def test_check_enum():
    from vispy.gloo import gl
    
    # Test enums
    assert util.check_enum(gl.GL_RGB) == 'rgb' 
    assert util.check_enum(gl.GL_TRIANGLE_STRIP) == 'triangle_strip' 
    
    # Test strings
    assert util.check_enum('RGB') == 'rgb' 
    assert util.check_enum('Triangle_STRIp') == 'triangle_strip' 
    
    # Test wrong input
    assert_raises(ValueError, util.check_enum, int(gl.GL_RGB))
    assert_raises(ValueError, util.check_enum, int(gl.GL_TRIANGLE_STRIP))
    assert_raises(ValueError, util.check_enum, [])
    
    # Test with test
    util.check_enum('RGB', 'test', ('rgb', 'alpha')) == 'rgb' 
    util.check_enum(gl.GL_ALPHA, 'test', ('rgb', 'alpha')) == 'alpha' 
    #
    assert_raises(ValueError, util.check_enum, 'RGB', 'test', ('a', 'b'))
    assert_raises(ValueError, util.check_enum, gl.GL_ALPHA, 'test', ('a', 'b'))
    
    # Test PyOpenGL enums
    try:
        from OpenGL import GL
    except ImportError:
        return  # we cannot test PyOpenGL
    #
    assert util.check_enum(GL.GL_RGB) == 'rgb' 
    assert util.check_enum(GL.GL_TRIANGLE_STRIP) == 'triangle_strip' 

def test_config():
    """Test vispy config methods and file downloading"""
    assert_raises(TypeError, config.update, data_path=dict())
    assert_raises(KeyError, config.update, foo="bar")  # bad key
    data_dir = op.join(temp_dir, "data")
    assert_raises(IOError, set_data_dir, data_dir)  # didn't say to create
    orig_val = os.environ.get("_VISPY_CONFIG_TESTING", None)
    os.environ["_VISPY_CONFIG_TESTING"] = "true"
    try:
        assert_raises(IOError, set_data_dir, data_dir)  # doesn't exist yet
        set_data_dir(data_dir, create=True, save=True)
        assert_equal(config["data_path"], data_dir)
        config["data_path"] = data_dir
        print(config)  # __repr__
        load_data_file("CONTRIBUTING.txt")
        fid = open(op.join(data_dir, "test-faked.txt"), "w")
        fid.close()
        load_data_file("test-faked.txt")  # this one shouldn't download
        assert_raises(RuntimeError, load_data_file, "foo-nonexist.txt")
        save_config()
    finally:
        if orig_val is not None:
            os.environ["_VISPY_CONFIG_TESTING"] = orig_val
        else:
            del os.environ["_VISPY_CONFIG_TESTING"]

def test_context_config():
    """ Test GLContext handling of config dict
    """
    default_config = get_default_config()
    
    # Pass default config unchanged
    c = GLContext(default_config)
    assert_equal(c.config, default_config)
    # Must be deep copy
    c.config['double_buffer'] = False
    assert_not_equal(c.config, default_config)
    
    # Passing nothing should yield default config
    c = GLContext()
    assert_equal(c.config, default_config)
    # Must be deep copy
    c.config['double_buffer'] = False
    assert_not_equal(c.config, default_config)
    
    # This should work
    c = GLContext({'red_size': 4, 'double_buffer': False})
    assert_equal(c.config.keys(), default_config.keys())
    
    # Passing crap should raise
    assert_raises(KeyError, GLContext, {'foo': 3})
    assert_raises(TypeError, GLContext, {'double_buffer': 'not_bool'})

def test_FunctionCall():
    fun = Function(transformScale)
    fun['scale'] = '1.0'
    fun2 = Function(transformZOffset)
    
    # No args
    assert_raises(TypeError, fun)  # need 1 arg
    assert_raises(TypeError, fun, 1, 2)  # need 1 arg
    call = fun('x')
    # Test repr
    exp = call.expression({fun: 'y'})
    assert_equal(exp, 'y(x)')
    # Test sig
    assert len(call._args) == 1
    # Test dependencies
    assert_in(fun, call.dependencies())
    assert_in(call._args[0], call.dependencies())
    
