# importing libraries
from PyQt5.QtWidgets import * 
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import * 
from PyQt5.QtCore import * 
import sys
  
  
class Window(QMainWindow):
  
    def __init__(self):
        super().__init__()
  
        # setting title
        self.setWindowTitle("Python ")
  
        # width of window
        self.w_width = 400
  
        # height of window
        self.w_height = 400
  
        # setting geometry
        self.setGeometry(100, 100, self.w_width, self.w_height)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for components
    def UiComponents(self):
  
        # creating head label
        head = QLabel("Percentile Calculator", self)
  
        # setting geometry to the head
        head.setGeometry(0, 10, 400, 60)
  
        # font
        font = QFont('Times', 15)
        font.setBold(True)
        font.setItalic(True)
        font.setUnderline(True)
  
        # setting font to the head
        head.setFont(font)
  
        # setting alignment of the head
        head.setAlignment(Qt.AlignCenter)
  
        # setting color effect to the head
        color = QGraphicsColorizeEffect(self)
        color.setColor(Qt.darkCyan)
        head.setGraphicsEffect(color)
  
        # creating a label
        t_label = QLabel("Total Participants", self)
  
        # setting properties to the  label
        t_label.setAlignment(Qt.AlignCenter)
        t_label.setGeometry(20, 100, 170, 40)
        t_label.setStyleSheet("QLabel"
                              "{"
                              "border : 2px solid black;"
                              "background : rgba(70, 70, 70, 35);"
                              "}")
        t_label.setFont(QFont('Times', 9))
  
        # creating a QLineEdit object to get the total participants
        self.total = QLineEdit(self)
  
        # accepting only number as input
        onlyInt = QIntValidator()
        self.total.setValidator(onlyInt)
  
        # setting properties to the line edit
        self.total.setGeometry(200, 100, 180, 40)
        self.total.setAlignment(Qt.AlignCenter)
        self.total.setFont(QFont('Times', 9))
  
        # creating a rank label
        r_label = QLabel("Rank ", self)
  
        # setting properties to the label
        r_label.setAlignment(Qt.AlignCenter)
        r_label.setGeometry(20, 150, 170, 40)
        r_label.setStyleSheet("QLabel"
                              "{"
                              "border : 2px solid black;"
                              "background : rgba(70, 70, 70, 35);"
                              "}")
        r_label.setFont(QFont('Times', 9))
  
        # creating a QLineEdit object to get the rank
        self.rank = QLineEdit(self)
  
        # accepting only number as input
        onlyInt = QIntValidator()
        self.rank.setValidator(onlyInt)
  
        # setting properties to the line edit
        self.rank.setGeometry(200, 150, 180, 40)
        self.rank.setAlignment(Qt.AlignCenter)
        self.rank.setFont(QFont('Times', 9))
  
  
        # creating a push button
        calculate = QPushButton("Calculate Percentile", self)
  
        # setting geometry to the push button
        calculate.setGeometry(125, 220, 150, 40)
  
        # adding action to the calculate button
        calculate.clicked.connect(self.calculate_action)
  
        # creating a label to show percentile
        self.result = QLabel(self)
  
        # setting properties to result label
        self.result.setAlignment(Qt.AlignCenter)
        self.result.setGeometry(50, 300, 300, 60)
        self.result.setStyleSheet("QLabel"
                                  "{"
                                  "border : 3px solid black;"
                                  "background : white;"
                                  "}")
        self.result.setFont(QFont('Arial', 11))
  
  
    def calculate_action(self):
  
  
        # getting total number of students
        students = self.total.text()
  
        # getting rank
        rank = self.rank.text()
  
        # if no input is given close the function
        if len(students) == 0 or len(rank) == 0:
            return
  
        # converting students into integer
        students = int(students)
  
        # converting rank into integer
        rank = int(rank)
  
        # if user enter total value as 0
        # return the function
        if students == 0 or rank == 0:
            return
  
        # variable to store the result upto 3
        # decimal points
        result = round((students - rank) / students * 100, 3)
  
        # setting text to the result label
        self.result.setText("Percentile : " + str(result))
  
  
    # create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())