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

[CustomEditor(typeof(AvatarOutfitController))]
public class AvatarOutfitControllerEditor : Editor
{
    private const string UxmlPath = "Assets/Scripts/Streamingle/StreamingleControl/Editor/UXML/AvatarOutfitControllerEditor.uxml";
    private const string UssPath = "Assets/Scripts/Streamingle/StreamingleControl/Editor/UXML/AvatarOutfitControllerEditor.uss";
    private const string CommonUssPath = "Assets/Scripts/Streamingle/StreamingleControl/Editor/UXML/StreamingleCommon.uss";

    private VisualElement avatarsContainer;
    private Label avatarsTitleLabel;
    private AvatarOutfitController controller;

    public override VisualElement CreateInspectorGUI()
    {
        controller = (AvatarOutfitController)target;
        var root = new VisualElement();

        var commonUss = AssetDatabase.LoadAssetAtPath<StyleSheet>(CommonUssPath);
        var uss = AssetDatabase.LoadAssetAtPath<StyleSheet>(UssPath);
        if (commonUss != null) root.styleSheets.Add(commonUss);
        if (uss != null) root.styleSheets.Add(uss);

        var uxml = AssetDatabase.LoadAssetAtPath<VisualTreeAsset>(UxmlPath);
        if (uxml != null) uxml.CloneTree(root);

        BuildAvatarsSection(root);

        Undo.undoRedoPerformed += OnUndoRedo;
        root.RegisterCallback<DetachFromPanelEvent>(_ => Undo.undoRedoPerformed -= OnUndoRedo);

        return root;
    }

    private void OnUndoRedo()
    {
        if (controller == null) return;
        serializedObject.Update();
        RebuildAvatarList();
    }

    #region Avatars List

    private void BuildAvatarsSection(VisualElement root)
    {
        var section = root.Q("avatarsSection");
        if (section == null) return;

        var header = new VisualElement();
        header.AddToClassList("list-header");

        avatarsTitleLabel = new Label($"아바타 ({controller.avatars.Count})");
        avatarsTitleLabel.AddToClassList("list-title");
        header.Add(avatarsTitleLabel);

        var addBtn = new Button(AddAvatar) { text = "+ 아바타 추가" };
        addBtn.AddToClassList("list-add-btn");
        header.Add(addBtn);

        section.Add(header);

        avatarsContainer = new VisualElement();
        section.Add(avatarsContainer);

        RebuildAvatarList();
    }

    private void RebuildAvatarList()
    {
        if (avatarsContainer == null || controller == null) return;
        avatarsContainer.Clear();

        if (avatarsTitleLabel != null)
            avatarsTitleLabel.text = $"아바타 ({controller.avatars.Count})";

        if (controller.avatars.Count == 0)
        {
            var empty = new Label("아바타가 없습니다. '+ 아바타 추가' 버튼을 눌러 추가하세요.");
            empty.AddToClassList("list-empty");
            avatarsContainer.Add(empty);
            return;
        }

        for (int i = 0; i < controller.avatars.Count; i++)
        {
            avatarsContainer.Add(CreateAvatarElement(i));
        }

        avatarsContainer.Bind(serializedObject);
    }

    private VisualElement CreateAvatarElement(int avatarIndex)
    {
        var avatar = controller.avatars[avatarIndex];

        var item = new VisualElement();
        item.AddToClassList("list-item");
        item.AddToClassList("avatar-item");

        // Header row
        var headerRow = new VisualElement();
        headerRow.AddToClassList("list-item-header");

        var indexLabel = new Label($"{avatarIndex + 1}");
        indexLabel.AddToClassList("list-index");
        headerRow.Add(indexLabel);

        var nameField = new TextField();
        nameField.value = avatar.avatarName;
        nameField.AddToClassList("list-name-field");
        int ai = avatarIndex;
        nameField.RegisterValueChangedCallback(evt =>
        {
            Undo.RecordObject(target, "Rename Avatar");
            controller.avatars[ai].avatarName = evt.newValue;
            EditorUtility.SetDirty(target);
        });
        headerRow.Add(nameField);

        // Reorder buttons
        var upBtn = new Button(() => SwapAvatars(ai, ai - 1)) { text = "\u25B2" };
        upBtn.AddToClassList("list-reorder-btn");
        upBtn.SetEnabled(avatarIndex > 0);
        headerRow.Add(upBtn);

        var downBtn = new Button(() => SwapAvatars(ai, ai + 1)) { text = "\u25BC" };
        downBtn.AddToClassList("list-reorder-btn");
        downBtn.SetEnabled(avatarIndex < controller.avatars.Count - 1);
        headerRow.Add(downBtn);

        var deleteBtn = new Button(() => DeleteAvatar(ai)) { text = "X" };
        deleteBtn.AddToClassList("list-delete-btn");
        headerRow.Add(deleteBtn);

        item.Add(headerRow);

