using System.IO;
using System.Threading.Tasks;

using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.AddressableAssets.ResourceLocators;
using UnityEngine.ResourceManagement.AsyncOperations;

#if UNITY_EDITOR
using UnityEditor;
using UnityEditor.AddressableAssets;
#endif

namespace Continentis
{
    /// <summary>
    /// 负责在游戏启动时发现并加载所有Mod的资源目录 (catalog.json)
    /// </summary>
    public static class ModLoader
    {
        public const string ModCatalogVersion = "1.0.0";
        
        public static async Task LoadAllModsAsync()
        {
#if UNITY_EDITOR
            var settings = AddressableAssetSettingsDefaultObject.Settings;
            if (settings == null)
            {
                Debug.LogWarning("[ModLoader] Addressable Asset Settings not found. Skipping mod loading.");
                return;
            }

            // 修正后的索引检查：0 = Use Asset Database, 1 = Use Existing Build
            // 只有在 "Use Existing Build" (Index 1) 模式下才加载外部Mod
            if (settings.ActivePlayModeDataBuilderIndex == 0)
            {
                Debug.Log($"[ModLoader] Play Mode is 'Use Asset Database'. No external mods will be loaded. Skipping.");
                return;
            }

            Debug.Log($"[ModLoader] Play Mode is 'Use Existing Build'. Proceeding to load external mods...");
#endif

            string serverDataPath = Path.Combine(Application.dataPath, "../ServerData");

            // 修正后的平台路径构建方式
            string platformName = GetPlatformName();
            string platformSpecificPath = Path.Combine(serverDataPath, platformName);

            Debug.Log($"[ModLoader] Searching for mods in: {platformSpecificPath}");

            if (!Directory.Exists(platformSpecificPath))
            {
                Debug.LogWarning(
                    $"[ModLoader] Mod directory not found at: {platformSpecificPath}. No mods will be loaded. Did you build Addressables?");
                return;
            }

            string catalogFileName = $"catalog_{ModCatalogVersion}.json";
            string catalogPath = Path.Combine(platformSpecificPath, catalogFileName);

            if (File.Exists(catalogPath))
            {
                Debug.Log($"[ModLoader] Found catalog at: {catalogPath}");

                AsyncOperationHandle<IResourceLocator> handle = Addressables.LoadContentCatalogAsync(catalogPath);
                await handle.Task;

                if (handle.Status == AsyncOperationStatus.Succeeded)
                {
                    
                    Debug.Log($"[ModLoader] Successfully loaded mod catalog.");
                }
                else
                {
                    Debug.LogError($"[ModLoader] Failed to load mod catalog at: {catalogPath}");
                }
            }
            else
            {
                Debug.LogWarning($"[ModLoader] No catalog.json found in the mod directory: {platformSpecificPath}");
            }
        }

        private static string GetPlatformName()
        {
#if UNITY_EDITOR
            // 在Editor中，我们可以直接从构建设置获取准确的平台名称字符串
            return EditorUserBuildSettings.activeBuildTarget.ToString();
#else
        // 在实际发布的游戏中，根据Application.platform来判断
        switch (Application.platform)
        {
            case RuntimePlatform.WindowsPlayer:
            case RuntimePlatform.WindowsServer:
                return "StandaloneWindows64"; // 假设我们主要构建64位
            case RuntimePlatform.OSXPlayer:
            case RuntimePlatform.OSXServer:
                return "StandaloneOSX";
            case RuntimePlatform.LinuxPlayer:
            case RuntimePlatform.LinuxServer:
                return "StandaloneLinux64";
            // ... 在这里添加对其他平台的支持
            default:
                return Application.platform.ToString(); // 作为一个备用选项
        }
#endif
        }
    }
}