import faulthandler
import gc
import os
import unittest

from PyQt5.QtCore import Qt
from PyQt5.QtGui import QDropEvent
from PyQt5.QtTest import QTest
from PyQt5.QtWidgets import QApplication

from tests.utils_testing import write_settings, get_path_for_data_file
from urh.controller.MainController import MainController
from urh.signalprocessing.ProtocolSniffer import ProtocolSniffer

faulthandler.enable()


class QtTestCase(unittest.TestCase):
    SHOW = os.path.exists(os.path.join(os.path.dirname(os.path.realpath(__file__)), "show_gui"))

    @classmethod
    def setUpClass(cls):
        import multiprocessing as mp
        try:
            mp.set_start_method("spawn")
        except RuntimeError:
            pass
        assert mp.get_start_method() == "spawn"

        write_settings()
        cls.app = QApplication([cls.__name__])

    @classmethod
    def tearDownClass(cls):
        cls.app.quit()
        del cls.app

    def setUp(self):
        ProtocolSniffer.BUFFER_SIZE_MB = 0.5
        self.form = MainController()
        self.form.ui.actionAuto_detect_new_signals.setChecked(False)
        if self.SHOW:
            self.form.show()

    def tearDown(self):
        if hasattr(self, "dialog"):
            self.dialog.close()
            del self.dialog

        if hasattr(self, "form"):
            self.form.close_all_files()
            self.form.close()
            del self.form

        gc.collect()

    def add_signal_to_form(self, filename: str):
        self.form.add_signalfile(get_path_for_data_file(filename))

    def get_path_for_filename(self, filename) -> str:
        return get_path_for_data_file(filename)

    def add_signal_to_generator(self, signal_index: int):
        gframe = self.form.generator_tab_controller
        item = gframe.tree_model.rootItem.children[0].children[signal_index]
        index = gframe.tree_model.createIndex(signal_index, 0, item)
        rect = gframe.ui.treeProtocols.visualRect(index)
        QTest.mousePress(gframe.ui.treeProtocols.viewport(), Qt.LeftButton, pos=rect.center())
        self.assertEqual(gframe.ui.treeProtocols.selectedIndexes()[0], index)
        mimedata = gframe.tree_model.mimeData(gframe.ui.treeProtocols.selectedIndexes())
        gframe.table_model.dropMimeData(mimedata, 1, -1, -1, gframe.table_model.createIndex(0, 0))

    def add_all_signals_to_simulator(self):
        assert isinstance(self.form, MainController)
        sim_frame = self.form.simulator_tab_controller
        sim_frame.ui.treeProtocols.selectAll()
        self.assertGreater(len(sim_frame.ui.treeProtocols.selectedIndexes()), 0)
        mimedata = sim_frame.tree_model.mimeData(sim_frame.ui.treeProtocols.selectedIndexes())
        drop_event = QDropEvent(sim_frame.ui.gvSimulator.rect().center(), Qt.CopyAction | Qt.MoveAction,
                                mimedata, Qt.LeftButton, Qt.NoModifier)
        drop_event.acceptProposedAction()
        sim_frame.ui.gvSimulator.dropEvent(drop_event)