        // Avatar fields
        var fields = new VisualElement();
        fields.AddToClassList("list-fields");

        var listProp = serializedObject.FindProperty("avatars");
        var avatarProp = listProp.GetArrayElementAtIndex(avatarIndex);

        // Outfits sub-list
        int outfitCount = avatar.outfits?.Length ?? 0;
        var outfitsFoldout = new Foldout { text = $"의상 ({outfitCount})", value = true };
        outfitsFoldout.AddToClassList("outfit-foldout");

        var outfitsContainer = new VisualElement();
        outfitsContainer.AddToClassList("outfits-container");

        if (avatar.outfits != null && avatar.outfits.Length > 0)
        {
            var outfitsProp = avatarProp.FindPropertyRelative("outfits");
            for (int oi = 0; oi < avatar.outfits.Length; oi++)
            {
                outfitsContainer.Add(CreateOutfitElement(avatarIndex, oi, outfitsProp.GetArrayElementAtIndex(oi)));
            }
        }
        else
        {
            var emptyOutfit = new Label("의상이 없습니다.");
            emptyOutfit.AddToClassList("list-empty");
            outfitsContainer.Add(emptyOutfit);
        }

        var addOutfitBtn = new Button(() => AddOutfit(ai)) { text = "+ 의상 추가" };
        addOutfitBtn.AddToClassList("list-add-btn");
        addOutfitBtn.style.marginTop = 4;
        outfitsContainer.Add(addOutfitBtn);

        outfitsFoldout.Add(outfitsContainer);
        fields.Add(outfitsFoldout);

        item.Add(fields);
        return item;
    }

    private VisualElement CreateOutfitElement(int avatarIndex, int outfitIndex, SerializedProperty outfitProp)
    {
        var avatar = controller.avatars[avatarIndex];
        var outfit = avatar.outfits[outfitIndex];
        bool isCurrentOutfit = avatar.CurrentOutfitIndex == outfitIndex;

        var outfitItem = new VisualElement();
        outfitItem.AddToClassList("outfit-item");
        if (isCurrentOutfit) outfitItem.AddToClassList("outfit-item--current");

        // Outfit header
        var outfitHeader = new VisualElement();
        outfitHeader.AddToClassList("outfit-header");

        var outfitIdx = new Label($"{outfitIndex + 1}");
        outfitIdx.AddToClassList("list-index");
        outfitHeader.Add(outfitIdx);

        var outfitNameField = new TextField();
        outfitNameField.value = outfit.outfitName;
        outfitNameField.AddToClassList("list-name-field");
        int ai = avatarIndex, oi = outfitIndex;
        outfitNameField.RegisterValueChangedCallback(evt =>
        {
            Undo.RecordObject(target, "Rename Outfit");
            controller.avatars[ai].outfits[oi].outfitName = evt.newValue;
            EditorUtility.SetDirty(target);
        });
        outfitHeader.Add(outfitNameField);

        if (isCurrentOutfit)
        {
            var currentLabel = new Label("[착용중]");
            currentLabel.AddToClassList("outfit-current-label");
            outfitHeader.Add(currentLabel);
        }

        var upOutfitBtn = new Button(() => SwapOutfits(ai, oi, oi - 1)) { text = "\u25B2" };
        upOutfitBtn.AddToClassList("list-reorder-btn");
        upOutfitBtn.SetEnabled(outfitIndex > 0);
        outfitHeader.Add(upOutfitBtn);

        var downOutfitBtn = new Button(() => SwapOutfits(ai, oi, oi + 1)) { text = "\u25BC" };
        downOutfitBtn.AddToClassList("list-reorder-btn");
        downOutfitBtn.SetEnabled(outfitIndex < avatar.outfits.Length - 1);
        outfitHeader.Add(downOutfitBtn);

        var deleteOutfitBtn = new Button(() => DeleteOutfit(ai, oi)) { text = "X" };
        deleteOutfitBtn.AddToClassList("list-delete-btn");
        outfitHeader.Add(deleteOutfitBtn);

        outfitItem.Add(outfitHeader);

