from owrx.modes import Modes, AudioChopperMode
from csdr.output import Output
from itertools import groupby
import threading
from owrx.audio import ProfileSourceSubscriber
from owrx.audio.wav import AudioWriter
from multiprocessing.connection import Pipe, wait

import logging

logger = logging.getLogger(__name__)
logger.setLevel(logging.INFO)


class AudioChopper(threading.Thread, Output, ProfileSourceSubscriber):
    def __init__(self, active_dsp, mode_str: str):
        self.read_fn = None
        self.doRun = True
        self.dsp = active_dsp
        self.writers = []
        mode = Modes.findByModulation(mode_str)
        if mode is None or not isinstance(mode, AudioChopperMode):
            raise ValueError("Mode {} is not an audio chopper mode".format(mode_str))
        self.profile_source = mode.get_profile_source()
        (self.outputReader, self.outputWriter) = Pipe()
        super().__init__()

    def stop_writers(self):
        while self.writers:
            self.writers.pop().stop()

    def setup_writers(self):
        self.stop_writers()
        sorted_profiles = sorted(self.profile_source.getProfiles(), key=lambda p: p.getInterval())
        groups = {interval: list(group) for interval, group in groupby(sorted_profiles, key=lambda p: p.getInterval())}
        writers = [AudioWriter(self.dsp, self.outputWriter, interval, profiles) for interval, profiles in groups.items()]
        for w in writers:
            w.start()
        self.writers = writers

    def supports_type(self, t):
        return t == "audio"

    def receive_output(self, t, read_fn):
        self.read_fn = read_fn
        self.start()

    def run(self) -> None:
        logger.debug("Audio chopper starting up")
        self.setup_writers()
        self.profile_source.subscribe(self)
        while self.doRun:
            data = None
            try:
                data = self.read_fn(256)
            except ValueError:
                pass
            if data is None or (isinstance(data, bytes) and len(data) == 0):
                self.doRun = False
            else:
                for w in self.writers:
                    w.write(data)

        logger.debug("Audio chopper shutting down")
        self.profile_source.unsubscribe(self)
        self.stop_writers()
        self.outputWriter.close()
        self.outputWriter = None

        # drain messages left in the queue so that the queue can be successfully closed
        # this is necessary since python keeps the file descriptors open otherwise
        try:
            while True:
                self.outputReader.recv()
        except EOFError:
            pass
        self.outputReader.close()
        self.outputReader = None

    def onProfilesChanged(self):
        logger.debug("profile change received, resetting writers...")
        self.setup_writers()

    def read(self):
        try:
            return self.outputReader.recv()
        except (EOFError, OSError):
            return None