using Opsive.BehaviorDesigner.Runtime.Tasks;
using Opsive.GraphDesigner.Runtime.Variables;
using Opsive.GraphDesigner.Runtime;
using Opsive.Shared.Utility;
using UnityEngine;

namespace Cielonos.MainGame.Characters.AI
{
    [Description("检查 AI 是否在近期收到了特定的上下文事件。极度稳定，完美支持BD下沉式条件打断(Conditional Aborts)。")]
    [NodeIcon("e6fc90c130121da4f9067b5e15b02975", "69959064b54a0cb4cb077dbb6967a3e1")] 
    [Category("Cielonos/Events")]
    public class HasReceivedContextEvent : AutomataConditionalBase
    {
        [Tooltip("订阅的事件名称")]
        public SharedVariable<string> eventName;
        
        [Tooltip("事件判定的有效窗口期（秒）。超出此时长的事件将被视为过期无视。")]
        public float validWindow = 0.2f;

        [RequireShared] public SharedVariable storedValue1;
        [RequireShared] public SharedVariable storedValue2;
        [RequireShared] public SharedVariable storedValue3;
        
        public override void OnStart()
        {
            base.OnStart();
            if (behaviorSc != null && behaviorSc.EventMemory.TryGetValue(eventName.Value, out var e))
            {
                if (!e.IsValid(validWindow))
                {
                    // 如果在条件开始时就已经有事件了，但它已经过期了，那就直接丢掉它，免得后续一直误触发。
                    behaviorSc.EventMemory.Remove(eventName.Value);
                }
            }
        }

        public override TaskStatus OnUpdate()
        {
            if (Evaluate(out BehaviorSubcontroller.AutomataEvent e))
            {
                TryAssignValues(e);
                behaviorSc.EventMemory.Remove(eventName.Value);
                return TaskStatus.Success;
            }

            return TaskStatus.Failure;
        }

        public override TaskStatus OnReevaluateUpdate()
        {
            return Evaluate(out _) ? TaskStatus.Success : TaskStatus.Failure;
        }

        private bool Evaluate(out BehaviorSubcontroller.AutomataEvent e)
        {
            if (behaviorSc == null || string.IsNullOrEmpty(eventName.Value))
            {
                e = null;
                return false;
            }

            if (behaviorSc.EventMemory.TryGetValue(eventName.Value, out e))
            {
                if (e.IsValid(validWindow))
                {
                    return true;
                }
            }
            
            return false;
        }
        
        private void TryAssignValues(BehaviorSubcontroller.AutomataEvent e)
        {
            if (storedValue1 != null && storedValue1.IsShared) storedValue1.SetValue(e.Arg1);
            if (storedValue2 != null && storedValue2.IsShared) storedValue2.SetValue(e.Arg2);
            if (storedValue3 != null && storedValue3.IsShared) storedValue3.SetValue(e.Arg3);
        }
    }
}