# coding:utf8
import os
import re
import sys
import time
import subprocess
import threading
import ast

from syncplay import constants
from syncplay.messages import getMessage
from syncplay.players.basePlayer import BasePlayer
from syncplay.utils import isURL, findResourcePath
from syncplay.utils import isMacOS, isWindows, isASCII
from syncplay.vendor.python_mpv_jsonipc.python_mpv_jsonipc import MPV

class MpvPlayer(BasePlayer):
    RE_VERSION = re.compile(r'.*mpv (\d+)\.(\d+)\.\d+.*')
    osdMessageSeparator = "\\n"
    osdMessageSeparator = "; "  # TODO: Make conditional
    POSITION_QUERY = 'time-pos'
    OSD_QUERY = 'show_text'
    RE_ANSWER = re.compile(constants.MPLAYER_ANSWER_REGEX)
    lastResetTime = None
    lastMPVPositionUpdate = None
    alertOSDSupported = True
    chatOSDSupported = True
    speedSupported = True
    customOpenDialog = False

    @staticmethod
    def run(client, playerPath, filePath, args):
        try:
            ver = MpvPlayer.RE_VERSION.search(subprocess.check_output([playerPath, '--version']).decode('utf-8'))
        except:
            ver = None
        constants.MPV_NEW_VERSION = ver is None or int(ver.group(1)) > 0 or int(ver.group(2)) >= 23
        if not constants.MPV_NEW_VERSION:
            from twisted.internet import reactor
            the_reactor = reactor
            the_reactor.callFromThread(client.ui.showErrorMessage,
                                        "This version of mpv is not compatible with Syncplay. "
                                        "Please use mpv >=0.23.0.", True)
            the_reactor.callFromThread(client.stop)
            return

        constants.MPV_OSC_VISIBILITY_CHANGE_VERSION = False if ver is None else int(ver.group(1)) > 0 or int(ver.group(2)) >= 28
        if not constants.MPV_OSC_VISIBILITY_CHANGE_VERSION:
            client.ui.showDebugMessage(
                "This version of mpv is not known to be compatible with changing the OSC visibility. "
                "Please use mpv >=0.28.0.")
        return MpvPlayer(client, MpvPlayer.getExpandedPath(playerPath), filePath, args)

    @staticmethod
    def getStartupArgs(userArgs):
        args = constants.MPV_ARGS
        args["script"] = findResourcePath("syncplayintf.lua")
        if userArgs:
            for argToAdd in userArgs:
                if argToAdd.startswith('--'):
                    argToAdd = argToAdd[2:]
                elif argToAdd.startswith('-'):
                    argToAdd = argToAdd[1:]
                if argToAdd.strip() == "":
                    continue
                if "=" in argToAdd:
                    (argName, argValue) = argToAdd.split("=", 1)
                    if argValue[0] == '"' and argValue[-1] == '"':
                        argValue = argValue[1:-1]
                else:
                    argName = argToAdd
                    argValue = ""
                args[argName] = argValue
        return args

    @staticmethod
    def getDefaultPlayerPathsList():
        l = []
        for path in constants.MPV_PATHS:
            p = MpvPlayer.getExpandedPath(path)
            if p:
                l.append(p)
        return l

    @staticmethod
    def isValidPlayerPath(path):
        if "mpv" in path and "mpvnet" not in path and MpvPlayer.getExpandedPath(path):
            return True
        return False

    @staticmethod
    def getExpandedPath(playerPath):
        if not os.path.isfile(playerPath):
            if os.path.isfile(playerPath + "mpv.exe"):
                playerPath += "mpv.exe"
                return playerPath
            elif os.path.isfile(playerPath + "\\mpv.exe"):
                playerPath += "\\mpv.exe"
                return playerPath
        if os.access(playerPath, os.X_OK):
            return playerPath
        for path in os.environ['PATH'].split(':'):
            path = os.path.join(os.path.realpath(path), playerPath)
            if os.access(path, os.X_OK):
                return path

