#!/usr/bin/env python2
# Author: Nic Wolfe <nic@wolfeden.ca>
# URL: http://code.google.com/p/sickbeard/
#
# This file is part of SickGear.
#
# SickGear is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# SickGear is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with SickGear.  If not, see <http://www.gnu.org/licenses/>.

# Check needed software dependencies to nudge users to fix their setup
from __future__ import print_function
from __future__ import with_statement

import time
import signal
import sys
import shutil
import subprocess
import os
import locale
import datetime
import threading
import getopt

if sys.version_info < (2, 6):
    print('Sorry, requires Python 2.6 or 2.7.')
    sys.exit(1)

try:
    import Cheetah

    if Cheetah.Version[0] != '2':
        raise ValueError
except ValueError:
    print('Sorry, requires Python module Cheetah 2.1.0 or newer.')
    sys.exit(1)
except:
    print('The Python module Cheetah is required')
    sys.exit(1)

sys.path.insert(1, os.path.abspath(os.path.join(os.path.dirname(__file__), 'lib')))

# We only need this for compiling an EXE and I will just always do that on 2.6+
if sys.hexversion >= 0x020600F0:
    from multiprocessing import freeze_support  # @UnresolvedImport

import sickbeard
from sickbeard import db, logger, network_timezones, failed_history, name_cache
from sickbeard.tv import TVShow
from sickbeard.webserveInit import WebServer
from sickbeard.databases.mainDB import MIN_DB_VERSION, MAX_DB_VERSION
from sickbeard.event_queue import Events
from lib.configobj import ConfigObj

throwaway = datetime.datetime.strptime('20110101', '%Y%m%d')

signal.signal(signal.SIGINT, sickbeard.sig_handler)
signal.signal(signal.SIGTERM, sickbeard.sig_handler)


class SickGear(object):
    def __init__(self):
        # system event callback for shutdown/restart
        sickbeard.events = Events(self.shutdown)

        # daemon constants
        self.runAsDaemon = False
        self.CREATEPID = False
        self.PIDFILE = ''

        # webserver constants
        self.webserver = None
        self.forceUpdate = False
        self.forcedPort = None
        self.noLaunch = False

    @staticmethod
    def help_message():
        """
        print help message for commandline options
        """
        help_msg = '\n'
        help_msg += 'Usage: %s <option> <another option>\n' % sickbeard.MY_FULLNAME
        help_msg += '\n'
        help_msg += 'Options:\n'
        help_msg += '\n'
        help_msg += '    -h          --help              Prints this message\n'
        help_msg += '    -f          --forceupdate       Force update all shows in the DB (from tvdb) on startup\n'
        help_msg += '    -q          --quiet             Disables logging to console\n'
        help_msg += '                --nolaunch          Suppress launching web browser on startup\n'

        if sys.platform == 'win32':
            help_msg += '    -d          --daemon            Running as real daemon is not supported on Windows\n'
            help_msg += '                                    On Windows, --daemon is substituted with: --quiet --nolaunch\n'
        else:
            help_msg += '    -d          --daemon            Run as double forked daemon (includes options --quiet --nolaunch)\n'
            help_msg += '                --pidfile=<path>    Combined with --daemon creates a pidfile (full path including filename)\n'

        help_msg += '    -p <port>   --port=<port>       Override default/configured port to listen on\n'
        help_msg += '                --datadir=<path>    Override folder (full path) as location for\n'
        help_msg += '                                    storing database, configfile, cache, logfiles \n'
        help_msg += '                                    Default: %s\n' % sickbeard.PROG_DIR
        help_msg += '                --config=<path>     Override config filename (full path including filename)\n'
        help_msg += '                                    to load configuration from \n'
        help_msg += '                                    Default: config.ini in %s or --datadir location\n' % sickbeard.PROG_DIR
        help_msg += '                --noresize          Prevent resizing of the banner/posters even if PIL is installed\n'

        return help_msg

    def start(self):
        # do some preliminary stuff
        sickbeard.MY_FULLNAME = os.path.normpath(os.path.abspath(__file__))
        sickbeard.MY_NAME = os.path.basename(sickbeard.MY_FULLNAME)
        sickbeard.PROG_DIR = os.path.dirname(sickbeard.MY_FULLNAME)
        sickbeard.DATA_DIR = sickbeard.PROG_DIR
        sickbeard.MY_ARGS = sys.argv[1:]
        sickbeard.SYS_ENCODING = None

        try:
            locale.setlocale(locale.LC_ALL, '')
        except (locale.Error, IOError):
            pass
        try:
            sickbeard.SYS_ENCODING = locale.getpreferredencoding()
        except (locale.Error, IOError):
            pass

