var assert = require ('assert');
var testUtils = require ('../utils/testutils.js');

describe ('Quantities', function () {
    it ('Cube Volume Calculation', function () {
        const model = testUtils.GetModelWithOneMesh (testUtils.GetCubeMesh ());
        const volume = OV.CalculateModelVolume (model);
        assert (OV.IsEqual (volume, 1.0));
    });

    it ('Cube with Missing Face Volume Calculation', function () {
        const model = testUtils.GetModelWithOneMesh (testUtils.GetCubeWithOneMissingFaceMesh ());
        const volume = OV.CalculateModelVolume (model);
        assert.strictEqual (volume, null);
    });

    it ('Cube with Wrongly Oriented Triangle Volume Calculation', function () {
        var cube = new OV.Mesh ();
        cube.AddVertex (new OV.Coord3D (0.0, 0.0, 0.0));
        cube.AddVertex (new OV.Coord3D (1.0, 0.0, 0.0));
        cube.AddVertex (new OV.Coord3D (1.0, 1.0, 0.0));
        cube.AddVertex (new OV.Coord3D (0.0, 1.0, 0.0));
        cube.AddVertex (new OV.Coord3D (0.0, 0.0, 1.0));
        cube.AddVertex (new OV.Coord3D (1.0, 0.0, 1.0));
        cube.AddVertex (new OV.Coord3D (1.0, 1.0, 1.0));
        cube.AddVertex (new OV.Coord3D (0.0, 1.0, 1.0));
        cube.AddTriangle (new OV.Triangle (0, 1, 5));
        cube.AddTriangle (new OV.Triangle (0, 5, 4));
        cube.AddTriangle (new OV.Triangle (1, 2, 6));
        cube.AddTriangle (new OV.Triangle (1, 6, 5));
        cube.AddTriangle (new OV.Triangle (2, 3, 7));
        cube.AddTriangle (new OV.Triangle (2, 7, 6));
        cube.AddTriangle (new OV.Triangle (3, 0, 4));
        cube.AddTriangle (new OV.Triangle (3, 4, 7));
        cube.AddTriangle (new OV.Triangle (0, 3, 2));
        cube.AddTriangle (new OV.Triangle (0, 2, 1));
        cube.AddTriangle (new OV.Triangle (4, 5, 6));
        cube.AddTriangle (new OV.Triangle (4, 7, 6));
        const model = testUtils.GetModelWithOneMesh (cube);
        const volume = OV.CalculateModelVolume (model);
        assert.strictEqual (volume, null);
    });

    it ('Cube Surface Area Calculation', function () {
        const model = testUtils.GetModelWithOneMesh (testUtils.GetCubeMesh ());
        const surface = OV.CalculateModelSurfaceArea (model);
        assert (OV.IsEqual (surface, 6.0));
    });

    it ('Cube with Missing Face Surface Area Calculation', function () {
        const model = testUtils.GetModelWithOneMesh (testUtils.GetCubeWithOneMissingFaceMesh ());
        const surface = OV.CalculateModelSurfaceArea (model);
        assert (OV.IsEqual (surface, 5.0));
    });

    it ('Tetrahedron Volume Calculation', function () {
        let edgeLength = OV.CoordDistance3D (new OV.Coord3D (1.0, 1.0, 1.0), new OV.Coord3D (-1.0, -1.0, 1.0));
        const model = testUtils.GetModelWithOneMesh (testUtils.GetTetrahedronMesh ());
        const volume = OV.CalculateModelVolume (model);
        assert (OV.IsEqual (volume, Math.pow (edgeLength, 3.0) / (6.0 * Math.sqrt (2))));
    });

    it ('Tetrahedron Surface Area Calculation', function () {
        let edgeLength = OV.CoordDistance3D (new OV.Coord3D (1.0, 1.0, 1.0), new OV.Coord3D (-1.0, -1.0, 1.0));
        const model = testUtils.GetModelWithOneMesh (testUtils.GetTetrahedronMesh ());
        const surface = OV.CalculateModelSurfaceArea (model);
        assert (OV.IsEqual (surface, Math.sqrt (3) * Math.pow (edgeLength, 2.0)));
    });
});