package com.mes.interaction.workstation.transfer.handler;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.mes.device.entity.DeviceConfig;
import com.mes.device.entity.GlassInfo;
import com.mes.device.mapper.DeviceGlassInfoMapper;
import com.mes.device.service.DevicePlcOperationService;
import com.mes.device.service.GlassInfoService;
import com.mes.device.vo.DevicePlcVO;
import com.mes.interaction.workstation.base.WorkstationBaseHandler;
import com.mes.interaction.workstation.config.WorkstationLogicConfig;
import com.mes.s7.enhanced.EnhancedS7Serializer;
import com.mes.s7.provider.S7SerializerProvider;
import com.mes.service.PlcDynamicDataService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Component;

import javax.annotation.PreDestroy;
import java.time.LocalDateTime;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicLong;
import java.util.stream.Collectors;

/**
 * 卧转立主体设备逻辑处理器
 * 负责玻璃缓冲、容量校验、批次组装、PLC写入等逻辑
 */
@Slf4j
@Component
public class HorizontalTransferLogicHandler extends WorkstationBaseHandler {

    private final PlcDynamicDataService plcDynamicDataService;
    private final GlassInfoService glassInfoService;
    private final S7SerializerProvider s7SerializerProvider;
    
    @Autowired(required = false)
    private DeviceGlassInfoMapper glassInfoMapper;

    // 玻璃缓冲队列：deviceId -> 玻璃信息列表
    private final Map<String, List<GlassBufferItem>> glassBuffer = new ConcurrentHashMap<>();
    
    // 最后扫码时间：deviceId -> 最后扫码时间戳
    private final Map<String, AtomicLong> lastScanTime = new ConcurrentHashMap<>();
    
    // 监控任务：deviceId -> 监控任务
    private final Map<String, ScheduledFuture<?>> monitorTasks = new ConcurrentHashMap<>();
    
    // 监控线程池
    private final ScheduledExecutorService monitorExecutor = Executors.newScheduledThreadPool(5, r -> {
        Thread t = new Thread(r, "HorizontalTransferMonitor");
        t.setDaemon(true);
        return t;
    });

    @Autowired
    public HorizontalTransferLogicHandler(DevicePlcOperationService devicePlcOperationService,
                                         PlcDynamicDataService plcDynamicDataService,
                                         @Qualifier("deviceGlassInfoService") GlassInfoService glassInfoService,
                                         S7SerializerProvider s7SerializerProvider) {
        super(devicePlcOperationService);
        this.plcDynamicDataService = plcDynamicDataService;
        this.glassInfoService = glassInfoService;
        this.s7SerializerProvider = s7SerializerProvider;
    }

    @Override
    public String getDeviceType() {
        return DeviceConfig.DeviceType.WORKSTATION_TRANSFER;
    }

    @Override
    protected DevicePlcVO.OperationResult doExecute(DeviceConfig deviceConfig,
                                                    String operation,
                                                    Map<String, Object> params,
                                                    Map<String, Object> logicParams) {
        WorkstationLogicConfig config = parseWorkstationConfig(logicParams);
        
        try {
            switch (operation) {
                case "checkAndProcess":
                case "process":
                    // 这里必须把 params 传进去，以便在多设备任务流程中
                    // 能够通过 _taskContext 将卧转立输出的玻璃ID写入任务上下文
                    return handleCheckAndProcess(deviceConfig, config, logicParams, params);
                case "startMonitor":
                    return handleStartMonitor(deviceConfig, config, logicParams);
                case "stopMonitor":
                    return handleStopMonitor(deviceConfig);
                case "clearBuffer":
                    return handleClearBuffer(deviceConfig);
                case "clearPlc":
                    return handleClearPlc(deviceConfig);
                default:
                    return buildResult(deviceConfig, operation, false, 
                            "不支持的操作: " + operation);
            }
        } catch (Exception e) {
            log.error("卧转立主体处理异常: deviceId={}, operation={}", 
                    deviceConfig.getId(), operation, e);
            return buildResult(deviceConfig, operation, false, 
                    "处理异常: " + e.getMessage());
        }
    }

    /**
     * 检查并处理玻璃批次
     * 从数据库读取最近扫码的玻璃，进行容量判断，组装批次，写入PLC
     */
    private DevicePlcVO.OperationResult handleCheckAndProcess(
            DeviceConfig deviceConfig,
            WorkstationLogicConfig config,
            Map<String, Object> logicParams,
            Map<String, Object> params) {
        
