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using System;
using System.Reflection;
using Nini.Config;
using NUnit.Framework;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Framework.Communications;
using OpenSim.Framework.Servers;
using OpenSim.Region.Framework.Interfaces;
using OpenSim.Region.CoreModules.Framework;
using OpenSim.Region.CoreModules.Framework.EntityTransfer;
using OpenSim.Region.CoreModules.ServiceConnectorsOut.Simulation;
using OpenSim.Region.CoreModules.World.Permissions;
using OpenSim.Tests.Common;
using OpenSim.Tests.Common.Mock;
using System.IO;
using System.Text;

namespace OpenSim.Region.Framework.Scenes.Tests
{
    /// <summary>
    /// Teleport tests in a standalone OpenSim
    /// </summary>
    [TestFixture]
    public class ScenePresenceTeleportTests : OpenSimTestCase
    {
        [TestFixtureSetUp]
        public void FixtureInit()
        {
            // Don't allow tests to be bamboozled by asynchronous events.  Execute everything on the same thread.
            Util.FireAndForgetMethod = FireAndForgetMethod.RegressionTest;
        }

        [TestFixtureTearDown]
        public void TearDown()
        {
            // We must set this back afterwards, otherwise later tests will fail since they're expecting multiple
            // threads.  Possibly, later tests should be rewritten so none of them require async stuff (which regression
            // tests really shouldn't).
            Util.FireAndForgetMethod = Util.DefaultFireAndForgetMethod;
        }

        [Test]
        public void TestSameRegionTeleport()
        {
            TestHelpers.InMethod();
//            log4net.Config.XmlConfigurator.Configure();

            EntityTransferModule etm = new EntityTransferModule();

            IConfigSource config = new IniConfigSource();
            config.AddConfig("Modules");
            // Not strictly necessary since FriendsModule assumes it is the default (!)
            config.Configs["Modules"].Set("EntityTransferModule", etm.Name);

            TestScene scene = new SceneHelpers().SetupScene("sceneA", TestHelpers.ParseTail(0x100), 1000, 1000);
            SceneHelpers.SetupSceneModules(scene, config, etm);

            Vector3 teleportPosition = new Vector3(10, 11, 12);
            Vector3 teleportLookAt = new Vector3(20, 21, 22);

            ScenePresence sp = SceneHelpers.AddScenePresence(scene, TestHelpers.ParseTail(0x1));
            sp.AbsolutePosition = new Vector3(30, 31, 32);
            scene.RequestTeleportLocation(
                sp.ControllingClient,
                scene.RegionInfo.RegionHandle,
                teleportPosition,
                teleportLookAt,
                (uint)TeleportFlags.ViaLocation);

            Assert.That(sp.AbsolutePosition, Is.EqualTo(teleportPosition));

            Assert.That(scene.GetRootAgentCount(), Is.EqualTo(1));
            Assert.That(scene.GetChildAgentCount(), Is.EqualTo(0));

            // Lookat is sent to the client only - sp.Lookat does not yield the same thing (calculation from camera
            // position instead).
//            Assert.That(sp.Lookat, Is.EqualTo(teleportLookAt));
        }

        [Test]
        public void TestSameSimulatorSeparatedRegionsTeleport()
        {
            TestHelpers.InMethod();
//            log4net.Config.XmlConfigurator.Configure();

            UUID userId = TestHelpers.ParseTail(0x1);

            EntityTransferModule etmA = new EntityTransferModule();
            EntityTransferModule etmB = new EntityTransferModule();
            LocalSimulationConnectorModule lscm = new LocalSimulationConnectorModule();

            IConfigSource config = new IniConfigSource();
            IConfig modulesConfig = config.AddConfig("Modules");
            modulesConfig.Set("EntityTransferModule", etmA.Name);
            modulesConfig.Set("SimulationServices", lscm.Name);
            IConfig entityTransferConfig = config.AddConfig("EntityTransfer");

            // In order to run a single threaded regression test we do not want the entity transfer module waiting
            // for a callback from the destination scene before removing its avatar data.
            entityTransferConfig.Set("wait_for_callback", false);

            SceneHelpers sh = new SceneHelpers();
            TestScene sceneA = sh.SetupScene("sceneA", TestHelpers.ParseTail(0x100), 1000, 1000);
            TestScene sceneB = sh.SetupScene("sceneB", TestHelpers.ParseTail(0x200), 1002, 1000);

            SceneHelpers.SetupSceneModules(sceneA, config, etmA);
            SceneHelpers.SetupSceneModules(sceneB, config, etmB);
            SceneHelpers.SetupSceneModules(new Scene[] { sceneA, sceneB }, config, lscm);

