#!/usr/bin/python
 
# By hads <epg@nice.net.nz>
# Released under the MIT license
# Last updated 2009-05-10
 
# xmltv.info
# 2007-08-19 - Trivial changes to adapt script to xmltv.info
# 2009-05-10 - Added feature to correct start time of each program by adding a fixed hour-offset
 
import os, sys
import httplib
import logging
import time
import datetime
import re
 
from datetime import datetime, timedelta
from optparse import OptionParser
from cStringIO import StringIO
from gzip import GzipFile
from urlparse import urlparse
 
NAME = 'tv_grab_de-py'
VERSION = '0.1'
DESCRIPTION = 'Germany (xmltv.info)'
HOUR_OFFSET = -2
 
SOURCES = (
       'http://www.tvprog.org/tv.xml',
)

# setup logging
log = logging.getLogger(NAME)
log.setLevel(logging.DEBUG)
ch = logging.StreamHandler()
ch.setLevel(logging.INFO)
ch.setFormatter(logging.Formatter('%(levelname)s - %(message)s'))
log.addHandler(ch)
 
try:
        try:
                from xml.etree import cElementTree as ElementTree
        except ImportError:
                from elementtree import ElementTree
except ImportError:
        log.critical('ElementTree is required and is not found')
        sys.exit(2)
 
def doDownload(source):
        """
        Download a gzipped file and return a string
        """
        host = urlparse(source)[1]
        url = urlparse(source)[2]
        log.info('Downloading data from %s...' % host)
 
        h = httplib.HTTPConnection(host)
        headers = {
                'User-Agent': '%s %s' % (NAME, VERSION),
                'Accept-encoding': 'xml',
        }
 
        h.request('GET', url, headers=headers)
        res = h.getresponse()
 
        if res.status != 200:
                return False
 
        log.info('Done')

	return res.read()

def getListings(cache=None):
        """
        Loop through listing sources and download them
        """
        if cache:
                try:
                        data = open(cache).read()
                except IOError:
                        pass
                else:
                        return data
        for source in SOURCES:
                res = doDownload(source)
                if res and len(res) > 0:
                        return res
                else:
                        log.error('Invalid data')
 
class XMLTVConfig(object):
        """
        Parses and writes configuration files in the XMLTV format
        """
 
        channels = []
        enabled_channels = []
 
        def __init__(self, conf_file):
                self.conf_file = conf_file
                try:
                        f = open(conf_file)
                except IOError:
                        self.exists = False
                else:
                        self.exists = True
                        i = 1
                        for line in f:
                                line = line.strip()
                                if line and line[0] != '#':
                                        if line.startswith('channel'):
                                                if '=' in line:
                                                        key, value = line.split('=', 1)
                                                        self.channels.append(value)
                                                        self.enabled_channels.append(value)
                                                elif '!' in line:
                                                        key, value = line.split('!', 1)
                                                        self.channels.append(value)
                                        else:
                                                log.info('Ignoring bad line in config file [%s:%s]', conf_file, i)
                                i += 1
                        f.close()
 
        def write(self):
                try:
                        f = open(self.conf_file, 'w')
                except IOError:
                        log.error("Couldn't write config file")
                else:
                        for channel in self.channels:
                                if channel in self.enabled_channels:
                                        f.write('channel=%s\n' % channel)
                                else:
                                        f.write('channel!%s\n' % channel)
                        f.close()
 
# Setup command line options
parser = OptionParser(version='%prog ' + str(VERSION))
parser.set_defaults(quiet=False, capabilities=False, debug=False)
parser.add_option('--quiet', action='store_true',
        help='be quiet, don\'t output status information.')
parser.add_option('--debug', action='store_true', dest='debug',
        help='output debugging information.')
parser.add_option('--capabilities', action='store_true',
        help='show this grabbers capabilities.')
parser.add_option('--configure', action='store_true',
        help='manually configure this grabber.')
parser.add_option('--config-file',
        help='Use configuration file CONFIG_FILE.')
parser.add_option('--description', action='store_true',
        help='show desciption of this grabber.')
parser.add_option('--preferredmethod', action='store_true',
        help='show the preferred download method of this grabber.')
parser.add_option('--days', type='int',
        help='supply data for DAYS days.')
parser.add_option('--offset', type='int',
        help='output data for day today plus OFFSET days.')
parser.add_option('--output',
        help='send output to file OUTPUT, the default is STDOUT.')
parser.add_option('--cache',
        help='cache XML data to file CACHE')
(options, args) = parser.parse_args()
 
if options.debug and options.quiet:
        parser.error('options --debug and --quiet are mutually exclusive')
 
if options.capabilities:
        print 'baseline'
        print 'manualconfig'
        print 'preferredmethod'
        print 'cache'
        sys.exit()
 
if options.description:
        print DESCRIPTION
        sys.exit()
 
if options.preferredmethod:
        print 'allatonce'
        sys.exit()
 
if options.config_file:
        config_file = options.config_file
else:
        config_dir = os.path.expanduser('~/.xmltv/')
        # Create config directory if it doesn't exist
        if not os.path.isdir(config_dir):
                try:
                        os.mkdir(config_dir)
                except:
                        log.critical('Failed to create config directory: %s' % config_dir)
                        sys.exit(2)
        config_file = os.path.join(config_dir, '%s.conf' % NAME)
 
