using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using OrpaonVision.Core.Common;
using OrpaonVision.Core.HistoryTrace;
using OrpaonVision.Core.Results;
using OrpaonVision.SiteApp.Runtime.Options;
using System.Collections.Concurrent;
using System.Text.Json;

namespace OrpaonVision.SiteApp.Runtime.Services;

/// <summary>
/// 历史追溯服务实现。
/// </summary>
#if DISABLED_LEGACY_HISTORY_TRACE_SERVICE
public sealed class HistoryTraceService : IHistoryTraceService
{
    private readonly ILogger<HistoryTraceService> _logger;
    private readonly RuntimeOptions _options;
    private readonly ConcurrentDictionary<string, object> _tracebackCache = new();
    private readonly object _lock = new();

    /// <summary>
    /// 构造函数。
    /// </summary>
    public HistoryTraceService(ILogger<HistoryTraceService> logger, IOptions<RuntimeOptions> options)
    {
        _logger = logger;
        _options = options.Value;
        _logger.LogInformation("历史追溯服务已初始化");
    }

    /// <inheritdoc />
    public async Task<Result<IReadOnlyList<ProductSessionHistory>>> GetProductSessionHistoryAsync(DateTime startTime, DateTime endTime, string? productTypeCode = null, SessionStatus? sessionStatus = null, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取产品会话历史：开始时间={StartTime}，结束时间={EndTime}，产品类型={ProductTypeCode}，会话状态={SessionStatus}", 
                startTime, endTime, productTypeCode, sessionStatus);

            var cacheKey = $"session_history_{startTime:yyyyMMddHHmm}_{endTime:yyyyMMddHHmm}_{productTypeCode}_{sessionStatus}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取产品会话历史");
                return Result.Success((IReadOnlyList<ProductSessionHistory>)cached);
            }

            var sessionHistory = await GenerateProductSessionHistoryAsync(startTime, endTime, productTypeCode, sessionStatus, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, sessionHistory);
            }

            _logger.LogInformation("产品会话历史获取完成：会话数量={SessionCount}", sessionHistory.Count);
            return Result.Success(sessionHistory);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取产品会话历史失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_PRODUCT_SESSION_HISTORY_FAILED", "获取产品会话历史失败", traceId);
            return Result.FailWithTrace<IReadOnlyList<ProductSessionHistory>>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<ProductSessionDetail>> GetSessionDetailAsync(Guid sessionId, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取会话详细信息：会话ID={SessionId}", sessionId);

            var cacheKey = $"session_detail_{sessionId}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取会话详细信息");
                return Result.Success((ProductSessionDetail)cached);
            }

            var sessionDetail = await GenerateSessionDetailAsync(sessionId, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, sessionDetail);
            }

            _logger.LogInformation("会话详细信息获取完成：会话ID={SessionId}，层数={LayerCount}，截图数={ScreenshotCount}", 
                sessionId, sessionDetail.LayerHistories.Count, sessionDetail.ScreenshotHistories.Count);

            return Result.Success(sessionDetail);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取会话详细信息失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_SESSION_DETAIL_FAILED", "获取会话详细信息失败", traceId);
            return Result.FailWithTrace<ProductSessionDetail>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<IReadOnlyList<LayerProcessingHistory>>> GetLayerProcessingHistoryAsync(Guid sessionId, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取层处理历史：会话ID={SessionId}", sessionId);

            var cacheKey = $"layer_history_{sessionId}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取层处理历史");
                return Result.Success((IReadOnlyList<LayerProcessingHistory>)cached);
            }

            var layerHistory = await GenerateLayerProcessingHistoryAsync(sessionId, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, layerHistory);
            }

            _logger.LogInformation("层处理历史获取完成：会话ID={SessionId}，层数={LayerCount}", sessionId, layerHistory.Count);
            return Result.Success(layerHistory);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取层处理历史失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_LAYER_PROCESSING_HISTORY_FAILED", "获取层处理历史失败", traceId);
            return Result.FailWithTrace<IReadOnlyList<LayerProcessingHistory>>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<LayerProcessingDetail>> GetLayerDetailAsync(Guid layerId, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取层详细信息：层ID={LayerId}", layerId);

            var cacheKey = $"layer_detail_{layerId}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取层详细信息");
                return Result.Success((LayerProcessingDetail)cached);
            }

            var layerDetail = await GenerateLayerDetailAsync(layerId, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, layerDetail);
            }

