package config

import (
	"crypto/rand"
	"encoding/hex"
	"log"
	"os"
	"strings"
)

type Config struct {
	AdminEmail           string
	AdminPassword        string
	SessionSecret        string
	UploadDir            string
	PublicBaseURL        string
	HeleketMerchantID    string
	HeleketPaymentAPIKey string
	HeleketCurrency      string
}

func Load() Config {
	cfg := Config{
		AdminEmail:           os.Getenv("ADMIN_EMAIL"),
		AdminPassword:        os.Getenv("ADMIN_PASSWORD"),
		SessionSecret:        os.Getenv("SESSION_SECRET"),
		UploadDir:            os.Getenv("UPLOAD_DIR"),
		PublicBaseURL:        strings.TrimRight(os.Getenv("PUBLIC_BASE_URL"), "/"),
		HeleketMerchantID:    os.Getenv("HELEKET_MERCHANT_ID"),
		HeleketPaymentAPIKey: os.Getenv("HELEKET_PAYMENT_API_KEY"),
		HeleketCurrency:      os.Getenv("HELEKET_CURRENCY"),
	}

	if cfg.HeleketCurrency == "" {
		cfg.HeleketCurrency = "RUB"
	}

	if cfg.UploadDir == "" {
		cfg.UploadDir = "/app/data/uploads"
	}

	if cfg.SessionSecret == "" {
		cfg.SessionSecret = randomSecret()
		log.Println("warning: SESSION_SECRET not set, using random value (sessions reset on restart)")
	}

	return cfg
}

func randomSecret() string {
	b := make([]byte, 32)
	if _, err := rand.Read(b); err != nil {
		panic(err)
	}
	return hex.EncodeToString(b)
}