# pylama:ignore=E722
"""
MIT License

Copyright (C) 2023 ROCKY4546
https://github.com/rocky4546

This file is part of Cabernet

Permission is hereby granted, free of charge, to any person obtaining a copy of this software
and associated documentation files (the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge, publish, distribute,
sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or
substantial portions of the Software.
"""

import traceback
import datetime
import errno
import logging
import re
import xml.dom.minidom as minidom
from xml.etree import ElementTree

import lib.common.utils as utils
import lib.tvheadend.epg_category as epg_category
from lib.common.decorators import getrequest
from lib.db.db_channels import DBChannels
from lib.db.db_epg import DBepg
from lib.web.pages.templates import web_templates


@getrequest.route('/xmltv.xml')
def xmltv_xml(_webserver):
    try:
        epg = EPG(_webserver)
        epg.get_epg_xml(_webserver)
    except MemoryError as e:
        _webserver.do_mime_response(
            501, 'text/html',
            web_templates['htmlError'].format('501 - MemoryError: {}'.format(e)))


class EPG:
    # https://github.com/XMLTV/xmltv/blob/master/xmltv.dtd
    def __init__(self, _webserver):
        self.logger = logging.getLogger(__name__)
        self.webserver = _webserver
        self.config = _webserver.plugins.config_obj.data
        self.epg_db = DBepg(self.config)
        self.channels_db = DBChannels(self.config)
        self.plugins = _webserver.plugins
        self.namespace = _webserver.query_data['name']
        self.instance = _webserver.query_data['instance']
        self.tv_tag = False
        self.today = datetime.datetime.utcnow().date()
        self.prog_processed = []

    def get_next_epg_day(self):
        is_enabled = False
        day_data = None
        ns = None
        inst = None
        day = None
        while not is_enabled:
            day_data, ns, inst, day = self.epg_db.get_next_row()
            if day_data is None:
                break
            if day < self.today:
                continue
            config_section = utils.instance_config_section(ns, inst)
            
            if not self.config.get(ns.lower()) \
                    or not self.config[ns.lower()]['enabled'] \
                    or not self.config.get(config_section) \
                    or not self.config[config_section]['enabled'] \
                    or not self.config[config_section].get('epg-enabled'):
                continue
            is_enabled = True
        return day_data, ns, inst, day

    def get_epg_xml(self, _webserver):
        xml_out = None
        
        if self.namespace is not None \
                and not self.plugins.plugins.get(self.namespace):
            _webserver.do_mime_response(
                501, 'text/html',
                web_templates['htmlError'].format('501 - Invalid Namespace: {}'.format(self.namespace)))
            return

        try:
            _webserver.do_dict_response({
                'code': 200,
                'headers': {'Content-type': 'application/xml; Transfer-Encoding: chunked'},
                'text': None})
            xml_out = self.gen_header_xml()
            channel_list = self.channels_db.get_channels(self.namespace, self.instance)
            self.gen_channel_xml(xml_out, channel_list)
            self.write_xml(xml_out, keep_xml_prolog=True)
            xml_out = None

            self.epg_db.init_get_query(self.namespace, self.instance)

            day_data, ns, inst, day = self.get_next_epg_day()
            self.logger.debug('Processing EPG data {}:{} {}'
                              .format(ns, inst, day))
            self.prog_processed = []
            while day_data:
                xml_out = EPG.gen_minimal_header_xml()
                self.gen_program_xml(xml_out, day_data, channel_list, ns, inst)
                self.write_xml(xml_out)
                xml_out.clear()
                day_data, ns, inst, day = self.get_next_epg_day()
                self.logger.debug('Processing EPG data {}:{} {}'
                                  .format(ns, inst, day))
            day_data = None
            self.epg_db.close_query()
            self.webserver.wfile.write(b'</tv>\r\n')
            self.webserver.wfile.flush()
        except MemoryError as e:
            self.logger.error('MemoryError parsing large xml')
            raise e
        except IOError as ex:
            # Check we hit a broken pipe when trying to write back to the client
            if ex.errno in [errno.EPIPE, errno.ECONNABORTED, errno.ECONNRESET, errno.ECONNREFUSED]:
                # Normal process.  Client request end of stream
                self.logger.info('Connection dropped by client {}'
                                 .format(ex))
                xml_out.clear()
                return
            else:
                self.logger.error('{}{}'.format(
                    'UNEXPECTED EXCEPTION=', ex))
                raise

