import argparse
import atexit
import base64
import glob
import io
import json
import logging
import os
import re
import select
import socket
import sys
import subprocess
from subprocess import PIPE
import struct
import threading
import time
import urllib
from urllib.parse import urlparse

from matrix_client.api import MatrixHttpApi
import requests
from flask import Flask, jsonify, request


#constants
global_config = {}

#
app = Flask(__name__)
minecraft = None
roomsync = {}

LOG = logging.getLogger(__name__)


class socket_util(object):
    def __init__(self, host, port):
        self.host = host
        self.port = port
        self.soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.soc.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.msglist = []
        self.addr = None
        LOG.info ("Socket Init Complete")
        self.proc = None
        self.exit = False
        atexit.register(self.close_socket)
        LOG.info("Starting Messaging Thread")
        msg_process = threading.Thread(target=self.msg_process)
        msg_process.daemon = True
        msg_process.start()
        
    def msg_process(self):
        raise NotImplementedError("Please Implement this method")
           
    def socket_reset(self):
        self.soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.soc.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.msglist = []
        self.addr = None
            
    def close_socket(self):
        self.soc.close()
            
    def send(self, message):
        #select returns (readable, writable, error) status on the objects passed in the corresponding lists
        r, w, e = select.select([], [self.soc], [], 1)
        #LOG.info("w" + str(w))
        if w == []:
            return 1
        string_message = json.dumps(message)
        select.select([], [self.soc], [])
        self.write_int(len(string_message))
        self.write(string_message.encode('utf-8'))
        return 0

    def write_int(self,  integer):
        integer_buf = struct.pack('>i', integer)       
        self.write(integer_buf)

    def write(self, data: bytes):
        #socket.bind(address)
        data_len = len(data)
        offset = 0
        while offset != data_len:
            offset += self.soc.send(data[offset:])

    def receive(self):
        r,s,e = select.select([self.soc], [], [], 1)
        #LOG.info("r" + str(r))
        if r == []:
            return ""
        message_size = self.read_int()
        if message_size == None:
            self.close_socket()
            return None
        data = self.read(message_size)
        if data == None:
            LOG.debug("data_none")
            return None
        message = json.loads(data)

        return message

    def read_int(self):
        int_size = struct.calcsize('>i')
        intbuf = self.read(int_size)
        if intbuf == None:
            return None
        return struct.unpack('>i', intbuf)[0]

    def read(self, size):
        data = ""
        while len(data) != size:
            newdata = self.soc.recv(size - len(data))
            if len(newdata) == 0:
               return None
            data = data + newdata
        return data

class MinecraftWrapper(socket_util):
    def __init__(self, command, host, port):
        self.logger = LOG.getChild("MinecraftWrapper")
        super().__init__(host, port)
        self.logger.debug(command)
        self.command = command
        self.logger.info("Starting Wrapper Polling Thread")
        poll_process = threading.Thread(target=self.cli_poll)
        poll_process.daemon = True
        poll_process.start()
        self.socket_reset()
        
    def socket_reset(self):
        super().socket_reset()
        self.logger.debug("Connecting to {}:{}".format(self.host, self.port))
        backoff = 1
        while True:
            try:
                self.soc.connect((self.host, self.port))
                break
            except OSError as e:
                if e.errno == 111:
                    LOG.warning(
                        "Connection refused by {}:{}, trying again in {} seconds".format(
                            self.host, self.port, backoff
                        )
                    )
                    time.sleep(backoff)
                    backoff *= 2
                else:
                    raise e
        self.logger.info("Socket Connected")
            
    def exe_mc(self):
        self.proc = subprocess.Popen(
            " ".join(self.command), shell=True, stdout=PIPE, stdin=PIPE, universal_newlines=True
        )
        for stdout_line in iter(self.proc.stdout.readline, ""):
            yield stdout_line
        return_code = self.proc.wait()
        if return_code:
            raise subprocess.CalledProcessError(return_code, self.command)
            
    def msg_process(self):
        while(not self.exit):
            try:
                self.proc_monitor()
                status = 1
                if len(self.msglist) > 0:
                    status = self.send(self.msglist[-1])
                rcv = self.receive()
                if rcv != "" and rcv != None:
                        self.msg_handle(rcv)
                if status == 0: self.msglist.pop()
            except Exception as e:
                self.logger.exception(e)
                self.socket_reset()
        
            
    def msg_handle(self, msg):
        if len(msg) > 0:
            if msg[0] == '/':
                self.proc.stdin.write(msg + '\n')
            else:
                LOG.info(msg)
                
    def proc_monitor(self):
        try:
            if self.proc is not None and self.proc.poll() is not None:
                self.exit = True
                self.close_socket()
                sys.exit(0)
        except Exception as e:
            self.logger.exception("poll error")
            pass
    