            _logger.LogInformation("层详细信息获取完成：层ID={LayerId}，检测数={DetectionCount}，截图数={ScreenshotCount}", 
                layerId, layerDetail.PartDetectionResults.Count, layerDetail.ScreenshotHistories.Count);

            return Result.Success(layerDetail);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取层详细信息失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_LAYER_DETAIL_FAILED", "获取层详细信息失败", traceId);
            return Result.FailWithTrace<LayerProcessingDetail>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<IReadOnlyList<ScreenshotHistory>>> GetScreenshotHistoryAsync(Guid? sessionId = null, Guid? layerId = null, DateTime? startTime = null, DateTime? endTime = null, ScreenshotType? screenshotType = null, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取截图历史：会话ID={SessionId}，层ID={LayerId}，开始时间={StartTime}，结束时间={EndTime}，截图类型={ScreenshotType}", 
                sessionId, layerId, startTime, endTime, screenshotType);

            var cacheKey = $"screenshot_history_{sessionId}_{layerId}_{startTime:yyyyMMddHHmm}_{endTime:yyyyMMddHHmm}_{screenshotType}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取截图历史");
                return Result.Success((IReadOnlyList<ScreenshotHistory>)cached);
            }

            var screenshotHistory = await GenerateScreenshotHistoryAsync(sessionId, layerId, startTime, endTime, screenshotType, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, screenshotHistory);
            }

            _logger.LogInformation("截图历史获取完成：截图数量={ScreenshotCount}", screenshotHistory.Count);
            return Result.Success(screenshotHistory);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取截图历史失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_SCREENSHOT_HISTORY_FAILED", "获取截图历史失败", traceId);
            return Result.FailWithTrace<IReadOnlyList<ScreenshotHistory>>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<ScreenshotDetail>> GetScreenshotDetailAsync(Guid screenshotId, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取截图详细信息：截图ID={ScreenshotId}", screenshotId);

            var cacheKey = $"screenshot_detail_{screenshotId}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取截图详细信息");
                return Result.Success((ScreenshotDetail)cached);
            }

            var screenshotDetail = await GenerateScreenshotDetailAsync(screenshotId, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, screenshotDetail);
            }

            _logger.LogInformation("截图详细信息获取完成：截图ID={ScreenshotId}，检测数={DetectionCount}，缺陷数={DefectCount}，标注数={AnnotationCount}", 
                screenshotId, screenshotDetail.AssociatedDetections.Count, screenshotDetail.AssociatedDefects.Count, screenshotDetail.Annotations.Count);

            return Result.Success(screenshotDetail);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取截图详细信息失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_SCREENSHOT_DETAIL_FAILED", "获取截图详细信息失败", traceId);
            return Result.FailWithTrace<ScreenshotDetail>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<byte[]>> GetScreenshotContentAsync(Guid screenshotId, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取截图文件内容：截图ID={ScreenshotId}", screenshotId);

            var content = await GenerateScreenshotContentAsync(screenshotId, cancellationToken);

            _logger.LogInformation("截图文件内容获取完成：截图ID={ScreenshotId}，文件大小={FileSizeBytes}字节", 
                screenshotId, content.Length);

            return Result.Success(content);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取截图文件内容失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_SCREENSHOT_CONTENT_FAILED", "获取截图文件内容失败", traceId);
            return Result.FailWithTrace<byte[]>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<EvidenceChain>> GetEvidenceChainAsync(Guid sessionId, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取证据链信息：会话ID={SessionId}", sessionId);

            var cacheKey = $"evidence_chain_{sessionId}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取证据链信息");
                return Result.Success((EvidenceChain)cached);
            }

            var evidenceChain = await GenerateEvidenceChainAsync(sessionId, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, evidenceChain);
            }