    @staticmethod
    def getIconPath(path):
        return constants.MPV_ICONPATH

    @staticmethod
    def getPlayerPathErrors(playerPath, filePath):
        return None

    def _setProperty(self, property_, value):
        self._listener.sendLine(["set_property", property_, value])

    def mpvErrorCheck(self, line):
        if "Error parsing option" in line or "Error parsing commandline option" in line:
            self.quitReason = getMessage("mpv-version-error")

        elif "Could not open pipe at '/dev/stdin'" in line:
            self.reactor.callFromThread(self._client.ui.showErrorMessage, getMessage("mpv-version-error"), True)
            self.drop()

        if constants and any(errormsg in line for errormsg in constants.MPV_ERROR_MESSAGES_TO_REPEAT):
            self._client.ui.showErrorMessage(line)

    def displayMessage(self, message, duration=(constants.OSD_DURATION * 1000), OSDType=constants.OSD_NOTIFICATION,
                       mood=constants.MESSAGE_NEUTRAL):
        if not self._client._config["chatOutputEnabled"]:
            messageString = self._sanitizeText(message.replace("\\n", "<NEWLINE>")).replace("<NEWLINE>", "\\n")
            self._listener.mpvpipe.show_text(messageString, duration, constants.MPLAYER_OSD_LEVEL)
            return
        messageString = self._sanitizeText(message.replace("\\n", "<NEWLINE>")).replace(
            "\\\\", constants.MPV_INPUT_BACKSLASH_SUBSTITUTE_CHARACTER).replace("<NEWLINE>", "\\n")
        self._listener.sendLine(["script-message-to", "syncplayintf", "{}-osd-{}".format(OSDType, mood), messageString])

    def displayChatMessage(self, username, message):
        if not self._client._config["chatOutputEnabled"]:
            messageString = "<{}> {}".format(username, message)
            messageString = self._sanitizeText(messageString.replace("\\n", "<NEWLINE>")).replace("<NEWLINE>", "\\n")
            duration = int(constants.OSD_DURATION * 1000)
            self._listener.mpvpipe.show_text(messageString, duration, constants.MPLAYER_OSD_LEVEL)
            return
        username = self._sanitizeText(username.replace("\\", constants.MPV_INPUT_BACKSLASH_SUBSTITUTE_CHARACTER))
        message = self._sanitizeText(message.replace("\\", constants.MPV_INPUT_BACKSLASH_SUBSTITUTE_CHARACTER))
        messageString = "<{}> {}".format(username, message)
        self._listener.sendLine(["script-message-to", "syncplayintf", "chat", messageString])

    def setSpeed(self, value):
        self._setProperty('speed', "{:.2f}".format(value))

    def setPaused(self, value):
        if self._paused == value:
            self._client.ui.showDebugMessage("Not sending setPaused to mpv as state is already {}".format(value))
            return
        pauseValue = "yes" if value else "no"
        self._setProperty("pause", pauseValue)
        self._paused = value
        if value == False:
            self.lastMPVPositionUpdate = time.time()

    def _getFilename(self):
        self._getProperty('filename')

    def _getLength(self):
        self._getProperty('length')

    def _getFilepath(self):
        self._getProperty('path')

    def _getProperty(self, property_):
        floatProperties = ['time-pos']
        if property_ in floatProperties:
            propertyID = "={}".format(property_)
        elif property_ == 'length':
            propertyID = '=duration:${=length:0}'
        else:
            propertyID = property_
        self._listener.sendLine(["print_text", '"ANS_{}=${{{}}}"'.format(property_, propertyID)])

    def getCalculatedPosition(self):
        if self.fileLoaded == False:
            self._client.ui.showDebugMessage(
                "File not loaded so using GlobalPosition for getCalculatedPosition({})".format(
                    self._client.getGlobalPosition()))
            return self._client.getGlobalPosition()

        if self.lastMPVPositionUpdate is None:
            self._client.ui.showDebugMessage(
                "MPV not updated position so using GlobalPosition for getCalculatedPosition ({})".format(
                    self._client.getGlobalPosition()))
            return self._client.getGlobalPosition()

        if self._recentlyReset():
            self._client.ui.showDebugMessage(
                "Recently reset so using self.position for getCalculatedPosition ({})".format(
                    self._position))
            return self._position

        diff = time.time() - self.lastMPVPositionUpdate

        if diff > constants.MPV_UNRESPONSIVE_THRESHOLD:
            self.reactor.callFromThread(
                self._client.ui.showErrorMessage, getMessage("mpv-unresponsive-error").format(int(diff)), True)
            self.drop()
        if diff > constants.PLAYER_ASK_DELAY and not self._paused:
            self._client.ui.showDebugMessage(
                "mpv did not response in time, so assuming position is {} ({}+{})".format(
                    self._position + diff, self._position, diff))
            return self._position + diff
        else:
            return self._position

