using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using AlicizaX.InputGlyph;
using UnityEditor;
using UnityEngine;
using UnityEngine.U2D;
using TMPro;

[CustomEditor(typeof(InputGlyphDatabase))]
public class InputGlyphDatabaseEditor : Editor
{
    SerializedProperty tablesProp;
    SerializedProperty placeholderSpriteProp;
    InputGlyphDatabase db;

    // 动态标签索引（范围：0 .. tablesCount 为各表，最后一个 index = tablesCount 为 Settings）
    int tabIndex = 0;

    // 添加表时使用的临时 UI 状态
    bool showAddField = false;
    string newTableName = "";

    // 每个表的搜索字符串与分页状态（editor 内存，不序列化）
    List<string> searchStrings = new List<string>();
    List<int> currentPages = new List<int>();

    // 常量
    const int itemsPerPage = 10;

    // 缩小后的预览尺寸
    const int previewSize = 52;

    void OnEnable()
    {
        db = target as InputGlyphDatabase;
        tablesProp = serializedObject.FindProperty("tables");
        placeholderSpriteProp = serializedObject.FindProperty("placeholderSprite");

        if (tablesProp == null)
        {
            Debug.LogError("Could not find serialized property 'tables' on InputGlyphDatabase. Check field name.");
            return;
        }

        // 如果没有默认的 Keyboard/Xbox/PlayStation 三个表则确保创建（便于迁移）
        EnsureDefaultTable("Keyboard");
        EnsureDefaultTable("Xbox");
        EnsureDefaultTable("PlayStation");

        // 初始化 editor 状态列表，长度与 tablesProp 对应
        SyncEditorListsWithTables();
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();
        if (db == null || tablesProp == null) return;

        // 顶部工具栏（与 Save 按钮风格一致），同时放置 Settings 按钮
        EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
        GUILayout.Space(4);

        if (GUILayout.Button("Save Asset", EditorStyles.toolbarButton))
        {
            serializedObject.ApplyModifiedProperties();
            EditorUtility.SetDirty(db);
            AssetDatabase.SaveAssets();
        }

        GUILayout.FlexibleSpace();

        // + 按钮：切换显示新增输入区域
        if (GUILayout.Button(showAddField ? "Cancel +" : "+ Add Table", EditorStyles.toolbarButton, GUILayout.Width(110)))
        {
            showAddField = !showAddField;
            newTableName = "";
        }

        // Settings 按钮也放在这个 toolbar 上（风格保持一致）
        int settingsIndex = tablesProp != null ? tablesProp.arraySize : 0;
        bool settingsSelected = (tabIndex == settingsIndex);
        if (GUILayout.Toggle(settingsSelected, "Settings", EditorStyles.toolbarButton, GUILayout.Width(90)) != settingsSelected)
        {
            // 切换到 settings 页面或从 settings 切回第一个 table（如果取消）
            tabIndex = (tabIndex == settingsIndex) ? 0 : settingsIndex;
        }

        EditorGUILayout.EndHorizontal();

        // 如果正在新增，展示一个横向输入框（下方，同 toolbar 风格）
        if (showAddField)
        {
            EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
            GUILayout.Label("Name:", GUILayout.Width(40));
            newTableName = EditorGUILayout.TextField(newTableName);
            if (GUILayout.Button("Add", EditorStyles.toolbarButton, GUILayout.Width(80)))
            {
                string trimmed = newTableName != null ? newTableName.Trim() : "";
                if (string.IsNullOrEmpty(trimmed))
                {
                    EditorUtility.DisplayDialog("Invalid Name", "Table name cannot be empty.", "OK");
                }
                else
                {
                    // 唯一性检查（不区分大小写）
                    bool exists = false;
                    for (int i = 0; i < tablesProp.arraySize; ++i)
                    {
                        var t = tablesProp.GetArrayElementAtIndex(i);
                        var nameProp = t.FindPropertyRelative("deviceName");
                        if (nameProp != null && string.Equals(nameProp.stringValue, trimmed, StringComparison.OrdinalIgnoreCase))
                        {
                            exists = true; break;
                        }
                    }
                    if (exists)
                    {
                        EditorUtility.DisplayDialog("Duplicate", "A table with that name already exists.", "OK");
                    }
                    else
                    {
                        int newIndex = tablesProp.arraySize;
                        tablesProp.InsertArrayElementAtIndex(newIndex);
                        var newTable = tablesProp.GetArrayElementAtIndex(newIndex);
                        var nameProp = newTable.FindPropertyRelative("deviceName");
                        if (nameProp != null) nameProp.stringValue = trimmed;
                        var tmpAssetProp = newTable.FindPropertyRelative("tmpAsset");
                        if (tmpAssetProp != null) tmpAssetProp.objectReferenceValue = null;
                        var entriesProp = newTable.FindPropertyRelative("entries");
                        if (entriesProp != null) entriesProp.arraySize = 0;

