using System.Collections.Generic;
using System.IO;
using System.Linq;
using AppleHills.Data.CardSystem;
using UI.CardSystem;
using UnityEditor;
using UnityEngine;
using UnityEngine.UI;

namespace Editor.CardSystem
{
    /// <summary>
    /// Editor utility for managing card definitions with live preview using the same UI as in-game.
    /// </summary>
    public class CardEditorWindow : EditorWindow
    {
        // Paths
        private const string CardDefinitionsPath = "Assets/Data/Cards";
        private const string MenuPath = "AppleHills/Card Editor";
        private const string CardUIPrefabPath = "Assets/Prefabs/UI/Cards/Card.prefab";
        private const string CardVisualConfigPath = CardDefinitionsPath + "/CardVisualConfig.asset";
        
        // Preview settings
        private static readonly Vector2 PreviewCardSize = new Vector2(200f, 300f);
        private const float CameraPaddingFactor = 1.2f;
        
        // Editor state
        private List<CardDefinition> _cards = new List<CardDefinition>();
        private CardDefinition _selectedCard;
        private CardDefinition _editingCard;
        private Vector2 _cardListScrollPosition;
        private Vector2 _cardEditScrollPosition;
        private string _searchQuery = "";
        private bool _showPreview = true;
        private bool _isDirty = false;
        
        // Preview state
        private PreviewRenderUtility _previewUtility;
        private GameObject _previewRoot;
        private CardDisplay _previewCardDisplay;
        private GameObject _cardUIPrefab;
        private CardVisualConfig _cardVisualConfig;
        private float _zoomLevel = 1.0f;

        [MenuItem(MenuPath)]
        public static void ShowWindow()
        {
            var window = GetWindow<CardEditorWindow>("Card Editor");
            window.minSize = new Vector2(1000, 700);
            window.Show();
        }

        private void OnEnable()
        {
            LoadCardDefinitions();
            InitializePreview();
            Undo.undoRedoPerformed += OnUndoRedo;
        }

        private void OnDisable()
        {
            CleanupPreview();
            Undo.undoRedoPerformed -= OnUndoRedo;
        }

        private void OnUndoRedo()
        {
            LoadCardDefinitions();
            Repaint();
        }

        private void LoadCardDefinitions()
        {
            _cards.Clear();
            
            // Ensure directory exists
            if (!Directory.Exists(CardDefinitionsPath))
            {
                Directory.CreateDirectory(CardDefinitionsPath);
                AssetDatabase.Refresh();
            }
            
            // Find all card definitions
            string[] guids = AssetDatabase.FindAssets("t:CardDefinition", new[] { CardDefinitionsPath });
            foreach (string guid in guids)
            {
                string path = AssetDatabase.GUIDToAssetPath(guid);
                CardDefinition card = AssetDatabase.LoadAssetAtPath<CardDefinition>(path);
                if (card != null)
                {
                    _cards.Add(card);
                }
            }
            
            _cards = _cards.OrderBy(c => c.Name).ToList();
            
            // Restore selection if possible
            if (_selectedCard != null)
            {
                _selectedCard = _cards.FirstOrDefault(c => c.Id == _selectedCard.Id);
                if (_selectedCard != null)
                {
                    _editingCard = CloneCard(_selectedCard);
                    UpdatePreview();
                }
            }
        }

        private void InitializePreview()
        {
            if (_previewUtility == null)
            {
                _previewUtility = new PreviewRenderUtility();
                
                var cam = _previewUtility.camera;
                cam.clearFlags = CameraClearFlags.SolidColor;
                cam.backgroundColor = new Color(0.2f, 0.2f, 0.2f);
                cam.orthographic = true;
                
                // Calculate ortho size based on card height with padding
                float baseOrthoSize = (PreviewCardSize.y / 2f) * CameraPaddingFactor;
                cam.orthographicSize = baseOrthoSize;
                
                cam.nearClipPlane = 0.01f;
                cam.farClipPlane = 100f;
                cam.transform.position = new Vector3(0, 0, -10);
                cam.transform.rotation = Quaternion.identity;
            }
            
