using Autodesk.Revit.DB;
using FWindSoft.SystemExtensions;
using FWindSoft.Tools;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FWindSoft.Revit.Mep
{
    /// <summary>
    /// 连接点模式判断相关函数
    /// </summary>
    public class ConnectorPatternUtils
    {
        /// <summary>
        /// 判定连接点连接模式
        /// </summary>
        /// <param name="connector1"></param>
        /// <param name="connector2"></param>
        /// <param name="connector3"></param>
        /// <param name="connectors">返回调整顺序后的连接点;T形顺序为前两个平行</param>
        /// <returns>-1：未识别；0：普通三通；1：角三通</returns>
        public static int JudgeTeePattern(Connector connector1, Connector connector2, Connector connector3, out List<Connector> connectors)
        {
            int flag = -1;
            connectors = new List<Connector>();
            //将互相垂直的放在第1，3位置。第二个位置尽量放平行相关的
            List<Connector> inputConnectors = new List<Connector>() { connector1, connector2, connector3 };
            var tuple = PermutationUtil.PermutationTraversal(inputConnectors, 3, (useConnectors) => {
                List<Connector> reConnectors = new List<Connector>();
                var innerFlag = -1;
                var dir1 = useConnectors[0].CoordinateSystem.BasisZ;
                var dir2 = useConnectors[1].CoordinateSystem.BasisZ;
                var dir3 = useConnectors[2].CoordinateSystem.BasisZ;
                if (dir1.IsVertical(dir2))
                {
                    if (dir1.IsVertical(dir3) && dir2.IsVertical(dir3))
                    {
                        reConnectors.AddRange(new Connector[] { useConnectors[0], useConnectors[1], useConnectors[2] });
                        innerFlag = 1;
                    }
                    else if (dir3.IsVertical(dir2))
                    {
                        //存在共面的连接管，放到主位置上
                        reConnectors.AddRange(new Connector[] { useConnectors[0], useConnectors[2], useConnectors[1] });
                        innerFlag = 0;
                    }
                }
                else if (dir1.IsParallel(dir2))
                {
                    //存在平行
                    reConnectors.AddRange(new Connector[] { useConnectors[0], useConnectors[1], useConnectors[2] });
                    innerFlag = 0;
                }
                if (innerFlag != -1)
                {
                    return new Tuple<int, List<Connector>>(innerFlag, reConnectors);
                }
                return null;
            });
            if (tuple != null)
            {
                flag = tuple.Item1;
                connectors = tuple.Item2;
            }
            return flag;
        }
        /// <summary>
        /// 整理成三通创建需要的Connector模式（第一个Connector和第三个Connector连接方向不能平行）
        /// </summary>
        /// <param name="connector1"></param>
        /// <param name="connector2"></param>
        /// <param name="connector3"></param>
        /// <returns></returns>
        public static List<Connector> ArrangeTeeConnectors(Connector connector1, Connector connector2, Connector connector3)
        {
            var flag = JudgeTeePattern(connector1, connector2, connector3, out List<Connector> newConnectors);
            if (flag == -1)
            {
                newConnectors.Clear();
                #region 处理非正交情况
                var baseDirection = -connector1.CoordinateSystem.BasisZ;
                var dotValue2 = Math.Abs((-connector2.CoordinateSystem.BasisZ).DotProduct(baseDirection));
                var dotValue3 = Math.Abs((-connector3.CoordinateSystem.BasisZ).DotProduct(baseDirection));
                if (dotValue2.IsEqual(dotValue3))
                {
                    //基准变成垂直的
                    newConnectors.Add(connector2);
                    newConnectors.Add(connector3);
                    newConnectors.Add(connector1);
                }
                else if (dotValue2.Less(dotValue3))
                {
                    //绝对值小，接近垂直。将垂直的放在第三个位置
                    newConnectors.Add(connector1);
                    newConnectors.Add(connector3);
                    newConnectors.Add(connector2);
                }
                else
                {
                    newConnectors.Add(connector1);
                    newConnectors.Add(connector2);
                    newConnectors.Add(connector3);
                }
                #region 过时
                //if (!connector1.CoordinateSystem.BasisZ.IsParallel(connector2.CoordinateSystem.BasisZ))
                //{
                //    newConnectors.Add(connector1);
                //    newConnectors.Add(connector3);
                //    newConnectors.Add(connector2);
                //}
                //else if (!connector1.CoordinateSystem.BasisZ.IsParallel(connector3.CoordinateSystem.BasisZ))
                //{
                //    newConnectors.Add(connector1);
                //    newConnectors.Add(connector2);
                //    newConnectors.Add(connector3);
                //}
                //else if (!connector2.CoordinateSystem.BasisZ.IsParallel(connector3.CoordinateSystem.BasisZ))
                //{
                //    newConnectors.Add(connector2);
                //    newConnectors.Add(connector1);
                //    newConnectors.Add(connector3);
                //} 
                #endregion
                #endregion
            }

            return newConnectors;
        }
    }
}