using NUnit.Framework;
using BaseGames.AI;

namespace BaseGames.Tests.EditMode.AI
{
    // 顶层测试定义，供反射注册表发现
    [AiDefinition("__test_grunt")]
    internal sealed class TestGruntAi : AiScript
    {
        protected override void Build(BrainBuilder b)
        {
            b.Entry("A");
            b.State("A").To("B").When(c => c.Sensor.SeesPlayer(), "SeesPlayer");
            // 回边不可省：本夹具经 GetOrBuildGraph 走生产的 Build()，
            // 它会校验「非终态必须有出口」——夹具也得是一张能自洽运转的图
            b.State("B").To("A").When(c => !c.Sensor.SeesPlayer(), "LostPlayer");
        }
    }

    public class AiDefinitionRegistryTests
    {
        [Test]
        public void Has_FindsRegisteredDefinition()
        {
            Assert.IsTrue(AiDefinitionRegistry.Has("__test_grunt"));
        }

        [Test]
        public void GetGraph_ResolvesById()
        {
            var g = AiDefinitionRegistry.GetGraph("__test_grunt");
            Assert.AreEqual("A", g.EntryState);
        }

        [Test]
        public void GetGraph_SameId_ReturnsSharedInstance()
        {
            Assert.AreSame(
                AiDefinitionRegistry.GetGraph("__test_grunt"),
                AiDefinitionRegistry.GetGraph("__test_grunt"));
        }

        [Test]
        public void GetGraph_UnknownId_Throws()
        {
            Assert.Throws<System.InvalidOperationException>(
                () => AiDefinitionRegistry.GetGraph("__nope__"));
        }
    }
}