            // Load prefab and config
            _cardUIPrefab = AssetDatabase.LoadAssetAtPath<GameObject>(CardUIPrefabPath);
            if (_cardUIPrefab == null)
            {
                Debug.LogError($"[CardEditorWindow] Card UI prefab not found at {CardUIPrefabPath}");
            }
            
            _cardVisualConfig = AssetDatabase.LoadAssetAtPath<CardVisualConfig>(CardVisualConfigPath);
            if (_cardVisualConfig == null)
            {
                Debug.LogWarning($"[CardEditorWindow] Card visual config not found at {CardVisualConfigPath}");
            }
            
            CreatePreviewCardObject();
        }

        private void CreatePreviewCardObject()
        {
            CleanupPreviewInstance();
            
            if (_cardUIPrefab == null || _previewUtility == null)
                return;

            try
            {
                // Create root and canvas
                _previewRoot = new GameObject("PreviewRoot");
                _previewRoot.hideFlags = HideFlags.HideAndDontSave;
                
                GameObject canvasGO = new GameObject("PreviewCanvas");
                canvasGO.transform.SetParent(_previewRoot.transform, false);
                
                Canvas canvas = canvasGO.AddComponent<Canvas>();
                canvas.renderMode = RenderMode.WorldSpace;
                canvas.worldCamera = _previewUtility.camera;
                
                RectTransform canvasRect = canvasGO.GetComponent<RectTransform>();
                canvasRect.sizeDelta = new Vector2(20f, 20f);
                canvasRect.localPosition = Vector3.zero;
                
                CanvasScaler scaler = canvasGO.AddComponent<CanvasScaler>();
                scaler.uiScaleMode = CanvasScaler.ScaleMode.ConstantPixelSize;
                scaler.scaleFactor = 1f;
                
                canvasGO.AddComponent<GraphicRaycaster>();
                
                // Instantiate card prefab
                GameObject cardInstance = Instantiate(_cardUIPrefab, canvasGO.transform, false);
                
                RectTransform cardRect = cardInstance.GetComponent<RectTransform>();
                if (cardRect != null)
                {
                    // Set explicit size for preview
                    cardRect.sizeDelta = PreviewCardSize;
                    
                    // Anchor to center
                    cardRect.anchorMin = new Vector2(0.5f, 0.5f);
                    cardRect.anchorMax = new Vector2(0.5f, 0.5f);
                    cardRect.pivot = new Vector2(0.5f, 0.5f);
                    cardRect.anchoredPosition = Vector2.zero;
                }
                
                // Get CardDisplay component
                _previewCardDisplay = cardInstance.GetComponent<CardDisplay>();
                if (_previewCardDisplay == null)
                {
                    _previewCardDisplay = cardInstance.GetComponentInChildren<CardDisplay>();
                }
                
                if (_previewCardDisplay != null && _cardVisualConfig != null)
                {
                    _previewCardDisplay.SetVisualConfig(_cardVisualConfig);
                }
                
                _previewUtility.AddSingleGO(_previewRoot);
                
                // Update camera
                UpdatePreviewCamera();
            }
            catch (System.Exception e)
            {
                Debug.LogError($"[CardEditorWindow] Error creating preview: {e.Message}");
            }
        }

        private void UpdatePreviewCamera()
        {
            if (_previewUtility == null) return;
            
            Camera cam = _previewUtility.camera;
            
            // Calculate base ortho size from card height with padding
            float baseOrthoSize = (PreviewCardSize.y / 2f) * CameraPaddingFactor;
            
