<script>
  import commonMixin from 'vue-baidu-map/components/base/mixins/common.js'
  import bindEvents from 'vue-baidu-map/components/base/bindEvent.js'
  import { createPoint, createSize } from 'vue-baidu-map/components/base/factory.js'

  export default {
    name: 'baidu-label',
    render () {},
    mixins: [commonMixin('overlay')],
    props: {
      content: {
        type: String
      },
      title: {
        type: String
      },
      offset: {},
      position: {},
      labelStyle: {},
      zIndex: {
        type: Number,
        default: 0
      },
      massClear: {
        type: Boolean,
        default: true
      }
    },
    watch: {
      content (val) {
        this.originInstance.setContent(val)
      },
      title (val) {
        this.originInstance.setTitle(val)
      },
      'offset.width' (val, oldVal) {
        const {BMap} = this
        if (val.toString() !== oldVal.toString()) {
          this.originInstance.setOffset(createSize(BMap, {width: val, height: this.offset.height}))
        }
      },
      'offset.height' (val, oldVal) {
        const {BMap} = this
        if (val.toString() !== oldVal.toString()) {
          this.originInstance.setOffset(createSize(BMap, {
            width: this.offset.width,
            height: val
          }))
        }
      },
      'position.lng' (val, oldVal) {
        const {BMap} = this
        const lng = val
        if (val.toString() !== oldVal.toString() && lng >= -180 && lng <= 180) {
          this.originInstance.setCenter(createPoint(BMap, {lng, lat: this.center.lat}))
        }
      },
      'position.lat' (val, oldVal) {
        const {BMap} = this
        const lat = val
        if (val.toString() !== oldVal.toString() && lat >= -74 && lat <= 74) {
          this.originInstance.setCenter(createPoint(BMap, {lng: this.center.lng, lat}))
        }
      },
      labelStyle: {
        handler (val) {
          this.originInstance.setStyle(val)
        },
        deep: true
      },
      zIndex (val) {
        this.originInstance.setZIndex(val)
      },
      massClear (val) {
        val ? this.originInstance.enableMassClear() : this.originInstance.disableMassClear()
      }
    },
    methods: {
      load () {
        const {BMap, map, content, title, offset, position, labelStyle, zIndex, massClear, $parent} = this
        const overlay = new BMap.Label(content, {
          offset: createSize(BMap, offset),
          position: createPoint(BMap, position),
          enableMassClear: massClear
        })
        this.originInstance = overlay
        try {
          $parent.originInstance.setLabel(overlay)
        } catch (e) {
          map.addOverlay(overlay)
        }
        title && overlay.setTitle(title)
        labelStyle && overlay.setStyle(labelStyle)
        zIndex && overlay.setZIndex(zIndex)
        bindEvents.call(this, overlay)
      }
    }
  }
</script>