#include "LKH.h"
#include "Segment.h"

GainType Penalty_TRP()
{
    static Node *StartRoute = 0;
    Node *N, *NextN, *CurrentRoute;
    GainType P = 0, DistanceSum;
    int Forward = SUCC(Depot)->Id != Depot->Id + DimensionSaved;

    if (!StartRoute)
        StartRoute = Depot;
    if (StartRoute->Id > DimensionSaved)
        StartRoute -= DimensionSaved;
    N = StartRoute;
    do {
        CurrentRoute = N;
        DistanceSum = 0;
        do {
            NextN = Forward ? SUCC(N) : PREDD(N);
            if (NextN->DepotId == 0 &&
                (N->Id <= Dim || N->DepotId)) {
                DistanceSum += (C(N, NextN) - N->Pi - NextN->Pi) / Precision;
                DistanceSum += NextN->ServiceTime;
                P += DistanceSum;
                if (P > CurrentPenalty ||
                    (P == CurrentPenalty && CurrentGain <= 0)) {
                    StartRoute = CurrentRoute;
                    return CurrentPenalty + (CurrentGain > 0);
                }
                if (DistanceSum > DistanceLimit &&
                    ((P += DistanceSum - DistanceLimit) > CurrentPenalty ||
                     (P == CurrentPenalty && CurrentGain <= 0))) {
                    StartRoute = CurrentRoute;
                    return CurrentPenalty + (CurrentGain > 0);
                }
            }
            N = Forward ? SUCC(NextN) : PREDD(NextN);
        } while ((N = NextN)->DepotId == 0);
    } while (N != StartRoute);
    return P;
}