            _logger.LogInformation("证据链信息获取完成：会话ID={SessionId}，节点数={NodeCount}，完整性={Completeness:F2}，可信度={Credibility:F2}", 
                sessionId, evidenceChain.EvidenceNodes.Count, evidenceChain.CompletenessScore, evidenceChain.CredibilityScore);

            return Result.Success(evidenceChain);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取证据链信息失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_EVIDENCE_CHAIN_FAILED", "获取证据链信息失败", traceId);
            return Result.FailWithTrace<EvidenceChain>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<LayerEvidenceTraceback>> GetLayerEvidenceTracebackAsync(Guid sessionId, int? layerSequence = null, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取层级证据回溯：会话ID={SessionId}，层序号={LayerSequence}", sessionId, layerSequence);

            var cacheKey = $"layer_traceback_{sessionId}_{layerSequence}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取层级证据回溯");
                return Result.Success((LayerEvidenceTraceback)cached);
            }

            var layerTraceback = await GenerateLayerEvidenceTracebackAsync(sessionId, layerSequence, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, layerTraceback);
            }

            _logger.LogInformation("层级证据回溯获取完成：会话ID={SessionId}，链路数={LinkCount}，完整性={Completeness:F2}", 
                sessionId, layerTraceback.LayerEvidenceLinks.Count, layerTraceback.Summary.TracebackCompletenessScore);

            return Result.Success(layerTraceback);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取层级证据回溯失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_LAYER_EVIDENCE_TRACEBACK_FAILED", "获取层级证据回溯失败", traceId);
            return Result.FailWithTrace<LayerEvidenceTraceback>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<DefectTraceback>> GetDefectTracebackAsync(Guid sessionId, DefectType? defectType = null, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取缺陷追溯信息：会话ID={SessionId}，缺陷类型={DefectType}", sessionId, defectType);

            var cacheKey = $"defect_traceback_{sessionId}_{defectType}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取缺陷追溯信息");
                return Result.Success((DefectTraceback)cached);
            }

            var defectTraceback = await GenerateDefectTracebackAsync(sessionId, defectType, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, defectTraceback);
            }

            _logger.LogInformation("缺陷追溯信息获取完成：会话ID={SessionId}，链路数={LinkCount}，缺陷数={DefectCount}", 
                sessionId, defectTraceback.DefectTracebackLinks.Count, defectTraceback.DefectStatistics.TotalDefectCount);

            return Result.Success(defectTraceback);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取缺陷追溯信息失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_DEFECT_TRACEBACK_FAILED", "获取缺陷追溯信息失败", traceId);
            return Result.FailWithTrace<DefectTraceback>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<IReadOnlyList<OperationHistory>>> GetOperationHistoryAsync(Guid? sessionId = null, string? operatorId = null, DateTime? startTime = null, DateTime? endTime = null, OperationType? operationType = null, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取操作历史记录：会话ID={SessionId}，操作员ID={OperatorId}，开始时间={StartTime}，结束时间={EndTime}，操作类型={OperationType}", 
                sessionId, operatorId, startTime, endTime, operationType);

            var cacheKey = $"operation_history_{sessionId}_{operatorId}_{startTime:yyyyMMddHHmm}_{endTime:yyyyMMddHHmm}_{operationType}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取操作历史记录");
                return Result.Success((IReadOnlyList<OperationHistory>)cached);
            }

            var operationHistory = await GenerateOperationHistoryAsync(sessionId, operatorId, startTime, endTime, operationType, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, operationHistory);
            }

            _logger.LogInformation("操作历史记录获取完成：操作数量={OperationCount}", operationHistory.Count);
            return Result.Success(operationHistory);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取操作历史记录失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_OPERATION_HISTORY_FAILED", "获取操作历史记录失败", traceId);
            return Result.FailWithTrace<IReadOnlyList<OperationHistory>>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<ComprehensiveTracebackReport>> GetComprehensiveTracebackReportAsync(Guid sessionId, OrpaonVision.Core.HistoryTrace.TracebackReportType reportType, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取综合追溯报告：会话ID={SessionId}，报告类型={ReportType}", sessionId, reportType);

            var report = await GenerateComprehensiveTracebackReportAsync(sessionId, reportType, cancellationToken);

