import { ref } from 'vue'

export function useTypingAnimation() {
  const displayedText = ref('')
  let timer: number | null = null

  function runTypingAnimation(fullText: string, enabled: boolean): Promise<void> {
    return new Promise((resolve) => {
      if (!enabled) {
        displayedText.value = fullText
        resolve()
        return
      }

      displayedText.value = ''
      let index = 0

      const typeNextChar = () => {
        if (index < fullText.length) {
          displayedText.value += fullText[index]
          index++
          timer = window.setTimeout(typeNextChar, 30)
        } else {
          resolve()
        }
      }

      if (timer) {
        clearTimeout(timer)
        timer = null
      }

      typeNextChar()
    })
  }

  return {
    displayedText,
    runTypingAnimation,
  }
}