# This file is part of PlexPy.
#
#  PlexPy 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.
#
#  PlexPy 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 PlexPy.  If not, see <http://www.gnu.org/licenses/>.

# NZBGet support added by CurlyMo <curlymoo1@gmail.com> as a part of
# XBian - XBMC on the Raspberry Pi

import os
import sys
import subprocess
import threading
import webbrowser
import sqlite3
import cherrypy
import datetime
import uuid

from apscheduler.schedulers.background import BackgroundScheduler
from apscheduler.triggers.interval import IntervalTrigger

from plexpy import versioncheck, logger, monitor, plextv
import plexpy.config

PROG_DIR = None
FULL_PATH = None

ARGS = None
SIGNAL = None

SYS_PLATFORM = None
SYS_ENCODING = None

QUIET = False
VERBOSE = True
DAEMON = False
CREATEPID = False
PIDFILE = None

SCHED = BackgroundScheduler()
SCHED_LOCK = threading.Lock()

INIT_LOCK = threading.Lock()
_INITIALIZED = False
started = False

DATA_DIR = None

CONFIG = None

DB_FILE = None

LOG_LIST = []

INSTALL_TYPE = None
CURRENT_VERSION = None
LATEST_VERSION = None
COMMITS_BEHIND = None

UMASK = None


def initialize(config_file):
    with INIT_LOCK:

        global CONFIG
        global _INITIALIZED
        global CURRENT_VERSION
        global LATEST_VERSION
        global UMASK

        CONFIG = plexpy.config.Config(config_file)

        assert CONFIG is not None

        if _INITIALIZED:
            return False

        if CONFIG.HTTP_PORT < 21 or CONFIG.HTTP_PORT > 65535:
            plexpy.logger.warn(
                'HTTP_PORT out of bounds: 21 < %s < 65535', CONFIG.HTTP_PORT)
            CONFIG.HTTP_PORT = 8181

        if CONFIG.HTTPS_CERT == '':
            CONFIG.HTTPS_CERT = os.path.join(DATA_DIR, 'server.crt')
        if CONFIG.HTTPS_KEY == '':
            CONFIG.HTTPS_KEY = os.path.join(DATA_DIR, 'server.key')

        if not CONFIG.LOG_DIR:
            CONFIG.LOG_DIR = os.path.join(DATA_DIR, 'logs')

        if not os.path.exists(CONFIG.LOG_DIR):
            try:
                os.makedirs(CONFIG.LOG_DIR)
            except OSError:
                CONFIG.LOG_DIR = None

                if not QUIET:
                    sys.stderr.write("Unable to create the log directory. " \
                                     "Logging to screen only.\n")

        # Start the logger, disable console if needed
        logger.initLogger(console=not QUIET, log_dir=CONFIG.LOG_DIR,
                          verbose=VERBOSE)

        if not CONFIG.CACHE_DIR:
            # Put the cache dir in the data dir for now
            CONFIG.CACHE_DIR = os.path.join(DATA_DIR, 'cache')
        if not os.path.exists(CONFIG.CACHE_DIR):
            try:
                os.makedirs(CONFIG.CACHE_DIR)
            except OSError as e:
                logger.error("Could not create cache dir '%s': %s", DATA_DIR, e)

        # Initialize the database
        logger.info('Checking to see if the database has all tables....')
        try:
            dbcheck()
        except Exception as e:
            logger.error("Can't connect to the database: %s", e)

        # Check if PlexPy has a uuid
        if CONFIG.PMS_UUID == '' or not CONFIG.PMS_UUID:
            my_uuid = generate_uuid()
            CONFIG.__setattr__('PMS_UUID', my_uuid)
            CONFIG.write()

        # Get the currently installed version. Returns None, 'win32' or the git
        # hash.
        CURRENT_VERSION, CONFIG.GIT_BRANCH = versioncheck.getVersion()

        # Write current version to a file, so we know which version did work.
        # This allowes one to restore to that version. The idea is that if we
        # arrive here, most parts of PlexPy seem to work.
        if CURRENT_VERSION:
            version_lock_file = os.path.join(DATA_DIR, "version.lock")

            try:
                with open(version_lock_file, "w") as fp:
                    fp.write(CURRENT_VERSION)
            except IOError as e:
                logger.error("Unable to write current version to file '%s': %s",
                             version_lock_file, e)

        # Check for new versions
        if CONFIG.CHECK_GITHUB_ON_STARTUP:
            try:
                LATEST_VERSION = versioncheck.checkGithub()
            except:
                logger.exception("Unhandled exception")
                LATEST_VERSION = CURRENT_VERSION
        else:
            LATEST_VERSION = CURRENT_VERSION

