using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEditor;
using UnityEngine.SceneManagement;
using UnityEditor.SceneManagement;
using UnityEngine.Rendering;

/// <summary>
/// 灯光烘焙工具类
/// </summary>
public static class LightmapUtils
{
    /// <summary>
    /// 处理参与烘焙的节点
    /// </summary>
    public static void PreProcessBake(List<string> rootNames, Transform rootTransform, bool castShadow, bool needReplaceShader, 
        List<Renderer> allBakeRenderers, List<Renderer> needReplaceRenderers)
    {
        foreach (var rootName in rootNames)
        {
            var rootObj = SceneUtils.FindChildRecursive(rootTransform, rootName);
            if (rootObj != null)
            {
                SceneUtils.SetStaticFlagsRecursive(rootObj.gameObject, StaticEditorFlags.ContributeGI);
                var renderers = rootObj.GetComponentsInChildren<Renderer>(true);
                if (renderers != null && renderers.Length > 0)
                {
                    Debug.Log($"从{rootName}收集到 {renderers.Length} 个渲染器用于烘焙");
                    foreach (var renderer in renderers)
                    {
                        Debug.Log($"处理从{rootName}收集到物体{renderer.gameObject.name}的渲染器");
                        if (renderer.receiveShadows)
                        {
                            renderer.shadowCastingMode = castShadow ? ShadowCastingMode.On : ShadowCastingMode.Off;
                            allBakeRenderers.Add(renderer);
                            if (needReplaceShader)
                                needReplaceRenderers.Add(renderer);
                        }
                    }
                }
                else
                {
                    Debug.Log($"从{rootName}收集不到渲染器");
                }
            }
        }
    }

    /// <summary>
    /// 准备灯光：将实时灯光改为烘焙灯光
    /// </summary>
    public static void PrepareLight(Transform root, List<Light> realTimeLights, List<Light> bakedLights)
    {
        var lights = root.GetComponentsInChildren<Light>();
        foreach (var light in lights)
        {
            light.transform.position = new Vector3(0, 0, 0);
            // 复制灯光对象
            var bakeLightObj = Object.Instantiate(light.gameObject, light.transform.parent);
            var bakeLight = bakeLightObj.GetComponent<Light>();

            // 设置为烘焙模式
            bakeLightObj.name = light.name + "_Bake";
            bakeLight.lightmapBakeType = LightmapBakeType.Baked;

            // 取消实时灯光的static
            GameObjectUtility.SetStaticEditorFlags(light.gameObject, 0);
            // 设置烘焙灯光的static 
            GameObjectUtility.SetStaticEditorFlags(bakeLightObj, StaticEditorFlags.ContributeGI);

            // 添加到列表
            bakedLights.Add(bakeLight);
            realTimeLights.Add(light);
        }

        // 关闭实时灯光
        foreach (var realTimeLight in realTimeLights)
        {
            if (realTimeLight != null)
                realTimeLight.gameObject.SetActive(false);
        }

        // 开启烘焙灯光
        foreach (var bakeLight in bakedLights)
        {
            if (bakeLight != null)
                bakeLight.gameObject.SetActive(true);
        }
    }

    /// <summary>
    /// 恢复实时灯光
    /// </summary>
    public static void RevertLight(List<Light> realTimeLights, List<Light> bakedLights)
    {
        // 开启实时灯光
        foreach (var realTimeLight in realTimeLights)
        {
            if (realTimeLight != null)
                realTimeLight.gameObject.SetActive(true);
        }

        Debug.Log($"销毁{bakedLights.Count}个烘焙灯光");
        // 销毁烘焙灯光
        foreach (var bakeLight in bakedLights)
        {
            if (bakeLight != null)
                Object.DestroyImmediate(bakeLight.gameObject);
        }
    }

    /// <summary>
    /// 执行烘焙
    /// </summary>
    public static void Bake(Scene activeScene)
    {
        // 设置烘焙参数并开始烘焙
        var lightingSettings = new LightingSettings();

        Debug.Log($"烘焙时 场景是{activeScene.name}");
        if (Lightmapping.TryGetLightingSettings(out var existingSettings))
        {
            lightingSettings = existingSettings;
        }
        else
        {
            lightingSettings.name = $"{activeScene.name}_LightingSettings";
            AssetDatabase.CreateAsset(lightingSettings, $"Assets/{lightingSettings.name}.asset");
            Lightmapping.lightingSettings = lightingSettings;
        }

