package config

import (
	"crypto/md5"
	"encoding/hex"
	"fmt"

	"github.com/spf13/viper"
)

type AppConfig struct {
	AppEnv          string
	AppPort         string
	RedisAddr       string
	MySQLDSN        string
	PostgresDSN     string
	MongoDSN        string
	MinIoEndpoint   string
	MinioAccessKey  string
	MinioSecretKey  string
	MinioBucketName string
}

type FwhApiConfig struct {
	FwhEnergy   string
	FwhOss      string
	FwhUser     string
	FwhPassword string
}

type FwhMqttConfig struct {
	FwhMqttBroker  string
	FwhMqttCaUrl   string
	FwhMqttCertUrl string
	FwhMqttKeyUrl  string
}

type Config struct {
	App     AppConfig
	FwhApi  FwhApiConfig
	FwhMqtt FwhMqttConfig
}

// 需先执行LoadConfig后才能读取ENV
// var APP_ENV string = "dev"
// var FWH_ENERGY string = "energy.franklinwh.com"
// var FWH_OSS string = "oss.franklinwh.com"
// var FWH_USER string = ""
// var FWH_PASSWORD string = "" // MD5 - PASSWORD

// 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）
	// APP
	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")
	v.SetDefault("MINIO_ENDPOINT", "localhost:9198")
	v.SetDefault("MINIO_ACCESS_KEY", "fwh-toolbox")
	v.SetDefault("MINIO_SECRET_KEY", "fwh-toolbox")
	v.SetDefault("MINIO_BUCKET_NAME", "fwh-toolbox")
	// FWH API
	v.SetDefault("FWH_ENERGY", "energy.fwh-toolbox.top")
	v.SetDefault("FWH_OSS", "energy-oss.fwh-toolbox.top")
	// FWH MQTT

	// 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")
	// FWH_ENERGY = v.GetString("FWH_ENERGY")
	// FWH_OSS = v.GetString("FWH_OSS")
	// FWH_USER = v.GetString("FWH_USER")
	// FWH_PASSWORD = v.GetString("FWH_PASSWORD")

	h := md5.New()
	h.Write([]byte(v.GetString("FWH_PASSWORD")))
	fwhApiPassword := hex.EncodeToString(h.Sum(nil))

	return &Config{
		App: AppConfig{
			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"),
			MinIoEndpoint:   v.GetString("MINIO_ENDPOINT"),
			MinioAccessKey:  v.GetString("MINIO_ACCESS_KEY"),
			MinioSecretKey:  v.GetString("MINIO_SECRET_KEY"),
			MinioBucketName: v.GetString("MINIO_BUCKET_NAME"),
		},
		FwhApi: FwhApiConfig{
			FwhEnergy:   v.GetString("FWH_ENERGY"),
			FwhOss:      v.GetString("FWH_OSS"),
			FwhUser:     v.GetString("FWH_USER"),
			FwhPassword: fwhApiPassword,
		},
		FwhMqtt: FwhMqttConfig{
			FwhMqttBroker:  v.GetString("FWH_MQTT_BROKER"),
			FwhMqttCaUrl:   v.GetString("FWH_MQTT_CA"),
			FwhMqttCertUrl: v.GetString("FWH_MQTT_CERT"),
			FwhMqttKeyUrl:  v.GetString("FWH_MQTT_KEY"),
		},
	}, nil
}