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

import http.server
import threading
import ssl
import os
import sys
import logging
from http.server import BaseHTTPRequestHandler
from time import sleep
from cme.helpers.logger import highlight
from cme.logger import CMEAdapter

class RequestHandler(BaseHTTPRequestHandler):

    def log_message(self, format, *args):
        server_logger = CMEAdapter(extra={'module': self.server.module.name.upper(), 'host': self.client_address[0]})
        server_logger.info("- - %s" % (format%args))

    def do_GET(self):
        if hasattr(self.server.module, 'on_request'):
            server_logger = CMEAdapter(extra={'module': self.server.module.name.upper(), 'host': self.client_address[0]})
            self.server.context.log = server_logger
            self.server.module.on_request(self.server.context, self)

    def do_POST(self):
        if hasattr(self.server.module, 'on_response'):
            server_logger = CMEAdapter(extra={'module': self.server.module.name.upper(), 'host': self.client_address[0]})
            self.server.context.log = server_logger
            self.server.module.on_response(self.server.context, self)

    def stop_tracking_host(self):
        '''
            This gets called when a module has finshed executing, removes the host from the connection tracker list
        '''
        try:
            self.server.hosts.remove(self.client_address[0])
            if hasattr(self.server.module, 'on_shutdown'):
                self.server.module.on_shutdown(self.server.context, self.server.connection)
        except ValueError:
            pass

class CMEServer(threading.Thread):

    def __init__(self, module, context, logger, srv_host, port, server_type='https'):

        try:
            threading.Thread.__init__(self)

            self.server = http.server.HTTPServer((srv_host, int(port)), RequestHandler)
            self.server.hosts   = []
            self.server.module  = module
            self.server.context = context
            self.server.log     = CMEAdapter(extra={'module': self.server.module.name.upper()})
            self.cert_path      = os.path.join(os.path.expanduser('~/.cme'), 'cme.pem')
            self.server.track_host = self.track_host

            logging.debug('CME server type: ' + server_type)
            if server_type == 'https':
                self.server.socket = ssl.wrap_socket(self.server.socket, certfile=self.cert_path, server_side=True)

        except Exception as e:
            errno, message = e.args
            if errno == 98 and message == 'Address already in use':
                logger.error('Error starting HTTP(S) server: the port is already in use, try specifying a diffrent port using --server-port')
            else:
                logger.error('Error starting HTTP(S) server: {}'.format(message))

            sys.exit(1)

    def base_server(self):
        return self.server

    def track_host(self, host_ip):
        self.server.hosts.append(host_ip)

    def run(self):
        try:
            self.server.serve_forever()
        except:
            pass

    def shutdown(self):
        try:
            while len(self.server.hosts) > 0:
                self.server.log.info('Waiting on {} host(s)'.format(highlight(len(self.server.hosts))))
                sleep(15)
        except KeyboardInterrupt:
            pass

        # shut down the server/socket
        self.server.shutdown()
        self.server.socket.close()
        self.server.server_close()

        # make sure all the threads are killed
        for thread in threading.enumerate():
            if thread.is_alive():
                try:
                    thread._stop()
                except:
                    pass