using System.Collections.Generic;
using System.IO;
using PhxhSDK;
using UnityEngine;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine.Rendering;
using Object = UnityEngine.Object;

/// <summary>
/// 地面处理工具类
/// </summary>
public static class GroundUtils
{
    /// <summary>
    /// 修改地面贴图及材质的路径 用于打包
    /// </summary>
    public static void ChangeMapTextureAndMatPath(GameObject ground, string targetDir, string prefix, 
        List<string> groundRootNames, Transform rootTransform, Transform unpackedRoot)
    {
        if (ground == null)
        {
            Debug.LogError("找不到地面对象，无法修改地面贴图和材质路径");
            return;
        }

        // 获取地面的渲染器
        var renderer = ground.GetComponent<MeshRenderer>();
        if (renderer == null || renderer.sharedMaterial == null)
        {
            Debug.LogError("地面对象缺少渲染器或材质");
            return;
        }

        // 确保目标目录存在
        EnsureDirectoryExists(targetDir);

        // 处理材质和贴图
        Dictionary<Material, Material> matMapping = new Dictionary<Material, Material>();
        Dictionary<Texture, Texture> texMapping = new Dictionary<Texture, Texture>();

        // 处理主地面材质
        MaterialUtils.ProcessMaterialAndTexture(renderer.sharedMaterial, targetDir, prefix, matMapping, texMapping);

        // 处理groundRoot下的所有材质
        foreach (var rootName in groundRootNames)
        {
            var rootObj = rootTransform.FindChildRecursive(rootName);
            if (rootObj != null)
            {
                var renderers = rootObj.GetComponentsInChildren<Renderer>(true);
                foreach (var r in renderers)
                {
                    foreach (var mat in r.sharedMaterials)
                    {
                        if (mat != null)
                        {
                            MaterialUtils.ProcessMaterialAndTexture(mat, targetDir, prefix, matMapping, texMapping);
                        }
                    }
                }
            }
        }

        // 更新场景中地面对象的材质引用
        MaterialUtils.UpdateGroundMaterialReferences(ground, matMapping);

        // 检查其他地面节点
        foreach (var rootName in groundRootNames)
        {
            var rootObj = rootTransform.FindChildRecursive(rootName);
            if (rootObj != null)
            {
                var renderers = rootObj.GetComponentsInChildren<Renderer>(true);
                foreach (var r in renderers)
                {
                    MaterialUtils.UpdateRendererMaterialReferences(r, matMapping);
                }
            }
        }

        // 解除预制体对原始贴图的引用
        if (unpackedRoot != null)
        {
            // 如果Art节点是从预制体解包的，确保彻底断开所有引用
            MaterialUtils.EnsureNoOriginalReferences(unpackedRoot.gameObject);
        }

        // 在整个场景中查找任何可能仍然引用原始材质或贴图的渲染器
        MaterialUtils.FindAndReplaceAllMaterialReferences(matMapping);

        // 脏标记整个场景，确保所有改动都被保存
        EditorSceneManager.MarkSceneDirty(ground.scene);

        // 保存所有更改
        AssetDatabase.SaveAssets();
        AssetDatabase.Refresh();

        Debug.Log("地面贴图和材质路径修改完成");
    }

    /// <summary>
    /// 确保目录存在
    /// </summary>
    private static void EnsureDirectoryExists(string dirPath)
    {
        if (!AssetDatabase.IsValidFolder(dirPath))
        {
            string parentDir = Path.GetDirectoryName(dirPath);
            if (!AssetDatabase.IsValidFolder(parentDir))
            {
                AssetDatabase.CreateFolder(Path.GetDirectoryName(parentDir), Path.GetFileName(parentDir));
            }

            AssetDatabase.CreateFolder(parentDir, Path.GetFileName(dirPath));
            AssetDatabase.Refresh();
        }
    }

    /// <summary>
    /// 切割地面贴图
    /// </summary>
    public static void SplitGroundTexture(GameObject ground, string groundSplitDir, string prefix, int splitWidth, int splitHeight)
    {
        if (ground == null)
            return;
        var renderer = ground.GetComponent<MeshRenderer>();
        if (renderer == null)
            return;
        var mat = renderer.sharedMaterial;
        if (mat == null)
            return;
        var texture = mat.mainTexture as Texture2D;
        if (texture == null)
            return;

        var groundParent = Object.Instantiate(ground, ground.transform.parent, true);
        groundParent.name = "Ground";

        // 计算原始地面的大小
        var originalScale = ground.transform.localScale;
        var originalWidth = originalScale.x;
        var originalHeight = originalScale.y;

        var originPos = -new Vector3(originalWidth / 2f, originalHeight / 2f, 0);
        groundParent.transform.localScale = Vector3.one;

        // 确保目录存在
        EnsureDirectoryExists(groundSplitDir);

        var textures = SplitTextureUtil.SplitTexture(texture, splitWidth, splitHeight, groundSplitDir, prefix);

        // 计算每个分割块的大小（基于原始地面大小）
        var rowCount = textures.GetLength(0);
        var columnCount = textures.GetLength(1);
        var blockWidth = originalWidth / columnCount;
        var blockHeight = originalHeight / rowCount;

        for (int row = 0; row < rowCount; row++)
        {
            for (int column = 0; column < columnCount; column++)
            {
                var splitTexture = textures[row, column];
                if (splitTexture == null)
                {
                    Debug.LogError($"Failed to load split texture at row {row}, column {column}");
                    continue;
                }

                var splitGround = Object.Instantiate(ground, groundParent.transform, true);
                Object.DestroyImmediate(splitGround.GetComponent<Collider>());
                var splitName = $"{prefix}Ground_{row}_{column}";
                splitGround.name = splitName;

                // 设置固定的quad大小，不随贴图尺寸变化
                splitGround.transform.localScale = new Vector3(blockWidth, blockHeight, 1);

                // 创建并保存材质
                var splitMat = Object.Instantiate(mat);
                splitMat.mainTexture = splitTexture;
                var matPath = $"{groundSplitDir}/{splitName}.mat";
                AssetDatabase.CreateAsset(splitMat, matPath);
                AssetDatabase.SaveAssets();
                AssetDatabase.Refresh();

                // 重新加载保存后的材质
                var savedMat = AssetDatabase.LoadAssetAtPath<Material>(matPath);
                if (savedMat == null)
                {
                    Debug.LogError($"Failed to load saved material at {matPath}");
                    continue;
                }

                var meshRenderer = splitGround.GetComponent<MeshRenderer>();
                if (meshRenderer != null)
                {
                    meshRenderer.sharedMaterial = savedMat;
                    meshRenderer.shadowCastingMode = ShadowCastingMode.Off;
                }

                // 计算位置，使用固定的block大小
                splitGround.transform.localPosition =
                    originPos + new Vector3(column * blockWidth + blockWidth / 2f, row * blockHeight + blockHeight / 2f,
                        0);
            }
        }

        Object.DestroyImmediate(ground);
        Object.DestroyImmediate(groundParent.GetComponent<Renderer>());
        Object.DestroyImmediate(groundParent.GetComponent<Collider>());
        var boxCollider = groundParent.gameObject.AddComponent<BoxCollider>();
        boxCollider.size = new Vector3(200, 200, 1);
        boxCollider.center = new Vector3(0, 0, 0.5f);
        Object.DestroyImmediate(groundParent.GetComponent<MeshFilter>());
    }
}