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# Copyright (c) 2012,
#  Sony Pictures Imageworks Inc. and
#  Industrial Light & Magic, a division of Lucasfilm Entertainment Company Ltd.
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import unittest
from alembic import Abc
from alembic import AbcMaterial

def setFloatParameter(schema, target, shaderType, paramName, value):
    prop = Abc.OFloatProperty(schema.getShaderParameters(target, shaderType),
            paramName)
    prop.setValue(value)

class MaterialAssignTest(unittest.TestCase):
    def testMaterialExport(self):
        archive = Abc.OArchive("MaterialAssignment.abc")
        root = archive.getTop()
        materials = Abc.OObject(root, "materials")
        geometry = Abc.OObject(root, "geometry")

        # parent material
        materialA = AbcMaterial.OMaterial(materials, "materialA")
        materialA.getSchema().setShader("prman", "surface", "paintedplastic")
        setFloatParameter(materialA.getSchema(),
            "prman", "surface", "Kd", 0.5)
        setFloatParameter(materialA.getSchema(),
            "prman", "surface", "roughness", 0.1)

        # child material
        materialB = AbcMaterial.OMaterial(materialA, "materialB")
        materialB.getSchema().setShader("prman", "displacement", "knobby")
        setFloatParameter(materialB.getSchema(),
            "prman", "surface", "roughness", 0.2)

        geoA = Abc.OObject(geometry, "geoA")
        AbcMaterial.addMaterialAssignment(geoA, "/materials/materialA")

        geoB = Abc.OObject(geometry, "geoB");
        AbcMaterial.addMaterialAssignment(geoB, "/materials/materialA/materialB")

        geoC = Abc.OObject(geometry, "geoC");
        AbcMaterial.addMaterialAssignment(geoC, "/materials/materialA/materialB")
        geoCMat = AbcMaterial.addMaterial(geoC);
        setFloatParameter(geoCMat, "prman", "surface", "roughness", 0.3)

    def testMaterialImport(self):
        archive = Abc.IArchive("MaterialAssignment.abc")
        root = archive.getTop()
        self.assertEqual(root.getNumChildren(), 2)

        materials = Abc.IObject(root, "materials")
        geometry = Abc.IObject(root, "geometry")

        materialA = AbcMaterial.IMaterial(materials, "materialA")
        ms = materialA.getSchema()
        self.assertEqual(ms.getShader("prman", "surface"), "paintedplastic")
        cp = ms.getShaderParameters("prman", "surface")
        kd = cp.getProperty('Kd')
        rg = cp.getProperty('roughness')
        self.assertTrue(kd.getNumSamples() == rg.getNumSamples() == 1)
        self.assertAlmostEqual(kd.samples[0], 0.5)
        self.assertAlmostEqual(rg.samples[0], 0.1)

        materialB = AbcMaterial.IMaterial(materialA, "materialB")
        ms = materialB.getSchema()
        self.assertEqual(ms.getShader("prman", "displacement"), "knobby")
        cp = ms.getShaderParameters("prman", "surface")
        rg = cp.getProperty('roughness')
        self.assertEqual(rg.getNumSamples(), 1)
        self.assertAlmostEqual(rg.samples[0], 0.2)

        geoA = Abc.IObject(geometry, "geoA")
        geoB = Abc.IObject(geometry, "geoB")
        geoC = Abc.IObject(geometry, "geoC")

        self.assertEqual(AbcMaterial.getMaterialAssignmentPath(geoA), '/materials/materialA')
        self.assertEqual(AbcMaterial.getMaterialAssignmentPath(geoB), '/materials/materialA/materialB')
        self.assertEqual(AbcMaterial.getMaterialAssignmentPath(geoC), '/materials/materialA/materialB')

        matC = AbcMaterial.hasMaterial(geoC)
        cp = matC.getShaderParameters("prman", "surface")
        rg = cp.getProperty("roughness")
        self.assertEqual(rg.getNumSamples(), 1)
        self.assertAlmostEqual(rg.samples[0], 0.3)
