# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4

##########################################################################
# OpenLP - Open Source Lyrics Projection                                 #
# ---------------------------------------------------------------------- #
# Copyright (c) 2008-2019 OpenLP Developers                              #
# ---------------------------------------------------------------------- #
# This program 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.                                    #
#                                                                        #
# This program 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 this program.  If not, see <https://www.gnu.org/licenses/>. #
##########################################################################
"""
The :mod:`~openlp.core.ui.media.vlcplayer` module contains our VLC component wrapper
"""
import ctypes
import logging
import os
import sys
import threading
from datetime import datetime
from distutils.version import LooseVersion

from PyQt5 import QtWidgets

from openlp.core.common import is_linux, is_macosx, is_win
from openlp.core.common.i18n import translate
from openlp.core.common.settings import Settings
from openlp.core.ui.media import MediaState, MediaType
from openlp.core.ui.media.mediaplayer import MediaPlayer


log = logging.getLogger(__name__)

# Audio and video extensions copied from 'include/vlc_interface.h' from vlc 2.2.0 source
AUDIO_EXT = ['*.3ga', '*.669', '*.a52', '*.aac', '*.ac3', '*.adt', '*.adts', '*.aif', '*.aifc', '*.aiff', '*.amr',
             '*.aob', '*.ape', '*.awb', '*.caf', '*.dts', '*.flac', '*.it', '*.kar', '*.m4a', '*.m4b', '*.m4p', '*.m5p',
             '*.mid', '*.mka', '*.mlp', '*.mod', '*.mpa', '*.mp1', '*.mp2', '*.mp3', '*.mpc', '*.mpga', '*.mus',
             '*.oga', '*.ogg', '*.oma', '*.opus', '*.qcp', '*.ra', '*.rmi', '*.s3m', '*.sid', '*.spx', '*.thd', '*.tta',
             '*.voc', '*.vqf', '*.w64', '*.wav', '*.wma', '*.wv', '*.xa', '*.xm']

VIDEO_EXT = ['*.3g2', '*.3gp', '*.3gp2', '*.3gpp', '*.amv', '*.asf', '*.avi', '*.bik', '*.divx', '*.drc', '*.dv',
             '*.f4v', '*.flv', '*.gvi', '*.gxf', '*.iso', '*.m1v', '*.m2v', '*.m2t', '*.m2ts', '*.m4v', '*.mkv',
             '*.mov', '*.mp2', '*.mp2v', '*.mp4', '*.mp4v', '*.mpe', '*.mpeg', '*.mpeg1', '*.mpeg2', '*.mpeg4', '*.mpg',
             '*.mpv2', '*.mts', '*.mtv', '*.mxf', '*.mxg', '*.nsv', '*.nuv', '*.ogg', '*.ogm', '*.ogv', '*.ogx', '*.ps',
             '*.rec', '*.rm', '*.rmvb', '*.rpl', '*.thp', '*.tod', '*.ts', '*.tts', '*.txd', '*.vob', '*.vro', '*.webm',
             '*.wm', '*.wmv', '*.wtv', '*.xesc',
             # These extensions was not in the official list, added manually.
             '*.nut', '*.rv', '*.xvid']


def get_vlc():
    """
    In order to make this module more testable, we have to wrap the VLC import inside a method. We do this so that we
    can mock out the VLC module entirely.

