runable

lib/core/utils/validators.dart

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+/// Utility class for input validation
+class Validators {
+  Validators._();
+
+  /// Validate email
+  static String? validateEmail(String? value) {
+    if (value == null || value.isEmpty) {
+      return 'Email is required';
+    }
+    final emailRegex = RegExp(r'^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$');
+    if (!emailRegex.hasMatch(value)) {
+      return 'Enter a valid email';
+    }
+    return null;
+  }
+
+  /// Validate required field
+  static String? validateRequired(String? value, {String? fieldName}) {
+    if (value == null || value.isEmpty) {
+      return '${fieldName ?? 'This field'} is required';
+    }
+    return null;
+  }
+
+  /// Validate price
+  static String? validatePrice(String? value) {
+    if (value == null || value.isEmpty) {
+      return 'Price is required';
+    }
+    final price = double.tryParse(value);
+    if (price == null) {
+      return 'Enter a valid price';
+    }
+    if (price <= 0) {
+      return 'Price must be greater than 0';
+    }
+    return null;
+  }
+
+  /// Validate quantity
+  static String? validateQuantity(String? value) {
+    if (value == null || value.isEmpty) {
+      return 'Quantity is required';
+    }
+    final quantity = int.tryParse(value);
+    if (quantity == null) {
+      return 'Enter a valid quantity';
+    }
+    if (quantity < 0) {
+      return 'Quantity cannot be negative';
+    }
+    return null;
+  }
+
+  /// Validate phone number
+  static String? validatePhone(String? value) {
+    if (value == null || value.isEmpty) {
+      return 'Phone number is required';
+    }
+    final phoneRegex = RegExp(r'^\+?[\d\s-]{10,}$');
+    if (!phoneRegex.hasMatch(value)) {
+      return 'Enter a valid phone number';
+    }
+    return null;
+  }
+}