Crussell/backend/handlers/payments/handlers.go

package payments

import (
	"crussell/db"
	"crussell/internal/square"
	"crussell/internal/validators"
	"crussell/mw"
	"database/sql"
	"encoding/json"
	"errors"
	"log"
	"net/http"
	"strconv"
	"strings"
	"time"

	"github.com/go-chi/chi/v5"
	"github.com/jackc/pgx/v5"
)

type CreateTerminalPaymentRequest struct {
	Amount         int64   `json:"amount"`
	PaymentType    string  `json:"payment_type"`
	OverrideAmount *int64  `json:"override_amount,omitempty"`
	TipEnabled     bool    `json:"tip_enabled"`
	PaymentMethod  *string `json:"payment_method,omitempty"`
	GiftCardID     *string `json:"gift_card_id,omitempty"`
}

type CreateBookingPaymentRequest struct {
	Amount         int64   `json:"amount"`
	PaymentType    string  `json:"payment_type"`
	CardID         *string `json:"card_id,omitempty"`
	NewCardToken   *string `json:"new_card_token,omitempty"`
	SaveCard       bool    `json:"save_card"`
	IdempotencyKey string  `json:"idempotency_key"`
}

type RefundRequest struct {
	Amount int64  `json:"amount"`
	Reason string `json:"reason"`
}

type CreateTipPaymentRequest struct {
	Amount    int64  `json:"amount"`
	CardToken string `json:"card_token"`
}

type CheckoutResponse struct {
	CheckoutID string `json:"checkout_id"`
	Status     string `json:"status"`
}

type PaymentStatusResponse struct {
	Status     string `json:"status"`
	PaymentID  string `json:"payment_id,omitempty"`
	Amount     int64  `json:"amount,omitempty"`
	CardBrand  string `json:"card_brand,omitempty"`
	CardLast4  string `json:"card_last4,omitempty"`
	ReceiptURL string `json:"receipt_url,omitempty"`
}

type PaymentResponse struct {
	ID          string `json:"id"`
	BookingID   string `json:"booking_id"`
	PaymentType string `json:"payment_type"`
	Status      string `json:"status"`
	Amount      int64  `json:"amount"`
	CardBrand   string `json:"card_brand,omitempty"`
	CardLast4   string `json:"card_last4,omitempty"`
	ReceiptURL  string `json:"receipt_url,omitempty"`
	CreatedAt   string `json:"created_at"`
}

type RefundResponse struct {
	ID        string `json:"id"`
	PaymentID string `json:"payment_id"`
	Amount    int64  `json:"amount"`
	Status    string `json:"status"`
	Reason    string `json:"reason"`
	CreatedAt string `json:"created_at"`
}

type PaymentSummaryResponse struct {
	TotalAmount     int64             `json:"total_amount"`
	PaidAmount      int64             `json:"paid_amount"`
	RefundedAmount  int64             `json:"refunded_amount"`
	RemainingAmount int64             `json:"remaining_amount"`
	Payments        []PaymentResponse `json:"payments"`
	Refunds         []RefundResponse  `json:"refunds"`
}

func CreateTerminalPayment(w http.ResponseWriter, r *http.Request) {
	bookingID := chi.URLParam(r, "id")
	if bookingID == "" || !validators.IsValidID(bookingID) {
		http.Error(w, "Booking not found", http.StatusNotFound)
		return
	}

	adminID, ok := r.Context().Value(mw.UserIDKey).(string)
	if !ok || adminID == "" {
		http.Error(w, "Authentication required", http.StatusUnauthorized)
		return
	}

	var req CreateTerminalPaymentRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		log.Printf("Failed to decode terminal payment request: %v", err)
		http.Error(w, "invalid request", http.StatusBadRequest)
		return
	}

	if err := ValidateAmount(req.Amount); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	if err := ValidatePaymentType(req.PaymentType); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	service := NewPaymentService()

	status, err := service.GetBookingStatus(r.Context(), bookingID)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			http.Error(w, "Booking not found", http.StatusNotFound)
			return
		}
		log.Printf("Failed to get booking status: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	if status != "in_progress" && status != "completed" {
		http.Error(w, "Booking must be in_progress or completed to create payment", http.StatusBadRequest)
		return
	}

	amount := req.Amount
	if req.OverrideAmount != nil {
		amount = *req.OverrideAmount
	}

	idempotencyKey := bookingID + "-" + req.PaymentType + "-" + strconv.FormatInt(amount, 10)

	existingPayment, err := service.CheckIdempotency(r.Context(), bookingID, idempotencyKey)
	if err != nil {
		log.Printf("Failed to check idempotency: %v", err)
	}
	if existingPayment != nil {
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(CheckoutResponse{
			CheckoutID: existingPayment.ID,
			Status:     existingPayment.Status,
		})
		return
	}

