---

from PyQt6 import QtCore, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(500, 500)
        self.pushButton = QtWidgets.QPushButton(parent=Form)
        self.pushButton.setGeometry(QtCore.QRect(20, 170, 113, 32))
        self.pushButton.setObjectName("pushButton")
        self.widget = QtWidgets.QWidget(parent=Form)
        self.widget.setGeometry(QtCore.QRect(20, 60, 123, 83))
        self.widget.setObjectName("widget")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.widget)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setObjectName("verticalLayout")
        self.checkBox = QtWidgets.QCheckBox(parent=self.widget)
        self.checkBox.setObjectName("checkBox")
        self.verticalLayout.addWidget(self.checkBox)
        self.checkBox_2 = QtWidgets.QCheckBox(parent=self.widget)
        self.checkBox_2.setObjectName("checkBox_2")
        self.verticalLayout.addWidget(self.checkBox_2)
        self.checkBox_3 = QtWidgets.QCheckBox(parent=self.widget)
        self.checkBox_3.setObjectName("checkBox_3")
        self.verticalLayout.addWidget(self.checkBox_3)
        self.checkBox_4 = QtWidgets.QCheckBox(parent=self.widget)
        self.checkBox_4.setObjectName("checkBox_4")
        self.verticalLayout.addWidget(self.checkBox_4)
        self.widget1 = QtWidgets.QWidget(parent=Form)
        self.widget1.setGeometry(QtCore.QRect(20, 10, 400, 31))
        self.widget1.setObjectName("widget1")
        self.horizontalLayout = QtWidgets.QHBoxLayout(self.widget1)
        self.horizontalLayout.setContentsMargins(0, 0, 0, 0)
        self.horizontalLayout.setObjectName("horizontalLayout")
        self.label = QtWidgets.QLabel(parent=self.widget1)
        self.label.setObjectName("label")
        self.horizontalLayout.addWidget(self.label)
        self.label_3 = QtWidgets.QLabel(parent=self.widget1)
        self.label_3.setObjectName("label_3")
        self.horizontalLayout.addWidget(self.label_3)
        self.label_2 = QtWidgets.QLabel(parent=self.widget1)
        self.label_2.setText("")
        self.label_2.setObjectName("label_2")
        self.horizontalLayout.addWidget(self.label_2)

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

        self.priceSandwich = 170
        self.pricePotato = 120
        self.priceSauce = 30
        self.priceCola = 80

        self.checkBox_3.setEnabled(False)

        self.checkBox.stateChanged.connect(self.update_order)
        self.checkBox_2.stateChanged.connect(self.update_order)
        self.checkBox_3.stateChanged.connect(self.update_order)
        self.checkBox_4.stateChanged.connect(self.update_order)
        self.pushButton.clicked.connect(self.show_result)

        self.update_order()

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.pushButton.setText(_translate("Form", "ОК"))
        self.checkBox.setText(_translate("Form", "Cэндвич - 170"))
        self.checkBox_2.setText(_translate("Form", "Картошка - 120"))
        self.checkBox_3.setText(_translate("Form", "Соус - 30"))
        self.checkBox_4.setText(_translate("Form", "Coca-Cola - 80"))
        self.label.setText(_translate("Form", "Стоимотсь заказа:"))
        self.label_3.setText(_translate("Form", "TextLabel"))

    def update_order(self):
        if not self.checkBox_2.isChecked():
            self.checkBox_3.setChecked(False)
            self.checkBox_3.setEnabled(False)
        else:
            self.checkBox_3.setEnabled(True)

        total = 0
        if self.checkBox.isChecked():
            total += self.priceSandwich
        if self.checkBox_2.isChecked():
            total += self.pricePotato
        if self.checkBox_3.isChecked():
            total += self.priceSauce
        if self.checkBox_4.isChecked():
            total += self.priceCola

        all_selected = (
                self.checkBox.isChecked() and
                self.checkBox_2.isChecked() and
                self.checkBox_3.isChecked() and
                self.checkBox_4.isChecked()
        )

        if all_selected:
            total -= total * 0.10
            self.label_2.setText("Применена скидка 10%")
        else:
            self.label_2.setText("")

        self.label_3.setText(f"{total:.2f} руб.")

    def show_result(self):
        QtWidgets.QMessageBox.information(
            self.pushButton, "Заказ",f"К оплате: {self.label_3.text()}"
        )

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec())