namespace AtlasUtility
{
    using UnityEditor;
    using UnityEngine;

    using System;
    using System.Collections;
    using System.Collections.Generic;

    public class AssetBundleManager
    {
        public static void SwitchAssetBundle(string editorPath, string mobilePath, string desktopPath, Platform toPlatform)
        {
            AssetImporter mobileImporter = AssetImporter.GetAtPath(mobilePath);
            AssetImporter desktopImporter = AssetImporter.GetAtPath(desktopPath);
            AssetImporter editorImporter = AssetImporter.GetAtPath(editorPath);

            if (toPlatform == Platform.Editor)
            {
                if (editorImporter == null)
                {
                    Debug.Log("没有编辑器版本");

                    return;
                }
            }
            else if (toPlatform == Platform.Mobile)
            {
                if (mobileImporter == null)
                {
                    Debug.Log("没有移动版本");

                    return;
                }
            }
            else if (toPlatform == Platform.Desktop)
            {
                if (desktopImporter == null)
                {
                    Debug.LogWarning("没有桌面版本");

                    return;
                }
            }
            else
            {
                throw new Exception();
            }

            List<string> pathes = new List<string>();
            List<string> bundleNames = new List<string>();
            List<string> bundleVariants = new List<string>();

            if (mobileImporter != null)
            {
                if (mobileImporter.assetBundleName != "" || mobileImporter.assetBundleVariant != "")
                {
                    pathes.Add(mobileImporter.assetPath);
                }
            }

            if (desktopImporter != null)
            {
                if (desktopImporter.assetBundleName != "" || desktopImporter.assetBundleVariant != "")
                {
                    pathes.Add(desktopImporter.assetPath);
                }
            }

            if (editorImporter != null)
            {
                if (editorImporter.assetBundleName != "" || editorImporter.assetBundleVariant != "")
                {
                    pathes.Add(editorImporter.assetPath);
                }
            }

            if (pathes.Count == 0)
            {
                return;
            }

            if (!IsSameAssetBundle(pathes, bundleNames, bundleVariants))
            {
                Debug.LogWarning($"{editorPath} 的不同版本有不同的AssetBundle");

                return;
            }

            if (editorImporter != null)
            {
                editorImporter.SetAssetBundleNameAndVariant("", "");
                editorImporter.SaveAndReimport();
            }

            if (mobileImporter != null)
            {
                mobileImporter.SetAssetBundleNameAndVariant("", "");
                mobileImporter.SaveAndReimport();
            }

            if (desktopImporter != null)
            {
                desktopImporter.SetAssetBundleNameAndVariant("", "");
                desktopImporter.SaveAndReimport();
            }

            if (toPlatform == Platform.Editor)
            {
                editorImporter.assetBundleName = bundleNames[0];
                editorImporter.assetBundleVariant = bundleVariants[0];
                editorImporter.SaveAndReimport();
            }
            else if (toPlatform == Platform.Mobile)
            {
                mobileImporter.assetBundleName = bundleNames[0];
                mobileImporter.assetBundleVariant = bundleVariants[0];
                mobileImporter.SaveAndReimport();
            }
            else if (toPlatform == Platform.Desktop)
            {
                desktopImporter.assetBundleName = bundleNames[0];
                desktopImporter.assetBundleVariant = bundleVariants[0];
                desktopImporter.SaveAndReimport();
            }
            else
            {
                throw new Exception();
            }
        }

        public static bool IsSameAssetBundle(List<string> pathes, List<string> bundleNames, List<string> bundleVariants)
        {
            for (int i = 0; i < pathes.Count; i++)
            {
                if (bundleNames.Count > 0 && !bundleNames.Contains(AssetImporter.GetAtPath(pathes[i]).assetBundleName))
                {
                    return false;
                }
                else
                {
                    bundleNames.Add(AssetImporter.GetAtPath(pathes[i]).assetBundleName);
                }

                if (bundleVariants.Count > 0 && !bundleVariants.Contains(AssetImporter.GetAtPath(pathes[i]).assetBundleVariant))
                {
                    return false;
                }
                else
                {
                    bundleVariants.Add(AssetImporter.GetAtPath(pathes[i]).assetBundleVariant);
                }
            }

            return true;
        }
    }
}