    # More args
    call = fun(fun2('foo'))
    # Test repr
    exp = call.expression({fun: 'y', fun2: 'z'})
    assert_in('y(z(', exp)
    # Test sig
    assert len(call._args) == 1
    call2 = call._args[0]
    assert len(call2._args) == 1
    # Test dependencies
    assert_in(fun, call.dependencies())
    assert_in(call._args[0], call.dependencies())
    assert_in(fun2, call.dependencies())
    assert_in(call2._args[0], call.dependencies())

def test_use():
    
    # Set default app to None, so we can test the use function
    vispy.app.use_app()
    default_app = vispy.app._default_app.default_app
    vispy.app._default_app.default_app = None
    
    app_name = default_app.backend_name.split(' ')[0]
    
    try:
        # With no arguments, should do nothing
        assert_raises(TypeError, vispy.use)
        assert_equal(vispy.app._default_app.default_app, None)
        
        # With only gl args, should do nothing to app
        vispy.use(gl='gl2')
        assert_equal(vispy.app._default_app.default_app, None)
        
        # Specify app (one we know works)
        vispy.use(app_name)
        assert_not_equal(vispy.app._default_app.default_app, None)
        
        # Again, but now wrong app
        wrong_name = 'glfw' if app_name.lower() != 'glfw' else 'pyqt4'
        assert_raises(RuntimeError, vispy.use, wrong_name)
        
        # And both
        vispy.use(app_name, 'gl2')
    
    finally:
        # Restore
        vispy.app._default_app.default_app = default_app

def test_Variable():
    
    # Test init fail
    assert_raises(TypeError, Variable)  # no args
    assert_raises(TypeError, Variable, 3)  # wrong type
    assert_raises(TypeError, Variable, "name", "str")  # wrong type
    assert_raises(ValueError, Variable, 'bla bla')  # need correct vtype
    assert_raises(ValueError, Variable, 'uniform b l a')  # too many
    
    # Test init success
    var = Variable('uniform float bla')  # Finally
    assert_equal(var.name, 'bla')
    assert_equal(var.dtype, 'float')
    assert_equal(var.vtype, 'uniform')
    assert var.value is None
    
    # test assign new value
    var.value = 10.
    assert_equal(var.dtype, 'float')  # type is locked; won't change
    
    # test name-only init
    var = Variable('bla')  # Finally
    assert_equal(var.name, 'bla')
    assert_equal(var.dtype, None)
    assert_equal(var.vtype, None)
    assert var.value is None
    
    # test assign new value
    var.value = 10
    assert_equal(var.dtype, 'int')
    assert_equal(var.vtype, 'uniform')
    assert_equal(var.value, 10)
    
    # test init with value
    var = Variable('bla', (1, 2, 3))  # Also valid
    assert_equal(var.name, 'bla')
    assert_equal(var.dtype, 'vec3')
    assert_equal(var.vtype, 'uniform')
    assert_equal(var.value, (1, 2, 3))
    
    # Test value
    #var = Variable('uniform float bla', data)  # Also valid
    #assert_equal(var.value, data)
    #var.value = 3
    #assert_equal(var.value, 3)
    
    # Test repr
    var = Variable('uniform float bla')
    assert_in('uniform float bla', var.compile())
    
    # Test injection, definition, dependencies
    assert_equal(var.expression({var: 'xxx'}), 'xxx')
    assert_equal(var.definition({var: 'xxx'}), 'uniform float xxx;')
    assert_in(var, var.dependencies())
    