	// Route based on payment method
	if req.PaymentMethod != nil && (*req.PaymentMethod == "cash" || *req.PaymentMethod == "giftcard") {
		tx, err := db.DB.Begin(r.Context())
		if err != nil {
			log.Printf("Failed to begin transaction: %v", err)
			http.Error(w, "internal server error", http.StatusInternalServerError)
			return
		}
		defer tx.Rollback(r.Context())

		amountPounds := float64(amount) / 100.0
		var paymentID string

		if *req.PaymentMethod == "cash" {
			err = tx.QueryRow(r.Context(), `
				INSERT INTO payments (
					booking_id, payment_type, payment_method, status, amount, created_by, created_at, updated_at
				) VALUES ($1, $2, 'cash', 'completed', $3, $4, NOW(), NOW())
				RETURNING id
			`, bookingID, req.PaymentType, amountPounds, adminID).Scan(&paymentID)
			if err != nil {
				log.Printf("Failed to create cash payment record: %v", err)
				http.Error(w, "internal server error", http.StatusInternalServerError)
				return
			}
		} else { // giftcard
			var customerID sql.NullString
			err = tx.QueryRow(r.Context(), "SELECT user_id FROM bookings WHERE id = $1", bookingID).Scan(&customerID)
			if err != nil {
				log.Printf("Failed to query booking user: %v", err)
				http.Error(w, "internal server error", http.StatusInternalServerError)
				return
			}

			usedBalance := false
			if customerID.Valid {
				var balance float64
				err = tx.QueryRow(r.Context(), "SELECT balance FROM user_giftcard_balances WHERE user_id = $1 FOR UPDATE", customerID.String).Scan(&balance)
				if err == nil {
					if balance < amountPounds {
						http.Error(w, "Insufficient gift card balance on user account", http.StatusBadRequest)
						return
					}
					// Deduct from account balance
					_, err = tx.Exec(r.Context(), "UPDATE user_giftcard_balances SET balance = balance - $1, updated_at = NOW() WHERE user_id = $2", amountPounds, customerID.String)
					if err != nil {
						log.Printf("Failed to deduct user balance: %v", err)
						http.Error(w, "internal server error", http.StatusInternalServerError)
						return
					}
					usedBalance = true
				} else if !errors.Is(err, pgx.ErrNoRows) {
					log.Printf("Failed to query user balance: %v", err)
					http.Error(w, "internal server error", http.StatusInternalServerError)
					return
				}
			}

			if !usedBalance {
				// Try direct card redemption (for guests or users without a redeemed balance)
				if req.GiftCardID == nil || *req.GiftCardID == "" {
					http.Error(w, "Gift card ID is required", http.StatusBadRequest)
					return
				}
				cleanCardID := validators.NormalizeGiftCardCode(*req.GiftCardID)

				var gcRemaining float64
				var redeemedBy sql.NullString
				err = tx.QueryRow(r.Context(), "SELECT amount_remaining, redeemed_by FROM gift_cards WHERE id = $1 FOR UPDATE", cleanCardID).Scan(&gcRemaining, &redeemedBy)
				if err != nil {
					if errors.Is(err, pgx.ErrNoRows) {
						http.Error(w, "Gift card not found", http.StatusNotFound)
						return
					}
					log.Printf("Failed to query gift card: %v", err)
					http.Error(w, "internal server error", http.StatusInternalServerError)
					return
				}

				if redeemedBy.Valid {
					http.Error(w, "This gift card has already been redeemed to an account. Please pay using the account balance.", http.StatusBadRequest)
					return
				}

				if gcRemaining < amountPounds {
					http.Error(w, "Insufficient balance on gift card", http.StatusBadRequest)
					return
				}

