using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;
using UnityEditor;
using Object = UnityEngine.Object;

namespace AssetDependencyGraph
{
    public interface IDependencyAnalysis
    {
        void Analyze(string path, Dictionary<AssetIdentify, AssetNode> result);

        public (AssetIdentify id, AssetNode node) GetOrCreateFolderNode(string path, Dictionary<AssetIdentify, AssetNode> result)
        {
            AssetIdentify k = null;

            foreach (var item in result.Keys)
            {
                if (item.Path == path)
                {
                    k = item;
                }
            }

            if (k == null)
            {
                k = new AssetIdentify()
                {
                    Path = path,
                    AssetType = "Folder",
                    Guid = null,
                    Md5 = null
                };
                result[k] = new FolderNode()
                {
                    Self = k,
                    AssetType = "Folder",
                };
            }

            return (k, result[k]);
        }

        public (AssetIdentify id, AssetNode node) GetOrCreateAssetNode(string path, Dictionary<AssetIdentify, AssetNode> result)
        {
            AssetIdentify k = null;

            foreach (var item in result.Keys)
            {
                if (item.Path == path)
                {
                    k = item;
                }
            }

            if (k == null)
            {
                k = new AssetIdentify()
                {
                    Path = path,
                    Guid = null,
                    Md5 = Utils.Md5(path)
                };
                if (path.EndsWith(".prefab") || path.EndsWith(".unity"))
                {
                    result[k] = new PackageNode()
                    {
                        Self = k,
                    };
                }
                else
                {
                    result[k] = new AssetNode()
                    {
                        Self = k,
                    };
                }
            }

            return (k, result[k]);
        }

        public bool Exclude(string path) => path.EndsWith(".meta");

        public string GetTypeByExtension(string ext)
        {
            switch (ext.ToLowerInvariant())
            {
                case ".a":
                case ".dll":
                case ".so":
                case ".exe":
                case ".dynlib":
                    return "Executable";
                case ".asmdef":
                case ".asmref":
                    return "UnityAssembly";
                case ".cs":
                case ".lua":
                case ".js":
                case ".ts":
                case ".java":
                case ".h":
                case ".cpp":
                case ".cxx":
                case ".mm":
                    return "SourceFile";
                case ".json":
                case ".json5":
                    return "JsonFile";
                case ".xml":
                    return "XmlFile";
                case ".dat":
                    return "DatFile";
                default:
                    return null;
            }
        }
    }

    public class UnityDependencyAnalysis : IDependencyAnalysis
    {
        HashSet<string> processed = new();

        public void Analyze(string path, Dictionary<AssetIdentify, AssetNode> result)
        {
            if (!processed.Add(path))
            {
                return;
            }
            var dependencyAnalysis = (this as IDependencyAnalysis);

            var kv = dependencyAnalysis.GetOrCreateAssetNode(path, result);
            var relatePath = path.ToUnityRelatePath();
            kv.id.Guid = AssetDatabase.AssetPathToGUID(relatePath);
            var selfNode = kv.node;
            if (dependencyAnalysis.GetTypeByExtension(Path.GetExtension(path)) is string assetType && assetType != null)
            {
                kv.id.AssetType = assetType;
                selfNode.AssetType = assetType;
            }
            else
            {
                if (relatePath.EndsWith("Rock_01_Prefab.prefab"))
                {
                    Console.WriteLine();
                }
                Object mainObject = AssetDatabase.LoadMainAssetAtPath(relatePath);
                if (mainObject != null)
                {
                    var prefabType = PrefabUtility.GetPrefabAssetType(mainObject);
                    if (prefabType != PrefabAssetType.NotAPrefab)
                    {
                        selfNode.AssetType = prefabType.ToString();
                    }
                    else
                    {
                        selfNode.AssetType = mainObject.GetType().Name;
                    }
                    kv.id.AssetType = selfNode.AssetType;

                    string[] dependencies = AssetDatabase.GetDependencies(relatePath, false);
                    for (int i = 0; i < dependencies.Length; i++)
                    {
                        var dep = dependencies[i].ToUnityFullPath();
                        var depkv = dependencyAnalysis.GetOrCreateAssetNode(dep, result);
                        depkv.node.Dependent.Add(selfNode.Self);
                        selfNode.Dependencies.Add(depkv.id);
                        Analyze(dep, result);
                    }
                }
                else
                {
                    UnityEngine.Debug.LogWarning("unknown type:" + path);
                }
            }
        }

    }

    public class FolderDependencyAnalysis : IDependencyAnalysis
    {
        public void Analyze(string path, Dictionary<AssetIdentify, AssetNode> result)
        {
            var dependencyAnalysis = (this as IDependencyAnalysis);
            var k = dependencyAnalysis.GetOrCreateFolderNode(path, result);

            Utils.TraverseDirectory(path, (p) =>
            {
                p = p.ToUniversalPath();

                if (dependencyAnalysis.Exclude(p))
                {
                    return;
                }

                var selfNode = result[k.id];
                if (Directory.Exists(p))
                {
                    var kv = dependencyAnalysis.GetOrCreateFolderNode(p, result);
                    kv.node.Dependent.Add(selfNode.Self);
                    selfNode.Dependencies.Add(kv.id);
                }
                else if (File.Exists(p))
                {
                    var kv = dependencyAnalysis.GetOrCreateAssetNode(p, result);

                    kv.node.Dependent.Add(selfNode.Self);
                    selfNode.Dependencies.Add(kv.id);
                }
            }, 1);
        }
    }

    internal class DependencyAnalyzer
    {
        private Dictionary<Predicate<string>, IDependencyAnalysis> dependencyAnalysisDic = new();
        private Dictionary<AssetIdentify, AssetNode> assetIdentify2AssetNodeDic = new();

        private bool Exclude(string path) => path.EndsWith(".meta");

        public DependencyAnalyzer()
        {
            dependencyAnalysisDic.Add(new Predicate<string>(path => !Directory.Exists(path)), new UnityDependencyAnalysis());
            dependencyAnalysisDic.Add(new Predicate<string>(path => Directory.Exists(path)), new FolderDependencyAnalysis());
        }

        private void Visivt(string path)
        {
            path = path.ToUniversalPath();
            if (Exclude(path))
            {
                return;
            }
            foreach (var item in dependencyAnalysisDic)
            {
                if (item.Key(path))
                {
                    item.Value.Analyze(path, assetIdentify2AssetNodeDic);
                }
            }
        }

        public void Analyze(string rootFolder)
        {
            Stopwatch sw = Stopwatch.StartNew();
            sw.Start();
            Utils.TraverseDirectory(rootFolder, Visivt, -1);
            sw.Stop();
            UnityEngine.Debug.Log($"分析引用耗时:{sw.ElapsedMilliseconds / 1000f}s");
            AssetDependencyGraphDB db = new AssetDependencyGraphDB("admin", "CCS20190109", "10.225.0.170");
            sw.Restart();
            db.Clean();
            Parallel.ForEach(assetIdentify2AssetNodeDic, item =>
            {
                db.UpdateOrInsert(item.Value);
            });
            sw.Stop();
            UnityEngine.Debug.Log($"更新数据库:{sw.ElapsedMilliseconds / 1000f}s");
        }
    }
}