        # For OSes that are poorly configured I'll just randomly force UTF-8
        if not sickbeard.SYS_ENCODING or sickbeard.SYS_ENCODING in ('ANSI_X3.4-1968', 'US-ASCII', 'ASCII'):
            sickbeard.SYS_ENCODING = 'UTF-8'

        if not hasattr(sys, 'setdefaultencoding'):
            reload(sys)

        try:
            # pylint: disable=E1101
            # On non-unicode builds this will raise an AttributeError, if encoding type is not valid it throws a LookupError
            sys.setdefaultencoding(sickbeard.SYS_ENCODING)
        except:
            print('Sorry, you MUST add the SickGear folder to the PYTHONPATH environment variable')
            print('or find another way to force Python to use %s for string encoding.' % sickbeard.SYS_ENCODING)
            sys.exit(1)

        # Need console logging for SickBeard.py and SickBeard-console.exe
        self.consoleLogging = (not hasattr(sys, 'frozen')) or (sickbeard.MY_NAME.lower().find('-console') > 0)

        # Rename the main thread
        threading.currentThread().name = 'MAIN'

        try:
            opts, args = getopt.getopt(sys.argv[1:], 'hfqdp::',
                                       ['help', 'forceupdate', 'quiet', 'nolaunch', 'daemon', 'pidfile=', 'port=',
                                        'datadir=', 'config=', 'noresize'])  # @UnusedVariable
        except getopt.GetoptError:
            sys.exit(self.help_message())

        for o, a in opts:
            # Prints help message
            if o in ('-h', '--help'):
                sys.exit(self.help_message())

            # For now we'll just silence the logging
            if o in ('-q', '--quiet'):
                self.consoleLogging = False

            # Should we update (from indexer) all shows in the DB right away?
            if o in ('-f', '--forceupdate'):
                self.forceUpdate = True

            # Suppress launching web browser
            # Needed for OSes without default browser assigned
            # Prevent duplicate browser window when restarting in the app
            if o in ('--nolaunch',):
                self.noLaunch = True

            # Override default/configured port
            if o in ('-p', '--port'):
                try:
                    self.forcedPort = int(a)
                except ValueError:
                    sys.exit('Port: %s is not a number. Exiting.' % a)

            # Run as a double forked daemon
            if o in ('-d', '--daemon'):
                self.runAsDaemon = True
                # When running as daemon disable consoleLogging and don't start browser
                self.consoleLogging = False
                self.noLaunch = True

                if sys.platform == 'win32':
                    self.runAsDaemon = False

            # Write a pidfile if requested
            if o in ('--pidfile',):
                self.CREATEPID = True
                self.PIDFILE = str(a)

                # If the pidfile already exists, sickbeard may still be running, so exit
                if os.path.exists(self.PIDFILE):
                    sys.exit('PID file: %s already exists. Exiting.' % self.PIDFILE)

            # Specify folder to load the config file from
            if o in ('--config',):
                sickbeard.CONFIG_FILE = os.path.abspath(a)

            # Specify folder to use as the data dir
            if o in ('--datadir',):
                sickbeard.DATA_DIR = os.path.abspath(a)

            # Prevent resizing of the banner/posters even if PIL is installed
            if o in ('--noresize',):
                sickbeard.NO_RESIZE = True

        # The pidfile is only useful in daemon mode, make sure we can write the file properly
        if self.CREATEPID:
            if self.runAsDaemon:
                pid_dir = os.path.dirname(self.PIDFILE)
                if not os.access(pid_dir, os.F_OK):
                    sys.exit(u"PID dir: %s doesn't exist. Exiting." % pid_dir)
                if not os.access(pid_dir, os.W_OK):
                    sys.exit(u'PID dir: %s must be writable (write permissions). Exiting.' % pid_dir)

            else:
                if self.consoleLogging:
                    print(u'Not running in daemon mode. PID file creation disabled')

                self.CREATEPID = False

        # If they don't specify a config file then put it in the data dir
        if not sickbeard.CONFIG_FILE:
            sickbeard.CONFIG_FILE = os.path.join(sickbeard.DATA_DIR, 'config.ini')

        # Make sure that we can create the data dir
        if not os.access(sickbeard.DATA_DIR, os.F_OK):
            try:
                os.makedirs(sickbeard.DATA_DIR, 0o744)
            except os.error:
                sys.exit(u'Unable to create data directory: %s Exiting.' % sickbeard.DATA_DIR)

        # Make sure we can write to the data dir
        if not os.access(sickbeard.DATA_DIR, os.W_OK):
            sys.exit(u'Data directory: %s must be writable (write permissions). Exiting.' % sickbeard.DATA_DIR)