            _logger.LogInformation("综合追溯报告获取完成：报告ID={ReportId}，报告类型={ReportType}，评分={OverallScore:F2}", 
                report.ReportId, report.ReportType, report.ExecutiveSummary.OverallScore);

            return Result.Success(report);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取综合追溯报告失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_COMPREHENSIVE_TRACEBACK_REPORT_FAILED", "获取综合追溯报告失败", traceId);
            return Result.FailWithTrace<ComprehensiveTracebackReport>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<TracebackStatistics>> GetTracebackStatisticsAsync(DateTime startTime, DateTime endTime, string? productTypeCode = null, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("获取追溯统计数据：开始时间={StartTime}，结束时间={EndTime}，产品类型={ProductTypeCode}", 
                startTime, endTime, productTypeCode);

            var cacheKey = $"traceback_statistics_{startTime:yyyyMMddHHmm}_{endTime:yyyyMMddHHmm}_{productTypeCode}";
            
            if (_options.EnableStatisticsCache && _tracebackCache.TryGetValue(cacheKey, out var cached))
            {
                _logger.LogDebug("从缓存获取追溯统计数据");
                return Result.Success((TracebackStatistics)cached);
            }

            var statistics = await GenerateTracebackStatisticsAsync(startTime, endTime, productTypeCode, cancellationToken);

            if (_options.EnableStatisticsCache)
            {
                _tracebackCache.TryAdd(cacheKey, statistics);
            }

            _logger.LogInformation("追溯统计数据获取完成：总会话数={TotalSession}，完成率={CompletionRate:F2}%，平均时长={AvgDuration:F2}分钟", 
                statistics.TotalSessionCount, statistics.SessionCompletionRate, statistics.AverageSessionDurationMinutes);

            return Result.Success(statistics);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "获取追溯统计数据失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "GET_TRACEBACK_STATISTICS_FAILED", "获取追溯统计数据失败", traceId);
            return Result.FailWithTrace<TracebackStatistics>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<HistorySearchResult>> SearchHistoryAsync(HistorySearchRequest searchRequest, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("搜索历史记录：搜索ID={SearchId}，关键词={Keyword}，搜索类型={SearchType}", 
                searchRequest.SearchId, searchRequest.SearchKeyword, searchRequest.SearchType);

            var searchResult = await GenerateHistorySearchResultAsync(searchRequest, cancellationToken);

            _logger.LogInformation("历史记录搜索完成：搜索ID={SearchId}，总结果数={TotalCount}，返回数={ReturnedCount}，耗时={ElapsedMs}ms", 
                searchRequest.SearchId, searchResult.TotalResultCount, searchResult.ReturnedResultCount, searchResult.SearchElapsedMs);

            return Result.Success(searchResult);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "搜索历史记录失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "SEARCH_HISTORY_FAILED", "搜索历史记录失败", traceId);
            return Result.FailWithTrace<HistorySearchResult>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    /// <inheritdoc />
    public async Task<Result<TracebackExportResult>> ExportTracebackDataAsync(TracebackExportRequest exportRequest, CancellationToken cancellationToken = default)
    {
        try
        {
            _logger.LogInformation("导出追溯数据：导出ID={ExportId}，导出类型={ExportType}，格式={ExportFormat}", 
                exportRequest.ExportId, exportRequest.ExportType, exportRequest.ExportFormat);

            var startTime = DateTime.UtcNow;
            var result = await GenerateTracebackExportAsync(exportRequest, cancellationToken);
            var elapsed = DateTime.UtcNow - startTime;

            var exportResult = new TracebackExportResult
            {
                ExportId = exportRequest.ExportId,
                IsSuccess = true,
                FilePath = result.FilePath,
                FileSizeBytes = result.FileSizeBytes,
                RecordCount = result.RecordCount,
                ExportElapsedMs = (long)elapsed.TotalMilliseconds,
                ExportTimeUtc = DateTime.UtcNow,
                ResultDescription = $"导出完成：{result.RecordCount}条记录，文件大小{result.FileSizeBytes}字节",
                ExportStatistics = result.ExportStatistics,
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["export_type"] = exportRequest.ExportType,
                    ["export_format"] = exportRequest.ExportFormat,
                    ["request_user"] = exportRequest.RequestUser
                }
            };