            // Apply zoom as divisor (higher zoom = smaller ortho size = more zoomed in)
            cam.orthographicSize = baseOrthoSize / _zoomLevel;
        }

        private void CleanupPreviewInstance()
        {
            if (_previewRoot != null)
            {
                DestroyImmediate(_previewRoot);
                _previewRoot = null;
            }
            _previewCardDisplay = null;
        }

        private void CleanupPreview()
        {
            CleanupPreviewInstance();
            
            if (_previewUtility != null)
            {
                _previewUtility.Cleanup();
                _previewUtility = null;
            }
        }

        private void UpdatePreview()
        {
            if (_editingCard == null || _previewCardDisplay == null || !_showPreview)
                return;

            try
            {
                // Create CardData from definition and setup the display
                CardData previewData = _editingCard.CreateCardData();
                _previewCardDisplay.SetupCard(previewData);
                Repaint();
            }
            catch (System.Exception ex)
            {
                Debug.LogError($"[CardEditorWindow] Error updating preview: {ex.Message}");
            }
        }

        private void OnGUI()
        {
            EditorGUILayout.BeginHorizontal();
            
            // Left panel - Card list
            DrawCardList();
            
            // Middle panel - Card editor
            DrawCardEditor();
            
            // Right panel - Preview
            if (_showPreview)
            {
                DrawPreview();
            }
            
            EditorGUILayout.EndHorizontal();
        }

        private void DrawCardList()
        {
            EditorGUILayout.BeginVertical(GUILayout.Width(250));
            
            EditorGUILayout.LabelField("Card List", EditorStyles.boldLabel);
            
            // Search bar
            EditorGUILayout.BeginHorizontal();
            _searchQuery = EditorGUILayout.TextField(_searchQuery, EditorStyles.toolbarSearchField);
            if (GUILayout.Button("X", GUILayout.Width(20)))
            {
                _searchQuery = "";
                GUI.FocusControl(null);
            }
            EditorGUILayout.EndHorizontal();
            
            // New card button
            if (GUILayout.Button("Create New Card"))
            {
                CreateNewCard();
            }
            
            // Card list
            _cardListScrollPosition = EditorGUILayout.BeginScrollView(_cardListScrollPosition);
            
            var filteredCards = string.IsNullOrEmpty(_searchQuery)
                ? _cards
                : _cards.Where(c => c.Name.ToLower().Contains(_searchQuery.ToLower())).ToList();
            
            foreach (var card in filteredCards)
            {
                bool isSelected = _selectedCard == card;
                
                GUI.backgroundColor = isSelected ? Color.cyan : Color.white;
                if (GUILayout.Button(card.Name, EditorStyles.miniButton))
                {
                    SelectCard(card);
                }
                GUI.backgroundColor = Color.white;
            }
            
            EditorGUILayout.EndScrollView();
            
            EditorGUILayout.EndVertical();
        }

        private void DrawCardEditor()
        {
            EditorGUILayout.BeginVertical(GUILayout.Width(350));
            
            if (_editingCard == null)
            {
                EditorGUILayout.HelpBox("Select a card from the list or create a new one.", MessageType.Info);
                EditorGUILayout.EndVertical();
                return;
            }
            
            EditorGUILayout.LabelField("Card Editor", EditorStyles.boldLabel);
            
            _cardEditScrollPosition = EditorGUILayout.BeginScrollView(_cardEditScrollPosition);
            
            EditorGUI.BeginChangeCheck();
            
            // Basic Info
            EditorGUILayout.LabelField("Basic Information", EditorStyles.boldLabel);
            _editingCard.Name = EditorGUILayout.TextField("Name", _editingCard.Name);
            
            // Custom file name option
            _editingCard.UseCustomFileName = EditorGUILayout.Toggle("Use Custom File Name", _editingCard.UseCustomFileName);
            
            GUI.enabled = _editingCard.UseCustomFileName;
            _editingCard.CustomFileName = EditorGUILayout.TextField("Custom File Name", _editingCard.CustomFileName);
            GUI.enabled = true;
            
            _editingCard.Description = EditorGUILayout.TextArea(_editingCard.Description, GUILayout.Height(60));
            
            EditorGUILayout.Space();
            
            // Properties
            EditorGUILayout.LabelField("Properties", EditorStyles.boldLabel);
            _editingCard.Rarity = (CardRarity)EditorGUILayout.EnumPopup("Rarity", _editingCard.Rarity);
            _editingCard.Zone = (CardZone)EditorGUILayout.EnumPopup("Zone", _editingCard.Zone);
            
