  <template>
  <div>
    <div class="ui top attached tabular menu">
      <a :class="['item', {active: currentTab === 'summary'}]" @click="currentTab = 'summary'"><translate>Summary</translate></a>
      <a :class="['item', {active: currentTab === 'uploads'}]" @click="currentTab = 'uploads'">
        <translate>Uploading</translate>
        <div v-if="files.length === 0" class="ui label">
          0
        </div>
        <div v-else-if="files.length > uploadedFilesCount + erroredFilesCount" class="ui yellow label">
          {{ uploadedFilesCount + erroredFilesCount }}/{{ files.length }}
        </div>
        <div v-else :class="['ui', {'green': erroredFilesCount === 0}, {'red': erroredFilesCount > 0}, 'label']">
          {{ uploadedFilesCount + erroredFilesCount }}/{{ files.length }}
        </div>
      </a>
      <a :class="['item', {active: currentTab === 'processing'}]" @click="currentTab = 'processing'">
        <translate>Processing</translate>
        <div v-if="processableFiles === 0" class="ui label">
          0
        </div>
        <div v-else-if="processableFiles > processedFilesCount" class="ui yellow label">
          {{ processedFilesCount }}/{{ processableFiles }}
        </div>
        <div v-else :class="['ui', {'green': uploads.errored === 0}, {'red': uploads.errored > 0}, 'label']">
          {{ processedFilesCount }}/{{ processableFiles }}
        </div>
      </a>
    </div>

    <div :class="['ui', 'bottom', 'attached', 'segment', {hidden: currentTab != 'summary'}]">
      <h2 class="ui header"><translate>Upload new tracks</translate></h2>
      <div class="ui message">
        <p><translate>You are about to upload music to your library. Before proceeding, please ensure that:</translate></p>
        <ul>
          <li v-if="library.privacy_level != 'me'">
            You are not uploading copyrighted content in a public library, otherwise you may be infringing the law
          </li>
          <li>
            <translate>The music files you are uploading are tagged properly:</translate>
            <a href="http://picard.musicbrainz.org/" target='_blank'><translate>We recommend using Picard for that purpose.</translate></a>
          </li>
          <li>
            <translate>The uploaded music files are in OGG, Flac or MP3 format</translate>
          </li>
        </ul>
      </div>

      <div class="ui form">
        <div class="fields">
          <div class="ui four wide field">
            <label><translate>Import reference</translate></label>
            <p><translate>This reference will be used to group imported files together.</translate></p>
            <input name="import-ref" type="text" v-model="importReference" />
          </div>
        </div>

      </div>
      <div class="ui green button" @click="currentTab = 'uploads'"><translate>Proceed</translate></div>
    </div>
    <div :class="['ui', 'bottom', 'attached', 'segment', {hidden: currentTab != 'uploads'}]">
      <div class="ui container">
        <file-upload-widget
          :class="['ui', 'icon', 'basic', 'button']"
          :post-action="uploadUrl"
          :multiple="true"
          :data="uploadData"
          :drop="true"
          :extensions="supportedExtensions"
          v-model="files"
          name="audio_file"
          :thread="1"
          @input-file="inputFile"
          ref="upload">
          <i class="upload icon"></i>&nbsp;
          <translate>Click to select files to upload or drag and drop files or directories</translate>
          <br />
          <br />
          <i><translate :translate-params="{extensions: supportedExtensions.join(', ')}">  Supported extensions: %{ extensions }</translate></i>
        </file-upload-widget>
      </div>
      <table v-if="files.length > 0" class="ui single line table">
        <thead>
          <tr>
            <th><translate>Filename</translate></th>
            <th><translate>Size</translate></th>
            <th><translate>Status</translate></th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(file, index) in sortedFiles" :key="file.id">
            <td :title="file.name">{{ file.name | truncate(60) }}</td>
            <td>{{ file.size | humanSize }}</td>
            <td>
              <span v-if="file.error" class="ui tooltip" :data-tooltip="labels.tooltips[file.error]">
                <span class="ui red icon label">
                  <i class="question circle outline icon" /> {{ file.error }}
                </span>
              </span>
              <span v-else-if="file.success" class="ui green label">
                <translate key="1">Uploaded</translate>
              </span>
              <span v-else-if="file.active" class="ui yellow label">
                <translate key="2">Uploading…</translate>
                ({{ parseInt(file.progress) }}%)
              </span>
              <template v-else>
                <span class="ui label"><translate key="3">Pending</translate></span>
                <button class="ui tiny basic red icon button" @click.prevent="$refs.upload.remove(file)"><i class="delete icon"></i></button>
              </template>
            </td>
          </tr>
        </tbody>
      </table>

