using System.Collections.Generic;
using System.Linq;
using IvfTl.Control.Entity.InitEntitys;

namespace ivf_tl_Control
{
    /// <summary>
    /// 启动期坏舱决策(无 I/O,纯函数,可单测)。
    /// 规则:坏舱=故障清单中已知舱号(HouseSn>0);可跑舱=发现的舱−坏舱;致命=零可跑舱。
    /// 单舱/部分舱坏绝不致命 —— 落实 spec §34。
    /// </summary>
    public static class StartupFaultPolicy
    {
        public static HashSet<int> BadHouseSns(IEnumerable<HouseFault> faults)
            => faults.Where(f => f.HouseSn > 0).Select(f => f.HouseSn).ToHashSet();

        public static List<int> RunnableHouses(IEnumerable<int> discovered, IEnumerable<HouseFault> faults)
        {
            var bad = BadHouseSns(faults);
            return discovered.Where(sn => !bad.Contains(sn)).Distinct().OrderBy(x => x).ToList();
        }

        public static bool IsFatal(IReadOnlyList<int> runnableHouses)
            => runnableHouses == null || runnableHouses.Count == 0;
    }
}