        String deviceId = deviceConfig.getDeviceId();
        EnhancedS7Serializer serializer = s7SerializerProvider.getSerializer(deviceConfig);
        if (serializer == null) {
            return buildResult(deviceConfig, "checkAndProcess", false, 
                    "获取PLC序列化器失败");
        }

        try {
            // 1. 从数据库查询最近扫码的玻璃信息（最近1分钟内的记录）
            List<GlassInfo> recentGlasses = queryRecentScannedGlasses(deviceConfig, logicParams);
            boolean hasNewGlass = false;
            
            if (!recentGlasses.isEmpty()) {
                log.info("查询到最近扫码的玻璃: deviceId={}, count={}", 
                        deviceId, recentGlasses.size());
                
                // 2. 更新缓冲队列；仅在有“新玻璃”加入缓冲时才更新最后扫码时间
                hasNewGlass = updateBuffer(deviceId, recentGlasses);
                if (hasNewGlass) {
                    lastScanTime
                            .computeIfAbsent(deviceId, k -> new AtomicLong())
                            .set(System.currentTimeMillis());
                }
            } else {
                log.debug("未查询到最近扫码的玻璃: deviceId={}", deviceId);
            }

            // 3. 检查缓冲队列（即使查询不到新玻璃，缓冲中可能还有待处理的玻璃）
            List<GlassBufferItem> buffer = glassBuffer.get(deviceId);
            if (buffer == null || buffer.isEmpty()) {
                // 缓冲为空且无新玻璃，返回空状态
                return buildResult(deviceConfig, "checkAndProcess", true, 
                        "缓冲队列为空，无待处理玻璃");
            }

            // 4. 判断是否满足处理条件
            boolean shouldProcess = shouldProcessBatch(deviceId, buffer, config);
            if (!shouldProcess) {
                // 未满足处理条件：构造带有等待进度的提示信息，便于前端展示
                String waitMessage;
                AtomicLong lastTime = lastScanTime.get(deviceId);
                Integer delayMs = config.getTransferDelayMs();
                if (lastTime != null && delayMs != null && delayMs > 0) {
                    long elapsedMs = System.currentTimeMillis() - lastTime.get();
                    if (elapsedMs < 0) {
                        elapsedMs = 0;
                    }
                    long totalMs = delayMs;
                    long elapsedSec = elapsedMs / 1000;
                    long totalSec = totalMs / 1000;
                    waitMessage = String.format("等待更多玻璃或超时触发批次处理 (已等待 %d/%d 秒)",
                            elapsedSec, totalSec);
                } else {
                    // 没有有效的最后扫码时间或配置，退回到固定提示
                    waitMessage = "等待更多玻璃或30s超时";
                }
                return buildResult(deviceConfig, "checkAndProcess", true, waitMessage);
            }

            // 5. 容量判断和批次组装（考虑玻璃间隙）
            Integer glassGap = getLogicParam(logicParams, "glassGap", 200); // 玻璃之间的物理间隔（mm），默认200mm
            List<GlassInfo> batch = assembleBatch(buffer, config.getVehicleCapacity(), glassGap);
            if (batch.isEmpty()) {
                return buildResult(deviceConfig, "checkAndProcess", false, 
                        "无法组装有效批次（容量不足）");
            }

            // 6. 写入PLC（尝试从任务参数中获取卧转立编号）
            DevicePlcVO.OperationResult writeResult = writeBatchToPlc(
                    deviceConfig, batch, serializer, logicParams, params);
            
            if (!Boolean.TRUE.equals(writeResult.getSuccess())) {
                return writeResult;
            }

