#!/usr/bin/env python3
"""
The end user script for the modpack.
"""
import os
import json
import urllib.parse
import urllib.request

import config_slave

def sync(delete=False):
	"""
	Synchronize the local `mods/` folder with the remote server.
	"""
	remote_mods =urllib.request.urlopen(config_slave.remote_addr+'/get').read()
	remote_mods = json.loads(remote_mods)
	local_mods = os.listdir('mods')

	local_mods_del = [mod for mod in local_mods if mod not in remote_mods]
	remote_mods_get = [mod for mod in remote_mods if mod not in local_mods]

	for mod in local_mods_del:
		if delete:
			os.remove(os.path.join('mods', mod))
		else:
			os.makedirs('mods_old', exist_ok=True)
			os.rename(os.path.join('mods', mod), os.path.join('mods_old', mod))
		print(f"Deleted {mod}")
	
	for mod in remote_mods_get:
		url = config_slave.remote_addr + '/mods/' + urllib.parse.quote(mod)
		res = urllib.request.urlopen(url)
		data = res.read()
		with open(os.path.join('mods', mod), 'wb') as file:
			file.write(data)
		print(f"Downloaded {mod}")
	print("Success!")

if __name__ == "__main__":
	import argparse

	parser = argparse.ArgumentParser(
		description="Script for synchronizing the local mods/ folder "
			"with the remote server."
	)
	parser.add_argument(
		'action',
		choices=['sync'],
		default='sync',
		help="What action to perform."
	)
	parser.add_argument(
		'--delete',
		action='store_true',
		help="By default, old mods are moved to a mods_old/ folder "
			"instead of being deleted. Checking this flag will delete "
			"them instead."
	)
	args = parser.parse_args()

	if args.action == 'sync':
		sync(args.delete)