# All files / src/components/ui form.tsx

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     import { ComponentProps, createContext, useContext, useId } from "react"
    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

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

    const FormFieldContext = 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 = useContext(FormFieldContext)
      const itemContext = 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,
      }
    }

    interface FormItemContextValue {
      id: string
    }

    const FormItemContext = createContext<FormItemContextValue>(
      {} as FormItemContextValue
    )

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

      return (
        <FormItemContext.Provider value={{ id }}>
          <div className={cn("mat-mdc-form-field", className)} {...props} />
        </FormItemContext.Provider>
      )
    }

    function FormLabel({ className, ...props }: ComponentProps<typeof Label>) {
      const { error, formItemId } = useFormField()

      return (
        <Label
          className={cn(error && "mat-error", className)}
          htmlFor={formItemId}
          {...props}
        />
      )
    }

    function FormControl({ className, ...props }: ComponentProps<"div">) {
      const { error, formItemId, formDescriptionId, formMessageId } = useFormField()

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

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

      return (
        <p
          id={formDescriptionId}
          className={cn("mat-mdc-form-field-hint", className)}
          {...props}
        />
      )
    }

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

      if (!body) {
        return null
      }

      return (
        <p
          id={formMessageId}
          className={cn("mat-mdc-form-field-error", className)}
          {...props}
        >
          {body}
        </p>
      )
    }

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