# setup configuration
conf = XMLTVConfig(config_file)
 
if options.debug:
        ch.setLevel(logging.DEBUG)
 
if options.quiet:
        ch.setLevel(logging.CRITICAL)
 
if options.configure:
        available_channels = []
        new_channels = []
        new_enabled_channels = []
 
        text = getListings()
        log.info('Parsing channel data...')
        doc = ElementTree.parse(StringIO(text)).getroot()
 
        for element in doc:
                if element.tag == 'channel':
                        new_channels.append(element.get('id'))
                        available_channels.append((element.get('id'), element[0].text))
 
        log.info('Done (%s channels)' % len(available_channels))
        print
        print 'Please select the channels you wish to use for'
        print 'this source by pressing y or n when prompted:'
        print
        if conf.exists:
                log.warning('Config file already exists, abort (CTRL-C) if you wish to keep the current config')
        print
        for channel in available_channels:
                use = raw_input('Use channel %s (%s)? [y/N]' % (channel[1].encode( "utf-8" ), channel[0].encode( "utf-8" )))
                if use.lower() == 'y':
                        new_enabled_channels.append(channel[0])
        conf.channels = new_channels
        conf.enabled_channels = new_enabled_channels
        conf.write()
        sys.exit()
 
if not conf.exists:
        log.critical('Not configured! Perhaps you meant to run with --config-file or --configure?')
        sys.exit(2)
 
today = datetime.now().replace(hour=0, minute=0, second=0, microsecond=0)
 
if options.offset:
        offset = timedelta(days=options.offset)
        start_listings = today + offset
        log.debug('Showing listings from %s' % start_listings)
else:
        start_listings = today
 
if options.days:
        days = timedelta(days=options.days)
        end_listings = start_listings + days
        log.debug('Showing listings until %s' % end_listings)
else:
        end_listings = None
 
text = getListings(cache=options.cache)
 
if not text:
        log.critical('No listings data found!')
        sys.exit(2)
 
log.info('Parsing listings...')
doc = ElementTree.parse(StringIO(text)).getroot()
 
newdoc = ElementTree.Element('tv', doc.attrib)
 
for element in doc:
        if element.tag == 'channel' and element.get('id') in conf.enabled_channels:
                newdoc.append(element)
        if element.tag == 'programme' and element.get('channel') in conf.enabled_channels:
                # build datetime from start attribute of programme
                ### CHANGE 2007-08-19, hcvst@xmltv.info
                # The xmltv file as provided by xmltv.info does currently not contain any
                # timezone information, such as +0200. It should be added in the future.
                # The last six characters can only be removed (as is done in the original version
                # of this script) if the timezone info is present.   
                start_time = element.get('start')
                start_time_tz = ''
                if " " in start_time:
                    p = re.compile(' .*')
                    start_time_tz = p.search(start_time)
                    start_time = p.sub('', start_time)
		print start_time
                programme_start = datetime.fromtimestamp(
                        time.mktime(
                                time.strptime(start_time, '%Y%m%d%H%M%S')
                        )
                )
 		if int(start_time) > 20100000000000:
			break
                # Fix the Start time of a showing as it may be false
                programme_start = programme_start + timedelta(hours=HOUR_OFFSET)
                element.set('start', programme_start.strftime('%Y%m%d%H%M%S'))
 
                # Fix the End time of a showing
                end_time = element.get('stop')
                end_time_tz = ''
                if " " in end_time:
                    p = re.compile(' .*')
                    end_time_tz = p.search(end_time)
                    end_time = p.sub('', end_time)
                programme_end = datetime.fromtimestamp(
                    time.mktime(
                        time.strptime(end_time, '%Y%m%d%H%M%S')
                    )
                )
                programme_end = programme_end + timedelta(hours=HOUR_OFFSET)
                element.set('stop', programme_end.strftime('%Y%m%d%H%M%S'))
 
 
                if programme_start > start_listings:
                        if end_listings:
                                if programme_start < end_listings:
                                        newdoc.append(element)
                        else:
                                newdoc.append(element)
 
output = ElementTree.tostring(newdoc)
 
log.info('Done')
 
if options.cache:
        open(options.cache, 'w').write(output)
 
if options.output:
        open(options.output, 'w').write(output)
else:
        print output