using UnityEditor;
using UnityEditor.U2D;
using UnityEngine;

/// <summary>
/// 批量设置贴图和图集的平台压缩格式：
///   - PC(Standalone)：不设置覆盖，保持默认
///   - Android：ETC2（有Alpha→RGBA8 / 无Alpha→RGB4）
///   - iPhone：ASTC_6x6
///   - WebGL：ASTC_6x6
/// 
/// 图集只设置 SpriteAtlas 自身格式，不触碰其中的 Sprite。
/// 
/// 菜单：程序/Sprite/批量设置贴图平台格式
/// </summary>
public class BatchTexturePlatformSettings
{
    private static readonly string TARGET_FOLDER = TexturePlatformFormatHelper.TARGET_FOLDER;

    [MenuItem("程序/Sprite/批量设置贴图平台格式(全部)")]
    public static void SetAll()
    {
        SetTextures();
        SetSpriteAtlases();
        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();
    }

    [MenuItem("程序/Sprite/批量设置贴图平台格式(仅贴图)")]
    public static void SetTexturesOnly()
    {
        SetTextures();
        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();
    }

    [MenuItem("程序/Sprite/批量设置贴图平台格式(仅图集)")]
    public static void SetAtlasesOnly()
    {
        SetSpriteAtlases();
        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();
    }

    // ============================================================
    // 贴图
    // ============================================================
    static void SetTextures()
    {
        var guids = AssetDatabase.FindAssets("t:Texture2D", new[] { TARGET_FOLDER });
        int total = guids.Length;
        int converted = 0;
        int skipped = 0;

        for (int i = 0; i < total; i++)
        {
            var assetPath = AssetDatabase.GUIDToAssetPath(guids[i]);
            EditorUtility.DisplayProgressBar("批量设置贴图平台格式", $"[{i + 1}/{total}] {assetPath}", (float)i / total);

            var importer = AssetImporter.GetAtPath(assetPath) as TextureImporter;
            if (importer == null) { skipped++; continue; }

            if (TexturePlatformFormatHelper.ApplyTexturePlatformSettings(importer))
            {
                importer.SaveAndReimport();
                converted++;
                Debug.Log($"[BatchTex] 贴图: {assetPath}");
            }
            else
            {
                skipped++;
            }
        }

        EditorUtility.ClearProgressBar();
        Debug.Log($"[BatchTex] 贴图完成：转换 {converted}，跳过 {skipped}，共 {total}");
        EditorUtility.DisplayDialog("贴图格式设置完成",
            $"转换 {converted} 个，跳过 {skipped} 个，共 {total} 个贴图。\nAndroid → ETC2\niPhone → ASTC_6x6\nWebGL → ASTC_6x6\nPC → 默认",
            "OK");
    }

    // ============================================================
    // 图集
    // ============================================================
    static void SetSpriteAtlases()
    {
        var guids = AssetDatabase.FindAssets("t:SpriteAtlas", new[] { TARGET_FOLDER });
        int total = guids.Length;
        int converted = 0;
        int skipped = 0;

        for (int i = 0; i < total; i++)
        {
            var assetPath = AssetDatabase.GUIDToAssetPath(guids[i]);
            EditorUtility.DisplayProgressBar("批量设置图集平台格式", $"[{i + 1}/{total}] {assetPath}", (float)i / total);

            try
            {
                var importer = SpriteAtlasImporter.GetAtPath(assetPath) as SpriteAtlasImporter;
                if (importer == null) { skipped++; continue; }

                if (TexturePlatformFormatHelper.ApplyAtlasPlatformSettings(importer))
                {
                    importer.SaveAndReimport();
                    converted++;
                    Debug.Log($"[BatchTex] 图集: {assetPath}");
                }
                else
                {
                    skipped++;
                }
            }
            catch (System.Exception ex)
            {
                Debug.LogError($"[BatchTex] 图集失败 {assetPath}: {ex.Message}");
            }
        }

        EditorUtility.ClearProgressBar();
        Debug.Log($"[BatchTex] 图集完成：转换 {converted}，跳过 {skipped}，共 {total}");
        EditorUtility.DisplayDialog("图集格式设置完成",
            $"转换 {converted} 个，跳过 {skipped} 个，共 {total} 个图集。\nAndroid → ETC2_RGBA8\niPhone → ASTC_6x6\nWebGL → ASTC_6x6\nPC → 默认",
            "OK");
    }
}