using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

namespace Logic.Editor
{
    public class VisualSpriteVariantMapEditorWindow : EditorWindow
    {
        private const string DefaultMapAssetPath = "Assets/BundleResources/DataAssets/VisualSpriteVariantMap.asset";
        private const string GridAndResourceAssetPath = "Assets/BundleResources/Export/GridAndResourceDataAssets.asset";
        private const string EyeComfortGroundFolder = "Assets/BundleResources/ArtResources/TH1Grounds/EyeComfort";
        private const string EyeComfortMountainFolder = "Assets/BundleResources/ArtResources/TH1Mountains/EyeComfort";
        private const string EyeComfortForestFolder = "Assets/BundleResources/ArtResources/TH1Forests/EyeComfort";
        private const string GroundGroup = "GridObject/Ground";
        private const string MountainGroup = "GridObject/Mountain";
        private const string ForestGroup = "GridObject/Forest";

        private VisualSpriteVariantMapAsset _mapAsset;
        private GridAndResourceDataAssets _gridAsset;
        private Vector2 _scroll;

        [MenuItem("Tools/TH1/Visual Sprite Variant Map")]
        private static void OpenWindow()
        {
            var window = GetWindow<VisualSpriteVariantMapEditorWindow>();
            window.titleContent = new GUIContent("Sprite Variants");
            window.minSize = new Vector2(720, 420);
            window.LoadAssets();
        }

        [MenuItem("Tools/TH1/Visual Sprite Variant Map/Rebuild Map Feature EyeComfort")]
        private static void RebuildGroundFromMenu()
        {
            var window = CreateInstance<VisualSpriteVariantMapEditorWindow>();
            window.LoadAssets();
            window.RebuildMapFeatureMappings();
            DestroyImmediate(window);
        }

        private void OnEnable()
        {
            LoadAssets();
        }

        private void OnGUI()
        {
            EditorGUILayout.LabelField("Visual Sprite Variant Map", EditorStyles.boldLabel);
            using (new EditorGUILayout.HorizontalScope())
            {
                _mapAsset = (VisualSpriteVariantMapAsset)EditorGUILayout.ObjectField("Map Asset", _mapAsset, typeof(VisualSpriteVariantMapAsset), false);
                if (GUILayout.Button("Create/Load", GUILayout.Width(110)))
                    LoadOrCreateMapAsset();
            }

            _gridAsset = (GridAndResourceDataAssets)EditorGUILayout.ObjectField("Grid Asset", _gridAsset, typeof(GridAndResourceDataAssets), false);

            using (new EditorGUILayout.HorizontalScope())
            {
                if (GUILayout.Button("Rebuild Map Feature EyeComfort Mappings", GUILayout.Height(28)))
                    RebuildMapFeatureMappings();
                if (GUILayout.Button("Select Asset", GUILayout.Width(110), GUILayout.Height(28)) && _mapAsset != null)
                {
                    Selection.activeObject = _mapAsset;
                    EditorGUIUtility.PingObject(_mapAsset);
                }
            }

            EditorGUILayout.Space(8);

            if (_mapAsset == null)
            {
                EditorGUILayout.HelpBox("Create or load VisualSpriteVariantMap.asset first.", MessageType.Info);
                return;
            }

            int total = _mapAsset.Pairs?.Count ?? 0;
            int mapped = _mapAsset.CountMappedPairs(VisualTheme.EyeComfort);
            EditorGUILayout.LabelField($"Pairs: {total}    EyeComfort mapped: {mapped}");

            var serializedObject = new SerializedObject(_mapAsset);
            var pairsProperty = serializedObject.FindProperty("Pairs");
            _scroll = EditorGUILayout.BeginScrollView(_scroll);
            EditorGUILayout.PropertyField(pairsProperty, true);
            EditorGUILayout.EndScrollView();
            serializedObject.ApplyModifiedProperties();
        }

        private void LoadAssets()
        {
            _mapAsset = AssetDatabase.LoadAssetAtPath<VisualSpriteVariantMapAsset>(DefaultMapAssetPath);
            _gridAsset = AssetDatabase.LoadAssetAtPath<GridAndResourceDataAssets>(GridAndResourceAssetPath);
        }

        private void LoadOrCreateMapAsset()
        {
            _mapAsset = LoadOrCreateMapAsset(DefaultMapAssetPath);
        }

        private static VisualSpriteVariantMapAsset LoadOrCreateMapAsset(string path)
        {
            var asset = AssetDatabase.LoadAssetAtPath<VisualSpriteVariantMapAsset>(path);
            if (asset != null)
                return asset;

            var folder = System.IO.Path.GetDirectoryName(path)?.Replace("\\", "/");
            if (!string.IsNullOrEmpty(folder) && !AssetDatabase.IsValidFolder(folder))
                CreateFolders(folder);

            asset = CreateInstance<VisualSpriteVariantMapAsset>();
            AssetDatabase.CreateAsset(asset, path);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();
            return asset;
        }

        private void RebuildMapFeatureMappings()
        {
            _mapAsset = LoadOrCreateMapAsset(DefaultMapAssetPath);
            if (_gridAsset == null)
                _gridAsset = AssetDatabase.LoadAssetAtPath<GridAndResourceDataAssets>(GridAndResourceAssetPath);

            if (_gridAsset == null)
            {
                Debug.LogError($"[VisualSpriteVariantMap] Grid asset not found: {GridAndResourceAssetPath}");
                return;
            }