    # Renaming
    var = Variable('uniform float bla')
    assert_equal(var.name, 'bla')
    var.name = 'foo'
    assert_equal(var.name, 'foo')

def _test_texture_internalformats(Texture, baseshape):
    # Test format for concrete Texture class and baseshape + (numchannels,)
    # Test internalformats valid with desktop OpenGL

    formats = [
        (1, 'red', ['red', 'r8', 'r16', 'r16f', 'r32f']),
        (2, 'rg', ['rg', 'rg8', 'rg16', 'rg16f', 'rg32f']),
        (3, 'rgb', ['rgb', 'rgb8', 'rgb16', 'rgb16f', 'rgb32f']),
        (4, 'rgba', ['rgba', 'rgba8', 'rgba16', 'rgba16f', 'rgba32f'])
    ]
        
    for channels in range(1, 5):
        for fmt, ifmts in [(f, iL) for n, f, iL in formats if n == channels]:
            shape = baseshape + (channels,)
            data = np.zeros(shape, dtype=np.uint8)
            for ifmt in ifmts:
                T = Texture(shape=shape, format=fmt, internalformat=ifmt)
                assert 'Texture' in repr(T)
                assert T._shape == shape
                T = Texture(data=data, format=fmt, internalformat=ifmt)
                assert 'Texture' in repr(T)
                assert T._shape == shape

    for channels in range(1, 5):
        for fmt, ifmts in [(f, iL) for n, f, iL in formats if n != channels]:
            shape = baseshape + (channels,)
            data = np.zeros(shape, dtype=np.uint8)
            for ifmt in ifmts:
                assert_raises(ValueError, Texture, shape=shape, format=fmt,
                              internalformat=ifmt)
                assert_raises(ValueError, Texture, data=data, format=fmt,
                              internalformat=ifmt)

def test_linear_region_vertical_horizontal():
    """Test vertical and horizontal LinearRegionVisual with a single color"""

    # Definition of the region
    pos = np.array([5, 15, 24, 36, 40, 42], dtype=np.float32)
    # Expected internal pos buffer for vertical region
    expected_pos_v = np.array([[5.0, -1.],
                               [5.0, 1.],
                               [15.0, -1.],
                               [15.0, 1.],
                               [24.0, -1.],
                               [24.0, 1.],
                               [36.0, -1.],
                               [36.0, 1.],
                               [40.0, -1.],
                               [40.0, 1.],
                               [42.0, -1.],
                               [42.0, 1.]], dtype=np.float32)
    # Expected internal pos buffer for horizontal region
    expected_pos_h = np.array([expected_pos_v[:, 1] * -1,
                               expected_pos_v[:, 0]], dtype=np.float32).T

    # Test both horizontal and vertical region
    for is_vertical, reference_image in [(True, 'linear_region1.png'),
                                         (False, 'linear_region1_h.png')]:

        expected_pos = expected_pos_v if is_vertical else expected_pos_h

        with TestingCanvas() as c:
            # Check set_data is working correctly within visual constructor
            region = visuals.LinearRegion(pos=pos,
                                          color=[0.0, 1.0, 0.0, 0.5],
                                          vertical=is_vertical,
                                          parent=c.scene)
            assert np.all(region._pos == expected_pos)
            assert np.all(region.pos == pos)
            assert region.is_vertical == is_vertical

            # Check set_data is working as expected when passing a list as
            # pos argument
            region.set_data(pos=list(pos))
            assert np.all(region._pos == expected_pos)
            assert np.all(region.pos == pos)

            # Check set_data is working as expected when passing a tuple as
            # pos argument
            region.set_data(pos=tuple(pos))
            assert np.all(region._pos == expected_pos)
            assert np.all(region.pos == pos)

            # Test with different dtypes that must be converted to float32
            for t in [np.int64, np.float64, np.int32]:
                region.set_data(pos=pos.astype(t))
                assert np.all(region._pos == expected_pos)
                assert np.all(region.pos == pos)

            assert_image_approved(c.render(), 'visuals/%s' % reference_image)

            # Check ValueError is raised when pos is not 1D
            assert_raises(ValueError, region.set_data, pos=[[1, 2], [3, 4]])

def test_context_sharing():
    """Test context sharing"""
    with Canvas() as c1:
        vert = "attribute vec4 pos;\nvoid main (void) {gl_Position = pos;}"
        frag = "void main (void) {gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);}"
        program = Program(vert, frag)
        program['pos'] = [(1, 2, 3, 1), (4, 5, 6, 1)]
        program.draw('points')

        def check():
            # Do something to program and see if it worked
            program['pos'] = [(1, 2, 3, 1), (4, 5, 6, 1)]  # Do command
            program.draw('points')
            check_error()

