#!/usr/bin/env python3
"""
An IRC bot which tracks new alerts and invasions for Warframe and reports
them to channel. Only intended to be used in one channel at a time.
"""
import os
import json
import time
import functools
import threading
import configparser

import requests
from twisted.internet import protocol, reactor
from twisted.words.protocols import irc

URI = "http://content.warframe.com/dynamic/worldState.php"


class ClockThread(threading.Thread):
	"""
	A thread class which acts like a clock for signaling the bot to check
	the world state every minute.
	"""
	def __init__(self, bot):
		threading.Thread.__init__(self)
		self.bot = bot

	
	def run(self):
		while not stop.is_set():
			self.bot.checkNewAlerts()
			stop.wait(60)


class WarBot(irc.IRCClient):
	def __init__(self, config):
		self.config = config
		self.nickname = self.config["nickname"]
		self.username = self.config["ident"]
		self.channel = self.config["channel"]

		with open(os.path.join("static", "languages.json"), "r") as file:
			self.languages = json.loads(file.read())

		with open(os.path.join("static", "missionTypes.json"), "r") as file:
			self.missionTypes = json.loads(file.read())

		with open(os.path.join("static", "solNodes.json"), "r") as file:
			self.solNodes = json.loads(file.read())

		self.clockThread = ClockThread(self)
		self.clockThread.start()

		self.alert_ids = []


	def stillConnected(self):
		"""Returns true if the bot is still connected to the server."""
		if self._heartbeat:
			return True
		else:
			return False


	def clock(self):
		"""
		A continous loop which calls the processing functions once per
		minute. Should only be ran in a separate thread.
		"""
		while not stop.is_set():
			self.checkNewAlerts()
			stop.wait(60)


	def checkNewAlerts(self):
		"""
		Checks the world state for new alerts or invasions.
		"""
		while not self.stillConnected(): # startup reasons
			time.sleep(1)

		try:
			res = requests.get(URI)
			res.raise_for_status()
		except requests.exceptions.ConnectionError:
			return
		data = res.json()

		alert_ids = [alert["_id"]["$oid"] for alert in data["Alerts"]]

		new_alerts = [a for a in alert_ids if a not in self.alert_ids]
		self.alert_ids += new_alerts
		for alert in data["Alerts"]:
			if alert["_id"]["$oid"] in new_alerts:
				self.process_alert(alert)

		expired_alerts = [a for a in self.alert_ids if a not in alert_ids]
		for alert_id in expired_alerts:
			self.alert_ids.remove(alert_id)

	
	def process_alert(self, alert):
		"""
		Processes the provided alert and sends a message to channel.
		"""
		info = alert["MissionInfo"]
		node = self.solNodes[info["location"]]
		mission_type = self.missionTypes[info["missionType"]]["value"]
		credits = info["missionReward"].get("credits")
		items = info["missionReward"].get("items", [])
		if items:
			items = [self.languages[item.lower()]["value"] for item in items]
		cItems = info["missionReward"].get("countedItems")
		if cItems:
			for item in cItems:
				itemStr = f"({item['ItemCount']}) "
				itemStr += self.languages[item["ItemType"].lower()]["value"]
				items.append(itemStr)

		expire = int(alert["Expiry"]["$date"]["$numberLong"])
		expire_diff = int(expire/1000 - time.time())
		expire_t = time.localtime(expire)

		message = "\x0300[\x0305ALERT\x0300] " \
				+ f"\x0310Location\x03: \x0312{node['value']}\x03 | " \
				+ f"\x0310Mission Type\x03: \x0312{mission_type}\x03 | " \
				+ f"\x0310Expiry\x03: \x0308{expire_diff // 3600}h" \
				+ f"{expire_diff % 3600 // 60}m\x03 " \
				+ f"(\x0308{time.strftime('%H:%M', expire_t)}\x03)" \
				+ f" | \x0310Credits\x03: \x0312{credits}\x03"
		if items:
			message += f" | \x0310Items: \x0312{', '.join(items)}\x03"

		self.msg(self.channel, message)


	def privmsg(self, user, channel, message):
		"""
		Called when the bot receives a PRIVMSG, which can come from channels
		or users alike.
		"""
		pass


	def joined(self, channel):
		"""Called when the bot joins a new channel."""
		print("Joined", channel)


	def signedOn(self):
		"""Called when the bot successfully connects to the server."""
		print("Signed on as", self.nickname)
		self.mode(self.nickname, True, "B") # set +B on self
		self.join(self.channel)


	def nickChanged(self, nick):
		"""Called when my nick has been changed."""
		print("Nick changed to", nick)


class WarBotFactory(protocol.ReconnectingClientFactory):
	# black magic going on here
	protocol = property(lambda s: functools.partial(WarBot, s.config))

	def __init__(self, config):
		self.config = config


stop = threading.Event()
if __name__ == "__main__":
	import argparse

	parser = argparse.ArgumentParser(
		description="Downloads new torrents from a torrent tracker's IRC " \
			+ "announce channel.")
	parser.add_argument(
		"-c",
		"--config",
		default="config.cfg",
		help="Specify an alternate config file to use.")
	args = parser.parse_args()

	config = configparser.ConfigParser()
	config.read(args.config)
	config = config[config.sections()[0]] #only use the first section

	server = config["server"]
	port = config.getint("port")
	print("Connecting to:", server)
	reactor.connectTCP(server, port, WarBotFactory(config))
	reactor.addSystemEventTrigger('before','shutdown', stop.set)
	reactor.run()