            Vector3 teleportPosition = new Vector3(10, 11, 12);
            Vector3 teleportLookAt = new Vector3(20, 21, 22);

            ScenePresence sp = SceneHelpers.AddScenePresence(sceneA, userId, sh.SceneManager);
            sp.AbsolutePosition = new Vector3(30, 31, 32);

            // XXX: A very nasty hack to tell the client about the destination scene without having to crank the whole
            // UDP stack (?)
//            ((TestClient)sp.ControllingClient).TeleportTargetScene = sceneB;

            sceneA.RequestTeleportLocation(
                sp.ControllingClient,
                sceneB.RegionInfo.RegionHandle,
                teleportPosition,
                teleportLookAt,
                (uint)TeleportFlags.ViaLocation);

            ((TestClient)sp.ControllingClient).CompleteTeleportClientSide();

            Assert.That(sceneA.GetScenePresence(userId), Is.Null);

            ScenePresence sceneBSp = sceneB.GetScenePresence(userId);
            Assert.That(sceneBSp, Is.Not.Null);
            Assert.That(sceneBSp.Scene.RegionInfo.RegionName, Is.EqualTo(sceneB.RegionInfo.RegionName));
            Assert.That(sceneBSp.AbsolutePosition, Is.EqualTo(teleportPosition));

            Assert.That(sceneA.GetRootAgentCount(), Is.EqualTo(0));
            Assert.That(sceneA.GetChildAgentCount(), Is.EqualTo(0));
            Assert.That(sceneB.GetRootAgentCount(), Is.EqualTo(1));
            Assert.That(sceneB.GetChildAgentCount(), Is.EqualTo(0));

            // TODO: Add assertions to check correct circuit details in both scenes.

            // Lookat is sent to the client only - sp.Lookat does not yield the same thing (calculation from camera
            // position instead).
//            Assert.That(sp.Lookat, Is.EqualTo(teleportLookAt));
        }

        /// <summary>
        /// Test teleport procedures when the target simulator returns false when queried about access.
        /// </summary>
        [Test]
        public void TestSameSimulatorSeparatedRegionsQueryAccessFails()
        {
            TestHelpers.InMethod();
//            TestHelpers.EnableLogging();

            UUID userId = TestHelpers.ParseTail(0x1);
            Vector3 preTeleportPosition = new Vector3(30, 31, 32);

            EntityTransferModule etmA = new EntityTransferModule();
            EntityTransferModule etmB = new EntityTransferModule();

            LocalSimulationConnectorModule lscm = new LocalSimulationConnectorModule();

            IConfigSource config = new IniConfigSource();
            config.AddConfig("Modules");
            config.Configs["Modules"].Set("EntityTransferModule", etmA.Name);
            config.Configs["Modules"].Set("SimulationServices", lscm.Name);

            config.AddConfig("EntityTransfer");

            // In order to run a single threaded regression test we do not want the entity transfer module waiting
            // for a callback from the destination scene before removing its avatar data.
            config.Configs["EntityTransfer"].Set("wait_for_callback", false);

            config.AddConfig("Startup");
            config.Configs["Startup"].Set("serverside_object_permissions", true);

            SceneHelpers sh = new SceneHelpers();
            TestScene sceneA = sh.SetupScene("sceneA", TestHelpers.ParseTail(0x100), 1000, 1000);
            TestScene sceneB = sh.SetupScene("sceneB", TestHelpers.ParseTail(0x200), 1002, 1000);

            SceneHelpers.SetupSceneModules(sceneA, config, etmA );

            // We need to set up the permisions module on scene B so that our later use of agent limit to deny
            // QueryAccess won't succeed anyway because administrators are always allowed in and the default
            // IsAdministrator if no permissions module is present is true.
            SceneHelpers.SetupSceneModules(sceneB, config, new object[] { new PermissionsModule(), etmB });

            // Shared scene modules
            SceneHelpers.SetupSceneModules(new Scene[] { sceneA, sceneB }, config, lscm);

            Vector3 teleportPosition = new Vector3(10, 11, 12);
            Vector3 teleportLookAt = new Vector3(20, 21, 22);

            ScenePresence sp = SceneHelpers.AddScenePresence(sceneA, userId, sh.SceneManager);
            sp.AbsolutePosition = preTeleportPosition;

            // Make sceneB return false on query access
            sceneB.RegionInfo.RegionSettings.AgentLimit = 0;

            sceneA.RequestTeleportLocation(
                sp.ControllingClient,
                sceneB.RegionInfo.RegionHandle,
                teleportPosition,
                teleportLookAt,
                (uint)TeleportFlags.ViaLocation);