            _logger.LogInformation("追溯数据导出完成：文件路径={FilePath}，记录数量={RecordCount}，耗时={ElapsedMs}ms", 
                exportResult.FilePath, exportResult.RecordCount, exportResult.ExportElapsedMs);

            return Result.Success(exportResult);
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError(ex, "导出追溯数据失败。TraceId: {TraceId}", traceId);
            var result = Result.FromException(ex, "EXPORT_TRACEBACK_DATA_FAILED", "导出追溯数据失败", traceId);
            return Result.FailWithTrace<TracebackExportResult>(result.Code, result.Message, result.TraceId ?? traceId, result.Errors.ToArray());
        }
    }

    #region 私有方法

    /// <summary>
    /// 生成产品会话历史。
    /// </summary>
    private async Task<IReadOnlyList<ProductSessionHistory>> GenerateProductSessionHistoryAsync(DateTime startTime, DateTime endTime, string? productTypeCode, SessionStatus? sessionStatus, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var sessionHistory = new List<ProductSessionHistory>();
        var current = startTime;

        while (current <= endTime)
        {
            var sessionCount = random.Next(5, 15);
            
            for (int i = 0; i < sessionCount; i++)
            {
                var status = sessionStatus ?? (SessionStatus)random.Next(0, 6);
                var sessionStartTime = current.AddHours(random.Next(0, 24)).AddMinutes(random.Next(0, 60));
                var sessionEndTime = status == SessionStatus.Completed ? sessionStartTime.AddMinutes(random.Next(30, 120)) : null;

                sessionHistory.Add(new ProductSessionHistory
                {
                    SessionId = Guid.NewGuid(),
                    ProductSerialNumber = $"SN{random.Next(100000, 999999)}",
                    ProductTypeCode = productTypeCode ?? $"PT{random.Next(1, 10)}",
                    SessionStatus = status,
                    SessionStartTimeUtc = sessionStartTime,
                    SessionEndTimeUtc = sessionEndTime,
                    OperatorId = $"OP{random.Next(1, 10):D3}",
                    OperatorName = $"操作员{random.Next(1, 10)}",
                    StationId = $"ST{random.Next(1, 5):D3}",
                    StationName = $"工位{random.Next(1, 5)}",
                    TotalLayerCount = random.Next(3, 8),
                    CompletedLayerCount = random.Next(0, 8),
                    FinalJudgmentResult = status == SessionStatus.Completed ? (FinalJudgmentResult)random.Next(0, 4) : null,
                    DefectCount = random.Next(0, 10),
                    AlarmCount = random.Next(0, 5),
                    ScreenshotCount = random.Next(10, 50),
                    ExtendedProperties = new Dictionary<string, object>
                    {
                        ["generation_time_ms"] = 20,
                        ["data_source"] = "simulated"
                    }
                });
            }

            current = current.AddDays(1);
        }

        return sessionHistory.AsReadOnly();
    }

    /// <summary>
    /// 生成会话详细信息。
    /// </summary>
    private async Task<ProductSessionDetail> GenerateSessionDetailAsync(Guid sessionId, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var sessionHistory = new ProductSessionHistory
        {
            SessionId = sessionId,
            ProductSerialNumber = $"SN{random.Next(100000, 999999)}",
            ProductTypeCode = $"PT{random.Next(1, 10)}",
            SessionStatus = SessionStatus.Completed,
            SessionStartTimeUtc = DateTime.UtcNow.AddHours(-random.Next(1, 24)),
            SessionEndTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 60)),
            OperatorId = $"OP{random.Next(1, 10):D3}",
            OperatorName = $"操作员{random.Next(1, 10)}",
            StationId = $"ST{random.Next(1, 5):D3}",
            StationName = $"工位{random.Next(1, 5)}",
            TotalLayerCount = random.Next(3, 8),
            CompletedLayerCount = random.Next(3, 8),
            FinalJudgmentResult = (FinalJudgmentResult)random.Next(0, 4),
            DefectCount = random.Next(0, 10),
            AlarmCount = random.Next(0, 5),
            ScreenshotCount = random.Next(10, 50)
        };

