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   "source": [
    "import json\n",
    "import copy\n",
    "from ipyleaflet import Map, GeoJSON, Layer"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "m = Map(center=[53.88, 27.45], zoom=3, name=\"Base map\")\n",
    "m"
   ]
  },
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   "cell_type": "code",
   "execution_count": null,
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   "source": [
    "# geojson layer with hover handler\n",
    "with open(\"./europe_110.geo.json\", \"r\") as f:\n",
    "    data = json.load(f)\n",
    "\n",
    "for feature in data[\"features\"]:\n",
    "    feature[\"properties\"][\"style\"] = {\n",
    "        \"color\": \"grey\",\n",
    "        \"weight\": 1,\n",
    "        \"fillColor\": \"grey\",\n",
    "        \"fillOpacity\": 0.2,\n",
    "    }\n",
    "\n",
    "selected_set = set()\n",
    "selected_layer = None\n",
    "\n",
    "\n",
    "def convert_selected_set_to_geojson(selected_set):\n",
    "    geojson = {\"type\": \"FeatureCollection\", \"features\": []}\n",
    "    geojson[\"features\"] = [\n",
    "        feature\n",
    "        for feature in data[\"features\"]\n",
    "        if feature[\"properties\"][\"iso_a3\"] in selected_set\n",
    "    ]\n",
    "    for feature in data[\"features\"]:\n",
    "        feature[\"properties\"][\"style\"] = {\n",
    "            \"color\": \"yellow\",\n",
    "            \"weight\": 2,\n",
    "            \"fillColor\": \"grey\",\n",
    "            \"fillOpacity\": 0.2,\n",
    "        }\n",
    "    return geojson\n",
    "\n",
    "\n",
    "def selected_onclick_handler(event=None, id=None, properties=None, **args):\n",
    "    global selected_layer\n",
    "    if properties is None:\n",
    "        return\n",
    "    cid = properties[\"iso_a3\"]\n",
    "    selected_set.remove(cid)\n",
    "    if selected_layer is not None:\n",
    "        m.remove_layer(selected_layer)\n",
    "    selected_layer = GeoJSON(\n",
    "        data=convert_selected_set_to_geojson(selected_set),\n",
    "        name=\"Selected EU Countries\",\n",
    "        hover_style={\"fillColor\": \"yellow\"},\n",
    "    )\n",
    "    selected_layer.on_click(selected_onclick_handler)\n",
    "    m.add(selected_layer)\n",
    "\n",
    "\n",
    "def geojson_onclick_handler(event=None, id=None, properties=None, **args):\n",
    "    global selected_layer\n",
    "    if properties is None:\n",
    "        return\n",
    "    cid = properties[\"iso_a3\"]\n",
    "    selected_set.add(cid)\n",
    "    if selected_layer is not None:\n",
    "        m.remove_layer(selected_layer)\n",
    "    selected_layer = GeoJSON(\n",
    "        data=convert_selected_set_to_geojson(selected_set),\n",
    "        name=\"Selected EU Countries\",\n",
    "        hover_style={\"fillColor\": \"yellow\"},\n",
    "    )\n",
    "    selected_layer.on_click(selected_onclick_handler)\n",
    "    m.add(selected_layer)\n",
    "\n",
    "\n",
    "geojson_layer = GeoJSON(\n",
    "    data=data, name=\"EU Countries\", hover_style={\"fillColor\": \"red\"}\n",
    ")\n",
    "geojson_layer.on_click(geojson_onclick_handler)\n",
    "m.add(geojson_layer)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
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   "source": []
  }
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