            Undo.RecordObject(_mapAsset, "Rebuild Map Feature EyeComfort Mappings");
            _mapAsset.Pairs.RemoveAll(pair => pair != null
                                              && (pair.Group == GroundGroup
                                                  || pair.Group == MountainGroup
                                                  || pair.Group == ForestGroup));

            int groundMapped = AddMappings(GroundGroup, CollectGroundSprites(_gridAsset), EyeComfortGroundFolder);
            int mountainMapped = AddMappings(MountainGroup, CollectMountainSprites(_gridAsset), EyeComfortMountainFolder);
            int forestMapped = AddMappings(ForestGroup, CollectForestSprites(_gridAsset), EyeComfortForestFolder);

            _mapAsset.RebuildCache();
            EditorUtility.SetDirty(_mapAsset);
            AssetDatabase.SaveAssets();
            AssetDatabase.Refresh();

            Debug.Log($"[VisualSpriteVariantMap] Rebuilt map feature pairs. Ground={groundMapped}, Mountain={mountainMapped}, Forest={forestMapped} matched EyeComfort sprites.");
        }

        private int AddMappings(string group, List<Sprite> sourceSprites, string replacementFolder)
        {
            var replacementByName = LoadSpritesByName(replacementFolder);
            int mapped = 0;
            foreach (var source in sourceSprites)
            {
                replacementByName.TryGetValue(source.name, out var replacement);
                if (replacement != null)
                    mapped++;

                _mapAsset.Pairs.Add(new VisualSpriteVariantPair
                {
                    Group = group,
                    Source = source,
                    EyeComfort = replacement
                });
            }

            return mapped;
        }

        private static List<Sprite> CollectGroundSprites(GridAndResourceDataAssets gridAsset)
        {
            var result = new List<Sprite>();
            var seen = new HashSet<Sprite>();

            if (gridAsset?.TerrainInfoList == null)
                return result;

            foreach (var terrain in gridAsset.TerrainInfoList)
            {
                if (terrain == null || terrain.TerrainType != TerrainType.Land)
                    continue;

                AddSprite(result, seen, terrain.Sprite);
                if (terrain.SpriteList == null)
                    continue;

                foreach (var spriteInfo in terrain.SpriteList)
                    AddSprite(result, seen, spriteInfo?.Sprite);
            }

            return result;
        }

        private static List<Sprite> CollectMountainSprites(GridAndResourceDataAssets gridAsset)
        {
            var result = new List<Sprite>();
            var seen = new HashSet<Sprite>();

            if (gridAsset?.MountainInfo?.SpriteList == null)
                return result;

            foreach (var spriteInfo in gridAsset.MountainInfo.SpriteList)
                AddSprite(result, seen, spriteInfo?.Sprite);

            return result;
        }

        private static List<Sprite> CollectForestSprites(GridAndResourceDataAssets gridAsset)
        {
            var result = new List<Sprite>();
            var seen = new HashSet<Sprite>();

            if (gridAsset?.VegetationInfo?.SpriteList == null)
                return result;

            foreach (var spriteInfo in gridAsset.VegetationInfo.SpriteList)
                AddSprite(result, seen, spriteInfo?.Sprite);

            return result;
        }

        private static void AddSprite(List<Sprite> result, HashSet<Sprite> seen, Sprite sprite)
        {
            if (sprite == null || seen.Contains(sprite))
                return;

            seen.Add(sprite);
            result.Add(sprite);
        }

        private static Dictionary<string, Sprite> LoadSpritesByName(string folder)
        {
            var result = new Dictionary<string, Sprite>();
            var guids = AssetDatabase.FindAssets("t:Sprite", new[] { folder });
            foreach (var guid in guids)
            {
                var path = AssetDatabase.GUIDToAssetPath(guid);
                var sprites = AssetDatabase.LoadAllAssetsAtPath(path);
                foreach (var asset in sprites)
                {
                    if (asset is Sprite sprite && !result.ContainsKey(sprite.name))
                        result[sprite.name] = sprite;
                }
            }

            return result;
        }

        private static void CreateFolders(string folder)
        {
            var parts = folder.Split('/');
            var current = parts[0];
            for (int i = 1; i < parts.Length; i++)
            {
                var next = $"{current}/{parts[i]}";
                if (!AssetDatabase.IsValidFolder(next))
                    AssetDatabase.CreateFolder(current, parts[i]);
                current = next;
            }
        }
    }
}