using System;

namespace Microsoft.Msagl.Layout.Layered {
    /// <summary>
    /// This is an edge going down only one layer.
    /// It points to the original edge that can pass several layers
    /// 
    /// </summary>
#if TEST_MSAGL
    public
#else
    internal
#endif
 class LayerEdge {
        internal int Weight = 1;
        internal LayerEdge(int source, int target, int crossingWeight, int weight) {
            this.Source = source;
            this.Target = target;
            this.crossingWeight = crossingWeight;
            Weight = weight;
        }
        internal LayerEdge(int source, int target, int crossingWeight):this(source,target,crossingWeight,1) {            
        }
        int source;
        /// <summary>
        /// the source
        /// </summary>
        public int Source {
            get {
                return source;
            }
            set {
                source = value;
            }
        }

        int target;
        /// <summary>
        /// the target
        /// </summary>
        public int Target {
            get {
                return target;
            }
            set {
                target = value;
            }
        }
/// <summary>
/// overrides the equlity
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
        public override bool Equals(object obj) {
            LayerEdge ie = obj as LayerEdge;
            return ie.source == this.source && ie.target == this.target;
        }

        /// <summary>
        /// overrides GetHashCode
        /// </summary>
        /// <returns></returns>
        public override int GetHashCode() {
            uint hc = (uint)source.GetHashCode();
            return (int)((hc << 5 | hc >> 27) + (uint)target);
        }

        int crossingWeight=1;
        /// <summary>
        /// it is equalt to the number of edges this edge represents 
        /// </summary>
        public int CrossingWeight {
            get { return crossingWeight; }
//            set { crossingWeight = value; }
        }
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        public override string ToString() {
            return String.Format(System.Globalization.CultureInfo.InvariantCulture, "{0}->{1}", this.source, this.target);
        }
    }
}