        # Make sure we can write to the config file
        if not os.access(sickbeard.CONFIG_FILE, os.W_OK):
            if os.path.isfile(sickbeard.CONFIG_FILE):
                sys.exit(u'Config file: %s must be writeable (write permissions). Exiting.' % sickbeard.CONFIG_FILE)
            elif not os.access(os.path.dirname(sickbeard.CONFIG_FILE), os.W_OK):
                sys.exit(u'Config file directory: %s must be writeable (write permissions). Exiting'
                         % os.path.dirname(sickbeard.CONFIG_FILE))
        os.chdir(sickbeard.DATA_DIR)

        if self.consoleLogging:
            print(u'Starting up SickGear from %s' % sickbeard.CONFIG_FILE)

        # Load the config and publish it to the sickbeard package
        if not os.path.isfile(sickbeard.CONFIG_FILE):
            print(u'Unable to find "%s", all settings will be default!' % sickbeard.CONFIG_FILE)

        sickbeard.CFG = ConfigObj(sickbeard.CONFIG_FILE)

        CUR_DB_VERSION = db.DBConnection().checkDBVersion()

        if CUR_DB_VERSION > 0:
            if CUR_DB_VERSION < MIN_DB_VERSION:
                print(u'Your database version (%s) is too old to migrate from with this version of SickGear' \
                      % CUR_DB_VERSION)
                sys.exit(u'Upgrade using a previous version of SG first, or start with no database file to begin fresh')
            if CUR_DB_VERSION > MAX_DB_VERSION:
                print(u'Your database version (%s) has been incremented past what this version of SickGear supports' \
                      % CUR_DB_VERSION)
                sys.exit(
                    u'If you have used other forks of SG, your database may be unusable due to their modifications')

        # Initialize the config and our threads
        sickbeard.initialize(consoleLogging=self.consoleLogging)

        if self.runAsDaemon:
            self.daemonize()

        # Get PID
        sickbeard.PID = os.getpid()

        if self.forcedPort:
            logger.log(u'Forcing web server to port %s' % self.forcedPort)
            self.startPort = self.forcedPort
        else:
            self.startPort = sickbeard.WEB_PORT

        if sickbeard.WEB_LOG:
            self.log_dir = sickbeard.LOG_DIR
        else:
            self.log_dir = None

        # sickbeard.WEB_HOST is available as a configuration value in various
        # places but is not configurable. It is supported here for historic reasons.
        if sickbeard.WEB_HOST and sickbeard.WEB_HOST != '0.0.0.0':
            self.webhost = sickbeard.WEB_HOST
        else:
            if sickbeard.WEB_IPV6:
                self.webhost = '::'
            else:
                self.webhost = '0.0.0.0'

        # web server options
        self.web_options = {
            'port': int(self.startPort),
            'host': self.webhost,
            'data_root': os.path.join(sickbeard.PROG_DIR, 'gui', sickbeard.GUI_NAME),
            'web_root': sickbeard.WEB_ROOT,
            'log_dir': self.log_dir,
            'username': sickbeard.WEB_USERNAME,
            'password': sickbeard.WEB_PASSWORD,
            'enable_https': sickbeard.ENABLE_HTTPS,
            'handle_reverse_proxy': sickbeard.HANDLE_REVERSE_PROXY,
            'https_cert': os.path.join(sickbeard.PROG_DIR, sickbeard.HTTPS_CERT),
            'https_key': os.path.join(sickbeard.PROG_DIR, sickbeard.HTTPS_KEY),
        }

        # start web server
        try:
            # used to check if existing SG instances have been started
            sickbeard.helpers.wait_for_free_port(self.web_options['host'], self.web_options['port'])

            self.webserver = WebServer(self.web_options)
            self.webserver.start()
        except Exception:
            logger.log(u'Unable to start web server, is something else running on port %d?' % self.startPort,
                       logger.ERROR)
            if sickbeard.LAUNCH_BROWSER and not self.runAsDaemon:
                logger.log(u'Launching browser and exiting', logger.ERROR)
                sickbeard.launchBrowser(self.startPort)
            os._exit(1)

        # Check if we need to perform a restore first
        restoreDir = os.path.join(sickbeard.DATA_DIR, 'restore')
        if os.path.exists(restoreDir):
            if self.restore(restoreDir, sickbeard.DATA_DIR):
                logger.log(u'Restore successful...')
            else:
                logger.log_error_and_exit(u'Restore FAILED!')

