<template>
  <section class="ui inverted segment player-wrapper" :aria-label="labels.audioPlayer" :style="style">
    <div class="player">
      <audio-track
        ref="currentAudio"
        v-if="currentTrack"
        @errored="handleError"
        :is-current="true"
        :start-time="$store.state.player.currentTime"
        :autoplay="$store.state.player.playing"
        :key="audioKey"
        :track="currentTrack">
      </audio-track>
      <div v-if="currentTrack" class="track-area ui unstackable items">
        <div class="ui inverted item">
          <div class="ui tiny image">
            <img ref="cover" @load="updateBackground" v-if="currentTrack.album.cover && currentTrack.album.cover.original" :src="$store.getters['instance/absoluteUrl'](currentTrack.album.cover.medium_square_crop)">
            <img v-else src="../../assets/audio/default-cover.png">
          </div>
          <div class="middle aligned content">
            <router-link class="small header discrete link track" :to="{name: 'library.tracks.detail', params: {id: currentTrack.id }}">
              {{ currentTrack.title }}
            </router-link>
            <div class="meta">
              <router-link class="artist" :to="{name: 'library.artists.detail', params: {id: currentTrack.artist.id }}">
                {{ currentTrack.artist.name }}
              </router-link> /
              <router-link class="album" :to="{name: 'library.albums.detail', params: {id: currentTrack.album.id }}">
                {{ currentTrack.album.title }}
              </router-link>
            </div>
            <div class="description">
              <track-favorite-icon
                v-if="$store.state.auth.authenticated"
                :class="{'inverted': !$store.getters['favorites/isFavorite'](currentTrack.id)}"
                :track="currentTrack"></track-favorite-icon>
              <track-playlist-icon
                v-if="$store.state.auth.authenticated"
                :class="['inverted']"
                :track="currentTrack"></track-playlist-icon>
            </div>
          </div>
        </div>
      </div>
      <div class="progress-area" v-if="currentTrack && !errored">
        <div class="ui grid">
          <div class="left floated four wide column">
            <p class="timer start" @click="updateProgress(0)">{{currentTimeFormatted}}</p>
          </div>

