add breadcrumbs

internal/app/server.go

@@ -40,3 +40,11 @@ func (s *Server) GetProduct(ctx context.Context, req *crm.GetProductReq) (*crm.P
 	}
 	return &crm.ProductRsp{Product: product}, nil
 }
+
+func (s *Server) GetBreadcrumbs(ctx context.Context, req *crm.GetBreadcrumbsReq) (*crm.BreadcrumbsRsp, error) {
+	breadcrumbs, err := s.storage.GetBreadcrumbs(ctx, req.Id)
+	if err != nil {
+		return nil, err
+	}
+	return &crm.BreadcrumbsRsp{Categories: breadcrumbs}, nil
+}

internal/models/storage/interface.go

@@ -5,19 +5,9 @@ import (
 	"context"
 )
 
-type Product struct {
-	ID   int    `json:"id"`
-	Name string `json:"name"`
-	// todo
-}
-
-type Breadcrumb struct {
-	Name string `json:"name"`
-	URL  string `json:"url"`
-}
-
 type IStorage interface {
 	GetCatalog(ctx context.Context) ([]*crm.Category, error)
 	GetPositions(ctx context.Context, id int64) ([]*crm.Product, error)
 	GetProduct(ctx context.Context, id int64) (*crm.Product, error)
+	GetBreadcrumbs(ctx context.Context, id int64) ([]*crm.Category, error)
 }

internal/models/storage/storage_file/storage.go

@@ -65,3 +65,33 @@ func (s *storageFile) GetProduct(_ context.Context, id int64) (*crm.Product, err
 	}
 	return nil, ErrProductNotFound
 }
+
+func (s *storageFile) GetBreadcrumbs(_ context.Context, id int64) ([]*crm.Category, error) {
+	data, err := os.ReadFile("resources/catalog.json")
+	if err != nil {
+		return nil, err
+	}
+	var categories []*crm.Category
+	if err := json.Unmarshal(data, &categories); err != nil {
+		return nil, err
+	}
+	return getBreadcrumbs(categories, id), nil
+}
+
+func getBreadcrumbs(categories []*crm.Category, id int64) []*crm.Category {
+	for _, category := range categories {
+		if category.Id == id {
+			category.Children = nil
+			return []*crm.Category{category}
+		}
+		breadcrumbs := getBreadcrumbs(category.Children, id)
+		if len(breadcrumbs) != 0 {
+			res := make([]*crm.Category, 0, len(breadcrumbs)+1)
+			category.Children = nil
+			res = append(res, category)
+			res = append(res, breadcrumbs...)
+			return res
+		}
+	}
+	return nil
+}