				// Deduct directly from card remaining amount
				_, err = tx.Exec(r.Context(), "UPDATE gift_cards SET amount_remaining = amount_remaining - $1, last_used_at = NOW() WHERE id = $2", amountPounds, cleanCardID)
				if err != nil {
					log.Printf("Failed to deduct gift card amount: %v", err)
					http.Error(w, "internal server error", http.StatusInternalServerError)
					return
				}
			}

			err = tx.QueryRow(r.Context(), `
				INSERT INTO payments (
					booking_id, payment_type, payment_method, status, amount, created_by, created_at, updated_at
				) VALUES ($1, $2, 'giftcard', 'completed', $3, $4, NOW(), NOW())
				RETURNING id
			`, bookingID, req.PaymentType, amountPounds, adminID).Scan(&paymentID)
			if err != nil {
				log.Printf("Failed to create giftcard payment record: %v", err)
				http.Error(w, "internal server error", http.StatusInternalServerError)
				return
			}
		}

		if err := tx.Commit(r.Context()); err != nil {
			log.Printf("Failed to commit payment: %v", err)
			http.Error(w, "internal server error", http.StatusInternalServerError)
			return
		}

		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(CheckoutResponse{
			CheckoutID: paymentID,
			Status:     "COMPLETED",
		})
		return
	}

	checkoutReq := square.CreateCheckoutReq{
		Amount:         amount,
		Currency:       "GBP",
		IdempotencyKey: idempotencyKey,
		ReferenceID:    bookingID,
		TipEnabled:     req.TipEnabled,
	}

	checkout, err := SquareClient.CreateCheckout(r.Context(), checkoutReq)
	if err != nil {
		log.Printf("Failed to create checkout: %v", err)
		http.Error(w, "Failed to create payment", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(CheckoutResponse{
		CheckoutID: checkout.ID,
		Status:     checkout.Status,
	})
	_ = adminID
}

func GetCheckoutStatus(w http.ResponseWriter, r *http.Request) {
	checkoutID := chi.URLParam(r, "checkout_id")
	if checkoutID == "" {
		http.Error(w, "Checkout ID is required", http.StatusBadRequest)
		return
	}

	bookingID := r.URL.Query().Get("booking_id")
	if bookingID == "" {
		http.Error(w, "booking_id query parameter is required", http.StatusBadRequest)
		return
	}

	paymentResult, err := SquareClient.GetCheckout(r.Context(), checkoutID)
	if err != nil {
		if err.Error() == "checkout pending" {
			w.Header().Set("Content-Type", "application/json")
			json.NewEncoder(w).Encode(PaymentStatusResponse{Status: "PENDING"})
			return
		}
		log.Printf("Failed to get checkout status: %v", err)
		http.Error(w, "Failed to get checkout status", http.StatusInternalServerError)
		return
	}

	if paymentResult.Status == "COMPLETED" {
		service := NewPaymentService()

		existing, err := service.CheckIdempotency(r.Context(), bookingID, "")
		if err != nil {
			log.Printf("Failed to check for existing payment: %v", err)
		}
		if existing != nil && existing.SquarePaymentID != nil && *existing.SquarePaymentID == paymentResult.SquarePayID {
			w.Header().Set("Content-Type", "application/json")
			json.NewEncoder(w).Encode(PaymentStatusResponse{
				Status:     "COMPLETED",
				PaymentID:  existing.ID,
				Amount:     int64(existing.Amount * 100),
				CardBrand:  paymentResult.CardBrand,
				CardLast4:  paymentResult.CardLast4,
				ReceiptURL: paymentResult.ReceiptURL,
			})
			return
		}

		idempotencyKey := bookingID + "-terminal-" + strconv.FormatInt(paymentResult.Amount, 10)

		record := PaymentRecord{
			BookingID:       bookingID,
			PaymentType:     "full",
			PaymentMethod:   "in_person_card",
			Status:          "completed",
			Amount:          float64(paymentResult.Amount) / 100.0,
			SquarePaymentID: &paymentResult.SquarePayID,
			IdempotencyKey:  &idempotencyKey,
			Fees:            float64(paymentResult.Fees) / 100.0,
			CreatedAt:       time.Now(),
			UpdatedAt:       time.Now(),
		}

		paymentID, err := service.CreatePaymentRecord(r.Context(), record, nil)
		if err != nil {
			log.Printf("Failed to create payment record: %v", err)
			http.Error(w, "internal server error", http.StatusInternalServerError)
			return
		}