        # Check while c1 is active
        check()

        # Check while c2 is active (with different context)
        with Canvas() as c2:
            # pyglet always shares
            if 'pyglet' not in c2.app.backend_name.lower():
                assert_raises(Exception, check)

        # Check while c2 is active (with *same* context)
        with Canvas(shared=c1.context) as c2:
            assert c1.context.shared is c2.context.shared  # same object
            check()

def test_color_array():
    """Basic tests for ColorArray class"""
    x = ColorArray(['r', 'g', 'b'])
    assert_array_equal(x.rgb, np.eye(3))
    # Test ColorArray.__getitem__.
    assert isinstance(x[0], ColorArray)
    assert isinstance(x[:], ColorArray)
    assert_array_equal(x.rgba[:], x[:].rgba)
    assert_array_equal(x.rgba[0], x[0].rgba.squeeze())
    assert_array_equal(x.rgba[1:3], x[1:3].rgba)
    assert_raises(ValueError, x.__getitem__, (0, 1))
    # Test ColorArray.__setitem__.
    x[0] = 0
    assert_array_equal(x.rgba[0, :], np.zeros(4))
    assert_array_equal(x.rgba, x[:].rgba)
    x[1] = 1
    assert_array_equal(x[1].rgba, np.ones((1, 4)))
    x[:] = .5
    assert_array_equal(x.rgba, .5 * np.ones((3, 4)))
    assert_raises(ValueError, x.__setitem__, (0, 1), 0)

    # test hsv color space colors
    x = ColorArray(color_space="hsv", color=[(0, 0, 1),
                   (0, 0, 0.5), (0, 0, 0)])
    assert_array_equal(x.rgba[0], [1, 1, 1, 1])
    assert_array_equal(x.rgba[1], [0.5, 0.5, 0.5, 1])
    assert_array_equal(x.rgba[2], [0, 0, 0, 1])

    x = ColorArray(color_space="hsv")
    assert_array_equal(x.rgba[0], [0, 0, 0, 1])

def test_context_taking():
    """ Test GLContext ownership and taking
    """
    def get_canvas(c):
        return c.shared.ref
    
    cb = DummyCanvasBackend()
    c = GLContext()
    
    # Context is not taken and cannot get backend_canvas
    assert c.shared.name is None
    assert_raises(RuntimeError, get_canvas, c)
    assert_in('None backend', repr(c.shared))
    
    # Take it
    c.shared.add_ref('test-foo', cb)
    assert c.shared.ref is cb
    assert_in('test-foo backend', repr(c.shared))
    
    # Now we can take it again
    c.shared.add_ref('test-foo', cb)
    assert len(c.shared._refs) == 2
    #assert_raises(RuntimeError, c.take, 'test', cb)
    
    # Canvas backend can delete (we use a weak ref)
    cb = DummyCanvasBackend()  # overwrite old object
    gc.collect()
    
    # No more refs
    assert_raises(RuntimeError, get_canvas, c)

def test_figure_creation():
    """Test creating a figure"""
    with vp.Fig(show=False) as fig:
        fig[0, 0:2]
        fig[1:3, 0:2]
        ax_right = fig[1:3, 2]
        assert fig[1:3, 2] is ax_right
        # collision
        assert_raises(ValueError, fig.__getitem__, (slice(1, 3), 1))

def test_wrappers():
    """Test gloo wrappers"""
    with Canvas():
        gl.use_gl('gl2 debug')
        gloo.clear('#112233')  # make it so that there's something non-zero
        # check presets
        assert_raises(ValueError, gloo.set_state, preset='foo')
        for state in gloo.get_state_presets().keys():
            gloo.set_state(state)
        assert_raises(ValueError, gloo.set_blend_color, (0., 0.))  # bad color
        assert_raises(TypeError, gloo.set_hint, 1, 2)  # need strs
        # this doesn't exist in ES 2.0 namespace
        assert_cmd_raises(ValueError, gloo.set_hint, 'fog_hint', 'nicest')
        # test bad enum
        assert_raises(RuntimeError, gloo.set_line_width, -1)

