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 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
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using System.Collections.Generic;
using NUnit.Framework;
using OpenSim.Tests.Common;
using OpenSim.Region.ScriptEngine.Shared;
using OpenSim.Tests.Common.Setup;
using OpenSim.Region.Framework.Scenes;
using Nini.Config;
using OpenSim.Region.ScriptEngine.Shared.Api;
using OpenMetaverse;
using System;

namespace OpenSim.Region.ScriptEngine.Shared.Tests
{
    /// <summary>
    /// Tests for LSL_Api
    /// </summary>
    [TestFixture]
    public class LSL_ApiTest
    {

        private const double ANGLE_ACCURACY_IN_RADIANS = 1E-7;
        private LSL_Api lslApi;

        [SetUp]
        public void SetUp()
        {

            IniConfigSource initConfigSource = new IniConfigSource();
            IConfig config = initConfigSource.AddConfig("XEngine");
            config.Set("Enabled", "true");

            Scene scene = SceneSetupHelpers.SetupScene();
            SceneObjectPart part = SceneSetupHelpers.AddSceneObject(scene);

            XEngine.XEngine engine = new XEngine.XEngine();
            engine.Initialise(scene, initConfigSource);

            lslApi = new LSL_Api();
            lslApi.Initialize(engine, part, part.LocalId, part.UUID);

        }

        [Test]
        public void TestllAngleBetween()
        {
            TestllAngleBetween(new Vector3(1, 0, 0), 0);
            TestllAngleBetween(new Vector3(1, 0, 0), 90);
            TestllAngleBetween(new Vector3(1, 0, 0), 180);
            TestllAngleBetween(new Vector3(1, 0, 0), 270);

            TestllAngleBetween(new Vector3(0, 1, 0), 0);
            TestllAngleBetween(new Vector3(0, 1, 0), 90);
            TestllAngleBetween(new Vector3(0, 1, 0), 180);
            TestllAngleBetween(new Vector3(0, 1, 0), 270);

            TestllAngleBetween(new Vector3(0, 0, 1), 0);
            TestllAngleBetween(new Vector3(0, 0, 1), 90);
            TestllAngleBetween(new Vector3(0, 0, 1), 180);
            TestllAngleBetween(new Vector3(0, 0, 1), 270);

            TestllAngleBetween(new Vector3(1, 1, 1), 0);
            TestllAngleBetween(new Vector3(1, 1, 1), 90);
            TestllAngleBetween(new Vector3(1, 1, 1), 180);
            TestllAngleBetween(new Vector3(1, 1, 1), 270);
        }

        private void TestllAngleBetween(Vector3 axis,float originalAngle)
        {
            Quaternion rotation1 = Quaternion.CreateFromAxisAngle(axis, 0);
            Quaternion rotation2 = Quaternion.CreateFromAxisAngle(axis, ToRadians(originalAngle));

            double deducedAngle = FromLslFloat(lslApi.llAngleBetween(ToLslQuaternion(rotation2), ToLslQuaternion(rotation1)));

            Assert.Greater(deducedAngle, ToRadians(originalAngle) - ANGLE_ACCURACY_IN_RADIANS);
            Assert.Less(deducedAngle, ToRadians(originalAngle) + ANGLE_ACCURACY_IN_RADIANS);
        }

        #region Conversions to and from LSL_Types

        private float ToRadians(double degrees)
        {
            return (float)(Math.PI * degrees / 180);
        }

        private double FromRadians(float radians)
        {
            return radians * 180 / Math.PI;
        }

        private double FromLslFloat(LSL_Types.LSLFloat lslFloat)
        {
            return lslFloat.value;
        }

        private LSL_Types.LSLFloat ToLslFloat(double value)
        {
            return new LSL_Types.LSLFloat(value);
        }

        private Quaternion FromLslQuaternion(LSL_Types.Quaternion lslQuaternion)
        {
            return new Quaternion((float)lslQuaternion.x, (float)lslQuaternion.y, (float)lslQuaternion.z, (float)lslQuaternion.s);
        }

        private LSL_Types.Quaternion ToLslQuaternion(Quaternion quaternion)
        {
            return new LSL_Types.Quaternion(quaternion.X, quaternion.Y, quaternion.Z, quaternion.W);
        }

        #endregion

    }
}