		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(PaymentStatusResponse{
			Status:     "COMPLETED",
			PaymentID:  paymentID,
			Amount:     paymentResult.Amount,
			CardBrand:  paymentResult.CardBrand,
			CardLast4:  paymentResult.CardLast4,
			ReceiptURL: paymentResult.ReceiptURL,
		})
		return
	}

	http.Error(w, "Payment failed", http.StatusPaymentRequired)
}

func CreateBookingPayment(w http.ResponseWriter, r *http.Request) {
	bookingID := chi.URLParam(r, "id")
	if bookingID == "" || !validators.IsValidID(bookingID) {
		http.Error(w, "Booking not found", http.StatusNotFound)
		return
	}

	userID, ok := r.Context().Value(mw.UserIDKey).(string)
	if !ok || userID == "" {
		http.Error(w, "Authentication required", http.StatusUnauthorized)
		return
	}

	var req CreateBookingPaymentRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		log.Printf("Failed to decode booking payment request: %v", err)
		http.Error(w, "invalid request", http.StatusBadRequest)
		return
	}

	if err := ValidateAmount(req.Amount); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	if err := ValidatePaymentType(req.PaymentType); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	if err := ValidateCardInfo(req.CardID, req.NewCardToken); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	service := NewPaymentService()

	if req.PaymentType == "partial" {
		remainingCents, err := service.GetBookingRemainingBalanceCents(r.Context(), bookingID)
		if err != nil {
			log.Printf("Failed to get remaining balance: %v", err)
			http.Error(w, "internal server error", http.StatusInternalServerError)
			return
		}
		if err := ValidatePartialAmount(req.Amount, remainingCents); err != nil {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
	}

	bookingUserID, err := service.GetBookingUserID(r.Context(), bookingID)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			http.Error(w, "Booking not found", http.StatusNotFound)
			return
		}
		log.Printf("Failed to get booking user: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	if bookingUserID != userID {
		http.Error(w, "Unauthorized", http.StatusForbidden)
		return
	}

	existingPayment, err := service.CheckIdempotency(r.Context(), bookingID, req.IdempotencyKey)
	if err != nil {
		log.Printf("Failed to check idempotency: %v", err)
	}
	if existingPayment != nil {
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(PaymentResponse{
			ID:          existingPayment.ID,
			BookingID:   existingPayment.BookingID,
			PaymentType: existingPayment.PaymentType,
			Status:      existingPayment.Status,
			Amount:      int64(existingPayment.Amount * 100),
			CreatedAt:   existingPayment.CreatedAt.Format(time.RFC3339),
		})
		return
	}

	var sourceID string
	var savedCardID *string

	if req.NewCardToken != nil && *req.NewCardToken != "" {
		cardOnFile, err := SquareClient.CreateCardOnFile(r.Context(), userID, *req.NewCardToken)
		if err != nil {
			log.Printf("Failed to create card on file: %v", err)
			http.Error(w, "Failed to process card", http.StatusInternalServerError)
			return
		}

		sourceID = cardOnFile.CardID

		if req.SaveCard {
			cardID, err := service.SaveCardForUser(r.Context(), userID, cardOnFile.CardID, cardOnFile.Brand, cardOnFile.Last4, cardOnFile.ExpMonth, cardOnFile.ExpYear, cardOnFile.Fingerprint)
			if err != nil {
				log.Printf("Failed to save card: %v", err)
			} else {
				savedCardID = &cardID
			}
		}
	} else if req.CardID != nil {
		card, err := service.GetCardByID(r.Context(), *req.CardID, userID)
		if err != nil {
			if errors.Is(err, pgx.ErrNoRows) {
				http.Error(w, "Card not found", http.StatusNotFound)
				return
			}
			log.Printf("Failed to get card: %v", err)
			http.Error(w, "internal server error", http.StatusInternalServerError)
			return
		}
		sourceID = card.SquareCardID
		savedCardID = req.CardID
	}

	paymentReq := square.CreatePaymentReq{
		Amount:         req.Amount,
		Currency:       "GBP",
		SourceID:       sourceID,
		IdempotencyKey: req.IdempotencyKey,
		ReferenceID:    bookingID,
		Note:           req.PaymentType,
	}

	paymentResult, err := SquareClient.CreatePayment(r.Context(), paymentReq)
	if err != nil {
		log.Printf("Failed to create payment: %v", err)
		http.Error(w, "Payment failed", http.StatusPaymentRequired)
		return
	}

	fees := service.CalculateFees(req.Amount, "online")

