import sys
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtGui import QColor
from PyQt5.QtCore import Qt, QEvent, QObject
import random

class UserInputClass(QtWidgets.QLineEdit):
    def __init__(self):
        QtWidgets.QLineEdit.__init__(self)

    def keyPressEvent(self, keyEvent):
        super(UserInputClass, self).keyPressEvent(keyEvent)
        if keyEvent.key() == Qt.Key_Backspace:
            print('Backspace pressed')


class Ui_MainWindow(QtWidgets.QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle("TypeJam")
        self.centralwidget = QtWidgets.QWidget(self)
        self.setCentralWidget(self.centralwidget)
        self.gridLayout = QtWidgets.QGridLayout(self.centralwidget)
        self.setGeometry(300, 300, 800, 500)
        self.initUserInput()
        self.initTextForTyping()
        self.initButtons()
        self.addLayouts()
        self.inputProcessing()

    def initTextForTyping(self):
        self.textForTyping = QtWidgets.QTextEdit(self)
        self.textForTyping.setGeometry(30, 30, 580, 280)
        fontTextForTyping = QtGui.QFont()
        fontTextForTyping.setFamily("Arial")
        fontTextForTyping.setPointSize(20)
        self.textForTyping.setFont(fontTextForTyping)
        self.textForTyping.setReadOnly(True)
        self.textForTyping.setText(self.GetTextFromFile())
        self.str_textForTyping = self.textForTyping.toPlainText()

    def initUserInput(self):
        self.userInput = UserInputClass()
        self.userInput.setGeometry(30, 320, 580, 40)
        fontUserInput = QtGui.QFont()
        fontUserInput.setFamily("Arial")
        fontUserInput.setPointSize(20)
        self.userInput.setFont(fontUserInput)
        self.str_userInput = str()
        self.userInput.textChanged.connect(self.inputProcessing)
        # self.userInput.returnPressed.connect(self.backspace)
        # self.kpa = self.KeyPressEater()
        # self.userInput.installEventFilter(self.kpa)

    def initButtons(self):
        self.buttonStart = QtWidgets.QPushButton("Start", self)
        self.buttonStop = QtWidgets.QPushButton("Stop", self)

    def addLayouts(self):
        self.gridLayout.addWidget(self.textForTyping, 0, 0, 1, 1)
        self.gridLayout.addWidget(self.userInput, 1, 0, 1, 1)
        self.verticalLayout = QtWidgets.QVBoxLayout()
        self.verticalLayout.addWidget(self.buttonStart)
        self.verticalLayout.addWidget(self.buttonStop)
        self.spacerItem = QtWidgets.QSpacerItem(20, 40, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)
        self.verticalLayout.addItem(self.spacerItem)
        self.gridLayout.addLayout(self.verticalLayout, 0, 1)

    def GetTextFromFile(self):
        textfile = open("text.txt", "r")
        self.TextFromFile = textfile.read()
        textfile.close()
        return self.TextFromFile

    # class KeyPressEater(QObject):
    #     def eventFilter(self, obj, event):
    #         if event.type() == QEvent.KeyPress:
    #             print("Ate key press", event.key())
    #             return True
    #         else:
    #             # standard event processing
    #             return QObject.eventFilter(self, obj, event)

    # def eventFilter(self, obj, event):
    #     if obj == self.userInput:
    #         if event.type() == QEvent.KeyPress:
    #             print ("Ate key press", event.key())
    #             return True
    #         else:
    #             return False
    #     else:
    #         return QtWidgets.QMainWindow.eventFilter(self, obj, event)
    # def keyPressEvent(self, event):
    #     if event.key() == Qt.Key_Backspace:
    #         print("back")

    # def backspace(self):
    #     print("backback")

    # def keyPressEvent(self, QKeyEvent):
    #     if QKeyEvent.key() == Qt.Key_Backspace:
    #         print("backspace")

    def inputProcessing(self):
        current_userInput = self.userInput.text()
        if len((self.userInput.text())) != 0:
            lastSymbol = self.userInput.text()[len(self.userInput.text()) - 1]
            numberOfRight = 1
            if self.str_textForTyping.find(self.str_userInput + lastSymbol) == 0:
                self.str_userInput += lastSymbol
                numberOfRight += 1
            else:
                # self.textForTyping.setStyleSheet("background: rgb(120,120,120)")
                print(self.str_userInput)

        if " " in self.userInput.text():
            self.userInput.clear()



if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    ui = Ui_MainWindow()
    ui.show()

    sys.exit(app.exec_())