using System.Collections.Generic;
using System.Linq;
using TMPro;
using UnityEditor;
using UnityEngine;
using UnityEngine.TextCore;

namespace BrewMonster.Scripts.Editor
{
    /// <summary>
    /// Bulk chỉnh BX/BY/AD/Scale trên TMP_SpriteAsset (spriteGlyphTable).
    /// Bulk-edit BX/BY/AD/Scale on TMP_SpriteAsset (spriteGlyphTable).
    /// </summary>
    public sealed class TmpSpriteAssetGlyphMetricsBulkWindow : EditorWindow
    {
        private enum ValueMode
        {
            Absolute,
            AddDelta
        }

        private readonly List<TMP_SpriteAsset> _targets = new List<TMP_SpriteAsset>();
        private Vector2 _scroll;
        private string _nameContains = "";

        private ValueMode _mode = ValueMode.Absolute;

        private bool _setBx = true;
        private bool _setBy = true;
        private bool _setAd = true;
        private bool _setScale;

        private float _bx;
        private float _by = 10f;
        private float _ad = 32f;
        private float _scale = 1f;

        [MenuItem("Tools/Perfect World/ChatSystem/TMP Sprite Metrics (BX/BY/AD)…")]
        public static void Open()
        {
            var w = GetWindow<TmpSpriteAssetGlyphMetricsBulkWindow>(false, "TMP Sprite Metrics", true);
            w.minSize = new Vector2(420f, 360f);
        }

        private void OnGUI()
        {
            EditorGUILayout.Space(4f);
            EditorGUILayout.LabelField("TMP_SpriteAsset — BX / BY / AD / Scale", EditorStyles.boldLabel);
            EditorGUILayout.HelpBox(
                "Áp dụng lên bảng glyph (spriteGlyphTable). Lọc theo tên sprite (cột Name) nếu cần.\n" +
                "Applies to spriteGlyphTable. Optional name filter uses sprite character names.",
                MessageType.None);

            EditorGUILayout.Space(6f);
            DrawTargetsSection();

            EditorGUILayout.Space(8f);
            _nameContains = EditorGUILayout.TextField("Name contains (optional)", _nameContains);

            _mode = (ValueMode)EditorGUILayout.EnumPopup("Mode", _mode);

            EditorGUILayout.Space(4f);
            EditorGUILayout.LabelField("Fields to write", EditorStyles.boldLabel);
            EditorGUILayout.BeginHorizontal();
            _setBx = GUILayout.Toggle(_setBx, "BX", GUILayout.Width(44));
            _setBy = GUILayout.Toggle(_setBy, "BY", GUILayout.Width(44));
            _setAd = GUILayout.Toggle(_setAd, "AD", GUILayout.Width(44));
            _setScale = GUILayout.Toggle(_setScale, "Scale", GUILayout.Width(60));
            EditorGUILayout.EndHorizontal();

            string hint = _mode == ValueMode.Absolute
                ? "Giá trị gán thẳng vào metrics / Set metrics to these values."
                : "Cộng dồn lên giá trị hiện tại / Add to current values.";
            EditorGUILayout.HelpBox(hint, MessageType.None);

            using (new EditorGUI.DisabledScope(!_setBx))
                _bx = EditorGUILayout.FloatField("BX (bearing X)", _bx);
            using (new EditorGUI.DisabledScope(!_setBy))
                _by = EditorGUILayout.FloatField("BY (bearing Y)", _by);
            using (new EditorGUI.DisabledScope(!_setAd))
                _ad = EditorGUILayout.FloatField("AD (advance)", _ad);
            using (new EditorGUI.DisabledScope(!_setScale))
                _scale = EditorGUILayout.FloatField("Scale", _scale);

            EditorGUILayout.Space(10f);
            using (new EditorGUI.DisabledScope(_targets.Count == 0 || (!_setBx && !_setBy && !_setAd && !_setScale)))
            {
                if (GUILayout.Button("Apply to assets", GUILayout.Height(32)))
                    ApplyAll();
            }

            EditorGUILayout.Space(6f);
            DrawSummary();
        }

        private void DrawTargetsSection()
        {
            EditorGUILayout.LabelField("Sprite assets", EditorStyles.boldLabel);

            EditorGUILayout.BeginHorizontal();
            if (GUILayout.Button("Use selection (Project)", GUILayout.Height(22)))
                AddFromSelection();
            if (GUILayout.Button("Clear list", GUILayout.Width(100)))
                _targets.Clear();
            EditorGUILayout.EndHorizontal();