    :return: The "vlc" module, or None
    """
    if 'openlp.core.ui.media.vendor.vlc' in sys.modules:
        # If VLC has already been imported, no need to do all the stuff below again
        is_vlc_available = False
        try:
            is_vlc_available = bool(sys.modules['openlp.core.ui.media.vendor.vlc'].get_default_instance())
        except Exception:
            pass
        if is_vlc_available:
            return sys.modules['openlp.core.ui.media.vendor.vlc']
        else:
            return None
    is_vlc_available = False
    try:
        if is_macosx():
            # Newer versions of VLC on OS X need this. See https://forum.videolan.org/viewtopic.php?t=124521
            os.environ['VLC_PLUGIN_PATH'] = '/Applications/VLC.app/Contents/MacOS/plugins'
        # On Windows when frozen in PyInstaller, we need to blank SetDllDirectoryW to allow loading of the VLC dll.
        # This is due to limitations (by design) in PyInstaller. SetDllDirectoryW original value is restored once
        # VLC has been imported.
        if is_win():
            buffer_size = 1024
            dll_directory = ctypes.create_unicode_buffer(buffer_size)
            new_buffer_size = ctypes.windll.kernel32.GetDllDirectoryW(buffer_size, dll_directory)
            dll_directory = ''.join(dll_directory[:new_buffer_size]).replace('\0', '')
            log.debug('Original DllDirectory: %s' % dll_directory)
            ctypes.windll.kernel32.SetDllDirectoryW(None)
        from openlp.core.ui.media.vendor import vlc
        if is_win():
            ctypes.windll.kernel32.SetDllDirectoryW(dll_directory)
        is_vlc_available = bool(vlc.get_default_instance())
    except (ImportError, NameError, NotImplementedError):
        pass
    except OSError as e:
        # this will get raised the first time
        if is_win():
            if not isinstance(e, WindowsError) and e.winerror != 126:
                raise
        else:
            pass
    if is_vlc_available:
        try:
            VERSION = vlc.libvlc_get_version().decode('UTF-8')
        except Exception:
            VERSION = '0.0.0'
        # LooseVersion does not work when a string contains letter and digits (e. g. 2.0.5 Twoflower).
        # http://bugs.python.org/issue14894
        if LooseVersion(VERSION.split()[0]) < LooseVersion('1.1.0'):
            is_vlc_available = False
            log.debug('VLC could not be loaded, because the vlc version is too old: %s' % VERSION)
    if is_vlc_available:
        return vlc
    else:
        return None


# On linux we need to initialise X threads, but not when running tests.
# This needs to happen on module load and not in get_vlc(), otherwise it can cause crashes on some DE on some setups
# (reported on Gnome3, Unity, Cinnamon, all GTK+ based) when using native filedialogs...
if is_linux() and 'nose' not in sys.argv[0] and get_vlc():
    try:
        try:
            x11 = ctypes.cdll.LoadLibrary('libX11.so.6')
        except OSError:
            # If libx11.so.6 was not found, fallback to more generic libx11.so
            x11 = ctypes.cdll.LoadLibrary('libX11.so')
        x11.XInitThreads()
    except Exception:
        log.exception('Failed to run XInitThreads(), VLC might not work properly!')


class VlcPlayer(MediaPlayer):
    """
    A specialised version of the MediaPlayer class, which provides a VLC display.
    """

    def __init__(self, parent):
        """
        Constructor
        """
        super(VlcPlayer, self).__init__(parent, 'vlc')
        self.original_name = 'VLC'
        self.display_name = '&VLC'
        self.parent = parent
        self.can_folder = True
        self.audio_extensions_list = AUDIO_EXT
        self.video_extensions_list = VIDEO_EXT

    def setup(self, output_display, live_display):
        """
        Set up the media player

        :param output_display: The display where the media is
        :param live_display: Is the display a live one.
        :return:
        """
        vlc = get_vlc()
        output_display.vlc_widget = QtWidgets.QFrame(output_display)
        output_display.vlc_widget.setFrameStyle(QtWidgets.QFrame.NoFrame)
        # creating a basic vlc instance
        command_line_options = '--no-video-title-show'
        if Settings().value('advanced/hide mouse') and live_display:
            command_line_options += ' --mouse-hide-timeout=0'
        output_display.vlc_instance = vlc.Instance(command_line_options)
        # creating an empty vlc media player
        output_display.vlc_media_player = output_display.vlc_instance.media_player_new()
        output_display.vlc_widget.resize(output_display.size())
        output_display.vlc_widget.raise_()
        output_display.vlc_widget.hide()
        # The media player has to be 'connected' to the QFrame.
        # (otherwise a video would be displayed in it's own window)
        # This is platform specific!
        # You have to give the id of the QFrame (or similar object)
        # to vlc, different platforms have different functions for this.
        win_id = int(output_display.vlc_widget.winId())
        if is_win():
            output_display.vlc_media_player.set_hwnd(win_id)
        elif is_macosx():
            # We have to use 'set_nsobject' since Qt5 on OSX uses Cocoa
            # framework and not the old Carbon.
            output_display.vlc_media_player.set_nsobject(win_id)
        else:
            # for Linux/*BSD using the X Server
            output_display.vlc_media_player.set_xwindow(win_id)
        self.has_own_widget = True

