using System;
using Ichni.RhythmGame;
using Lean.Pool;
using UnityEngine;

namespace Ichni.Editor
{
    /// <summary>
    /// 处理所有 Enum 类型的 Drawer。
    /// 通过反射获取字段的枚举类型，创建 DynamicUIEnumDropdown。
    /// </summary>
    public class EnumDropdownDrawer : IPropertyDrawer
    {
        public int DefaultSpan => 1;
        public float DefaultHeight => LayoutPacker.DefaultRowHeight;

        public DynamicUIElement Draw(DrawContext ctx)
        {
            var go = LeanPool.Spawn(ctx.Registry.GetPrefab("enumDropdown"), ctx.Parent);
            var element = go.GetComponent<DynamicUIEnumDropdown>();

            // 获取枚举类型：优先使用 DrawContext 中的 EnumType，fallback 到反射
            Type enumType = ctx.EnumType;
            if (enumType == null && ctx.Target != null && !string.IsNullOrEmpty(ctx.FieldName))
            {
                var field = ctx.Target.GetType().GetField(ctx.FieldName);
                if (field != null) enumType = field.FieldType;
                else
                {
                    var prop = ctx.Target.GetType().GetProperty(ctx.FieldName);
                    if (prop != null) enumType = prop.PropertyType;
                }
            }

            if (enumType != null)
            {
                element.SetUpEnum(enumType);
            }

            element.Initialize(ctx.Target, ctx.Label, ctx.FieldName);

            int span = ctx.OverrideSpan ?? DefaultSpan;
            float height = ctx.OverrideHeight ?? DefaultHeight;
            element.SetLayoutSize(span * LayoutPacker.TotalRowWidth / LayoutPacker.MaxSpanPerRow, height);

            return element;
        }
    }
}