	record := PaymentRecord{
		BookingID:       bookingID,
		PaymentType:     req.PaymentType,
		PaymentMethod:   "online_square",
		Status:          "completed",
		Amount:          float64(req.Amount) / 100.0,
		SquarePaymentID: &paymentResult.SquarePayID,
		IdempotencyKey:  &req.IdempotencyKey,
		Fees:            float64(fees) / 100.0,
		UserSavedCardID: savedCardID,
		CreatedAt:       time.Now(),
		UpdatedAt:       time.Now(),
		CreatedBy:       &userID,
	}

	paymentID, err := service.CreatePaymentRecord(r.Context(), record, nil)
	if err != nil {
		log.Printf("Failed to create payment record: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	if req.PaymentType == "deposit" {
		err = service.UpdateBookingDepositPaid(r.Context(), bookingID, true)
		if err != nil {
			log.Printf("Failed to update deposit paid: %v", err)
		}
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(PaymentResponse{
		ID:          paymentID,
		BookingID:   bookingID,
		PaymentType: req.PaymentType,
		Status:      "completed",
		Amount:      req.Amount,
		CardBrand:   paymentResult.CardBrand,
		CardLast4:   paymentResult.CardLast4,
		ReceiptURL:  paymentResult.ReceiptURL,
		CreatedAt:   time.Now().Format(time.RFC3339),
	})
}

func GetUserPaymentMethods(w http.ResponseWriter, r *http.Request) {
	userID, ok := r.Context().Value(mw.UserIDKey).(string)
	if !ok || userID == "" {
		http.Error(w, "Authentication required", http.StatusUnauthorized)
		return
	}

	service := NewPaymentService()
	cards, err := service.GetUserPaymentMethods(r.Context(), userID)
	if err != nil {
		log.Printf("Failed to get payment methods: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(cards)
}

func AdminGetUserPaymentMethods(w http.ResponseWriter, r *http.Request) {
	userID := chi.URLParam(r, "id")
	if userID == "" || !validators.IsValidID(userID) {
		http.Error(w, "Invalid user ID", http.StatusBadRequest)
		return
	}

	service := NewPaymentService()
	cards, err := service.GetUserPaymentMethods(r.Context(), userID)
	if err != nil {
		log.Printf("Failed to get payment methods for user %s: %v", userID, err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(cards)
}

func DeletePaymentMethod(w http.ResponseWriter, r *http.Request) {
	cardID := chi.URLParam(r, "id")
	if cardID == "" || !validators.IsValidID(cardID) {
		http.Error(w, "Payment method not found", http.StatusNotFound)
		return
	}

	userID, ok := r.Context().Value(mw.UserIDKey).(string)
	if !ok || userID == "" {
		http.Error(w, "Authentication required", http.StatusUnauthorized)
		return
	}

	service := NewPaymentService()
	err := service.DeletePaymentMethod(r.Context(), cardID, userID)
	if err != nil {
		log.Printf("Failed to delete payment method: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{"status": "deleted"})
}

type CreatePaymentMethodRequest struct {
	CardNumber string `json:"card_number"`
	Expiry     string `json:"expiry"`
	CVC        string `json:"cvc"`
}

func CreatePaymentMethod(w http.ResponseWriter, r *http.Request) {
	userID, ok := r.Context().Value(mw.UserIDKey).(string)
	if !ok || userID == "" {
		http.Error(w, "Authentication required", http.StatusUnauthorized)
		return
	}

	var req CreatePaymentMethodRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, "invalid request", http.StatusBadRequest)
		return
	}

	if req.CardNumber == "" || req.Expiry == "" || req.CVC == "" {
		http.Error(w, "Card number, expiry, and CVC are required", http.StatusBadRequest)
		return
	}

	service := NewPaymentService()
	card, err := service.CreatePaymentMethodFromDetails(r.Context(), userID, req.CardNumber, req.Expiry, req.CVC)
	if err != nil {
		if strings.Contains(err.Error(), "invalid") || strings.Contains(err.Error(), "expired") {
			http.Error(w, err.Error(), http.StatusBadRequest)
			return
		}
		log.Printf("Failed to create payment method: %v", err)
		http.Error(w, "Failed to add card", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(card)
}

func RefundPayment(w http.ResponseWriter, r *http.Request) {
	paymentID := chi.URLParam(r, "payment_id")
	if paymentID == "" || !validators.IsValidID(paymentID) {
		http.Error(w, "Payment not found", http.StatusNotFound)
		return
	}