        var layerHistories = await GenerateLayerProcessingHistoryAsync(sessionId, cancellationToken);
        var screenshotHistories = await GenerateScreenshotHistoryAsync(sessionId, null, null, null, null, cancellationToken);
        var operationHistories = await GenerateOperationHistoryAsync(sessionId, null, null, null, null, cancellationToken);
        var evidenceChain = await GenerateEvidenceChainAsync(sessionId, cancellationToken);
        var defectTraceback = await GenerateDefectTracebackAsync(sessionId, null, cancellationToken);

        return new ProductSessionDetail
        {
            SessionHistory = sessionHistory,
            LayerHistories = layerHistories,
            ScreenshotHistories = screenshotHistories,
            OperationHistories = operationHistories,
            EvidenceChain = evidenceChain,
            DefectTraceback = defectTraceback,
            PerformanceMetrics = GenerateSessionPerformanceMetrics(random),
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 50,
                ["data_source"] = "simulated"
            }
        };
    }

    /// <summary>
    /// 生成层处理历史。
    /// </summary>
    private async Task<IReadOnlyList<LayerProcessingHistory>> GenerateLayerProcessingHistoryAsync(Guid sessionId, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var layerHistory = new List<LayerProcessingHistory>();
        var layerCount = random.Next(3, 8);

        for (int i = 1; i <= layerCount; i++)
        {
            var layerStartTime = DateTime.UtcNow.AddHours(-random.Next(1, 24)).AddMinutes(i * 10);
            var layerEndTime = layerStartTime.AddSeconds(random.Next(30, 120));

            layerHistory.Add(new LayerProcessingHistory
            {
                LayerId = Guid.NewGuid(),
                SessionId = sessionId,
                LayerSequence = i,
                LayerName = $"第{i}层",
                LayerType = $"LayerType{random.Next(1, 5)}",
                LayerStatus = LayerStatus.Completed,
                LayerStartTimeUtc = layerStartTime,
                LayerEndTimeUtc = layerEndTime,
                DetectedPartCount = random.Next(5, 20),
                QualifiedPartCount = random.Next(4, 20),
                DefectivePartCount = random.Next(0, 5),
                LayerJudgmentResult = (LayerJudgmentResult)random.Next(0, 4),
                Defects = GenerateLayerDefects(random, i),
                ScreenshotCount = random.Next(3, 10),
                AlarmCount = random.Next(0, 3),
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["generation_time_ms"] = 15,
                    ["data_source"] = "simulated"
                }
            });
        }

        return layerHistory.AsReadOnly();
    }

    /// <summary>
    /// 生成层详细信息。
    /// </summary>
    private async Task<LayerProcessingDetail> GenerateLayerDetailAsync(Guid layerId, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var layerHistory = new LayerProcessingHistory
        {
            LayerId = layerId,
            SessionId = Guid.NewGuid(),
            LayerSequence = random.Next(1, 8),
            LayerName = $"第{random.Next(1, 8)}层",
            LayerType = $"LayerType{random.Next(1, 5)}",
            LayerStatus = LayerStatus.Completed,
            LayerStartTimeUtc = DateTime.UtcNow.AddHours(-random.Next(1, 24)),
            LayerEndTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 60)),
            DetectedPartCount = random.Next(5, 20),
            QualifiedPartCount = random.Next(4, 20),
            DefectivePartCount = random.Next(0, 5),
            LayerJudgmentResult = (LayerJudgmentResult)random.Next(0, 4),
            Defects = GenerateLayerDefects(random, random.Next(1, 8)),
            ScreenshotCount = random.Next(3, 10),
            AlarmCount = random.Next(0, 3)
        };

        var screenshotHistories = await GenerateScreenshotHistoryAsync(layerHistory.SessionId, layerId, null, null, null, cancellationToken);
        var operationHistories = await GenerateOperationHistoryAsync(layerHistory.SessionId, null, null, null, null, cancellationToken);
        var partDetectionResults = GeneratePartDetectionResults(random, layerId);
        var ruleExecutionResults = GenerateRuleExecutionResults(random, layerId);

        return new LayerProcessingDetail
        {
            LayerHistory = layerHistory,
            ScreenshotHistories = screenshotHistories,
            OperationHistories = operationHistories,
            PartDetectionResults = partDetectionResults,
            RuleExecutionResults = ruleExecutionResults,
            PerformanceMetrics = GenerateLayerPerformanceMetrics(random),
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 25,
                ["data_source"] = "simulated"
            }
        };
    }

