Validation for prices and objection

src/common/validators/repair-line-amount-toman.validator.ts

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+import {
+  registerDecorator,
+  ValidationArguments,
+  ValidationOptions,
+  ValidatorConstraint,
+  ValidatorConstraintInterface,
+} from "class-validator";
+import {
+  REPAIR_LINE_AMOUNT_TOMAN,
+} from "src/constants/repair-amount-limits";
+import { parseMoneyAmountToman } from "src/utils/unicode-digits";
+
+export type RepairLineAmountTomanOptions = {
+  /** When true, `0` is valid (e.g. expert `price` / `salary` split where one side is zero). */
+  allowZero?: boolean;
+};
+
+@ValidatorConstraint({ name: "isRepairLineAmountToman", async: false })
+export class IsRepairLineAmountTomanConstraint
+  implements ValidatorConstraintInterface
+{
+  validate(value: unknown, args: ValidationArguments): boolean {
+    const [minToman, maxToman, allowZero] = args.constraints as [
+      number,
+      number,
+      boolean | undefined,
+    ];
+    if (value == null || value === "") return true;
+    const amount = parseMoneyAmountToman(value);
+    if (amount == null) return false;
+    if (allowZero && amount === 0) return true;
+    return amount >= minToman && amount <= maxToman;
+  }
+
+  defaultMessage(args: ValidationArguments): string {
+    const [minToman, maxToman, allowZero] = args.constraints as [
+      number,
+      number,
+      boolean | undefined,
+    ];
+    const zeroHint = allowZero ? " Use 0 where one side of price/salary is unused." : "";
+    return (
+      `Amount must be in Toman between ${minToman.toLocaleString("en-US")} and ${maxToman.toLocaleString("en-US")}.${zeroHint}`
+    );
+  }
+}
+
+/** Optional repair-line amount in Toman (digits only after unicode normalize). */
+export function IsRepairLineAmountToman(
+  options?: ValidationOptions & RepairLineAmountTomanOptions,
+) {
+  const { allowZero, ...validationOptions } = options ?? {};
+  return (object: object, propertyName: string) => {
+    registerDecorator({
+      target: object.constructor,
+      propertyName,
+      options: validationOptions,
+      constraints: [
+        REPAIR_LINE_AMOUNT_TOMAN.MIN,
+        REPAIR_LINE_AMOUNT_TOMAN.MAX,
+        allowZero === true,
+      ],
+      validator: IsRepairLineAmountTomanConstraint,
+    });
+  };
+}