import * as React from "react"
import * as LabelPrimitive from "@radix-ui/react-label"
import {Slot} from "@radix-ui/react-slot"

import {cn} from "@eloquent/styles"
import {Label} from "../Label/"
import {
    Controller,
    ControllerProps,
    FieldPath,
    FieldValues,
    FormProvider,
    useFormContext,
} from "react-hook-form"

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

    return (
        <FormItemContext.Provider value={{id}}>
    <div ref={ref} className={cn("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 {error, formItemId} = useFormField()

    return (
        <Label
            ref={ref}
    className={cn(error && "text-destructive", className)}
    htmlFor={formItemId}
    {...props}
    />
)
})
FormLabel.displayName = "FormLabel"

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

    return (
        <Slot
            ref={ref}
    id={formItemId}
    aria-describedby={
    !error
        ? `${formDescriptionId}`
        : `${formDescriptionId} ${formMessageId}`
}
    aria-invalid={!!error}
    {...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={cn("text-[0.8rem] text-muted-foreground", className)}
    {...props}
    />
)
})
FormDescription.displayName = "FormDescription"

const FormMessage = React.forwardRef<
    HTMLParagraphElement,
    React.HTMLAttributes<HTMLParagraphElement>
>(({className, children, ...props}, ref) => {
    const {error, formMessageId} = useFormField()
    const body = error ? String(error?.message) : children

    if (!body) {
        return null
    }

    return (
        <p
            ref={ref}
    id={formMessageId}
    className={cn("text-[0.8rem] font-medium text-destructive", className)}
    {...props}
>
    {body}
    </p>
)
})
FormMessage.displayName = "FormMessage"

export const Form = {
    useFormField,
    Provider,
    Item: FormItem,
    Label: FormLabel,
    Control: FormControl,
    Description: FormDescription,
    Message: FormMessage,
    Field: FormField,
}