<span class="compose-box-length {{overLimit ? 'over-char-limit' : ''}}"
      aria-label="{{inputLengthLabel}}">
      {{inputLengthToDisplayAfterRaf || '0'}}
    </span>
<style>
  .compose-box-length {
    grid-area: length;
    justify-self: right;
    color: var(--main-theme-color);
    font-size: 1.3em;
    align-self: center;
  }

  .compose-box-length.over-char-limit {
    color: var(--warning-color);
  }
</style>
<script>
  import { CHAR_LIMIT } from '../../_static/statuses'
  import { mark, stop } from '../../_utils/marks'

  export default {
    oncreate() {
      // Avoid input delays by updating these values after a rAF
      this.observe('inputLengthToDisplay', inputLengthToDisplay => {
        requestAnimationFrame(() => {
          mark('set inputLengthToDisplayAfterRaf')
          this.set({inputLengthToDisplayAfterRaf: inputLengthToDisplay})
          stop('set inputLengthToDisplayAfterRaf')
        })
      })
    },
    computed: {
      overLimit: (inputLength) => inputLength > CHAR_LIMIT,
      inputLength: (inputText) => inputText ? inputText.length : 0,
      inputLengthToDisplay: (inputLength) => (inputLength <= CHAR_LIMIT ? inputLength : CHAR_LIMIT - inputLength),
      inputLengthLabel: (overLimit, inputLengthToDisplay) => {
        if (overLimit) {
          return `${inputLengthToDisplay} characters over limit`
        } else {
          return `${inputLengthToDisplay} characters`
        }
      }
    }
  }
</script>