    def eofDetected(self):
        self._client.eofReportedByPlayer()

    def _storePosition(self, value):
        if value is None:
            self._client.ui.showDebugMessage("NONE TYPE POSITION!")
            return
        self.lastMPVPositionUpdate = time.time()
        if self._recentlyReset():
            self._client.ui.showDebugMessage("Recently reset, so storing position as 0")
            self._position = 0
        elif self._fileIsLoaded() or (value < constants.MPV_NEWFILE_IGNORE_TIME and self._fileIsLoaded(ignoreDelay=True)):
            old_position = float(self._position)
            self._position = max(value, 0)
            #self._client.ui.showDebugMessage("Position changed from {} to {}".format(old_position, self._position))
        else:
            self._client.ui.showDebugMessage(
                "No file loaded so storing position {} as GlobalPosition ({})".format(value, self._client.getGlobalPosition()))
            self._position = self._client.getGlobalPosition()

    def _storePauseState(self, value):
        if value is None:
            self._client.ui.showDebugMessage("NONE TYPE PAUSE STATE!")
            return
        if self._fileIsLoaded():
            self._paused = value
            #self._client.ui.showDebugMessage("PAUSE STATE STORED AS {}".format(self._paused))
        else:
            self._paused = self._client.getGlobalPaused()
            #self._client.ui.showDebugMessage("STORING GLOBAL PAUSED AS FILE IS NOT LOADED")


    def lineReceived(self, line):
        if line:
            self._client.ui.showDebugMessage("player << {}".format(line))
            line = line.replace("[cplayer] ", "")  # -v workaround
            line = line.replace("[term-msg] ", "")  # -v workaround
            line = line.replace("   cplayer: ", "")  # --msg-module workaround
            line = line.replace("  term-msg: ", "")
        if (
            "Failed to get value of property" in line or
            "=(unavailable)" in line or
            line == "ANS_filename=" or
            line == "ANS_length=" or
            line == "ANS_path="
        ):
            if "filename" in line:
                self._getFilename()
            elif "length" in line:
                self._getLength()
            elif "path" in line:
                self._getFilepath()
            return
        match = self.RE_ANSWER.match(line)
        if not match:
            self._handleUnknownLine(line)
            return

        name, value = [m for m in match.groups() if m]
        name = name.lower()

        if name == self.POSITION_QUERY:
            self._storePosition(float(value))
            self._positionAsk.set()
        elif name == "pause":
            self._storePauseState(bool(value == 'yes'))
            self._pausedAsk.set()
        elif name == "length":
            try:
                self._duration = float(value)
            except:
                self._duration = 0
            self._durationAsk.set()
        elif name == "path":
            self._filepath = value
            self._pathAsk.set()
        elif name == "filename":
            self._filename = value
            self._filenameAsk.set()
        elif name == "exiting":
            if value != 'Quit':
                if self.quitReason is None:
                    self.quitReason = getMessage("media-player-error").format(value)
                self.reactor.callFromThread(self._client.ui.showErrorMessage, self.quitReason, True)
            self.drop()

    def askForStatus(self):
        self._positionAsk.clear()
        self._pausedAsk.clear()
        if not self._listener.isReadyForSend:
            self._client.ui.showDebugMessage("mpv not ready for update")
            return

        self._getPausedAndPosition()
        self._positionAsk.wait(constants.MPV_LOCK_WAIT_TIME)
        self._pausedAsk.wait(constants.MPV_LOCK_WAIT_TIME)
        self._client.updatePlayerStatus(
            self._paused if self.fileLoaded else self._client.getGlobalPaused(), self.getCalculatedPosition())

    def drop(self):
        try:
            self._listener.sendLine(['quit'])
        except AttributeError as e:
            self._client.ui.showDebugMessage("Could not send quit message: {}".format(str(e)))
        self._takeLocksDown()
        self.reactor.callFromThread(self._client.stop, False)

    def _takeLocksDown(self):
        try:
            self._durationAsk.set()
            self._filenameAsk.set()
            self._pathAsk.set()
            self._positionAsk.set()
            self._pausedAsk.set()
        except:
            pass


    def _getPausedAndPosition(self):
        self._listener.sendLine(["script-message-to", "syncplayintf", "get_paused_and_position"])

    def _getPaused(self):
        self._getProperty('pause')

