using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using UnityEditor;
using UnityEngine;

namespace MetaCity.BundleKit.Editor
{
    public enum MetacityBundleType
    {
        Prefab,
        Scene,
        Avatar,
        SpawnPoints
    }
    
    public class MetacityBundle
    {
        public MetacityBundleType BundleType;
        public AssetBundleBuild BundleBuild;
        public bool NeedUpload;
    }
    public enum PlayMode
    {
        SinglePlayer,
        MultiPlayer
    }

    public enum WebUrl
    {
        LocalTesting,
        MetacityInt,
        U3D
    }
    [Serializable]
    public class BuildBundleConfig
    {
        public PlayMode playMode;
        public MetacityBundleType curType;
        public string bundleName;
        public bool needBuild;
    }

    [System.Serializable]
    public class BuildMainConfig
    {
        public PlayMode mPlayMode;
        public WebUrl mWebUrl;
        public bool mCustomize = false;

        public List<BuildBundleConfig> bundleConfigs = new List<BuildBundleConfig>();

        private BuildBundleConfig TryGetConfig(string bundleName, MetacityBundleType bundleType, bool createIfNotExists = false)
        {
            if (bundleConfigs != null)
            {
                foreach (var bundle in bundleConfigs)
                {
                    if (bundle.bundleName == bundleName && bundle.curType == bundleType)
                    {
                        return bundle;
                    }
                }
            }

            BuildBundleConfig ret = null;
            if (createIfNotExists)
            {
                if (bundleConfigs == null)
                {
                    bundleConfigs = new List<BuildBundleConfig>();
                }

                ret = new BuildBundleConfig
                {
                    bundleName = bundleName,
                    curType = bundleType,
                    needBuild = true
                };
            }

            return ret;
        }
        
        private void ReCollectBundleByType(List<BuildBundleConfig> newConfigs, List<string> bundleSources, MetacityBundleType curType)
        {
            foreach (var sceneName in bundleSources)
            {
                var newConfig = TryGetConfig(sceneName, curType);
                if (newConfig == null)
                {
                    newConfig = new BuildBundleConfig
                    {
                        bundleName = sceneName,
                        curType = curType,
                        needBuild = true,
                    };
                }
                
                newConfigs.Add(newConfig);
            }
        }

        public void RefreshBundles(List<string> allScenes, List<string> allPrefabs)
        {
            var newConfigs = new List<BuildBundleConfig>();
            ReCollectBundleByType(newConfigs, allScenes, MetacityBundleType.Scene);
            ReCollectBundleByType(newConfigs, allPrefabs, MetacityBundleType.Prefab);

            bundleConfigs = newConfigs;
        }

        public bool NeedBuildBundle(string bundleName, MetacityBundleType bundleType)
        {
            return TryGetConfig(bundleName, bundleType)?.needBuild ?? true;
        }
        
        public void ToggleNeedBuildArtifact(string bundleName)
        {
            if (bundleConfigs == null)
            {
                bundleConfigs = new List<BuildBundleConfig>();
            }

            var curConfig = TryGetConfig(bundleName, MetacityBundleType.Prefab, true);
            curConfig.needBuild = !curConfig.needBuild;
        }
        public void ToggleSceneBundleConfig(string bundleName)
        {
            if (bundleConfigs == null)
            {
                bundleConfigs = new List<BuildBundleConfig>();
            }

            var curConfig = TryGetConfig(bundleName, MetacityBundleType.Scene, true);
            curConfig.needBuild = !curConfig.needBuild;
            curConfig.playMode=mPlayMode;
        }
        public void SetPlayMode(PlayMode playMode)
        {
            mPlayMode=playMode;
            foreach (var bundle in bundleConfigs)
            {
                if (bundle.curType == MetacityBundleType.Scene)
                {
                    bundle.playMode=playMode;
                }
            }
        }

        public void SetWebUrl(WebUrl weburl)
        {
            mWebUrl= weburl;
        }
        
        public void PrepareSave(List<string> allScenes, List<string> allAssets)
        {
            RefreshBundles(allScenes, allAssets);
        }

        private List<string> GetSkippedBundles(MetacityBundleType curType)
        {
            var bundleNames = new List<string>();
            if (bundleConfigs != null)
            {
                foreach (var bundleConfig in bundleConfigs)
                {
                    if (bundleConfig.curType == curType &&
                        !bundleConfig.needBuild)
                    {
                        bundleNames.Add(bundleConfig.bundleName);
                    }
                }
            }

            return bundleNames;
        }
        
        private List<BuildBundleConfig> GetAllBundles(MetacityBundleType curType)
        {
            var bundles = new List<BuildBundleConfig>();
            if (bundleConfigs != null)
            {
                foreach (var bundleConfig in bundleConfigs)
                {
                    if (bundleConfig.curType == curType)
                    {
                        bundles.Add(bundleConfig);
                    }
                }
            }

