using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Cysharp.Threading.Tasks;
using Newtonsoft.Json;
using Sirenix.OdinInspector;
using UnityEngine;
using XNode;

namespace Stary.Evo.StoryEditor
{
    [Serializable]
    public class ScriptGraph : NodeGraph
    {
        /// <summary>
        /// 起始节点
        /// </summary>
        [SerializeField, ReadOnly]
        private BeginNode begin;
        /// <summary>
        /// 结束节点
        /// </summary>
        [SerializeField, ReadOnly]
        private EndNode end;

        /// <summary>
        /// 初始化标识
        /// </summary>
        [SerializeField, ReadOnly]
        private bool initialized;
        
        private void OnEnable()
        {
            if (nodes == null)
            {
                Debug.LogError("Graph异常，无有效节点列表存在");
                return;
            }

            // 初始化
            if (!initialized)
            {
                _ = DelayInitialize();
                
#if UNITY_EDITOR
                UnityEditor.EditorUtility.SetDirty(this);
#endif
            }
        }
        protected override void OnDestroy()
        {
            // 清理所有节点
            nodes.ForEach(DestroyImmediate);
            nodes.Clear();
        }

        #region 初始化

        /// <summary>
        /// 延迟初始化
        /// </summary>
        private async UniTask DelayInitialize()
        {
            // 等待Graph资产落盘
#if UNITY_EDITOR
            while (string.IsNullOrEmpty(UnityEditor.AssetDatabase.GetAssetPath(this)))
            {
                await UniTask.Delay(TimeSpan.FromSeconds(0.01));
            }
#endif

            await UniTask.Delay(TimeSpan.FromSeconds(0.01));

            // 创建初始节点
            InitBeginNode();
            InitEndNode();
            CreateSampleScriptParagraph();

            initialized = true;
        }

        /// <summary>
        /// 初始化起始节点
        /// </summary>
        private void InitBeginNode()
        {
            var existing = nodes.FirstOrDefault(n => n is BeginNode) as BeginNode;
            if (existing != null)
            {
                begin = existing;
                return;
            }

            begin = NodeBase.Create<BeginNode>(this, "Begin", Vector2.zero);
        }
        /// <summary>
        /// 初始化结束节点
        /// </summary>
        private void InitEndNode()
        {
            var existing = nodes.FirstOrDefault(n => n is EndNode) as EndNode;
            if (existing != null)
            {
                end = existing;
                return;
            }
    
            end = NodeBase.Create<EndNode>(this, "End", new Vector2(NodeBase.DefaultNodeXInterval, NodeBase.DefaultNodeYInterval)* 2);
        }
        /// <summary>
        /// 创建剧本段落样例
        /// </summary>
        private void CreateSampleScriptParagraph()
        {
            // 创建新的剧本段落
            var paragraph = ScriptParagraphNode.Create(this, $"{name}_para_sample", new Vector2(NodeBase.DefaultNodeXInterval, NodeBase.DefaultNodeYInterval));

            // 将剧本与起始节点和结束节点相连
            begin.GetOutputPort("exit").Connect(paragraph.GetInputPort("enter"));
            paragraph.GetOutputPort("exit").Connect(end.GetInputPort("enter"));
        }
        
        #endregion

        #region 导出设置

#if UNITY_EDITOR

        [BoxGroup("Export")]
        [SerializeField, ValueDropdown(nameof(GetAllAssemblyNames))]
        private string assembly;
        private IEnumerable<string> GetAllAssemblyNames() =>
            AppDomain.CurrentDomain.GetAssemblies().Select(a => a.GetName().Name).OrderBy(n => n);

        /// <summary>
        /// 获取继承 IResource 的所有类
        /// </summary>
        private HashSet<string> IResourceTypes
        {
            get
            {
                if (string.IsNullOrEmpty(assembly))
                    return new();
                var asm = AppDomain.CurrentDomain.GetAssemblies().FirstOrDefault(a => a.GetName().Name == assembly);
                return asm == null ? new() : asm.GetTypes().Where(t => t.IsClass && !t.IsAbstract && t.GetInterfaces().Any(i => i.Name == nameof(IResource))).Select(t => t.Name).ToHashSet();
            }
        }
#else
        private HashSet<string> _iResourceTypes = new();
#endif
        