            _scroll = EditorGUILayout.BeginScrollView(_scroll, GUILayout.MinHeight(120f));
            for (int i = 0; i < _targets.Count; i++)
            {
                EditorGUILayout.BeginHorizontal();
                _targets[i] = (TMP_SpriteAsset)EditorGUILayout.ObjectField(
                    _targets[i], typeof(TMP_SpriteAsset), false);
                if (GUILayout.Button("−", GUILayout.Width(24)))
                {
                    _targets.RemoveAt(i);
                    i--;
                }

                EditorGUILayout.EndHorizontal();
            }

            EditorGUILayout.EndScrollView();

            var drop = (TMP_SpriteAsset)EditorGUILayout.ObjectField(
                "Drag asset here to add", null, typeof(TMP_SpriteAsset), false);
            if (drop != null && !_targets.Contains(drop))
                _targets.Add(drop);
        }

        private void AddFromSelection()
        {
            foreach (Object o in Selection.objects)
            {
                if (o is TMP_SpriteAsset sa && !_targets.Contains(sa))
                    _targets.Add(sa);
            }
        }

        private void DrawSummary()
        {
            int n = _targets.Count;
            if (n == 0)
            {
                EditorGUILayout.LabelField("No assets in list.");
                return;
            }

            int glyphs = _targets.Where(t => t != null).Sum(t => t.spriteGlyphTable?.Count ?? 0);
            EditorGUILayout.LabelField($"Assets: {n}  |  Total glyphs: {glyphs}");
        }

        private void ApplyAll()
        {
            if (!_setBx && !_setBy && !_setAd && !_setScale)
            {
                EditorUtility.DisplayDialog("TMP Sprite Metrics", "Chọn ít nhất một field (BX/BY/AD/Scale).", "OK");
                return;
            }

            int changedAssets = 0;
            int changedGlyphs = 0;

            foreach (TMP_SpriteAsset asset in _targets.Where(a => a != null))
            {
                string path = AssetDatabase.GetAssetPath(asset);
                if (string.IsNullOrEmpty(path))
                    continue;

                Undo.RegisterCompleteObjectUndo(asset, "TMP Sprite glyph metrics");

                var glyphTable = asset.spriteGlyphTable;
                if (glyphTable == null || glyphTable.Count == 0)
                    continue;

                HashSet<uint> allowed = BuildGlyphIndexFilter(asset);
                bool touched = false;

                foreach (TMP_SpriteGlyph g in glyphTable)
                {
                    if (g == null)
                        continue;
                    if (allowed != null && !allowed.Contains(g.index))
                        continue;

                    GlyphMetrics m = g.metrics;

                    if (_setBx)
                        m.horizontalBearingX = _mode == ValueMode.Absolute ? _bx : m.horizontalBearingX + _bx;
                    if (_setBy)
                        m.horizontalBearingY = _mode == ValueMode.Absolute ? _by : m.horizontalBearingY + _by;
                    if (_setAd)
                        m.horizontalAdvance = _mode == ValueMode.Absolute ? _ad : m.horizontalAdvance + _ad;

                    g.metrics = m;

                    if (_setScale)
                        g.scale = _mode == ValueMode.Absolute ? _scale : g.scale + _scale;

                    touched = true;
                    changedGlyphs++;
                }

                if (_setScale)
                {
                    var chars = asset.spriteCharacterTable;
                    if (chars != null)
                    {
                        foreach (TMP_SpriteCharacter c in chars)
                        {
                            if (c == null)
                                continue;
                            if (allowed != null && !allowed.Contains(c.glyphIndex))
                                continue;
                            c.scale = _mode == ValueMode.Absolute ? _scale : c.scale + _scale;
                        }
                    }
                }

                if (touched)
                {
                    asset.UpdateLookupTables();
                    EditorUtility.SetDirty(asset);
                    changedAssets++;
                }
            }

            AssetDatabase.SaveAssets();
            Debug.Log($"[Cuong] TMP Sprite Metrics: updated {changedGlyphs} glyph(s) across {changedAssets} asset(s).");
        }

        /// <summary>
        /// null = không lọc / no filter
        /// </summary>
        private HashSet<uint> BuildGlyphIndexFilter(TMP_SpriteAsset asset)
        {
            string f = _nameContains?.Trim();
            if (string.IsNullOrEmpty(f))
                return null;

            var set = new HashSet<uint>();
            var chars = asset.spriteCharacterTable;
            if (chars == null)
                return set;

            foreach (TMP_SpriteCharacter c in chars)
            {
                if (c == null || string.IsNullOrEmpty(c.name))
                    continue;
                if (c.name.IndexOf(f, System.StringComparison.OrdinalIgnoreCase) < 0)
                    continue;
                set.Add(c.glyphIndex);
            }

            return set;
        }
    }
}