          <div v-if="!isLoadingAudio" class="right floated four wide column">
            <p class="timer total">{{durationFormatted}}</p>
          </div>
        </div>
        <div
          ref="progress"
          :class="['ui', 'small', 'orange', 'inverted', {'indicating': isLoadingAudio}, 'progress']"
          @click="touchProgress">
          <div class="buffer bar" :data-percent="bufferProgress" :style="{ 'width': bufferProgress + '%' }"></div>
          <div class="bar" :data-percent="progress" :style="{ 'width': progress + '%' }"></div>
        </div>
      </div>
      <div class="ui small warning message" v-if="currentTrack && errored">
        <div class="header">
          <translate>We cannot load this track</translate>
        </div>
        <p v-if="hasNext && playing && $store.state.player.errorCount < $store.state.player.maxConsecutiveErrors">
          <translate>The next track will play automatically in a few seconds...</translate>
          <i class="loading spinner icon"></i>
        </p>
        <p>
          <translate>You may have a connectivity issue.</translate>
        </p>
      </div>
      <div class="two wide column controls ui grid">
        <a
          href
          :title="labels.previousTrack"
          :aria-label="labels.previousTrack"
          class="two wide column control"
          @click.prevent.stop="previous"
          :disabled="emptyQueue">
            <i :class="['ui', 'backward step', {'disabled': emptyQueue}, 'secondary', 'icon']"></i>
        </a>
        <a
          href
          v-if="!playing"
          :title="labels.play"
          :aria-label="labels.play"
          @click.prevent.stop="togglePlay"
          class="two wide column control">
            <i :class="['ui', 'play', {'disabled': !currentTrack}, 'secondary', 'icon']"></i>
        </a>
        <a
          href
          v-else
          :title="labels.pause"
          :aria-label="labels.pause"
          @click.prevent.stop="togglePlay"
          class="two wide column control">
            <i :class="['ui', 'pause', {'disabled': !currentTrack}, 'secondary', 'icon']"></i>
        </a>
        <a
          href
          :title="labels.next"
          :aria-label="labels.next"
          class="two wide column control"
          @click.prevent.stop="next"
          :disabled="!hasNext">
            <i :class="['ui', {'disabled': !hasNext}, 'forward step', 'secondary', 'icon']" ></i>
        </a>
        <div
          class="wide column control volume-control"
          v-on:mouseover="showVolume = true"
          v-on:mouseleave="showVolume = false"
          v-bind:class="{ active : showVolume }">
          <a
            href
            v-if="volume === 0"
            :title="labels.unmute"
            :aria-label="labels.unmute"
            @click.prevent.stop="unmute">
            <i class="volume off secondary icon"></i>
          </a>
          <a
            href
            v-else-if="volume < 0.5"
            :title="labels.mute"
            :aria-label="labels.mute"
            @click.prevent.stop="mute">
            <i class="volume down secondary icon"></i>
          </a>
          <a
            href
            v-else
            :title="labels.mute"
            :aria-label="labels.mute"
            @click.prevent.stop="mute">
            <i class="volume up secondary icon"></i>
          </a>
          <input
            type="range"
            step="0.05"
            min="0"
            max="1"
            v-model="sliderVolume"
            v-if="showVolume" />
        </div>
        <div class="two wide column control looping" v-if="!showVolume">
          <a
            href
            v-if="looping === 0"
            :title="labels.loopingDisabled"
            :aria-label="labels.loopingDisabled"
            @click.prevent.stop="$store.commit('player/looping', 1)"
            :disabled="!currentTrack">
            <i :class="['ui', {'disabled': !currentTrack}, 'step', 'repeat', 'secondary', 'icon']"></i>
          </a>
          <a
            href
            @click.prevent.stop="$store.commit('player/looping', 2)"
            :title="labels.loopingSingle"
            :aria-label="labels.loopingSingle"
            v-if="looping === 1"
            :disabled="!currentTrack">
            <i
              class="repeat secondary icon">
              <span class="ui circular tiny orange label">1</span>
            </i>
          </a>
          <a
            href
            :title="labels.loopingWhole"
            :aria-label="labels.loopingWhole"
            v-if="looping === 2"
            :disabled="!currentTrack"
            @click.prevent.stop="$store.commit('player/looping', 0)">
            <i
              class="repeat orange secondary icon">
            </i>
          </a>
        </div>
        <a
          href
          :disabled="queue.tracks.length === 0"
          :title="labels.shuffle"
          :aria-label="labels.shuffle"
          v-if="!showVolume"
          @click.prevent.stop="shuffle()"
          class="two wide column control">
          <div v-if="isShuffling" class="ui inline shuffling inverted tiny active loader"></div>
          <i v-else :class="['ui', 'random', 'secondary', {'disabled': queue.tracks.length === 0}, 'icon']" ></i>
        </a>
        <div class="one wide column" v-if="!showVolume"></div>
        <a
          href
          :disabled="queue.tracks.length === 0"
          :title="labels.clear"
          :aria-label="labels.clear"
          v-if="!showVolume"
          @click.prevent.stop="clean()"
          class="two wide column control">
          <i :class="['ui', 'trash', 'secondary', {'disabled': queue.tracks.length === 0}, 'icon']" ></i>
        </a>
      </div>
      <GlobalEvents
        @keydown.space.prevent.exact="togglePlay"
        @keydown.ctrl.left.prevent.exact="previous"
        @keydown.ctrl.right.prevent.exact="next"
        @keydown.ctrl.down.prevent.exact="$store.commit('player/incrementVolume', -0.1)"
        @keydown.ctrl.up.prevent.exact="$store.commit('player/incrementVolume', 0.1)"
        @keydown.l.prevent.exact="$store.commit('player/toggleLooping')"
        @keydown.s.prevent.exact="shuffle"
        />
    </div>
  </section>
</template>

<script>
import { mapState, mapGetters, mapActions } from "vuex"
import GlobalEvents from "@/components/utils/global-events"
import ColorThief from "@/vendor/color-thief"
import { Howl } from "howler"

import AudioTrack from "@/components/audio/Track"
import TrackFavoriteIcon from "@/components/favorites/TrackFavoriteIcon"
import TrackPlaylistIcon from "@/components/playlists/TrackPlaylistIcon"

