package com.zy.asrs.controller;

import com.alibaba.fastjson.JSON;
import com.core.annotations.ManagerAuth;
import com.core.common.Cools;
import com.core.common.R;
import com.zy.asrs.entity.DeviceDataLog;
import com.zy.common.web.BaseController;
import com.zy.core.enums.SlaveType;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import jakarta.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.RandomAccessFile;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.*;
import java.util.concurrent.ConcurrentHashMap;
import java.util.stream.Collectors;
import java.util.stream.Stream;

@Slf4j
@RestController
public class DeviceLogController extends BaseController {

    private static final List<String> DEVICE_TYPE_ORDER = Arrays.asList("Crn", "DualCrn", "Rgv", "Devp");
    private static final Map<String, String> DEVICE_TYPE_LABELS = new LinkedHashMap<>();

    static {
        DEVICE_TYPE_LABELS.put("Crn", "堆垛机");
        DEVICE_TYPE_LABELS.put("DualCrn", "双工位堆垛机");
        DEVICE_TYPE_LABELS.put("Rgv", "RGV");
        DEVICE_TYPE_LABELS.put("Devp", "输送设备");
    }

    @Value("${deviceLogStorage.loggingPath}")
    private String loggingPath;

    private static class ProgressInfo {
        long totalRaw;
        long processedRaw;
        int totalCount;
        int processedCount;
        boolean finished;
    }

    private static class FileNameInfo {
        String type;
        String deviceNo;
        String day;
        int index;
    }

    private static class FileTimeRange {
        Long startTime;
        Long endTime;
    }

    private static class DeviceAggregate {
        String type;
        String typeLabel;
        String deviceNo;
        int fileCount;
        Long firstTime;
        Long lastTime;
        Integer firstIndex;
        Integer lastIndex;
        Path firstFile;
        Path lastFile;
    }

    private static final Map<String, ProgressInfo> DOWNLOAD_PROGRESS = new ConcurrentHashMap<>();

    @RequestMapping(value = "/deviceLog/dates/auth")
    @ManagerAuth
    public R dates() {
        try {
            Path baseDir = Paths.get(loggingPath);
            if (!Files.exists(baseDir)) {
                return R.ok(new ArrayList<>());
            }
            List<String> days = Files.list(baseDir)
                    .filter(Files::isDirectory)
                    .map(p -> p.getFileName().toString())
                    .filter(name -> name.length() == 8 && name.chars().allMatch(Character::isDigit))
                    .sorted()
                    .collect(Collectors.toList());
            Map<String, Map<String, List<String>>> grouped = new LinkedHashMap<>();
            for (String day : days) {
                String year = day.substring(0, 4);
                String month = day.substring(4, 6);
                grouped.computeIfAbsent(year, k -> new LinkedHashMap<>())
                        .computeIfAbsent(month, k -> new ArrayList<>())
                        .add(day);
            }
            List<Map<String, Object>> tree = new ArrayList<>();
            for (Map.Entry<String, Map<String, List<String>>> yEntry : grouped.entrySet()) {
                Map<String, Object> yNode = new HashMap<>();
                yNode.put("title", yEntry.getKey());
                yNode.put("id", yEntry.getKey());
                List<Map<String, Object>> mChildren = new ArrayList<>();
                for (Map.Entry<String, List<String>> mEntry : yEntry.getValue().entrySet()) {
                    Map<String, Object> mNode = new HashMap<>();
                    mNode.put("title", mEntry.getKey());
                    mNode.put("id", yEntry.getKey() + "-" + mEntry.getKey());
                    List<Map<String, Object>> dChildren = new ArrayList<>();
                    for (String d : mEntry.getValue()) {
                        Map<String, Object> dNode = new HashMap<>();
                        dNode.put("title", d.substring(6, 8));
                        dNode.put("id", d);
                        dNode.put("day", d);
                        dChildren.add(dNode);
                    }
                    mNode.put("children", dChildren);
                    mChildren.add(mNode);
                }
                yNode.put("children", mChildren);
                tree.add(yNode);
            }
            return R.ok(tree);
        } catch (Exception e) {
            return R.error("读取日期失败");
        }
    }

