#!/usr/bin/python3 
# -*- coding: utf-8 -*-

import datetime
import os.path
import asyncio
import logging
import argparse
import websockets
import socketserver
import configparser
import os
from collections import deque
from urllib.parse import urlparse, parse_qs
from ansi2html import Ansi2HTMLConverter

current_dir = os.getcwd()
config = configparser.ConfigParser()
config.read(current_dir + '/logtailer.ini')



# init
logging.basicConfig(format='%(asctime)s %(levelname)s %(message)s', level=logging.INFO)
conv = Ansi2HTMLConverter(inline=True)

@asyncio.coroutine
def view_log(websocket, path):
    global config
    logging.info('Connected, remote={}, path={}'.format(websocket.remote_address, path))

    try:
        try:
            parse_result = urlparse(path)
        except Exception:
            raise ValueError('Fail to parse URL')

        NUM_LINES = int(config['MMDVMHost']['Num_Lines'])
        path = os.path.abspath(parse_result.path)
        now = datetime.datetime.now()
        year = str(now.year)
        month = str(now.month)
        if len(month) == 1:
            month = "0" + month
        day = str(now.day)
        if len(day) == 1:
            day = "0" + day

        file_path = ""
        if path == "/MMDVM":
            file_path = config['MMDVMHost']['Logdir']+config['MMDVMHost']['Prefix']+"-"+year+"-"+month+"-"+day+".log"
        elif path == "/DAPNET":
            file_path = config['DAPNETGateway']['Logdir']+config['DAPNETGateway']['Prefix']+"-"+year+"-"+month+"-"+day+".log"
            NUM_LINES = 0
        logging.info(file_path)
        if not os.path.isfile(file_path):
            raise ValueError('Not found')

        with open(file_path, newline = '\n') as f:

            content = ''.join(deque(f, NUM_LINES))
            content = conv.convert(content, full=False)
            lines = content.split("\n")
            for line in lines:
                yield from websocket.send(line)

            while True:
                content = f.read()
                if content:
                    content = conv.convert(content, full=False)
                    yield from websocket.send(content)
                else:
                    yield from asyncio.sleep(1)

    except ValueError as e:
        try:
            yield from websocket.send('<font color="red"><strong>{}</strong></font>'.format(e))
            yield from websocket.close()
        except Exception:
            pass

        log_close(websocket, path, e)

    except Exception as e:
        log_close(websocket, path, e)

    else:
        log_close(websocket, path)


def log_close(websocket, path, exception=None):
    message = 'Closed, remote={}, path={}'.format(websocket.remote_address, path)
    if exception is not None:
        message += ', exception={}'.format(exception)
    logging.info(message)


def websocketserver():
    start_server = websockets.serve(view_log, config['DEFAULT']['Host'], config['DEFAULT']['Port'])
    asyncio.get_event_loop().run_until_complete(start_server)
    asyncio.get_event_loop().run_forever()


def main():
    websocketserver()


if __name__ == '__main__':
    main()