//            ((TestClient)sp.ControllingClient).CompleteTeleportClientSide();

            Assert.That(sceneB.GetScenePresence(userId), Is.Null);

            ScenePresence sceneASp = sceneA.GetScenePresence(userId);
            Assert.That(sceneASp, Is.Not.Null);
            Assert.That(sceneASp.Scene.RegionInfo.RegionName, Is.EqualTo(sceneA.RegionInfo.RegionName));
            Assert.That(sceneASp.AbsolutePosition, Is.EqualTo(preTeleportPosition));

            Assert.That(sceneA.GetRootAgentCount(), Is.EqualTo(1));
            Assert.That(sceneA.GetChildAgentCount(), Is.EqualTo(0));
            Assert.That(sceneB.GetRootAgentCount(), Is.EqualTo(0));
            Assert.That(sceneB.GetChildAgentCount(), Is.EqualTo(0));

            // TODO: Add assertions to check correct circuit details in both scenes.

            // Lookat is sent to the client only - sp.Lookat does not yield the same thing (calculation from camera
            // position instead).
//            Assert.That(sp.Lookat, Is.EqualTo(teleportLookAt));

//            TestHelpers.DisableLogging();
        }

        /// <summary>
        /// Test teleport procedures when the target simulator create agent step is refused.
        /// </summary>
        [Test]
        public void TestSameSimulatorSeparatedRegionsCreateAgentFails()
        {
            TestHelpers.InMethod();
//            TestHelpers.EnableLogging();

            UUID userId = TestHelpers.ParseTail(0x1);
            Vector3 preTeleportPosition = new Vector3(30, 31, 32);

            EntityTransferModule etmA = new EntityTransferModule();
            EntityTransferModule etmB = new EntityTransferModule();
            LocalSimulationConnectorModule lscm = new LocalSimulationConnectorModule();

            IConfigSource config = new IniConfigSource();
            config.AddConfig("Modules");
            config.Configs["Modules"].Set("EntityTransferModule", etmA.Name);
            config.Configs["Modules"].Set("SimulationServices", lscm.Name);

            config.AddConfig("EntityTransfer");

            // In order to run a single threaded regression test we do not want the entity transfer module waiting
            // for a callback from the destination scene before removing its avatar data.
            config.Configs["EntityTransfer"].Set("wait_for_callback", false);

            SceneHelpers sh = new SceneHelpers();
            TestScene sceneA = sh.SetupScene("sceneA", TestHelpers.ParseTail(0x100), 1000, 1000);
            TestScene sceneB = sh.SetupScene("sceneB", TestHelpers.ParseTail(0x200), 1002, 1000);

            SceneHelpers.SetupSceneModules(sceneA, config, etmA);
            SceneHelpers.SetupSceneModules(sceneB, config, etmB);

            // Shared scene modules
            SceneHelpers.SetupSceneModules(new Scene[] { sceneA, sceneB }, config, lscm);

            Vector3 teleportPosition = new Vector3(10, 11, 12);
            Vector3 teleportLookAt = new Vector3(20, 21, 22);

            ScenePresence sp = SceneHelpers.AddScenePresence(sceneA, userId, sh.SceneManager);
            sp.AbsolutePosition = preTeleportPosition;

            // Make sceneB refuse CreateAgent
            sceneB.LoginsEnabled = false;

            sceneA.RequestTeleportLocation(
                sp.ControllingClient,
                sceneB.RegionInfo.RegionHandle,
                teleportPosition,
                teleportLookAt,
                (uint)TeleportFlags.ViaLocation);

//            ((TestClient)sp.ControllingClient).CompleteTeleportClientSide();

            Assert.That(sceneB.GetScenePresence(userId), Is.Null);

            ScenePresence sceneASp = sceneA.GetScenePresence(userId);
            Assert.That(sceneASp, Is.Not.Null);
            Assert.That(sceneASp.Scene.RegionInfo.RegionName, Is.EqualTo(sceneA.RegionInfo.RegionName));
            Assert.That(sceneASp.AbsolutePosition, Is.EqualTo(preTeleportPosition));

            Assert.That(sceneA.GetRootAgentCount(), Is.EqualTo(1));
            Assert.That(sceneA.GetChildAgentCount(), Is.EqualTo(0));
            Assert.That(sceneB.GetRootAgentCount(), Is.EqualTo(0));
            Assert.That(sceneB.GetChildAgentCount(), Is.EqualTo(0));

            // TODO: Add assertions to check correct circuit details in both scenes.