    def _getPosition(self):
        self._getProperty(self.POSITION_QUERY)

    def _sanitizeText(self, text):
        text = text.replace("\r", "")
        text = text.replace("\n", "")
        text = text.replace("\\\"", "<SYNCPLAY_QUOTE>")
        text = text.replace("\"", "<SYNCPLAY_QUOTE>")
        text = text.replace("%", "%%")
        text = text.replace("\\", "\\\\")
        text = text.replace("{", "\\\\{")
        text = text.replace("}", "\\\\}")
        text = text.replace("<SYNCPLAY_QUOTE>", "\\\"")
        return text

    def _quoteArg(self, arg):
        arg = arg.replace('\\', '\\\\')
        arg = arg.replace("'", "\\'")
        arg = arg.replace('"', '\\"')
        arg = arg.replace("\r", "")
        arg = arg.replace("\n", "")
        return '"{}"'.format(arg)

    def _preparePlayer(self):
        if self.delayedFilePath:
            self.openFile(self.delayedFilePath)
        self.setPaused(True)
        self.reactor.callLater(0, self._client.initPlayer, self)

    def _clearFileLoaded(self):
        self.fileLoaded = False
        self.lastLoadedTime = None

    def _loadFile(self, filePath):
        self._clearFileLoaded()
        self._listener.sendLine(['loadfile', filePath], notReadyAfterThis=True)

    def setFeatures(self, featureList):
        self.sendMpvOptions()

    def setPosition(self, value):
        if value < constants.DO_NOT_RESET_POSITION_THRESHOLD and self._recentlyReset():
            self._client.ui.showDebugMessage(
                "Did not seek as recently reset and {} below 'do not reset position' threshold".format(value))
            return
        self._position = max(value, 0)
        self._client.ui.showDebugMessage(
            "Setting position to {}...".format(self._position))
        self._setProperty(self.POSITION_QUERY, "{}".format(value))
        time.sleep(0.03)
        self.lastMPVPositionUpdate = time.time()

    def openFile(self, filePath, resetPosition=False):
        self._client.ui.showDebugMessage("openFile, resetPosition=={}".format(resetPosition))
        if resetPosition:
            self.lastResetTime = time.time()
            if isURL(filePath):
                self._client.ui.showDebugMessage("Setting additional lastResetTime due to stream")
                self.lastResetTime += constants.STREAM_ADDITIONAL_IGNORE_TIME
        self._loadFile(filePath)
        if self._paused != self._client.getGlobalPaused():
            self._client.ui.showDebugMessage("Want to set paused to {}".format(self._client.getGlobalPaused()))
        else:
            self._client.ui.showDebugMessage("Don't want to set paused to {}".format(self._client.getGlobalPaused()))
        if resetPosition == False:
            self._client.ui.showDebugMessage("OpenFile setting position to global position: {}".format(self._client.getGlobalPosition()))
            self.setPosition(self._client.getGlobalPosition())
        else:
            self._storePosition(0)
        # TO TRY: self._listener.setReadyToSend(False)

    def sendMpvOptions(self):
        options = []
        for option in constants.MPV_SYNCPLAYINTF_OPTIONS_TO_SEND:
            options.append("{}={}".format(option, self._client._config[option]))
        for option in constants.MPV_SYNCPLAYINTF_CONSTANTS_TO_SEND:
            options.append(option)
        for option in constants.MPV_SYNCPLAYINTF_LANGUAGE_TO_SEND:
            options.append("{}={}".format(option, getMessage(option)))
        options.append("OscVisibilityChangeCompatible={}".format(constants.MPV_OSC_VISIBILITY_CHANGE_VERSION))
        options_string = ", ".join(options)
        self._listener.sendLine(["script-message-to", "syncplayintf", "set_syncplayintf_options",  options_string])
        self._setOSDPosition()

    def _handleUnknownLine(self, line):
        self.mpvErrorCheck(line)
        if "<chat>" in line:
            line = line.replace(constants.MPV_INPUT_BACKSLASH_SUBSTITUTE_CHARACTER, "\\")
            self._listener.sendChat(line[6:-7])

        if "<eof>" in line:
            self.eofDetected()

