Revert "feat(loyalty): EnakPoint & EnakCoin" (#32)

This reverts merge commit 645da30, returning main to f0ff59f.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/repository/payment_code_repository.go

@@ -1,103 +0,0 @@
-package repository
-
-import (
-	"context"
-	"errors"
-	"fmt"
-	"strings"
-	"time"
-
-	"github.com/google/uuid"
-	"github.com/redis/go-redis/v9"
-)
-
-var (
-	// ErrPaymentCodeTaken means the code is already live for someone; draw another.
-	ErrPaymentCodeTaken = errors.New("payment code already in use")
-	// ErrPaymentCodeNotFound means the code does not exist: never issued, expired, or
-	// already used.
-	ErrPaymentCodeNotFound = errors.New("payment code not found")
-	// ErrPaymentCodeWrongCustomer means the code belongs to another customer.
-	ErrPaymentCodeWrongCustomer = errors.New("payment code belongs to another customer")
-)
-
-// PaymentCodeRepository keeps one-time EnakPoint payment codes in Redis
-// (docs/prd-point-coin.md F9). A code expires by TTL and is removed when used.
-type PaymentCodeRepository interface {
-	// Save stores a code for a customer for ttl, and retires the customer's previous
-	// code so only the newest one works. ErrPaymentCodeTaken if the code is live.
-	Save(ctx context.Context, code string, customerID uuid.UUID, ttl time.Duration) error
-	// Consume uses a code up if it belongs to the customer. A code of another customer
-	// is left in place, so a cashier scanning it against the wrong order does not burn
-	// it for its owner.
-	Consume(ctx context.Context, code string, customerID uuid.UUID) error
-}
-
-type paymentCodeRepository struct {
-	client *redis.Client
-}
-
-func NewPaymentCodeRepository(client *redis.Client) PaymentCodeRepository {
-	return &paymentCodeRepository{client: client}
-}
-
-func paymentCodeKey(code string) string { return "wallet:paycode:" + code }
-
-func paymentCodeCustomerKey(customerID uuid.UUID) string {
-	return "wallet:paycode:customer:" + customerID.String()
-}
-
-func (r *paymentCodeRepository) Save(ctx context.Context, code string, customerID uuid.UUID, ttl time.Duration) error {
-	ok, err := r.client.SetNX(ctx, paymentCodeKey(code), customerID.String(), ttl).Result()
-	if err != nil {
-		return fmt.Errorf("failed to store payment code: %w", err)
-	}
-	if !ok {
-		return ErrPaymentCodeTaken
-	}
-	previous, err := r.client.GetSet(ctx, paymentCodeCustomerKey(customerID), code).Result()
-	if err != nil && !errors.Is(err, redis.Nil) {
-		return fmt.Errorf("failed to track payment code: %w", err)
-	}
-	r.client.Expire(ctx, paymentCodeCustomerKey(customerID), ttl)
-	if previous != "" && previous != code {
-		// Only if it is still that customer's: the number may have been reissued.
-		if err := r.compareAndDelete(ctx, previous, customerID); err != nil && !errors.Is(err, ErrPaymentCodeNotFound) && !errors.Is(err, ErrPaymentCodeWrongCustomer) {
-			return err
-		}
-	}
-	return nil
-}
-
-// consumeScript deletes a code only if it belongs to the given customer, in one step.
-// Returns 1 when used up, 0 when missing, -1 when it belongs to someone else.
-var consumeScript = redis.NewScript(`
-local owner = redis.call('GET', KEYS[1])
-if not owner then return 0 end
-if owner ~= ARGV[1] then return -1 end
-redis.call('DEL', KEYS[1])
-return 1
-`)
-
-func (r *paymentCodeRepository) Consume(ctx context.Context, code string, customerID uuid.UUID) error {
-	code = strings.TrimSpace(code)
-	if code == "" {
-		return ErrPaymentCodeNotFound
-	}
-	return r.compareAndDelete(ctx, code, customerID)
-}
-
-func (r *paymentCodeRepository) compareAndDelete(ctx context.Context, code string, customerID uuid.UUID) error {
-	result, err := consumeScript.Run(ctx, r.client, []string{paymentCodeKey(code)}, customerID.String()).Int()
-	if err != nil {
-		return fmt.Errorf("failed to use payment code: %w", err)
-	}
-	switch result {
-	case 1:
-		return nil
-	case -1:
-		return ErrPaymentCodeWrongCustomer
-	default:
-		return ErrPaymentCodeNotFound
-	}
-}