package com.battery.device.api.discovery;

import java.time.Instant;
import java.util.List;
import java.util.Optional;
import com.battery.device.api.model.ChannelIdentity;
import com.battery.device.api.model.DeviceWorkStatus;
import com.battery.device.api.model.RealtimeSnapshot;

/** 保存未登记发现候选和正式设备的实时观测快照。 */
public interface DeviceDiscoveryCandidateStore
{
    /** upsert 本轮检测柜观测，未返回设备保留到逻辑过期。 */
    void recordCabinets(List<CabinetCandidate> candidates);

    /** 替换指定适配器的采集器观测，使已删除模拟采集器立即消失。 */
    void replaceCollectors(String adapterCode, List<CollectorCandidate> candidates);

    /** 删除指定适配器的全部发现候选；仅供人工重置或实机联调清理。 */
    void removeAdapter(String adapterCode);

    /** 返回指定时刻尚未过期的候选和实时状态。 */
    CandidateSnapshot snapshot(Instant now);

    /** 按设备编码查询指定时刻未过期的检测柜观测；在线和登记状态由业务层校验。 */
    default Optional<CabinetCandidate> findCabinet(String deviceCode, Instant now)
    {
        return snapshot(now).cabinets().stream().filter(item -> item.deviceCode().equals(deviceCode)).findFirst();
    }

    /** 按设备编码查询指定时刻未过期的采集器观测；在线和登记状态由业务层校验。 */
    default Optional<CollectorCandidate> findCollector(String deviceCode, Instant now)
    {
        return snapshot(now).collectors().stream().filter(item -> item.deviceCode().equals(deviceCode)).findFirst();
    }

    record CandidateSnapshot(List<CabinetCandidate> cabinets, List<CollectorCandidate> collectors)
    {
        public CandidateSnapshot
        {
            cabinets = List.copyOf(cabinets);
            collectors = List.copyOf(collectors);
        }
    }

    /**
     * 未登记的候选设备。{@code lastDataAt} 取该设备各通道最近的采样行时间，
     * 供操作员判断哪几台设备现在真的在产出数据；它不改变候选的取舍，登记范围由操作员决定。
     */
    record CabinetCandidate(String adapterCode, Long adapterId, String deviceCode, int devtype, int devid,
            String ip, String mac, String name, String manufacturer, String model,
            List<ChannelCandidate> channels, Instant observedAt, Instant expiresAt, Instant lastDataAt)
    {
        public CabinetCandidate { channels = List.copyOf(channels); }
        public boolean online() { return channels.stream().anyMatch(ChannelCandidate::online); }

        /** 兼容不含最近数据时间的既有候选。 */
        public CabinetCandidate(String adapterCode, Long adapterId, String deviceCode, int devtype, int devid,
                String ip, String mac, String name, String manufacturer, String model,
                List<ChannelCandidate> channels, Instant observedAt, Instant expiresAt)
        {
            this(adapterCode, adapterId, deviceCode, devtype, devid, ip, mac, name, manufacturer, model,
                    channels, observedAt, expiresAt, null);
        }
    }

    /** 通道候选；{@code lastDataAt} 是该通道来源里最近一次采样行的设备时间。 */
    record ChannelCandidate(ChannelIdentity identity, boolean online, DeviceWorkStatus workStatus,
            Instant observedAt, RealtimeSnapshot latestSnapshot, Instant lastDataAt)
    {
        /** 兼容仅有状态的旧发现候选。 */
        public ChannelCandidate(ChannelIdentity identity, boolean online, DeviceWorkStatus workStatus,
                Instant observedAt)
        {
            this(identity, online, workStatus, observedAt, null, null);
        }

        /** 兼容不含最近数据时间的既有候选。 */
        public ChannelCandidate(ChannelIdentity identity, boolean online, DeviceWorkStatus workStatus,
                Instant observedAt, RealtimeSnapshot latestSnapshot)
        {
            this(identity, online, workStatus, observedAt, latestSnapshot, null);
        }
    }

    record CollectorCandidate(String adapterCode, String deviceCode, String ip, String mac, String name,
            String manufacturer, String model, int channelCount, boolean online,
            Instant observedAt, Instant expiresAt) { }
}