        # Build from the DB to start with
        self.loadShowsFromDB()

        # Fire up all our threads
        sickbeard.start()

        # Build internal name cache
        name_cache.buildNameCache()

        # refresh network timezones
        network_timezones.update_network_dict()

        # sure, why not?
        if sickbeard.USE_FAILED_DOWNLOADS:
            failed_history.trimHistory()

        # Start an update if we're supposed to
        if self.forceUpdate or sickbeard.UPDATE_SHOWS_ON_START:
            sickbeard.showUpdateScheduler.action.run(force=True)  # @UndefinedVariable

        # Launch browser
        if sickbeard.LAUNCH_BROWSER and not (self.noLaunch or self.runAsDaemon):
            sickbeard.launchBrowser(self.startPort)

        # main loop
        while True:
            time.sleep(1)

    def daemonize(self):
        """
        Fork off as a daemon
        """
        # pylint: disable=E1101
        # Make a non-session-leader child process
        try:
            pid = os.fork()  # @UndefinedVariable - only available in UNIX
            if pid != 0:
                os._exit(0)
        except OSError as e:
            sys.stderr.write('fork #1 failed: %d (%s)\n' % (e.errno, e.strerror))
            sys.exit(1)

        os.setsid()  # @UndefinedVariable - only available in UNIX

        # Make sure I can read my own files and shut out others
        prev = os.umask(0)
        os.umask(prev and int('077', 8))

        # Make the child a session-leader by detaching from the terminal
        try:
            pid = os.fork()  # @UndefinedVariable - only available in UNIX
            if pid != 0:
                os._exit(0)
        except OSError as e:
            sys.stderr.write('fork #2 failed: %d (%s)\n' % (e.errno, e.strerror))
            sys.exit(1)

        # Write pid
        if self.CREATEPID:
            pid = str(os.getpid())
            logger.log(u'Writing PID: %s to %s' % (pid, self.PIDFILE))
            try:
                file(self.PIDFILE, 'w').write('%s\n' % pid)
            except IOError as e:
                logger.log_error_and_exit(
                    u'Unable to write PID file: %s Error: %s [%s]' % (self.PIDFILE, e.strerror, e.errno))

        # Redirect all output
        sys.stdout.flush()
        sys.stderr.flush()

        devnull = getattr(os, 'devnull', '/dev/null')
        stdin = file(devnull, 'r')
        stdout = file(devnull, 'a+')
        stderr = file(devnull, 'a+')
        os.dup2(stdin.fileno(), sys.stdin.fileno())
        os.dup2(stdout.fileno(), sys.stdout.fileno())
        os.dup2(stderr.fileno(), sys.stderr.fileno())

    @staticmethod
    def remove_pid_file(PIDFILE):
        try:
            if os.path.exists(PIDFILE):
                os.remove(PIDFILE)

        except (IOError, OSError):
            return False

        return True

    @staticmethod
    def loadShowsFromDB():
        """
        Populates the showList with shows from the database
        """

        logger.log(u'Loading initial show list')

        myDB = db.DBConnection()
        sqlResults = myDB.select('SELECT * FROM tv_shows')

        sickbeard.showList = []
        for sqlShow in sqlResults:
            try:
                curShow = TVShow(int(sqlShow['indexer']), int(sqlShow['indexer_id']))
                curShow.nextEpisode()
                sickbeard.showList.append(curShow)
            except Exception as e:
                logger.log(
                    u'There was an error creating the show in %s: %s' % (sqlShow['location'], str(e).decode('utf-8',
                                                                                                            'replace')),
                    logger.ERROR)

    def restore(self, srcDir, dstDir):
        try:
            for file in os.listdir(srcDir):
                srcFile = os.path.join(srcDir, file)
                dstFile = os.path.join(dstDir, file)
                bakFile = os.path.join(dstDir, file + '.bak')
                shutil.move(dstFile, bakFile)
                shutil.move(srcFile, dstFile)

            os.rmdir(srcDir)
            return True
        except:
            return False

    def shutdown(self, type):
        if sickbeard.started:
            # stop all tasks
            sickbeard.halt()

            # save all shows to DB
            sickbeard.saveAll()

            # shutdown web server
            if self.webserver:
                logger.log('Shutting down Tornado')
                self.webserver.shutDown()
                try:
                    self.webserver.join(10)
                except:
                    pass

            # if run as daemon delete the pidfile
            if self.runAsDaemon and self.CREATEPID:
                self.remove_pid_file(self.PIDFILE)

            if type == sickbeard.events.SystemEvent.RESTART:
                install_type = sickbeard.versionCheckScheduler.action.install_type

                popen_list = []

                if install_type in ('git', 'source'):
                    popen_list = [sys.executable, sickbeard.MY_FULLNAME]

                if popen_list:
                    popen_list += sickbeard.MY_ARGS
                    if '--nolaunch' not in popen_list:
                        popen_list += ['--nolaunch']
                    logger.log(u'Restarting SickGear with %s' % popen_list)
                    logger.close()
                    subprocess.Popen(popen_list, cwd=os.getcwd())

        # system exit
        os._exit(0)


if __name__ == '__main__':
    if sys.hexversion >= 0x020600F0:
        freeze_support()

    # start SickGear
    SickGear().start()