#!/bin/python3

import gpxpy
import gpxpy.gpx
import shapely
import pickle

GPX_IN_FILE = 'caches.gpx'
GPX_OUT_FILE = 'koggenland.gpx'
PICKLE_FILE = 'polygon.pickle'


def main():
    with open(PICKLE_FILE, 'rb') as f:
        area = pickle.load(f)

    with open(GPX_IN_FILE, 'rb') as f:
        gpx = gpxpy.parse(f)

    gpx.waypoints = list(filter(lambda wp: area.contains(
        shapely.Point(wp.latitude, wp.longitude)), gpx.waypoints))

    with open(GPX_OUT_FILE, 'w') as f:
        f.write(gpx.to_xml())


if __name__ == '__main__':
    main()