add shopping list and tag management

internal/service/shopping_list.go

@@ -0,0 +1,146 @@
+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 ShoppingListService struct {
+	listRepo repository.ShoppingListRepository
+	itemRepo repository.ListItemRepository
+}
+
+func NewShoppingListService(listRepo repository.ShoppingListRepository, itemRepo repository.ListItemRepository) *ShoppingListService {
+	return &ShoppingListService{
+		listRepo: listRepo,
+		itemRepo: itemRepo,
+	}
+}
+
+// List methods
+func (s *ShoppingListService) CreateList(spaceID, name string) (*model.ShoppingList, error) {
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return nil, fmt.Errorf("list name cannot be empty")
+	}
+
+	now := time.Now()
+	list := &model.ShoppingList{
+		ID:        uuid.NewString(),
+		SpaceID:   spaceID,
+		Name:      name,
+		CreatedAt: now,
+		UpdatedAt: now,
+	}
+
+	err := s.listRepo.Create(list)
+	if err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+func (s *ShoppingListService) GetListsForSpace(spaceID string) ([]*model.ShoppingList, error) {
+	return s.listRepo.GetBySpaceID(spaceID)
+}
+
+func (s *ShoppingListService) GetList(listID string) (*model.ShoppingList, error) {
+	return s.listRepo.GetByID(listID)
+}
+
+func (s *ShoppingListService) UpdateList(listID, name string) (*model.ShoppingList, error) {
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return nil, fmt.Errorf("list name cannot be empty")
+	}
+
+	list, err := s.listRepo.GetByID(listID)
+	if err != nil {
+		return nil, err
+	}
+
+	list.Name = name
+
+	err = s.listRepo.Update(list)
+	if err != nil {
+		return nil, err
+	}
+
+	return list, nil
+}
+
+func (s *ShoppingListService) DeleteList(listID string) error {
+	// First delete all items in the list
+	err := s.itemRepo.DeleteByListID(listID)
+	if err != nil {
+		return fmt.Errorf("failed to delete items in list: %w", err)
+	}
+	// Then delete the list itself
+	return s.listRepo.Delete(listID)
+}
+
+// Item methods
+func (s *ShoppingListService) AddItemToList(listID, name, createdBy string) (*model.ListItem, error) {
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return nil, fmt.Errorf("item name cannot be empty")
+	}
+
+	now := time.Now()
+	item := &model.ListItem{
+		ID:        uuid.NewString(),
+		ListID:    listID,
+		Name:      name,
+		IsChecked: false,
+		CreatedBy: createdBy,
+		CreatedAt: now,
+		UpdatedAt: now,
+	}
+
+	err := s.itemRepo.Create(item)
+	if err != nil {
+		return nil, err
+	}
+
+	return item, nil
+}
+
+func (s *ShoppingListService) GetItem(itemID string) (*model.ListItem, error) {
+	return s.itemRepo.GetByID(itemID)
+}
+
+func (s *ShoppingListService) GetItemsForList(listID string) ([]*model.ListItem, error) {
+	return s.itemRepo.GetByListID(listID)
+}
+
+func (s *ShoppingListService) UpdateItem(itemID, name string, isChecked bool) (*model.ListItem, error) {
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return nil, fmt.Errorf("item name cannot be empty")
+	}
+
+	item, err := s.itemRepo.GetByID(itemID)
+	if err != nil {
+		return nil, err
+	}
+
+	item.Name = name
+	item.IsChecked = isChecked
+
+	err = s.itemRepo.Update(item)
+	if err != nil {
+		return nil, err
+	}
+
+	return item, nil
+}
+
+func (s *ShoppingListService) DeleteItem(itemID string) error {
+	return s.itemRepo.Delete(itemID)
+}