    @RequestMapping(value = "/deviceLog/day/{day}/devices/auth")
    @ManagerAuth
    public R devices(@PathVariable("day") String day) {
        try {
            if (day == null || day.length() != 8 || !day.chars().allMatch(Character::isDigit)) {
                return R.error("日期格式错误");
            }
            Path dayDir = Paths.get(loggingPath, day);
            if (!Files.exists(dayDir) || !Files.isDirectory(dayDir)) {
                return R.ok(new ArrayList<>());
            }
            List<Path> files = Files.list(dayDir)
                    .filter(p -> !Files.isDirectory(p) && p.getFileName().toString().endsWith(".log"))
                    .collect(Collectors.toList());
            Map<String, Map<String, Object>> deviceMap = new HashMap<>();
            for (Path p : files) {
                String name = p.getFileName().toString();
                String[] parts = name.split("_");
                if (parts.length < 4) {
                    continue;
                }
                String deviceNo = parts[1];
                String type = parts[0];
                Map<String, Object> info = deviceMap.computeIfAbsent(deviceNo, k -> {
                    Map<String, Object> map = new HashMap<>();
                    map.put("deviceNo", deviceNo);
                    map.put("types", new HashSet<String>());
                    map.put("fileCount", 0);
                    return map;
                });
                ((Set<String>) info.get("types")).add(type);
                info.put("fileCount", ((Integer) info.get("fileCount")) + 1);
            }
            List<Map<String, Object>> res = deviceMap.values().stream().map(m -> {
                Map<String, Object> x = new HashMap<>();
                x.put("deviceNo", m.get("deviceNo"));
                x.put("types", ((Set<String>) m.get("types")).stream().collect(Collectors.toList()));
                x.put("fileCount", m.get("fileCount"));
                return x;
            }).collect(Collectors.toList());
            return R.ok(res);
        } catch (Exception e) {
            return R.error("读取设备列表失败");
        }
    }

    @RequestMapping(value = "/deviceLog/day/{day}/summary/auth")
    @ManagerAuth
    public R summary(@PathVariable("day") String day) {
        try {
            String dayClean = normalizeDay(day);
            if (dayClean == null) {
                return R.error("日期格式错误");
            }
            Path dayDir = Paths.get(loggingPath, dayClean);
            if (!Files.exists(dayDir) || !Files.isDirectory(dayDir)) {
                return R.ok(buildEmptySummary());
            }

            Map<String, DeviceAggregate> aggregateMap = new LinkedHashMap<>();
            try (Stream<Path> stream = Files.list(dayDir)) {
                List<Path> files = stream
                        .filter(p -> !Files.isDirectory(p) && p.getFileName().toString().endsWith(".log"))
                        .collect(Collectors.toList());
                for (Path file : files) {
                    FileNameInfo info = parseFileName(file.getFileName().toString());
                    if (info == null || !dayClean.equals(info.day) || !DEVICE_TYPE_LABELS.containsKey(info.type)) {
                        continue;
                    }
                    String key = info.type + ":" + info.deviceNo;
                    DeviceAggregate aggregate = aggregateMap.computeIfAbsent(key, k -> {
                        DeviceAggregate x = new DeviceAggregate();
                        x.type = info.type;
                        x.typeLabel = DEVICE_TYPE_LABELS.get(info.type);
                        x.deviceNo = info.deviceNo;
                        return x;
                    });
                    aggregate.fileCount += 1;
                    if (aggregate.firstIndex == null || info.index < aggregate.firstIndex) {
                        aggregate.firstIndex = info.index;
                        aggregate.firstFile = file;
                    }
                    if (aggregate.lastIndex == null || info.index > aggregate.lastIndex) {
                        aggregate.lastIndex = info.index;
                        aggregate.lastFile = file;
                    }
                }
            }
            for (DeviceAggregate aggregate : aggregateMap.values()) {
                if (aggregate.firstFile != null) {
                    FileTimeRange firstRange = readFileTimeRange(aggregate.firstFile);
                    aggregate.firstTime = firstRange.startTime != null ? firstRange.startTime : firstRange.endTime;
                }
                if (aggregate.lastFile != null) {
                    FileTimeRange lastRange = readFileTimeRange(aggregate.lastFile);
                    aggregate.lastTime = lastRange.endTime != null ? lastRange.endTime : lastRange.startTime;
                }
            }
            return R.ok(buildSummaryResponse(aggregateMap.values()));
        } catch (Exception e) {
            log.error("读取设备日志摘要失败", e);
            return R.error("读取设备日志摘要失败");
        }
    }

