using Xunit;
using XWorld.Framework.ActorBehavior;

namespace XWorld.Framework.Tests.ActorBehavior
{
    public class BehaviorWorldTests
    {
        [Fact]
        public void TryStartBehavior_AllowsOnlyOneActiveBehavior()
        {
            BehaviorWorld world = TestWorld.CreateServerWorld();
            Assert.True(world.TryStartBehavior(1, "slash", BehaviorInput.FromDirection(1, 0)).Success);

            BehaviorStartResult second = world.TryStartBehavior(1, "slash", BehaviorInput.FromDirection(1, 0));

            Assert.False(second.Success);
            Assert.True(world.HasActiveBehavior(1));
        }

        [Fact]
        public void StopBehavior_AllowsInterruptibleBehaviorToSwitch()
        {
            BehaviorWorld world = TestWorld.CreateServerWorld();
            world.TryStartBehavior(1, "slash", BehaviorInput.FromDirection(1, 0));

            Assert.True(world.StopBehavior(1, BehaviorStopReason.Stunned));
            Assert.True(world.TryStartBehavior(1, "slash", BehaviorInput.FromDirection(1, 0)).Success);

            Assert.Contains(world.DrainEvents(), e => e.Kind == BehaviorEventKind.BehaviorStopped);
        }

        [Fact]
        public void Tick_TriggersTimelineEventsAtConfiguredTimes()
        {
            BehaviorWorld world = TestWorld.CreatePresentationWorld();
            world.TryStartBehavior(1, "slash", BehaviorInput.FromDirection(1, 0));

            world.Tick(0.26f);
            var events = world.DrainEvents();

            Assert.Contains(events, e => e.Kind == BehaviorEventKind.TimelineAnimation && e.Animation == "slash_01");
            Assert.Contains(events, e => e.Kind == BehaviorEventKind.TimelineEffect && e.Prefab == "Assets/Game/Art/Effect/slash.prefab");
        }

        [Fact]
        public void ServerLogic_SkipsPresentationEventsAndAppliesLogic()
        {
            BehaviorWorld world = TestWorld.CreateServerWorld();
            world.TryStartBehavior(1, "slash", BehaviorInput.FromDirection(1, 0));

            world.Tick(0.26f);
            var events = world.DrainEvents();

            Assert.DoesNotContain(events, e => e.Kind == BehaviorEventKind.TimelineAnimation);
            Assert.DoesNotContain(events, e => e.Kind == BehaviorEventKind.TimelineEffect);
            Assert.Contains(events, e => e.Kind == BehaviorEventKind.AttributeEffectRequested && e.TargetActorId == 2 && e.Attribute == "hp");
        }

        [Fact]
        public void Projectile_SpawnsMovesHitsAndExpiresAtHitLimit()
        {
            BehaviorWorld world = TestWorld.CreateServerWorld();

            world.TryStartBehavior(1, "slash", BehaviorInput.FromDirection(1, 0));
            world.Tick(0.33f);
            Assert.True(world.ActiveProjectileCount > 0);

            world.Tick(0.1f);
            var events = world.DrainEvents();

            Assert.Contains(events, e => e.Kind == BehaviorEventKind.ProjectileSpawned);
            Assert.Contains(events, e => e.Kind == BehaviorEventKind.ProjectileMoved);
            Assert.Contains(events, e => e.Kind == BehaviorEventKind.ProjectileHit && e.TargetActorId == 2);
            Assert.Equal(0, world.ActiveProjectileCount);
        }

        [Theory]
        [InlineData("Line")]
        [InlineData("Parabola")]
        [InlineData("Homing")]
        public void ProjectileMovementModes_UpdatePosition(string movementKind)
        {
            string fly = TestBehaviorJson.FlyObject.Replace(@"""kind"": ""Line""", @"""kind"": """ + movementKind + @"""");
            BehaviorConfigCatalog catalog = BehaviorConfigCatalog.LoadFromJson("fighter", TestBehaviorJson.Skill, fly, TestBehaviorJson.Buff);
            var world = new BehaviorWorld(new BehaviorWorldOptions { Mode = BehaviorRunMode.ClientPresentation });
            world.RegisterCatalog(catalog);
            world.AddActor(new BehaviorActorState { ActorId = 1, CatalogType = "fighter", TeamId = 1, Position = new BehaviorVector3(0, 0, 0), Forward = new BehaviorVector3(1, 0, 0), Radius = 0.3f, Alive = true });
            world.AddActor(new BehaviorActorState { ActorId = 2, CatalogType = "fighter", TeamId = 2, Position = new BehaviorVector3(4, 0, 0), Forward = new BehaviorVector3(-1, 0, 0), Radius = 0.3f, Alive = true });

            world.TryStartBehavior(1, "slash", BehaviorInput.FromTargetActor(2));
            world.Tick(0.33f);
            world.DrainEvents();
            world.Tick(0.1f);

            Assert.Contains(world.DrainEvents(), e => e.Kind == BehaviorEventKind.ProjectileMoved && e.Position.X > 0);
        }
    }

    internal static class TestWorld
    {
        public static BehaviorWorld CreateServerWorld()
        {
            return Create(BehaviorRunMode.ServerLogic);
        }

        public static BehaviorWorld CreatePresentationWorld()
        {
            return Create(BehaviorRunMode.ClientPresentation);
        }

        private static BehaviorWorld Create(BehaviorRunMode mode)
        {
            BehaviorConfigCatalog catalog = BehaviorConfigCatalog.LoadFromJson(
                "fighter",
                TestBehaviorJson.Skill,
                TestBehaviorJson.FlyObject,
                TestBehaviorJson.Buff);
            var world = new BehaviorWorld(new BehaviorWorldOptions { Mode = mode });
            world.RegisterCatalog(catalog);
            world.AddActor(new BehaviorActorState { ActorId = 1, CatalogType = "fighter", TeamId = 1, Position = new BehaviorVector3(0, 0, 0), Forward = new BehaviorVector3(1, 0, 0), Radius = 0.3f, Alive = true });
            world.AddActor(new BehaviorActorState { ActorId = 2, CatalogType = "fighter", TeamId = 2, Position = new BehaviorVector3(1, 0, 0), Forward = new BehaviorVector3(-1, 0, 0), Radius = 0.3f, Alive = true });
            return world;
        }
    }
}