            // 卧转立批次已成功写入PLC，将本批次玻璃ID写入任务上下文，供大车进片使用
            try {
                if (params != null) {
                    Object ctxObj = params.get("_taskContext");
                    if (ctxObj instanceof com.mes.task.model.TaskExecutionContext) {
                        com.mes.task.model.TaskExecutionContext ctx =
                                (com.mes.task.model.TaskExecutionContext) ctxObj;
                        List<String> batchGlassIds = batch.stream()
                                .map(GlassInfo::getGlassId)
                                .filter(Objects::nonNull)
                                .collect(Collectors.toList());
                        if (!batchGlassIds.isEmpty()) {
                            ctx.getSharedData().put("transferReadyGlassIds",
                                    new java.util.ArrayList<>(batchGlassIds));
                            log.info("卧转立已输出批次玻璃到任务上下文: deviceId={}, glassIds={}",
                                    deviceConfig.getId(), batchGlassIds);
                        }
                    }
                }
            } catch (Exception e) {
                log.warn("卧转立写入任务上下文transferReadyGlassIds失败: deviceId={}", deviceConfig.getId(), e);
            }

            // 7. 从缓冲队列中移除已处理的玻璃并更新状态
            removeProcessedGlasses(deviceId, batch);
            glassInfoService.updateGlassStatus(
                    batch.stream().map(GlassInfo::getGlassId).collect(Collectors.toList()),
                    GlassInfo.Status.PROCESSED);

            // 8. 检查缓冲是否为空，如果为空且无新玻璃，标记为完成
            List<GlassBufferItem> remainingBuffer = glassBuffer.get(deviceId);
            boolean bufferEmpty = remainingBuffer == null || remainingBuffer.isEmpty();
            boolean noNewGlass = !hasNewGlass;
            
            String msg;
            if (bufferEmpty && noNewGlass) {
                // 缓冲已清空且无新玻璃，任务完成
                msg = String.format("批次已写入PLC: glassCount=%d, glassIds=%s, 缓冲已清空，任务完成", 
                        batch.size(), 
                        batch.stream().map(GlassInfo::getGlassId).collect(Collectors.joining(",")));
            } else {
                // 缓冲还有玻璃或可能有新玻璃，继续运行
                msg = String.format("批次已写入PLC: glassCount=%d, glassIds=%s", 
                        batch.size(), 
                        batch.stream().map(GlassInfo::getGlassId).collect(Collectors.joining(",")));
            }
            return buildResult(deviceConfig, "checkAndProcess", true, msg);

        } catch (Exception e) {
            log.error("检查并处理玻璃批次异常: deviceId={}", deviceId, e);
            return buildResult(deviceConfig, "checkAndProcess", false, 
                    "处理异常: " + e.getMessage());
        }
    }

    /**
     * 查询最近扫码的玻璃信息
     */
    private List<GlassInfo> queryRecentScannedGlasses(
            DeviceConfig deviceConfig,
            Map<String, Object> logicParams) {
        
        if (glassInfoMapper == null) {
            log.warn("GlassInfoMapper未注入，无法查询最近扫码的玻璃");
            return Collections.emptyList();
        }
        
        try {
            // 从配置中获取workLine，用于过滤（配置中是Integer类型）
            Integer workLine = getLogicParam(logicParams, "workLine", null);
            
            // 查询state=1的玻璃记录（已扫码交互完成，等待卧转立处理）
            LambdaQueryWrapper<GlassInfo> wrapper = new LambdaQueryWrapper<>();
            wrapper.in(GlassInfo::getStatus, GlassInfo.Status.PENDING, GlassInfo.Status.ACTIVE)
                   .eq(GlassInfo::getState, 1) // 只查询state=1的玻璃（已扫码完成）
                   .orderByDesc(GlassInfo::getCreatedTime)
                   .last("LIMIT 20"); // 限制查询数量，避免过多
            
            // 如果配置了workLine，则过滤work_line字段
            if (workLine != null) {
                wrapper.eq(GlassInfo::getWorkLine, workLine);
            }
            
            List<GlassInfo> recentGlasses = glassInfoMapper.selectList(wrapper);
            
            log.debug("查询到最近扫码的玻璃: deviceId={}, workLine={}, count={}", 
                    deviceConfig.getId(), workLine, recentGlasses.size());
            
            return recentGlasses;
            
        } catch (Exception e) {
            log.error("查询最近扫码的玻璃信息异常: deviceId={}", 
                    deviceConfig.getId(), e);
            return Collections.emptyList();
        }
    }

    /**
     * 更新缓冲队列
     * @return 是否有新的玻璃被加入缓冲（用于判断是否刷新 lastScanTime）
     */
    private boolean updateBuffer(String deviceId, List<GlassInfo> newGlasses) {
        List<GlassBufferItem> buffer = glassBuffer.computeIfAbsent(
                deviceId, k -> new CopyOnWriteArrayList<>());
        