    @RequestMapping(value = "/deviceLog/day/{day}/timeline/auth")
    @ManagerAuth
    public R timeline(@PathVariable("day") String day,
                      @RequestParam("type") String type,
                      @RequestParam("deviceNo") String deviceNo) {
        try {
            String dayClean = normalizeDay(day);
            if (dayClean == null) {
                return R.error("日期格式错误");
            }
            if (type == null || SlaveType.findInstance(type) == null) {
                return R.error("设备类型错误");
            }
            if (deviceNo == null || !deviceNo.chars().allMatch(Character::isDigit)) {
                return R.error("设备编号错误");
            }
            Path dayDir = Paths.get(loggingPath, dayClean);
            if (!Files.exists(dayDir) || !Files.isDirectory(dayDir)) {
                return R.error("未找到日志文件");
            }
            List<Path> files = findDeviceFiles(dayDir, dayClean, type, deviceNo);
            if (files.isEmpty()) {
                return R.error("未找到日志文件");
            }

            List<Map<String, Object>> segments = new ArrayList<>();
            Long startTime = null;
            for (int i = 0; i < files.size(); i++) {
                Long segmentStart = getFileStartTime(files.get(i));
                if (segmentStart != null && (startTime == null || segmentStart < startTime)) {
                    startTime = segmentStart;
                }
                Map<String, Object> segment = new LinkedHashMap<>();
                segment.put("offset", i);
                segment.put("startTime", segmentStart);
                segment.put("endTime", null);
                segments.add(segment);
            }
            Long endTime = getFileEndTime(files.get(files.size() - 1));
            if (endTime == null) {
                for (int i = segments.size() - 1; i >= 0; i--) {
                    Long segmentStart = (Long) segments.get(i).get("startTime");
                    if (segmentStart != null) {
                        endTime = segmentStart;
                        break;
                    }
                }
            }
            for (int i = 0; i < segments.size(); i++) {
                Long segmentEnd = null;
                if (i < segments.size() - 1) {
                    segmentEnd = (Long) segments.get(i + 1).get("startTime");
                }
                if (segmentEnd == null && i == segments.size() - 1) {
                    segmentEnd = endTime;
                }
                if (segmentEnd == null) {
                    segmentEnd = (Long) segments.get(i).get("startTime");
                }
                segments.get(i).put("endTime", segmentEnd);
            }

            Map<String, Object> result = new HashMap<>();
            result.put("type", type);
            result.put("typeLabel", DEVICE_TYPE_LABELS.getOrDefault(type, type));
            result.put("deviceNo", deviceNo);
            result.put("startTime", startTime);
            result.put("endTime", endTime);
            result.put("totalFiles", files.size());
            result.put("segments", segments);
            return R.ok(result);
        } catch (Exception e) {
            log.error("读取设备日志时间轴失败", e);
            return R.error("读取设备日志时间轴失败");
        }
    }

    @RequestMapping(value = "/deviceLog/day/{day}/preview/auth")
    @ManagerAuth
    public R preview(@PathVariable("day") String day,
                     @RequestParam("type") String type,
                     @RequestParam("deviceNo") String deviceNo,
                     @RequestParam(value = "offset", required = false) Integer offset,
                     @RequestParam(value = "limit", required = false) Integer limit) {
        try {
            String dayClean = day == null ? null : day.replaceAll("\\D", "");
            if (dayClean == null || dayClean.length() != 8 || !dayClean.chars().allMatch(Character::isDigit)) {
                return R.error("日期格式错误");
            }
            if (type == null || SlaveType.findInstance(type) == null) {
                return R.error("设备类型错误");
            }
            if (deviceNo == null || !deviceNo.chars().allMatch(Character::isDigit)) {
                return R.error("设备编号错误");
            }
            Path dayDir = Paths.get(loggingPath, dayClean);
            if (!Files.exists(dayDir) || !Files.isDirectory(dayDir)) {
                return R.ok(new ArrayList<>());
            }
            String prefix = type + "_" + deviceNo + "_" + dayClean + "_";
            List<Path> files = Files.list(dayDir)
                    .filter(p -> {
                        String name = p.getFileName().toString();
                        return name.endsWith(".log") && name.startsWith(prefix);
                    }).collect(Collectors.toList());
            
