refactor: enforce frontend view model boundaries

src/entities/bank-card/ui/BankCardForm/BankCardFields.vm.ts

@@ -0,0 +1,76 @@
+import type { ComponentProps } from "react";
+
+import { DateInput } from "@mantine/dates";
+import { useController, useFormContext } from "react-hook-form";
+import { useTranslation } from "react-i18next";
+
+import { bankDateInputValue } from "../../model/form-validation";
+import { type BankCardValues, bankDateSchema } from "../../model/form.schema";
+
+function useBankCardFieldsVm() {
+	const {
+		control,
+		formState: { errors },
+		register,
+	} = useFormContext<BankCardValues>();
+
+	const { t } = useTranslation();
+
+	const { field: paymentSystemField } = useController({
+		control,
+		name: "paymentSystem",
+	});
+
+	const { field: openingDateField } = useController({
+		control,
+		name: "openingDate",
+	});
+
+	const paymentSystems = ["mir", "visa", "mastercard"].map(value => ({
+		label: t(`bank.paymentSystems.${value}`),
+		value,
+	}));
+
+	const onPaymentSystemChange: (value: null | string) => void = value =>
+		paymentSystemField.onChange(value ?? "");
+
+	const dateParser: ComponentProps<typeof DateInput>["dateParser"] = value =>
+		bankDateSchema.safeParse(bankDateInputValue(value)).success
+			? bankDateInputValue(value)
+			: null; // eslint-disable-line unicorn/no-null -- Mantine represents an empty controlled openingDateField as null.
+
+	const onOpeningDateBlur: ComponentProps<typeof DateInput>["onBlur"] = (
+		event,
+	) => {
+		openingDateField.onChange(bankDateInputValue(event.currentTarget.value));
+		openingDateField.onBlur();
+	};
+
+	const onOpeningDateChange: (value: null | string) => void = value =>
+		openingDateField.onChange(value ?? "");
+
+	const onOpeningDateInput: ComponentProps<typeof DateInput>["onInput"] = event =>
+		openingDateField.onChange(bankDateInputValue(event.currentTarget.value));
+
+	const openingDateValue = bankDateSchema.safeParse(openingDateField.value)
+		.success
+		? openingDateField.value
+		: undefined;
+
+	return {
+		dateParser,
+		errors,
+		onOpeningDateBlur,
+		onOpeningDateChange,
+		onOpeningDateInput,
+		onPaymentSystemChange,
+		openingDateField,
+		openingDateValue,
+		paymentSystemField,
+		paymentSystems,
+		register,
+		t,
+	};
+}
+
+export { useBankCardFieldsVm };