        Set<String> existingIds = buffer.stream()
                .map(item -> item.glassInfo.getGlassId())
                .collect(Collectors.toSet());
        
        boolean hasNewGlass = false;
        for (GlassInfo glass : newGlasses) {
            if (!existingIds.contains(glass.getGlassId())) {
                buffer.add(new GlassBufferItem(glass, System.currentTimeMillis()));
                hasNewGlass = true;
                log.debug("添加玻璃到缓冲队列: deviceId={}, glassId={}", 
                        deviceId, glass.getGlassId());
            }
        }
        return hasNewGlass;
    }

    /**
     * 判断是否应该处理批次
     * 注意：这里只做粗略判断，精确的容量计算（含间隙）在assembleBatch中完成
     */
    private boolean shouldProcessBatch(String deviceId, 
                                      List<GlassBufferItem> buffer,
                                      WorkstationLogicConfig config) {
        // 条件1：缓冲队列已满（达到容量限制）
        // 粗略计算：所有玻璃长度之和（不考虑间隙，因为间隙是动态的）
        int totalLength = buffer.stream()
                .mapToInt(item -> item.glassInfo.getGlassLength() != null ? 
                        item.glassInfo.getGlassLength() : 0)
                .sum();
        // 粗略判断：如果总长度接近容量（留一些余量给间隙），就触发处理
        // 精确判断会在assembleBatch中完成
        if (totalLength >= config.getVehicleCapacity() * 0.8) { // 80%阈值，留余量给间隙
            log.info("缓冲队列容量接近满载，触发批次处理: deviceId={}, totalLength={}, capacity={}", 
                    deviceId, totalLength, config.getVehicleCapacity());
            return true;
        }

        // 条件2：30s内无新玻璃扫码
        AtomicLong lastTime = lastScanTime.get(deviceId);
        if (lastTime != null) {
            long elapsed = System.currentTimeMillis() - lastTime.get();
            if (elapsed >= config.getTransferDelayMs()) {
                log.info("30s内无新玻璃扫码，触发批次处理: deviceId={}, elapsed={}ms", 
                        deviceId, elapsed);
                return true;
            }
        }

        return false;
    }

    /**
     * 组装批次（容量判断，考虑玻璃间隙）
     * @param buffer 缓冲队列
     * @param vehicleCapacity 车辆容量（mm）
     * @param glassGap 玻璃之间的物理间隔（mm），默认200mm
     * @return 组装好的批次列表
     */
    private List<GlassInfo> assembleBatch(List<GlassBufferItem> buffer, 
                                          int vehicleCapacity,
                                          int glassGap) {
        List<GlassInfo> batch = new ArrayList<>();
        int usedLength = 0;
        int gap = Math.max(glassGap, 0); // 确保间隔不为负数
        
        for (GlassBufferItem item : buffer) {
            GlassInfo glass = item.glassInfo;
            int glassLength = glass.getGlassLength() != null ? 
                    glass.getGlassLength() : 0;
            
            if (glassLength <= 0) {
                continue; // 跳过无效长度的玻璃
            }
            
            if (batch.isEmpty()) {
                // 第一块玻璃，不需要间隙
                if (glassLength <= vehicleCapacity && batch.size() < 6) {
                    batch.add(glass);
                    usedLength = glassLength;
                } else {
                    break; // 第一块就装不下
                }
            } else {
                // 后续玻璃需要考虑间隙：玻璃长度 + 间隙
                int requiredLength = glassLength + gap;
                if (usedLength + requiredLength <= vehicleCapacity && batch.size() < 6) {
                    batch.add(glass);
                    usedLength += requiredLength; // 包含间隙
                } else {
                    break; // 装不下了
                }
            }
        }
        
        log.debug("批次组装完成: batchSize={}, usedLength={}, capacity={}, glassGap={}", 
                batch.size(), usedLength, vehicleCapacity, gap);
        
        return batch;
    }

    /**
     * 写入批次到PLC
     */
    private DevicePlcVO.OperationResult writeBatchToPlc(
            DeviceConfig deviceConfig,
            List<GlassInfo> batch,
            EnhancedS7Serializer serializer,
            Map<String, Object> logicParams,
            Map<String, Object> params) {
        