            // Lookat is sent to the client only - sp.Lookat does not yield the same thing (calculation from camera
            // position instead).
//            Assert.That(sp.Lookat, Is.EqualTo(teleportLookAt));

//            TestHelpers.DisableLogging();
        }

        [Test]
        public void TestSameSimulatorNeighbouringRegionsTeleport()
        {
            TestHelpers.InMethod();
//            TestHelpers.EnableLogging();

            UUID userId = TestHelpers.ParseTail(0x1);

            EntityTransferModule etmA = new EntityTransferModule();
            EntityTransferModule etmB = new EntityTransferModule();
            LocalSimulationConnectorModule lscm = new LocalSimulationConnectorModule();

            IConfigSource config = new IniConfigSource();
            IConfig modulesConfig = config.AddConfig("Modules");
            modulesConfig.Set("EntityTransferModule", etmA.Name);
            modulesConfig.Set("SimulationServices", lscm.Name);
            IConfig entityTransferConfig = config.AddConfig("EntityTransfer");

            // In order to run a single threaded regression test we do not want the entity transfer module waiting
            // for a callback from the destination scene before removing its avatar data.
            entityTransferConfig.Set("wait_for_callback", false);

            SceneHelpers sh = new SceneHelpers();
            TestScene sceneA = sh.SetupScene("sceneA", TestHelpers.ParseTail(0x100), 1000, 1000);
            TestScene sceneB = sh.SetupScene("sceneB", TestHelpers.ParseTail(0x200), 1001, 1000);

            SceneHelpers.SetupSceneModules(new Scene[] { sceneA, sceneB }, config, lscm);
            SceneHelpers.SetupSceneModules(sceneA, config, new CapabilitiesModule(), etmA);
            SceneHelpers.SetupSceneModules(sceneB, config, new CapabilitiesModule(), etmB);

            Vector3 teleportPosition = new Vector3(10, 11, 12);
            Vector3 teleportLookAt = new Vector3(20, 21, 22);

            ScenePresence originalSp = SceneHelpers.AddScenePresence(sceneA, userId, sh.SceneManager);
            originalSp.AbsolutePosition = new Vector3(30, 31, 32);

            ScenePresence beforeSceneASp = sceneA.GetScenePresence(userId);
            Assert.That(beforeSceneASp, Is.Not.Null);
            Assert.That(beforeSceneASp.IsChildAgent, Is.False);

            ScenePresence beforeSceneBSp = sceneB.GetScenePresence(userId);
            Assert.That(beforeSceneBSp, Is.Not.Null);
            Assert.That(beforeSceneBSp.IsChildAgent, Is.True);

            // XXX: A very nasty hack to tell the client about the destination scene without having to crank the whole
            // UDP stack (?)
//            ((TestClient)beforeSceneASp.ControllingClient).TeleportTargetScene = sceneB;

            sceneA.RequestTeleportLocation(
                beforeSceneASp.ControllingClient,
                sceneB.RegionInfo.RegionHandle,
                teleportPosition,
                teleportLookAt,
                (uint)TeleportFlags.ViaLocation);

            ((TestClient)beforeSceneASp.ControllingClient).CompleteTeleportClientSide();

            ScenePresence afterSceneASp = sceneA.GetScenePresence(userId);
            Assert.That(afterSceneASp, Is.Not.Null);
            Assert.That(afterSceneASp.IsChildAgent, Is.True);

            ScenePresence afterSceneBSp = sceneB.GetScenePresence(userId);
            Assert.That(afterSceneBSp, Is.Not.Null);
            Assert.That(afterSceneBSp.IsChildAgent, Is.False);
            Assert.That(afterSceneBSp.Scene.RegionInfo.RegionName, Is.EqualTo(sceneB.RegionInfo.RegionName));
            Assert.That(afterSceneBSp.AbsolutePosition, Is.EqualTo(teleportPosition));

            Assert.That(sceneA.GetRootAgentCount(), Is.EqualTo(0));
            Assert.That(sceneA.GetChildAgentCount(), Is.EqualTo(1));
            Assert.That(sceneB.GetRootAgentCount(), Is.EqualTo(1));
            Assert.That(sceneB.GetChildAgentCount(), Is.EqualTo(0));

            // TODO: Add assertions to check correct circuit details in both scenes.

            // Lookat is sent to the client only - sp.Lookat does not yield the same thing (calculation from camera
            // position instead).
//            Assert.That(sp.Lookat, Is.EqualTo(teleportLookAt));

//            TestHelpers.DisableLogging();
        }
    }
}