"use client";

import { Slot } from "@radix-ui/react-slot";
import * as React from "react";
import {
  Controller,
  FormProvider,
  useFormContext,
  useFormState,
} from "react-hook-form";

import { isKey, useTranslation } from "@turbostarter/i18n";
import { cn } from "@turbostarter/ui";

import type { Label as LabelPrimitive } from "radix-ui";
import type { ControllerProps, FieldPath, FieldValues } from "react-hook-form";

import { Label } from "#components/label";

const Form = FormProvider;

interface 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 } = useFormContext();
  const formState = useFormState({ name: fieldContext.name });
  const fieldState = getFieldState(fieldContext.name, formState);

  // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
  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,
  };
};

interface FormItemContextValue {
  id: string;
}

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

function FormItem({ 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>
  );
}

function FormLabel({
  className,
  ...props
}: React.ComponentProps<typeof LabelPrimitive.Root>) {
  const { error, formItemId } = useFormField();
  return (
    <Label
      data-slot="form-label"
      data-error={!!error}
      className={cn("data-[error=true]:text-destructive", className)}
      htmlFor={formItemId}
      {...props}
    />
  );
}

function FormControl({ ...props }: React.ComponentProps<typeof Slot>) {
  const { error, formItemId, formDescriptionId, formMessageId } =
    useFormField();
  return (
    <Slot
      data-slot="form-control"
      id={formItemId}
      aria-describedby={
        !error
          ? `${formDescriptionId}`
          : `${formDescriptionId} ${formMessageId}`
      }
      aria-invalid={!!error}
      {...props}
    />
  );
}

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

function FormMessage({ className, ...props }: React.ComponentProps<"p">) {
  const { t, i18n } = useTranslation();
  const { error, formMessageId } = useFormField();
  const body = error ? String(error.message) : props.children;
  if (!body) {
    return null;
  }
  return (
    <p
      data-slot="form-message"
      id={formMessageId}
      className={cn("text-destructive text-sm", className)}
      {...props}
    >
      {typeof body === "string" && isKey(body, i18n) ? t(body) : body}
    </p>
  );
}

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