using System;
using UnityEngine;
using UnityEditor;
using UnityEngine.Assertions;
using System.Collections.Generic;
using System.Linq;
using UnityEditor.IMGUI.Controls;

namespace AssetBundleBrowser.AssetBundleDataSource
{
    internal class AssetDatabaseABDataSource : ABDataSource
    {
        public static List<ABDataSource> CreateDataSources()
        {
            AssetDatabaseABDataSource op = new AssetDatabaseABDataSource();
            List<ABDataSource> retList = new List<ABDataSource>();
            retList.Add(op);
            return retList;
        }

        public string Name
        {
            get { return "Default"; }
        }

        public string ProviderName
        {
            get { return "Built-in"; }
        }

        public string[] GetAssetPathsFromAssetBundle(string assetBundleName)
        {
            return AssetDatabase.GetAssetPathsFromAssetBundle(assetBundleName);
        }

        public string GetAssetBundleName(string assetPath)
        {
            AssetImporter importer = AssetImporter.GetAtPath(assetPath);
            if (importer == null) return string.Empty;
            string bundleName = importer.assetBundleName;
            if (importer.assetBundleVariant.Length > 0) bundleName = bundleName + "." + importer.assetBundleVariant;
            return bundleName;
        }

        public string GetImplicitAssetBundleName(string assetPath)
        {
            return AssetDatabase.GetImplicitAssetBundleName(assetPath);
        }

        public string[] GetAllAssetBundleNames()
        {
            return AssetDatabase.GetAllAssetBundleNames();
        }

        public bool IsReadOnly()
        {
            return false;
        }

        public void SetAssetBundleNameAndVariant(string assetPath, string bundleName, string variantName)
        {
            AssetImporter.GetAtPath(assetPath).SetAssetBundleNameAndVariant(bundleName, variantName);
        }

        public void RemoveUnusedAssetBundleNames()
        {
            AssetDatabase.RemoveUnusedAssetBundleNames();
        }

        public bool CanSpecifyBuildTarget
        {
            get { return true; }
        }

        public bool CanSpecifyBuildOutputDirectory
        {
            get { return true; }
        }

        public bool CanSpecifyBuildOptions
        {
            get { return true; }
        }

        public bool BuildAssetBundles(ABBuildInfo info)
        {
            if (info == null)
            {
                Debug.Log("Error in build");
                return false;
            }

            AssetBundleManifest buildManifest = BuildPipeline.BuildAssetBundles(info.outputDirectory, info.options, info.buildTarget);
            if (buildManifest == null)
            {
                Debug.Log("Error in build");
                return false;
            }

            foreach (string assetBundleName in buildManifest.GetAllAssetBundles())
                if (info.onBuild != null)
                    info.onBuild(assetBundleName);
            return true;
        }
    }
}