            files.sort(Comparator.comparingInt(p -> {
                String n = p.getFileName().toString();
                try {
                    String suf = n.substring(prefix.length(), n.length() - 4);
                    return Integer.parseInt(suf);
                } catch (Exception e) {
                    return Integer.MAX_VALUE;
                }
            }));
            
            int from = offset == null || offset < 0 ? 0 : offset;
            int max = limit == null || limit <= 0 ? 5 : limit; // 默认读取5个文件
            if (max > 10) max = 10; // 限制最大文件数，防止超时
            int to = Math.min(files.size(), from + max);
            
            if (from >= files.size()) {
                return R.ok(new ArrayList<>());
            }
            
            List<Path> targetFiles = files.subList(from, to);
            List<DeviceDataLog> resultLogs = new ArrayList<>();
            
            for (Path f : targetFiles) {
                try (Stream<String> lines = Files.lines(f, StandardCharsets.UTF_8)) {
                    lines.forEach(line -> {
                        if (line != null && !line.trim().isEmpty()) {
                            try {
                                DeviceDataLog logItem = JSON.parseObject(line, DeviceDataLog.class);
                                resultLogs.add(logItem);
                            } catch (Exception e) {
                                // 忽略解析错误
                            }
                        }
                    });
                } catch (Exception e) {
                    log.error("读取日志文件失败: " + f, e);
                }
            }
            // 按时间排序
            resultLogs.sort(Comparator.comparing(DeviceDataLog::getCreateTime, Comparator.nullsLast(Date::compareTo)));
            
            return R.ok(resultLogs);
        } catch (Exception e) {
            log.error("预览日志失败", e);
            return R.error("预览日志失败");
        }
    }

    @RequestMapping(value = "/deviceLog/day/{day}/seek/auth")
    @ManagerAuth
    public R seek(@PathVariable("day") String day,
                  @RequestParam("type") String type,
                  @RequestParam("deviceNo") String deviceNo,
                  @RequestParam("timestamp") Long timestamp) {
        try {
            String dayClean = day == null ? null : day.replaceAll("\\D", "");
            if (dayClean == null || dayClean.length() != 8 || !dayClean.chars().allMatch(Character::isDigit)) {
                return R.error("日期格式错误");
            }
            if (type == null || SlaveType.findInstance(type) == null) {
                return R.error("设备类型错误");
            }
            if (deviceNo == null || !deviceNo.chars().allMatch(Character::isDigit)) {
                return R.error("设备编号错误");
            }
            Path dayDir = Paths.get(loggingPath, dayClean);
            if (!Files.exists(dayDir) || !Files.isDirectory(dayDir)) {
                return R.error("未找到日志文件");
            }
            
            String prefix = type + "_" + deviceNo + "_" + dayClean + "_";
            List<Path> files = Files.list(dayDir)
                    .filter(p -> {
                        String name = p.getFileName().toString();
                        return name.endsWith(".log") && name.startsWith(prefix);
                    }).collect(Collectors.toList());
            
            files.sort(Comparator.comparingInt(p -> {
                String n = p.getFileName().toString();
                try {
                    String suf = n.substring(prefix.length(), n.length() - 4);
                    return Integer.parseInt(suf);
                } catch (Exception e) {
                    return Integer.MAX_VALUE;
                }
            }));
            
            if (files.isEmpty()) {
                return R.error("未找到日志文件");
            }
            
            // Binary search for the file containing the timestamp
            // We want to find the LAST file that has startTime <= targetTime.
            // Because files are sequential: [t0, t1), [t1, t2), ...
            // If we find file[i].startTime <= target < file[i+1].startTime, then target is in file[i].
            
