using System.Diagnostics;
using Microsoft.Msagl.Core.Geometry;

namespace Microsoft.Msagl.Routing.Rectilinear.Nudging
{
    internal class SegWithIndex {
        internal Point[] Points;
        internal int I;//offset
    
        internal SegWithIndex(Point[] pts, int i) {
            Debug.Assert(i<pts.Length&&i>=0);
            Points = pts;
            I = i;
#if SHARPKIT //https://code.google.com/p/sharpkit/issues/detail?id=289 Support Dictionary directly based on object's GetHashCode
            UpdateHashKey();
#endif
        }

        internal Point Start {get{return Points[I];}}
        internal Point End{ get{return Points[I+1];}}
    
        override public bool Equals(object obj) {
            var other = (SegWithIndex) obj;
            return other.Points== Points&& other.I == I;
        }

        public override int GetHashCode() {
#if !SHARPKIT //https://code.google.com/p/sharpkit/issues/detail?id=372; SharpKit/Colin: unchecked is not supported
            unchecked {
#endif
                return (Points.GetHashCode() * 397) ^ I;
#if !SHARPKIT //https://code.google.com/p/sharpkit/issues/detail?id=372
            }
#endif
        }

#if SHARPKIT //https://code.google.com/p/sharpkit/issues/detail?id=289 Support Dictionary directly based on object's GetHashCode
        private SharpKit.JavaScript.JsString _hashKey;
        private void UpdateHashKey()
        {
            _hashKey = GetHashCode().ToString();
        }
#endif

    }
}