import pyaudio
import logging
import audioop
import wave
import time
import os
import chunk
from _struct import pack
from array import array

mainLogger = logging.getLogger("hugvey")
logger = mainLogger.getChild("recorder")

class Recorder:
    """
    Record the streamed audio
    """

    def __init__(self, hv_id, src_rate, out_folder):
        self.logger = mainLogger.getChild(f"{hv_id}").getChild('recorder')
        
        if not os.path.exists(out_folder):
            raise Exception(f"Invalid output folder for recordings: {out_folder}")

        self.hv_id = hv_id
        self.src_rate = src_rate
        self.main_folder = out_folder # unfortunately not every device plays 16kHz audio streams
        self.running = False
        
    def start(self):
        self.subsequentMutedFrames = 0
        self.fragmentNr = 0
        
        self.data = array('h')
        self.currentTranscription = ""
        
        t = time.strftime("%Y%m%d-%H%M%s")
        
        self.out_folder = os.path.join(self.main_folder, f"{self.hv_id}", t)
        if not os.path.exists(self.out_folder):
            self.logger.debug(f"Create directory {self.out_folder}")
            self.target_folder = os.makedirs(self.out_folder, exist_ok=True)
        
        self.running = True
    
    
    def writeData(self):
        if len(self.data) < 1:
            self.logger.info("Skip empty wave creation")
            return
            
        self.fragmentNr += 1
        
        fn = os.path.join(self.out_folder, f"{self.fragmentNr}.wav")
        
        self.logger.info(f"Write wave: {fn}")
        
        self.wf = wave.open(fn, 'wb')
        self.wf.setnchannels(1)
        self.wf.setsampwidth(2)
        self.wf.setframerate(self.src_rate)
        # adapted from https://stackoverflow.com/questions/892199/detect-record-audio-in-python#6743593
        self.wf.writeframes(pack('<' + ('h'*len(self.data)), *self.data))
        self.wf.close()
        
        with open(os.path.join(self.out_folder, "transcriptions.txt"), "a") as fp:
            fp.write(f"{self.fragmentNr}\t{self.currentTranscription}\n")
        self.log('-',self.currentTranscription)
        
        self.data = array('h')
        self.currentTranscription = ""
    
    def receive(self, chunk):
        if not self.running:
            return 
        
#           self.logger.debug('receive {}'.format(len(chunk)))
        if audioop.max(chunk, 2) == 0:
            # mic is muted on client side.
            
            self.subsequentMutedFrames += 1
            #self.logger.debug(f"Empty frame {self.subsequentMutedFrames}")
            if self.subsequentMutedFrames == 4:
#                 self.createWave()
                self.writeData()
            if self.subsequentMutedFrames > 4:
#                 Don't write more muted frames to the audio file.
                return
        else:
            self.subsequentMutedFrames = 0
        
        d = array('h', chunk)
        self.data.extend(d)
#         self.wf.writeframes(chunk)
    
    def shutdown(self):
        self.writeData()
        self.running = False
#         self.wf.close()
    
    def triggerStart(self):
        self.start()

    def updateTranscription(self, text):
        self.currentTranscription = text
        
    def log(self, origin, msg):
        with open(os.path.join(self.out_folder, "log.txt"), "a") as fp:
            fp.write(f"{origin}: {msg}\n")