        # check read_pixels
        x = gloo.read_pixels()
        assert_true(isinstance(x, np.ndarray))
        assert_true(isinstance(gloo.read_pixels((0, 0, 1, 1)), np.ndarray))
        assert_raises(ValueError, gloo.read_pixels, (0, 0, 1))  # bad port
        y = gloo.read_pixels(alpha=False, out_type=np.ubyte)
        assert_equal(y.shape, x.shape[:2] + (3,))
        assert_array_equal(x[..., :3], y)
        y = gloo.read_pixels(out_type='float')
        assert_allclose(x/255., y)

        # now let's (indirectly) check our set_* functions
        viewport = (0, 0, 1, 1)
        blend_color = (0., 0., 0.)
        _funs = dict(viewport=viewport,  # checked
                     hint=('generate_mipmap_hint', 'nicest'),
                     depth_range=(1., 2.),
                     front_face='cw',  # checked
                     cull_face='front',
                     line_width=1.,
                     polygon_offset=(1., 1.),
                     blend_func=('zero', 'one'),
                     blend_color=blend_color,
                     blend_equation='func_add',
                     scissor=(0, 0, 1, 1),
                     stencil_func=('never', 1, 2, 'back'),
                     stencil_mask=4,
                     stencil_op=('zero', 'zero', 'zero', 'back'),
                     depth_func='greater',
                     depth_mask=True,
                     color_mask=(True, True, True, True),
                     sample_coverage=(0.5, True))
        gloo.set_state(**_funs)
        gloo.clear((1., 1., 1., 1.), 0.5, 1)
        gloo.flush()
        gloo.finish()
        # check some results
        assert_array_equal(gl.glGetParameter(gl.GL_VIEWPORT), viewport)
        assert_equal(gl.glGetParameter(gl.GL_FRONT_FACE), gl.GL_CW)
        assert_equal(gl.glGetParameter(gl.GL_BLEND_COLOR), blend_color + (1,))

def test_use_uniforms():
    """Test using uniform arrays"""
    VERT_SHADER = """
    attribute vec2 a_pos;
    varying vec2 v_pos;

    void main (void)
    {
        v_pos = a_pos;
        gl_Position = vec4(a_pos, 0., 1.);
    }
    """

    FRAG_SHADER = """
    varying vec2 v_pos;
    uniform vec3 u_color[2];

    void main()
    {
        gl_FragColor = vec4((u_color[0] + u_color[1]) / 2., 1.);
    }
    """
    shape = (500, 500)
    with Canvas(size=shape) as c:
        c.set_current()
        c.context.glir.set_verbose(True)
        assert_equal(c.size, shape[::-1])
        shape = (3, 3)
        set_viewport((0, 0) + shape)
        program = Program(VERT_SHADER, FRAG_SHADER)
        program['a_pos'] = [[-1., -1.], [1., -1.], [-1., 1.], [1., 1.]]
        program['u_color'] = np.ones((2, 3))
        c.context.clear('k')
        c.set_current()
        program.draw('triangle_strip')
        out = _screenshot()
        assert_allclose(out[:, :, 0] / 255., np.ones(shape), atol=1. / 255.)

        # now set one element
        program['u_color[1]'] = np.zeros(3, np.float32)
        c.context.clear('k')
        program.draw('triangle_strip')
        out = _screenshot()
        assert_allclose(out[:, :, 0] / 255., 127.5 / 255. * np.ones(shape),
                        atol=1. / 255.)

