using System;
using System.Collections.Generic;
using System.Linq;
using Cielonos.MainGame.Characters;
using UniRx;
using UnityEngine;

namespace Cielonos.MainGame.Characters.Inventory
{
    public partial class ComboSubmodule : SubmoduleBase<ItemBase>
    {
        public Dictionary<string, ComboTree> comboTrees;
        public ComboTree main => comboTrees["Main"];
        public ComboTree this[string name] => comboTrees[name];
        
        public ComboSubmodule(ItemBase owner, ComboData asset) : base(owner)
        {
            this.comboTrees = new Dictionary<string, ComboTree>();
            foreach (KeyValuePair<string, ComboTreeData> treeData in asset.comboTrees)
            {
                comboTrees[treeData.Key] = treeData.Value.ToRuntime(this);
                comboTrees[treeData.Key].Reset();
            }
        }
    }

    public partial class ComboSubmodule
    {
        public partial class ComboTree : SubmoduleBase<ComboSubmodule>
        {
            private Player player => owner.owner.player;
            
            private IDisposable comboTimer;
            private IDisposable suspender;
            private float resetTime;
            
            public List<Node> nodes;
            public Node lastNode;
            public Node currentNode;

            public ComboTree(ComboSubmodule owner, float resetTime) : base(owner)
            {
                this.resetTime = resetTime;
                this.nodes = new List<Node>();
            }

            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];
            }
        }

        public partial class ComboTree
        {
            /// <summary>
            /// 设置连击计时器，在指定时间后重置连击树
            /// </summary>
            /// <param name="overrideResetTime">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 overrideResetTime = -1)
            {
                overrideResetTime = overrideResetTime <= 0 ? resetTime : overrideResetTime;
                comboTimer = player.selfTimeSm.AddLocalTimer(overrideResetTime, 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 = player.selfTimeSm.AddLocalTimer(duration, () => Setup());
            }

            /// <summary>
            /// 获取当前连招节点的引用名称
            /// </summary>
            public string GetCurrentNodeName()
            {
                return currentNode.referenceName;
            }
            
            /// <summary>
            /// 获取当前连招节点的下一个节点的引用名称，如果没有符合条件的下一个节点，则返回首个节点的引用名称
            /// </summary>
            public string GetNextNodeName(string operation)
            {
                foreach (var branch in currentNode.branches.Where(branch => branch.operation == operation))
                {
                    return nodes[branch.nextNodeIndex].referenceName;
                }
                
                return nodes[0].branches.Where(branch => branch.operation == operation)
                    .Select(branch => nodes[branch.nextNodeIndex].referenceName).FirstOrDefault();
            }

            /// <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 (currentNode.branches.Count == 0)
                {
                    Reset();
                }

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

                if (autoReset)
                {
                    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)
            {
                lastNode = currentNode;
                currentNode = 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)
            {
                lastNode = currentNode;
                currentNode = nodes.Find(x => x.referenceName == refName);
            }

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

        public partial class ComboTree
        {
            [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;
                }
            }
        }
    }
}