feat: payment methods

internal/service/payment_method.go

@@ -0,0 +1,109 @@
+package service
+
+import (
+	"fmt"
+	"strings"
+	"time"
+
+	"git.juancwu.dev/juancwu/budgit/internal/model"
+	"git.juancwu.dev/juancwu/budgit/internal/repository"
+	"github.com/google/uuid"
+)
+
+type CreatePaymentMethodDTO struct {
+	SpaceID   string
+	Name      string
+	Type      model.PaymentMethodType
+	LastFour  string
+	CreatedBy string
+}
+
+type UpdatePaymentMethodDTO struct {
+	ID       string
+	Name     string
+	Type     model.PaymentMethodType
+	LastFour string
+}
+
+type PaymentMethodService struct {
+	methodRepo repository.PaymentMethodRepository
+}
+
+func NewPaymentMethodService(methodRepo repository.PaymentMethodRepository) *PaymentMethodService {
+	return &PaymentMethodService{
+		methodRepo: methodRepo,
+	}
+}
+
+func (s *PaymentMethodService) CreateMethod(dto CreatePaymentMethodDTO) (*model.PaymentMethod, error) {
+	name := strings.TrimSpace(dto.Name)
+	if name == "" {
+		return nil, fmt.Errorf("payment method name cannot be empty")
+	}
+	if dto.Type != model.PaymentMethodTypeCredit && dto.Type != model.PaymentMethodTypeDebit {
+		return nil, fmt.Errorf("invalid payment method type")
+	}
+	if len(dto.LastFour) != 4 {
+		return nil, fmt.Errorf("last four digits must be exactly 4 characters")
+	}
+
+	now := time.Now()
+	method := &model.PaymentMethod{
+		ID:        uuid.NewString(),
+		SpaceID:   dto.SpaceID,
+		Name:      name,
+		Type:      dto.Type,
+		LastFour:  &dto.LastFour,
+		CreatedBy: dto.CreatedBy,
+		CreatedAt: now,
+		UpdatedAt: now,
+	}
+
+	err := s.methodRepo.Create(method)
+	if err != nil {
+		return nil, err
+	}
+
+	return method, nil
+}
+
+func (s *PaymentMethodService) GetMethodsForSpace(spaceID string) ([]*model.PaymentMethod, error) {
+	return s.methodRepo.GetBySpaceID(spaceID)
+}
+
+func (s *PaymentMethodService) GetMethod(id string) (*model.PaymentMethod, error) {
+	return s.methodRepo.GetByID(id)
+}
+
+func (s *PaymentMethodService) UpdateMethod(dto UpdatePaymentMethodDTO) (*model.PaymentMethod, error) {
+	name := strings.TrimSpace(dto.Name)
+	if name == "" {
+		return nil, fmt.Errorf("payment method name cannot be empty")
+	}
+	if dto.Type != model.PaymentMethodTypeCredit && dto.Type != model.PaymentMethodTypeDebit {
+		return nil, fmt.Errorf("invalid payment method type")
+	}
+	if len(dto.LastFour) != 4 {
+		return nil, fmt.Errorf("last four digits must be exactly 4 characters")
+	}
+
+	method, err := s.methodRepo.GetByID(dto.ID)
+	if err != nil {
+		return nil, err
+	}
+
+	method.Name = name
+	method.Type = dto.Type
+	method.LastFour = &dto.LastFour
+
+	err = s.methodRepo.Update(method)
+	if err != nil {
+		return nil, err
+	}
+
+	return method, nil
+}
+
+func (s *PaymentMethodService) DeleteMethod(id string) error {
+	return s.methodRepo.Delete(id)
+}