	adminID, ok := r.Context().Value(mw.UserIDKey).(string)
	if !ok || adminID == "" {
		http.Error(w, "Authentication required", http.StatusUnauthorized)
		return
	}

	var req RefundRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		log.Printf("Failed to decode refund request: %v", err)
		http.Error(w, "invalid request", http.StatusBadRequest)
		return
	}

	if err := ValidateAmount(req.Amount); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	if err := ValidateRefundReason(req.Reason); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	service := NewPaymentService()

	payment, err := service.GetPaymentByID(r.Context(), paymentID)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			http.Error(w, "Payment not found", http.StatusNotFound)
			return
		}
		log.Printf("Failed to get payment: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	if payment.Status != "completed" {
		http.Error(w, "Can only refund completed payments", http.StatusBadRequest)
		return
	}

	if payment.SquarePaymentID == nil {
		http.Error(w, "Payment has no Square reference", http.StatusBadRequest)
		return
	}

	alreadyRefunded, err := service.GetAlreadyRefundedAmount(r.Context(), paymentID)
	if err != nil {
		log.Printf("Failed to get already refunded amount: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	if req.Amount+alreadyRefunded > int64(payment.Amount*100) {
		http.Error(w, "Refund amount exceeds payment amount", http.StatusBadRequest)
		return
	}

	refundReq := square.RefundPaymentReq{
		PaymentID:      *payment.SquarePaymentID,
		Amount:         req.Amount,
		IdempotencyKey: paymentID + "-" + strconv.FormatInt(req.Amount, 10),
		Reason:         req.Reason,
	}

	refundResult, err := SquareClient.RefundPayment(r.Context(), refundReq)
	if err != nil {
		log.Printf("Failed to refund payment: %v", err)
		http.Error(w, "Refund failed", http.StatusInternalServerError)
		return
	}

	squareRefundID := refundResult.ID
	record := RefundRecord{
		PaymentID:      paymentID,
		BookingID:      payment.BookingID,
		Amount:         float64(req.Amount) / 100.0,
		SquareRefundID: &squareRefundID,
		Status:         "completed",
		Reason:         req.Reason,
		CreatedBy:      &adminID,
		CreatedAt:      time.Now(),
	}

	refundID, err := service.CreateRefundRecord(r.Context(), record)
	if err != nil {
		log.Printf("Failed to create refund record: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	if payment.PaymentType == "deposit" && (req.Amount+alreadyRefunded) >= int64(payment.Amount*100) {
		err = service.UpdateBookingDepositPaid(r.Context(), payment.BookingID, false)
		if err != nil {
			log.Printf("Failed to update deposit paid: %v", err)
		}
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(RefundResponse{
		ID:        refundID,
		PaymentID: paymentID,
		Amount:    req.Amount,
		Status:    "completed",
		Reason:    req.Reason,
		CreatedAt: time.Now().Format(time.RFC3339),
	})
}

func CreateTipPayment(w http.ResponseWriter, r *http.Request) {
	bookingID := chi.URLParam(r, "id")
	if bookingID == "" || !validators.IsValidID(bookingID) {
		http.Error(w, "Booking not found", http.StatusNotFound)
		return
	}

	userID, ok := r.Context().Value(mw.UserIDKey).(string)
	if !ok || userID == "" {
		http.Error(w, "Authentication required", http.StatusUnauthorized)
		return
	}

	var req CreateTipPaymentRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		log.Printf("Failed to decode tip payment request: %v", err)
		http.Error(w, "invalid request", http.StatusBadRequest)
		return
	}

	if err := ValidateAmount(req.Amount); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	if req.CardToken == "" {
		http.Error(w, "Card token is required", http.StatusBadRequest)
		return
	}

	service := NewPaymentService()

	bookingUserID, err := service.GetBookingUserID(r.Context(), bookingID)
	if err != nil {
		if errors.Is(err, pgx.ErrNoRows) {
			http.Error(w, "Booking not found", http.StatusNotFound)
			return
		}
		log.Printf("Failed to get booking user: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	if bookingUserID != userID {
		http.Error(w, "Unauthorized", http.StatusForbidden)
		return
	}