            EditorGUILayout.Space();
            
            // Visuals
            EditorGUILayout.LabelField("Visuals", EditorStyles.boldLabel);
            _editingCard.CardImage = (Sprite)EditorGUILayout.ObjectField("Card Image", _editingCard.CardImage, typeof(Sprite), false);
            
            EditorGUILayout.Space();
            EditorGUILayout.HelpBox("Card visuals (frames, overlays, backgrounds, shapes) are configured in CardVisualConfig asset based on rarity and zone.", MessageType.Info);
            
            // Collection
            EditorGUILayout.Space();
            EditorGUILayout.LabelField("Collection", EditorStyles.boldLabel);
            _editingCard.CollectionIndex = EditorGUILayout.IntField("Collection Index", _editingCard.CollectionIndex);
            
            EditorGUILayout.Space();
            
            // Identification
            EditorGUILayout.LabelField("Identification", EditorStyles.boldLabel);
            GUI.enabled = false;
            EditorGUILayout.TextField("ID", _editingCard.Id);
            GUI.enabled = true;
            
            if (EditorGUI.EndChangeCheck())
            {
                _isDirty = true;
                UpdatePreview();
            }
            
            EditorGUILayout.EndScrollView();
            
            // Action buttons
            EditorGUILayout.Space();
            EditorGUILayout.BeginHorizontal();
            
            GUI.enabled = _isDirty;
            if (GUILayout.Button("Apply Changes"))
            {
                ApplyChanges();
            }
            GUI.enabled = true;
            
            if (GUILayout.Button("Revert"))
            {
                RevertChanges();
            }
            
            EditorGUILayout.EndHorizontal();
            
            EditorGUILayout.BeginHorizontal();
            
            if (GUILayout.Button("Duplicate"))
            {
                DuplicateCard();
            }
            
            GUI.backgroundColor = Color.red;
            if (GUILayout.Button("Delete"))
            {
                DeleteCard();
            }
            GUI.backgroundColor = Color.white;
            
            EditorGUILayout.EndHorizontal();
            
            EditorGUILayout.EndVertical();
        }

        private void DrawPreview()
        {
            EditorGUILayout.BeginVertical();
            
            EditorGUILayout.BeginHorizontal();
            EditorGUILayout.LabelField("Preview", EditorStyles.boldLabel);
            _zoomLevel = EditorGUILayout.Slider("Zoom", _zoomLevel, 0.5f, 2.0f);
            EditorGUILayout.EndHorizontal();
            
            if (Event.current.type == EventType.Repaint && _zoomLevel != _previewUtility.camera.orthographicSize)
            {
                UpdatePreviewCamera();
            }
            
            Rect previewRect = GUILayoutUtility.GetRect(400, 600);
            
            if (_previewUtility != null && _editingCard != null)
            {
                _previewUtility.BeginPreview(previewRect, GUIStyle.none);
                
                _previewUtility.camera.Render();
                
                Texture resultTexture = _previewUtility.EndPreview();
                GUI.DrawTexture(previewRect, resultTexture, ScaleMode.ScaleToFit, false);
            }
            else
            {
                EditorGUI.DrawRect(previewRect, new Color(0.2f, 0.2f, 0.2f));
                EditorGUI.LabelField(previewRect, "No Preview Available", EditorStyles.centeredGreyMiniLabel);
            }
            
            EditorGUILayout.EndVertical();
        }

        private void SelectCard(CardDefinition card)
        {
            if (_isDirty && _selectedCard != null)
            {
                if (EditorUtility.DisplayDialog("Unsaved Changes",
                    "You have unsaved changes. Apply them before switching cards?",
                    "Apply", "Discard"))
                {
                    ApplyChanges();
                }
            }
            
