using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using UnityEditor;
using UnityEngine;
using UnityEngine.U2D;
using TMPro;
using UnityEngine.InputSystem;
using InputGlyphsFramework;

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

    int tabIndex = 0;
    string[] tabNames = new string[] { "Keyboard", "Xbox", "PlayStation", "Other" };

    // Pagination
    const int itemsPerPage = 10; // 10 items per page as requested
    int currentPage = 0;

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

        // Ensure serialized list exists
        if (tablesProp == null)
        {
            // If the field name is different, user should fix it in their class or here.
            Debug.LogError("Could not find serialized property 'tables' on InputGlyphDatabase. Check field name.");
        }
    }

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

        EditorGUILayout.Space();
        tabIndex = GUILayout.Toolbar(tabIndex, tabNames, GUILayout.Height(24));
        var curDevice = (InputDeviceWatcher.InputDeviceCategory)tabIndex;

        // Ensure all 4 tables exist (serialized-safe)
        EnsureTableFor(InputDeviceWatcher.InputDeviceCategory.Keyboard);
        EnsureTableFor(InputDeviceWatcher.InputDeviceCategory.Xbox);
        EnsureTableFor(InputDeviceWatcher.InputDeviceCategory.PlayStation);
        EnsureTableFor(InputDeviceWatcher.InputDeviceCategory.Other);

        var tableProp = GetTablePropertyFor(curDevice);
        if (tableProp == null)
        {
            EditorGUILayout.HelpBox("Table not found (this should not happen).", MessageType.Warning);
            serializedObject.ApplyModifiedProperties();
            return;
        }

        EditorGUILayout.BeginVertical("box");
        EditorGUILayout.LabelField(curDevice.ToString(), EditorStyles.boldLabel);

        var tmpAssetProp = tableProp.FindPropertyRelative("tmpAsset");
        EditorGUILayout.PropertyField(tmpAssetProp, new GUIContent("TMP Sprite Asset"));

        EditorGUILayout.BeginHorizontal();
        if (GUILayout.Button("Parse TMP Asset"))
        {
            ParseTMPAssetIntoTableSerialized(tableProp);
        }

        if (GUILayout.Button("Clear"))
        {
            var entriesProp = tableProp.FindPropertyRelative("entries");
            entriesProp.arraySize = 0;
            serializedObject.ApplyModifiedProperties();
            EditorUtility.SetDirty(db);
            currentPage = 0;
        }

        EditorGUILayout.EndHorizontal();

        EditorGUILayout.Space();

        var entries = tableProp.FindPropertyRelative("entries");
        if (entries != null)
        {
            int total = entries.arraySize;
            int totalPages = Mathf.Max(1, (total + itemsPerPage - 1) / itemsPerPage);
            currentPage = Mathf.Clamp(currentPage, 0, totalPages - 1);

            // Pagination controls
            EditorGUILayout.BeginHorizontal();
            if (GUILayout.Button("<<", GUILayout.Width(40))) { currentPage = 0; }
            if (GUILayout.Button("<", GUILayout.Width(40))) { currentPage = Mathf.Max(0, currentPage - 1); }

            GUILayout.FlexibleSpace();
            EditorGUILayout.LabelField(string.Format("Page {0}/{1}", currentPage + 1, totalPages), GUILayout.Width(100));
            GUILayout.FlexibleSpace();

            if (GUILayout.Button(">", GUILayout.Width(40))) { currentPage = Mathf.Min(totalPages - 1, currentPage + 1); }
            if (GUILayout.Button(">>", GUILayout.Width(40))) { currentPage = totalPages - 1; }
            EditorGUILayout.EndHorizontal();

            EditorGUILayout.Space(4);

            int start = currentPage * itemsPerPage;
            int end = Mathf.Min(start + itemsPerPage, total);

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

                using (new EditorGUILayout.HorizontalScope("box"))
                {
                    // Left column: sprite preview (fixed width)
                    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(64), GUILayout.Height(64));
                            }
                            else
                            {
                                EditorGUILayout.PropertyField(spriteProp, GUIContent.none, GUILayout.Width(64), GUILayout.Height(64));
                            }
                        }
                        else
                        {
                            EditorGUILayout.PropertyField(spriteProp, GUIContent.none, GUILayout.Width(64), GUILayout.Height(64));
                        }
                    }

                    // Right column: path + action should take the remaining width
                    EditorGUILayout.BeginVertical();

                    var pathProp = eProp.FindPropertyRelative("controlPath");
                    var actionProp = eProp.FindPropertyRelative("action");

                    EditorGUILayout.PropertyField(pathProp, GUIContent.none, GUILayout.ExpandWidth(true));

                    EditorGUILayout.Space(2);

                    EditorGUILayout.PropertyField(actionProp, GUIContent.none, GUILayout.ExpandWidth(true));

                    EditorGUILayout.EndVertical();
                }

                EditorGUILayout.Space(6);
            }
        }

        EditorGUILayout.EndVertical();

        EditorGUILayout.Space();
        if (GUILayout.Button("Save Asset"))
        {
            serializedObject.ApplyModifiedProperties();
            EditorUtility.SetDirty(db);
            AssetDatabase.SaveAssets();
        }

        serializedObject.ApplyModifiedProperties();
    }

    // Ensure a table for the device exists. Uses serialized properties (adds element if necessary).
    void EnsureTableFor(InputDeviceWatcher.InputDeviceCategory device)
    {
        if (tablesProp == null) return;

        // Search existing entries
        for (int i = 0; i < tablesProp.arraySize; ++i)
        {
            var t = tablesProp.GetArrayElementAtIndex(i);
            var devProp = t.FindPropertyRelative("deviceType");
            if (devProp != null && devProp.enumValueIndex == (int)device)
                return; // exists
        }

        // Not found -> append new element
        int idx = tablesProp.arraySize;
        tablesProp.InsertArrayElementAtIndex(idx); // Inserts a copy if exists, otherwise default
        var newTable = tablesProp.GetArrayElementAtIndex(idx);

        var deviceTypeProp = newTable.FindPropertyRelative("deviceType");
        if (deviceTypeProp != null) deviceTypeProp.enumValueIndex = (int)device;

        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);
    }

    // Return the SerializedProperty representing the DeviceGlyphTable that matches device
    SerializedProperty GetTablePropertyFor(InputDeviceWatcher.InputDeviceCategory device)
    {
        if (tablesProp == null) return null;
        for (int i = 0; i < tablesProp.arraySize; ++i)
        {
            var t = tablesProp.GetArrayElementAtIndex(i);
            var devProp = t.FindPropertyRelative("deviceType");
            if (devProp != null && devProp.enumValueIndex == (int)device)
                return t;
        }

        return null;
    }

    // Parse TMP Sprite Asset and populate entries (serialized)
    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;
                        }
                    }
                }
            }

            // Create new entry and assign fields
            int newIndex = entriesProp.arraySize;
            entriesProp.InsertArrayElementAtIndex(newIndex);
            var entryProp = entriesProp.GetArrayElementAtIndex(newIndex);

            var spriteProp = entryProp.FindPropertyRelative("Sprite");
            var controlPathProp = entryProp.FindPropertyRelative("controlPath");

            if (spriteProp != null) spriteProp.objectReferenceValue = s;
            if (controlPathProp != null) controlPathProp.stringValue = string.Empty;
        }

        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;
    }
}