using System;
using System.Collections.Generic;
using HeuristicLab.Common;
using HeuristicLab.PDPSimulation.DistanceMeasures;
using HeuristicLab.PDPSimulation.DomainModel;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.PDPSimulation {
  public enum VehicleAction { Wait, Pickup, Deliver, Park, Invalid }

  [StorableClass]
  public class MoveVehicleAction : PDAction {
    [Storable]
    double sourceX;

    public double SourceX {
      get { return sourceX; }
    }

    [Storable]
    double sourceY;

    public double SourceY {
      get { return sourceY; }
    }

    [Storable]
    double targetX;

    public double TargetX {
      get { return targetX; }
    }

    [Storable]
    double targetY;

    public double TargetY {
      get { return targetY; }
    }

    [Storable]
    VehicleAction action;

    [Storable]
    Order order;

    [Storable]
    double serviceTime;

    [Storable]
    bool interruptable;

    [Storable]
    bool completed;

    [Storable]
    DistanceMeasure distMeasure;

    [Storable]
    bool diversionAllowed;

    public MoveVehicleAction(
      Guid vehicleId,
      double targetX, double targetY, VehicleAction action, Order order, bool diversionAllowed, DistanceMeasure distMeasure)
      : base(vehicleId) {
      this.targetX = targetX;
      this.targetY = targetY;
      this.action = action;
      this.order = order;
      this.serviceTime = 0;
      this.completed = false;
      this.diversionAllowed = diversionAllowed;
      this.interruptable = diversionAllowed;
      this.distMeasure = distMeasure;

      this.sourceX = -1;
      this.sourceY = -1;
    }
    [StorableConstructor]
    protected MoveVehicleAction(bool deserializing)
      : base(deserializing) {
    }
    protected MoveVehicleAction(MoveVehicleAction original, Cloner cloner)
      : base(original, cloner) {
      this.targetX = original.targetX;
      this.sourceX = original.sourceX;
      this.targetY = original.targetY;
      this.sourceY = original.sourceY;
      this.action = original.action;
      this.order = cloner.Clone<Order>(original.order);
      this.serviceTime = original.serviceTime;
      this.completed = original.completed;
      this.interruptable = original.interruptable;
      this.distMeasure = cloner.Clone<DistanceMeasure>(original.distMeasure);
      this.diversionAllowed = original.diversionAllowed;
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new MoveVehicleAction(this, cloner);
    }

    protected override bool ActionInterruptable() {
      return interruptable;
    }

    public override bool ActionCompleted() {
      return completed;
    }

    protected override double Perform(BaseObject baseObject, double simulationTime, double tickTime, List<PDChange> changes) {
      Vehicle vehicle = baseObject as Vehicle;
      lock (vehicle) {
        if ((action == VehicleAction.Pickup && (order.OrderState != OrderState.Waiting && order.OrderState != OrderState.PickingUp)) ||
            (action == VehicleAction.Deliver && ((order.ServiceRequest && order.OrderState != OrderState.Waiting && order.OrderState != OrderState.PickingUp) ||
                                                 (!order.ServiceRequest && ((order.OrderState != OrderState.PickedUp && order.OrderState != OrderState.Delivering) || !vehicle.PickedUpOrders.Contains(order.Id))))) ||
           (order != null && (order.Vehicle != Guid.Empty && order.Vehicle != vehicle.Id))) {
          if (vehicle.VehicleState != VehicleState.InvalidAction) {
            vehicle.InvalidActions++;

            vehicle.VehicleState = VehicleState.InvalidAction;
            changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
          }

          if (diversionAllowed)
            vehicle.ReadyTime = simulationTime;
          interruptable = diversionAllowed;
          completed = diversionAllowed;

          if (diversionAllowed)
            return simulationTime;
          else {
            if (order != null) {
              changes.Add(new PDChange() { ChangeType = SimulationStateChange.OrderFailed, BaseObject = order });
              order = null;
              action = VehicleAction.Invalid;
            }
          }
        }

        if (sourceX == -1) {
          sourceX = vehicle.PositionX;
          sourceY = vehicle.PositionY;
        }

        vehicle.TargetPositionX = targetX;
        vehicle.TargetPositionY = targetY;
        vehicle.CurrentAction = action;
        if (order == null)
          vehicle.CurrentOrder = Guid.Empty;
        else {
          if (!diversionAllowed)
            order.Vehicle = vehicle.Id;
          vehicle.CurrentOrder = order.Id;
          changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
        }

        if (action == VehicleAction.Wait || action == VehicleAction.Park)
          if (diversionAllowed)
            vehicle.ReadyTime = simulationTime;

        double tx, ty, length;
        distMeasure.Move(sourceX, sourceY, vehicle.PositionX, vehicle.PositionY, targetX, targetY, tickTime, vehicle.MoveInfo,
          out tx, out ty, out length);

        if (!diversionAllowed) {
          double time = simulationTime;
          time += distMeasure.GetDistance(sourceX, sourceY, vehicle.PositionX, vehicle.PositionY, targetX, targetY);
          if (action == VehicleAction.Pickup) {
            if (time < order.PickupReadyTime)
              time = order.PickupReadyTime;

            time += order.PickupServiceTime - serviceTime;
          } else if (action == VehicleAction.Deliver) {
            if (time < order.DeliveryReadyTime)
              time = order.DeliveryReadyTime;

            time += order.DeliveryServiceTime - serviceTime;
          }

          vehicle.ReadyTime = time;
        }

        vehicle.PositionX = tx;
        vehicle.PositionY = ty;

        if (length > 0) {
          vehicle.Distance += length;
          tickTime -= length;
          simulationTime += length;

