using NUnit.Framework;
using BaseGames.AI;
using BaseGames.Enemies;

namespace BaseGames.Tests.EditMode.AI
{
    public class AiStateFragmentsTests
    {
        static AiRuntime Run(System.Action<BrainBuilder> build, FakeAiContext ctx)
        {
            var b = new BrainBuilder();
            b.Entry("S");
            build(b);
            return new AiRuntime(b.Build(), ctx);
        }

        [Test]
        public void Locomotion_SetsModeOnEnter()
        {
            var ctx = new FakeAiContext();
            Run(b => AiStateFragments.Locomotion(b, "S", LocomotionMode.Patrol), ctx);
            Assert.AreEqual(LocomotionMode.Patrol, ctx.L.CurrentMode);
        }

        [Test]
        public void Locomotion_FaceMode_FacesLastKnown()
        {
            var ctx = new FakeAiContext();
            ctx.S.Last = new UnityEngine.Vector2(3f, 0f);
            Run(b => AiStateFragments.Locomotion(b, "S", LocomotionMode.Face), ctx);
            Assert.AreEqual(new UnityEngine.Vector2(3f, 0f), ctx.L.FacedAt);
        }

        [Test]
        public void Ability_RetriggersOnTick_WhenNotRunning()
        {
            var ctx = new FakeAiContext();
            var rt = Run(b => AiStateFragments.Ability(b, "S", "atk"), ctx);
            Assert.AreEqual(1, ctx.C.Used.Count);
            ctx.C.Running = null;               // 模拟被受击打断
            rt.Tick(0.1f);
            Assert.AreEqual(2, ctx.C.Used.Count); // 重新触发
        }

        [Test]
        public void AbilityOnce_DoesNotRetrigger()
        {
            var ctx = new FakeAiContext();
            var rt = Run(b => AiStateFragments.AbilityOnce(b, "S", "death"), ctx);
            Assert.AreEqual(1, ctx.C.Used.Count);
            ctx.C.Running = null;               // 演出播完
            rt.Tick(0.1f);
            rt.Tick(0.1f);
            Assert.AreEqual(1, ctx.C.Used.Count); // 不重播
        }

        [Test]
        public void LostAllZones_TrueOnlyWhenBothZonesEmpty()
        {
            var ctx = new FakeAiContext();
            Assert.IsTrue(AiStateFragments.LostAllZones(ctx));
            ctx.S.Chase = true;
            Assert.IsFalse(AiStateFragments.LostAllZones(ctx));
            ctx.S.Chase = false; ctx.S.Vision = true;
            Assert.IsFalse(AiStateFragments.LostAllZones(ctx));
        }

        [Test]
        public void Locomotion_StopsOnExit()
        {
            var ctx = new FakeAiContext();
            var b = new BrainBuilder();
            b.Entry("S");
            AiStateFragments.Locomotion(b, "S", LocomotionMode.Patrol)
                .To("Out").When(x => x.Sensor.InChaseZone(), "leave");
            AiStateFragments.Terminal(b, "Out");
            var rt = new AiRuntime(b.Build(), ctx);
            Assert.AreEqual(LocomotionMode.Patrol, ctx.L.CurrentMode);

            ctx.S.Chase = true;
            rt.Tick(0.1f);
            Assert.AreEqual("Out", rt.CurrentStateName);
            CollectionAssert.Contains(ctx.L.Calls, "Stop");   // 离开时收尾
        }

        [Test]
        public void Ability_InterruptsOnExit()
        {
            var ctx = new FakeAiContext();
            var b = new BrainBuilder();
            b.Entry("S");
            AiStateFragments.Ability(b, "S", "atk")
                .To("Out").When(x => x.Sensor.InChaseZone(), "leave");
            AiStateFragments.Terminal(b, "Out");
            var rt = new AiRuntime(b.Build(), ctx);
            Assert.AreEqual("atk", ctx.C.Running);

            ctx.S.Chase = true;
            rt.Tick(0.1f);
            Assert.AreEqual("Out", rt.CurrentStateName);
            Assert.IsNull(ctx.C.Running);                     // InterruptAbilities() 已清空
        }

        [Test]
        public void Ability_Throws_WhenAbilityIdEmpty()
        {
            var b = new BrainBuilder();
            Assert.Throws<System.ArgumentException>(() => AiStateFragments.Ability(b, "S", ""));
        }

        [Test]
        public void AbilityOnce_Throws_WhenAbilityIdNull()
        {
            var b = new BrainBuilder();
            Assert.Throws<System.ArgumentException>(() => AiStateFragments.AbilityOnce(b, "S", null));
        }
    }
}