try to do better

frontend/src/utils/validation.ts

@@ -0,0 +1,52 @@
+export const validation = {
+  isValidEmail(email: string): boolean {
+    const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
+    return emailRegex.test(email);
+  },
+
+  isValidAmount(amount: string | number): boolean {
+    const num = typeof amount === 'string' ? parseFloat(amount) : amount;
+    return !isNaN(num) && num > 0;
+  },
+
+  isNonEmpty(value: string): boolean {
+    return value.trim().length > 0;
+  },
+
+  minLength(value: string, min: number): boolean {
+    return value.trim().length >= min;
+  },
+
+  maxLength(value: string, max: number): boolean {
+    return value.trim().length <= max;
+  },
+
+  isPositiveNumber(value: string | number): boolean {
+    const num = typeof value === 'string' ? parseFloat(value) : value;
+    return !isNaN(num) && num > 0;
+  },
+
+  isNonNegativeNumber(value: string | number): boolean {
+    const num = typeof value === 'string' ? parseFloat(value) : value;
+    return !isNaN(num) && num >= 0;
+  },
+
+  validateForm<T extends Record<string, any>>(
+    values: T,
+    rules: Partial<Record<keyof T, (value: any) => string | null>>
+  ): Partial<Record<keyof T, string>> {
+    const errors: Partial<Record<keyof T, string>> = {};
+
+    for (const field in rules) {
+      const validator = rules[field];
+      if (validator) {
+        const error = validator(values[field]);
+        if (error) {
+          errors[field] = error;
+        }
+      }
+    }
+
+    return errors;
+  },
+};