          if (vehicle.VehicleState != VehicleState.Moving) {
            vehicle.VehicleState = VehicleState.Moving;
            changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
          }
          changes.Add(
            new PDChange() { ChangeType = SimulationStateChange.VehicleMoved, BaseObject = baseObject });
        }

        if (vehicle.PositionX == targetX && vehicle.PositionY == targetY) {
          if (action == VehicleAction.Pickup || (action == VehicleAction.Deliver && order.ServiceRequest)) {
            if (order.Vehicle != Guid.Empty && order.Vehicle != vehicle.Id)
              throw new Exception("Order already assigned");

            if (simulationTime < order.PickupReadyTime) {
              if (vehicle.VehicleState != VehicleState.Waiting) {
                if (diversionAllowed)
                  vehicle.ReadyTime = simulationTime;

                vehicle.VehicleState = VehicleState.Waiting;
                interruptable = diversionAllowed;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
              }

              double waitTime = Math.Min(tickTime,
                order.PickupReadyTime - simulationTime);

              simulationTime += waitTime;
              tickTime -= waitTime;
            }

            //pickup
            if (simulationTime >= order.PickupReadyTime &&
              tickTime > 0) {
              if (vehicle.VehicleState != VehicleState.Servicing) {
                if (diversionAllowed) {
                  vehicle.ReadyTime = simulationTime;
                  vehicle.ReadyTime += order.PickupServiceTime;
                }

                vehicle.VehicleState = VehicleState.Servicing;
                interruptable = false;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
              }

              if (order.OrderState != OrderState.PickingUp) {
                order.PickupTime = simulationTime;
                order.Vehicle = vehicle.Id;
                order.OrderState = OrderState.PickingUp;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.OrderState, BaseObject = order });

                if (simulationTime > order.PickupDueTime) {
                  order.Tardiness += simulationTime - order.PickupDueTime;
                }
              }

              double service = Math.Min(tickTime,
                order.PickupServiceTime - serviceTime);

              serviceTime += service;
              simulationTime += service;
              tickTime -= service;

              //load
              if (serviceTime == order.PickupServiceTime) {
                vehicle.Capacity -= order.Demand;

                if (vehicle.Capacity < 0) {
                  vehicle.Overload += -vehicle.Capacity;
                  vehicle.Capacity = 0;
                }

                vehicle.PickedUpOrders.Add(order.Id);
                order.Vehicle = vehicle.Id;
                if (order.ServiceRequest)
                  order.OrderState = OrderState.Delivered;
                else
                  order.OrderState = OrderState.PickedUp;
                vehicle.CurrentOrder = Guid.Empty;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.OrderState, BaseObject = order });

                vehicle.VehicleState = VehicleState.Waiting;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
                completed = true;
              }
            }
          } else if (action == VehicleAction.Deliver) {
            if (order.Vehicle != Guid.Empty && order.Vehicle != vehicle.Id)
              throw new Exception("Order already assigned");

            if (simulationTime < order.DeliveryReadyTime) {
              if (vehicle.VehicleState != VehicleState.Waiting) {
                if (diversionAllowed)
                  vehicle.ReadyTime = simulationTime;

                vehicle.VehicleState = VehicleState.Waiting;
                interruptable = diversionAllowed;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
              }

              double waitTime = Math.Min(tickTime,
                order.DeliveryReadyTime - simulationTime);

              simulationTime += waitTime;
              tickTime -= waitTime;
            }

            //deliver
            if (simulationTime >= order.DeliveryReadyTime &&
              tickTime > 0) {
              if (vehicle.VehicleState != VehicleState.Servicing) {
                if (diversionAllowed) {
                  vehicle.ReadyTime = simulationTime;
                  vehicle.ReadyTime += order.DeliveryServiceTime;
                }

                vehicle.VehicleState = VehicleState.Servicing;
                interruptable = false;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
              }

              if (order.OrderState != OrderState.Delivering) {
                order.DeliveryTime = simulationTime;
                order.OrderState = OrderState.Delivering;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.OrderState, BaseObject = order });

                if (simulationTime > order.DeliveryDueTime) {
                  order.Tardiness += simulationTime - order.DeliveryDueTime;
                }
              }

              double service = Math.Min(tickTime,
                order.DeliveryServiceTime - serviceTime);

              serviceTime += service;
              simulationTime += service;
              tickTime -= service;

              //load
              if (serviceTime == order.DeliveryServiceTime) {
                vehicle.Capacity += order.Demand;
                vehicle.PickedUpOrders.Remove(order.Id);
                order.OrderState = OrderState.Delivered;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.OrderState, BaseObject = order });

                vehicle.CurrentOrder = Guid.Empty;

                vehicle.VehicleState = VehicleState.Waiting;
                changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
                completed = true;
              }
            }
          } else if (action == VehicleAction.Park) {
            completed = true;

            if (vehicle.VehicleState != VehicleState.Parked) {
              vehicle.VehicleState = VehicleState.Parked;
              changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });

              if (vehicle.PositionX == vehicle.DepotX && vehicle.PositionY == vehicle.DepotY) {
                if (simulationTime > vehicle.DueTime) {
                  vehicle.Tardiness = simulationTime - vehicle.DueTime;
                }
              }
            }
          } else if (action == VehicleAction.Wait) {
            completed = true;

            if (vehicle.VehicleState != VehicleState.Waiting) {
              vehicle.VehicleState = VehicleState.Waiting;
              changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
            }
          } else if (action == VehicleAction.Invalid) {
            completed = true;

            if (vehicle.VehicleState != VehicleState.InvalidAction) {
              vehicle.VehicleState = VehicleState.InvalidAction;
              changes.Add(new PDChange() { ChangeType = SimulationStateChange.VehicleState, BaseObject = baseObject });
            }
          }
        }

        return simulationTime;
      }
    }
  }
}