#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import subprocess, sys, os, pprint, datetime, argparse, time

base_path = os.path.dirname(os.path.realpath(__file__))

FNULL = open(os.devnull, 'w')

wget_cmd = '/usr/bin/wget'
bunzip2_cmd = '/usr/bin/bunzip2'

if __name__ == '__main__':
	current_timestamp = datetime.datetime.now().strftime('%Y%m%d-%H%M')
	
	parser = argparse.ArgumentParser()
	parser.add_argument('--map-list', action='append')
	#TODO: Add argument to pass path to osmosis
	#TODO: Add argument to pass path to output dir
	args = parser.parse_args()

	map_list = []
	for alist in args.map_list:
		with open(alist, 'r') as maps:
			for line in maps:
				map_list.append(line.strip())

	print('Creating working directories')
	if not os.path.exists('out'):
		os.makedirs('out')
	os.chdir('out')
	if not os.path.exists(current_timestamp):
		os.makedirs(current_timestamp)
	os.chdir(current_timestamp)
	if not os.path.exists('dl'):
		os.makedirs('dl')

	print('Downloading maps')
	for line in map_list:
		print('    ', end='')
		print(line)
		subprocess.run([wget_cmd, '-P', 'dl', line.strip()], stdout=FNULL, stderr=subprocess.STDOUT)
		print('    Sleeping 1m to prevent throttle/blocking')
		time.sleep(300) # Seconds

	print('Decompressing maps (if necessary)')
	for dirpath, dirnames, filenames in os.walk('dl'):
		for file in filenames:
			if file.endswith('bz2'):
				print('    ', end='')
				print(file)
				subprocess.run([bunzip2_cmd, os.path.join(dirpath, file)])
				
	print('Processing maps using osmosis')
	files_to_process = []
	for dirpath, dirnames, filenames in os.walk('dl'):
		for file in filenames:
			print('    Found map: ', end='')
			print(os.path.join(dirpath, file))
			files_to_process.append(os.path.join(dirpath, file))
	osmosis_cmd = [os.path.join(base_path, 'bin', 'osmosis', 'bin', 'osmosis')]
	for file in files_to_process:
		if file.endswith('osm'):
			osmosis_cmd.extend(['--rx', 'file=' + file])
		elif file.endswith('pbf'):
			osmosis_cmd.extend(['--rb', 'file=' + file])
	for x in range(0, len(files_to_process) - 1):
		osmosis_cmd.append('--merge')
	osmosis_cmd.extend(['--mapfile-writer', 'file=output.map'])
	subprocess.run(osmosis_cmd)