using System;
using System.Collections.Generic;
using System.Linq;
using UniRx;
using UnityEngine;

namespace Cielonos.MainGame.Inventory
{
    public partial class ComboSubmodule : SubmoduleBase<ItemBase>
    {
        private IDisposable comboTimer;
        private IDisposable suspender;
        private float defaultDisappearTime;

        public ComboTree comboTree;
        
        public ComboSubmodule(ItemBase owner, ComboData asset) : base(owner)
        {
            this.defaultDisappearTime = asset.defaultDisappearTime;
            this.comboTree = asset.tree.ToRuntime();
            this.comboTree.Reset();
        }
        
        public ComboSubmodule(ItemBase owner, float disappearTime) : base(owner)
        {
            this.defaultDisappearTime = disappearTime;
            this.comboTree = new ComboTree();
            this.comboTree.AddNode(0, "Root");
            this.comboTree.Reset();
        }
        
        /// <summary>
        /// 设置连击计时器，在指定时间后重置连击树
        /// </summary>
        /// <param name="disappearTime">连击计时器持续时间，若小于等于0则使用默认时间</param>
        public void Setup(float disappearTime = -1)
        {
            disappearTime = disappearTime <= 0 ? defaultDisappearTime : disappearTime;
            
            comboTimer = Observable.Timer(TimeSpan.FromSeconds(disappearTime))
                .First()
                .Subscribe(_ => { comboTree.Reset(); });
        }

        /// <summary>
        /// 暂停连击计时器，在指定时间后继续重新设置连击计时器
        /// </summary>
        public void SuspendThenSetup(float duration)
        {
            comboTimer?.Dispose();
            suspender?.Dispose();
            suspender = Observable.Timer(TimeSpan.FromSeconds(duration))
                .First()
                .Subscribe(_ => Setup());
        }
        
        /// <summary>
        /// 获取当前连招节点的引用名称
        /// </summary>
        public string GetCurrentNodeName()
        {
            return comboTree.currentNode.referenceName;
        }
        
        /// <summary>
        /// 根据操作指令进入下一个连招节点
        /// </summary>
        /// <param name="operation">操作指令字符串，例如"L"，"R"</param>
        /// <param name="autoReset">若无法进入下一个节点，是否返回首个节点</param>
        /// <returns>是否成功进入下一个节点</returns>
        public bool NextCombo(string operation, bool autoReset = true)
        {
            if (comboTree.currentNode.branches.Count == 0)
            {
                comboTree.Reset();
            }

            foreach (var branch in comboTree.currentNode.branches.Where(branch => branch.operation == operation))
            {
                comboTree.lastNode = comboTree.currentNode;
                comboTree.currentNode = comboTree.nodes[branch.nextNodeIndex];
                return true;
            }

            if (autoReset)
            {
                comboTree.Reset();
                NextCombo(operation);
            }

            return false;
        }
        
        /// <summary>
        /// 直接设置连招节点
        /// </summary>
        /// <param name="index">节点索引</param>
        public void SetCombo(int index)
        {
            comboTree.lastNode = comboTree.currentNode;
            comboTree.currentNode = comboTree.nodes[index];
        }
        
        /// <summary>
        /// 直接设置连招节点
        /// </summary>
        /// <param name="refName">节点引用名称</param>
        public void SetCombo(string refName)
        {
            comboTree.lastNode = comboTree.currentNode;
            comboTree.currentNode = comboTree.nodes.Find(x => x.referenceName == refName);
        }

        /// <summary>
        /// 回退到上一个连招节点
        /// </summary>
        public void RevertCombo()
        {
            comboTree.currentNode = comboTree.lastNode;
        }

        /// <summary>
        /// 重置连招树到初始节点
        /// </summary>
        public void ResetCombo()
        {
            comboTree.Reset();
        }
    }

    public partial class ComboSubmodule
    {
        [Serializable]
        public class ComboTree
        {
            public List<Node> nodes = new();
            public Node lastNode;
            public Node currentNode;

            public void AddNode(int index, string referenceName)
            {
                nodes.Add(new Node(index, referenceName));
            }

            public void AddBranch(int nodeIndex, int nextNodeIndex, string operation)
            {
                nodes[nodeIndex].branches.Add(new Branch(nextNodeIndex, operation));
            }

            public void RemoveBranch(int nodeIndex, int nextNodeIndex, string operation)
            {
                int branchIndex = nodes[nodeIndex].branches.FindIndex(x => x.nextNodeIndex == nextNodeIndex && x.operation == operation);
                nodes[nodeIndex].branches.RemoveAt(branchIndex);
            }

            public void Reset()
            {
                currentNode = nodes[0];
            }

            [Serializable]
            public class Node
            {
                public int nodeIndex;
                public string referenceName;

                public List<Branch> branches;

                public Node(int nodeIndex, string referenceName)
                {
                    this.nodeIndex = nodeIndex;
                    this.referenceName = referenceName;
                    this.branches = new List<Branch>();
                }
            }

            [Serializable]
            public class Branch
            {
                public int nextNodeIndex;
                public string operation;

                public Branch(int nextNodeIndex, string operation)
                {
                    this.nextNodeIndex = nextNodeIndex;
                    this.operation = operation;
                }
            }
        }
    }
}