import json
import logging
import os
import signal
import socket
import sys
import threading
import time
import traceback
from optparse import OptionParser
from threading import Thread
from typing import List, Set, Dict

from tornado import ioloop

sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))

from common.speed_limit import SpeedLimiter
from common.websocket import WebSocketException

from client.clear_nonce_task import ClearNonceTask
from client.heart_beat_task import HeatBeatTask
from client.tcp_forward_client import TcpForwardClient
from common import websocket
from common.logger_factory import LoggerFactory
from common.nat_serialization import NatSerialization
from constant.message_type_constnat import MessageTypeConstant
from constant.system_constant import SystemConstant
from context.context_utils import ContextUtils
from entity.client_config_entity import ClientConfigEntity
from entity.message.message_entity import MessageEntity
from entity.message.push_config_entity import PushConfigEntity, ClientData
from entity.message.tcp_over_websocket_message import TcpOverWebsocketMessage
from exceptions.duplicated_name import DuplicatedName

try:
    from common.websocket._logging import _logger
except (ImportError, ModuleNotFoundError):
    _logger = None

DEFAULT_CONFIG = './config_c.json'

DEFAULT_LOGGER_LEVEL = logging.INFO

NAME_TO_LEVEL = {
    'debug': logging.DEBUG,
    'info': logging.INFO,
    'warn': logging.WARN,
    'error': logging.ERROR
}

OPEN_CLOSE_LOCK = threading.Lock()

name_to_speed_limiter: Dict[str, SpeedLimiter] = {}


def get_config() -> ClientConfigEntity:
    parser = OptionParser(usage="""usage: %prog -c config_c.json 
    
config_c.json example: 
{
  "server": {
    "url": "ws://192.168.9.224:18888/websocket_path",
    "password": "helloworld"
  },
   "client_name": "ubuntu1",
  "client": [
    {
      "name": "ssh1",
      "remote_port": 12222,
      "local_port": 22,
      "local_ip": "127.0.0.1"
    }
  ],
  "log_file": "/var/log/nt/nt.log"
}
    """, version=SystemConstant.VERSION)
    parser.add_option("-c", "--config",
                      type='str',
                      dest='config',
                      default=DEFAULT_CONFIG,
                      help="config json file"
                      )
    parser.add_option("-l", "--level",
                      type='str',
                      dest='log_level',
                      default='info',
                      help="log level: debug, info, warn , error"
                      )
    (options, args) = parser.parse_args()
    log_level = options.log_level
    if log_level not in NAME_TO_LEVEL:
        print('invalid log level.')
        sys.exit()
    ContextUtils.set_log_level(NAME_TO_LEVEL[log_level])
    config_path = options.config
    with open(config_path, 'r') as rf:
        config_data: ClientConfigEntity = json.loads(rf.read())
    ContextUtils.set_config_file_path(os.path.abspath(config_path))
    ContextUtils.set_password(config_data['server']['password'])
    name_set: Set[str] = set()
    config_data.setdefault('client', [])
    for client in config_data['client']:
        if client['name'] in name_set:
            raise DuplicatedName()
        name_set.add(client['name'])
    return config_data


class WebsocketClient:
    def __init__(self, ws: websocket.WebSocketApp, tcp_forward_client, heart_beat_task, config_data: ClientConfigEntity):
        self.ws: websocket.WebSocketApp = ws
        self.ws.on_message = self.on_message
        self.ws.on_close = self.on_close
        self.ws.on_open = self.on_open
        self.forward_client: TcpForwardClient = tcp_forward_client
        self.heart_beat_task = heart_beat_task
        self.config_data: ClientConfigEntity = config_data

