<template>
  <div :class="['zoom-buttons shadow-xs', { splitscreen: showSplitscreen }]">
    <button
      class="zoom-button border-0 bg-white rounded-left ui-element"
      @click="zoomOut"
    >
      <font-awesome-icon icon="minus"></font-awesome-icon>
    </button>
    <button
      class="zoom-button border-0 bg-white ui-element border-right"
      @click="refreshMap"
    >
      <font-awesome-icon icon="redo"></font-awesome-icon>
    </button>
    <button
      class="zoom-button border-0 bg-white rounded-right ui-element border-right"
      @click="zoomIn"
    >
      <font-awesome-icon icon="plus"></font-awesome-icon>
    </button>
  </div>
</template>

<style lang="sass" scoped>
.zoom-buttons
  position: absolute
  bottom: $small-offset
  left: 50%
  margin-left: -($icon-width * 1.5)
  margin-bottom: 0
  transition: margin-bottom 0.3s
  &.splitscreen
    margin-bottom: 50vh

  .zoom-button
    min-height: $icon-width
    min-width: $icon-width
    z-index: 1
    outline: none
    color: #666
</style>

<script>
/* This is Free Software under GNU Affero General Public License v >= 3.0
 * without warranty, see README.md and license for details.
 *
 * SPDX-License-Identifier: AGPL-3.0-or-later
 * License-Filename: LICENSES/AGPL-3.0.txt
 *
 * Copyright (C) 2018 by via donau
 *   – Österreichische Wasserstraßen-Gesellschaft mbH
 * Software engineering by Intevation GmbH
 *
 * Author(s):
 * Markus Kottländer <markus@intevation.de>
 * Thomas Junk <thomas.junk@intevation.de>
 */
import { mapState } from "vuex";
import { Vector as VectorLayer } from "ol/layer.js";

export default {
  name: "zoom",
  computed: {
    ...mapState("map", ["openLayersMap"]),
    ...mapState("application", ["showSplitscreen"]),
    zoomLevel: {
      get() {
        return this.openLayersMap.getView().getZoom();
      },
      set(value) {
        this.openLayersMap.getView().animate({ zoom: value, duration: 300 });
      }
    }
  },
  methods: {
    zoomIn() {
      this.zoomLevel = this.zoomLevel + 1;
    },
    zoomOut() {
      this.zoomLevel = this.zoomLevel - 1;
    },
    refreshMap() {
      let layers = this.openLayersMap.getLayers().getArray();
      for (let i = 0; i < layers.length; i++) {
        let layer = layers[i];
        if (
          layer instanceof VectorLayer &&
          layer.get("source").loader_.name != "VOID"
        ) {
          layer.getSource().clear(true);
          layer.getSource().refresh({ force: true });
        }
      }
    }
  }
};
</script>