        xml_out = None   # clear to help garbage collection

    def write_xml(self, _xml, keep_xml_prolog=False):
        if self.config['epg']['epg_prettyprint']:
            if not keep_xml_prolog:
                epg_dom = minidom.parseString(ElementTree.tostring(_xml, encoding='UTF-8', method='xml')).toprettyxml()
                if epg_dom.endswith('</tv>\n'):
                    epg_dom = epg_dom.replace('<?xml version="1.0" ?>\n<tv>', '', 1)
                    epg_dom = epg_dom.replace('</tv>', '', 1)
                else:
                    epg_dom = ''
            else:
                epg_dom = minidom.parseString(ElementTree.tostring(_xml, encoding='UTF-8', method='xml')).toprettyxml()
                epg_dom = epg_dom.replace('<?xml version="1.0" ?>\n','<?xml version="1.0" encoding="UTF-8"?>\n<!DOCTYPE tv SYSTEM "xmltv.dtd">\n',1) 
                if epg_dom.endswith('</tv>\n'):
                    epg_dom = re.sub('</tv>\n$', '', epg_dom)
                else:
                    epg_dom = re.sub('"/>\n$', '">', epg_dom)
            self.webserver.wfile.write(epg_dom.encode())
        else:
            if not keep_xml_prolog:
                epg_dom = ElementTree.tostring(_xml)
                if epg_dom.endswith(b'<tv />'):
                    epg_dom = b''
                else:
                    epg_dom = epg_dom.replace(b'<tv>', b'', 1)
                    epg_dom = epg_dom.replace(b'</tv>', b'', 1)
            else:
                epg_dom = b'<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE tv SYSTEM "xmltv.dtd">'
                epg_dom = epg_dom + ElementTree.tostring(_xml)
                if epg_dom.endswith(b'</tv>'):
                    epg_dom = re.sub(b'</tv>$', b'', epg_dom)
                else:
                    epg_dom = re.sub(b'" />$', b'">', epg_dom)
            self.webserver.wfile.write(epg_dom + b'\r\n')
        epg_dom = None      # clear to help garbage collection
        return True

    def gen_channel_xml(self, _et_root, _channel_list):
        sids_processed = []
        for sid, sid_data_list in _channel_list.items():
            if sid in sids_processed:
                continue
            sids_processed.append(sid)
            for ch_data in sid_data_list:
                if not ch_data['enabled']:
                    continue
                config_section = utils.instance_config_section(ch_data['namespace'], ch_data['instance'])
                if not self.config.get(ch_data['namespace'].lower()) \
                        or not self.config[ch_data['namespace'].lower()]['enabled'] \
                        or not self.config.get(config_section) \
                        or not self.config[config_section]['enabled'] \
                        or not self.config[config_section].get('epg-enabled'):
                    continue

                updated_chnum = utils.wrap_chnum(
                    ch_data['display_number'], ch_data['namespace'],
                    ch_data['instance'], self.config)
                if self.config['epg'].get('epg_add_plugin_to_channel_id'):
                    ch_ref = ch_data['namespace'] + '-'
                else:
                    ch_ref = ''
                if self.config['epg'].get('epg_use_channel_number'):
                    ch_ref += updated_chnum
                else:
                    ch_ref += sid
                c_out = EPG.sub_el(_et_root, 'channel', id=ch_ref)

                EPG.sub_el(c_out, 'display-name', _text='%s %s' %
                    (updated_chnum, ch_data['display_name']))
                EPG.sub_el(c_out, 'display-name', _text=ch_data['display_name'])
                EPG.sub_el(c_out, 'display-name', _text=ch_data['json']['callsign'])
                EPG.sub_el(c_out, 'display-name', _text='%s %s' %
                    (updated_chnum, ch_data['json']['callsign']))
                EPG.sub_el(c_out, 'lcn', _text='%s' %
                    (updated_chnum))
                if self.config['epg']['epg_channel_icon'] and ch_data['thumbnail'] is not None:
                    EPG.sub_el(c_out, 'icon', src=ch_data['thumbnail'])
                break
        return _et_root

    def gen_program_xml(self, _et_root, _prog_list, _channel_list, _ns, _inst):

        for prog_data in _prog_list:
            proginfo = prog_data['start'] + prog_data['channel']
            if proginfo in self.prog_processed:
                continue
            skip = False
            try:
                for ch_data in _channel_list[prog_data['channel']]:
                    if ch_data['namespace'] == _ns \
                            and ch_data['instance'] == _inst:
                        if not ch_data['enabled']:
                            skip = True
                            break
                        config_section = utils.instance_config_section(ch_data['namespace'], ch_data['instance'])
                        if not self.config[ch_data['namespace'].lower()]['enabled']:
                            skip = True
                            break
                        if not self.config[config_section]['enabled']:
                            skip = True
                            break
                        if not self.config[config_section]['epg-enabled']:
                            skip = True
                            break
            except KeyError as ex:
                skip = True
            
            if skip:
                continue
            self.prog_processed.append(proginfo)