    def cli_poll(self):
        prog = re.compile("\[.*\] \[(.*)\] \[(.*)\]: <(.*)> (.*)")
        EXAMPLE = "[07:36:28] [Server thread/INFO] [minecraft/DedicatedServer]: <khr_> test"
        for line in self.exe_mc():
            self.logger.info(line.rstrip('\n'))
            result = prog.search(line)
            if result:
                self.logger.info("user: " + result.group(3) + " msg: " +result.group(4).rstrip('\n'))
                self.msglist.insert(0, {"user":result.group(3),"msg":result.group(4).rstrip('\n')})
        
class MinecraftServerBridge(socket_util):
    def __init__(
        self,
        minecraft_bind_host: int,
        minecraft_bind_port: int,
        matrix_bind_port: int,
        appservice_token: str
    ):
        #starting threads
        LOG.info ("Starting Appservice Webserver")
        flask_thread = threading.Thread(target=app.run,kwargs={ "port": minecraft_bind_port })
        flask_thread.daemon = True
        flask_thread.start()
    
        #socket and other init
        super().__init__(minecraft_bind_host, minecraft_bind_port)
        LOG.info ("Calling Matrix Api")
        self.api = MatrixHttpApi("http://localhost:8008", token=appservice_token)
        self.user_re = re.compile("(?<=\@).*(?=\:)")
        self.avatar_update_log = {}
        LOG.info ("Finished Init")
            
        
    def socket_reset(self):
        super().socket_reset()
        LOG.info("Server Binding to " + self.host + " " + str(self.port))
        backoff = 1
        while True:
            try:
                self.soc.bind((self.host, self.port))
                break
            except OSError as e:
                if e.errno == 98:
                    LOG.warning(
                        "Unable to bind to port {}, trying again in {} seconds".format(
                            self.port, backoff
                        )
                    )
                    time.sleep(backoff)
                    backoff *= 2
                else:
                    raise e
        LOG.info("Server Bound")
        self.soc.listen(1)
        LOG.info("Server listen to host")
        self.soc, self.addr = self.soc.accept()
        self.soc.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        LOG.info("Server accepted connection: " + str(self.addr))
            
        
    def msg_process(self):
        while(True):
            try:
                if len(self.msglist) > 0:
                    status = self.send(self.msglist[-1])
                    if status == 0: self.msglist.pop()
                rcv = self.receive()
                if rcv != "" and rcv != None:
                    self.msg_handle(rcv)
            except Exception as e:
                LOG.info(e)
                self.socket_reset()
        
                    
    def msg_handle(self, msg):
        #for msg, create user and post as user
        #add minecraft user to minecraft channel, if this fails, no big deal
        try:
            LOG.info("trying to create id...")
            new_user = "@mc_" + msg['user']
            user_id = new_user + ":" + global_config['server_name']
            self.api.register("m.login.application_service",username =  "mc_" + msg['user'])
        except Exception as e:
            LOG.exception(e)
        #for each room we're aware of, post server chat inside. Eventually 1 room should equal 1 server
        for room in roomsync:
            #generate a unique transaction id based on the current time
            txn_id = str(int(time.time() * 1000))
            #attempt to join room
            LOG.info("trying to join room as user and as bridge manager")
            self.api._send("POST", '/rooms/'+room+'/join', query_params={"user_id": user_id}, headers={"Content-Type":"application/json"})
            self.api._send("POST", '/rooms/'+room+'/join', headers={"Content-Type":"application/json"})
            #set our display name to something nice
            LOG.info("trying to set display name...")
            self.api._send("PUT", '/profile/'+user_id+'/displayname/', content={"displayname":msg["user"]}, query_params={"user_id": user_id}, headers={"Content-Type":"application/json"})
            
            #get our mc skin!!
            #backup: #avatar_url = "https://www.minecraftskinstealer.com/face.php?u="+msg['user']
            #only get this if the user hasn't updated in a long time
            LOG.info("Checking if we need to update avatar...")
            if msg['user'] not in self.avatar_update_log.keys() or abs(self.avatar_update_log[msg['user']] - time.time()) > 180:
                self.avatar_update_log[msg['user']] = time.time()
                avatar_url = self.get_mc_skin(msg['user'], user_id)
                if avatar_url:
                    LOG.info("avatar_url is " + avatar_url)
                    self.api._send("PUT", '/profile/'+user_id+'/avatar_url/', content={"avatar_url":avatar_url}, query_params={"user_id": user_id}, headers={"Content-Type":"application/json"})
                
            #attempt to post in room
            LOG.info("Attempting to post in Room")
            self.api._send("PUT", '/rooms/'+room+'/send/m.room.message/' + txn_id, content={"msgtype":"m.text","body":msg["msg"]}, query_params={"user_id": user_id}, headers={"Content-Type":"application/json"})
    
    def get_mc_skin(self, user, user_id):
        LOG.info("Getting Minecraft Avatar")
        from PIL import Image
        mojang_info = requests.get('https://api.mojang.com/users/profiles/minecraft/'+user).json() #get uuid
        mojang_info = requests.get('https://sessionserver.mojang.com/session/minecraft/profile/'+mojang_info['id']).json() #get more info from uuid
        mojang_info = json.loads(base64.b64decode(mojang_info['properties'][0]['value']))
        mojang_url = mojang_info['textures']['SKIN']['url']
        #r = requests.get(mojang_url, stream=True)
        #r.raw.decode_content = True # handle spurious Content-Encoding
        file = io.BytesIO(urllib.urlopen(mojang_url).read())
        im = Image.open(file)
        img_head = im.crop((8,8,16,16))
        image_buffer_head = io.BytesIO()
        img_head.save(image_buffer_head, "PNG")
        
