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

namespace FWindSoft.Revit.Mep
{
    /// <summary>
    /// 构件初始坐标接口（匹配connector的连接点）
    /// </summary>
    public interface IFittingCoordinate
    {
        /// <summary>
        /// 获取指定实例的连接点坐标
        /// </summary>
        /// <param name="fi"></param>
        /// <returns></returns>
         Tuple<XYZ, XYZ> GetCoordinate(FamilyInstance fi);
    }
    /// <summary>
    /// 连接件坐标生成工厂
    /// </summary>
    public static class FittingCoordinateFactory
    {
        /// <summary>
        /// 根据内置分类，获取相应的构件坐标
        /// </summary>
        /// <param name="builtCategory"></param>
        /// <returns></returns>
        public static IFittingCoordinate CreateFittingCoordinate(BuiltInCategory builtCategory)
        {
            if (builtCategory == BuiltInCategory.OST_ConduitFitting)
            {
                return new ConduitFittingCoordinate();
            }
            else if (builtCategory == BuiltInCategory.OST_PipeFitting)
            {
                return new PipeFittingCoordinate();
            }
            return null;
        }
        /// <summary>
        /// 获取实例的坐标体系
        /// </summary>
        /// <param name="fi"></param>
        /// <returns></returns>
        public static Tuple<XYZ, XYZ> GetCoordinate(FamilyInstance fi)
        {
            var builtCategory = fi.GetBuiltInCategory();
            var realFittingCoordinate = CreateFittingCoordinate(builtCategory);
            return realFittingCoordinate?.GetCoordinate(fi);
        }
    }
    /// <summary>
    /// 线管连接件坐标
    /// </summary>
    internal class ConduitFittingCoordinate : IFittingCoordinate
    {
        public Tuple<XYZ, XYZ> GetCoordinate(FamilyInstance fi)
        {
            return new Tuple<XYZ, XYZ>(XYZ.BasisX, XYZ.BasisY);
        }
    }
    /// <summary>
    /// 水管管连接件坐标
    /// </summary>
    internal class PipeFittingCoordinate : IFittingCoordinate
    {
        public Tuple<XYZ, XYZ> GetCoordinate(FamilyInstance fi)
        {
            var connectors = fi.GetConnectors(Domain.DomainPiping);    
            Connector primaryConnector = connectors.FirstOrDefault(c => c.GetMEPConnectorInfo().IsPrimary);
            Connector secondConnector = null;
            foreach (Connector connector in connectors)
            {
                if (connector == primaryConnector)
                {
                    continue;
                }
                if (!connector.CoordinateSystem.BasisZ.IsParallel(primaryConnector.CoordinateSystem.BasisZ))
                {
                    secondConnector = connector;
                    break;
                }
            }
            if(primaryConnector==null||secondConnector==null)
            {
                return null;
            }
            #region 特殊处理
            try
            {
                if (connectors.Count == 2)
                {
                    secondConnector.Angle = Math.PI / 2;
                }
                else if (connectors.Count == 3)
                {
                    secondConnector.Angle = Math.PI / 2;
                }
            }
            catch (Exception e)
            {
                //如果没有参照角可能会发生异常；四通设置90度有问题。设置0度是不是可以？
                //throw;
            }
            #endregion
            
            var firstDirection = primaryConnector.CoordinateSystem.BasisZ;
            var secondDirection = secondConnector.CoordinateSystem.BasisZ;
            if (!firstDirection.IsVertical(secondDirection))
            {
                var useSecond = secondDirection - secondDirection.DotProduct(firstDirection) * firstDirection;
                secondDirection = useSecond.Normalize();

            }
            return new Tuple<XYZ, XYZ>(firstDirection, secondDirection);
        }
    }
}