# This is the player. Reliability is critical here, so we're catching
# literally every exception possible and handling it.

# It is key that whenever the parent server tells us to do something
# that we respond with something, FAIL or OKAY. The server doesn't like to be kept waiting.

from queue import Empty
import multiprocessing
import setproctitle
import copy
import json
import time
import sys
# Stop the Pygame Hello message.
import os
os.environ['PYGAME_HIDE_SUPPORT_PROMPT'] = "hide"
from pygame import mixer
from mutagen.mp3 import MP3

from helpers.state_manager import StateManager
from helpers.logging_manager import LoggingManager

class Player():
    state = None
    running = False
    out_q = None
    last_msg = None
    logger = None

    __default_state = {
        "initialised": False,
        "filename": "",
        "channel": -1,
        "playing": False,
        "paused": False,
        "loaded": False,
        "pos": 0,
        "pos_offset": 0,
        "pos_true": 0,
        "remaining": 0,
        "length": 0,
        "loop": False,
        "output": None
    }

    __rate_limited_params = [
        "pos",
        "pos_offset",
        "pos_true",
        "remaining"
    ]

    @property
    def isInit(self):
        try:
            mixer.music.get_busy()
        except:
            return False

        return True

    @property
    def isPlaying(self):
        if self.isInit:
            return (not self.isPaused) and bool(mixer.music.get_busy())
        return False

    @property
    def isPaused(self):
        return self.state.state["paused"]

    @property
    def isLoaded(self):
        if not self.state.state["filename"]:
            return False
        if self.isPlaying:
            return True

        # Because Pygame/SDL is annoying
        # We're not playing now, so we can quickly test run
        # If that works, we're loaded.
        try:
            position = self.state.state["pos"]
            mixer.music.set_volume(0)
            mixer.music.play(0)
        except:
            try:
                mixer.music.set_volume(1)
            except:
                self.logger.log.exception("Failed to reset volume after attempting loaded test.")
                pass
            return False
        if position > 0:
            self.pause()
        else:
            self.stop()
        mixer.music.set_volume(1)
        return True

    @property
    def status(self):
        res = json.dumps(self.state.state)
        return res

    def play(self, pos=0):
        try:
            mixer.music.play(0, pos)
            self.state.update("pos_offset", pos)
        except:
            self.logger.log.exception("Failed to play at pos: " + str(pos))
            return False
        self.state.update("paused", False)
        return True

    def pause(self):
        try:
            mixer.music.pause()
        except:
            self.logger.log.exception("Failed to pause.")
            return False
        self.state.update("paused", True)
        return True

    def unpause(self):
        if not self.isPlaying:
            position = self.state.state["pos_true"]
            try:
                self.play(position)
            except:
                self.logger.log.exception("Failed to unpause from pos: " + str(position))
                return False
            self.state.update("paused", False)
            return True
        return False

    def stop(self):
        # if self.isPlaying or self.isPaused:
        try:
            mixer.music.stop()
        except:
            self.logger.log.exception("Failed to stop playing.")
            return False
        self.state.update("pos", 0)
        self.state.update("pos_offset", 0)
        self.state.update("pos_true", 0)
        self.state.update("paused", False)
        return True
        # return False

    def seek(self, pos):
        if self.isPlaying:
            try:
                self.play(pos)
            except:
                self.logger.log.exception("Failed to seek to pos: " + str(pos))
                return False
            return True
        else:
            self.state.update("paused", True)
            self._updateState(pos=pos)
        return True

    def load(self, filename):
        if not self.isPlaying:
            self.unload()
            # Fix any OS specific / or \'s
            if os.path.sep == "/":
                filename = filename.replace("\\", '/')
            else:
                filename = filename.replace("/", '\\')

            self.state.update("filename", filename)

            try:
                self.logger.log.info("Loading file: " + str(filename))
                mixer.music.load(filename)
            except:
                # We couldn't load that file.
                self.logger.log.exception("Couldn't load file: " + str(filename))
                return False

            try:
                if ".mp3" in filename:
                    song = MP3(filename)
                    self.state.update("length", song.info.length)
                else:
                    self.state.update("length", mixer.Sound(filename).get_length()/1000)
            except:
                self.logger.log.exception("Failed to update the length of item.")
                return False
        return True

    def unload(self):
        if not self.isPlaying:
            try:
                mixer.music.unload()
                self.state.update("paused", False)
                self.state.update("filename", "")
            except:
                self.logger.log.exception("Failed to unload channel.")
                return False
        return not self.isLoaded

    def quit(self):
        try:
            mixer.quit()
            self.state.update("paused", False)
        except:
            self.logger.log.exception("Failed to quit mixer.")