    /// <summary>
    /// 生成截图历史。
    /// </summary>
    private async Task<IReadOnlyList<ScreenshotHistory>> GenerateScreenshotHistoryAsync(Guid? sessionId, Guid? layerId, DateTime? startTime, DateTime? endTime, ScreenshotType? screenshotType, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var screenshotHistory = new List<ScreenshotHistory>();
        var screenshotCount = random.Next(5, 20);

        for (int i = 0; i < screenshotCount; i++)
        {
            var screenshotTime = startTime?.AddMinutes(random.Next(0, (int)(endTime - startTime).Value.TotalMinutes)) ?? DateTime.UtcNow.AddMinutes(-random.Next(10, 120));
            var type = screenshotType ?? (ScreenshotType)random.Next(0, 8);

            screenshotHistory.Add(new ScreenshotHistory
            {
                ScreenshotId = Guid.NewGuid(),
                SessionId = sessionId ?? Guid.NewGuid(),
                LayerId = layerId,
                ScreenshotType = type,
                ScreenshotTimeUtc = screenshotTime,
                FilePath = $"/screenshots/{Guid.NewGuid():N}.jpg",
                FileSizeBytes = random.Next(100000, 5000000),
                FileFormat = "JPEG",
                ImageWidth = random.Next(1920, 4096),
                ImageHeight = random.Next(1080, 2160),
                ImageDescription = $"{type}截图",
                AssociatedDetectionCount = random.Next(0, 20),
                AssociatedDefectCount = random.Next(0, 5),
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["generation_time_ms"] = 10,
                    ["data_source"] = "simulated"
                }
            });
        }

        return screenshotHistory.AsReadOnly();
    }

    /// <summary>
    /// 生成截图详细信息。
    /// </summary>
    private async Task<ScreenshotDetail> GenerateScreenshotDetailAsync(Guid screenshotId, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var screenshotHistory = new ScreenshotHistory
        {
            ScreenshotId = screenshotId,
            SessionId = Guid.NewGuid(),
            LayerId = Guid.NewGuid(),
            ScreenshotType = (ScreenshotType)random.Next(0, 8),
            ScreenshotTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 120)),
            FilePath = $"/screenshots/{screenshotId:N}.jpg",
            FileSizeBytes = random.Next(100000, 5000000),
            FileFormat = "JPEG",
            ImageWidth = random.Next(1920, 4096),
            ImageHeight = random.Next(1080, 2160),
            ImageDescription = "检测截图",
            AssociatedDetectionCount = random.Next(0, 20),
            AssociatedDefectCount = random.Next(0, 5)
        };

        var imageMetadata = GenerateImageMetadata(random);
        var associatedDetections = GeneratePartDetectionResults(random, Guid.NewGuid());
        var associatedDefects = GenerateLayerDefects(random, random.Next(1, 8));
        var annotations = GenerateImageAnnotations(random);

        return new ScreenshotDetail
        {
            ScreenshotHistory = screenshotHistory,
            ImageMetadata = imageMetadata,
            AssociatedDetections = associatedDetections,
            AssociatedDefects = associatedDefects,
            Annotations = annotations,
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 20,
                ["data_source"] = "simulated"
            }
        };
    }

    /// <summary>
    /// 生成截图文件内容。
    /// </summary>
    private async Task<byte[]> GenerateScreenshotContentAsync(Guid screenshotId, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        // 简化处理：生成模拟的JPEG文件头
        var random = new Random();
        var fileSize = random.Next(100000, 5000000);
        var content = new byte[fileSize];

        // JPEG文件头
        var jpegHeader = new byte[] { 0xFF, 0xD8, 0xFF, 0xE0 };
        Array.Copy(jpegHeader, content, jpegHeader.Length);

        // 填充随机数据
        for (int i = jpegHeader.Length; i < fileSize - 2; i++)
        {
            content[i] = (byte)random.Next(0, 256);
        }

