package app

import (
	"fmt"
	"log"
	"os"

	"github.com/joho/godotenv"
)

var (
	Config *ConfigStruct
)

type ConfigStruct struct {
	Port          string
	MongoURI      string
	MongoDB       string
	RedisHost     string
	RedisPort     string
	RedisPass     string
	AdminEmail    string
	AdminPass     string
	RefreshSecret string
	RefreshExpiry string
	AccessSecret  string
	AccessExpiry  string
	Env           string
}

// LoadConfig loads environment variables into Config struct and validates required fields.
func LoadConfig() error {
	if _, exists := os.LookupEnv("MONGO_URI"); !exists {
		if err := godotenv.Load(); err != nil {
			log.Fatal("🔴 Failed to load .env file: ", err)
		}
	}

	Config = &ConfigStruct{
		Port:          getEnv("PORT", "8080"),
		MongoURI:      os.Getenv("MONGO_URI"),
		MongoDB:       getEnv("MONGO_DB", "test"),
		RedisHost:     os.Getenv("REDIS_HOST"),
		RedisPort:     os.Getenv("REDIS_PORT"),
		RedisPass:     os.Getenv("REDIS_PASSWORD"),
		AdminEmail:    os.Getenv("ADMIN_EMAIL"),
		AdminPass:     os.Getenv("ADMIN_PASSWORD"),
		RefreshSecret: os.Getenv("REFRESH_SECRET"),
		RefreshExpiry: os.Getenv("REFRESH_EXPIRY"),
		AccessSecret:  os.Getenv("ACCESS_SECRET"),
		AccessExpiry:  os.Getenv("ACCESS_EXPIRY"),
		Env:           os.Getenv("ENV"),
	}

	missing := ""
	if Config.Port == "" {
		missing += "PORT "
	}
	if Config.MongoURI == "" {
		missing += "MONGO_URI "
	}
	if Config.RedisHost == "" {
		missing += "REDIS_HOST "
	}
	if Config.RedisPort == "" {
		missing += "REDIS_PORT "
	}
	if Config.AccessSecret == "" {
		missing += "ACCESS_SECRET "
	}
	if Config.RefreshSecret == "" {
		missing += "REFRESH_SECRET "
	}
	if missing != "" {
		return fmt.Errorf("missing required environment variables: %s", missing)
	}
	return nil
}

// GetConfig returns the global config
func GetConfig() *ConfigStruct {
	return Config
}

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