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

namespace KDCS.UtilsGe
{
    public class Vector
    {
        private const double CrossingTolerance = 0.031;
        public XYZ Start { get; set; }
        public XYZ End { get; set; }
        public XYZ Instance { get; set; }
        public double Length { get; set; }
        public Line BoundLine { get; set; }


        public Vector(XYZ start, XYZ end, bool bZ0 = false)
        {
            if (bZ0)
            {
                Start = new XYZ(start.X, start.Y, 0.0);
                End = new XYZ(end.X, end.Y, 0.0);
            }
            else
            {
                Start = start;
                End = end;
            }
            Instance = End - Start;
            Length = Instance.GetLength();
            BoundLine = Line.CreateBound(Start, End);
        }

        public Vector(Curve curve, bool bZ0 = false)
        {
            XYZ start = curve.GetEndPoint(0);
            XYZ end = curve.GetEndPoint(1);
            if (bZ0)
            {
                Start = new XYZ(start.X, start.Y, 0.0);
                End = new XYZ(end.X, end.Y, 0.0);
            }
            else
            {
                Start = start;
                End = end;
            }
            Instance = End - Start;
            Length = Instance.GetLength();
        }


        public XYZ Intersect(Vector vector)
        {
            Line line1 = Line.CreateBound(vector.Start, vector.End);
            IntersectionResultArray intResultArray;
            BoundLine.Intersect(line1, out intResultArray);
            if (intResultArray != null)
            {
                if (intResultArray.Size > 0)
                {
                    IntersectionResult ir = intResultArray.get_Item(0);
                    if (ir.XYZPoint != null) return ir.XYZPoint;
                }
            }
            return null;
        }

        public bool IsOnVector(XYZ point, bool checkHeight = false)
        {
            return (Math.Abs((Start.DistanceTo(point) + End.DistanceTo(point)) - this.Length) <= 0.0001); // 1mm = 0.003281 ft(피트)
        }
    }
}