<div class="{{backdropClass}}"
     tabindex="-1"
     data-a11y-dialog-hide
></div>
<div class="{{contentsClass}}"
     role="dialog"
     aria-label="{{label || ''}}"
     ref:node
>
  <div class="modal-dialog-document" role="document" style="background: {{background || '#000'}};">
    <div class="modal-dialog-header">
      {{#if title}}
        <h1 class="modal-dialog-title">{{title}}</h1>
      {{/if}}
      <div class="close-dialog-button-wrapper">
        <button class="close-dialog-button"
                data-a11y-dialog-hide aria-label="Close dialog">
          <svg class="close-dialog-button-svg">
            <use xlink:href="#fa-times" />
          </svg>
        </button>
      </div>
    </div>
    <slot></slot>
  </div>
</div>
<style>
  :global(.modal-dialog[aria-hidden='true']) {
    display: none;
  }
  .modal-dialog-backdrop {
    position: fixed;
    z-index: 10000;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
    background: rgba(51, 51, 51, 0.9);
  }
  .modal-dialog-backdrop.should-animate {
    transition: opacity 0.2s linear;
  }
  .modal-dialog-contents {
    z-index: 10010;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    -webkit-font-smoothing: antialiased; /* fix for transform:translate causing blurry text in Chrome/Safari */
    padding: 0;
    border: 1px solid var(--main-border);
    border-radius: 2px;
    display: flex;
    flex-direction: row;
    max-height: calc(100% - 20px);
  }
  .modal-dialog-contents.should-animate {
    transition: opacity 0.2s linear;
  }

  .modal-dialog-document {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    max-width: calc(100vw - 20px);
    flex: 1;
  }
  .modal-dialog-header {
    width: 100%;
    background: var(--nav-bg);
    display: flex;
    align-items: center;
  }
  .modal-dialog-title {
    color: var(--nav-text-color);
    padding: 2px 0 2px 10px;
    margin: 0;
    font-size: 1.5em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  .close-dialog-button-wrapper {
    flex: 1;
    display: flex;
    justify-content: flex-end;
  }
  .close-dialog-button {
    padding: 0;
    background: none;
    border: none;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .close-dialog-button-svg {
    padding: 10px;
    fill: var(--button-primary-text);
    width: 24px;
    height: 24px;
    flex: 1;
  }
  .muted-style .modal-dialog-header {
    background: var(--muted-modal-bg);
  }
  .muted-style .close-dialog-button:focus {
    outline: 2px solid var(--muted-modal-focus);
  }
  .muted-style .close-dialog-button:hover {
    background: var(--muted-modal-hover);
  }
  .muted-style.modal-dialog-contents {
    border: none;
  }
</style>
<script>
  import A11yDialog from 'a11y-dialog'
  import { classname } from '../../../_utils/classname'
  import { on, emit } from '../../../_utils/eventBus'

  export default {
    oncreate() {
      let dialogElement = this.refs.node.parentElement
      this._a11yDialog = new A11yDialog(dialogElement)
      this._a11yDialog.on('hide', () => {
        this._a11yDialog.destroy()
        emit('destroyDialog', this.get('id'))
        requestAnimationFrame(() => document.body.removeChild(dialogElement))
      })
      on('showDialog', this, this.showDialog)
      on('closeDialog', this, this.closeDialog)
    },
    data: () => ({
      // don't animate if we're showing a modal dialog on top of another modal dialog. it looks ugly
      shouldAnimate: !process.browser || document.getElementsByClassName('modal-dialog').length < 2
    }),
    computed: {
      backdropClass: (fadedIn, shouldAnimate) => {
        return classname(
          'modal-dialog-backdrop',
          !fadedIn && 'hidden',
          shouldAnimate && 'should-animate'
        )
      },
      contentsClass: (fadedIn, muted, shouldAnimate, className) => {
        return classname(
          'modal-dialog-contents',
          !fadedIn && 'hidden',
          muted && 'muted-style',
          shouldAnimate && 'should-animate',
          className
        )
      }
    },
    methods: {
      showDialog(id) {
        if (this.get('id') !== id) {
          return
        }
        this._a11yDialog.show()
        requestAnimationFrame(() => {
          this.set({ fadedIn: true })
        })
      },
      closeDialog(id) {
        if (this.get('id') !== id) {
          return
        }
        setTimeout(() => { // use setTimeout to workaround svelte timing issue
          this._a11yDialog.hide()
        }, 0)
      }
    }
  }
</script>