    def output(self, name=None):
        wasPlaying = self.state.state["playing"]
        self.quit()
        self.state.update("output", name)
        try:
            if name:
                mixer.init(44100, -16, 2, 1024, devicename=name)
            else:
                mixer.init(44100, -16, 2, 1024)
        except:
            self.logger.log.exception("Failed to init mixer with device name: " + str(name))
            return False

        self.load(self.state.state["filename"])

        if wasPlaying:
            self.unpause()

        return True

    def _updateState(self, pos=None):

        self.state.update("initialised", self.isInit)
        if self.isInit:
            if (pos):
                self.state.update("pos", max(0, pos))
            elif self.isPlaying:
                # Get one last update in, incase we're about to pause/stop it.
                self.state.update("pos", max(0, mixer.music.get_pos()/1000))
            self.state.update("playing", self.isPlaying)
            self.state.update("loaded", self.isLoaded)



            self.state.update("pos_true", self.state.state["pos"] + self.state.state["pos_offset"])

            self.state.update("remaining", self.state.state["length"] - self.state.state["pos_true"])

    def _retMsg(self, msg, okay_str=False):
        response = self.last_msg + ":"
        if msg == True:
            response += "OKAY"
        elif isinstance(msg, str):
            if okay_str:
                response += "OKAY:" + msg
            else:
                response += "FAIL:" + msg
        else:
            response += "FAIL"
        if self.out_q:
            self.out_q.put(response)

    def __init__(self, channel, in_q, out_q):

        process_title = "Player: Channel " + str(channel)
        setproctitle.setproctitle(process_title)
        multiprocessing.current_process().name = process_title

        self.running = True
        self.out_q = out_q

        self.logger = LoggingManager("channel" + str(channel))

        self.state = StateManager("channel" + str(channel), self.logger, self.__default_state, self.__rate_limited_params)
        self.state.update("channel", channel)

        loaded_state = copy.copy(self.state.state)

        if loaded_state["output"]:
            self.logger.log.info("Setting output to: " + loaded_state["output"])
            self.output(loaded_state["output"])
        else:
            self.logger.log.info("Using default output device.")
            self.output()

        if loaded_state["filename"]:
            self.logger.log.info("Loading filename: " + loaded_state["filename"])
            self.load(loaded_state["filename"])

            if loaded_state["pos_true"] != 0:
                self.logger.log.info("Seeking to pos_true: " + str(loaded_state["pos_true"]))
                self.seek(loaded_state["pos_true"])

            if loaded_state["playing"] == True:
                self.logger.log.info("Resuming.")
                self.unpause()
        else:
            self.logger.log.info("No file was previously loaded.")

        while self.running:
            time.sleep(0.1)
            self._updateState()
            try:
                try:
                    self.last_msg = in_q.get_nowait()
                except Empty:
                    # The incomming message queue was empty,
                    # skip message processing
                    pass
                else:

                    # We got a message.

                    # Output re-inits the mixer, so we can do this any time.
                    if (self.last_msg.startswith("OUTPUT")):
                        split = self.last_msg.split(":")
                        self._retMsg(self.output(split[1]))

                    elif self.isInit:

                        if (self.last_msg == 'LOADED?'):
                            self._retMsg(self.isLoaded)
                            continue

                        elif (self.last_msg == 'PLAY'):
                            self._retMsg(self.play())

                        elif (self.last_msg == 'PAUSE'):
                            self._retMsg(self.pause())

                        elif (self.last_msg == 'UNPAUSE'):
                            self._retMsg(self.unpause())

                        elif (self.last_msg == 'STOP'):
                            self._retMsg(self.stop())

                        elif (self.last_msg == 'QUIT'):
                            self.running = False
                            continue

                        elif (self.last_msg.startswith("SEEK")):
                            split = self.last_msg.split(":")
                            self._retMsg(self.seek(float(split[1])))

                        elif (self.last_msg.startswith("LOAD")):
                            split = self.last_msg.split(":")
                            self._retMsg(self.load(split[1]))

                        elif (self.last_msg == 'UNLOAD'):
                            self._retMsg(self.unload())

                        elif (self.last_msg == 'STATUS'):
                            self._retMsg(self.status, True)

                        else:
                            self._retMsg("Unknown Command")
                    else:
                        if (self.last_msg == 'STATUS'):
                            self._retMsg(self.status)
                        else:
                            self._retMsg(False)

            # Catch the player being killed externally.
            except KeyboardInterrupt:
                self.logger.log.info("Received KeyboardInterupt")
                break
            except SystemExit:
                self.logger.log.info("Received SystemExit")
                break
            except:
                self.logger.log.exception("Received unexpected exception.")
                break

        self.logger.log.info("Quiting player ", channel)
        self.quit()
        self._retMsg("EXIT")
        sys.exit(0)


def showOutput(in_q, out_q):
    print("Starting showOutput().")
    while True:
        time.sleep(0.01)
        last_msg = out_q.get()
        print(last_msg)


if __name__ == "__main__":
    if isMacOS:
        multiprocessing.set_start_method("spawn", True)

    in_q = multiprocessing.Queue()
    out_q = multiprocessing.Queue()

    outputProcess = multiprocessing.Process(
        target=showOutput,
        args=(in_q, out_q),
    ).start()

    playerProcess = multiprocessing.Process(
        target=Player,
        args=(-1, in_q, out_q),
    ).start()

    # Do some testing
    in_q.put("LOADED?")
    in_q.put("PLAY")
    in_q.put("LOAD:\\Users\\matth\\Documents\\GitHub\\bapsicle\\dev\\test.mp3")
    in_q.put("LOADED?")
    in_q.put("PLAY")
    print("Entering infinite loop.")
    while True:
        pass