#!/usr/bin/python
# -*- coding: utf-8 -*-

import sys,time
from PyQt4 import QtGui, QtCore

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

        self.setWindowTitle('Constant length')
        title = QtGui.QLabel('Make all events of length:')
        self.titleEdit = QtGui.QComboBox()
        self.titleEdit.addItem('1/1',1)
        self.titleEdit.addItem('1/2',2)
        self.titleEdit.addItem('1/4',4)
        self.titleEdit.addItem('1/8',8)
        self.titleEdit.addItem('1/16',16)
        self.titleEdit.addItem('1/32',32)
        self.titleEdit.addItem('1/64',64)
        self.titleEdit.setCurrentIndex(4)

        button = QtGui.QPushButton("Execute")
        self.connect(button,  QtCore.SIGNAL('clicked()'), self.execute) 
        grid = QtGui.QGridLayout()
        grid.setSpacing(3)

        grid.addWidget(title, 1, 0)
        grid.addWidget(self.titleEdit, 1, 1)

        grid.addWidget(button, 2, 1)

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

    def execute(self):
        testFile = file(sys.argv[1],"r")
        inputEvents = testFile.readlines()
        testFile.close()

        beatDiv = self.titleEdit.itemData(self.titleEdit.currentIndex()).toInt()[0]
        print "beatDiv=",beatDiv
        eventLen=0
        #get beat length to calculate minimum length of event
        for line in inputEvents:
            if line.startswith('BEATLEN'):
              tag,tick = line.split(' ')
              eventLen=int(tick)/beatDiv*4
              break
        
        outputEvents=[]
        #loop through events
        for line in inputEvents:
            
            if line.startswith('NOTE'):
              tag,tick,note,length,velocity = line.split(' ')

              length=eventLen
              newLine=tag+" "+tick+" "+note+" "+str(length)+" "+velocity
              outputEvents.append(newLine)
                
            else:
              outputEvents.append(line)
            
        testFile = file(sys.argv[1],"w")
        testFile.writelines(outputEvents)
        testFile.close()
        
        quit()



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