                        serializedObject.ApplyModifiedProperties();
                        EditorUtility.SetDirty(db);

                        // 重新 sync editor lists
                        SyncEditorListsWithTables();

                        showAddField = false;
                        tabIndex = tablesProp.arraySize - 1; // 选择新建的 tab
                    }
                }
            }
            if (GUILayout.Button("Cancel", EditorStyles.toolbarButton, GUILayout.Width(80)))
            {
                showAddField = false;
                newTableName = "";
            }

            EditorGUILayout.EndHorizontal();
        }

        EditorGUILayout.Space(6);

        // 绘制标签行（来自 tables 的 deviceName），但不再包含 Settings（Settings 已在上方 toolbar）
        EditorGUILayout.BeginHorizontal(EditorStyles.toolbar);
        int tablesCount = tablesProp.arraySize;
        for (int i = 0; i < tablesCount; ++i)
        {
            var t = tablesProp.GetArrayElementAtIndex(i);
            var nameProp = t.FindPropertyRelative("deviceName");
            string name = nameProp != null ? nameProp.stringValue : ("Table " + i);
            bool selected = (tabIndex == i);
            // 采用 toolbarButton 风格的 toggle
            if (GUILayout.Toggle(selected, name, EditorStyles.toolbarButton, GUILayout.MinWidth(60)))
            {
                tabIndex = i;
            }

            // 每个表右侧加一个小删除按钮（Settings 不在这里）
            if (GUILayout.Button("×", EditorStyles.toolbarButton, GUILayout.Width(22)))
            {
                // 二次确认
                if (EditorUtility.DisplayDialog("Delete Table?",
                    $"Delete table '{name}' and all its entries? This cannot be undone.", "Delete", "Cancel"))
                {
                    tablesProp.DeleteArrayElementAtIndex(i);
                    serializedObject.ApplyModifiedProperties();
                    EditorUtility.SetDirty(db);

                    // 调整 tabIndex 与 editor 状态
                    SyncEditorListsWithTables();
                    tabIndex = Mathf.Clamp(tabIndex, 0, Math.Max(0, tablesProp.arraySize - 1));
                    return; // 直接返回防止继续绘制已修改的 serializedObject
                }
            }
        }

        EditorGUILayout.EndHorizontal();

        EditorGUILayout.Space(8);

        // 绘制选中页内容（如果是 Settings 或某个 table）
        EditorGUILayout.BeginVertical("box");
        if (tabIndex == tablesProp.arraySize)
        {
            // Settings 页
            EditorGUILayout.LabelField("Settings", EditorStyles.boldLabel);
            EditorGUILayout.Space(4);
            EditorGUILayout.PropertyField(placeholderSpriteProp, new GUIContent("Placeholder Sprite"));
            Sprite placeholder = placeholderSpriteProp.objectReferenceValue as Sprite;
            EditorGUILayout.Space(6);
            EditorGUILayout.LabelField("Preview", EditorStyles.miniBoldLabel);
            if (placeholder != null)
            {
                Texture2D preview = AssetPreview.GetAssetPreview(placeholder);
                if (preview == null) preview = AssetPreview.GetMiniThumbnail(placeholder);
                if (preview != null) GUILayout.Label(preview, GUILayout.Width(previewSize), GUILayout.Height(previewSize));
                else EditorGUILayout.ObjectField(placeholder, typeof(Sprite), false, GUILayout.Width(previewSize), GUILayout.Height(previewSize));
            }
            else
            {
                EditorGUILayout.HelpBox("No placeholder sprite assigned. If FindEntryByControlPath receives an empty path, it will return null.", MessageType.Info);
            }
        }
        else
        {
            // Table 页
            if (tabIndex < 0 || tabIndex >= tablesProp.arraySize)
            {
                EditorGUILayout.HelpBox("Invalid table index.", MessageType.Error);
            }
            else
            {
                var tableProp = tablesProp.GetArrayElementAtIndex(tabIndex);
                // 去掉顶部显示 table 名称的 label
                // var nameProp = tableProp.FindPropertyRelative("deviceName");
                // string tableName = nameProp != null ? nameProp.stringValue : $"Table {tabIndex}";
                // EditorGUILayout.LabelField(tableName, EditorStyles.boldLabel);