    </div>
    <div :class="['ui', 'bottom', 'attached', 'segment', {hidden: currentTab != 'processing'}]">
      <library-files-table
        :needs-refresh="needsRefresh"
        @fetch-start="needsRefresh = false"
        :filters="{import_reference: importReference}"
        :custom-objects="Object.values(uploads.objects)"></library-files-table>
    </div>
  </div>
</template>

<script>
import _ from "@/lodash"
import $ from "jquery";
import axios from "axios";
import logger from "@/logging";
import FileUploadWidget from "./FileUploadWidget";
import LibraryFilesTable from "@/views/content/libraries/FilesTable";
import moment from "moment";

export default {
  props: ["library", "defaultImportReference"],
  components: {
    FileUploadWidget,
    LibraryFilesTable
  },
  data() {
    let importReference = this.defaultImportReference || moment().format();
    this.$router.replace({ query: { import: importReference } });
    return {
      files: [],
      needsRefresh: false,
      currentTab: "summary",
      uploadUrl: this.$store.getters['instance/absoluteUrl']("/api/v1/uploads/"),
      importReference,
      supportedExtensions: ["flac", "ogg", "mp3", "opus"],
      uploads: {
        pending: 0,
        finished: 0,
        skipped: 0,
        errored: 0,
        objects: {}
      },
      processTimestamp: new Date()
    };
  },
  created() {
    this.fetchStatus();
    this.$store.commit("ui/addWebsocketEventHandler", {
      eventName: "import.status_updated",
      id: "fileUpload",
      handler: this.handleImportEvent
    });
  },
  destroyed() {
    this.$store.commit("ui/removeWebsocketEventHandler", {
      eventName: "import.status_updated",
      id: "fileUpload"
    });
  },
  methods: {
    inputFile(newFile, oldFile) {
      this.$refs.upload.active = true;
    },
    fetchStatus() {
      let self = this;
      let statuses = ["pending", "errored", "skipped", "finished"];
      statuses.forEach(status => {
        axios
          .get("uploads/", {
            params: {
              import_reference: self.importReference,
              import_status: status,
              page_size: 1
            }
          })
          .then(response => {
            self.uploads[status] = response.data.count;
          });
      });
    },
    updateProgressBar() {
      $(this.$el)
        .find(".progress")
        .progress({
          total: this.uploads.length * 2,
          value: this.uploadedFilesCount + this.finishedJobs
        });
    },
    handleImportEvent(event) {
      let self = this;
      if (event.upload.import_reference != self.importReference) {
        return;
      }
      this.$nextTick(() => {
        self.uploads[event.old_status] -= 1;
        self.uploads[event.new_status] += 1;
        self.uploads.objects[event.upload.uuid] = event.upload;
        self.needsRefresh = true
      });
    }
  },
  computed: {
    labels() {
      let denied = this.$gettext(
        "Upload denied, ensure the file is not too big and that you have not reached your quota"
      );
      let server = this.$gettext(
        "Cannot upload this file, ensure it is not too big"
      );
      let network = this.$gettext(
        "A network error occured while uploading this file"
      );
      let timeout = this.$gettext("Upload timeout, please try again");
      let extension = this.$gettext(
        "Invalid file type, ensure you are uploading an audio file. Supported file extensions are %{ extensions }"
      );
      return {
        tooltips: {
          denied,
          server,
          network,
          timeout,
          extension: this.$gettextInterpolate(extension, {
            extensions: this.supportedExtensions.join(", ")
          })
        }
      };
    },
    uploadedFilesCount() {
      return this.files.filter(f => {
        return f.success;
      }).length;
    },
    uploadingFilesCount() {
      return this.files.filter(f => {
        return !f.success && !f.error;
      }).length;
    },
    erroredFilesCount() {
      return this.files.filter(f => {
        return f.error;
      }).length;
    },
    processableFiles() {
      return (
        this.uploads.pending +
        this.uploads.skipped +
        this.uploads.errored +
        this.uploads.finished +
        this.uploadedFilesCount
      );
    },
    processedFilesCount() {
      return (
        this.uploads.skipped + this.uploads.errored + this.uploads.finished
      );
    },
    uploadData: function() {
      return {
        library: this.library.uuid,
        import_reference: this.importReference
      };
    },
    sortedFiles() {
      // return errored files on top
      return this.files.sort(f => {
        if (f.errored) {
          return -5;
        }
        if (f.success) {
          return 5;
        }
        return 0;
      });
    }
  },
  watch: {
    uploadedFilesCount() {
      this.updateProgressBar();
    },
    finishedJobs() {
      this.updateProgressBar();
    },
    importReference: _.debounce(function() {
      this.$router.replace({ query: { import: this.importReference } });
    }, 500)
  }
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.file-uploads.ui.button {
  display: block;
  padding: 2em 1em;
  width: 100%;
  box-shadow: none;
  border-style: dashed !important;
  border: 3px solid rgba(50, 50, 50, 0.5);
  font-size: 1.5em;
}
</style>
