/*
 * MonsterOrientationCheck
 *
 * 一键检测 Assets/_External/Monsters 和 Assets/_External/Bosses 下所有怪物 FBX 的朝向。
 * 判定逻辑:实例化 FBX 到隐藏临时场景,读 SkinnedMeshRenderer.bounds:
 *   - height = bounds.size.y  (Unity 站立高度)
 *   - depth  = bounds.size.z
 *   - width  = bounds.size.x
 *   如果 height > max(depth, width) * 1.2 → 站立 OK
 *   否则需要 X=-90 (从 Z-up 转 Y-up) 或 X=90
 *
 * 输出表格到 Console + 写 Assets/_External/_OrientationReport.txt。
 */

using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using UnityEditor;
using UnityEngine;

namespace OctoberStudio.EditorTools
{
    public static class MonsterOrientationCheck
    {
        private const string MonstersDir = "Assets/Res/Role/Monster";
        private const string BossesDir = "Assets/Res/Role/Boss"; // 可选,有就扫
        private const string ReportPath = "Assets/_OrientationReport.txt";

        [MenuItem("Tools/OctoberStudio/VAT/Check Monster Orientation", priority = 50)]
        public static void Run()
        {
            var sb = new StringBuilder();
            sb.AppendLine("# Monster/Boss FBX 朝向检测报告");
            sb.AppendLine($"# 生成时间: {System.DateTime.Now:yyyy-MM-dd HH:mm:ss}");
            sb.AppendLine("# 判定:height 是 size.y; 若 height 不是最大维度,需要 X 校正");
            sb.AppendLine();
            sb.AppendLine($"{"角色",-30} {"X",8} {"Y",8} {"Z",8} {"主轴",4} {"需要 X 校正?",-15}");
            sb.AppendLine(new string('-', 80));

            var results = new List<Entry>();
            CollectFromDir(MonstersDir, results);
            CollectFromDir(BossesDir, results);

            int needXCorrect = 0;
            foreach (var r in results.OrderBy(e => e.Category).ThenBy(e => e.Name))
            {
                string mainAxis = GetMainAxis(r.Size);
                bool needFix = mainAxis != "Y";
                string fixHint = needFix
                    ? (mainAxis == "Z" ? "X=-90 (Z-up)" : (mainAxis == "X" ? "Y=90 (X-up?)" : "?"))
                    : "OK (Y-up)";

                if (needFix) needXCorrect++;

                sb.AppendLine($"{r.Name,-30} {r.Size.x,8:F2} {r.Size.y,8:F2} {r.Size.z,8:F2} {mainAxis,4} {fixHint,-15}");
            }

            sb.AppendLine();
            sb.AppendLine($"# 总计: {results.Count}, 需要 X 校正: {needXCorrect}, 直接可用: {results.Count - needXCorrect}");

            var text = sb.ToString();
            File.WriteAllText(Path.GetFullPath(ReportPath), text);
            AssetDatabase.ImportAsset(ReportPath);

            Debug.Log(text);
            Debug.Log($"[Orientation Check] 报告已写入: {ReportPath}");
        }

        private static void CollectFromDir(string dir, List<Entry> results)
        {
            if (!AssetDatabase.IsValidFolder(dir)) return;

            // 找每个子目录的主 FBX(不带 @ 的那个)
            var subDirs = AssetDatabase.GetSubFolders(dir);
            foreach (var sub in subDirs)
            {
                var fbxGuids = AssetDatabase.FindAssets("t:Model", new[] { sub });
                foreach (var g in fbxGuids)
                {
                    var path = AssetDatabase.GUIDToAssetPath(g);
                    var fileName = Path.GetFileName(path);
                    // 跳过 @animation / @Run 这种动画 FBX,只测主 FBX
                    if (fileName.Contains("@")) continue;

                    var fbx = AssetDatabase.LoadAssetAtPath<GameObject>(path);
                    if (fbx == null) continue;

                    var bounds = GetCombinedBounds(fbx);
                    if (bounds.HasValue)
                    {
                        results.Add(new Entry
                        {
                            Category = dir,
                            Name = Path.GetFileNameWithoutExtension(path) + "  (" + Path.GetFileName(sub) + ")",
                            Size = bounds.Value.size,
                            Path = path,
                        });
                    }
                }
            }
        }

        private static Bounds? GetCombinedBounds(GameObject fbxAsset)
        {
            // 临时实例化(不入场景),取 SMR.sharedMesh.bounds(这是 local space,反映 FBX 内部朝向)
            // 注意: SkinnedMeshRenderer.bounds 是 world space, 但 sharedMesh.bounds 才是本地(模型空间)
            var smrs = fbxAsset.GetComponentsInChildren<SkinnedMeshRenderer>(true);
            var mfs = fbxAsset.GetComponentsInChildren<MeshFilter>(true);

            bool inited = false;
            Bounds b = new Bounds();

            foreach (var smr in smrs)
            {
                if (smr.sharedMesh == null) continue;
                if (!inited) { b = smr.sharedMesh.bounds; inited = true; }
                else b.Encapsulate(smr.sharedMesh.bounds);
            }
            foreach (var mf in mfs)
            {
                if (mf.sharedMesh == null) continue;
                if (!inited) { b = mf.sharedMesh.bounds; inited = true; }
                else b.Encapsulate(mf.sharedMesh.bounds);
            }

            return inited ? b : (Bounds?)null;
        }

        private static string GetMainAxis(Vector3 size)
        {
            float x = Mathf.Abs(size.x);
            float y = Mathf.Abs(size.y);
            float z = Mathf.Abs(size.z);
            if (y >= x && y >= z) return "Y";
            if (z >= x && z >= y) return "Z";
            return "X";
        }

        private class Entry
        {
            public string Category;
            public string Name;
            public Vector3 Size;
            public string Path;
        }
    }
}