using System;
using System.Collections.Generic;
using System.Xml.Linq;

namespace Data
{
    public enum Orientation
    {
        Down,
        Left,
        Right,
        Up
    }

    public enum DrawNodeType
    {
        Image,
        Animation
    }

    public class CharacterDef : Define
    {
        public DrawingOrderDef
            drawingOrder_down,
            drawingOrder_up,
            drawingOrder_left,
            drawingOrder_right;

        public DrawingOrderDef GetDrawingOrder(Orientation orientation)
        {
            // 定义一个临时变量用于存储结果
            DrawingOrderDef result = null;

            // 根据传入的 Orientation 获取对应的 DrawingOrderDef
            switch (orientation)
            {
                case Orientation.Down:
                    result = drawingOrder_down;
                    break;
                case Orientation.Up:
                    result = drawingOrder_up;
                    break;
                case Orientation.Left:
                    result = drawingOrder_left;
                    break;
                case Orientation.Right:
                    result = drawingOrder_right;
                    break;
                default:
                    throw new ArgumentException("Invalid orientation value.");
            }

            // 如果当前方向的结果为空，则尝试用 drawingOrder_down 填充
            if (result == null) result = drawingOrder_down;

            // 如果 drawingOrder_down 仍然为空，则尝试用其他非空方向填充
            if (result == null) result = drawingOrder_up ?? drawingOrder_left ?? drawingOrder_right;

            return result;
        }
    }

    public class DrawingOrderDef : Define
    {
        public List<DrawNodeDef> drawNodes = new();

        public override bool Init(XElement xmlDef)
        {
            base.Init(xmlDef);
            foreach (var node in xmlDef.Elements("DrawNodeDef"))
            {
                var drawNode = new DrawNodeDef();
                drawNode.Init(node);
                drawNodes.Add(drawNode);
            }

            return true;
        }
    }

    public class DrawNodeDef : Define
    {
        public List<DrawNodeDef> children = new();
        public DrawNodeType drawNodeType = DrawNodeType.Image;
        public string nodeName;

        public override bool Init(XElement xmlDef)
        {
            base.Init(xmlDef);
            nodeName = xmlDef.Attribute("name")?.Value;
            foreach (var childNode in xmlDef.Elements("DrawNodeDef"))
            {
                var child = new DrawNodeDef();
                child.Init(childNode);
                children.Add(child);
            }

            return true;
        }
    }
}