        if "<paused=" in line and ", pos=" in line:
            update_string = line.replace(">", "<").replace("=", "<").replace(", ", "<").split("<")
            paused_update = update_string[2]
            position_update = update_string[4]
            if paused_update == "nil":
                self._storePauseState(float(self._client.getGlobalPaused()))
            else:
                self._storePauseState(bool(paused_update == 'true'))
            self._pausedAsk.set()
            if position_update == "nil":
                self._storePosition(float(self._client.getGlobalPosition()))
            else:
                self._storePosition(float(position_update))
            self._positionAsk.set()
            #self._client.ui.showDebugMessage("{} = {} / {}".format(update_string, paused_update, position_update))

        if "<get_syncplayintf_options>" in line:
            self.sendMpvOptions()

        if line == "<SyncplayUpdateFile>" or "Playing:" in line:
            self._client.ui.showDebugMessage("Not ready to send due to <SyncplayUpdateFile>")
            self._listener.setReadyToSend(False)
            self._clearFileLoaded()

        elif line == "</SyncplayUpdateFile>":
            self._onFileUpdate()
            self._listener.setReadyToSend(True)
            self._client.ui.showDebugMessage("Ready to send due to </SyncplayUpdateFile>")

        elif "Failed" in line or "failed" in line or "No video or audio streams selected" in line or "error" in line:
            self._client.ui.showDebugMessage("Not ready to send due to error")
            self._listener.setReadyToSend(True)

    def _setOSDPosition(self):
        if (
            self._client._config['chatMoveOSD'] and (
                self._client._config['chatOutputEnabled'] or (
                    self._client._config['chatInputEnabled'] and
                    self._client._config['chatInputPosition'] == constants.INPUT_POSITION_TOP
                )
            )
        ):
            self._setProperty("osd-align-y", "bottom")
            self._setProperty("osd-margin-y", int(self._client._config['chatOSDMargin']))

    def _recentlyReset(self):
        if not self.lastResetTime:
            return False
        elif time.time() < self.lastResetTime + constants.MPV_NEWFILE_IGNORE_TIME:
            return True
        else:
            return False

    def _onFileUpdate(self):
        self._client.ui.showDebugMessage("File update")
        self.fileLoaded = True
        self.lastLoadedTime = time.time()
        self.reactor.callFromThread(self._client.updateFile, self._filename, self._duration, self._filepath)
        if not (self._recentlyReset()):
            self._client.ui.showDebugMessage("onFileUpdate setting position to global position: {}".format(self._client.getGlobalPosition()))
            self.reactor.callFromThread(self.setPosition, self._client.getGlobalPosition())
        if self._paused != self._client.getGlobalPaused():
            self._client.ui.showDebugMessage("onFileUpdate setting position to global paused: {}".format(self._client.getGlobalPaused()))
            self.reactor.callFromThread(self._client.getGlobalPaused)

    def _fileIsLoaded(self, ignoreDelay=False):
        if ignoreDelay:
            self._client.ui.showDebugMessage("Ignoring _fileIsLoaded MPV_NEWFILE delay")
            return bool(self.fileLoaded)

        return (
            self.fileLoaded and self.lastLoadedTime is not None and
            time.time() > (self.lastLoadedTime + constants.MPV_NEWFILE_IGNORE_TIME)
        )


    def __init__(self, client, playerPath, filePath, args):
        from twisted.internet import reactor
        self.reactor = reactor
        self._client = client
        self._set_defaults()

        self._playerIPCHandler = MPV
        self._create_listener(playerPath, filePath, args)

    def _set_defaults(self):
        self._paused = None
        self._position = 0.0
        self._duration = None
        self._filename = None
        self._filepath = None
        self.quitReason = None
        self.lastLoadedTime = None
        self.fileLoaded = False
        self.delayedFilePath = None

    def _create_listener(self, playerPath, filePath, args):
        try:
            self._listener = self.__Listener(self, self._playerIPCHandler, playerPath, filePath, args)
        except ValueError:
            self._client.ui.showMessage(getMessage("mplayer-file-required-notification"))
            self._client.ui.showMessage(getMessage("mplayer-file-required-notification/example"))
            self.drop()
            return
        except AttributeError as e:
            self._client.ui.showErrorMessage("Could not load mpv: " + str(e))
            return
        self._listener.setDaemon(True)
        self._listener.start()

        self._durationAsk = threading.Event()
        self._filenameAsk = threading.Event()
        self._pathAsk = threading.Event()

        self._positionAsk = threading.Event()
        self._pausedAsk = threading.Event()

        self._preparePlayer()

