#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# MusE external midi processing script
# By: Robert Jonsson 2009
# Quantize
#=============================================================================
#  MusE
#  Linux Music Editor
#  $Id:$
#
#  Copyright (C) 2002-2011 by Werner Schweer and others
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License
#  as published by the Free Software Foundation; either version 2
#  of the License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the
#  Free Software Foundation, Inc.,
#  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#=============================================================================


import sys,time
from PyQt5.QtWidgets import QApplication, QWidget, QComboBox, QLineEdit, QPushButton, QGridLayout, QLabel
import random

class Quantize(QWidget):
    def __init__(self, parent=None):
        QWidget.__init__(self, parent)

        self.setWindowTitle('Swing quantize V1')

        
        self.beatEdit = QComboBox()
        self.beatEdit.addItem('1/1',1)
        self.beatEdit.addItem('1/2',2)
        self.beatEdit.addItem('1/4',4)
        self.beatEdit.addItem('1/8',8)
        self.beatEdit.addItem('1/16',16)
        self.beatEdit.addItem('1/32',32)
        self.beatEdit.setCurrentIndex(2)
        self.spreadEdit = QLineEdit()
        self.spreadEdit.setText('10')
        
        button = QPushButton("Execute")
        button.clicked.connect(self.execute)

        grid = QGridLayout()
        grid.setSpacing(3)

        grid.addWidget(QLabel('Beat granularity:'), 1, 0)
        grid.addWidget(self.beatEdit, 1, 1)
        grid.addWidget(QLabel('Spread/Swing(ticks)'), 2, 0)
        grid.addWidget(self.spreadEdit, 2, 1)
        grid.addWidget(button, 3, 1)

        self.setLayout(grid)
        self.resize(200, 100)
        button.setFocus()

    def execute(self):
        testFile = open(sys.argv[1],"r")
        inputEvents = testFile.readlines()
        testFile.close()
        random.seed()
        
        beatDiv = self.beatEdit.itemData(self.beatEdit.currentIndex())
        minSize=0 # fill in when we get the beat size value
        outputEvents=[]
        quantLen=0

        #get beat length to calculate minimum length of event
        for line in inputEvents:
            if line.startswith('BEATLEN'):
              tag,tick = line.split(' ')
              beatLen=int(tick)
              quantLen=int(tick)/beatDiv*4
              print ("quantLen=%d beatDiv=%d"%(quantLen, beatDiv))
            print (line.strip())
        #loop through events and quantize to the given beat
        eventList=[]
        for line in inputEvents:
            if line.startswith('NOTE'):
              tag,tick,pitch,length,velocity = line.split(' ')

              # over quantize
              lowerBound=(int(tick)/quantLen)*quantLen
              upperBound=lowerBound+quantLen
              lowDiff=int(tick)-lowerBound
              highDiff=upperBound - int(tick)
              if( lowDiff < highDiff):
                newTick=lowerBound
              else:
                newTick=upperBound

              # apply swing factor to every other 8 beat
              print ("float =%f int = %d"%((float(newTick+beatLen)) / beatLen/2,((newTick+beatLen))/beatLen/2))
              if  ((float(newTick+beatLen)) / beatLen/2 - ((newTick+beatLen))/beatLen/2) < 0.1:
                  print ("adding swing to:",newTick)
                  newTick=int(random.gauss(newTick,int(self.spreadEdit.text())))
                  if (newTick < 0):
                    newTick=0

              newLine="NOTE "+ str(newTick)+" " + pitch  + " "+ length + " " + velocity
              print ("newLine:",newLine.strip())
              outputEvents.append(newLine)
            else:
              outputEvents.append(line)
            


        testFile = open(sys.argv[1],"w")
        testFile.writelines(outputEvents)
        testFile.close()

        quit()


app = QApplication(sys.argv)
qb = Quantize()
qb.show()
sys.exit(app.exec_())
