package config

import (
	"fmt"

	"github.com/spf13/viper"
)

type Config struct {
	AppEnv      string
	AppPort     string
	RedisAddr   string
	MySQLDSN    string
	PostgresDSN string
	MongoDSN    string
}

// 需先执行LoadConfig后才能读取APP_ENV
var APP_ENV string

// LoadConfig 读取配置文件和环境变量
func LoadConfig() (*Config, error) {
	v := viper.New()

	// 默认值（避免缺省时崩溃）
	v.SetDefault("APP_ENV", "dev")
	v.SetDefault("APP_PORT", "8080")
	v.SetDefault("REDIS_ADDR", "localhost:6379")
	v.SetDefault("MYSQL_DSN", "")
	v.SetDefault("POSTGRES_DSN", "host=localhost user=fwh_toolbox password=fwh_toolbox dbname=fwh_toolbox_db port=5432 sslmode=disable")
	v.SetDefault("MONGO_DSN", "mongodb://localhost:27017/FwhToolboxDbDev")

	// 多文件路径支持
	paths := []string{"./.env", "./config.env"}
	var readErr error
	for _, path := range paths {
		v.SetConfigFile(path)
		if err := v.ReadInConfig(); err == nil {
			fmt.Printf("✅ Using config file: %s\n", path)
			readErr = nil
			break
		} else {
			readErr = err
		}
	}

	// 环境变量覆盖文件配置
	v.AutomaticEnv()

	// 如果两个文件都没读到，也没关系，直接用默认值
	if readErr != nil {
		fmt.Println("⚠️ No config file found, using default values & environment variables")
	}

	APP_ENV = v.GetString("APP_ENV")

	return &Config{
		AppEnv:      v.GetString("APP_ENV"),
		AppPort:     v.GetString("APP_PORT"),
		RedisAddr:   v.GetString("REDIS_ADDR"),
		MySQLDSN:    v.GetString("MYSQL_DSN"),
		PostgresDSN: v.GetString("POSTGRES_DSN"),
		MongoDSN:    v.GetString("MONGO_DSN"),
	}, nil
}