export default {
  components: {
    TrackFavoriteIcon,
    TrackPlaylistIcon,
    GlobalEvents,
    AudioTrack
  },
  data() {
    let defaultAmbiantColors = [
      [46, 46, 46],
      [46, 46, 46],
      [46, 46, 46],
      [46, 46, 46]
    ]
    return {
      isShuffling: false,
      sliderVolume: this.volume,
      defaultAmbiantColors: defaultAmbiantColors,
      showVolume: false,
      ambiantColors: defaultAmbiantColors,
      audioKey: String(new Date()),
      dummyAudio: null
    }
  },
  mounted() {
    // we trigger the watcher explicitely it does not work otherwise
    this.sliderVolume = this.volume
    // this is needed to unlock audio playing under some browsers,
    // cf https://github.com/goldfire/howler.js#mobilechrome-playback
    // but we never actually load those audio files
    this.dummyAudio = new Howl({
      preload: false,
      autoplay: false,
      src: ["noop.webm", "noop.mp3"]
    })
  },
  destroyed() {
    this.dummyAudio.unload()
  },
  methods: {
    ...mapActions({
      togglePlay: "player/togglePlay",
      mute: "player/mute",
      unmute: "player/unmute",
      clean: "queue/clean",
      updateProgress: "player/updateProgress"
    }),
    shuffle() {
      let disabled = this.queue.tracks.length === 0
      if (this.isShuffling || disabled) {
        return
      }
      let self = this
      let msg = this.$gettext("Queue shuffled!")
      this.isShuffling = true
      setTimeout(() => {
        self.$store.dispatch("queue/shuffle", () => {
          self.isShuffling = false
          self.$store.commit("ui/addMessage", {
            content: msg,
            date: new Date()
          })
        })
      }, 100)
    },
    next() {
      let self = this
      this.$store.dispatch("queue/next").then(() => {
        self.$emit("next")
      })
    },
    previous() {
      let self = this
      this.$store.dispatch("queue/previous").then(() => {
        self.$emit("previous")
      })
    },
    touchProgress(e) {
      let time
      let target = this.$refs.progress
      time = (e.layerX / target.offsetWidth) * this.duration
      this.$refs.currentAudio.setCurrentTime(time)
    },
    updateBackground() {
      if (!this.currentTrack.album.cover) {
        this.ambiantColors = this.defaultAmbiantColors
        return
      }
      let image = this.$refs.cover
      this.ambiantColors = ColorThief.prototype.getPalette(image, 4).slice(0, 4)
    },
    handleError({ sound, error }) {
      this.$store.commit("player/isLoadingAudio", false)
      this.$store.dispatch("player/trackErrored")
    }
  },
  computed: {
    ...mapState({
      currentIndex: state => state.queue.currentIndex,
      playing: state => state.player.playing,
      isLoadingAudio: state => state.player.isLoadingAudio,
      volume: state => state.player.volume,
      looping: state => state.player.looping,
      duration: state => state.player.duration,
      bufferProgress: state => state.player.bufferProgress,
      errored: state => state.player.errored,
      queue: state => state.queue
    }),
    ...mapGetters({
      currentTrack: "queue/currentTrack",
      hasNext: "queue/hasNext",
      emptyQueue: "queue/isEmpty",
      durationFormatted: "player/durationFormatted",
      currentTimeFormatted: "player/currentTimeFormatted",
      progress: "player/progress"
    }),
    labels() {
      let audioPlayer = this.$gettext("Media player")
      let previousTrack = this.$gettext("Previous track")
      let play = this.$gettext("Play track")
      let pause = this.$gettext("Pause track")
      let next = this.$gettext("Next track")
      let unmute = this.$gettext("Unmute")
      let mute = this.$gettext("Mute")
      let loopingDisabled = this.$gettext(
        "Looping disabled. Click to switch to single-track looping."
      )
      let loopingSingle = this.$gettext(
        "Looping on a single track. Click to switch to whole queue looping."
      )
      let loopingWhole = this.$gettext(
        "Looping on whole queue. Click to disable looping."
      )
      let shuffle = this.$gettext("Shuffle your queue")
      let clear = this.$gettext("Clear your queue")
      return {
        audioPlayer,
        previousTrack,
        play,
        pause,
        next,
        unmute,
        mute,
        loopingDisabled,
        loopingSingle,
        loopingWhole,
        shuffle,
        clear
      }
    },
    style: function() {
      let style = {
        background: this.ambiantGradiant
      }
      return style
    },
    ambiantGradiant: function() {
      let indexConf = [
        { orientation: 330, percent: 100, opacity: 0.7 },
        { orientation: 240, percent: 90, opacity: 0.7 },
        { orientation: 150, percent: 80, opacity: 0.7 },
        { orientation: 60, percent: 70, opacity: 0.7 }
      ]
      let gradients = this.ambiantColors
        .map((e, i) => {
          let [r, g, b] = e
          let conf = indexConf[i]
          return `linear-gradient(${
            conf.orientation
          }deg, rgba(${r}, ${g}, ${b}, ${
            conf.opacity
          }) 10%, rgba(255, 255, 255, 0) ${conf.percent}%)`
        })
        .join(", ")
      return gradients
    }
  },
  watch: {
    currentTrack(newValue, oldValue) {
      if (!this.isShuffling && newValue != oldValue) {
        this.audioKey = String(new Date())
      }
      if (!newValue || !newValue.album.cover) {
        this.ambiantColors = this.defaultAmbiantColors
      }
    },
    volume(newValue) {
      this.sliderVolume = newValue
    },
    sliderVolume(newValue) {
      this.$store.commit("player/volume", newValue)
    }
  }
}
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped lang="scss">
.ui.progress {
  margin: 0.5rem 0 1rem;
}
.progress {
  cursor: pointer;
  .bar {
    min-width: 0 !important;
  }
}