    def on_message(self, ws, message: bytes):
        try:
            message_data: MessageEntity = NatSerialization.loads(message, ContextUtils.get_password())
            start_time = time.time()
            time_ = message_data['type_']
            if message_data['type_'] == MessageTypeConstant.WEBSOCKET_OVER_TCP:
                data: TcpOverWebsocketMessage = message_data['data']
                uid = data['uid']
                name = data['name']
                b = data['data']
                create_result = self.forward_client.create_socket(name, uid, data['ip_port'], name_to_speed_limiter.get(name))
                if create_result:
                    self.forward_client.send_by_uid(uid, b)
            elif message_data['type_'] == MessageTypeConstant.REQUEST_TO_CONNECT:
                data: TcpOverWebsocketMessage = message_data['data']
                uid = data['uid']
                name = data['name']
                b = data['data']
                self.forward_client.create_socket(name, uid, data['ip_port'], name_to_speed_limiter.get(name))
            elif message_data['type_'] == MessageTypeConstant.PING:
                self.heart_beat_task.set_recv_heart_beat_time(time.time())
            elif message_data['type_'] == MessageTypeConstant.PUSH_CONFIG:
                push_config: PushConfigEntity = message_data['data']
                for d in push_config['config_list']:
                    if d.get('speed_limit'):
                        name_to_speed_limiter[d['name']] = SpeedLimiter(d['speed_limit'])
        except Exception:
            LoggerFactory.get_logger().error(traceback.format_exc())
        # LoggerFactory.get_logger().debug(f'on message {time_} cost time {time.time() - start_time}')

    def on_error(self, ws, error):
        LoggerFactory.get_logger().error(f'error:  {error} ')

    def on_close(self, ws, a, b):
        with OPEN_CLOSE_LOCK:
            LoggerFactory.get_logger().info(f'close, {a}, {b} ')
            self.heart_beat_task.is_running = False
            self.forward_client.close()

    def on_open(self, ws):
        with OPEN_CLOSE_LOCK:
            try:
                LoggerFactory.get_logger().info('open success')
                push_client_data: List[ClientData] = self.config_data['client']
                client_name = self.config_data.get('client_name', socket.gethostname())
                push_configs: PushConfigEntity = {
                    'key': ContextUtils.get_password(),
                    'config_list': push_client_data,
                    "client_name": client_name,
                    'version': SystemConstant.VERSION
                }
                message: MessageEntity = {
                    'type_': MessageTypeConstant.PUSH_CONFIG,
                    'data': push_configs
                }
                self.heart_beat_task.set_recv_heart_beat_time(time.time())

                ws.send(NatSerialization.dumps(message, ContextUtils.get_password()), websocket.ABNF.OPCODE_BINARY)
                self.forward_client.is_running = True
                self.heart_beat_task.is_running = True
                task = Thread(target=self.forward_client.start_forward)
                task.start()
            except Exception:
                LoggerFactory.get_logger().error(traceback.format_exc())


def signal_handler(sig, frame):
    print('You pressed Ctrl+C!')
    os._exit(0)


def run_client(ws: websocket.WebSocketApp):
    while True:
        try:
            ws.run_forever()  # Set dispatcher to automatic reconnection
        except WebSocketException as e:
            LoggerFactory.get_logger().warn('WebSocketException: {}'.format(e))
            time.sleep(5)
        except Exception as e:
            LoggerFactory.get_logger().error(traceback.format_exc())
            time.sleep(5)
            continue
        LoggerFactory.get_logger().info(f'try after 2 seconds')
        time.sleep(2)


def main():
    print('github: ', SystemConstant.GITHUB)
    config_data = get_config()
    signal.signal(signal.SIGINT, signal_handler)
    websocket.setdefaulttimeout(3)
    server_config = config_data['server']
    if not server_config['password']:
        raise Exception('密码不能为空, password is required')
    log_path = config_data.get('log_file')
    ContextUtils.set_log_file(log_path)
    ContextUtils.set_nonce_to_time({})
    url = server_config.get('url', '')
    if not url:
        url = ''
        if server_config['https']:
            url += 'wss://'
        else:
            url += 'ws://'
        url += f"{server_config['host']}:{str(server_config['port'])}{server_config['path']}"
    LoggerFactory.get_logger().info(f'start open {url}')
    ws = websocket.WebSocketApp(url)
    forward_client = TcpForwardClient(ws)
    heart_beat_task = HeatBeatTask(ws)
    WebsocketClient(ws, forward_client, heart_beat_task, config_data)
    LoggerFactory.get_logger().info('start run_forever')
    Thread(target=run_client, args=(ws,)).start()  # 为了使用tornado的ioloop 方便设置超时
    ioloop.PeriodicCallback(heart_beat_task.run, SystemConstant.HEART_BEAT_INTERVAL * 1000).start()
    clear_nonce_stak = ClearNonceTask()
    ioloop.PeriodicCallback(clear_nonce_stak.run, 1800 * 1000).start()
    ioloop.IOLoop.current().start()


if __name__ == '__main__':
    main()