from .helper import PillowTestCase

from PIL import GimpGradientFile


class TestImage(PillowTestCase):

    def test_linear_pos_le_middle(self):
        # Arrange
        middle = 0.5
        pos = 0.25

        # Act
        ret = GimpGradientFile.linear(middle, pos)

        # Assert
        self.assertEqual(ret, 0.25)

    def test_linear_pos_le_small_middle(self):
        # Arrange
        middle = 1e-11
        pos = 1e-12

        # Act
        ret = GimpGradientFile.linear(middle, pos)

        # Assert
        self.assertEqual(ret, 0.0)

    def test_linear_pos_gt_middle(self):
        # Arrange
        middle = 0.5
        pos = 0.75

        # Act
        ret = GimpGradientFile.linear(middle, pos)

        # Assert
        self.assertEqual(ret, 0.75)

    def test_linear_pos_gt_small_middle(self):
        # Arrange
        middle = 1 - 1e-11
        pos = 1 - 1e-12

        # Act
        ret = GimpGradientFile.linear(middle, pos)

        # Assert
        self.assertEqual(ret, 1.0)

    def test_curved(self):
        # Arrange
        middle = 0.5
        pos = 0.75

        # Act
        ret = GimpGradientFile.curved(middle, pos)

        # Assert
        self.assertEqual(ret, 0.75)

    def test_sine(self):
        # Arrange
        middle = 0.5
        pos = 0.75

        # Act
        ret = GimpGradientFile.sine(middle, pos)

        # Assert
        self.assertEqual(ret, 0.8535533905932737)

    def test_sphere_increasing(self):
        # Arrange
        middle = 0.5
        pos = 0.75

        # Act
        ret = GimpGradientFile.sphere_increasing(middle, pos)

        # Assert
        self.assertAlmostEqual(ret, 0.9682458365518543)

    def test_sphere_decreasing(self):
        # Arrange
        middle = 0.5
        pos = 0.75

        # Act
        ret = GimpGradientFile.sphere_decreasing(middle, pos)

        # Assert
        self.assertEqual(ret, 0.3385621722338523)

    def test_load_via_imagepalette(self):
        # Arrange
        from PIL import ImagePalette
        test_file = "Tests/images/gimp_gradient.ggr"

        # Act
        palette = ImagePalette.load(test_file)

        # Assert
        # load returns raw palette information
        self.assertEqual(len(palette[0]), 1024)
        self.assertEqual(palette[1], "RGBA")

    def test_load_1_3_via_imagepalette(self):
        # Arrange
        from PIL import ImagePalette
        # GIMP 1.3 gradient files contain a name field
        test_file = "Tests/images/gimp_gradient_with_name.ggr"

        # Act
        palette = ImagePalette.load(test_file)

        # Assert
        # load returns raw palette information
        self.assertEqual(len(palette[0]), 1024)
        self.assertEqual(palette[1], "RGBA")