            _selectedCard = card;
            _editingCard = CloneCard(card);
            _isDirty = false;
            UpdatePreview();
        }

        private void CreateNewCard()
        {
            CardDefinition newCard = CreateInstance<CardDefinition>();
            newCard.Id = System.Guid.NewGuid().ToString();
            newCard.Name = "New Card";
            newCard.Description = "Card description";
            newCard.Rarity = CardRarity.Normal;
            newCard.Zone = CardZone.AppleHills;
            newCard.CollectionIndex = _cards.Count;
            
            string path = $"{CardDefinitionsPath}/Card_{newCard.Name}.asset";
            path = AssetDatabase.GenerateUniqueAssetPath(path);
            
            AssetDatabase.CreateAsset(newCard, path);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            
            LoadCardDefinitions();
            SelectCard(newCard);
        }

        private void ApplyChanges()
        {
            if (_selectedCard == null || _editingCard == null)
                return;
            
            Undo.RecordObject(_selectedCard, "Modify Card");
            
            string oldPath = AssetDatabase.GetAssetPath(_selectedCard);
            
            EditorUtility.CopySerialized(_editingCard, _selectedCard);
            
            EditorUtility.SetDirty(_selectedCard);
            AssetDatabase.SaveAssets();
            
            // Rename file if needed
            string desiredFileName = _selectedCard.UseCustomFileName && !string.IsNullOrEmpty(_selectedCard.CustomFileName)
                ? _selectedCard.CustomFileName
                : _selectedCard.Name;
            
            if (!string.IsNullOrEmpty(desiredFileName))
            {
                // Strip spaces from file name
                desiredFileName = desiredFileName.Replace(" ", "");
                
                string directory = Path.GetDirectoryName(oldPath);
                string extension = Path.GetExtension(oldPath);
                string currentFileName = Path.GetFileNameWithoutExtension(oldPath);
                string expectedFileName = $"Card_{desiredFileName}";
                
                // Only rename if the current file name doesn't match the expected name
                if (currentFileName != expectedFileName)
                {
                    string newPath = Path.Combine(directory, $"{expectedFileName}{extension}");
                    string uniquePath = AssetDatabase.GenerateUniqueAssetPath(newPath);
                    string error = AssetDatabase.MoveAsset(oldPath, uniquePath);
                    
                    if (!string.IsNullOrEmpty(error))
                    {
                        Debug.LogError($"[CardEditorWindow] Failed to rename asset: {error}");
                    }
                    else
                    {
                        AssetDatabase.SaveAssets();
                        AssetDatabase.Refresh();
                    }
                }
            }
            
            _isDirty = false;
            
            Debug.Log($"[CardEditorWindow] Applied changes to {_selectedCard.Name}");
        }

        private void RevertChanges()
        {
            if (_selectedCard == null)
                return;
            
            _editingCard = CloneCard(_selectedCard);
            _isDirty = false;
            UpdatePreview();
        }

        private void DuplicateCard()
        {
            if (_selectedCard == null)
                return;
            
            CardDefinition duplicate = Instantiate(_selectedCard);
            duplicate.Id = System.Guid.NewGuid().ToString();
            duplicate.Name = _selectedCard.Name + " (Copy)";
            
            string path = $"{CardDefinitionsPath}/Card_{duplicate.Name}.asset";
            path = AssetDatabase.GenerateUniqueAssetPath(path);
            
            AssetDatabase.CreateAsset(duplicate, path);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            
            LoadCardDefinitions();
            SelectCard(duplicate);
        }

        private void DeleteCard()
        {
            if (_selectedCard == null)
                return;
            
            if (!EditorUtility.DisplayDialog("Delete Card",
                $"Are you sure you want to delete '{_selectedCard.Name}'?",
                "Delete", "Cancel"))
            {
                return;
            }
            
            string path = AssetDatabase.GetAssetPath(_selectedCard);
            AssetDatabase.DeleteAsset(path);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            
            _selectedCard = null;
            _editingCard = null;
            _isDirty = false;
            
            LoadCardDefinitions();
            CleanupPreviewInstance();
            CreatePreviewCardObject();
        }

        private CardDefinition CloneCard(CardDefinition original)
        {
            CardDefinition clone = CreateInstance<CardDefinition>();
            EditorUtility.CopySerialized(original, clone);
            return clone;
        }
    }
}