twitch-clone/frontend/src/components/ui/common/Form.tsx

'use client';

import { Slot } from '@radix-ui/react-slot';
import {
  type ComponentPropsWithoutRef,
  type ComponentRef,
  type HTMLAttributes,
  createContext,
  forwardRef,
  useContext,
  useId,
} from 'react';
import {
  Controller,
  type ControllerProps,
  type FieldPath,
  type FieldValues,
  FormProvider,
  useFormContext,
} from 'react-hook-form';

import { cn } from '@/utils/tw-merge';

import { Label } from './Label';

import type * as LabelPrimitive from '@radix-ui/react-label';

const Form = FormProvider;

type FormFieldContextValue<
  TFieldValues extends FieldValues = FieldValues,
  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>,
> = {
  name: TName;
};

const FormFieldContext = createContext<FormFieldContextValue>(
  {} as FormFieldContextValue,
);

const FormField = <
  TFieldValues extends FieldValues = FieldValues,
  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>,
>({
  ...props
}: ControllerProps<TFieldValues, TName>) => (
  // eslint-disable-next-line react/jsx-no-constructed-context-values
  <FormFieldContext.Provider value={{ name: props.name }}>
    <Controller {...props} />
  </FormFieldContext.Provider>
);

type FormItemContextValue = {
  id: string;
};

const FormItemContext = createContext<FormItemContextValue>(
  {} as FormItemContextValue,
);

const FormItem = forwardRef<HTMLDivElement, HTMLAttributes<HTMLDivElement>>(
  ({ className, ...props }, ref) => {
    const id = useId();

    return (
      // eslint-disable-next-line react/jsx-no-constructed-context-values
      <FormItemContext.Provider value={{ id }}>
        <div
          ref={ref}
          className={cn('space-y-2', className)}
          {...props}
        />
      </FormItemContext.Provider>
    );
  },
);
FormItem.displayName = 'FormItem';

const useFormField = () => {
  const fieldContext = useContext(FormFieldContext);
  const itemContext = useContext(FormItemContext);
  const { getFieldState, formState } = useFormContext();

  const fieldState = getFieldState(fieldContext.name, formState);

  if (!fieldContext) {
    throw new Error('useFormField should be used within <FormField>');
  }

  const { id } = itemContext;

  return {
    id,
    name: fieldContext.name,
    formItemId: `${id}-form-item`,
    formDescriptionId: `${id}-form-item-description`,
    formMessageId: `${id}-form-item-message`,
    ...fieldState,
  };
};
const FormLabel = forwardRef<
  ComponentRef<typeof LabelPrimitive.Root>,
  ComponentPropsWithoutRef<typeof LabelPrimitive.Root>
>(({ className, ...props }, ref) => {
  const { error, formItemId } = useFormField();

  return (
    <Label
      ref={ref}
      className={cn(error && 'text-destructive', className)}
      htmlFor={formItemId}
      {...props}
    />
  );
});
FormLabel.displayName = 'FormLabel';

const FormControl = forwardRef<
  ComponentRef<typeof Slot>,
  ComponentPropsWithoutRef<typeof Slot>
>(({ ...props }, ref) => {
  const {
    error, formItemId, formDescriptionId, formMessageId,
  } = useFormField();

  return (
    <Slot
      ref={ref}
      aria-describedby={
        !error
          ? formDescriptionId
          : `${formDescriptionId} ${formMessageId}`
      }
      aria-invalid={!!error}
      id={formItemId}
      {...props}
    />
  );
});
FormControl.displayName = 'FormControl';

const FormDescription = forwardRef<
  HTMLParagraphElement,
  HTMLAttributes<HTMLParagraphElement>
>(({ className, ...props }, ref) => {
  const { formDescriptionId } = useFormField();

  return (
    <p
      ref={ref}
      className={cn('text-sm text-muted-foreground', className)}
      id={formDescriptionId}
      {...props}
    />
  );
});
FormDescription.displayName = 'FormDescription';

const FormMessage = forwardRef<
  HTMLParagraphElement,
  HTMLAttributes<HTMLParagraphElement>
>(({ className, children, ...props }, ref) => {
  const { error, formMessageId } = useFormField();
  const body = error ? String(error?.message) : children;

  if (!body) {
    return null;
  }

  return (
    <p
      ref={ref}
      className={cn('text-sm font-medium text-destructive', className)}
      id={formMessageId}
      {...props}
    >
      {body}
    </p>
  );
});
FormMessage.displayName = 'FormMessage';

export {
  Form,
  FormControl,
  FormDescription,
  FormField,
  FormItem,
  FormLabel,
  FormMessage,
  useFormField,
};