#!/usr/bin/env python
# -*- coding: utf-8 -*-
# vi:si:et:sw=4:sts=4:ts=4
from __future__ import division, print_function

import json
import os
import signal
import sys
import mimetypes

from tornado.httpserver import HTTPServer
from tornado.ioloop import IOLoop, PeriodicCallback
from tornado.web import Application
import tornado

import websocket
from websocket import trigger_event
import state
from tasks import Tasks
from utils import json_dumps
import link

import logging
logger = logging.getLogger('server')

root_dir = os.path.normpath(os.path.abspath(os.path.dirname(__file__)))
STATIC_PATH = os.path.join(root_dir, 'static')

class BaseHandler(tornado.web.RequestHandler):

    def serve_static(self, path, mimetype=None, include_body=True):
        if not mimetype:
            mimetype = mimetypes.guess_type(path)[0]
        logging.debug('serve %s', path)
        if os.path.exists(path):
            self.set_header('Content-Type', mimetype)
            self.set_header('Content-Length', str(os.stat(path).st_size))
            if include_body:
                with open(path) as fd:
                    self.write(fd.read())
        else:
            self.set_status(404)
        return

    def render_json(self, response):
        response = json_dumps(response)
        self.set_header('Content-Type', 'application/json')
        self.set_header('Content-Length', str(len(response)))
        self.write(response)
        self.finish()

class RemoteHandler(BaseHandler):

    def post(self, action):
        data = json.loads(self.request.body)
        response = {}
        print ('GOT remote request', action, data)
        if action == 'info':
            response = state.info
        elif action == 'message':
            data['from'] = self.request.headers['From']
            trigger_event(action, data)
        else:
            response = {'error': 'unknown action'}
        return self.render_json(response)

class MainHandler(BaseHandler):

    def get(self, path):
        path = path[1:]
        if not path:
            path = 'index.html'
        path = os.path.join(STATIC_PATH, path)
        self.serve_static(path)

    def post(self, path):
        action = path.split('/')[1]
        data = json.loads(self.request.body)
        response = {}
        if action in ('info', 'ping'):
            if 'id' in data:
                id = data['id']
                del data['id']
                response = link.remote_json(id, action, data)
        return self.render_json(response)

if __name__ == '__main__':
    address = ''
    port = 8000

    if len(sys.argv) > 1:
        port = int(sys.argv[1])
        link.PEERLINK=sys.argv[2]

    logging.basicConfig(level=logging.DEBUG)

    options = {
        'debug': True,
    }
    handlers = [
        (r'/ws', websocket.Handler),
        (r"/remote/(.*)", RemoteHandler),
        (r"(.*)", MainHandler),
    ]

    http_server = HTTPServer(Application(handlers, **options))

    http_server.listen(port, address)

    state.tasks = Tasks()
    state.main = IOLoop.instance()

    state._status = PeriodicCallback(lambda: state.info.update(link.post('info')), 60000)
    state._status.start()

    if ':' in address:
        host = '[%s]' % address
    elif not address:
        host = '[::1]'
    else:
        host = address
    url = 'http://%s:%s/' % (host, port)

    link.add('chat', url + 'remote/')
    state.info = link.post('info')

    print('listening at %s' % url)

    def shutdown():
        state.tasks.join()
        http_server.stop()

    signal.signal(signal.SIGTERM, shutdown)

    try:
        state.main.start()
    except:
        print('shutting down...')
    shutdown()