package config

import "os"

// Config 持有 push-gateway 运行时配置
type Config struct {
	Port         string
	JWTSecret    string
	DevMode      bool
	RedisURL     string
	OTLPEndpoint string
}

// Load 从环境变量加载配置并提供默认值
func Load() *Config {
	return &Config{
		Port:         getEnv("PUSH_GATEWAY_PORT", "8081"),
		JWTSecret:    getEnv("JWT_SECRET", "p1-dev-secret-change-in-production"),
		DevMode:      getEnv("DEV_MODE", "false") == "true",
		RedisURL:     getEnv("REDIS_URL", ""),
		OTLPEndpoint: getEnv("OTEL_EXPORTER_OTLP_ENDPOINT", "http://localhost:4318"),
	}
}

// getEnv 读取环境变量，缺失时返回 fallback
func getEnv(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}