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#!/usr/bin/env python3
import pymongo
import discord
import asyncio
import threading
import logging

import parsedatetime
import datetime


TOKEN = "MjM5NzI3NzQ2Nzk0NzgyNzIw.Cu5BbA.z7bkO3Ncd_L80htVzREHYDsEGNk"
VERSION = "v0.1.0"

client = pymongo.MongoClient()
db = client.vainbot

cli = discord.Client()

@cli.event
async def on_ready():
    log.warning("Logged in as " + cli.user.name + " (" + str(cli.user.id) + ")")

def cleanup():
    log.warning("purging old data from database")
    now = datetime.datetime.utcnow()
    db.usercache.remove({
        "date": {"$lt": now - datetime.timedelta(minutes=30)}
    })
    db.playwithme.remove({
        "end": {"$lt": now}
    })

async def get_user(id):
    now = datetime.datetime.utcnow()
    user = db.usercache.find_one({
        "id": id,
        "date": {"$gt": now - datetime.timedelta(minutes=30)}
    })
    if user:
        return user
    user = await cli.get_user_info(id)
    db.usercache.insert_one({
        "id": id,
        "mention": user.mention,
        "date": now
    })
    return await get_user(id)

async def search_teammates(who, query, notify=True):
    cal = parsedatetime.Calendar()

    if " for " in query or " until " in query:
        delimit = query.rfind("for")
        if delimit == -1:
            delimit = query.rfind("until")

        startstr = query[:delimit]
        endstr = query[delimit:]
    else:
        startstr = query
        endstr = "for 30 minutes"

    start = cal.parseDT(startstr)[0]
    end = cal.parseDT(endstr, sourceTime=start)[0]

    if notify:
        db.playwithme.insert_one({
            "player": who.id,
            "start": start,
            "end": end
        })

    log.info(who.name + " requested a game " + ", ".join([str(d) for d in (start, end)]))

    players = []
    query = {
        "$or": [
            {
                "start": {
                    "$gte": start,
                    "$lte": end
                }
            },
            {
                "end": {
                    "$gte": start,
                    "$lte": end
                }
            },
            {
                "start": {"$lte": start},
                "end": {"$gte": end}
            }
        ]
    }
    for teammate in db.playwithme.find(query):
        mention = (await get_user(teammate["player"]))["mention"]
        if not mention in players:
            players += [mention]
    if len(players) > 1 or (len(players) == 1 and not notify):
        return ", ".join(players) + " can play."
    else:
        if notify:
            return "Nobody can play at that time. I will notify you if anyone wants to play between %s and %s. It is now %s." % (start.strftime("%H:%M"), end.strftime("%H:%M"), datetime.datetime.now().strftime("%H:%M"))
        else:
            return "Nobody can play at that time."

@cli.event
async def on_message(message):
    msg = message.content.lower()
    if msg.startswith("?ping"):
        await cli.send_message(message.channel, "Pong!")

    if msg.startswith("?about"):
        await cli.send_message(message.channel, "Vainglory Discord bot " + VERSION + " written & hosted by shutterfly")

    if msg.startswith("?help"):
        await cli.send_message(message.channel, "Commands: ?help, ?ping, ?about")
        await cli.send_message(message.channel, "<play with me [now (default) | in (timespan) | at,from (time)] [for (timespan, default 30 minutes) | until (time)]> to find teammates.")
        await cli.send_message(message.channel, "<who can play [now (default) | in (timespan) | at,from (time)] [for (timespan, default 30 minutes) | until (time)]> to see who registered for notifications.")
        await cli.send_message(message.channel, "<don't play with me> to cancel.")

    if msg.startswith("play with me") or msg.startswith("who can play"):
        if msg.startswith("play with me"):
            when = message.content[len("play with me"):]
            notify = True
        else:
            when = message.content[len("who can play"):]
            notify = False
        response = await search_teammates(message.author, when, notify)
        await cli.send_message(message.channel, response)

    if msg.startswith("don't play with me") or msg.startswith("dont play with me"):
        db.playwithme.remove({"player": message.author.id})
        await cli.send_message(message.channel, "Canceled all notifications.")

    #
    # "play" role Discoid backwards compatibility
    #
    if msg.startswith("\\getrole play") or msg.startswith("\\play"):
        # toggles the "play" role
        log.info("toggled " + message.author.name + "'s play role")
        for role in message.author.roles:
            if role.name == "play":
                await cli.remove_roles(message.author, role)
                await cli.send_message(message.channel, "Removed the 'play' role.")
                return

        for role in message.server.roles:
            if role.name == "play":
                await cli.add_roles(message.author, role)
                await cli.send_message(message.channel, "Added the 'play' role.")

if __name__ == '__main__':
    logging.basicConfig()
    log = logging.getLogger()
    log.setLevel(logging.INFO)
    threading.Timer(10 * 60, cleanup).start()
    cli.run(TOKEN)