"Upload image" clicked: what it looks like when the image was uploaded.
Probably needs a (x) in the upper right corner of the image to allow the
user to remove the image if a wrong one was selected. The image should
be uploaded to the actual gallery only when the user presses "post to
gallery", if possible!
<template>
  <div class="overlay new-image-dialog" @click="$emit('bgclick')">
    <div class="overlay-content" @click.stop="">

      <div
        class="area-image"
        :class="{'has-image': !!previewUrl, 'no-image': !previewUrl, droppable: droppable}"
        @drop="onDrop"
        @dragover="onDragover"
        @dragleave="onDragleave">
        <!-- TODO: ...  -->
        <div v-if="previewUrl" class="has-image">
          <span class="remove btn" @click="previewUrl=''">X</span>
          <responsive-image :src="previewUrl" />
        </div>
        <div v-else>
          <label class="upload">
            <input type="file" style="display: none" @change="onFileSelect" accept="image/*" />
            <span class="btn">Upload File</span>
          </label>
        </div>
      </div>

      <div class="area-settings">
        <table>
          <tr>
            <td><label>Title</label></td>
            <td><input type="text" v-model="title" placeholder="Flower by @artist" /></td>
          </tr>
          <tr>
            <td colspan="2">
              <div class="hint">Feel free to leave a credit to the artist/photographer in the title :)</div>
            </td>
          </tr>
          <tr>
            <!-- TODO: autocomplete tags -->
            <td><label>Tags</label></td>
            <td>
              <tags-input v-model="tags" :autocompleteTags="autocompleteTags" />
            </td>
          </tr>
        </table>
      </div>

      <div class="area-buttons">
        <button class="btn" :disabled="!canPostToGallery" @click="postToGallery">🖼️ Post to gallery</button>
        <button class="btn" :disabled="!canSetupGameClick" @click="setupGameClick">🧩 Post to gallery <br /> + set up game</button>
      </div>

    </div>
  </div>
</template>
<script lang="ts">
import { defineComponent } from 'vue'
import { logger } from '../../common/Util'

import ResponsiveImage from './ResponsiveImage.vue'
import TagsInput from './TagsInput.vue'

const log = logger('NewImageDialog.vue')

export default defineComponent({
  name: 'new-image-dialog',
  components: {
    ResponsiveImage,
    TagsInput,
  },
  props: {
    autocompleteTags: {
      type: Function,
    },
  },
  emits: {
    bgclick: null,
    setupGameClick: null,
    postToGalleryClick: null,
  },
  data () {
    return {
      previewUrl: '',
      file: null as File|null,
      title: '',
      tags: [] as string[],
      droppable: false,
    }
  },
  computed: {
    canPostToGallery (): boolean {
      return !!(this.previewUrl && this.file)
    },
    canSetupGameClick (): boolean {
      return !!(this.previewUrl && this.file)
    },
  },
  methods: {
    imageFromDragEvt (evt: DragEvent): DataTransferItem|null {
      const items = evt.dataTransfer?.items
      if (!items || items.length === 0) {
        return null
      }
      const item = items[0]
      if (!item.type.startsWith('image/')) {
        return null
      }
      return item
    },
    onFileSelect (evt: Event) {
      const target = (evt.target as HTMLInputElement)
      if (!target.files) return;
      const file = target.files[0]
      if (!file) return;

      this.preview(file)
    },
    preview (file: File) {
      const r = new FileReader()
      r.readAsDataURL(file)
      r.onload = (ev: any) => {
        this.previewUrl = ev.target.result
        this.file = file
      }
    },
    postToGallery () {
      this.$emit('postToGalleryClick', {
        file: this.file,
        title: this.title,
        tags: this.tags,
      })
    },
    setupGameClick () {
      this.$emit('setupGameClick', {
        file: this.file,
        title: this.title,
        tags: this.tags,
      })
    },
    onDrop (evt: DragEvent): boolean {
      this.droppable = false
      const img = this.imageFromDragEvt(evt)
      if (!img) {
        return false
      }
      const f = img.getAsFile()
      if (!f) {
        return false
      }
      this.file = f
      this.preview(f)
      evt.preventDefault()
      return false
    },
    onDragover (evt: DragEvent): boolean {
      const img = this.imageFromDragEvt(evt)
      if (!img) {
        return false
      }
      this.droppable = true
      evt.preventDefault()
      return false
    },
    onDragleave () {
      log.info('onDragleave')
      this.droppable = false
    },
  },
})
</script>

// TODO: scoped vs .new-image-dialog
<style>
.new-image-dialog .overlay-content {
  display: grid;
  grid-template-columns: auto 450px;
  grid-template-rows: auto;
  grid-template-areas:
    "image settings"
    "image buttons";
  height: 90%;
  width: 80%;
}
@media (max-width: 1400px) {
  .new-image-dialog .overlay-content {
    grid-template-columns: auto;
    grid-template-rows: 1fr min-content min-content;
    grid-template-areas:
      "image"
      "settings"
      "buttons";
  }
  .new-image-dialog .overlay-content .area-buttons .btn br {
    display: none;
  }
}

.new-image-dialog .area-image {
  grid-area: image;
  margin: .5em;
  border: solid 6px transparent;
}
.new-image-dialog .area-image.no-image {
  align-content: center;
  display: grid;
  text-align: center;
  border: solid 6px;
  position: relative;
}
.new-image-dialog .area-image.droppable {
  border: dashed 6px;
}
.area-image * {
  pointer-events: none;
}
.new-image-dialog .area-image .has-image {
  position: relative;
  width: 100%;
  height: 100%;
}
.new-image-dialog .area-image .has-image .remove {
  position: absolute;
  top: .5em;
  left: .5em;
}

.new-image-dialog .area-settings {
  grid-area: settings;
}

.new-image-dialog .area-settings table input[type="text"] {
  width: 100%;
  box-sizing: border-box;
}

.new-image-dialog .area-buttons {
  align-self: end;
  grid-area: buttons;
}
.new-image-dialog .area-buttons button {
  width: 100%;
  margin-top: .5em;
}
.new-image-dialog .upload {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  cursor: pointer;
}
.new-image-dialog .upload .btn {
  position: absolute;
  top: 50%;
  transform: translate(-50%,-50%);
}
</style>