       getEnv("DATA_DIR", "/tmp/cyrene_data"),
		DBUrl:         getEnv("DB_URL", ""),
	}
}

func getEnv(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}