<template>
  <div>
    <div class="ui vertical stripe segment">
      <div class="ui top three attached ordered steps">
        <a @click="currentStep = 0" :class="['step', {'active': currentStep === 0}, {'completed': currentStep > 0}]">
          <div class="content">
            <div class="title">Import source</div>
            <div class="description">
              Uploaded files or external source
            </div>
          </div>
        </a>
        <a @click="currentStep = 1" :class="['step', {'active': currentStep === 1}, {'completed': currentStep > 1}]">
          <div class="content">
            <div class="title">Metadata</div>
            <div class="description">Grab corresponding metadata</div>
          </div>
        </a>
        <a @click="currentStep = 2" :class="['step', {'active': currentStep === 2}, {'completed': currentStep > 2}]">
          <div class="content">
            <div class="title">Music</div>
            <div class="description">Select relevant sources or files for import</div>
          </div>
        </a>
      </div>
      <div class="ui attached segment">
        <template v-if="currentStep === 0">
          <p>First, choose where you want to import the music from :</p>
          <form class="ui form">
            <div class="field">
              <div class="ui radio checkbox">
                <input type="radio" id="external" value="external" v-model="currentSource">
                <label for="external">External source. Supported backends:
                  <div v-for="backend in backends" class="ui basic label">
                    <i v-if="backend.icon" :class="[backend.icon, 'icon']"></i>
                    {{ backend.label }}
                  </div>
                </label>
              </div>
            </div>
            <div class="field">
              <div class="ui disabled radio checkbox">
                <input type="radio" id="upload" value="upload" v-model="currentSource" disabled>
                <label for="upload">File upload</label>
              </div>
            </div>
          </form>
        </template>
        <div v-if="currentStep === 1" class="ui stackable two column grid">
          <div class="column">
            <form class="ui form" @submit.prevent="">
              <div class="field">
                <label>Search an entity you want to import:</label>
                <metadata-search
                  :mb-type="mbType"
                  :mb-id="mbId"
                  @id-changed="updateId"
                  @type-changed="updateType"></metadata-search>
              </div>
            </form>
              <div class="ui horizontal divider">
               Or
             </div>
            <form class="ui form" @submit.prevent="">
              <div class="field">
                <label>Input a MusicBrainz ID manually:</label>
                <input type="text" v-model="currentId" />
              </div>
            </form>
            <div class="ui hidden divider"></div>
            <template v-if="currentType && currentId">
              <h4 class="ui header">You will import:</h4>
              <component
                :mbId="currentId"
                :is="metadataComponent"
                @metadata-changed="this.updateMetadata"
                ></component>
            </template>
            <p>You can also skip this step and enter metadata manually.</p>
          </div>
          <div class="column">
            <h5 class="ui header">What is metadata?</h5>
            <p>Metadata is the data related to the music you want to import. This includes all the information about the artists, albums and tracks. In order to have a high quality library, it is recommended to grab data from the <a href="http://musicbrainz.org/" target="_blank">MusicBrainz project</a>, which you can think about as the Wikipedia of music.</p>
          </div>
        </div>
        <div v-if="currentStep === 2">
          <component
            ref="import"
            :metadata="metadata"
            :is="importComponent"
            :backends="backends"
            :default-backend-id="backends[0].id"
            @import-data-changed="updateImportData"
            @import-state-changed="updateImportState"
            ></component>
        </div>
        <div class="ui hidden divider"></div>
        <div class="ui buttons">
          <button @click="currentStep -= 1" :disabled="currentStep === 0" class="ui icon button"><i class="left arrow icon"></i> Previous step</button>
          <button @click="currentStep += 1" v-if="currentStep < 2" class="ui icon button">Next step <i class="right arrow icon"></i></button>
          <button
            @click="$refs.import.launchImport()"
            v-if="currentStep === 2"
            :class="['ui', 'positive', 'icon', {'loading': isImporting}, 'button']"
            :disabled="isImporting || importData.count === 0"
            >Import {{ importData.count }} tracks <i class="check icon"></i></button>
        </div>
      </div>
    </div>
    <div class="ui vertical stripe segment">

    </div>
  </div>
</template>

<script>

import MetadataSearch from '@/components/metadata/Search'
import ReleaseCard from '@/components/metadata/ReleaseCard'
import ArtistCard from '@/components/metadata/ArtistCard'
import ReleaseImport from './ReleaseImport'
import ArtistImport from './ArtistImport'

import router from '@/router'
import $ from 'jquery'

export default {
  components: {
    MetadataSearch,
    ArtistCard,
    ReleaseCard,
    ArtistImport,
    ReleaseImport
  },
  props: {
    mbType: {type: String, required: false},
    source: {type: String, required: false},
    mbId: {type: String, required: false}
  },
  data: function () {
    return {
      currentType: this.mbType || 'artist',
      currentId: this.mbId,
      currentStep: 0,
      currentSource: this.source || 'external',
      metadata: {},
      isImporting: false,
      importData: {
        tracks: []
      },
      backends: [
        {
          id: 'youtube',
          label: 'YouTube',
          icon: 'youtube'
        }
      ]
    }
  },
  created () {
    if (this.currentSource) {
      this.currentStep = 1
    }
  },
  mounted: function () {
    $(this.$el).find('.ui.checkbox').checkbox()
  },
  methods: {
    updateRoute () {
      router.replace({
        query: {
          source: this.currentSource,
          type: this.currentType,
          id: this.currentId
        }
      })
    },
    updateImportData (newValue) {
      this.importData = newValue
    },
    updateImportState (newValue) {
      this.isImporting = newValue
    },
    updateMetadata (newValue) {
      this.metadata = newValue
    },
    updateType (newValue) {
      this.currentType = newValue
    },
    updateId (newValue) {
      this.currentId = newValue
    }
  },
  computed: {
    metadataComponent () {
      if (this.currentType === 'artist') {
        return 'ArtistCard'
      }
      if (this.currentType === 'release') {
        return 'ReleaseCard'
      }
      if (this.currentType === 'recording') {
        return 'RecordingCard'
      }
    },
    importComponent () {
      if (this.currentType === 'artist') {
        return 'ArtistImport'
      }
      if (this.currentType === 'release') {
        return 'ReleaseImport'
      }
      if (this.currentType === 'recording') {
        return 'RecordingImport'
      }
    }
  },
  watch: {
    currentType (newValue) {
      this.currentId = ''
      this.updateRoute()
    },
    currentId (newValue) {
      this.updateRoute()
    }
  }
}
</script>
<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
</style>
