package config

import (
	"os"
	"time"
)

// Config 应用配置
type Config struct {
	ServerPort   string
	ReadTimeout  time.Duration
	WriteTimeout time.Duration
	SM3Salt      string
	SM4Key       []byte
	CallbackURL  string
}

// Load 加载配置，优先从环境变量读取
func Load() *Config {
	sm4KeyStr := getEnv("SM4_KEY", "1234567890abcdef")
	return &Config{
		ServerPort:   getEnv("SERVER_PORT", "8080"),
		ReadTimeout:  10 * time.Second,
		WriteTimeout: 10 * time.Second,
		SM3Salt:      getEnv("SM3_SALT", "default_salt"),
		SM4Key:       []byte(sm4KeyStr),
		CallbackURL:  getEnv("CALLBACK_URL", ""),
	}
}

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