{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "import pandas as pd\n",
    "import geopandas as gpd\n",
    "from shapely import wkt\n",
    "\n",
    "from google.cloud import bigquery\n",
    "from google.oauth2 import service_account\n",
    "\n",
    "from lets_plot import *"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "credentials = service_account.Credentials.from_service_account_file(\n",
    "    'bigquery_account_credentials.json',\n",
    "    scopes=['https://www.googleapis.com/auth/cloud-platform'],\n",
    ")\n",
    "client = bigquery.Client(credentials=credentials, project=credentials.project_id)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "def load_gdf(geometry, query):\n",
    "    df = client.query(query).result().to_dataframe()\n",
    "    df[geometry] = df[geometry].apply(wkt.loads)\n",
    "    return gpd.GeoDataFrame(df, geometry=geometry)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "boroughs_gdf = load_gdf('borough_geom', '''\n",
    "    SELECT borough_name, borough_geom\n",
    "    FROM `bigquery-public-data.new_york_subway.geo_nyc_borough_boundaries`\n",
    "''')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "stations_gdf = load_gdf('station_geom', '''\n",
    "    SELECT station_name, line, station_geom\n",
    "    FROM `bigquery-public-data.new_york_subway.stations`\n",
    "''')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "lines_gdf = load_gdf('line_geom', '''\n",
    "    SELECT ny_s.line, ST_MakeLine(ARRAY(\n",
    "        SELECT station_geom\n",
    "        FROM `bigquery-public-data.new_york_subway.stations`\n",
    "        WHERE line = ny_s.line\n",
    "        )) AS line_geom\n",
    "    FROM(\n",
    "        SELECT line \n",
    "        FROM `bigquery-public-data.new_york_subway.stations`\n",
    "        ) AS ny_s\n",
    "    GROUP BY line\n",
    "''')"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "ggplot() + \\\n",
    "    geom_polygon(aes(fill='borough_name'), data=boroughs_gdf, color='black', alpha=.15) + \\\n",
    "    scale_fill_discrete(name='') + \\\n",
    "    geom_path(aes(color='line'), data=lines_gdf, size=2) + \\\n",
    "    scale_color_discrete(name='Line') + \\\n",
    "    geom_point(aes(fill='station_name'), data=stations_gdf, shape=1, size=1.5) + \\\n",
    "    theme(axis_title='blank', axis_text='blank', axis_ticks='blank', axis_line='blank') + \\\n",
    "    ggsize(1000, 800)"
   ]
  }
 ],
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