1 files changed, 111 insertions, 0 deletions
diff --git a/item/validators.go b/item/validators.go
new file mode 100644
index 0000000..09162ab
--- /dev/null
+++ b/item/validators.go
@@ -0,0 +1,111 @@
+/* openbills - Server for web based Libre Billing Software
+ * Copyright (C) 2023  Vidhu Kant Sharma <vidhukant@vidhukant.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package item
+
+import (
+	"strconv"
+	"strings"
+
+	"vidhukant.com/openbills/errors"
+)
+
+func (b *Brand) validate() error {
+	// trim whitespaces
+	b.Name = strings.TrimSpace(b.Name)
+
+	if b.Name == "" {
+		return errors.ErrEmptyBrandName
+	}
+
+	// make sure GSTIN is unique
+	var count int64
+	err := db.Model(&Brand{}).
+		Select("name").
+		Where("name = ?", b.Name).
+		Count(&count).
+		Error
+
+	if err != nil {
+		return err
+	}
+
+	if count > 0 {
+		return errors.ErrNonUniqueBrandName
+	}
+
+	return nil
+}
+
+func checkIfBrandExists(id uint) error {
+	// check if brand id is valid
+	var count int64
+	err := db.Model(&Brand{}).
+		Select("id").
+		Where("id = ?", id).
+		Count(&count).
+		Error
+
+	if err != nil {
+		return err
+  }
+
+	if count == 0 {
+		return errors.ErrBrandNotFound
+	}
+
+	return nil
+}
+
+func (i *SavedItem) validate() error {
+	// trim whitespaces
+	i.Name = strings.TrimSpace(i.Name)
+	i.Description = strings.TrimSpace(i.Description)
+	i.HSN = strings.TrimSpace(i.HSN)
+
+	var err error
+
+	// check if UnitPrice is float
+	_, err = strconv.ParseFloat(i.UnitPrice, 64)
+	if err != nil && strings.TrimSpace(i.UnitPrice) != "" {
+		return errors.ErrInvalidUnitPrice
+	}
+
+	// check if GSTPercentage is float
+	_, err = strconv.ParseFloat(i.GSTPercentage, 64)
+	if err != nil && strings.TrimSpace(i.GSTPercentage) != "" {
+		return errors.ErrInvalidGSTPercentage
+	}
+
+	// check if item with same name and brand already exists
+	var count int64
+	err = db.Model(&SavedItem{}).
+		Select("name, brand_id").
+		Where("brand_id = ? and name = ?", i.BrandID, i.Name).
+		Count(&count).
+		Error
+
+	if err != nil {
+		return err
+  }
+
+	if count != 0 {
+		return errors.ErrNonUniqueBrandItem
+	}
+
+	return nil
+}