        Map<String, Object> payload = new HashMap<>();
        
        // 写入玻璃ID（最多6个）
        int count = Math.min(batch.size(), 6);
        for (int i = 0; i < count; i++) {
            String fieldName = "plcGlassId" + (i + 1);
            payload.put(fieldName, batch.get(i).getGlassId());
        }
        
        // 写入玻璃数量
        payload.put("plcGlassCount", count);
        
        // 写入卧转立编号（优先从任务参数获取，其次从设备配置获取，直接写入编号，不进行位置映射）
        Object inPosition = null;
        if (params != null) {
            try {
                Object ctxObj = params.get("_taskContext");
                if (ctxObj instanceof com.mes.task.model.TaskExecutionContext) {
                    com.mes.task.model.TaskExecutionContext ctx =
                            (com.mes.task.model.TaskExecutionContext) ctxObj;
                    inPosition = ctx.getParameters().getExtra() != null 
                            ? ctx.getParameters().getExtra().get("inPosition") : null;
                }
            } catch (Exception e) {
                log.debug("从任务参数获取卧转立编号失败: deviceId={}", deviceConfig.getId(), e);
            }
        }
        // 如果任务参数中没有，从设备配置中获取
        if (inPosition == null) {
            inPosition = getLogicParam(logicParams, "inPosition", null);
        }
        if (inPosition != null) {
            // 直接写入编号本身，不进行位置映射转换
            payload.put("inPosition", inPosition);
            log.info("写入卧转立编号: deviceId={}, inPosition={}", deviceConfig.getId(), inPosition);
        } else {
            log.debug("未配置卧转立编号，跳过写入: deviceId={}", deviceConfig.getId());
        }
        
        // 写入请求字（触发大车）
        payload.put("plcRequest", 1);
        
        try {
            plcDynamicDataService.writePlcData(deviceConfig, payload, serializer);
            log.info("批次已写入PLC: deviceId={}, glassCount={}, inPosition={}", 
                    deviceConfig.getId(), count, inPosition);
            return buildResult(deviceConfig, "writeBatchToPlc", true, 
                    "批次写入成功");
        } catch (Exception e) {
            log.error("写入批次到PLC失败: deviceId={}", deviceConfig.getId(), e);
            return buildResult(deviceConfig, "writeBatchToPlc", false, 
                    "写入失败: " + e.getMessage());
        }
    }

    /**
     * 从缓冲队列移除已处理的玻璃
     */
    private void removeProcessedGlasses(String deviceId, List<GlassInfo> processed) {
        List<GlassBufferItem> buffer = glassBuffer.get(deviceId);
        if (buffer == null) {
            return;
        }
        
        Set<String> processedIds = processed.stream()
                .map(GlassInfo::getGlassId)
                .collect(Collectors.toSet());
        
        buffer.removeIf(item -> processedIds.contains(item.glassInfo.getGlassId()));
    }

    /**
     * 启动监控任务（定期检查并处理）
     */
    private DevicePlcVO.OperationResult handleStartMonitor(
            DeviceConfig deviceConfig,
            WorkstationLogicConfig config,
            Map<String, Object> logicParams) {
        
        String deviceId = deviceConfig.getDeviceId();
        
        // 停止旧的监控任务
        handleStopMonitor(deviceConfig);
        
        // 获取监控间隔
        Integer monitorIntervalMs = getLogicParam(logicParams, "monitorIntervalMs", 
                config.getScanIntervalMs());
        
        // 启动监控任务
        ScheduledFuture<?> future = monitorExecutor.scheduleWithFixedDelay(() -> {
            try {
                // 监控任务不在多设备任务上下文中运行，这里不需要传入 params/_taskContext
                handleCheckAndProcess(deviceConfig, config, logicParams, null);
            } catch (Exception e) {
                log.error("监控任务执行异常: deviceId={}", deviceId, e);
            }
        }, monitorIntervalMs, monitorIntervalMs, TimeUnit.MILLISECONDS);
        
        monitorTasks.put(deviceId, future);
        log.info("已启动卧转立监控任务: deviceId={}, interval={}ms", 
                deviceId, monitorIntervalMs);
        
        return buildResult(deviceConfig, "startMonitor", true, 
                "监控任务已启动");
    }

