package com.battery.device.simulator;

import java.math.BigDecimal;
import java.time.Instant;
import java.util.List;
import com.battery.device.model.DeviceWorkStatus;

/** 持久化开发模拟器配置；实现必须在返回前确认写入成功。 */
public interface BtsSimulatorStateStore
{
    int CURRENT_VERSION = 1;
    int MAX_HISTORY_BATCH_SIZE = 1000;
    /** 开发演示只保留有限历史，避免 Redis 随运行时间无限增长。 */
    long MAX_HISTORY_RECORDS = 20_000L;

    /** 读取已有状态；仅在状态不存在时原子写入并返回默认状态。 */
    SimulatorState loadOrInitialize(SimulatorState defaultState);

    /** 开发模拟器启动时清理上一轮演示历史；正式业务存储不需要实现该动作。 */
    default SimulatorState resetHistoryForDemoStartup(SimulatorState state) { return state; }

    /** 完整保存下一版模拟器状态。 */
    void save(SimulatorState state);

    /** 状态和独立历史全部校验通过后，提交兼容旧格式所需的迁移。 */
    default void completeValidatedRestore(SimulatorState state) { }

    /** 原子保存主状态并追加本轮新产生的原始历史。 */
    default void save(SimulatorState state, List<CollectorHistoryAppend> historyAppends)
    {
        if (!historyAppends.isEmpty())
            throw new UnsupportedOperationException("Collector history append is not supported");
        save(state);
    }

    /** 按原始写入顺序或反向顺序读取有界历史批次。 */
    default CollectorHistoryBatch loadCollectorHistoryPage(String collectorCode, long offset, int limit,
            boolean reverse)
    {
        if (offset < 0) throw new IllegalArgumentException("offset must not be negative");
        if (limit < 1 || limit > MAX_HISTORY_BATCH_SIZE)
            throw new IllegalArgumentException("limit must be between 1 and " + MAX_HISTORY_BATCH_SIZE);
        return new CollectorHistoryBatch(offset, 0, false, 0, List.of());
    }

    /** 读取检测柜模拟历史；正式适配器不依赖该演示扩展。 */
    default BtsHistoryBatch loadBtsHistoryPage(String historyKey, long offset, int limit)
    {
        return new BtsHistoryBatch(offset, 0, false, 0, List.of());
    }

    /** 追加检测柜模拟历史，供重启续采合同使用。 */
    default void appendBtsHistory(String historyKey, BtsHistoryRecord record) { }

    /** 读取检测柜通道的播放状态；实现可在不支持播放持久化时返回 null。 */
    default BtsPlaybackState loadBtsPlaybackState(String historyKey) { return null; }

    /** 保存检测柜通道的播放状态。 */
    default void saveBtsPlaybackState(String historyKey, BtsPlaybackState state) { }

    /** 删除检测柜通道的播放状态。 */
    default void deleteBtsPlaybackState(String historyKey) { }

    /** 删除检测柜通道的持久化历史和对应索引。 */
    default void deleteBtsHistory(String historyKey) { }

    /** 原子提交检测柜新增历史与推进后的播放状态。 */
    default void saveBtsPlaybackAndAppendHistory(String historyKey, BtsPlaybackState state,
            List<BtsHistoryRecord> records)
    {
        for (BtsHistoryRecord record : records) appendBtsHistory(historyKey, record);
        saveBtsPlaybackState(historyKey, state);
    }

    /** 原子保存删除采集器后的主状态，并删除该采集器的独立历史。 */
    default void saveAndDeleteCollectorHistory(SimulatorState state, String collectorCode)
    {
        throw new UnsupportedOperationException("Atomic collector deletion is not supported");
    }

    /** 读取短期保留的最近请求。 */
    List<RecentRequest> loadRecentRequests();

    /** 保存短期保留的最近请求。 */
    void saveRecentRequests(List<RecentRequest> requests);

    /** 人工重置主状态和最近请求。 */
    void reset(SimulatorState defaultState);

    record SimulatorState(int version, List<DeviceState> devices, List<CollectorState> collectors,
            int nextDeviceId, int nextCollectorId, List<ChannelTombstone> tombstones)
    {
        public SimulatorState
        {
            if (version != CURRENT_VERSION)
                throw new IllegalStateException("Unsupported BTS simulator state version: " + version);
            devices = List.copyOf(devices);
            collectors = List.copyOf(collectors);
            tombstones = List.copyOf(tombstones);
        }
    }

    record DeviceState(int deviceId, String ip, boolean online, List<ChannelState> channels,
            BtsDeviceProfile profile)
    {
        public DeviceState
        {
            channels = List.copyOf(channels);
            profile = profile == null ? BtsDeviceProfile.virtual(channels.size()) : profile;
        }

        /** 兼容旧版只保存拓扑和通道状态的模拟设备。 */
        public DeviceState(int deviceId, String ip, boolean online, List<ChannelState> channels)
        {
            this(deviceId, ip, online, channels, BtsDeviceProfile.virtual(channels.size()));
        }
    }

    record CollectorState(int collectorId, String deviceCode, String ip, String mac, String name,
            String manufacturer, String model, int channelCount, boolean online, int sampleIntervalMs,
            long nextSequence, Instant lastSampledAt, List<CollectorChannelState> channels,
            List<CollectorRealtimeMeasurement> latestMeasurements,
            long historyRecordCount, CollectorHistoryFaults historyFaults)
    {
        public CollectorState
        {
            channels = List.copyOf(channels);
            latestMeasurements = List.copyOf(latestMeasurements);
            historyFaults = historyFaults == null ? CollectorHistoryFaults.none() : historyFaults;
        }