            int low = 0;
            int high = files.size() - 1;
            int foundIndex = -1;
            
            while (low <= high) {
                int mid = (low + high) >>> 1;
                Path midFile = files.get(mid);
                
                // Read start time of this file
                Long midStart = getFileStartTime(midFile);
                if (midStart == null) {
                    low = mid + 1;
                    continue;
                }
                
                if (midStart <= timestamp) {
                    // This file starts before or at target. It COULD be the one.
                    // But maybe a later file also starts before target?
                    foundIndex = mid;
                    low = mid + 1; // Try to find a later start time
                } else {
                    // This file starts AFTER target. So target must be in an earlier file.
                    high = mid - 1;
                }
            }
            
            if (foundIndex == -1) {
                foundIndex = 0;
            }
            
            // Return the file index (offset)
            Map<String, Object> result = new HashMap<>();
            result.put("offset", foundIndex);
            return R.ok(result);
            
        } catch (Exception e) {
            log.error("寻址失败", e);
            return R.error("寻址失败");
        }
    }
    
    private Long getFileStartTime(Path file) {
        try {
            String firstLine = readFirstNonBlankLine(file);
            if (firstLine == null) return null;
            DeviceDataLog firstLog = JSON.parseObject(firstLine, DeviceDataLog.class);
            return firstLog.getCreateTime().getTime();
        } catch (Exception e) {
            return null;
        }
    }

    private Long getFileEndTime(Path file) {
        try {
            String lastLine = readLastNonBlankLine(file);
            if (lastLine == null) return null;
            DeviceDataLog lastLog = JSON.parseObject(lastLine, DeviceDataLog.class);
            return lastLog.getCreateTime().getTime();
        } catch (Exception e) {
            return null;
        }
    }

    @RequestMapping(value = "/deviceLog/day/{day}/download/auth")
    @ManagerAuth
    public void download(@PathVariable("day") String day,
                         @RequestParam("type") String type,
                         @RequestParam("deviceNo") String deviceNo,
                         @RequestParam(value = "offset", required = false) Integer offset,
                         @RequestParam(value = "limit", required = false) Integer limit,
                         @RequestParam(value = "progressId", required = false) String progressId,
                         HttpServletResponse response) {
        try {
            String dayClean = day == null ? null : day.replaceAll("\\D", "");
            if (dayClean == null || dayClean.length() != 8 || !dayClean.chars().allMatch(Character::isDigit)) {
                response.setStatus(400);
                return;
            }
            if (type == null || SlaveType.findInstance(type) == null) {
                response.setStatus(400);
                return;
            }
            if (deviceNo == null || !deviceNo.chars().allMatch(Character::isDigit)) {
                response.setStatus(400);
                return;
            }
            Path dayDir = Paths.get(loggingPath, dayClean);
            if (!Files.exists(dayDir) || !Files.isDirectory(dayDir)) {
                response.setStatus(404);
                return;
            }
            List<Path> files = findDeviceFiles(dayDir, dayClean, type, deviceNo);
            files = sliceDownloadFiles(files, offset, limit);
            if (files.isEmpty()) {
                response.setStatus(404);
                return;
            }
            ProgressInfo info;
            String id = progressId;
            if (Cools.isEmpty(id)) {
                id = UUID.randomUUID().toString();
            }
            List<Path> finalFiles = files;
            info = DOWNLOAD_PROGRESS.computeIfAbsent(id, k -> {
                ProgressInfo x = new ProgressInfo();
                x.totalCount = finalFiles.size();
                long sum = 0L;
                for (Path f : finalFiles) {
                    try { sum += Files.size(f); } catch (Exception ignored) {}
                }
                x.totalRaw = sum;
                x.processedRaw = 0L;
                x.processedCount = 0;
                x.finished = false;
                return x;
            });
            response.reset();
            response.setContentType("application/zip");
            String filename = type + "_" + deviceNo + "_" + dayClean + ".zip";
            response.setHeader("Content-Disposition", "attachment; filename=" + filename);
            long totalRawSize = 0L;
            for (Path f : files) {
                try { totalRawSize += Files.size(f); } catch (Exception ignored) {}
            }
            response.setHeader("X-Total-Size", String.valueOf(totalRawSize));
            response.setHeader("X-File-Count", String.valueOf(files.size()));
            response.setHeader("X-Progress-Id", id);
            try (java.util.zip.ZipOutputStream zos = new java.util.zip.ZipOutputStream(response.getOutputStream())) {
                for (Path f : files) {
                    java.util.zip.ZipEntry entry = new java.util.zip.ZipEntry(f.getFileName().toString());
                    zos.putNextEntry(entry);
                    Files.copy(f, zos);
                    zos.closeEntry();
                    try {
                        info.processedRaw += Files.size(f);
                    } catch (Exception ignored) {}
                    info.processedCount += 1;
                }
                zos.finish();
                info.finished = true;
            }
        } catch (Exception e) {
            try { response.setStatus(500); } catch (Exception ignore) {}
        }
    }

