#!/usr/bin/env python

import urllib
import contextlib
import json
import time
import os
from credentials import *
from twitter import *
from datetime import datetime

class SublabStatus(object):
    json = None
    def get_json(self):
        if self.json is not None:
            return self.json
        try:
            with contextlib.closing(urllib.urlopen('http://[2a02:238:f02a:9800:caa0:30ff:feb4:2185]/')) as response:
                self.json = json.load(response)
            return self.json
        except IOError:
            with contextlib.closing(urllib.urlopen('http://beaglebone.local.sublab.org/')) as response:
                self.json = json.load(response)
            return self.json

    def door_status(self):
        try:
            self.get_json()
        except Exception:
            return 'unkown'

        door_status = self.json['door.lock']

        if door_status['ts'] + 120 < time.time():
            return 'unknown'

        if not door_status['value']:
            return 'open'
        else:
            return 'closed'

def tweet(status, last_change):

    # Contents of the status tweet
    # Max. 110 Characters, or tweet will be too long!
    SEPARATOR = ' - '
    DATE_MSG = 'Last change was on'
    SUBLAB_CLOSED = 'OH NOEZ! sublab is now closed.' + SEPARATOR + DATE_MSG + ' '
    SUBLAB_OPEN = 'YAY! sublab is now open' + SEPARATOR + DATE_MSG + ' '
    SUBLAB_UNKNOWN = "DAMN SON! Current status of @sublab couldn't be retrieved" + ' '

    if status == 'open':
        tweet = SUBLAB_OPEN + last_change
    elif status == 'closed':
        tweet = SUBLAB_CLOSED + last_change
    elif status == 'unknown':
        tweet = SUBLAB_UNKNOWN

    if len(tweet) <= 140:

        #instance of the twitter-class to post status changes
        t = Twitter(auth=OAuth(token,
            token_key,
            con_secret,
            con_secret_key))

        t.statuses.update(status=tweet)
    else:
        print "Message too long: " + tweet

def update_css(statusimage):
    css = '''
#statusimage {
    background: url(../img/%s) ;
    height: 40px;
    width: 40px;
    margin: 5px;
}


''' % statusimage

    path = os.path.realpath(os.path.dirname(__file__))
    path = os.path.join(path, '..', 'public', 'css', 'sublab.status.css')
    path_new = path + '.new'

    with open(path_new, 'w') as css_file:
        css_file.write(css)
    os.rename(path_new, path)



def save_statusfile(STATUSFILE, status):
    date_now = datetime.now().strftime("%a %d. %b %Y at %H:%M")
    with open(STATUSFILE, 'w') as status_file:
        status_file.write(status + '\n' + date_now + '\n')


if __name__ == '__main__':

    STATUSFILE = 'sublab-doorstatus.last'

    # instance of class which gets current status
    s = SublabStatus()

    # read file with last status
    try:
        with open(STATUSFILE, 'r') as status_file:
            old_status = status_file.readline().rstrip()
            last_change = status_file.readline().rstrip()
    except Exception:
        save_statusfile(STATUSFILE, s.door_status())
        exit()

    # check if status changed, if yes, update css and tweet it
    if s.door_status() != old_status:
        if s.door_status() == 'open':
            update_css('status-open.png')
            save_statusfile(STATUSFILE, s.door_status())
            tweet('open', last_change)
        elif s.door_status() == 'closed':
            save_statusfile(STATUSFILE, s.door_status())
            update_css('status-closed.png')
            tweet('closed', last_change)
        else:
            save_statusfile(STATUSFILE, s.door_status())
            update_css('status-unknown.png')
            tweet('unknown', last_change)