using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Xml.Linq;
using UnityEditor.ShaderGraph.Internal;
using UnityEngine;

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

    public enum DrawNodeType
    {
        Image,
        Animation
    }

    public class CharacterDef : PawnDef
    {
    }

    public class DrawingOrderDef : Define
    {
        public List<DrawNodeDef> drawNodes = new();
        public override bool Init(XElement xmlDef)
        {
            base.Init(xmlDef);

            var nodes = xmlDef.Elements("DrawNodeDef");
            var xElements = nodes as XElement[] ?? nodes.ToArray();
            if (!xElements.Any())
                return false;
            foreach (var node in xElements)
            {
                var drawNode = new DrawNodeDef();
                drawNode.Init(node);
                drawNodes.Add(drawNode);
            }

            return true;;
        }
        // 重载 == 运算符
        public static bool operator ==(DrawingOrderDef a, DrawingOrderDef b)
        {
            if (ReferenceEquals(a, b)) return true; // 如果是同一个对象，直接返回 true
            if (ReferenceEquals(a, null) || ReferenceEquals(b, null)) return false; // 如果其中一个为 null，返回 false

            return AreEqual(a, b);
        }

        // 重载 != 运算符
        public static bool operator !=(DrawingOrderDef a, DrawingOrderDef b)
        {
            return !(a == b);
        }

        // 判断两个 DrawingOrderDef 是否相等
        private static bool AreEqual(DrawingOrderDef a, DrawingOrderDef b)
        {
            // 比较 drawNodes 的数量
            if (a.drawNodes.Count != b.drawNodes.Count)
                return false;

            // 递归比较每个 DrawNodeDef
            for (int i = 0; i < a.drawNodes.Count; i++)
            {
                if (!DrawNodeDef.AreEqual(a.drawNodes[i], b.drawNodes[i]))
                    return false;
            }

            return true;
        }
    }

    public class DrawNodeDef : Define
    {
        public List<DrawNodeDef> children = new();
        public DrawNodeType drawNodeType = DrawNodeType.Image;
        public string nodeName;
        public Vector2 position = new(0, 0);
        public float FPS = 1;

        public override bool Init(XElement xmlDef)
        {
            base.Init(xmlDef);

            nodeName = xmlDef.Attribute("name")?.Value;
            drawNodeType = Enum.TryParse(xmlDef.Attribute("type")?.Value, true, out DrawNodeType typeResult)
                ? typeResult
                : DrawNodeType.Image;

            position = StringToVector(xmlDef.Attribute("position")?.Value ?? "(0 0)");
            FPS = float.TryParse(xmlDef.Attribute("FPS")?.Value, out float result) ? result : 1.0f;
            foreach (var childNode in xmlDef.Elements("DrawNodeDef"))
            {
                var child = new DrawNodeDef();
                child.Init(childNode);
                children.Add(child);
            }
            return true;
        }
        public Vector2 StringToVector(string vectorDef)
        {
            // 去掉可能存在的括号和多余的空格
            var cleanedInput = vectorDef.Replace("(", "").Replace(")", "").Trim();

            // 使用正则表达式匹配两个浮点数
            var match = Regex.Match(cleanedInput, @"\s*(-?\d+(\.\d*)?)\s*[, ]\s*(-?\d+(\.\d*)?)\s*");

            if (match.Success)
            {
                // 提取匹配到的两个浮点数
                var x = float.Parse(match.Groups[1].Value);
                var y = float.Parse(match.Groups[3].Value);

                // 返回 Vector2 对象
                return new Vector2(x, y);
            }
            else
            {
                return Vector2.zero;
            }
        }
        
        // 判断两个 DrawNodeDef 是否相等
        public static bool AreEqual(DrawNodeDef a, DrawNodeDef b)
        {
            if (ReferenceEquals(a, b)) return true; // 如果是同一个对象，直接返回 true
            if (ReferenceEquals(a, null) || ReferenceEquals(b, null)) return false; // 如果其中一个为 null，返回 false
            // 比较基本属性
            if (a.drawNodeType != b.drawNodeType ||
                a.nodeName != b.nodeName ||
                a.position != b.position ||
                Math.Abs(a.FPS - b.FPS) > 0.001f) // 浮点数比较需要考虑精度
                return false;
            // 比较 children 的数量
            if (a.children.Count != b.children.Count)
                return false;
            // 递归比较每个子节点
            for (var i = 0; i < a.children.Count; i++)
            {
                if (!AreEqual(a.children[i], b.children[i]))
                    return false;
            }

            return true;
        }
    }


}