    def _fileUpdateClearEvents(self):
        self._durationAsk.clear()
        self._filenameAsk.clear()
        self._pathAsk.clear()

    def _fileUpdateWaitEvents(self):
        self._durationAsk.wait()
        self._filenameAsk.wait()
        self._pathAsk.wait()

    def mpv_log_handler(self, level, prefix, text):
        self.lineReceived(text)

    class __Listener(threading.Thread):
        def __init__(self, playerController, playerIPCHandler, playerPath, filePath, args):
            self.playerIPCHandler = playerIPCHandler
            self.playerPath = playerPath
            self.mpv_arguments = playerController.getStartupArgs(args)
            self.mpv_running = True
            self.sendQueue = []
            self.readyToSend = True
            self.lastSendTime = None
            self.lastNotReadyTime = None
            self.__playerController = playerController
            if not self.__playerController._client._config["chatOutputEnabled"]:
                self.__playerController.alertOSDSupported = False
                self.__playerController.chatOSDSupported = False
            if self.__playerController.getPlayerPathErrors(playerPath, filePath):
                raise ValueError()
            if filePath and '://' not in filePath:
                if not os.path.isfile(filePath) and 'PWD' in os.environ:
                    filePath = os.environ['PWD'] + os.path.sep + filePath
                filePath = os.path.realpath(filePath)

            if filePath:
                self.__playerController.delayedFilePath = filePath

            # At least mpv may output escape sequences which result in syncplay
            # trying to parse something like
            # "\x1b[?1l\x1b>ANS_filename=blah.mkv". Work around this by
            # unsetting TERM.
            env = os.environ.copy()
            if 'TERM' in env:
                del env['TERM']
            # On macOS, youtube-dl requires system python to run. Set the environment
            # to allow that version of python to be executed in the mpv subprocess.
            if isMacOS():
                try:
                    env['PATH'] = '/opt/homebrew/bin:/usr/local/bin:/usr/bin'
                    ytdl_path = subprocess.check_output(['which', 'youtube-dl'], text=True, env=env).rstrip('\n')
                    with open(ytdl_path, 'rb') as f:
                        ytdl_shebang = f.readline()
                    ytdl_python = ytdl_shebang.decode('utf-8').lstrip('!#').rstrip('\n')
                    if '/usr/bin/env' in ytdl_python:
                        python_name = ytdl_python.split(' ')[1]
                        python_executable = subprocess.check_output(['which', python_name], text=True, env=env).rstrip('\n')
                    else:
                        python_executable = ytdl_python
                    pythonLibs = subprocess.check_output([python_executable, '-E', '-c',
                                                          'import sys; print(sys.path)'],
                                                          text=True, env=dict())
                    pythonLibs = ast.literal_eval(pythonLibs)
                    pythonPath = ':'.join(pythonLibs[1:])
                except Exception as e:
                    pythonPath = None
                if pythonPath is not None:
                    env['PATH'] = python_executable + ':' + env['PATH']
                    env['PYTHONPATH'] = pythonPath
            try:
                socket = self.mpv_arguments.get('input-ipc-server')
                self.mpvpipe = self.playerIPCHandler(mpv_location=self.playerPath, ipc_socket=socket, loglevel="info", log_handler=self.__playerController.mpv_log_handler, quit_callback=self.stop_client, env=env, **self.mpv_arguments)
            except Exception as e:
                self.quitReason = getMessage("media-player-error").format(str(e)) + " " + getMessage("mpv-failed-advice")
                self.__playerController.reactor.callFromThread(self.__playerController._client.ui.showErrorMessage, self.quitReason, True)
                self.__playerController.drop()
            self.__process = self.mpvpipe
            #self.mpvpipe.show_text("HELLO WORLD!", 1000)
            threading.Thread.__init__(self, name="MPV Listener")

        def __getCwd(self, filePath, env):
            if not filePath:
                return None
            if os.path.isfile(filePath):
                cwd = os.path.dirname(filePath)
            elif 'HOME' in env:
                cwd = env['HOME']
            elif 'APPDATA' in env:
                cwd = env['APPDATA']
            else:
                cwd = None
            return cwd

        def run(self):
            pass

        def sendChat(self, message):
            if message:
                if message[:1] == "/" and message != "/":
                    command = message[1:]
                    if command and command[:1] == "/":
                        message = message[1:]
                    else:
                        self.__playerController.reactor.callFromThread(
                            self.__playerController._client.ui.executeCommand, command)
                        return
                self.__playerController.reactor.callFromThread(self.__playerController._client.sendChat, message)