        // Outfit fields
        var outfitFields = new VisualElement();
        outfitFields.AddToClassList("outfit-fields");

        var clothingField = new PropertyField(outfitProp.FindPropertyRelative("clothingObjects"), "의류 오브젝트");
        outfitFields.Add(clothingField);

        var hideField = new PropertyField(outfitProp.FindPropertyRelative("hideObjects"), "숨길 오브젝트");
        outfitFields.Add(hideField);

        // 변신 효과 Foldout (이 의상으로 변경해 들어올 때 재생)
        var fxFoldout = new Foldout { text = "변신 효과", value = false };
        fxFoldout.AddToClassList("transform-fx-foldout");
        var fxField = new PropertyField(outfitProp.FindPropertyRelative("transformEffect"), "");
        fxFoldout.Add(fxField);
        outfitFields.Add(fxFoldout);

        if (Application.isPlaying)
        {
            var testBtn = new Button(() => controller.SetAvatarOutfit(ai, oi))
            {
                text = isCurrentOutfit ? "현재 의상" : "▶ 이 의상으로 변경"
            };
            testBtn.AddToClassList("list-add-btn");
            testBtn.style.marginTop = 2;
            testBtn.SetEnabled(!isCurrentOutfit && !controller.IsAvatarTransforming(ai));
            outfitFields.Add(testBtn);
        }

        outfitItem.Add(outfitFields);
        return outfitItem;
    }

    #endregion

    #region Avatar Actions

    private void AddAvatar()
    {
        Undo.RecordObject(target, "Add Avatar");
        controller.avatars.Add(new AvatarOutfitController.AvatarData("새 아바타"));
        EditorUtility.SetDirty(target);
        serializedObject.Update();
        RebuildAvatarList();
    }

    private void DeleteAvatar(int index)
    {
        Undo.RecordObject(target, "Delete Avatar");
        controller.avatars.RemoveAt(index);
        EditorUtility.SetDirty(target);
        serializedObject.Update();
        RebuildAvatarList();
    }

    private void SwapAvatars(int a, int b)
    {
        Undo.RecordObject(target, "Reorder Avatars");
        (controller.avatars[a], controller.avatars[b]) = (controller.avatars[b], controller.avatars[a]);
        EditorUtility.SetDirty(target);
        serializedObject.Update();
        RebuildAvatarList();
    }

    private void AddOutfit(int avatarIndex)
    {
        Undo.RecordObject(target, "Add Outfit");
        var avatar = controller.avatars[avatarIndex];
        var outfits = avatar.outfits != null
            ? new List<AvatarOutfitController.OutfitData>(avatar.outfits)
            : new List<AvatarOutfitController.OutfitData>();
        outfits.Add(new AvatarOutfitController.OutfitData { outfitName = "새 의상" });
        avatar.outfits = outfits.ToArray();
        EditorUtility.SetDirty(target);
        serializedObject.Update();
        RebuildAvatarList();
    }

    private void SwapOutfits(int avatarIndex, int a, int b)
    {
        var avatar = controller.avatars[avatarIndex];
        if (avatar.outfits == null) return;
        if (a < 0 || a >= avatar.outfits.Length || b < 0 || b >= avatar.outfits.Length) return;
        if (a == b) return;

        // SerializedProperty 로만 처리해 직렬화 상태와 런타임 상태 간 동기 문제를 방지
        serializedObject.Update();
        var listProp = serializedObject.FindProperty("avatars");
        var avatarProp = listProp.GetArrayElementAtIndex(avatarIndex);
        var outfitsProp = avatarProp.FindPropertyRelative("outfits");

        // MoveArrayElement 는 인접 요소 이동이면 스왑과 동일 효과
        outfitsProp.MoveArrayElement(a, b);

        var currentIdxProp = avatarProp.FindPropertyRelative("currentOutfitIndex");
        if (currentIdxProp != null)
        {
            int cur = currentIdxProp.intValue;
            if (cur == a) currentIdxProp.intValue = b;
            else if (cur == b) currentIdxProp.intValue = a;
        }

        serializedObject.ApplyModifiedProperties();
        EditorUtility.SetDirty(target);
        RebuildAvatarList();
    }

    private void DeleteOutfit(int avatarIndex, int outfitIndex)
    {
        Undo.RecordObject(target, "Delete Outfit");
        var outfits = new List<AvatarOutfitController.OutfitData>(controller.avatars[avatarIndex].outfits);
        outfits.RemoveAt(outfitIndex);
        controller.avatars[avatarIndex].outfits = outfits.ToArray();
        EditorUtility.SetDirty(target);
        serializedObject.Update();
        RebuildAvatarList();
    }

    #endregion

}