        // 设置烘焙参数
        lightingSettings.mixedBakeMode = MixedLightingMode.Subtractive;
        lightingSettings.lightmapper = LightingSettings.Lightmapper.ProgressiveGPU;
        lightingSettings.directSampleCount = 1;
        lightingSettings.indirectSampleCount = 1;
        lightingSettings.environmentSampleCount = 1;
        lightingSettings.lightProbeSampleCountMultiplier = 8;
        lightingSettings.maxBounces = 1;
        lightingSettings.filteringMode = LightingSettings.FilterMode.Auto;
        lightingSettings.lightmapResolution = 40;
        lightingSettings.lightmapPadding = 2;
        lightingSettings.lightmapMaxSize = 1024;
        lightingSettings.lightmapCompression = LightmapCompression.HighQuality;
        lightingSettings.indirectScale = 1;
        lightingSettings.directionalityMode = LightmapsMode.NonDirectional;

        Lightmapping.lightingSettings = lightingSettings;

        // 强制场景保存以确保设置生效
        EditorSceneManager.MarkSceneDirty(activeScene);
        EditorSceneManager.SaveOpenScenes();

        Debug.Log("开始烘焙灯光...");
        Lightmapping.Bake();
        Debug.Log("灯光烘焙完成");
    }

    /// <summary>
    /// 移动光照烘焙相关文件到指定目录
    /// </summary>
    public static void CopyLightmapFiles(Scene scene, string lightmapDirPath)
    {
        string sceneName = scene.name;

        Debug.Log("开始移动光照烘焙文件...");

        try
        {
            // 确保目标目录存在
            string lightmapDirAssetPath = SceneUtils.GetAssetPath(lightmapDirPath);
            if (!AssetDatabase.IsValidFolder(lightmapDirAssetPath))
            {
                // 创建父目录结构
                string[] folders = lightmapDirAssetPath.Split('/');
                string currentPath = folders[0]; // Assets

                for (int i = 1; i < folders.Length; i++)
                {
                    string folderName = folders[i];
                    string parentPath = currentPath;
                    currentPath = $"{currentPath}/{folderName}";

                    if (!AssetDatabase.IsValidFolder(currentPath))
                    {
                        AssetDatabase.CreateFolder(parentPath, folderName);
                    }
                }

                AssetDatabase.Refresh();
            }

            // 1. 移动LightingSettings.asset文件
            string lightingSettingsPath = $"Assets/{sceneName}_LightingSettings.asset";
            if (AssetDatabase.LoadAssetAtPath<UnityEngine.Object>(lightingSettingsPath) != null)
            {
                string destPath = $"{lightmapDirAssetPath}/{sceneName}_LightingSettings.asset";

                // 如果目标已存在，先删除
                if (AssetDatabase.LoadAssetAtPath<UnityEngine.Object>(destPath) != null)
                {
                    AssetDatabase.DeleteAsset(destPath);
                }

                AssetDatabase.MoveAsset(lightingSettingsPath, destPath);
                Debug.Log($"已移动: {lightingSettingsPath} -> {destPath}");
            }

            // 2. 移动整个光照目录
            string lightmapDirName = sceneName;
            string lightmapSourceDir = $"{Path.GetDirectoryName(scene.path)}/{lightmapDirName}";
            string lightmapSourceDirAssetPath = SceneUtils.GetAssetPath(lightmapSourceDir);

            if (AssetDatabase.IsValidFolder(lightmapSourceDirAssetPath))
            {
                string destLightmapDir = $"{lightmapDirAssetPath}/{lightmapDirName}";

                // 如果目标已存在，先删除
                if (AssetDatabase.IsValidFolder(destLightmapDir))
                {
                    AssetDatabase.DeleteAsset(destLightmapDir);
                    AssetDatabase.Refresh();
                }

                // 直接移动整个目录
                string result = AssetDatabase.MoveAsset(lightmapSourceDirAssetPath, destLightmapDir);

                if (string.IsNullOrEmpty(result))
                {
                    Debug.Log($"已成功移动光照数据目录: {lightmapSourceDirAssetPath} -> {destLightmapDir}");
                }
                else
                {
                    Debug.LogError($"移动光照数据目录失败: {result}");
                }
            }
            else
            {
                Debug.LogWarning($"找不到光照数据目录: {lightmapSourceDirAssetPath}");
            }
        }
        catch (System.Exception e)
        {
            Debug.LogError($"移动光照文件时出错: {e.Message}");
        }

        AssetDatabase.Refresh();
        Debug.Log("光照烘焙文件移动完成");
    }
}