        def isReadyForSend(self):
            self.checkForReadinessOverride()
            return self.readyToSend

        def setReadyToSend(self, newReadyState):
            oldState = self.readyToSend
            self.readyToSend = newReadyState
            self.lastNotReadyTime = time.time() if newReadyState == False else None
            if self.readyToSend == True:
                self.__playerController._client.ui.showDebugMessage("<mpv> Ready to send: True")
            else:
                self.__playerController._client.ui.showDebugMessage("<mpv> Ready to send: False")
            if self.readyToSend == True and oldState == False:
                self.processSendQueue()

        def checkForReadinessOverride(self):
            if self.lastNotReadyTime and time.time() - self.lastNotReadyTime > constants.MPV_MAX_NEWFILE_COOLDOWN_TIME:
                self.setReadyToSend(True)

        def sendLine(self, line, notReadyAfterThis=None):
            self.checkForReadinessOverride()
            try:
                if self.sendQueue:
                    if constants.MPV_SUPERSEDE_IF_DUPLICATE_COMMANDS:
                        for command in constants.MPV_SUPERSEDE_IF_DUPLICATE_COMMANDS:
                            line_command = " ".join(line)
                            answer = line_command.startswith(command)
                            #self.__playerController._client.ui.showDebugMessage("Does line_command {} start with {}? {}".format(line_command, command, answer))
                            if line_command.startswith(command):
                                for itemID, deletionCandidate in enumerate(self.sendQueue):
                                    if " ".join(deletionCandidate).startswith(command):
                                        self.__playerController._client.ui.showDebugMessage(
                                            "<mpv> Remove duplicate (supersede): {}".format(self.sendQueue[itemID]))
                                        try:
                                            self.sendQueue.remove(self.sendQueue[itemID])
                                        except UnicodeWarning:
                                            self.__playerController._client.ui.showDebugMessage(
                                                "<mpv> Unicode mismatch occurred when trying to remove duplicate")
                                            # TODO: Prevent this from being triggered
                                            pass
                                        break
                            break
                    if constants.MPV_REMOVE_BOTH_IF_DUPLICATE_COMMANDS:
                        for command in constants.MPV_REMOVE_BOTH_IF_DUPLICATE_COMMANDS:
                            if line == command:
                                for itemID, deletionCandidate in enumerate(self.sendQueue):
                                    if deletionCandidate == command:
                                        self.__playerController._client.ui.showDebugMessage(
                                            "<mpv> Remove duplicate (delete both): {}".format(self.sendQueue[itemID]))
                                        self.__playerController._client.ui.showDebugMessage(self.sendQueue[itemID])
                                        return
            except Exception as e:
                self.__playerController._client.ui.showDebugMessage("<mpv> Problem removing duplicates, etc: {}".format(e))
            self.sendQueue.append(line)
            self.processSendQueue()
            if notReadyAfterThis:
                self.setReadyToSend(False)

        def processSendQueue(self):
            while self.sendQueue and self.readyToSend:
                if self.lastSendTime and time.time() - self.lastSendTime < constants.MPV_SENDMESSAGE_COOLDOWN_TIME:
                    self.__playerController._client.ui.showDebugMessage(
                        "<mpv> Throttling message send, so sleeping for {}".format(
                            constants.MPV_SENDMESSAGE_COOLDOWN_TIME))
                    time.sleep(constants.MPV_SENDMESSAGE_COOLDOWN_TIME)
                try:
                    lineToSend = self.sendQueue.pop()
                    if lineToSend:
                        self.lastSendTime = time.time()
                        self.actuallySendLine(lineToSend)
                except IndexError:
                    pass

        def stop_client(self):
            self.readyToSend = False
            try:
                self.mpvpipe.terminate()
            except: #When mpv is already closed
                pass
            self.__playerController._takeLocksDown()
            self.__playerController.reactor.callFromThread(self.__playerController._client.stop, False)

        def actuallySendLine(self, line):
            try:
                self.__playerController._client.ui.showDebugMessage("player >> {}".format(line))
                try:
                    self.mpvpipe.command(*line)
                except Exception as e:
                    self.__playerController._client.ui.showDebugMessage("CANNOT SEND {} DUE TO {}".format(line, e))
                    self.stop_client()
            except IOError:
                pass
