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#!/usr/bin/env python3
import argparse
import configparser
import logging
import signal
import sys
import threading
import os

from project import botmanager
from project import uptimeservice

class BotLauncher(object):
    CONFIG_FILE = "bot.config"

    @staticmethod
    def sigint_handler(signal, frame):
        """Exit gracefully when receiving an interrupt signal"""
        logging.info("Stopping uptime services (if any)...")
        uptimeservice.UptimeService.stop_services()
        print("Exiting radiodiodibot...")
        sys.exit(0)

    def __init__(self):
        signal.signal(signal.SIGINT, BotLauncher.sigint_handler)

        try:  # Python 2.7+
            from logging import NullHandler
        except ImportError:
            class NullHandler(logging.Handler):
                def emit(self, record):
                    pass

        # Read configs, unsuccessful reads are
        # silently ignored
        self.config = configparser.ConfigParser()
        self.config.read(BotLauncher.CONFIG_FILE)

        # Get the bot token as an argument from the user
        parser = argparse.ArgumentParser(
            description="""Telegram bot for the Radiodiodi Student Radio broadcast.
                           Please configure the bot with 'bot.config' before launching.""")
        parser.add_argument("-v", "--verbose", help="Verbose output", action="store_true")
        self.args = parser.parse_args()

        # Show verbose output with the -v option
        if self.args.verbose:
            logging_level = logging.INFO
        else:
            logging_level = logging.WARNING

        formatter = logging.Formatter("%(asctime)s %(levelname)s %(message)s")
        logging.getLogger().addHandler(NullHandler())
        fileLogger = logging.FileHandler("output.log")
        fileLogger.setFormatter(formatter)

        consoleLogger = logging.StreamHandler()
        consoleLogger.setFormatter(formatter)

        logging.getLogger().addHandler(fileLogger)
        logging.getLogger().addHandler(consoleLogger)
        logging.getLogger().setLevel(logging_level)

        # Try to import telepot
        # If not installed, inform user and fail gracefully
        try:
            import telepot
        except:
            print("radiodiodibot needs the telepot module to communicate with Telegram.")
            print("Please install telepot before using radiodiodibot.")
            sys.exit(1)

    def run_uptime(self, port):
        logging.info("Setting up uptime service...")
        self.uptime_server = uptimeservice.UptimeService(int(port))
        self.uptime_server.start()

    # Entry point
    def main(self):
        print("=== Radiodiodibot ===")
        print("Press CTRL-C to exit.")
        # Get default parameter values from the config file
        try:
            telegram_bot_token = self.config["GENERAL"]["TelegramBotToken"]
            shoutbox_api_url = self.config["GENERAL"]["ShoutboxApiUrl"]
            telegram_chat_id = self.config["GENERAL"]["TelegramChatID"]
            api_call_interval = int(self.config["GENERAL"]["ApiCallInterval"])
            api_auth_token = self.config["GENERAL"]["ApiAuthToken"]
            uptime_port = self.config["UPTIME"]["Port"]
        except:
            logging.fatal("Config file '{}' is malformed. Please reconfigure radiodiodibot.".format(
                BotLauncher.CONFIG_FILE
            ))
            sys.exit(1)

        # Store the final values in a manager instance
        manager = botmanager.BotManager(telegram_bot_token)
        manager.set_parameters(shoutbox_api_url, telegram_chat_id, api_call_interval, api_auth_token)

        logging.info("Using Shoutbox API URL: {}".format(shoutbox_api_url))
        logging.info("Using Telegram Chat ID: {}".format(telegram_chat_id))
        logging.info("Using API call interval of {} seconds.".format(api_call_interval))

        # Start uptime server if user has provided a port to bind
        if uptime_port is not None:
            self.run_uptime(uptime_port)

        # Start listening
        manager.start()
        sys.exit(0)

    def launch(self):
        self.main()


def main():
    l = BotLauncher()
    l.launch()

if __name__ == "__main__":
    main()