// Adapted from shadcn/ui, MIT (98a1fe67). See THIRD_PARTY_NOTICES.md.
"use client";

import * as React from "react";
import { cn } from "./_ynrlib/cn.js";
import type { Label as LabelPrimitive } from "./_ynrlib/radix-ui.js";
import { Slot } from "./_ynrlib/radix-ui.js";
import {
  Controller,
  FormProvider,
  useFormContext,
  useFormState,
  type ControllerProps,
  type FieldPath,
  type FieldValues,
} from "./_ynrlib/hook-form.js";

import { Label } from "./label.js";

export const HookForm = FormProvider;

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

const FormFieldContext = React.createContext<FormFieldContextValue | null>(
  null,
);

export const HookFormField = <
  TFieldValues extends FieldValues = FieldValues,
  TName extends FieldPath<TFieldValues> = FieldPath<TFieldValues>,
>({
  ...props
}: ControllerProps<TFieldValues, TName>) => {
  return (
    <FormFieldContext.Provider value={{ name: props.name }}>
      <Controller {...props} />
    </FormFieldContext.Provider>
  );
};

export const useHookFormField = () => {
  const fieldContext = React.useContext(FormFieldContext);
  const itemContext = React.useContext(FormItemContext);
  const form = useFormContext();
  if (!fieldContext || !itemContext || !form) {
    throw new Error(
      "useHookFormField requires HookForm, HookFormField and HookFormItem.",
    );
  }
  const { getFieldState } = form;
  const formState = useFormState({ name: fieldContext.name });
  const fieldState = getFieldState(fieldContext.name, formState);

  const { id } = itemContext;

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

type FormItemContextValue = {
  id: string;
};

const FormItemContext = React.createContext<FormItemContextValue | null>(null);

export function HookFormItem({
  className,
  ...props
}: React.ComponentProps<"div">) {
  const id = React.useId();

  return (
    <FormItemContext.Provider value={{ id }}>
      <div
        data-slot="form-item"
        className={cn("grid gap-2", className)}
        {...props}
      />
    </FormItemContext.Provider>
  );
}

export function HookFormLabel({
  className,
  ...props
}: React.ComponentProps<typeof LabelPrimitive.Root>) {
  const { error, formItemId } = useHookFormField();

  return (
    <Label
      data-slot="form-label"
      data-error={!!error}
      className={cn("data-[error=true]:text-destructive", className)}
      htmlFor={formItemId}
      {...props}
    />
  );
}

export function HookFormControl({
  ...props
}: React.ComponentProps<typeof Slot.Root>) {
  const { error, formItemId, formDescriptionId, formMessageId } =
    useHookFormField();

  return (
    <Slot.Root
      data-slot="form-control"
      id={formItemId}
      aria-describedby={
        !error
          ? `${formDescriptionId}`
          : `${formDescriptionId} ${formMessageId}`
      }
      aria-invalid={!!error}
      {...props}
    />
  );
}

export function HookFormDescription({
  className,
  ...props
}: React.ComponentProps<"p">) {
  const { formDescriptionId } = useHookFormField();

  return (
    <p
      data-slot="form-description"
      id={formDescriptionId}
      className={cn("text-sm text-muted-foreground", className)}
      {...props}
    />
  );
}

export function HookFormMessage({
  className,
  ...props
}: React.ComponentProps<"p">) {
  const { error, formMessageId } = useHookFormField();
  const body = error ? String(error?.message ?? "") : props.children;

  if (!body) {
    return null;
  }

  return (
    <p
      data-slot="form-message"
      id={formMessageId}
      className={cn("text-sm text-destructive", className)}
      {...props}
    >
      {body}
    </p>
  );
}

export { useForm } from "./_ynrlib/hook-form.js";