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

namespace BoundaryLab.Infrastructure;

internal sealed class InventoryState(int capacity)
{
    public int Free { get; private set; } = capacity;
    public bool Allocate(int units) { if (units < 1 || units > Free) return false; Free -= units; return true; }
}
public sealed class InventoryFacade : IInventoryModule
{
    private readonly InventoryState state;
    public InventoryFacade(int capacity) { if (capacity < 0) throw new ArgumentOutOfRangeException(nameof(capacity)); state = new InventoryState(capacity); }
    public int Remaining => state.Free;
    public bool Allocate(int units) => state.Allocate(units);
}