        # Refresh the users list on startup
        if CONFIG.PMS_TOKEN and CONFIG.REFRESH_USERS_ON_STARTUP:
            plextv.refresh_users()

        # Store the original umask
        UMASK = os.umask(0)
        os.umask(UMASK)

        _INITIALIZED = True
        return True


def daemonize():
    if threading.activeCount() != 1:
        logger.warn(
            'There are %r active threads. Daemonizing may cause'
            ' strange behavior.',
            threading.enumerate())

    sys.stdout.flush()
    sys.stderr.flush()

    # Do first fork
    try:
        pid = os.fork()  # @UndefinedVariable - only available in UNIX
        if pid != 0:
            sys.exit(0)
    except OSError, e:
        raise RuntimeError("1st fork failed: %s [%d]", e.strerror, e.errno)

    os.setsid()

    # Make sure I can read my own files and shut out others
    prev = os.umask(0)  # @UndefinedVariable - only available in UNIX
    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:
            sys.exit(0)
    except OSError, e:
        raise RuntimeError("2nd fork failed: %s [%d]", e.strerror, e.errno)

    dev_null = file('/dev/null', 'r')
    os.dup2(dev_null.fileno(), sys.stdin.fileno())

    si = open('/dev/null', "r")
    so = open('/dev/null', "a+")
    se = open('/dev/null', "a+")

    os.dup2(si.fileno(), sys.stdin.fileno())
    os.dup2(so.fileno(), sys.stdout.fileno())
    os.dup2(se.fileno(), sys.stderr.fileno())

    pid = os.getpid()
    logger.info('Daemonized to PID: %d', pid)

    if CREATEPID:
        logger.info("Writing PID %d to %s", pid, PIDFILE)
        with file(PIDFILE, 'w') as fp:
            fp.write("%s\n" % pid)


def launch_browser(host, port, root):
    if host == '0.0.0.0':
        host = 'localhost'

    if CONFIG.ENABLE_HTTPS:
        protocol = 'https'
    else:
        protocol = 'http'

    try:
        webbrowser.open('%s://%s:%i%s' % (protocol, host, port, root))
    except Exception as e:
        logger.error('Could not launch browser: %s', e)


def initialize_scheduler():
    """
    Start the scheduled background tasks. Re-schedule if interval settings changed.
    """



    with SCHED_LOCK:

        # Check if scheduler should be started
        start_jobs = not len(SCHED.get_jobs())

        # Update check
        if CONFIG.CHECK_GITHUB_INTERVAL:
            minutes = CONFIG.CHECK_GITHUB_INTERVAL
        else:
            minutes = 0
        schedule_job(versioncheck.checkGithub, 'Check GitHub for updates', hours=0, minutes=minutes)

        # Start checking for new sessions every minute
        if CONFIG.MONITORING_INTERVAL:
            # Our interval should never be less than 30 seconds
            if CONFIG.MONITORING_INTERVAL > 30:
                seconds = CONFIG.MONITORING_INTERVAL
            else:
                seconds = 30
        else:
            seconds = 0

        if CONFIG.PMS_IP:
            schedule_job(monitor.check_active_sessions, 'Check for active sessions', hours=0, minutes=0, seconds=seconds)

        # Refresh the users list
        if CONFIG.REFRESH_USERS_INTERVAL:
            hours = CONFIG.REFRESH_USERS_INTERVAL
        else:
            hours = 0

        if CONFIG.PMS_TOKEN:
            schedule_job(plextv.refresh_users, 'Refresh users list', hours=hours, minutes=0, seconds=0)

        # Start scheduler
        if start_jobs and len(SCHED.get_jobs()):
            try:
                SCHED.start()
            except Exception as e:
                logger.info(e)

                # Debug
                #SCHED.print_jobs()


def schedule_job(function, name, hours=0, minutes=0, seconds=0):
    """
    Start scheduled job if starting or restarting plexpy.
    Reschedule job if Interval Settings have changed.
    Remove job if if Interval Settings changed to 0

