package santimpay

import (
	"fmt"
	"time"

	"github.com/SamuelTariku/FortuneBet-Backend/internal/config"
	"github.com/SamuelTariku/FortuneBet-Backend/internal/domain"
	"github.com/golang-jwt/jwt/v5"
)

type SantimPayClient interface {
	GenerateSignedToken(payload domain.SantimTokenPayload) (string, error)
	CheckTransactionStatus(id string)
}

type santimClient struct {
	cfg *config.Config
}

func NewSantimPayClient(cfg *config.Config) SantimPayClient {
	return &santimClient{
		cfg: cfg,
	}
}

func (c *santimClient) GenerateSignedToken(payload domain.SantimTokenPayload) (string, error) {
	now := time.Now().Unix()

	claims := jwt.MapClaims{
		"amount":        payload.Amount,
		"paymentReason": payload.Reason,
		"merchantId":    c.cfg.SANTIMPAY.MerchantID,
		"generated":     now,
	}

	// Optional fields
	if payload.PaymentMethod != "" {
		claims["paymentMethod"] = payload.PaymentMethod
	}
	if payload.PhoneNumber != "" {
		claims["phoneNumber"] = payload.PhoneNumber
	}

	token := jwt.NewWithClaims(jwt.SigningMethodES256, claims)

	privateKey, err := jwt.ParseECPrivateKeyFromPEM([]byte(c.cfg.SANTIMPAY.SecretKey))
	if err != nil {
		return "", fmt.Errorf("invalid private key: %w", err)
	}

	signedToken, err := token.SignedString(privateKey)
	if err != nil {
		return "", fmt.Errorf("signing failed: %w", err)
	}

	return signedToken, nil
}


func (c *santimClient) CheckTransactionStatus(id string) {
	// optional async checker — can log or poll transaction status
	fmt.Println("Checking transaction status for:", id)
}