package config

import (
	"log"
	"os"
	"strconv"

	"github.com/joho/godotenv"
)

type Config struct {
	AppEnv              string
	AppPort             string
	DBDsn               string
	JwtAccessSecret     string
	JwtRefreshSecret    string
	JwtAccessTTLMinutes int
	JwtRefreshTTLDays   int
	CorsAllowedOrigins  string
	SwaggerHost         string
	S3Endpoint          string
	S3AccessKey         string
	S3SecretKey         string
	S3Bucket            string
	S3Region            string
	FrontendURL         string
	EvolutionApiUrl     string
	EvolutionApiKey     string
	WhatsappInstanceSP  string
	WhatsappInstanceMG  string
}

func LoadConfig() *Config {
	err := godotenv.Load()
	if err != nil {
		log.Println("Warning: .env file not found")
	}

	return &Config{
		AppEnv:              getEnv("APP_ENV", "dev"),
		AppPort:             getEnvWithFallback("PORT", "APP_PORT", "8080"),
		DBDsn:               getEnv("DB_DSN", ""),
		JwtAccessSecret:     getEnv("JWT_ACCESS_SECRET", "secret"),
		JwtRefreshSecret:    getEnv("JWT_REFRESH_SECRET", "refresh_secret"),
		JwtAccessTTLMinutes: getEnvAsInt("JWT_ACCESS_TTL_MINUTES", 180),
		JwtRefreshTTLDays:   getEnvAsInt("JWT_REFRESH_TTL_DAYS", 30),
		CorsAllowedOrigins:  getEnv("CORS_ALLOWED_ORIGINS", "*"),
		SwaggerHost:         getEnv("SWAGGER_HOST", "localhost:8080"),
		S3Endpoint:          getEnv("S3_ENDPOINT", ""),
		S3AccessKey:         getEnv("S3_ACCESS_KEY", ""),
		S3SecretKey:         getEnv("S3_SECRET_KEY", ""),
		S3Bucket:            getEnv("S3_BUCKET", ""),
		S3Region:            getEnv("S3_REGION", "nyc1"),
		FrontendURL:         getEnv("FRONTEND_URL", "http://localhost:3000"),
		EvolutionApiUrl:     getEnv("EVOLUTION_API_URL", "https://others-evolution-api.nsowe9.easypanel.host"),
		EvolutionApiKey:     getEnv("EVOLUTION_API_KEY", "429683C4C977415CAAFCCE10F7D57E11"),
		WhatsappInstanceSP:  getEnv("WHATSAPP_INSTANCE_SP", "NANDO"),
		WhatsappInstanceMG:  getEnv("WHATSAPP_INSTANCE_MG", "NANDO"),
	}
}

func getEnv(key, fallback string) string {
	if value, ok := os.LookupEnv(key); ok {
		return value
	}
	return fallback
}

func getEnvAsInt(key string, fallback int) int {
	strValue := getEnv(key, "")
	if value, err := strconv.Atoi(strValue); err == nil {
		return value
	}
	return fallback
}

// getEnvWithFallback tenta a primeira variável, depois a segunda, depois o fallback
// Útil para compatibilidade com Dokku (PORT) e desenvolvimento local (APP_PORT)
func getEnvWithFallback(primary, secondary, fallback string) string {
	if value, ok := os.LookupEnv(primary); ok {
		return value
	}
	if value, ok := os.LookupEnv(secondary); ok {
		return value
	}
	return fallback
}