package config

import (
	"log"
	"os"
	"path/filepath"

	"github.com/joho/godotenv"
)

// Config 应用配置
type Config struct {
	Port      string
	DBHost    string
	DBPort    string
	DBUser    string
	DBPass    string
	DBName    string
	JWTSecret string
	RedisURL  string
	S3Bucket  string
}

// Load 加载配置（优先读取环境变量，支持 .env 文件）
// 查找顺序：可执行文件同目录 → 当前目录 → 环境变量
func Load() *Config {
	// 从可执行文件所在目录加载 .env（宝塔场景）
	if exe, err := os.Executable(); err == nil {
		exeDir := filepath.Dir(exe)
		_ = godotenv.Load(filepath.Join(exeDir, ".env"))
	}

	// 从当前目录加载 .env（本地开发场景）
	_ = godotenv.Load()

	c := &Config{
		Port:      getEnv("PORT", "8080"),
		DBHost:    getEnv("DB_HOST", "127.0.0.1"),
		DBPort:    getEnv("DB_PORT", "3306"),
		DBUser:    getEnv("DB_USER", "root"),
		DBPass:    getEnv("DB_PASS", ""),
		DBName:    getEnv("DB_NAME", "inchstep"),
		JWTSecret: getEnv("JWT_SECRET", "dev-secret-change-in-production"),
		RedisURL:  getEnv("REDIS_URL", "redis://127.0.0.1:6379/0"),
		S3Bucket:  getEnv("S3_BUCKET", ""),
	}

	log.Println("[寸进] 配置加载完成")
	log.Printf("[寸进]   DB: %s:%s/%s", c.DBHost, c.DBPort, c.DBName)
	log.Printf("[寸进]   JWT: %s...", maskSecret(c.JWTSecret, 8))
	log.Printf("[寸进]   Redis: %s", c.RedisURL)

	return c
}

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

func maskSecret(s string, keep int) string {
	if len(s) <= keep {
		return s
	}
	return s[:keep] + "..."
}