    @RequestMapping(value = "/deviceLog/download/init/auth")
    @ManagerAuth
    public R init(@org.springframework.web.bind.annotation.RequestBody com.alibaba.fastjson.JSONObject param) {
        try {
            String day = param.getString("day");
            String type = param.getString("type");
            String deviceNo = param.getString("deviceNo");
            Integer offset = param.getInteger("offset");
            Integer limit = param.getInteger("limit");
            String dayClean = Cools.isEmpty(day) ? null : day.replaceAll("\\D", "");
            if (Cools.isEmpty(dayClean) || dayClean.length() != 8 || !dayClean.chars().allMatch(Character::isDigit)) {
                return R.error("日期格式错误");
            }
            if (Cools.isEmpty(type) || SlaveType.findInstance(type) == null) {
                return R.error("设备类型错误");
            }
            if (Cools.isEmpty(deviceNo) || !deviceNo.chars().allMatch(Character::isDigit)) {
                return R.error("设备编号错误");
            }
            Path dayDir = Paths.get(loggingPath, dayClean);
            if (!Files.exists(dayDir) || !Files.isDirectory(dayDir)) {
                return R.error("当日目录不存在");
            }
            List<Path> files = findDeviceFiles(dayDir, dayClean, type, deviceNo);
            if ((offset != null && offset >= files.size())) {
                return R.error("起始序号超出范围");
            }
            files = sliceDownloadFiles(files, offset, limit);
            if (files.isEmpty()) {
                return R.error("未找到日志文件");
            }
            String id = UUID.randomUUID().toString();
            ProgressInfo info = new ProgressInfo();
            info.totalCount = files.size();
            long sum = 0L;
            for (Path f : files) {
                try { sum += Files.size(f); } catch (Exception ignored) {}
            }
            info.totalRaw = sum;
            info.processedRaw = 0L;
            info.processedCount = 0;
            info.finished = false;
            DOWNLOAD_PROGRESS.put(id, info);
            Map<String, Object> res = new HashMap<>();
            res.put("progressId", id);
            res.put("totalSize", info.totalRaw);
            res.put("fileCount", info.totalCount);
            return R.ok(res);
        } catch (Exception e) {
            return R.error("初始化失败");
        }
    }

    @RequestMapping(value = "/deviceLog/download/progress/auth")
    @ManagerAuth
    public R progress(String id) {
        ProgressInfo info = DOWNLOAD_PROGRESS.get(id);
        if (info == null) {
            return R.error("无效进度");
        }
        long total = info.totalRaw;
        long done = info.processedRaw;
        int percent;
        if (info.finished) {
            percent = 100;
        } else if (total > 0) {
            percent = (int) Math.min(99, (done * 100L) / total);
        } else if (info.totalCount > 0) {
            percent = (int) Math.min(99, (info.processedCount * 100L) / info.totalCount);
        } else {
            percent = 0;
        }
        Map<String, Object> res = new HashMap<>();
        res.put("percent", percent);
        res.put("processedSize", done);
        res.put("totalSize", total);
        res.put("processedCount", info.processedCount);
        res.put("totalCount", info.totalCount);
        res.put("finished", info.finished);
        return R.ok(res);
    }