	hasCompleted, err := service.HasCompletedPayment(r.Context(), bookingID)
	if err != nil {
		log.Printf("Failed to check for completed payments: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	if !hasCompleted {
		http.Error(w, "Booking must have a completed payment before adding tip", http.StatusBadRequest)
		return
	}

	idempotencyKey := bookingID + "-tip-" + strconv.FormatInt(req.Amount, 10)

	paymentReq := square.CreatePaymentReq{
		Amount:         req.Amount,
		Currency:       "GBP",
		SourceID:       req.CardToken,
		IdempotencyKey: idempotencyKey,
		ReferenceID:    bookingID,
		Note:           "tip",
	}

	paymentResult, err := SquareClient.CreatePayment(r.Context(), paymentReq)
	if err != nil {
		log.Printf("Failed to create tip payment: %v", err)
		http.Error(w, "Payment failed", http.StatusPaymentRequired)
		return
	}

	record := PaymentRecord{
		BookingID:       bookingID,
		PaymentType:     "tip",
		PaymentMethod:   "online_square",
		Status:          "completed",
		Amount:          float64(req.Amount) / 100.0,
		SquarePaymentID: &paymentResult.SquarePayID,
		IdempotencyKey:  &idempotencyKey,
		Fees:            0,
		CreatedAt:       time.Now(),
		UpdatedAt:       time.Now(),
		CreatedBy:       &userID,
	}

	paymentID, err := service.CreatePaymentRecord(r.Context(), record, nil)
	if err != nil {
		log.Printf("Failed to create payment record: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(PaymentResponse{
		ID:          paymentID,
		BookingID:   bookingID,
		PaymentType: "tip",
		Status:      "completed",
		Amount:      req.Amount,
		CardBrand:   paymentResult.CardBrand,
		CardLast4:   paymentResult.CardLast4,
		ReceiptURL:  paymentResult.ReceiptURL,
		CreatedAt:   time.Now().Format(time.RFC3339),
	})
}

func GetBookingPaymentSummary(w http.ResponseWriter, r *http.Request) {
	bookingID := chi.URLParam(r, "id")
	if bookingID == "" || !validators.IsValidID(bookingID) {
		http.Error(w, "Booking not found", http.StatusNotFound)
		return
	}

	userID, _ := r.Context().Value(mw.UserIDKey).(string)
	userRole, _ := r.Context().Value(mw.UserRoleKey).(string)

	service := NewPaymentService()

	if userRole != "admin" && userID != "" {
		bookingUserID, err := service.GetBookingUserID(r.Context(), bookingID)
		if err != nil {
			if errors.Is(err, pgx.ErrNoRows) {
				http.Error(w, "Booking not found", http.StatusNotFound)
				return
			}
			log.Printf("Failed to get booking user: %v", err)
			http.Error(w, "internal server error", http.StatusInternalServerError)
			return
		}

		if bookingUserID != userID {
			http.Error(w, "Unauthorized", http.StatusForbidden)
			return
		}
	}

	summary, err := service.GetBookingPaymentSummary(r.Context(), bookingID)
	if err != nil {
		log.Printf("Failed to get payment summary: %v", err)
		http.Error(w, "internal server error", http.StatusInternalServerError)
		return
	}

	payments := make([]PaymentResponse, len(summary.Payments))
	for i, p := range summary.Payments {
		payments[i] = PaymentResponse{
			ID:          p.ID,
			BookingID:   p.BookingID,
			PaymentType: p.PaymentType,
			Status:      p.Status,
			Amount:      int64(p.Amount * 100),
			CardLast4:   p.CardLast4,
			CreatedAt:   p.CreatedAt.Format(time.RFC3339),
		}
	}

	refunds := make([]RefundResponse, len(summary.Refunds))
	for i, rf := range summary.Refunds {
		refunds[i] = RefundResponse{
			ID:        rf.ID,
			PaymentID: rf.PaymentID,
			Amount:    int64(rf.Amount * 100),
			Status:    rf.Status,
			Reason:    rf.Reason,
			CreatedAt: rf.CreatedAt.Format(time.RFC3339),
		}
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(PaymentSummaryResponse{
		TotalAmount:     int64(summary.TotalAmount * 100),
		PaidAmount:      int64(summary.PaidAmount * 100),
		RefundedAmount:  int64(summary.RefundedAmount * 100),
		RemainingAmount: int64(summary.RemainingAmount * 100),
		Payments:        payments,
		Refunds:         refunds,
	})
}