init

internal/validator/category_validator.go

@@ -0,0 +1,122 @@
+package validator
+
+import (
+	"errors"
+	"strings"
+
+	"apskel-pos-be/internal/constants"
+	"apskel-pos-be/internal/contract"
+)
+
+type CategoryValidator interface {
+	ValidateCreateCategoryRequest(req *contract.CreateCategoryRequest) (error, string)
+	ValidateUpdateCategoryRequest(req *contract.UpdateCategoryRequest) (error, string)
+	ValidateListCategoriesRequest(req *contract.ListCategoriesRequest) (error, string)
+}
+
+type CategoryValidatorImpl struct{}
+
+func NewCategoryValidator() *CategoryValidatorImpl {
+	return &CategoryValidatorImpl{}
+}
+
+func (v *CategoryValidatorImpl) ValidateCreateCategoryRequest(req *contract.CreateCategoryRequest) (error, string) {
+	if req == nil {
+		return errors.New("request body is required"), constants.MissingFieldErrorCode
+	}
+
+	if strings.TrimSpace(req.Name) == "" {
+		return errors.New("name is required"), constants.MissingFieldErrorCode
+	}
+
+	if len(req.Name) < 1 || len(req.Name) > 255 {
+		return errors.New("name must be between 1 and 255 characters"), constants.MalformedFieldErrorCode
+	}
+
+	if req.Description != nil && len(*req.Description) > 1000 {
+		return errors.New("description cannot exceed 1000 characters"), constants.MalformedFieldErrorCode
+	}
+
+	if req.BusinessType != nil && strings.TrimSpace(*req.BusinessType) != "" {
+		validBusinessTypes := map[string]bool{
+			"restaurant": true,
+			"cafe":       true,
+			"bar":        true,
+			"fastfood":   true,
+			"retail":     true,
+		}
+		if !validBusinessTypes[*req.BusinessType] {
+			return errors.New("invalid business_type"), constants.MalformedFieldErrorCode
+		}
+	}
+
+	return nil, ""
+}
+
+func (v *CategoryValidatorImpl) ValidateUpdateCategoryRequest(req *contract.UpdateCategoryRequest) (error, string) {
+	if req == nil {
+		return errors.New("request body is required"), constants.MissingFieldErrorCode
+	}
+
+	// At least one field should be provided for update
+	if req.Name == nil && req.Description == nil && req.BusinessType == nil && req.Metadata == nil {
+		return errors.New("at least one field must be provided for update"), constants.MissingFieldErrorCode
+	}
+
+	if req.Name != nil {
+		if strings.TrimSpace(*req.Name) == "" {
+			return errors.New("name cannot be empty"), constants.MalformedFieldErrorCode
+		}
+		if len(*req.Name) < 1 || len(*req.Name) > 255 {
+			return errors.New("name must be between 1 and 255 characters"), constants.MalformedFieldErrorCode
+		}
+	}
+
+	if req.Description != nil && len(*req.Description) > 1000 {
+		return errors.New("description cannot exceed 1000 characters"), constants.MalformedFieldErrorCode
+	}
+
+	if req.BusinessType != nil && strings.TrimSpace(*req.BusinessType) != "" {
+		validBusinessTypes := map[string]bool{
+			"restaurant": true,
+			"cafe":       true,
+			"bar":        true,
+			"fastfood":   true,
+			"retail":     true,
+		}
+		if !validBusinessTypes[*req.BusinessType] {
+			return errors.New("invalid business_type"), constants.MalformedFieldErrorCode
+		}
+	}
+
+	return nil, ""
+}
+
+func (v *CategoryValidatorImpl) ValidateListCategoriesRequest(req *contract.ListCategoriesRequest) (error, string) {
+	if req == nil {
+		return errors.New("request is required"), constants.MissingFieldErrorCode
+	}
+
+	if req.Page < 1 {
+		return errors.New("page must be at least 1"), constants.MalformedFieldErrorCode
+	}
+
+	if req.Limit < 1 || req.Limit > 100 {
+		return errors.New("limit must be between 1 and 100"), constants.MalformedFieldErrorCode
+	}
+
+	if req.BusinessType != "" {
+		validBusinessTypes := map[string]bool{
+			"restaurant": true,
+			"cafe":       true,
+			"bar":        true,
+			"fastfood":   true,
+			"retail":     true,
+		}
+		if !validBusinessTypes[req.BusinessType] {
+			return errors.New("invalid business_type"), constants.MalformedFieldErrorCode
+		}
+	}
+
+	return nil, ""
+}