'use client';

import type * as LabelPrimitive from '@radix-ui/react-label';
import { Slot } from '@radix-ui/react-slot';
import {
  type FieldApi,
  type FieldComponent,
  type FormApi,
  useField,
} from '@tanstack/react-form';
import { type ZodValidator } from '@tanstack/zod-form-adapter';
import * as React from 'react';

import { cx } from '@/lib/utils';

import { Label } from '@/components/ui/Label';

type FormContextValue<TFormData = any> = FormApi<TFormData, ZodValidator>;

const FormContext = React.createContext<FormContextValue>(
  {} as FormContextValue,
);

interface FormProps<TFormData> extends React.HTMLAttributes<HTMLFormElement> {
  form: FormContextValue<TFormData>;
}

const Form = <TFormData,>({ form, ...props }: FormProps<TFormData>) => {
  return (
    <FormContext.Provider value={form}>
      <form
        onSubmit={async (e) => {
          e.preventDefault();
          e.stopPropagation();
          await form.handleSubmit();
        }}
        {...props}
      />
    </FormContext.Provider>
  );
};

type FormFieldContextValue = {
  name: string;
};

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

const FormField = <TFormData,>({
  name,
  children,
  ...props
}: FieldComponent<TFormData, ZodValidator> & {
  children: (
    fieldApi: FieldApi<unknown, string, undefined, undefined, unknown>,
  ) => React.ReactNode;
}) => {
  const { Field } = React.useContext(FormContext);
  return (
    <FormFieldContext.Provider value={{ name }}>
      <Field name={name} {...props}>
        {children}
      </Field>
    </FormFieldContext.Provider>
  );
};

const useFormField = () => {
  const fieldContext = React.useContext(FormFieldContext);
  const itemContext = React.useContext(FormItemContext);
  const formContext = React.useContext(FormContext);

  const fieldState = useField({
    form: formContext,
    name: fieldContext.name,
  });

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

  const { id } = itemContext;

  return {
    id,
    formItemId: `${id}-form-item`,
    formDescriptionId: `${id}-form-item-description`,
    formMessageId: `${id}-form-item-message`,
    ...fieldState,
  };
};

type FormItemContextValue = {
  id: string;
};

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

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

  return (
    <FormItemContext.Provider value={{ id }}>
      <div
        ref={ref}
        className={cx('relative space-y-2', className)}
        {...props}
      />
    </FormItemContext.Provider>
  );
});
FormItem.displayName = 'FormItem';

const FormLabel = React.forwardRef<
  React.ElementRef<typeof LabelPrimitive.Root>,
  React.ComponentPropsWithoutRef<typeof LabelPrimitive.Root>
>(({ className, ...props }, ref) => {
  const { state, formItemId } = useFormField();

  return (
    <Label
      ref={ref}
      className={cx(
        state.meta.errors.length > 0 && 'text-destructive',
        className,
      )}
      htmlFor={formItemId}
      {...props}
    />
  );
});
FormLabel.displayName = 'FormLabel';

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

  return (
    <Slot
      ref={ref}
      id={formItemId}
      aria-describedby={
        !(state.meta.errors.length > 0)
          ? `${formDescriptionId}`
          : `${formDescriptionId} ${formMessageId}`
      }
      aria-invalid={!!(state.meta.errors.length > 0)}
      {...props}
    />
  );
});
FormControl.displayName = 'FormControl';

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

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

const FormMessage = React.forwardRef<
  HTMLParagraphElement,
  React.HTMLAttributes<HTMLParagraphElement>
>(({ className, children, ...props }, ref) => {
  const { state, formMessageId } = useFormField();
  const body =
    state.meta.errors.length > 0
      ? String(state.meta.errors[0]).split(', ')[0]
      : children;

  if (!body) {
    return null;
  }

  return (
    <p
      ref={ref}
      id={formMessageId}
      className={cx(
        'absolute -translate-y-2 text-[0.8rem] font-medium text-destructive',
        className,
      )}
      {...props}
    >
      {body}
    </p>
  );
});
FormMessage.displayName = 'FormMessage';

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