    """

    job = SCHED.get_job(name)
    if job:
        if hours == 0 and minutes == 0 and seconds == 0:
            SCHED.remove_job(name)
            logger.info("Removed background task: %s", name)
        elif job.trigger.interval != datetime.timedelta(hours=hours, minutes=minutes):
            SCHED.reschedule_job(name, trigger=IntervalTrigger(
                hours=hours, minutes=minutes, seconds=seconds))
            logger.info("Re-scheduled background task: %s", name)
    elif hours > 0 or minutes > 0 or seconds > 0:
        SCHED.add_job(function, id=name, trigger=IntervalTrigger(
            hours=hours, minutes=minutes, seconds=seconds))
        logger.info("Scheduled background task: %s", name)


def start():
    global started

    if _INITIALIZED:
        initialize_scheduler()
        started = True


def sig_handler(signum=None, frame=None):
    if signum is not None:
        logger.info("Signal %i caught, saving and exiting...", signum)
        shutdown()


def dbcheck():
    conn = sqlite3.connect(plexpy.CONFIG.PLEXWATCH_DATABASE)
    c = conn.cursor()
    c.execute(
        'CREATE TABLE IF NOT EXISTS plexpy_users (id INTEGER PRIMARY KEY AUTOINCREMENT, '
        'user_id INTEGER DEFAULT NULL UNIQUE, username TEXT NOT NULL UNIQUE, '
        'friendly_name TEXT, thumb TEXT, email TEXT, is_home_user INTEGER DEFAULT NULL, '
        'is_allow_sync INTEGER DEFAULT NULL, is_restricted INTEGER DEFAULT NULL)'
    )

    # Upgrade plexpy_users table from earlier versions
    try:
        c.execute('SELECT user_id from plexpy_users')
    except sqlite3.OperationalError:
        logger.debug(u"Altering database. Updating database table plexpy_users.")
        c.execute(
            'CREATE TABLE tmp_table (id INTEGER PRIMARY KEY AUTOINCREMENT, '
            'user_id INTEGER DEFAULT NULL UNIQUE, username TEXT NOT NULL UNIQUE, '
            'friendly_name TEXT, thumb TEXT, email TEXT, is_home_user INTEGER DEFAULT NULL, '
            'is_allow_sync INTEGER DEFAULT NULL, is_restricted INTEGER DEFAULT NULL)'
        )
        c.execute(
            'INSERT INTO tmp_table SELECT id, NULL, username, friendly_name, NULL, NULL, NULL, NULL, NULL '
            'FROM plexpy_users'
        )
        c.execute(
            'DROP TABLE plexpy_users'
        )
        c.execute(
            'ALTER TABLE tmp_table RENAME TO plexpy_users'
        )

    conn.commit()
    c.close()

    conn_db = sqlite3.connect(DB_FILE)
    c_db = conn_db.cursor()

    # sessions table :: This is a temp table that logs currently active sessions
    c_db.execute(
        'CREATE TABLE IF NOT EXISTS sessions (id INTEGER PRIMARY KEY AUTOINCREMENT, '
        'session_key INTEGER, rating_key INTEGER, media_type TEXT, started INTEGER, '
        'paused_counter INTEGER, state TEXT, user_id INTEGER, user TEXT, friendly_name TEXT, ip_address TEXT, '
        'machine_id TEXT, player TEXT, platform TEXT, title TEXT, parent_title TEXT, '
        'grandparent_title TEXT, parent_rating_key INTEGER, grandparent_rating_key INTEGER, '
        'view_offset INTEGER DEFAULT 0, duration INTEGER, video_decision TEXT, audio_decision TEXT, '
        'width INTEGER, height INTEGER, container TEXT, video_codec TEXT, audio_codec TEXT, '
        'bitrate INTEGER, video_resolution TEXT, video_framerate TEXT, aspect_ratio TEXT, '
        'audio_channels INTEGER, transcode_protocol TEXT, transcode_container TEXT, '
        'transcode_video_codec TEXT, transcode_audio_codec TEXT, transcode_audio_channels INTEGER,'
        'transcode_width INTEGER, transcode_height INTEGER)'
    )

    # session_history table :: This is a history table which logs essential stream details
    c_db.execute(
        'CREATE TABLE IF NOT EXISTS session_history (id INTEGER PRIMARY KEY AUTOINCREMENT, '
        'started INTEGER, stopped INTEGER, rating_key INTEGER, user_id INTEGER, user TEXT, '
        'ip_address TEXT, paused_counter INTEGER, player TEXT, platform TEXT, machine_id TEXT, '
        'parent_rating_key INTEGER, grandparent_rating_key INTEGER, media_type TEXT, view_offset INTEGER)'
    )

    # session_history_media_info table :: This is a table which logs each session's media info
    c_db.execute(
        'CREATE TABLE IF NOT EXISTS session_history_media_info (id INTEGER PRIMARY KEY, '
        'rating_key INTEGER, video_decision TEXT, audio_decision TEXT, duration INTEGER, width INTEGER, '
        'height INTEGER, container TEXT, video_codec TEXT, audio_codec TEXT, bitrate INTEGER, video_resolution TEXT, '
        'video_framerate TEXT, aspect_ratio TEXT, audio_channels INTEGER, transcode_protocol TEXT, '
        'transcode_container TEXT, transcode_video_codec TEXT, transcode_audio_codec TEXT, '
        'transcode_audio_channels INTEGER, transcode_width INTEGER, transcode_height INTEGER)'
    )

