using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using XNode;
using RPGCreationKit.BehaviourTree;
using UnityEditor;

namespace RPGCreationKit.BehaviourTree
{
    [CreateNodeMenu("RPGCK_BehaviourTree/SequenceNode", order = 1)]
    [System.Serializable]
    public class SequenceNode : BTNode
    {
        [Output(ShowBackingValue.Never, ConnectionType.Multiple, TypeConstraint.None)] public BTNode outputs;

        // Use this for initialization
        protected override void Init()
        {
            base.Init();
        }

        public override void ReorderChild()
        {
            List<NodePort> endPorts = GetOutputPort("outputs").GetConnections();

            List<BTNode> nodes = new List<BTNode>();

            for (int i = 0; i < endPorts.Count; i++)
                nodes.Add((endPorts[i].node as BTNode));

            nodes.Sort(SortInGraphYPos);

            for (int i = 0; i < nodes.Count; i++)
            {
                BTNode btNode = nodes[i] as BTNode;
                btNode.indexInSequence = i;
            }
        }

        // Return the correct value of an output port when requested
        public override object GetValue(NodePort port)
        {
            return null; // Replace this
        }

        public int sortbyindex(BTNode a, BTNode b)
        {
            return a.indexInSequence.CompareTo(b.indexInSequence);
        }

        public override NodeState Execute()
        {
            if (m_NodeState == NodeState.Success || m_NodeState == NodeState.Failure)
                if (hasEvaluated == true)
                    return m_NodeState;

            bool anyChildStillRunning = false;
            List<NodePort> endPorts = GetOutputPort("outputs").GetConnections();

            List<BTNode> nodes = new List<BTNode>();

            for (int i = 0; i < endPorts.Count; i++)
                nodes.Add((endPorts[i].node as BTNode));

            nodes.Sort(sortbyindex);

            for (int i = 0; i < nodes.Count; i++)
            {
                if (nodes[i].hasEvaluated)
                    continue;

                switch (nodes[i].Execute())
                {
                    case NodeState.Failure:
                        m_NodeState = NodeState.Failure;
                        hasEvaluated = true;
                        return m_NodeState;

                    case NodeState.Success:
                        continue;

                    case NodeState.Running:
                        m_NodeState = NodeState.Running;
                        anyChildStillRunning = true;
                        return m_NodeState;

                    default:
                        m_NodeState = NodeState.Running;
                        anyChildStillRunning = true;
                        return m_NodeState;
                }
            }

            m_NodeState = (anyChildStillRunning) ? NodeState.Running : NodeState.Success;

            if (m_NodeState == NodeState.Success)
                hasEvaluated = true;

            return m_NodeState;
        }

        public override void ReEvaluate()
        {
            if (m_NodeState != NodeState.Running)
            {
                base.ReEvaluate();
                hasEvaluated = false;

                List<NodePort> endPorts = GetOutputPort("outputs").GetConnections();

                for (int i = 0; i < endPorts.Count; i++)
                {
                    (endPorts[i].node as BTNode).ReEvaluate();
                }
            }
        }

        public override void OnCreateConnection(NodePort from, NodePort to)
        {
            base.OnCreateConnection(from, to);

#if UNITY_EDITOR
            EditorApplication.delayCall += ReorderChild;
#endif
        }

        public override void OnRemoveConnection(NodePort port)
        {
            if (port.fieldName == "input")
                indexInSequence = -1;
            else if (port.fieldName == "outputs")
            {
#if UNITY_EDITOR
                EditorApplication.delayCall += ReorderChild;
#endif
            }
        }

        public override void OnStart()
        {
           
        }
    }
}