        /** 兼容只包含发现配置的旧模拟状态；Redis 读取边界会补齐采样合同。 */
        public CollectorState(int collectorId, String deviceCode, String ip, String mac, String name,
                String manufacturer, String model, int channelCount, boolean online)
        {
            this(collectorId, deviceCode, ip, mac, name, manufacturer, model, channelCount, online,
                    DevelopmentCollectorSimulation.DEFAULT_SAMPLE_INTERVAL_MS, 1L, null,
                    DevelopmentCollectorSimulation.defaultChannels(channelCount), List.of(), 0L,
                    CollectorHistoryFaults.none());
        }
    }

    record CollectorChannelState(String channelCode, List<CollectorMetricState> metrics)
    {
        public CollectorChannelState { metrics = List.copyOf(metrics); }
    }

    record CollectorMetricState(String metricCode, BigDecimal value, String unit) { }

    record CollectorRealtimeMeasurement(String adapterCode, String collectorCode, String channelCode,
            long sequenceId, Instant deviceTime, String deviceTimeRaw, Instant serverReceivedAt,
            String metricCode, BigDecimal value, String unit) { }

    record CollectorMeasurementRecord(String adapterCode, String collectorCode, String channelCode,
            long sequenceId, Instant deviceTime, String deviceTimeRaw, Instant serverReceivedAt,
            String metricCode, BigDecimal value, String unit) { }

    record CollectorHistoryAppend(String collectorCode, List<CollectorMeasurementRecord> records)
    {
        public CollectorHistoryAppend { records = List.copyOf(records); }
    }

    record CollectorHistoryBatch(long offset, long nextOffset, boolean hasMore, long total,
            List<CollectorMeasurementRecord> records)
    {
        public CollectorHistoryBatch { records = List.copyOf(records); }
    }

    record BtsHistoryRecord(long sequenceId, Instant deviceTime, double currentA, double voltageV,
            double capacityAh, double energyWh, int cycleNo, int stepNo, String stepName, String stepType)
    {
        /** 兼容 Ticket13 之前仅包含核心测量值的历史记录。 */
        public BtsHistoryRecord(long sequenceId, Instant deviceTime, double currentA, double voltageV,
                double capacityAh, double energyWh)
        {
            this(sequenceId, deviceTime, currentA, voltageV, capacityAh, energyWh, 1, 1, "恒流充电", "cc");
        }
    }

    /** 检测柜单通道演示播放状态；与测试的接收状态相互独立。 */
    record BtsPlaybackState(boolean playing, int speedMultiplier, int cycleNo, int stepNo,
            String stepName, String stepType, Instant simulatedAt, Instant wallClockAt,
            long nextSequence, boolean naturallyFinished)
    {
        public BtsPlaybackState
        {
            if (speedMultiplier != 1 && speedMultiplier != 60 && speedMultiplier != 600)
                throw new IllegalArgumentException("speedMultiplier must be 1, 60 or 600");
            if (cycleNo < 1 || stepNo < 1 || nextSequence < 1 || stepName == null || stepName.isBlank()
                    || stepType == null || stepType.isBlank())
                throw new IllegalArgumentException("Invalid BTS playback state");
        }
    }

    record BtsHistoryBatch(long offset, long nextOffset, boolean hasMore, long total,
            List<BtsHistoryRecord> records)
    {
        public BtsHistoryBatch { records = List.copyOf(records); }
    }

    record CollectorHistoryFaults(List<Long> missingSequences, Long duplicateSequence,
            Long conflictingSequence, boolean outOfOrder)
    {
        public CollectorHistoryFaults
        {
            missingSequences = missingSequences == null ? List.of() : List.copyOf(missingSequences);
        }

        public static CollectorHistoryFaults none()
        {
            return new CollectorHistoryFaults(List.of(), null, null, false);
        }
    }

    record ChannelState(int channelId, boolean online, DeviceWorkStatus workStatus) { }

    /** BTS 检测柜的可配置厂商 profile；参数用于发现展示和边界内的演示数据生成。 */
    record BtsDeviceProfile(int devtype, int subDeviceId, String name, String manufacturer, String model,
            String serialNumber, String firmwareVersion, int channelCount, BigDecimal currentMinA,
            BigDecimal currentMaxA, BigDecimal voltageMinV, BigDecimal voltageMaxV, int sampleIntervalMs)
    {
        public BtsDeviceProfile
        {
            if (devtype < 0 || subDeviceId < 0 || channelCount < 1 || sampleIntervalMs < 1)
                throw new IllegalArgumentException("Invalid BTS device profile limits");
            if (name == null || name.isBlank() || manufacturer == null || manufacturer.isBlank()
                    || model == null || model.isBlank() || serialNumber == null || serialNumber.isBlank()
                    || firmwareVersion == null || firmwareVersion.isBlank())
                throw new IllegalArgumentException("BTS device profile metadata must not be blank");
            if (currentMinA == null || currentMaxA == null || voltageMinV == null || voltageMaxV == null
                    || currentMinA.compareTo(currentMaxA) > 0 || voltageMinV.compareTo(voltageMaxV) > 0)
                throw new IllegalArgumentException("Invalid BTS device profile ranges");
        }

        public static BtsDeviceProfile virtual(int channelCount)
        {
            return new BtsDeviceProfile(22, 1, "dev-sim 设备", "开发模拟器", "BTS Virtual Cabinet",
                    "SIM-VIRTUAL", "dev-sim", channelCount, new BigDecimal("-6.000"),
                    new BigDecimal("6.000"), BigDecimal.ZERO, new BigDecimal("5.000"), 100);
        }
    }

    record ChannelTombstone(int deviceId, String ip, int channelId, int remainingDiscoveries) { }

    record RecentRequest(Instant receivedAt, String command, String request) { }
}