        /// <summary>
        /// 资源加载方式
        /// </summary>
        [BoxGroup("Export", centerLabel:true)]
        [LabelText("资源加载方式"), ValueDropdown(nameof(IResourceTypes)),SerializeField]
        private string loaderType;
        
        private IResource _loader;
        /// <summary>
        /// 资源加载器
        /// </summary>
        public IResource Loader
        {
            get
            {
                if (_loader == null)
                {
                    var type = Type.GetType(loaderType);
                    _loader = type == null ? null : (IResource)Activator.CreateInstance(type);
                }

                return _loader;
            }
        }
        
        [BoxGroup("Export")]
        [LabelText("包体ID")]
        public string packageID;

        [BoxGroup("Export")]
        [LabelText("Graph目录地址")]
        public string graphPath;

        [BoxGroup("Export")]
        [Button("导出")]
        public async void Export()
        {
            // 资源加载方式排空
            if (Loader == null)
            {
                Debug.LogError("导出失败，没有选择资源加载方式");
                return;
            }
            
            Dictionary<Node, NodeData> dataMatch = new();
            Dictionary<NodeData, NodeBase> nodeMatch = new();
            
            // 创建图表数据
            GraphData graph = new();
            graph.name = name;
            graph.resourceType = loaderType;
            
            // 转录节点数据
            foreach (var node in nodes)
            {
                if(node is not NodeBase bNode)
                    continue;
                
                NodeData dNode = new();
                switch (bNode)
                {
                    case BeginNode beginNode:
                        dNode = await beginNode.Export();
                        break;
                    case EndNode endNode:
                        dNode = await endNode.Export();
                        break;
                    case ScriptParagraphNode paraNode:
                        dNode = await paraNode.Export();
                        break;
                    case FlowNode flowNode:
                        dNode = await flowNode.Export();
                        break;
                    default:
                        Debug.LogError($"节点{node.name}[type:{node.GetType()}]没有定义对应的数据转换逻辑，该节点将被跳过，此举将可能导致graph出现流程断裂或其他未知异常");
                        break;
                }

                dataMatch.Add(bNode, dNode);
                nodeMatch.Add(dNode, bNode);
                graph.nodes.Add(dNode);
            }

            // 转录节点连接
            foreach (var data in nodeMatch.Keys)
            {
                switch (data)
                {
                    // 起始节点
                    case BeginNodeData beginData:
                        // 记录图表首个节点的索引
                        graph.startNodeIndex = graph.nodes.IndexOf(beginData);
                        // 连接后部节点
                        nodeMatch[beginData].GetOutputPort("exit").GetConnections().ForEach(oNode => beginData.next.Add(graph.nodes.IndexOf(dataMatch[oNode.node])));
                        break;
                    // 结束节点
                    case EndNodeData endData:
                        // 连接前部节点
                        nodeMatch[endData].GetInputPort("enter").GetConnections().ForEach(oNode => endData.pre.Add(graph.nodes.IndexOf(dataMatch[oNode.node])));
                        break;
                    // 空节点（流程节点）
                    case FlowNodeData flowData:
                        // 连接前部节点
                        nodeMatch[flowData].GetInputPort("enter").GetConnections().ForEach(oNode => flowData.pre.Add(graph.nodes.IndexOf(dataMatch[oNode.node])));
                        // 连接后部节点
                        nodeMatch[flowData].GetOutputPort("exit").GetConnections().ForEach(oNode => flowData.next.Add(graph.nodes.IndexOf(dataMatch[oNode.node])));
                        break;
                    // 处理异常情况
                    default:
                        Debug.LogError($"节点{data.name}[type:{data.GetType()}]没有定义对应的数据转换逻辑，该节点将被跳过，此举将可能导致graph出现流程断裂或其他未知异常");
                        break;
                }
            }
            
            Debug.Log("转录完成");
            
            // 将转录完成的图表数据序列化为json
            var json = JsonConvert.SerializeObject(graph, new JsonSerializerSettings() { TypeNameHandling = TypeNameHandling.All });
            // 文件目录排空
            var graphFilePath = Path.Combine(Application.dataPath, graphPath.Replace(".asset", ".sg.json"));
            if (!Directory.Exists(Path.GetDirectoryName(graphFilePath)))
                Directory.CreateDirectory(Path.GetDirectoryName(graphFilePath) ?? string.Empty);
            // 写入json
            await File.WriteAllTextAsync(graphFilePath, json);
#if UNITY_EDITOR
            UnityEditor.AssetDatabase.ImportAsset(graphFilePath.Replace(Application.dataPath, "Assets"));
#endif
            
            Debug.Log("剧本导出完成");
        }

        #endregion
    }
}