# -*- coding: utf-8 -*-
# Dioptas - GUI program for fast processing of 2D X-ray diffraction data
# Principal author: Clemens Prescher (clemens.prescher@gmail.com)
# Copyright (C) 2014-2019 GSECARS, University of Chicago, USA
# Copyright (C) 2015-2018 Institute for Geology and Mineralogy, University of Cologne, Germany
# Copyright (C) 2019-2020 DESY, Hamburg, Germany
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
import gc

from xypattern.util.signal import Signal, WeakRefList


def test_weakreflist_with_objects():
    weak_ref_list = WeakRefList()

    class A(str):
        pass

    a = A()
    weak_ref_list.append(a)
    assert len(weak_ref_list) == 1
    assert weak_ref_list[0]() == a

    del a
    gc.collect()
    assert len(weak_ref_list) == 0


def test_weakreflist_with_bound_methods():
    weak_ref_list = WeakRefList()

    class A:
        def method(self):
            return "lala"

    a = A()
    weak_ref_list.append(a.method)

    assert len(weak_ref_list) == 1
    assert weak_ref_list[0]()() == "lala"

    del a
    gc.collect()
    assert len(weak_ref_list) == 0


def test_weakreflist_with_insertion():
    weak_ref_list = WeakRefList()

    class A:
        def method(self):
            return "lala"

    a = A()
    weak_ref_list.insert(0, a.method)

    assert len(weak_ref_list) == 1
    assert weak_ref_list[0]()() == "lala"

    del a
    gc.collect()
    assert len(weak_ref_list) == 0


def test_signal_with_sole_functions():
    signal = Signal()
    memory = []

    def f():
        memory.append(1)

    signal.connect(f)
    signal.emit()
    assert memory == [1]

    signal.disconnect(f)
    signal.emit()
    assert memory == [1]


def test_signal_with_bound_methods():
    signal = Signal()
    memory = []

    class A:
        def method(self):
            memory.append(1)

    a = A()
    signal.connect(a.method)
    signal.emit()
    assert memory == [1]

    signal.disconnect(a.method)
    signal.emit()
    assert memory == [1]


def test_signal_with_signal():
    signal = Signal()
    memory = []

    signal2 = Signal()

    def f():
        memory.append(1)

    signal.connect(f)
    signal2.connect(signal)
    signal2.emit()

    assert memory == [1]


def test_signal_with_priority():
    signal = Signal()
    memory = []

    def f():
        memory.append(1)

    def g():
        memory.append(2)

    signal.connect(f)
    signal.connect(g, priority=True)
    signal.emit()

    assert memory == [2, 1]