# -*- coding: utf-8 -*-
# copyright 2018 gevent contributors. See LICENSE for details.

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import gc


import gevent.testing as greentest
from gevent._ident import IdentRegistry
from gevent._compat import PYPY

class Target(object):
    pass

class TestIdent(greentest.TestCase):

    def setUp(self):
        self.reg = IdentRegistry()

    def tearDown(self):
        self.reg = None

    def test_basic(self):
        target = Target()
        self.assertEqual(0, self.reg.get_ident(target))
        self.assertEqual(1, len(self.reg))

        self.assertEqual(0, self.reg.get_ident(target))
        self.assertEqual(1, len(self.reg))

        target2 = Target()
        self.assertEqual(1, self.reg.get_ident(target2))
        self.assertEqual(2, len(self.reg))

        self.assertEqual(1, self.reg.get_ident(target2))
        self.assertEqual(2, len(self.reg))

        self.assertEqual(0, self.reg.get_ident(target))

        # When an object dies, we can re-use
        # its id. Under PyPy we need to collect garbage first.
        del target
        if PYPY:
            for _ in range(3):
                gc.collect()

        self.assertEqual(1, len(self.reg))

        target3 = Target()
        self.assertEqual(1, self.reg.get_ident(target2))
        self.assertEqual(0, self.reg.get_ident(target3))
        self.assertEqual(2, len(self.reg))

    @greentest.skipOnPyPy("This would need to GC very frequently")
    def test_circle(self):
        keep_count = 3
        keepalive = [None] * keep_count

        for i in range(1000):
            target = Target()
            # Drop an old one.
            keepalive[i % keep_count] = target
            self.assertLessEqual(self.reg.get_ident(target), keep_count)


@greentest.skipOnPurePython("Needs C extension")
class TestCExt(greentest.TestCase):

    def test_c_extension(self):
        self.assertEqual(IdentRegistry.__module__,
                         'gevent._gevent_c_ident')




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