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'''Test cases for QLayout handling of child widgets references'''

import os
import sys
from sys import getrefcount
import unittest

sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
from init_paths import init_test_paths
init_test_paths(False)

from PySide2.QtWidgets import QHBoxLayout, QVBoxLayout, QGridLayout, QWidget
from PySide2.QtWidgets import QStackedLayout, QFormLayout
from PySide2.QtWidgets import QApplication, QPushButton, QLabel

from helper.usesqapplication import UsesQApplication

class SaveReference(UsesQApplication):
    '''Test case to check if QLayout-derived classes increment the refcount
    of widgets passed to addWidget()'''

    # Adding here as nose can't see the qapplication attrib we inherit
    qapplication = True

    def setUp(self):
        #Acquire resources
        super(SaveReference, self).setUp()
        self.widget1 = QPushButton('click me')
        self.widget2 = QLabel('aaa')

    def tearDown(self):
        #Release resources
        del self.widget2
        del self.widget1
        super(SaveReference, self).tearDown()

    def checkLayoutReference(self, layout):
        #Checks the reference cound handling of layout.addWidget
        self.assertEqual(getrefcount(self.widget1), 2)
        layout.addWidget(self.widget1)
        self.assertEqual(getrefcount(self.widget1), 3)

        self.assertEqual(getrefcount(self.widget2), 2)
        layout.addWidget(self.widget2)
        self.assertEqual(getrefcount(self.widget2), 3)

        # Check if doesn't mess around with previous widget refcount
        self.assertEqual(getrefcount(self.widget1), 3)

    def testMoveLayout(self):
        l = QHBoxLayout()
        self.assertEqual(getrefcount(self.widget1), 2)
        l.addWidget(self.widget1)
        self.assertEqual(getrefcount(self.widget1), 3)

        w = QWidget()
        w.setLayout(l)
        self.assertEqual(getrefcount(self.widget1), 3)


    def testHBoxReference(self):
        #QHBoxLayout.addWidget reference count
        w = QWidget()
        self.checkLayoutReference(QHBoxLayout(w))

    def testVBoxReference(self):
        #QVBoxLayout.addWidget reference count
        w = QWidget()
        self.checkLayoutReference(QVBoxLayout(w))

    def testGridReference(self):
        #QGridLayout.addWidget reference count
        w = QWidget()
        self.checkLayoutReference(QGridLayout(w))

    def testFormReference(self):
        #QFormLayout.addWidget reference count
        w = QWidget()
        self.checkLayoutReference(QFormLayout(w))

    def testStackedReference(self):
        #QStackedLayout.addWidget reference count
        w = QWidget()
        self.checkLayoutReference(QStackedLayout(w))

class MultipleAdd(UsesQApplication):
    '''Test case to check if refcount is incremented only once when multiple
    calls to addWidget are made with the same widget'''

    qapplication = True

    def setUp(self):
        #Acquire resources
        super(MultipleAdd, self).setUp()
        self.widget = QPushButton('click me')
        self.win = QWidget()
        self.layout = QHBoxLayout(self.win)

    def tearDown(self):
        #Release resources
        del self.widget
        del self.layout
        del self.win
        super(MultipleAdd, self).tearDown()

    def testRefCount(self):
        #Multiple QLayout.addWidget calls on the same widget
        self.assertEqual(getrefcount(self.widget), 2)
        self.layout.addWidget(self.widget)
        self.assertEqual(getrefcount(self.widget), 3)
        self.layout.addWidget(self.widget)
        self.assertEqual(getrefcount(self.widget), 3)
        self.layout.addWidget(self.widget)
        self.assertEqual(getrefcount(self.widget), 3)

class InternalAdd(UsesQApplication):
    def testInternalRef(self):
        mw = QWidget()
        w = QWidget()
        ow = QWidget()

        topLayout = QGridLayout()

        # unique reference
        self.assertEqual(getrefcount(w), 2)
        self.assertEqual(getrefcount(ow), 2)

        topLayout.addWidget(w, 0, 0)
        topLayout.addWidget(ow, 1, 0)

        # layout keep the referemce
        self.assertEqual(getrefcount(w), 3)
        self.assertEqual(getrefcount(ow), 3)

        mainLayout = QGridLayout()

        mainLayout.addLayout(topLayout, 1, 0, 1, 4)

        # the same reference
        self.assertEqual(getrefcount(w), 3)
        self.assertEqual(getrefcount(ow), 3)

        mw.setLayout(mainLayout)

        # now trasfer the ownership to mw
        self.assertEqual(getrefcount(w), 3)
        self.assertEqual(getrefcount(ow), 3)

        del mw

        # remove the ref and invalidate the widget
        self.assertEqual(getrefcount(w), 2)
        self.assertEqual(getrefcount(ow), 2)


if __name__ == '__main__':
    unittest.main()