import * as LabelPrimitive from "@radix-ui/react-label";
import { Slot } from "@radix-ui/react-slot";
import * as React from "react";
import {
  Controller,
  ControllerProps,
  FieldPath,
  FieldValues,
  FormProvider,
  useFormContext,
} from "react-hook-form";

import { Label } from "@/components/ui/label";
import { cn } from "@/lib/utils";

const Form = FormProvider;

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

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

const FormField = <
  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>
  );
};

const useFormField = () => {
  const fieldContext = React.useContext(FormFieldContext);
  const itemContext = React.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,
  };
};

type FormItemContextValue = {
  id: string;
};

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

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

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

const FormLabel: FCC<React.ComponentProps<typeof LabelPrimitive.Root>> = ({
  className,
  ...props
}) => {
  const { error, formItemId } = useFormField();

  return (
    <Label
      className={cn(error && "text-red-500 dark:text-red-900", className)}
      htmlFor={formItemId}
      {...props}
    />
  );
};
FormLabel.displayName = "FormLabel";

const FormControl: FCC<React.ComponentProps<typeof Slot>> = ({
  ...props
}: React.ComponentPropsWithRef<typeof Slot>) => {
  const { error, formItemId, formDescriptionId, formMessageId } =
    useFormField();

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

FormControl.displayName = "FormControl";

const FormDescription: FCC<React.ComponentProps<"p">> = ({
  className,
  ...props
}) => {
  const { formDescriptionId } = useFormField();

  return (
    <p
      id={formDescriptionId}
      className={cn(
        "text-[0.8rem] text-neutral-500 dark:text-neutral-400",
        className,
      )}
      {...props}
    />
  );
};
FormDescription.displayName = "FormDescription";

const FormMessage: FCC<React.ComponentProps<"p">> = ({
  className,
  children,
  ...props
}) => {
  const { error, formMessageId } = useFormField();
  const body = error ? String(error?.message) : children;

  if (!body) {
    return null;
  }

  return (
    <p
      id={formMessageId}
      className={cn(
        "text-[0.8rem] font-medium text-red-500 dark:text-red-900",
        className,
      )}
      {...props}
    >
      {body}
    </p>
  );
};
FormMessage.displayName = "FormMessage";

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