    def check_available(self):
        """
        Return the availability of VLC
        """
        return get_vlc() is not None

    def load(self, output_display, file):
        """
        Load a video into VLC

        :param output_display: The display where the media is
        :param file: file to be played
        :return:
        """
        vlc = get_vlc()
        log.debug('load vid in Vlc Controller')
        controller = output_display
        volume = controller.media_info.volume
        path = os.path.normcase(file)
        # create the media
        if controller.media_info.media_type == MediaType.CD:
            if is_win():
                path = '/' + path
            output_display.vlc_media = output_display.vlc_instance.media_new_location('cdda://' + path)
            output_display.vlc_media_player.set_media(output_display.vlc_media)
            output_display.vlc_media_player.play()
            # Wait for media to start playing. In this case VLC actually returns an error.
            self.media_state_wait(output_display, vlc.State.Playing)
            # If subitems exists, this is a CD
            audio_cd_tracks = output_display.vlc_media.subitems()
            if not audio_cd_tracks or audio_cd_tracks.count() < 1:
                return False
            output_display.vlc_media = audio_cd_tracks.item_at_index(controller.media_info.title_track)
        elif controller.media_info.media_type == MediaType.Stream:
            output_display.vlc_media = output_display.vlc_instance.media_new_location('ZZZZZZ')
        else:
            output_display.vlc_media = output_display.vlc_instance.media_new_path(path)
        # put the media in the media player
        output_display.vlc_media_player.set_media(output_display.vlc_media)
        # parse the metadata of the file
        output_display.vlc_media.parse()
        self.volume(output_display, volume)
        return True

    def media_state_wait(self, output_display, media_state):
        """
        Wait for the video to change its state
        Wait no longer than 60 seconds. (loading an iso file needs a long time)

        :param media_state: The state of the playing media
        :param display: The display where the media is
        :return:
        """
        vlc = get_vlc()
        start = datetime.now()
        while media_state != output_display.vlc_media.get_state():
            if output_display.vlc_media.get_state() == vlc.State.Error:
                return False
            self.application.process_events()
            if (datetime.now() - start).seconds > 60:
                return False
        return True

    def resize(self, output_display):
        """
        Resize the player

        :param output_display: The display where the media is
        :return:
        """
        output_display.vlc_widget.resize(output_display.size())

    def play(self, controller, output_display):
        """
        Play the current item

        :param controller: Which Controller is running the show.
        :param output_display: The display where the media is
        :return:
        """
        vlc = get_vlc()
        start_time = 0
        log.debug('vlc play')
        if output_display.is_display:
            if self.get_live_state() != MediaState.Paused and output_display.media_info.start_time > 0:
                start_time = output_display.media_info.start_time
        else:
            if self.get_preview_state() != MediaState.Paused and output_display.media_info.start_time > 0:
                start_time = output_display.media_info.start_time
        threading.Thread(target=output_display.vlc_media_player.play).start()
        if not self.media_state_wait(output_display, vlc.State.Playing):
            return False
        if output_display.is_display:
            if self.get_live_state() != MediaState.Paused and output_display.media_info.start_time > 0:
                log.debug('vlc play, start time set')
                start_time = output_display.media_info.start_time
        else:
            if self.get_preview_state() != MediaState.Paused and output_display.media_info.start_time > 0:
                log.debug('vlc play, start time set')
                start_time = output_display.media_info.start_time
        log.debug('mediatype: ' + str(output_display.media_info.media_type))
        # Set tracks for the optical device
        if output_display.media_info.media_type == MediaType.DVD and \
                self.get_live_state() != MediaState.Paused and self.get_preview_state() != MediaState.Paused:
            log.debug('vlc play, playing started')
            if output_display.media_info.title_track > 0:
                log.debug('vlc play, title_track set: ' + str(output_display.media_info.title_track))
                output_display.vlc_media_player.set_title(output_display.media_info.title_track)
            output_display.vlc_media_player.play()
            if not self.media_state_wait(output_display, vlc.State.Playing):
                return False
            if output_display.media_info.audio_track > 0:
                output_display.vlc_media_player.audio_set_track(output_display.media_info.audio_track)
                log.debug('vlc play, audio_track set: ' + str(output_display.media_info.audio_track))
            if output_display.media_info.subtitle_track > 0:
                output_display.vlc_media_player.video_set_spu(output_display.media_info.subtitle_track)
                log.debug('vlc play, subtitle_track set: ' + str(output_display.media_info.subtitle_track))
            if output_display.media_info.start_time > 0:
                log.debug('vlc play, starttime set: ' + str(output_display.media_info.start_time))
                start_time = output_display.media_info.start_time
            output_display.media_info.length = output_display.media_info.end_time - output_display.media_info.start_time
        self.volume(output_display, output_display.media_info.volume)
        if start_time > 0 and output_display.vlc_media_player.is_seekable():
            output_display.vlc_media_player.set_time(int(start_time))
        controller.seek_slider.setMaximum(output_display.media_info.length)
        self.set_state(MediaState.Playing, output_display)
        output_display.vlc_widget.raise_()
        return True

