import * as React from "react"

import * as LabelPrimitive from "@radix-ui/react-label"

import { Slot } from "@radix-ui/react-slot"

import {

  Controller,

  FormProvider,

  useFormContext,

  useFormState,

  type ControllerProps,

  type FieldPath,

  type FieldValues,

} from "react-hook-form"

import { cn } from "@/lib/utils"

import { Label } from "@/components/ui/label"

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 } = useFormContext()

  const formState = useFormState({ name: fieldContext.name })

  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

)

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 { 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}

    >

      {body}

    </p>

  )

}

export {

  useFormField,

  Form,

  FormItem,

  FormLabel,

  FormControl,

  FormDescription,

  FormMessage,

  FormField,

}