        # and the other
        assert_raises(ValueError, program.__setitem__, 'u_color',
                      np.zeros(3, np.float32))
        program['u_color'] = np.zeros((2, 3), np.float32)
        program['u_color[0]'] = np.ones(3, np.float32)
        c.context.clear((0.33,) * 3)
        program.draw('triangle_strip')
        out = _screenshot()
        assert_allclose(out[:, :, 0] / 255., 127.5 / 255. * np.ones(shape),
                        atol=1. / 255.)

def test_key():
    """Test basic key functionality"""
    def bad():
        return (ENTER == dict())
    assert_raises(ValueError, bad)
    assert_true(not (ENTER == None))  # noqa
    assert_equal('Return', ENTER)
    print(ENTER.name)
    print(ENTER)  # __repr__
    assert_equal(Key('1'), 49)  # ASCII code

def test_use_texture3D():
    """Test using a 3D texture"""
    vals = [0, 200, 100, 0, 255, 0, 100]
    d, h, w = len(vals), 3, 5
    data = np.zeros((d, h, w), np.float32)

    VERT_SHADER = """
    attribute vec2 a_pos;
    varying vec2 v_pos;

    void main (void)
    {
        v_pos = a_pos;
        gl_Position = vec4(a_pos, 0., 1.);
    }
    """

    FRAG_SHADER = """
    uniform sampler3D u_texture;
    varying vec2 v_pos;
    uniform float i;
    void main()
    {
        gl_FragColor = texture3D(u_texture,
                                 vec3((v_pos.y+1.)/2., (v_pos.x+1.)/2., i));
        gl_FragColor.a = 1.;
    }
    """
    # populate the depth "slices" with different gray colors in the bottom left
    for ii, val in enumerate(vals):
        data[ii, :2, :3] = val / 255.
    with Canvas(size=(100, 100)) as c:
        if not has_pyopengl():
            t = Texture3D(data)
            assert_raises(ImportError, t.glir.flush, c.context.shared.parser)
            return
        program = Program(VERT_SHADER, FRAG_SHADER)
        program['a_pos'] = [[-1., -1.], [1., -1.], [-1., 1.], [1., 1.]]
        tex = Texture3D(data, interpolation='nearest')
        assert_equal(tex.width, w)
        assert_equal(tex.height, h)
        assert_equal(tex.depth, d)
        program['u_texture'] = tex
        for ii, val in enumerate(vals):
            set_viewport(0, 0, w, h)
            clear(color='black')
            iii = (ii + 0.5) / float(d)
            print(ii, iii)
            program['i'] = iii
            program.draw('triangle_strip')
            out = _screenshot()[:, :, 0].astype(int)[::-1]
            expected = np.zeros_like(out)
            expected[:2, :3] = val
            assert_allclose(out, expected, atol=1./255.)

def test_sys_info():
    """Test printing of system information"""
    fname = op.join(temp_dir, "info.txt")
    sys_info(fname)
    assert_raises(IOError, sys_info, fname)  # no overwrite
    with open(fname, "r") as fid:
        out = "".join(fid.readlines())
    keys = ["GL version", "Python", "Backend", "pyglet", "Platform:"]
    for key in keys:
        assert_in(key, out)
    print(out)
    assert_true("Info-gathering error" not in out)

def test_get_layout():
    from vispy.visuals.graphs.layouts.random import random

    # Simple retrieval
    assert_equal(random, get_layout('random'))

    # Pass arguments
    fruchterman_reingold = get_layout('force_directed', iterations=100)
    assert_equal(fruchterman_reingold.iterations, 100)

    # Check if layout exists
    assert_raises(KeyError, get_layout, 'fdgdfgs_non_existent')

def test_sys_info():
    """Test printing of system information"""
    fname = op.join(temp_dir, 'info.txt')
    sys_info(fname)
    assert_raises(IOError, sys_info, fname)  # no overwrite
    with open(fname, 'r') as fid:
        out = ''.join(fid.readlines())
    keys = ['GL version', 'Python', 'Backend', 'pyglet', 'Platform:']
    for key in keys:
        assert_in(key, out)
    print(out)
    assert_true('Info-gathering error' not in out)

 def test_group_ignore(self):
     """EmitterGroup.block_all"""
     grp = EmitterGroup(em1=Event)
     grp.em1.connect(self.error_event)
     with use_log_level('warning', record=True, print_msg=False) as l:
         grp.em1()
     assert_true(len(l) >= 1)
     grp.ignore_callback_errors = False
     assert_raises(RuntimeError, grp.em1)
     grp.ignore_callback_errors = True
     with use_log_level('warning', record=True, print_msg=False) as l:
         grp.em1()
     assert_true(len(l) >= 1)