octogem/Assets/Scripts/Structures/Order.cs

using UnityEngine;
using System;
using System.Collections.Generic;

[System.Serializable]
class Order : System.Object
{
    public List<MapPosition> steps;

    public Order(MapPosition start)
    {
        steps.Add(start);
    }

    public void AddStep(MapPosition newStep)
    {
        MapPosition lastStep = steps[steps.Count - 1];
        if(!newStep.IsAdjacent(lastStep))
        {
            throw new Exception("newStep is not adjacent to the lastStep");
        }
        steps.Add(newStep);
    }

    public void CancelLastStep()
    {
        if(steps.Count < 2)
        {
            throw new Exception("Can't remove the first step");
        }
        steps.RemoveAt(steps.Count - 1);
    }
}