if __name__ == '__main__':
    import sys
    import os
    pkg_dir = os.path.split(os.path.abspath(__file__))[0]
    parent_dir, pkg_name = os.path.split(pkg_dir)
    is_pygame_pkg = (pkg_name == 'tests' and
                     os.path.split(parent_dir)[1] == 'pygame')
    if not is_pygame_pkg:
        sys.path.insert(0, parent_dir)
else:
    is_pygame_pkg = __name__.startswith('pygame.tests.')

import unittest
import pygame

import sys

class SurfaceLockTest (unittest.TestCase):

    def test_lock (self):
        sf = pygame.Surface ((5, 5))

        sf.lock ()
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (sf,))

        sf.lock ()
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (sf, sf))

        sf.unlock ()
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (sf,))

        sf.unlock ()
        self.assertEquals (sf.get_locked (), False)
        self.assertEquals (sf.get_locks (), ())

    def test_subsurface_lock (self):
        sf = pygame.Surface ((5, 5))
        subsf = sf.subsurface ((1, 1, 2, 2))
        sf2 = pygame.Surface ((5, 5))

        # Simple blits, nothing should happen here.
        sf2.blit (subsf, (0, 0))
        sf2.blit (sf, (0, 0))

        # Test blitting on self:
        self.assertRaises (pygame.error, sf.blit, subsf, (0, 0))
        #self.assertRaises (pygame.error, subsf.blit, sf, (0, 0))
        # ^ Fails although it should not in my opinion. If I cannot
        # blit the subsurface to the surface, it should not be allowed
        # the other way around as well.

        # Test additional locks.
        sf.lock ()
        sf2.blit (subsf, (0, 0))
        self.assertRaises (pygame.error, sf2.blit, sf, (0, 0))

        subsf.lock ()
        self.assertRaises (pygame.error, sf2.blit, subsf, (0, 0))
        self.assertRaises (pygame.error, sf2.blit, sf, (0, 0))

        # sf and subsf are now explicitly locked. Unlock sf, so we can
        # (assume) to blit it.
        # It will fail though as the subsurface still has a lock around,
        # which is okay and correct behaviour.
        sf.unlock ()
        self.assertRaises (pygame.error, sf2.blit, subsf, (0, 0))
        self.assertRaises (pygame.error, sf2.blit, sf, (0, 0))

        # Run a second unlock on the surface. This should ideally have
        # no effect as the subsurface is the locking reason!
        sf.unlock ()
        self.assertRaises (pygame.error, sf2.blit, sf, (0, 0))
        self.assertRaises (pygame.error, sf2.blit, subsf, (0, 0))
        subsf.unlock ()
        
        sf.lock ()
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (sf,))
        self.assertEquals (subsf.get_locked (), False)
        self.assertEquals (subsf.get_locks (), ())

        subsf.lock ()
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (sf, subsf))
        self.assertEquals (subsf.get_locked (), True)
        self.assertEquals (subsf.get_locks (), (subsf,))

        sf.unlock ()
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (subsf,))
        self.assertEquals (subsf.get_locked (), True)
        self.assertEquals (subsf.get_locks (), (subsf,))

        subsf.unlock ()
        self.assertEquals (sf.get_locked (), False)
        self.assertEquals (sf.get_locks (), ())
        self.assertEquals (subsf.get_locked (), False)
        self.assertEquals (subsf.get_locks (), ())

        subsf.lock ()
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (subsf,))
        self.assertEquals (subsf.get_locked (), True)
        self.assertEquals (subsf.get_locks (), (subsf,))

        subsf.lock ()
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (subsf, subsf))
        self.assertEquals (subsf.get_locked (), True)
        self.assertEquals (subsf.get_locks (), (subsf, subsf))

    def test_pxarray_ref (self):
        sf = pygame.Surface ((5, 5))
        ar = pygame.PixelArray (sf)
        ar2 = pygame.PixelArray (sf)

        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (ar, ar2))

        del ar
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (ar2,))

        ar = ar2[:]
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (ar2,))

        del ar
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (len (sf.get_locks ()), 1)

    def test_buffer (self):
        sf = pygame.Surface ((5, 5))
        buf = sf.get_buffer ()

        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (buf,))

        sf.unlock ()
        self.assertEquals (sf.get_locked (), True)
        self.assertEquals (sf.get_locks (), (buf,))

        del buf
        self.assertEquals (sf.get_locked (), False)
        self.assertEquals (sf.get_locks (), ())


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