                // Ensure editor lists 长度一致
                EnsureEditorListsLength();

                // 搜索框：尽量使用 EditorStyles.toolbarSearchField（去掉左侧标题和 clear 按钮）
                GUILayout.BeginHorizontal();
                GUIStyle searchStyle = EditorStyles.toolbarSearchField ?? EditorStyles.textField;
                searchStrings[tabIndex] = GUILayout.TextField(searchStrings[tabIndex] ?? "", searchStyle);
                GUILayout.EndHorizontal();

                EditorGUILayout.Space(6);

                // 将 TMP Sprite Asset 的选择框 与 Parse / Clear 按钮 水平显示
                var tmpAssetProp = tableProp.FindPropertyRelative("tmpAsset");
                EditorGUILayout.BeginHorizontal();
                GUILayout.Label("TMP Sprite Asset", GUILayout.Width(140));
                EditorGUILayout.PropertyField(tmpAssetProp, GUIContent.none, GUILayout.ExpandWidth(true));
                if (GUILayout.Button("Parse TMP Asset", GUILayout.Width(120))) ParseTMPAssetIntoTableSerialized(tableProp);
                if (GUILayout.Button("Clear", GUILayout.Width(80)))
                {
                    var entriesProp = tableProp.FindPropertyRelative("entries");
                    if (entriesProp != null) entriesProp.arraySize = 0;
                    serializedObject.ApplyModifiedProperties();
                    EditorUtility.SetDirty(db);
                    currentPages[tabIndex] = 0;
                }
                EditorGUILayout.EndHorizontal();

                EditorGUILayout.Space(6);

                var entries = tableProp.FindPropertyRelative("entries");
                if (entries != null)
                {
                    int total = entries.arraySize;
                    // collect matched indices by searching sprite.name
                    List<int> matchedIndices = new List<int>();
                    string query = (searchStrings[tabIndex] ?? "").Trim();
                    for (int i = 0; i < total; ++i)
                    {
                        var eProp = entries.GetArrayElementAtIndex(i);
                        if (eProp == null) continue;
                        var spriteProp = eProp.FindPropertyRelative("Sprite");
                        Sprite s = spriteProp.objectReferenceValue as Sprite;
                        string name = s != null ? s.name : "";
                        if (string.IsNullOrEmpty(query) || name.IndexOf(query, StringComparison.OrdinalIgnoreCase) >= 0)
                        {
                            matchedIndices.Add(i);
                        }
                    }

                    int matchedTotal = matchedIndices.Count;
                    int totalPages = Mathf.Max(1, (matchedTotal + itemsPerPage - 1) / itemsPerPage);
                    currentPages[tabIndex] = Mathf.Clamp(currentPages[tabIndex], 0, totalPages - 1);

                    // pagination controls (toolbar 风格)
                    EditorGUILayout.BeginHorizontal();
                    if (GUILayout.Button("<<", EditorStyles.miniButtonLeft, GUILayout.Width(36))) { currentPages[tabIndex] = 0; }
                    if (GUILayout.Button("<", EditorStyles.miniButtonMid, GUILayout.Width(36))) { currentPages[tabIndex] = Mathf.Max(0, currentPages[tabIndex] - 1); }

