#!/usr/bin/env python2
# Author: Nic Wolfe <nic@wolfeden.ca>
# URL: http://code.google.com/p/sickbeard/
#
# This file is part of SickRage.
#
# SickRage 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.
#
# SickRage 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 SickRage.  If not, see <http://www.gnu.org/licenses/>.

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

import time
import sys
import shutil
import subprocess

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)

import os

sys.path.insert(0, 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 locale
import datetime
import threading
import signal
import traceback
import getopt

import sickbeard

from sickbeard import db
from sickbeard.tv import TVShow
from sickbeard import logger
from sickbeard.webserveInit import SRWebServer
from sickbeard.version import SICKBEARD_VERSION
from sickbeard.databases.mainDB import MIN_DB_VERSION
from sickbeard.databases.mainDB import MAX_DB_VERSION

from lib.configobj import ConfigObj

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

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

class SickRage(object):

    def __init__(self):
        self.webserver = None
        self.runAsDaemon = False
        self.CREATEPID = False
        self.PIDFILE = None
        self.forceUpdate = False
        self.forcedPort = None
        self.noLaunch = False

    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, "")
            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 SickRage folder to the PYTHONPATH environment variable'
            print 'or find another way to force Python to use ' + sickbeard.SYS_ENCODING + ' for string 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:], "qfdp::",
                                       ['quiet', 'forceupdate', 'daemon', 'port=', 'pidfile=', 'nolaunch', 'config=',
                                        'datadir='])  # @UnusedVariable
        except getopt.GetoptError:
            print "Available Options: --quiet, --forceupdate, --port, --daemon, --pidfile, --config, --datadir"
            sys.exit()

        for o, a in opts:
            # 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'):
                self.forcedPort = int(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

            # 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

            # 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: " + self.PIDFILE + " already exists. Exiting.")

        # 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("PID dir: " + pid_dir + " doesn't exist. Exiting.")
                if not os.access(pid_dir, os.W_OK):
                    sys.exit("PID dir: " + pid_dir + " must be writable (write permissions). Exiting.")

            else:
                if self.consoleLogging:
                    sys.stdout.write("Not running in daemon mode. PID file creation disabled.\n")

                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, 0744)
            except os.error, e:
                raise SystemExit("Unable to create datadir '" + sickbeard.DATA_DIR + "'")

        # Make sure we can write to the data dir
        if not os.access(sickbeard.DATA_DIR, os.W_OK):
            raise SystemExit("Datadir must be writeable '" + 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):
                raise SystemExit("Config file '" + sickbeard.CONFIG_FILE + "' must be writeable.")
            elif not os.access(os.path.dirname(sickbeard.CONFIG_FILE), os.W_OK):
                raise SystemExit(
                    "Config file root dir '" + os.path.dirname(sickbeard.CONFIG_FILE) + "' must be writeable.")

        # 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(u"Restore FAILED!", logger.ERROR)

        os.chdir(sickbeard.DATA_DIR)

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

        sickbeard.CFG = ConfigObj(sickbeard.CONFIG_FILE)

        CUR_DB_VERSION = db.DBConnection().checkDBVersion()

        if CUR_DB_VERSION > 0:
            if CUR_DB_VERSION < MIN_DB_VERSION:
                raise SystemExit("Your database version (" + str(
                    CUR_DB_VERSION) + ") is too old to migrate from with this version of SickRage (" + str(
                    MIN_DB_VERSION) + ").\n" + \
                                 "Upgrade using a previous version of SB first, or start with no database file to begin fresh.")
            if CUR_DB_VERSION > MAX_DB_VERSION:
                raise SystemExit("Your database version (" + str(
                    CUR_DB_VERSION) + ") has been incremented past what this version of SickRage supports (" + str(
                    MAX_DB_VERSION) + ").\n" + \
                                 "If you have used other forks of SB, 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 " + str(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': sickbeard.HTTPS_CERT,
            'https_key': sickbeard.HTTPS_KEY,
        }

        # start web server
        try:
            self.webserver = SRWebServer(self.web_options)
            self.webserver.start()
        except IOError:
            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)

        if self.consoleLogging:
            print "Starting up SickRage " + SICKBEARD_VERSION + " from " + sickbeard.CONFIG_FILE

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

        # Fire up all our threads
        sickbeard.start()

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

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

        while(sickbeard.started):
            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, 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, 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: " + pid + " to " + str(self.PIDFILE))
            try:
                file(self.PIDFILE, 'w').write("%s\n" % pid)
            except IOError, e:
                logger.log_error_and_exit(
                    u"Unable to write PID file: " + self.PIDFILE + " Error: " + str(e.strerror) + " [" + str(
                        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())

    def remove_pid_file(self, PIDFILE):
        try:
            if os.path.exists(PIDFILE):
                os.remove(PIDFILE)

        except (IOError, OSError):
            return False

        return True

    def loadShowsFromDB(self):
        """
        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"]))
                sickbeard.showList.append(curShow)
            except Exception, e:
                logger.log(
                    u"There was an error creating the show in " + sqlShow["location"] + ": " + str(e).decode('utf-8'),
                    logger.ERROR)
                logger.log(traceback.format_exc(), logger.DEBUG)

    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

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

    sr = None
    try:
        # init sickrage
        sr = SickRage()

        # start sickrage
        sr.start()

        # shutdown web server
        sr.webserver.shutDown()
        sr.webserver.join()
        sr.webserver = None

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

        if not sickbeard.shutdown:
            install_type = sickbeard.versionCheckScheduler.action.install_type

            popen_list = []

            if install_type in ('git', 'source'):
                popen_list = [sys.executable, sickbeard.MY_FULLNAME]
            elif install_type == 'win':
                if hasattr(sys, 'frozen'):
                    # c:\dir\to\updater.exe 12345 c:\dir\to\sickbeard.exe
                    popen_list = [os.path.join(sickbeard.PROG_DIR, 'updater.exe'), str(sickbeard.PID), sys.executable]
                else:
                    logger.log(u"Unknown SB launch method, please file a bug report about this", logger.ERROR)
                    popen_list = [sys.executable, os.path.join(sickbeard.PROG_DIR, 'updater.py'), str(sickbeard.PID), 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 SickRage with " + str(popen_list))
                logger.close()
                subprocess.Popen(popen_list, cwd=os.getcwd())

        # exit process
        os._exit(0)
    except:
        if sr:
            logger.log(traceback.format_exc(), logger.ERROR)
        else:
            print(traceback.format_exc())
        sys.exit(1)