    def pause(self, output_display):
        """
        Pause the current item

        :param output_display: The display where the media is
        :return:
        """
        vlc = get_vlc()
        if output_display.vlc_media.get_state() != vlc.State.Playing:
            return
        output_display.vlc_media_player.pause()
        if self.media_state_wait(output_display, vlc.State.Paused):
            self.set_state(MediaState.Paused, output_display)

    def stop(self, output_display):
        """
        Stop the current item

        :param output_display: The display where the media is
        :return:
        """
        threading.Thread(target=output_display.vlc_media_player.stop).start()
        self.set_state(MediaState.Stopped, output_display)

    def volume(self, output_display, vol):
        """
        Set the volume

        :param vol: The volume to be sets
        :param output_display: The display where the media is
        :return:
        """
        if output_display.has_audio:
            output_display.vlc_media_player.audio_set_volume(vol)

    def seek(self, output_display, seek_value):
        """
        Go to a particular position

        :param seek_value: The position of where a seek goes to
        :param output_display: The display where the media is
        """
        if output_display.controller.media_info.media_type == MediaType.CD \
                or output_display.controller.media_info.media_type == MediaType.DVD:
            seek_value += int(output_display.controller.media_info.start_time)
        if output_display.vlc_media_player.is_seekable():
            output_display.vlc_media_player.set_time(seek_value)

    def reset(self, output_display):
        """
        Reset the player

        :param output_display: The display where the media is
        """
        output_display.vlc_media_player.stop()
        output_display.vlc_widget.setVisible(False)
        self.set_state(MediaState.Off, output_display)

    def set_visible(self, output_display, status):
        """
        Set the visibility

        :param output_display: The display where the media is
        :param status: The visibility status
        """
        if self.has_own_widget:
            output_display.vlc_widget.setVisible(status)

    def update_ui(self, controller, output_display):
        """
        Update the UI

        :param controller: Which Controller is running the show.
        :param output_display: The display where the media is
        """
        vlc = get_vlc()
        # Stop video if playback is finished.
        if output_display.vlc_media.get_state() == vlc.State.Ended:
            self.stop(output_display)
        if controller.media_info.end_time > 0:
            if output_display.vlc_media_player.get_time() > controller.media_info.end_time:
                self.stop(output_display)
                self.set_visible(output_display, False)
        if not controller.seek_slider.isSliderDown():
            controller.seek_slider.blockSignals(True)
            if controller.media_info.media_type == MediaType.CD \
                    or controller.media_info.media_type == MediaType.DVD:
                controller.seek_slider.setSliderPosition(
                    output_display.vlc_media_player.get_time() - int(output_display.controller.media_info.start_time))
            else:
                controller.seek_slider.setSliderPosition(output_display.vlc_media_player.get_time())
            controller.seek_slider.blockSignals(False)

    def get_info(self):
        """
        Return some information about this player
        """
        return(translate('Media.player', 'VLC is an external player which '
               'supports a number of different formats.') +
               '<br/> <strong>' + translate('Media.player', 'Audio') +
               '</strong><br/>' + str(AUDIO_EXT) + '<br/><strong>' +
               translate('Media.player', 'Video') + '</strong><br/>' +
               str(VIDEO_EXT) + '<br/>')