                    GUILayout.FlexibleSpace();
                    EditorGUILayout.LabelField(string.Format("Page {0}/{1}", currentPages[tabIndex] + 1, totalPages), GUILayout.Width(120));
                    GUILayout.FlexibleSpace();

                    if (GUILayout.Button(">", EditorStyles.miniButtonMid, GUILayout.Width(36))) { currentPages[tabIndex] = Mathf.Min(totalPages - 1, currentPages[tabIndex] + 1); }
                    if (GUILayout.Button(">>", EditorStyles.miniButtonRight, GUILayout.Width(36))) { currentPages[tabIndex] = totalPages - 1; }
                    EditorGUILayout.EndHorizontal();

                    EditorGUILayout.Space(4);

                    int start = currentPages[tabIndex] * itemsPerPage;
                    int end = Math.Min(start + itemsPerPage, matchedTotal);

                    for (int mi = start; mi < end; ++mi)
                    {
                        int i = matchedIndices[mi];
                        var eProp = entries.GetArrayElementAtIndex(i);
                        if (eProp == null) continue;

                        // 使用稍小的间距并减小 preview 大小
                        using (new EditorGUILayout.HorizontalScope("box"))
                        {
                            // 左列 sprite 预览（固定宽）
                            using (new EditorGUILayout.VerticalScope(GUILayout.Width(80)))
                            {
                                var spriteProp = eProp.FindPropertyRelative("Sprite");
                                Sprite s = spriteProp.objectReferenceValue as Sprite;
                                EditorGUILayout.LabelField(s != null ? s.name : "<missing>", EditorStyles.boldLabel);

                                if (s != null)
                                {
                                    Texture2D preview = AssetPreview.GetAssetPreview(s);
                                    if (preview == null) preview = AssetPreview.GetMiniThumbnail(s);
                                    if (preview != null)
                                    {
                                        GUILayout.Label(preview, GUILayout.Width(previewSize), GUILayout.Height(previewSize));
                                    }
                                    else
                                    {
                                        EditorGUILayout.PropertyField(spriteProp, GUIContent.none, GUILayout.Width(previewSize), GUILayout.Height(previewSize));
                                    }
                                }
                                else
                                {
                                    EditorGUILayout.PropertyField(spriteProp, GUIContent.none, GUILayout.Width(previewSize), GUILayout.Height(previewSize));
                                }
                            }

                            // 右列 action 字段
                            EditorGUILayout.BeginVertical();
                            var actionProp = eProp.FindPropertyRelative("action");
                            EditorGUILayout.Space(2);
                            EditorGUILayout.PropertyField(actionProp, GUIContent.none, GUILayout.ExpandWidth(true));
                            EditorGUILayout.EndVertical();
                        }

                        EditorGUILayout.Space(4);
                    }

                    if (matchedTotal == 0)
                    {
                        EditorGUILayout.HelpBox("No entries match the search.", MessageType.Info);
                    }
                }
            }
        }

        EditorGUILayout.EndVertical();

        EditorGUILayout.Space(6);

        serializedObject.ApplyModifiedProperties();
    }

    // Ensure table with name exists (用于初次迁移)
    void EnsureDefaultTable(string name)
    {
        if (tablesProp == null) return;
        for (int i = 0; i < tablesProp.arraySize; ++i)
        {
            var t = tablesProp.GetArrayElementAtIndex(i);
            var nameProp = t.FindPropertyRelative("deviceName");
            if (nameProp != null && string.Equals(nameProp.stringValue, name, StringComparison.OrdinalIgnoreCase))
                return;
        }

        int idx = tablesProp.arraySize;
        tablesProp.InsertArrayElementAtIndex(idx);
        var newTable = tablesProp.GetArrayElementAtIndex(idx);
        var deviceNameProp = newTable.FindPropertyRelative("deviceName");
        if (deviceNameProp != null) deviceNameProp.stringValue = name;
        var tmpAssetProp = newTable.FindPropertyRelative("tmpAsset");
        if (tmpAssetProp != null) tmpAssetProp.objectReferenceValue = null;
        var entriesProp = newTable.FindPropertyRelative("entries");
        if (entriesProp != null) entriesProp.arraySize = 0;

        serializedObject.ApplyModifiedProperties();
        EditorUtility.SetDirty(db);
    }

    void SyncEditorListsWithTables()
    {
        int count = tablesProp != null ? tablesProp.arraySize : 0;
        if (searchStrings == null) searchStrings = new List<string>();
        if (currentPages == null) currentPages = new List<int>();

        while (searchStrings.Count < count) searchStrings.Add("");
        while (currentPages.Count < count) currentPages.Add(0);

        while (searchStrings.Count > count) searchStrings.RemoveAt(searchStrings.Count - 1);
        while (currentPages.Count > count) currentPages.RemoveAt(currentPages.Count - 1);
    }

    void EnsureEditorListsLength()
    {
        if (tablesProp == null) return;
        SyncEditorListsWithTables();
    }

