using System;
using System.Collections.Generic;
using System.Linq;
using BoundaryLab.Domain;

namespace BoundaryLab.Application;

public interface IReservationStore
{
    InventoryState Current { get; }
    bool TryCommit(InventoryState expected, InventoryState next, ReservationNotice notice);
}
public sealed class ReservationWorkflow(IReservationStore store)
{
    public bool Reserve(int units)
    {
        var before = store.Current;
        var after = before.Reserve(units);
        return after is not null && store.TryCommit(before, after, new ReservationNotice(after.Version, units));
    }
}