    # session_history_metadata table :: This is a table which logs each session's media metadata
    c_db.execute(
        'CREATE TABLE IF NOT EXISTS session_history_metadata (id INTEGER PRIMARY KEY, '
        'rating_key INTEGER, parent_rating_key INTEGER, grandparent_rating_key INTEGER, '
        'title TEXT, parent_title TEXT, grandparent_title TEXT, media_index INTEGER, parent_media_index INTEGER, '
        'thumb TEXT, parent_thumb TEXT, grandparent_thumb TEXT, art TEXT, media_type TEXT, '
        'year INTEGER, originally_available_at TEXT, added_at INTEGER, updated_at INTEGER, last_viewed_at INTEGER, '
        'content_rating TEXT, summary TEXT, rating TEXT, duration INTEGER, guid TEXT, '
        'directors TEXT, writers TEXT, actors TEXT, genres TEXT, studio TEXT)'
        ''
    )

    # users table :: This table keeps record of the friends list
    c_db.execute(
        'CREATE TABLE IF NOT EXISTS users (id INTEGER PRIMARY KEY AUTOINCREMENT, '
        'user_id INTEGER DEFAULT NULL UNIQUE, username TEXT NOT NULL UNIQUE, '
        'friendly_name TEXT, thumb TEXT, email TEXT, is_home_user INTEGER DEFAULT NULL, '
        'is_allow_sync INTEGER DEFAULT NULL, is_restricted INTEGER DEFAULT NULL)'
    )

    # Upgrade sessions table from earlier versions
    try:
        c_db.execute('SELECT started from sessions')
    except sqlite3.OperationalError:
        logger.debug(u"Altering database. Updating database table sessions.")
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN started INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN paused_counter INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN state TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN user TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN machine_id TEXT'
        )

    # Upgrade sessions table from earlier versions
    try:
        c_db.execute('SELECT title from sessions')
    except sqlite3.OperationalError:
        logger.debug(u"Altering database. Updating database table sessions.")
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN title TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN parent_title TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN grandparent_title TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN friendly_name TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN player TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN user_id INTEGER'
        )

    # Upgrade sessions table from earlier versions
    try:
        c_db.execute('SELECT ip_address from sessions')
    except sqlite3.OperationalError:
        logger.debug(u"Altering database. Updating database table sessions.")
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN ip_address TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN platform TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN parent_rating_key INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN grandparent_rating_key INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN view_offset INTEGER DEFAULT 0'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN duration INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN video_decision TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN audio_decision TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN width INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN height INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN container TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN video_codec TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN audio_codec TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN bitrate INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN video_resolution TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN video_framerate TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN aspect_ratio TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN audio_channels INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN transcode_protocol TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN transcode_container TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN transcode_video_codec TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN transcode_audio_codec TEXT'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN transcode_audio_channels INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN transcode_width INTEGER'
        )
        c_db.execute(
            'ALTER TABLE sessions ADD COLUMN transcode_height INTEGER'
        )

    conn_db.commit()
    c_db.close()

def shutdown(restart=False, update=False):
    cherrypy.engine.exit()
    SCHED.shutdown(wait=False)

    # Clear any sessions in the db - Not sure yet if we should do this. More testing required
    # logger.debug(u'Clearing Plex sessions.')
    # monitor.drop_session_db()

    CONFIG.write()

    if not restart and not update:
        logger.info('PlexPy is shutting down...')

    if update:
        logger.info('PlexPy is updating...')
        try:
            versioncheck.update()
        except Exception as e:
            logger.warn('PlexPy failed to update: %s. Restarting.', e)

    if CREATEPID:
        logger.info('Removing pidfile %s', PIDFILE)
        os.remove(PIDFILE)

    if restart:
        logger.info('PlexPy is restarting...')
        popen_list = [sys.executable, FULL_PATH]
        popen_list += ARGS
        if '--nolaunch' not in popen_list:
            popen_list += ['--nolaunch']
        logger.info('Restarting PlexPy with %s', popen_list)
        subprocess.Popen(popen_list, cwd=os.getcwd())

    os._exit(0)

def generate_uuid():
    logger.debug(u"Generating UUID...")
    return uuid.uuid4().hex