    @RequestMapping(value = "/deviceLog/enums/auth")
    @ManagerAuth
    public R getEnums() {
        Map<String, Map<String, String>> enums = new HashMap<>();
        
        enums.put("CrnModeType", Arrays.stream(com.zy.core.enums.CrnModeType.values())
                .collect(Collectors.toMap(e -> String.valueOf(e.id), e -> e.desc)));
        
        enums.put("CrnStatusType", Arrays.stream(com.zy.core.enums.CrnStatusType.values())
                .collect(Collectors.toMap(e -> String.valueOf(e.id), e -> e.desc)));
        
        enums.put("CrnForkPosType", Arrays.stream(com.zy.core.enums.CrnForkPosType.values())
                .collect(Collectors.toMap(e -> String.valueOf(e.id), e -> e.desc)));
        
        enums.put("CrnLiftPosType", Arrays.stream(com.zy.core.enums.CrnLiftPosType.values())
                .collect(Collectors.toMap(e -> String.valueOf(e.id), e -> e.desc)));

        enums.put("DualCrnForkPosType", Arrays.stream(com.zy.core.enums.DualCrnForkPosType.values())
                .collect(Collectors.toMap(e -> String.valueOf(e.id), e -> e.desc)));

        enums.put("DualCrnLiftPosType", Arrays.stream(com.zy.core.enums.DualCrnLiftPosType.values())
                .collect(Collectors.toMap(e -> String.valueOf(e.id), e -> e.desc)));

        enums.put("RgvModeType", Arrays.stream(com.zy.core.enums.RgvModeType.values())
                .collect(Collectors.toMap(e -> String.valueOf(e.id), e -> e.desc)));

        enums.put("RgvStatusType", Arrays.stream(com.zy.core.enums.RgvStatusType.values())
                .collect(Collectors.toMap(e -> String.valueOf(e.id), e -> e.desc)));
        
        return R.ok(enums);
    }

    private Map<String, Object> buildEmptySummary() {
        return buildSummaryResponse(Collections.emptyList());
    }

    private Map<String, Object> buildSummaryResponse(Collection<DeviceAggregate> aggregates) {
        List<DeviceAggregate> aggregateList = new ArrayList<>(aggregates);
        Map<String, Object> stats = new LinkedHashMap<>();
        Map<String, Object> typeCounts = new LinkedHashMap<>();
        int totalFiles = 0;
        for (String type : DEVICE_TYPE_ORDER) {
            int count = (int) aggregateList.stream().filter(item -> type.equals(item.type)).count();
            typeCounts.put(type, count);
        }
        for (DeviceAggregate aggregate : aggregateList) {
            totalFiles += aggregate.fileCount;
        }
        stats.put("totalDevices", aggregateList.size());
        stats.put("totalFiles", totalFiles);
        stats.put("typeCounts", typeCounts);

        List<Map<String, Object>> groups = new ArrayList<>();
        for (String type : DEVICE_TYPE_ORDER) {
            List<DeviceAggregate> devices = aggregateList.stream()
                    .filter(item -> type.equals(item.type))
                    .sorted(Comparator.comparingInt(item -> parseDeviceNo(item.deviceNo)))
                    .collect(Collectors.toList());
            Map<String, Object> group = new LinkedHashMap<>();
            group.put("type", type);
            group.put("typeLabel", DEVICE_TYPE_LABELS.get(type));
            group.put("deviceCount", devices.size());
            group.put("totalFiles", devices.stream().mapToInt(item -> item.fileCount).sum());
            group.put("devices", devices.stream().map(item -> {
                Map<String, Object> x = new LinkedHashMap<>();
                x.put("type", item.type);
                x.put("typeLabel", item.typeLabel);
                x.put("deviceNo", item.deviceNo);
                x.put("fileCount", item.fileCount);
                x.put("firstTime", item.firstTime);
                x.put("lastTime", item.lastTime);
                return x;
            }).collect(Collectors.toList()));
            groups.add(group);
        }