        #compare to user's current id so we're not uploading the same pic twice
        #GET /_matrix/client/r0/profile/{userId}/avatar_url
        LOG.info("Getting Current Avatar URL")
        curr_url = self.api._send("GET", '/profile/'+user_id+'/avatar_url/', query_params={"user_id": user_id}, headers={"Content-Type":"application/json"})
        upload = True
        if 'avatar_url' in curr_url.keys():
            LOG.info("Checking Avatar...")
            file = io.BytesIO(urllib.urlopen(self.api.get_download_url(curr_url['avatar_url'])).read())
            im = Image.open(file)
            image_buffer_curr = io.BytesIO()
            im.save(image_buffer_curr, "PNG")
            if (image_buffer_head.getvalue()) == (image_buffer_curr.getvalue()):
                LOG.debug("Image Same")
                upload = False
        if upload:
            #upload img
            #POST /_matrix/media/r0/upload
            LOG.debug("Returning updated avatar")
            LOG.debug(image_buffer_head)
            return self.api.media_upload(image_buffer_head.getvalue(), "image/png")["content_uri"]
        else:
            return None
        
         
@app.route("/transactions/<transaction>", methods=["PUT"])
def on_receive_events(transaction):
    LOG.info("got event")
    events = request.get_json()["events"]
    for event in events:
        LOG.info("User: %s Room: %s" % (event["user_id"], event["room_id"]))
        LOG.info("Event Type: %s" % event["type"])
        LOG.info("Content: %s" % event["content"])
        roomsync[event["room_id"]] = ""
        if event['type'] == 'm.room.message' and \
           event['content']['msgtype'] == 'm.text' and \
           event["user_id"].find("@mc_") == -1:
            
            m_user = minecraft.user_re.search(event["user_id"]).group(0)
            m_cont = event['content']['body']
            minecraft.msglist.insert(0, "/tellraw @a {\"text\":\"<" + m_user + "> " + m_cont + "\",\"insertion\":\"/tellraw @p %s\"}")

    return jsonify({})

@app.route("/rooms/<room>", methods=["GET"])
def on_room(room):
    LOG.info("returning: " + str(room))
    return jsonify({})

    
bridge_cfg_skeleton = {"as_token":"", "server_name":"","bridge_mcdata_port":-1, "bridge_matrixapi_port":-1}
wrapper_cfg_skeleton = {"server_name":"","wrapper_mcdata_port":-1,}
def make_config(configfile, server=True):
    if not glob.glob(configfile):
        with open(configfile, 'w') as outfile:
            if server:
                json.dump(bridge_cfg_skeleton, outfile)
            else:
                json.dump(wrapper_cfg_skeleton, outfile)
        LOG.error("Please edit {0} and then run again!".format(configfile))
        sys.exit(0)
            
    elif glob.glob(configfile):
        with open(configfile) as config:
            read_config = json.load(config)
        return read_config


def main():
    logging.basicConfig(level=logging.DEBUG)

    parser = argparse.ArgumentParser()
    mode_group = parser.add_mutually_exclusive_group(required=True)
    mode_group.add_argument(
        "--minecraft_wrapper", 
        dest="mode",
        action="store_const",
        const="wrapper",
        help="Run in Minecraft server wrapper mode",
    )
    mode_group.add_argument(
        "--matrix_bridge", 
        dest="mode",
        action="store_const",
        const="bridge",
        help="Run in Matrix Appservice mode",
    )
    parser.add_argument("command", nargs=argparse.REMAINDER)
    args = parser.parse_args()

    if args.mode == "wrapper":
        LOG.info("Running Minecraft Server Wrapper Mode")
        global_config = make_config("wrapper.json", server=False)
        ip_addr_info = socket.gethostbyname_ex(global_config['server_name'])
        minecraft = MinecraftWrapper(
            args.command,
            host=ip_addr_info[2][0],
            port=global_config['wrapper_mcdata_port'],
        )
    else:
        LOG.info("Running Minecraft Matrix Bridge Mode")
        global_config = make_config("server.json", server=True)
        minecraft = MinecraftServerBridge(
            minecraft_bind_host="0.0.0.0",
            minecraft_bind_port=global_config['bridge_mcdata_port'],
            matrix_bind_port=global_config["bridge_matrixapi_port"],
            appservice_token=global_config["as_token"],
        )
    LOG.info("All Threads Running")
    while (not minecraft.exit):
        time.sleep(1)
    LOG.info("Calling exit() in main thread...")
    sys.exit()


if __name__ == "__main__":
    main()