using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.UI;
namespace DongWuYiXue.DaoNiaoShu
{
    public class PointLineManager : MonoBehaviour
    {
        List<Point> points = new();
        List<Line> lines = new();
        public Line m_LinePfb;
        public RectTransform m_LineCon;
        public Color color;
        private List<Point> selectPoints = new();
        private void Start()
        {
            points = GetComponentsInChildren<Point>().ToList();
            for (int i = 0; i < points.Count; i++)
            {
                points[i].Init(this);
            }
        }
        /// <summary>
        /// 画线
        /// </summary>
        public void DrawLine(Point p)
        {
            selectPoints.Add(p);
            if (selectPoints.Count == 2 && selectPoints[0].group != selectPoints[1].group)//凑齐两点，且两点不同区域
            {
                if (TwoPointsAlreadyConnected(selectPoints))//两点之间是否已经连线
                {
                    UnselectPoints();
                    return;
                }
                if (OnePointsAlreadyConnected(selectPoints[0]) && OnePointsAlreadyConnected(selectPoints[1]))//两点是否都与第三点有连线
                {
                    if (selectPoints[0].multip && selectPoints[1].multip)
                    {
                        CreateLine(selectPoints[0], selectPoints[1]);
                    }
                    UnselectPoints();
                    return;
                }
                if (OnePointsAlreadyConnected(selectPoints[0]))//点1是否都与第三点有连线
                {
                    if (selectPoints[0].multip)
                    {
                        CreateLine(selectPoints[0], selectPoints[1]);
                    }
                    UnselectPoints();
                    return;
                }
                if (OnePointsAlreadyConnected(selectPoints[1]))//点2是否都与第三点有连线
                {
                    if (selectPoints[1].multip)
                    {
                        CreateLine(selectPoints[0], selectPoints[1]);
                    }
                    UnselectPoints();
                    return;
                }
                CreateLine(selectPoints[0], selectPoints[1]);
                UnselectPoints();
                return;
            }
            if (selectPoints.Count == 2 && selectPoints[0].group == selectPoints[1].group)//凑齐两点，且两点同一区域
            {
                UnselectPoints();
                p.Select();
                selectPoints.Add(p);
                return;
            }
        }
        /// <summary>
        /// 两点之间是否已经有连线
        /// </summary>
        public bool TwoPointsAlreadyConnected(List<Point> p)
        {
            for (int i = 0; i < lines.Count; i++)
            {
                if (lines[i].points.SequenceEqual(p))
                {
                    return true;
                }
            }
            return false;
        }
        /// <summary>
        /// 一点是否已经连线
        /// </summary>
        public bool OnePointsAlreadyConnected(Point p)
        {
            for (int i = 0; i < lines.Count; i++)
            {
                if (lines[i].points.Contains(p))
                {
                    return true;
                }
            }
            return false;
        }
        /// <summary>
        /// 取消所有点击
        /// </summary>
        public void UnselectPoints()
        {
            for (int i = 0; i < selectPoints.Count; i++)
            {
                selectPoints[i].UnSelect();
            }
            selectPoints.Clear();
        }
        /// <summary>
        /// 创建⼀条两点之间的线
        /// </summary>
        private void CreateLine(Point p1, Point p2)
        {
            //实例化需要显⽰的线段图⽚pfb
            Line line = DrawLineTool.DrawLine(p1.transform.position, p2.transform.position, color, m_LineCon).GetComponent<Line>();
            line.AddPoint(p1);
            line.AddPoint(p2);
            line.gameObject.SetActive(true);
            lines.Add(line);
        }
        /// <summary>
        /// 清除线
        /// </summary>
        public void ClearLine()
        {
            for (int i = 0; i < lines.Count; i++)
            {
                Destroy(lines[i].gameObject);
            }
            lines.Clear();
        }
        /// <summary>
        /// 判断对错
        /// </summary>
        public bool JudgeLine()
        {
            bool trueOrFalse = true;
            for (int i = 0; i < lines.Count; i++)
            {
                if (lines[i].Judge())
                {
                    lines[i].Correct();
                }
                else
                {
                    lines[i].Error();
                    trueOrFalse = false;
                }
            }
            for (int i = 0; i < points.Count; i++)
            {
                Point p = points[i];
                if (p.answers != null && !OnePointsAlreadyConnected(p))
                {
                    trueOrFalse = false;
                }
            }
            return trueOrFalse;
        }
        /// <summary>
        /// 禁用按钮
        /// </summary>
        public void ButtonForbidden()
        {
            for (int i = 0; i < points.Count; i++)
            {
                points[i].btn.interactable = false;
            }
        }
        /// <summary>
        /// 启用按钮
        /// </summary>
        public void ButtonOnEnable()
        {
            for (int i = 0; i < points.Count; i++)
            {
                points[i].btn.interactable = true;
            }
        }
    }
}