    // Parse TMP Sprite Asset into table (保持你原有实现)
    void ParseTMPAssetIntoTableSerialized(SerializedProperty tableProp)
    {
        if (tableProp == null) return;
        var tmpAssetProp = tableProp.FindPropertyRelative("tmpAsset");
        var asset = tmpAssetProp.objectReferenceValue as TMP_SpriteAsset;
        if (asset == null) return;

        var entriesProp = tableProp.FindPropertyRelative("entries");
        if (entriesProp == null) return;

        entriesProp.arraySize = 0;

        var chars = asset.spriteCharacterTable;
        SpriteAtlas atlas = GetSpriteAtlasFromTMP(asset);
        string assetPath = AssetDatabase.GetAssetPath(asset);
        string assetFolder = Path.GetDirectoryName(assetPath);

        for (int i = 0; i < chars.Count; ++i)
        {
            var ch = chars[i];
            if (ch == null) continue;
            var name = ch.name;
            if (string.IsNullOrEmpty(name)) continue;

            Sprite s = null;
            try
            {
                var glyph = ch.glyph as TMP_SpriteGlyph;
                if (glyph != null && glyph.sprite != null) s = glyph.sprite;
            }
            catch { }

            if (s == null && atlas != null)
            {
                try { s = atlas.GetSprite(name); }
                catch { s = null; }

                if (s == null)
                {
                    try
                    {
                        var m = typeof(SpriteAtlas).GetMethod("GetSprite", new Type[] { typeof(string) });
                        if (m != null) s = m.Invoke(atlas, new object[] { name }) as Sprite;
                    }
                    catch { }
                }
            }

            if (s == null)
            {
                string[] scoped = AssetDatabase.FindAssets(name + " t:Sprite", new[] { assetFolder });
                if (scoped != null && scoped.Length > 0)
                {
                    foreach (var g in scoped)
                    {
                        var p = AssetDatabase.GUIDToAssetPath(g);
                        var sp = AssetDatabase.LoadAssetAtPath<Sprite>(p);
                        if (sp != null && sp.name == name)
                        {
                            s = sp;
                            break;
                        }
                    }
                }
            }

            if (s == null)
            {
                string[] all = AssetDatabase.FindAssets(name + " t:Sprite");
                if (all != null && all.Length > 0)
                {
                    foreach (var g in all)
                    {
                        var p = AssetDatabase.GUIDToAssetPath(g);
                        var sp = AssetDatabase.LoadAssetAtPath<Sprite>(p);
                        if (sp != null && sp.name == name)
                        {
                            s = sp;
                            break;
                        }
                    }
                }
            }

            int newIndex = entriesProp.arraySize;
            entriesProp.InsertArrayElementAtIndex(newIndex);
            var entryProp = entriesProp.GetArrayElementAtIndex(newIndex);
            var spriteProp = entryProp.FindPropertyRelative("Sprite");
            if (spriteProp != null) spriteProp.objectReferenceValue = s;
        }

        serializedObject.ApplyModifiedProperties();
        EditorUtility.SetDirty(db);
        AssetDatabase.SaveAssets();
    }

    SpriteAtlas GetSpriteAtlasFromTMP(TMP_SpriteAsset asset)
    {
        if (asset == null) return null;
        var t = asset.GetType();
        foreach (var f in t.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
        {
            if (typeof(SpriteAtlas).IsAssignableFrom(f.FieldType))
            {
                var val = f.GetValue(asset) as SpriteAtlas;
                if (val != null) return val;
            }
        }

        foreach (var p in t.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic))
        {
            if (typeof(SpriteAtlas).IsAssignableFrom(p.PropertyType))
            {
                try
                {
                    var val = p.GetValue(asset, null) as SpriteAtlas;
                    if (val != null) return val;
                }
                catch { }
            }
        }

        return null;
    }
}