        Map<String, Object> result = new LinkedHashMap<>();
        result.put("stats", stats);
        result.put("groups", groups);
        return result;
    }

    private String normalizeDay(String day) {
        String dayClean = day == null ? null : day.replaceAll("\\D", "");
        if (dayClean == null || dayClean.length() != 8 || !dayClean.chars().allMatch(Character::isDigit)) {
            return null;
        }
        return dayClean;
    }

    private List<Path> findDeviceFiles(Path dayDir, String dayClean, String type, String deviceNo) throws Exception {
        String prefix = type + "_" + deviceNo + "_" + dayClean + "_";
        List<Path> files;
        try (Stream<Path> stream = Files.list(dayDir)) {
            files = stream
                    .filter(p -> {
                        String name = p.getFileName().toString();
                        return name.endsWith(".log") && name.startsWith(prefix);
                    })
                    .collect(Collectors.toList());
        }
        files.sort(Comparator.comparingInt(p -> {
            String n = p.getFileName().toString();
            try {
                String suf = n.substring(prefix.length(), n.length() - 4);
                return Integer.parseInt(suf);
            } catch (Exception e) {
                return Integer.MAX_VALUE;
            }
        }));
        return files;
    }

    private List<Path> sliceDownloadFiles(List<Path> files, Integer offset, Integer limit) {
        if (files == null || files.isEmpty()) {
            return Collections.emptyList();
        }
        int from = offset == null || offset < 0 ? 0 : offset;
        if (from >= files.size()) {
            return Collections.emptyList();
        }
        if (offset == null && limit == null) {
            return new ArrayList<>(files);
        }
        int to;
        if (limit == null || limit <= 0) {
            to = files.size();
        } else {
            to = Math.min(files.size(), from + limit);
        }
        return new ArrayList<>(files.subList(from, to));
    }

    private FileNameInfo parseFileName(String fileName) {
        if (fileName == null || !fileName.endsWith(".log")) {
            return null;
        }
        String[] parts = fileName.split("_", 4);
        if (parts.length < 4) {
            return null;
        }
        FileNameInfo info = new FileNameInfo();
        info.type = parts[0];
        info.deviceNo = parts[1];
        info.day = parts[2];
        try {
            info.index = Integer.parseInt(parts[3].replace(".log", ""));
        } catch (Exception e) {
            return null;
        }
        return info;
    }

    private int parseDeviceNo(String deviceNo) {
        try {
            return Integer.parseInt(String.valueOf(deviceNo));
        } catch (Exception e) {
            return Integer.MAX_VALUE;
        }
    }

    private FileTimeRange readFileTimeRange(Path file) {
        FileTimeRange range = new FileTimeRange();
        try {
            String firstLine = readFirstNonBlankLine(file);
            String lastLine = readLastNonBlankLine(file);
            range.startTime = parseLogTime(firstLine);
            range.endTime = parseLogTime(lastLine);
            return range;
        } catch (Exception e) {
            return range;
        }
    }

    private Long parseLogTime(String line) {
        try {
            if (line == null || line.trim().isEmpty()) {
                return null;
            }
            DeviceDataLog logItem = JSON.parseObject(line, DeviceDataLog.class);
            return logItem != null && logItem.getCreateTime() != null ? logItem.getCreateTime().getTime() : null;
        } catch (Exception e) {
            return null;
        }
    }

    private String readFirstNonBlankLine(Path file) {
        try (Stream<String> lines = Files.lines(file, StandardCharsets.UTF_8)) {
            return lines.filter(line -> line != null && !line.trim().isEmpty()).findFirst().orElse(null);
        } catch (Exception e) {
            return null;
        }
    }

    private String readLastNonBlankLine(Path file) {
        try (RandomAccessFile randomAccessFile = new RandomAccessFile(file.toFile(), "r")) {
            long length = randomAccessFile.length();
            if (length <= 0) {
                return null;
            }
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            for (long pointer = length - 1; pointer >= 0; pointer--) {
                randomAccessFile.seek(pointer);
                int read = randomAccessFile.read();
                if (read == '\n' || read == '\r') {
                    if (baos.size() > 0) {
                        break;
                    }
                    continue;
                }
                baos.write(read);
            }
            byte[] bytes = baos.toByteArray();
            for (int i = 0, j = bytes.length - 1; i < j; i++, j--) {
                byte tmp = bytes[i];
                bytes[i] = bytes[j];
                bytes[j] = tmp;
            }
            String line = new String(bytes, StandardCharsets.UTF_8).trim();
            return line.isEmpty() ? null : line;
        } catch (Exception e) {
            return null;
        }
    }
}