            if self.config['epg'].get('epg_add_plugin_to_channel_id'):
                ch_ref = ch_data['namespace'] + '-'
            else:
                ch_ref = ''
            if self.config['epg'].get('epg_use_channel_number'):
                ch_data = _channel_list[prog_data['channel']][0]
                updated_chnum = utils.wrap_chnum(
                    ch_data['display_number'], ch_data['namespace'],
                    ch_data['instance'], self.config)
                ch_ref += updated_chnum
            else:
                ch_ref += prog_data['channel']
            prog_out = EPG.sub_el(_et_root, 'programme',
                                  start=prog_data['start'],
                                  stop=prog_data['stop'],
                                  channel=ch_ref)
            if prog_data['title']:
                EPG.sub_el(prog_out, 'title', lang='en', _text=prog_data['title'])
            if prog_data['subtitle']:
                EPG.sub_el(prog_out, 'sub-title', lang='en', _text=prog_data['subtitle'])
            descr_add = ''
            if self.config['epg']['description'] == 'extend':
                if prog_data['formatted_date']:
                    descr_add += '(' + prog_data['formatted_date'] + ') '
                if prog_data['genres']:
                    descr_add += ' / '.join(prog_data['genres']) + ' / '
                if prog_data['se_common']:
                    descr_add += prog_data['se_common']
                elif prog_data['episode']:
                    descr_add += 'E' + str(prog_data['episode'])
                descr_add += '\n' + prog_data['desc']
            elif self.config['epg']['description'] == 'brief':
                descr_add = prog_data['short_desc']
            elif self.config['epg']['description'] == 'normal':
                descr_add = prog_data['desc']
            else:
                self.logger.warning('Config value [epg][description] is invalid: '
                                    + self.config['epg']['description'])
            EPG.sub_el(prog_out, 'desc', lang='en', _text=descr_add)

            if prog_data['video_quality']:
                video_out = EPG.sub_el(prog_out, 'video')
                EPG.sub_el(video_out, 'quality', prog_data['video_quality'])

            if prog_data['air_date']:
                EPG.sub_el(prog_out, 'date',
                           _text=prog_data['air_date'])

            EPG.sub_el(prog_out, 'length', units='minutes', _text=str(prog_data['length']))

            if prog_data['genres']:
                for f in prog_data['genres']:
                    if self.config['epg']['genre'] == 'normal':
                        pass
                    elif self.config['epg']['genre'] == 'tvheadend':
                        if f in epg_category.TVHEADEND.keys():
                            f = epg_category.TVHEADEND[f]
                    else:
                        self.logger.warning('Config value [epg][genre] is invalid: '
                                            + self.config['epg']['genre'])
                    EPG.sub_el(prog_out, 'category', lang='en', _text=f.strip())

            if prog_data['icon'] and self.config['epg']['epg_program_icon']:
                EPG.sub_el(prog_out, 'icon', src=prog_data['icon'])

            if prog_data['actors'] or prog_data['directors']:
                r = ElementTree.SubElement(prog_out, 'credits')
                if prog_data['directors']:
                    for actor in prog_data['directors']:
                        EPG.sub_el(r, 'director', _text=actor)
                if prog_data['actors']:
                    for actor in prog_data['actors']:
                        EPG.sub_el(r, 'actor', _text=actor)

            if prog_data['rating']:
                r = ElementTree.SubElement(prog_out, 'rating')
                EPG.sub_el(r, 'value', _text=prog_data['rating'])

            if prog_data['se_common']:
                EPG.sub_el(prog_out, 'episode-num', system='common',
                           _text=prog_data['se_common'])
                EPG.sub_el(prog_out, 'episode-num', system='SxxExx',
                           _text=prog_data['se_common'])
            if prog_data['se_progid']:
                EPG.sub_el(prog_out, 'episode-num', system='dd_progid',
                           _text=prog_data['se_progid'])
            if prog_data['se_xmltv_ns']:
                EPG.sub_el(prog_out, 'episode-num', system='xmltv_ns',
                           _text=prog_data['se_xmltv_ns'])
            if prog_data['is_new']:
                EPG.sub_el(prog_out, 'new')
            else:
                EPG.sub_el(prog_out, 'previously-shown')
            if prog_data['cc']:
                EPG.sub_el(prog_out, 'subtitles', type='teletext')
            if prog_data['premiere']:
                EPG.sub_el(prog_out, 'premiere')

    def gen_header_xml(self):
        if self.namespace is None:
            website = utils.CABERNET_URL
            name = utils.CABERNET_ID
        else:
            website = self.plugins.plugins[self.namespace].plugin_settings['website']
            name = self.plugins.plugins[self.namespace].plugin_settings['name']

        xml_out = ElementTree.Element('!DOCTYPE')
        xml_out = ElementTree.Element('tv')
        xml_out.set('source-info-url', website)
        xml_out.set('source-info-name', name)
        xml_out.set('generator-info-name', utils.CABERNET_ID)
        xml_out.set('generator-info-url', utils.CABERNET_URL)
        return xml_out

    @staticmethod
    def gen_minimal_header_xml():
        return ElementTree.Element('tv')

    @staticmethod
    def sub_el(_parent, _name, _text=None, **kwargs):
        el = ElementTree.SubElement(_parent, _name, **kwargs)
        if _text:
            el.text = _text
        return el