web/packages/design-system/lib/components/Input/utils.ts

import type { ChangeEvent, ChangeEventHandler, RefObject } from 'react'
import { useState, useEffect } from 'react'

interface ClearInputOptions {
  inputRef: RefObject<HTMLInputElement | null>
  onChange?: ChangeEventHandler<HTMLInputElement>
  value?: string | number | readonly string[]
  onRightIconClick?: () => void
}

/**
 * Clears an input field value, handling both controlled and uncontrolled components.
 * Works with React Aria Components Input which can be used standalone or within TextField.
 */
export function clearInput({
  inputRef,
  onChange,
  value,
}: ClearInputOptions): void {
  if (!inputRef.current) {
    return
  }

  const isControlled = value !== undefined

  if (isControlled && onChange) {
    // For controlled components: call onChange with a synthetic event
    const syntheticEvent = {
      target: { value: '' },
      currentTarget: inputRef.current,
    } as ChangeEvent<HTMLInputElement>
    onChange(syntheticEvent)
  } else {
    // For uncontrolled components: use native input value setter
    // This triggers React's change detection properly
    const nativeInputValueSetter = Object.getOwnPropertyDescriptor(
      window.HTMLInputElement.prototype,
      'value'
    )?.set

    if (nativeInputValueSetter) {
      nativeInputValueSetter.call(inputRef.current, '')
    } else {
      inputRef.current.value = ''
    }

    // Dispatch input event to trigger any listeners
    const inputEvent = new Event('input', {
      bubbles: true,
      cancelable: true,
    })
    inputRef.current.dispatchEvent(inputEvent)

    // Also dispatch change event
    const changeEvent = new Event('change', {
      bubbles: true,
      cancelable: true,
    })
    inputRef.current.dispatchEvent(changeEvent)
  }

  // Focus the input after clearing
  inputRef.current.focus()
}

/**
 * Hook to track whether an input has a value.
 * Works for both controlled and uncontrolled components.
 */
export function useInputHasValue(
  value: string | number | readonly string[] | undefined,
  inputRef: RefObject<HTMLInputElement | null>
): boolean {
  const [hasValue, setHasValue] = useState(() => {
    // For controlled components, check value prop
    if (value !== undefined) {
      return String(value ?? '').trim().length > 0
    }
    // For uncontrolled, check ref
    return String(inputRef.current?.value ?? '').trim().length > 0
  })

  // Sync with controlled value changes
  useEffect(() => {
    if (value !== undefined) {
      setHasValue(String(value ?? '').trim().length > 0)
    }
  }, [value])

  // For uncontrolled components, sync from ref on input events
  useEffect(() => {
    if (value !== undefined) {
      return // Controlled component, no need to listen
    }

    const input = inputRef.current
    if (!input) return

    const updateHasValue = (event?: Event) => {
      // Use setTimeout to ensure we read the value after React/React Aria Components
      // has fully processed the change, especially for operations like select-all + delete
      setTimeout(() => {
        const target = (event?.target as HTMLInputElement) || inputRef.current
        if (target) {
          setHasValue((target.value ?? '').trim().length > 0)
        }
      }, 0)
    }

    input.addEventListener('input', updateHasValue)
    // Also listen to change event as a fallback
    input.addEventListener('change', updateHasValue)
    return () => {
      input.removeEventListener('input', updateHasValue)
      input.removeEventListener('change', updateHasValue)
    }
  }, [value, inputRef])

  return hasValue
}