1 files changed, 107 insertions, 0 deletions
diff --git a/customer/validators.go b/customer/validators.go
new file mode 100644
index 0000000..6c51ad9
--- /dev/null
+++ b/customer/validators.go
@@ -0,0 +1,107 @@
+/* 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 customer
+
+import (
+	"regexp"
+	"strings"
+	"vidhukant.com/openbills/errors"
+	e "errors"
+)
+
+// NOTE: very inefficient and really really really dumb but it works
+// TODO: find a better (or even a remotely good) way
+func validateContactField(field, value string) error {
+	if value != "" {
+		var count int64
+		err := db.Model(&CustomerContact{}).
+			Where(field + " = ?", value).
+			Count(&count).
+			Error
+
+		if err != nil {
+			return err
+		}
+
+		if count > 0 {
+			switch(field) {
+			case "phone":
+				return errors.ErrNonUniquePhone
+			case "email":
+				return errors.ErrNonUniqueEmail
+			case "website":
+				return errors.ErrNonUniqueWebsite
+			default:
+				return e.New(field + " is not unique")
+			}
+		}
+	}
+
+	return nil
+}
+
+func (c *CustomerContact) validate() error {
+	// trim whitespaces
+	c.Name = strings.TrimSpace(c.Name)
+	c.Phone = strings.TrimSpace(c.Phone)
+	c.Email = strings.TrimSpace(c.Email)
+	c.Website = strings.TrimSpace(c.Website)
+
+	var err error
+	for _, i := range [][]string{{"phone", c.Phone}, {"email", c.Email}, {"website", c.Website}} {
+		err = validateContactField(i[0], i[1])
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func (c *Customer) validate() error {
+	// trim whitespaces
+	c.Name = strings.TrimSpace(c.Name)
+	c.Gstin = strings.TrimSpace(c.Gstin)
+
+	// don't validate if GSTIN is empty
+	if c.Gstin != "" {
+	  // GSTIN regex validation
+		match, _ := regexp.MatchString("^[0-9]{2}[A-Z]{5}[0-9]{4}[A-Z]{1}[1-9A-Z]{1}Z[0-9A-Z]{1}$", c.Gstin)
+		if (!match) {
+			return errors.ErrInvalidGSTIN
+		}
+
+		// make sure GSTIN is unique
+		var count int64
+		err := db.Model(&Customer{}).
+			Select("gstin").
+			Where("gstin = ?", c.Gstin).
+			Count(&count).
+			Error
+
+		if err != nil {
+			return err
+		}
+
+		if count > 0 {
+			return errors.ErrNonUniqueGSTIN
+		}
+	}
+
+	return nil
+}