    /**
     * 停止监控任务
     */
    private DevicePlcVO.OperationResult handleStopMonitor(DeviceConfig deviceConfig) {
        String deviceId = deviceConfig.getDeviceId();
        ScheduledFuture<?> future = monitorTasks.remove(deviceId);
        if (future != null && !future.isCancelled()) {
            future.cancel(false);
            log.info("已停止卧转立监控任务: deviceId={}", deviceId);
        }
        return buildResult(deviceConfig, "stopMonitor", true, "监控任务已停止");
    }

    /**
     * 清空缓冲队列
     */
    private DevicePlcVO.OperationResult handleClearBuffer(DeviceConfig deviceConfig) {
        String deviceId = deviceConfig.getDeviceId();
        glassBuffer.remove(deviceId);
        lastScanTime.remove(deviceId);
        log.info("已清空缓冲队列: deviceId={}", deviceId);
        return buildResult(deviceConfig, "clearBuffer", true, "缓冲队列已清空");
    }
    
    /**
     * 清空PLC相关字段（供测试页面一键清空使用）
     */
    private DevicePlcVO.OperationResult handleClearPlc(DeviceConfig deviceConfig) {
        try {
            EnhancedS7Serializer serializer = s7SerializerProvider.getSerializer(deviceConfig);
            if (serializer == null) {
                return buildResult(deviceConfig, "clearPlc", false, "获取PLC序列化器失败");
            }
            
            Map<String, Object> payload = new HashMap<>();
            // 根据卧转立主体写入的字段进行清空
            for (int i = 1; i <= 6; i++) {
                payload.put("plcGlassId" + i, "");
            }
            payload.put("plcGlassCount", 0);
            payload.put("plcRequest", 0);
            payload.put("inPosition", 0);
            
            plcDynamicDataService.writePlcData(deviceConfig, payload, serializer);
            log.info("卧转立主体清空PLC字段完成: deviceId={}", deviceConfig.getId());
            return buildResult(deviceConfig, "clearPlc", true, "已清空卧转立主体PLC字段");
        } catch (Exception e) {
            log.error("卧转立主体清空PLC失败: deviceId={}", deviceConfig.getId(), e);
            return buildResult(deviceConfig, "clearPlc", false, "清空PLC失败: " + e.getMessage());
        }
    }

    /**
     * 构建操作结果
     */
    private DevicePlcVO.OperationResult buildResult(DeviceConfig deviceConfig,
                                                    String operation,
                                                    boolean success,
                                                    String message) {
        return DevicePlcVO.OperationResult.builder()
                .deviceId(deviceConfig.getId())
                .deviceName(deviceConfig.getDeviceName())
                .deviceCode(deviceConfig.getDeviceCode())
                .projectId(deviceConfig.getProjectId() != null ? 
                        String.valueOf(deviceConfig.getProjectId()) : null)
                .operation(operation)
                .success(success)
                .message(message)
                .timestamp(LocalDateTime.now())
                .build();
    }

    /**
     * 应用关闭时清理资源
     */
    @PreDestroy
    public void destroy() {
        log.info("正在关闭卧转立监控线程池...");
        
        // 停止所有监控任务
        for (String deviceId : new ArrayList<>(monitorTasks.keySet())) {
            ScheduledFuture<?> future = monitorTasks.remove(deviceId);
            if (future != null && !future.isCancelled()) {
                future.cancel(false);
            }
        }
        
        // 关闭线程池
        monitorExecutor.shutdown();
        try {
            if (!monitorExecutor.awaitTermination(5, TimeUnit.SECONDS)) {
                monitorExecutor.shutdownNow();
                if (!monitorExecutor.awaitTermination(5, TimeUnit.SECONDS)) {
                    log.warn("卧转立监控线程池未能正常关闭");
                }
            }
        } catch (InterruptedException e) {
            monitorExecutor.shutdownNow();
            Thread.currentThread().interrupt();
        }
        
        log.info("卧转立监控线程池已关闭");
    }

    /**
     * 玻璃缓冲项
     */
    private static class GlassBufferItem {
        final GlassInfo glassInfo;
        final long timestamp;

        GlassBufferItem(GlassInfo glassInfo, long timestamp) {
            this.glassInfo = glassInfo;
            this.timestamp = timestamp;
        }
    }
}