import sys, io, os
from PyQt4 import QtCore, QtGui, uic
from PyQt4.QtGui import QPainter, QColor, QFont
from os.path import expanduser
import subprocess as sp
import numpy
from PIL import Image, ImageDraw, ImageFont
from PIL.ImageQt import ImageQt
import atexit
from queue import Queue
from PyQt4.QtCore import QSettings

import preview_thread, core

class Main(QtCore.QObject):

  newTask = QtCore.pyqtSignal(str, str, QFont)
  processTask = QtCore.pyqtSignal()

  def __init__(self, window):

    QtCore.QObject.__init__(self)

    # print('main thread id: {}'.format(QtCore.QThread.currentThreadId()))
    self.window = window
    self.core = core.Core()

    self.settings = QSettings('settings.ini', QSettings.IniFormat)

    self.previewQueue = Queue()

    self.previewThread = QtCore.QThread(self)
    self.previewWorker = preview_thread.Worker(self, self.previewQueue)

    self.previewWorker.moveToThread(self.previewThread)
    self.previewWorker.imageCreated.connect(self.showPreviewImage)
    
    self.previewThread.start()

    self.timer = QtCore.QTimer(self)
    self.timer.timeout.connect(self.processTask.emit)
    self.timer.start(500)
    
    window.pushButton_selectInput.clicked.connect(self.openInputFileDialog)
    window.pushButton_selectOutput.clicked.connect(self.openOutputFileDialog)
    window.pushButton_createVideo.clicked.connect(self.createAudioVisualisation)
    window.pushButton_selectBackground.clicked.connect(self.openBackgroundFileDialog)

    window.fontComboBox.currentFontChanged.connect(self.drawPreview)
    window.lineEdit_title.textChanged.connect(self.drawPreview)

    window.progressBar_create.setValue(0)
    window.setWindowTitle("Audio Visualizer")
    window.pushButton_selectInput.setText("Select Input Music File")
    window.pushButton_selectOutput.setText("Select Output Video File")
    window.pushButton_selectBackground.setText("Select Background Image")
    window.label_font.setText("Title Font")
    window.label_title.setText("Title Text")
    window.pushButton_createVideo.setText("Create Video")
    window.groupBox_create.setTitle("Create")
    window.groupBox_settings.setTitle("Settings")
    window.groupBox_preview.setTitle("Preview")

    titleFont = self.settings.value("titleFont")
    if not titleFont == None: 
      window.fontComboBox.setCurrentFont(QFont(titleFont))

    self.drawPreview()

    window.show()

  def cleanUp(self):
    self.timer.stop()
    self.previewThread.quit()
    self.previewThread.wait()

    self.settings.setValue("titleFont", self.window.fontComboBox.currentFont().toString())

  def openInputFileDialog(self):
    inputDir = self.settings.value("inputDir", expanduser("~"))

    fileName = QtGui.QFileDialog.getOpenFileName(self.window,
       "Open Music File", inputDir, "Music Files (*.mp3 *.wav *.ogg *.flac)");

    if not fileName == "": 
      self.settings.setValue("inputDir", os.path.dirname(fileName))
      self.window.label_input.setText(fileName)

  def openOutputFileDialog(self):
    outputDir = self.settings.value("outputDir", expanduser("~"))

    fileName = QtGui.QFileDialog.getSaveFileName(self.window,
       "Set Output Video File", outputDir, "Video Files (*.mp4)");

    if not fileName == "": 
      self.settings.setValue("outputDir", os.path.dirname(fileName))
      self.window.label_output.setText(fileName)

  def openBackgroundFileDialog(self):
    backgroundDir = self.settings.value("backgroundDir", expanduser("~"))

    fileName = QtGui.QFileDialog.getOpenFileName(self.window,
       "Open Background Image", backgroundDir, "Image Files (*.jpg *.png)");

    if not fileName == "": 
      self.settings.setValue("backgroundDir", os.path.dirname(fileName))
      self.window.label_background.setText(fileName)
    self.drawPreview()

  def createAudioVisualisation(self):

    imBackground = self.core.drawBaseImage(
      self.window.label_background.text(),
      self.window.lineEdit_title.text(),
      self.window.fontComboBox.currentFont())

    self.window.progressBar_create.setValue(0)
    
    completeAudioArray = self.core.readAudioFile(self.window.label_input.text())

    out_pipe = sp.Popen([ self.core.FFMPEG_BIN,
       '-y', # (optional) means overwrite the output file if it already exists.
       '-f', 'rawvideo',
       '-vcodec', 'rawvideo',
       '-s', '1280x720', # size of one frame
       '-pix_fmt', 'rgb24',
       '-r', '30', # frames per second
       '-i', '-', # The input comes from a pipe
       '-an',
       '-i', self.window.label_input.text(),
       '-acodec', "libmp3lame", # output audio codec
       self.window.label_output.text()],
        stdin=sp.PIPE,stdout=sp.DEVNULL, stderr=sp.DEVNULL)

    smoothConstantDown = 0.08
    smoothConstantUp = 0.8
    lastSpectrum = None
    progressBarValue = 0
    sampleSize = 1470

    numpy.seterr(divide='ignore')

    for i in range(0, len(completeAudioArray), sampleSize):
      # create video for output
      lastSpectrum = self.core.transformData(
        i,
        completeAudioArray,
        sampleSize,
        smoothConstantDown,
        smoothConstantUp,
        lastSpectrum)
      im = self.core.drawBars(lastSpectrum, imBackground)

      # write to out_pipe
      try:
        out_pipe.stdin.write(im.tostring())
      finally:
        True

      # increase progress bar value
      if progressBarValue + 1 <= (i / len(completeAudioArray)) * 100:
        progressBarValue = numpy.floor((i / len(completeAudioArray)) * 100)
        self.window.progressBar_create.setValue(progressBarValue)

    numpy.seterr(all='print')

    out_pipe.stdin.close()
    if out_pipe.stderr is not None:
      print(out_pipe.stderr.read())
      out_pipe.stderr.close()
    out_pipe.terminate()
    out_pipe.wait()
    print("Video file created")
    self.window.progressBar_create.setValue(100)

  def drawPreview(self):
    self.newTask.emit(self.window.label_background.text(),
      self.window.lineEdit_title.text(),
      self.window.fontComboBox.currentFont())
    # self.processTask.emit()

  def showPreviewImage(self, image):
    self._scaledPreviewImage = image
    self._previewPixmap = QtGui.QPixmap.fromImage(self._scaledPreviewImage)

    self.window.label_preview.setPixmap(self._previewPixmap)

if __name__ == "__main__":
  app = QtGui.QApplication(sys.argv)
  window = uic.loadUi("main.ui")
  
  main = Main(window)

  atexit.register(main.cleanUp)

  sys.exit(app.exec_())