package billing

import (
	"encoding/json"
	"fmt"
	"log"

	"git.linuxforward.com/byom/byom-onboard/internal/common/models"

	"github.com/stripe/stripe-go/v81"
	"github.com/stripe/stripe-go/v81/paymentintent"
	"github.com/stripe/stripe-go/v81/webhook"
)

type StripeClient struct {
	secretKey     string
	webhookSecret string
}

func NewStripeClient(secretKey, webhookSecret string) *StripeClient {
	stripe.Key = secretKey
	return &StripeClient{
		secretKey:     secretKey,
		webhookSecret: webhookSecret,
	}
}

func (s *StripeClient) CreatePaymentIntent(amount int64, currency string, paymentMethodID string) (*models.PaymentIntent, error) {
	params := &stripe.PaymentIntentParams{
		Amount:   stripe.Int64(amount),
		Currency: stripe.String(currency),
		AutomaticPaymentMethods: &stripe.PaymentIntentAutomaticPaymentMethodsParams{
			AllowRedirects: stripe.String("never"),
			Enabled:        stripe.Bool(true),
		},
	}

	if paymentMethodID != "" {
		params.PaymentMethod = stripe.String(paymentMethodID)
		params.Confirm = stripe.Bool(true)
	}

	pi, err := paymentintent.New(params)
	if err != nil {
		return nil, fmt.Errorf("error creating payment intent: %w", err)
	}

	return &models.PaymentIntent{
		ID:           pi.ID,
		ClientSecret: pi.ClientSecret,
		Amount:       pi.Amount,
		Currency:     string(pi.Currency),
		Status:       string(pi.Status),
	}, nil
}

func (s *StripeClient) HandleWebhook(payload []byte, signature string) error {
	event, err := webhook.ConstructEvent(payload, signature, s.webhookSecret)
	if err != nil {
		return fmt.Errorf("error verifying webhook signature: %w", err)
	}

	return s.processStripeEvent(event)
}

func (s *StripeClient) processStripeEvent(event stripe.Event) error {
	switch event.Type {
	case stripe.EventTypePaymentIntentSucceeded:
		return s.handlePaymentIntentSucceeded(event)
	case stripe.EventTypePaymentIntentPaymentFailed:
		return s.handlePaymentIntentFailed(event)
	// ... other event types
	default:
		log.Printf("Unhandled event type: %s", event.Type)
		return nil
	}
}

// Event handlers moved to separate methods
func (s *StripeClient) handlePaymentIntentSucceeded(event stripe.Event) error {
	var pi stripe.PaymentIntent
	if err := json.Unmarshal(event.Data.Raw, &pi); err != nil {
		return fmt.Errorf("error parsing PaymentIntent: %w", err)
	}
	log.Printf("PaymentIntent %s succeeded!", pi.ID)
	return nil
}

func (s *StripeClient) handlePaymentIntentFailed(event stripe.Event) error {
	var pi stripe.PaymentIntent
	if err := json.Unmarshal(event.Data.Raw, &pi); err != nil {
		return fmt.Errorf("error parsing PaymentIntent: %w", err)
	}
	log.Printf("PaymentIntent %s failed!", pi.ID)
	return nil
}