#!/usr/bin/python

# genwater.py - create appropriate AREA_FEATURE_LIST STG files for ws30 from openstreetmap
# Copyright (C) 2021  Stuart Buchanan
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

# You will need Python Overpass API - "pip install overpy"

import xml.etree.ElementTree as etree
import os
import shutil
import re
import sys
import collections
from math import floor

import calc_tile
import overpy

nodes = {}
road_count = 0
river_count = 0

if (len(sys.argv) != 6):
    print("Simple generation of AREA_FEATURE_LIST files")
    print("")
    print("Usage: " + sys.argv[0] + " <scenery_dir> <lon1> <lat1> <lon2> <lat2>")
    print("  <scenery_dir>  \tScenery directory to write to")
    print("  <lon1> <lat1>  \tBottom left lon/lat of bounding box")
    print("  <lon2> <lat2>  \tTop right lon/lat of bounding box")
    exit(1)

scenery_prefix = sys.argv[1]
lon1 = sys.argv[2]
lat1 = sys.argv[3]
lon2 = sys.argv[4]
lat2 = sys.argv[5]

os.makedirs(scenery_prefix, exist_ok=True)

def feature_file(lat, lon, type):
    index = calc_tile.calc_tile_index((lon,lat))
    return str(index) + "_area_" + type + ".txt"

def add_to_stg(lat, lon, type):
    index = calc_tile.calc_tile_index((lon, lat))
    stg = os.path.join(scenery_prefix, calc_tile.directory_name((lon, lat)), str(index) + ".stg")
    #print("Writing " + stg)
    with open(stg, 'a') as f:
        f.write("AREA_FEATURE_LIST " + feature_file(lat, lon, type) + " " + type + "\n")

def write_feature(lon, lat, pts, type):
    index = calc_tile.calc_tile_index((lon,lat))
    dirname = os.path.join(scenery_prefix, calc_tile.directory_name((lon, lat)))
    os.makedirs(dirname, exist_ok=True)
    txt = os.path.join(scenery_prefix, calc_tile.directory_name((lon, lat)), feature_file(lat, lon, type))
    #print("Writing " + txt)
    with open(txt, 'a') as f:
        f.write("10000000 0 1 1 1 1") # Currently unused generic attributes. Also set area to 2000m^2
        for pt in pts :
            f.write(" " + str(pt.lon) + " " + str(pt.lat))
        f.write("\n")

    stg = os.path.join(scenery_prefix, calc_tile.directory_name((lon, lat)), str(index) + ".stg")
    if not os.path.isfile(stg) :
        # No STG - generate
        add_to_stg(lat, lon, type)
    else :
        pts_exists = 0
        with open(stg, 'r') as f:
            for line in f:
                if line.startswith("AREA_FEATURE_LIST " + feature_file(lat, lon, type)) :
                    pts_exists = 1
        if pts_exists == 0 :
            add_to_stg(lat, lon, type)


def parse_way(way) :
    global road_count, river_count, lat1, lon1, lat2, lon2
    pts = []    

    #feature_type = way.tags.get("water")
    feature_type = "Lake"
    # Add it to appropriate tile entries.
    tileids = set()

    for pt in way.nodes:
        lon = float(pt.lon)
        lat = float(pt.lat)
        idx = calc_tile.calc_tile_index([lon, lat])
        if ((float(lon1) <= lon <= float(lon2)) and (float(lat1) <= lat <= float(lat2)) and (idx not in tileids)) :
            # Write the feature to a bucket provided it's within the lat/lon bounds and if we've not already written it there
            write_feature(lon, lat, way.nodes, feature_type)
            tileids.add(idx)

def parse_multi(relation):
    for way in relation.members:
        if (way.tags.get("role") == "outer") :
            parse_way(way)

def writeOSM(result):
        #for child in result.relations:
            #parse_multi(child)

        for child in result.ways:
            parse_way(child)

# Get Lake data

osm_bbox = ",".join([lat1, lon1, lat2, lon2])
api = overpy.Overpass(url="https://lz4.overpass-api.de/api/interpreter")

query = "("

water_types = ["lake", "basin", "oxbow", "lagoon", "reservoir"]
for r in water_types :
    query = query + "way[\"water\"=\"" + r + "\"](" + osm_bbox + ");"
    query = query + "way[\"landuse\"=\"" + r + "\"](" + osm_bbox + ");"
    query = query + "way[\"natural\"=\"water\"](" + osm_bbox + ");"

for r in water_types :
    query = query + "relation[\"water\"=\"" + r + "\"][\"type\"=\"multipolygon\"](" + osm_bbox + ");"

query = query + ");(._;>;);out;"
result = api.query(query)
writeOSM(result)