# -*- coding: utf-8 -*-

##########################################################################
# OpenLP - Open Source Lyrics Projection                                 #
# ---------------------------------------------------------------------- #
# Copyright (c) 2008-2020 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 time import sleep

from PyQt5 import QtCore, QtWidgets

from openlp.core.common import is_linux, is_macosx, is_win
from openlp.core.common.settings import Settings
from openlp.core.display.screens import ScreenList
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


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
    """
    # Import the VLC module if not already done
    if 'vlc' not in sys.modules:
        try:
            import vlc  # noqa module is not used directly, but is used via sys.modules['vlc']
        except (ImportError, OSError):
            return None
    # Verify that VLC is also loadable
    is_vlc_available = False
    try:
        is_vlc_available = bool(sys.modules['vlc'].get_default_instance())
    except Exception:
        pass
    if is_vlc_available:
        return sys.modules['vlc']
    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 'pytest' 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

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

        :param controller: The display where the media is
        :param live_display: Is the display a live one.
        :return:
        """
        vlc = get_vlc()
        if controller.is_live:
            controller.vlc_widget = QtWidgets.QFrame()
            controller.vlc_widget.setWindowFlags(QtCore.Qt.FramelessWindowHint | QtCore.Qt.Tool |
                                                 QtCore.Qt.WindowStaysOnTopHint)
        else:
            controller.vlc_widget = QtWidgets.QFrame(display)
        controller.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 '
        if Settings().value('media/vlc arguments'):
            command_line_options += Settings().value('media/vlc arguments')
        controller.vlc_instance = vlc.Instance(command_line_options)
        # creating an empty vlc media player
        controller.vlc_media_player = controller.vlc_instance.media_player_new()
        controller.vlc_widget.resize(controller.size())
        controller.vlc_widget.raise_()
        controller.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(controller.vlc_widget.winId())
        if is_win():
            controller.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.
            controller.vlc_media_player.set_nsobject(win_id)
        else:
            # for Linux/*BSD using the X Server
            controller.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, controller, output_display, file=None):
        """
        Load a video into VLC

        :param controller: The controller where the media is
        :param output_display: The display where the media is
        :param file: file to be played or None for live streaming
        :return:
        """
        vlc = get_vlc()
        log.debug('load vid in Vlc Controller')
        path = None
        if file:
            path = os.path.normcase(file)
        # create the media
        if controller.media_info.media_type == MediaType.CD:
            if is_win():
                path = '/' + path
            controller.vlc_media = controller.vlc_instance.media_new_location('cdda://' + path)
            controller.vlc_media_player.set_media(controller.vlc_media)
            controller.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 = controller.vlc_media.subitems()
            if not audio_cd_tracks or audio_cd_tracks.count() < 1:
                return False
            controller.vlc_media_player = audio_cd_tracks.item_at_index(controller.media_info.title_track)
        elif controller.media_info.media_type == MediaType.Stream:
            stream_cmd = Settings().value('media/stream command')
            controller.vlc_media = controller.vlc_instance.media_new_location(stream_cmd)
        else:
            controller.vlc_media = controller.vlc_instance.media_new_path(path)
        # put the media in the media player
        controller.vlc_media_player.set_media(controller.vlc_media)
        # parse the metadata of the file
        controller.vlc_media.parse()
        self.volume(controller, controller.media_info.volume)
        return True

    def media_state_wait(self, controller, 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 controller: The controller where the media is
        :return:
        """
        vlc = get_vlc()
        start = datetime.now()
        while media_state != controller.vlc_media.get_state():
            sleep(0.1)
            if controller.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, controller):
        """
        Resize the player

        :param controller: The display where the media is stored within the controller.
        :return:
        """
        if controller.is_live:
            controller.vlc_widget.setGeometry(ScreenList().current.display_geometry)
        else:
            controller.vlc_widget.resize(controller.preview_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 controller.is_live:
            if self.get_live_state() != MediaState.Paused and controller.media_info.start_time > 0:
                start_time = controller.media_info.start_time
        else:
            if self.get_preview_state() != MediaState.Paused and controller.media_info.start_time > 0:
                start_time = controller.media_info.start_time
        threading.Thread(target=controller.vlc_media_player.play).start()
        if not self.media_state_wait(controller, vlc.State.Playing):
            return False
        if controller.is_live:
            if self.get_live_state() != MediaState.Paused and controller.media_info.start_time > 0:
                log.debug('vlc play, start time set')
                start_time = controller.media_info.start_time
        else:
            if self.get_preview_state() != MediaState.Paused and controller.media_info.start_time > 0:
                log.debug('vlc play, start time set')
                start_time = controller.media_info.start_time
        log.debug('mediatype: ' + str(controller.media_info.media_type))
        # Set tracks for the optical device
        if controller.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 controller.media_info.title_track > 0:
                log.debug('vlc play, title_track set: ' + str(controller.media_info.title_track))
                controller.vlc_media_player.set_title(controller.media_info.title_track)
            controller.vlc_media_player.play()
            if not self.media_state_wait(controller, vlc.State.Playing):
                return False
            if controller.media_info.audio_track > 0:
                controller.vlc_media_player.audio_set_track(controller.media_info.audio_track)
                log.debug('vlc play, audio_track set: ' + str(controller.media_info.audio_track))
            if controller.media_info.subtitle_track > 0:
                controller.vlc_media_player.video_set_spu(controller.media_info.subtitle_track)
                log.debug('vlc play, subtitle_track set: ' + str(controller.media_info.subtitle_track))
            if controller.media_info.start_time > 0:
                log.debug('vlc play, starttime set: ' + str(controller.media_info.start_time))
                start_time = controller.media_info.start_time
            controller.media_info.length = controller.media_info.end_time - controller.media_info.start_time
        self.volume(controller, controller.media_info.volume)
        if start_time > 0 and controller.vlc_media_player.is_seekable():
            controller.vlc_media_player.set_time(int(start_time))
        controller.seek_slider.setMaximum(controller.media_info.length)
        self.set_state(MediaState.Playing, controller)
        controller.vlc_widget.raise_()
        return True

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

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

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

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

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

        :param vol: The volume to be sets
        :param controller: The controller where the media is
        :return:
        """
        controller.vlc_media_player.audio_set_volume(vol)

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

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

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

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

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

        :param controller: The controller where the media display is
        :param status: The visibility status
        """
        controller.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 controller.vlc_media.get_state() == vlc.State.Ended:
            self.stop(controller)
        if controller.media_info.end_time > 0:
            if controller.vlc_media_player.get_time() > controller.media_info.end_time:
                self.stop(controller)
                self.set_visible(controller, 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(
                    controller.vlc_media_player.get_time() - int(controller.media_info.start_time))
            else:
                controller.seek_slider.setSliderPosition(controller.vlc_media_player.get_time())
            controller.seek_slider.blockSignals(False)