.ui.inverted.item > .content > .description {
  color: rgba(255, 255, 255, 0.9) !important;
}

.ui.item {
  .meta {
    font-size: 90%;
    line-height: 1.2;
  }
}
.timer.total {
  text-align: right;
}
.timer.start {
  cursor: pointer;
}
.track-area {
  margin-top: 0;
  .header,
  .meta,
  .artist,
  .album {
    color: white !important;
  }
}
.controls a {
  color: white;
}

.controls .icon.big {
  cursor: pointer;
  font-size: 2em !important;
}

.controls .icon {
  cursor: pointer;
  vertical-align: middle;
}

.secondary.icon {
  font-size: 1.5em;
}
.progress-area .actions {
  text-align: center;
}
.volume-control {
  position: relative;
  width: 12.5% !important;
  [type="range"] {
    max-width: 70%;
    position: absolute;
    bottom: 1.1rem;
    left: 25%;
    cursor: pointer;
  }
  input[type="range"]:focus {
    outline: none;
  }
  input[type="range"]::-webkit-slider-runnable-track {
    cursor: pointer;
  }
  input[type="range"]::-webkit-slider-thumb {
    background: white;
    cursor: pointer;
    -webkit-appearance: none;
    border-radius: 3px;
    width: 10px;
  }
  input[type="range"]::-moz-range-track {
    cursor: pointer;
    background: white;
    opacity: 0.3;
  }
  input[type="range"]::-moz-focus-outer {
    border: 0;
  }
  input[type="range"]::-moz-range-thumb {
    background: white;
    cursor: pointer;
    border-radius: 3px;
    width: 10px;
  }
  input[type="range"]::-ms-track {
    cursor: pointer;
    background: transparent;
    border-color: transparent;
    color: transparent;
  }
  input[type="range"]::-ms-fill-lower {
    background: white;
    opacity: 0.3;
  }
  input[type="range"]::-ms-fill-upper {
    background: white;
    opacity: 0.3;
  }
  input[type="range"]::-ms-thumb {
    background: white;
    cursor: pointer;
    border-radius: 3px;
    width: 10px;
  }
  input[type="range"]:focus::-ms-fill-lower {
    background: white;
  }
  input[type="range"]:focus::-ms-fill-upper {
    background: white;
  }
}

.active.volume-control {
  width: 60% !important;
}

.looping.control {
  i {
    position: relative;
  }
  .label {
    position: absolute;
    font-size: 0.7rem;
    bottom: -0.7rem;
    right: -0.7rem;
  }
}
.ui.feed.icon {
  margin: 0;
}
.shuffling.loader.inline {
  margin: 0;
}

@keyframes MOVE-BG {
  from {
    transform: translateX(0px);
  }
  to {
    transform: translateX(46px);
  }
}

.indicating.progress {
  overflow: hidden;
}

.ui.progress .bar {
  transition: none;
}

.ui.inverted.progress .buffer.bar {
  position: absolute;
  background-color: rgba(255, 255, 255, 0.15);
}
.indicating.progress .bar {
  left: -46px;
  width: 200% !important;
  color: grey;
  background: repeating-linear-gradient(
    -55deg,
    grey 1px,
    grey 10px,
    transparent 10px,
    transparent 20px
  ) !important;

  animation-name: MOVE-BG;
  animation-duration: 2s;
  animation-timing-function: linear;
  animation-iteration-count: infinite;
}
</style>