# Copyright 2017 Christoph Reiter
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see <http://www.gnu.org/licenses/>.

from __future__ import absolute_import

import os
import signal
import unittest
import threading
from contextlib import contextmanager

try:
    from gi.repository import Gtk
    Gtk_version = Gtk._version
except ImportError:
    Gtk = None
    Gtk_version = None
from gi.repository import Gio, GLib
from gi._ossighelper import wakeup_on_signal, register_sigint_fallback


class TestOverridesWakeupOnAlarm(unittest.TestCase):

    @contextmanager
    def _run_with_timeout(self, timeout, abort_func):
        failed = []

        def fail():
            abort_func()
            failed.append(1)
            return True

        fail_id = GLib.timeout_add(timeout, fail)
        try:
            yield
        finally:
            GLib.source_remove(fail_id)
        self.assertFalse(failed)

    def test_basic(self):
        self.assertEqual(signal.set_wakeup_fd(-1), -1)
        with wakeup_on_signal():
            pass
        self.assertEqual(signal.set_wakeup_fd(-1), -1)

    def test_in_thread(self):
        failed = []

        def target():
            try:
                with wakeup_on_signal():
                    pass
            except:
                failed.append(1)

        t = threading.Thread(target=target)
        t.start()
        t.join(5)
        self.assertFalse(failed)

    @unittest.skipIf(os.name == "nt", "not on Windows")
    def test_glib_mainloop(self):
        loop = GLib.MainLoop()
        signal.signal(signal.SIGALRM, lambda *args: loop.quit())
        GLib.idle_add(signal.setitimer, signal.ITIMER_REAL, 0.001)

        with self._run_with_timeout(2000, loop.quit):
            loop.run()

    @unittest.skipIf(os.name == "nt", "not on Windows")
    def test_gio_application(self):
        app = Gio.Application()
        signal.signal(signal.SIGALRM, lambda *args: app.quit())
        GLib.idle_add(signal.setitimer, signal.ITIMER_REAL, 0.001)

        with self._run_with_timeout(2000, app.quit):
            app.hold()
            app.connect("activate", lambda *args: None)
            app.run()

    @unittest.skipIf(Gtk is None or os.name == "nt", "not on Windows")
    @unittest.skipIf(Gtk is None or Gtk_version == "4.0", "not in gtk4")
    def test_gtk_main(self):
        signal.signal(signal.SIGALRM, lambda *args: Gtk.main_quit())
        GLib.idle_add(signal.setitimer, signal.ITIMER_REAL, 0.001)

        with self._run_with_timeout(2000, Gtk.main_quit):
            Gtk.main()

    @unittest.skipIf(Gtk is None or os.name == "nt", "not on Windows")
    @unittest.skipIf(Gtk is None or Gtk_version == "4.0", "not in gtk4")
    def test_gtk_dialog_run(self):
        w = Gtk.Window()
        d = Gtk.Dialog(transient_for=w)
        signal.signal(signal.SIGALRM, lambda *args: d.destroy())
        GLib.idle_add(signal.setitimer, signal.ITIMER_REAL, 0.001)

        with self._run_with_timeout(2000, d.destroy):
            d.run()


class TestSigintFallback(unittest.TestCase):

    def setUp(self):
        self.assertEqual(
            signal.getsignal(signal.SIGINT), signal.default_int_handler)

    def tearDown(self):
        self.assertEqual(
            signal.getsignal(signal.SIGINT), signal.default_int_handler)

    def test_replace_handler_and_restore_nested(self):
        with register_sigint_fallback(lambda: None):
            new_handler = signal.getsignal(signal.SIGINT)
            self.assertNotEqual(new_handler, signal.default_int_handler)
            with register_sigint_fallback(lambda: None):
                self.assertTrue(signal.getsignal(signal.SIGINT) is new_handler)
        self.assertEqual(
            signal.getsignal(signal.SIGINT), signal.default_int_handler)

    def test_no_replace_if_not_default(self):
        new_handler = lambda *args: None
        signal.signal(signal.SIGINT, new_handler)
        try:
            with register_sigint_fallback(lambda: None):
                self.assertTrue(signal.getsignal(signal.SIGINT) is new_handler)
                with register_sigint_fallback(lambda: None):
                    self.assertTrue(
                        signal.getsignal(signal.SIGINT) is new_handler)
            self.assertTrue(signal.getsignal(signal.SIGINT) is new_handler)
        finally:
            signal.signal(signal.SIGINT, signal.default_int_handler)

    def test_noop_in_threads(self):
        failed = []

        def target():
            try:
                with register_sigint_fallback(lambda: None):
                    with register_sigint_fallback(lambda: None):
                        self.assertTrue(
                            signal.getsignal(signal.SIGINT) is
                            signal.default_int_handler)
            except:
                failed.append(1)

        t = threading.Thread(target=target)
        t.start()
        t.join(5)
        self.assertFalse(failed)

    @unittest.skipIf(os.name == "nt", "not on Windows")
    def test_no_replace_if_set_by_glib(self):
        id_ = GLib.unix_signal_add(
            GLib.PRIORITY_DEFAULT, signal.SIGINT, lambda *args: None)
        try:
            # signal.getsignal() doesn't pick up that unix_signal_add()
            # has changed the handler, but we should anyway.
            self.assertEqual(
                signal.getsignal(signal.SIGINT), signal.default_int_handler)
            with register_sigint_fallback(lambda: None):
                self.assertEqual(
                    signal.getsignal(signal.SIGINT),
                    signal.default_int_handler)
            self.assertEqual(
                signal.getsignal(signal.SIGINT), signal.default_int_handler)
        finally:
            GLib.source_remove(id_)
            signal.signal(signal.SIGINT, signal.SIG_DFL)
            signal.signal(signal.SIGINT, signal.default_int_handler)