            return bundles;
        }
        
        public List<string> skipAssets => GetSkippedBundles(MetacityBundleType.Prefab);
        
        public List<BuildBundleConfig> allSceneBundles => GetAllBundles(MetacityBundleType.Scene);
        
        public List<BuildBundleConfig> allAssetBundles => GetAllBundles(MetacityBundleType.Prefab);
    }

    public static class BuildEntry
    {
        private static readonly List<MetacityBundle> AllBundleBuilds = new List<MetacityBundle>();
        
        private static void PrepareBuild()
        {
            AllBundleBuilds.Clear();

            var buildPath = Constants.BundleFolderPath;
            if (Directory.Exists(buildPath))
            {
                DirectoryInfo di = new DirectoryInfo(buildPath);
                foreach (FileInfo file in di.GetFiles())
                {
                    file.Delete(); 
                }
                foreach (DirectoryInfo dir in di.GetDirectories())
                {
                    dir.Delete(true); 
                }
                
                Directory.Delete(buildPath);
            }
            
            Directory.CreateDirectory(buildPath);
        }
        
        /**
         * Build all user generated contents into Bundles according to the following rules:
         * (1) Each scene inside the Assets/Game folder will be packed into one scene bundle named as its scene name in lower cases
         * 
         * (2) User should put all the sharable assets (e.g., a prefab that can be bought and used by other users) into the Assets/Exports folder.
         *     Specifically, a specific prefab and all its dependent assets should be put into one child folder in Assets/Exports. Then they will be
         *     packed into one asset bundle named as the folder name in lower cases
         * 
         * (3) All the referenced assets (e.g., a prefab from a bundle that shared from other users) are automatically downloaded into the Assets/Imports folder and
         *     user should not modify this folder manually at all if they want to remain the reference link. These assets won't be uploaded to the
         *     cloud as dependent bundles of the user scene. On the contrary, the user scene will dependent on the shared bundle directly instead.
         * 
         * (4) Bundle dependencies will be correctly processed in the pack progress and stored on the cloud. So user doesn't need to handle it by themselves
         * 
         * (5) Bundle hashes will be considered automatically when uploading the bundle and updating its content on the cloud. If it doesn't change after
         *     a new build, nothing will be changed on the cloud.
         * 
         * (6) By default, user can use the builtin pack process which will generate bundles following the above rules. However, they can also customize
         *     it by turning on "Customize Build" and toggling off check boxes before bundles to build in the BundleMainWindow. Bundles with unchecked boxes will
         *     skip the next build and won't be uploaded to the cloud at all
         * 
         */
        public static List<BuildCatalog> DoBuild(PlayMode playMode,List<BuildBundleConfig> sceneConfigs, List<string> skipPrefabs)
        {
            PrepareBuild();
            SpawnPositionCollector.CollectSpawnPositionBundle(AllBundleBuilds);
            PrefabCollector.CollectPrefabBundles(AllBundleBuilds, skipPrefabs);
            SceneCollector.CollectSceneBundles(AllBundleBuilds, sceneConfigs);
            
            var platform = EditorUserBuildSettings.activeBuildTarget;
            AssetBundleManifest manifest = null;
            try
            {
                var allBundleBuilds = AllBundleBuilds.Select(item => item.BundleBuild);
                manifest = BuildPipeline.BuildAssetBundles(Constants.BundleFolderPath, allBundleBuilds.ToArray(), BuildAssetBundleOptions.None, platform);
                Debug.Log($"Build succeeded. Manifest {manifest.name}");
            }
            catch (Exception e)
            {
                Debug.LogError($"Build bundle error for {platform.ToString()}: {e.Message}");
            }

            if (manifest != null)
            {
                var catalogs = CatalogUtilities.CreateCatalog(playMode,platform, manifest, AllBundleBuilds);

                var catalogCollection = new BuildCatalogCollection
                {
                    catalogs = catalogs.ToArray()
                };

                var writer = new StreamWriter(Constants.BundleLocalCatalogPath, false);
                writer.WriteLine(JsonUtility.ToJson(catalogCollection));
                writer.Close();

                return catalogs;
            }

            Debug.LogError($"nothing is built");
            return null;
        }

        public static List<BuildCatalog> LoadLastBuiltCatalog()
        {
            var catalogReader = new StreamReader(Constants.BundleLocalCatalogPath);
            try
            {
                var catalogCollection = JsonUtility.FromJson<BuildCatalogCollection>(catalogReader.ReadToEnd());
                return catalogCollection.catalogs.ToList();
            }
            catch (System.Exception)
            {
                Debug.Log($"Cannot load last build catalog from {Constants.BundleLocalCatalogPath}!");
            }

            return new List<BuildCatalog>();
        }
    }
}