        // JPEG文件尾
        content[fileSize - 2] = 0xFF;
        content[fileSize - 1] = 0xD9;

        return content;
    }

    /// <summary>
    /// 生成证据链。
    /// </summary>
    private async Task<EvidenceChain> GenerateEvidenceChainAsync(Guid sessionId, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var evidenceNodes = new List<EvidenceNode>();
        var nodeCount = random.Next(10, 30);

        for (int i = 0; i < nodeCount; i++)
        {
            evidenceNodes.Add(new EvidenceNode
            {
                NodeId = Guid.NewGuid(),
                NodeType = (EvidenceNodeType)random.Next(0, 10),
                NodeWeight = random.NextDouble(),
                NodeTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 120)),
                NodeDescription = $"证据节点{i + 1}",
                AssociatedDataId = Guid.NewGuid(),
                AssociatedDataType = $"DataType{random.Next(1, 5)}",
                ChildNodes = new List<EvidenceNode>(),
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["node_index"] = i,
                    ["generation_time_ms"] = 5
                }
            });
        }

        return new EvidenceChain
        {
            EvidenceChainId = Guid.NewGuid(),
            SessionId = sessionId,
            CreatedAtUtc = DateTime.UtcNow,
            CompletenessScore = 0.8 + random.NextDouble() * 0.2,
            CredibilityScore = 0.85 + random.NextDouble() * 0.15,
            EvidenceNodes = evidenceNodes.AsReadOnly(),
            Summary = GenerateEvidenceChainSummary(random, evidenceNodes.Count),
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 30,
                ["data_source"] = "simulated"
            }
        };
    }

    /// <summary>
    /// 生成层级证据回溯。
    /// </summary>
    private async Task<LayerEvidenceTraceback> GenerateLayerEvidenceTracebackAsync(Guid sessionId, int? layerSequence, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var layerEvidenceLinks = new List<LayerEvidenceLink>();
        var linkCount = random.Next(3, 8);

        for (int i = 1; i <= linkCount; i++)
        {
            if (layerSequence.HasValue && i != layerSequence.Value)
                continue;

            var keyScreenshots = await GenerateScreenshotHistoryAsync(sessionId, Guid.NewGuid(), null, null, null, cancellationToken);
            var keyDefects = GenerateLayerDefects(random, i);
            var keyOperations = await GenerateOperationHistoryAsync(sessionId, null, null, null, null, cancellationToken);

            layerEvidenceLinks.Add(new LayerEvidenceLink
            {
                LinkId = Guid.NewGuid(),
                LayerSequence = i,
                LayerName = $"第{i}层",
                LayerProcessingTimeUtc = DateTime.UtcNow.AddHours(-random.Next(1, 24)).AddMinutes(i * 10),
                KeyScreenshots = keyScreenshots.Take(random.Next(1, 4)).ToList(),
                KeyDefects = keyDefects,
                KeyOperations = keyOperations.Take(random.Next(1, 3)).ToList(),
                LinkCompleteness = 0.7 + random.NextDouble() * 0.3,
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["generation_time_ms"] = 15
                }
            });
        }

        return new LayerEvidenceTraceback
        {
            SessionId = sessionId,
            TracebackTimeUtc = DateTime.UtcNow,
            LayerEvidenceLinks = layerEvidenceLinks.AsReadOnly(),
            Summary = GenerateLayerTracebackSummary(random, layerEvidenceLinks.Count),
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 40,
                ["data_source"] = "simulated"
            }
        };
    }

    /// <summary>
    /// 生成缺陷追溯。
    /// </summary>
    private async Task<DefectTraceback> GenerateDefectTracebackAsync(Guid sessionId, DefectType? defectType, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var defectTracebackLinks = new List<DefectTracebackLink>();
        var linkCount = random.Next(0, 10);

        for (int i = 0; i < linkCount; i++)
        {
            var type = defectType ?? (DefectType)random.Next(0, 8);
            var associatedScreenshot = (await GenerateScreenshotHistoryAsync(sessionId, null, null, null, null, cancellationToken)).FirstOrDefault();
            var associatedOperations = (await GenerateOperationHistoryAsync(sessionId, null, null, null, null, cancellationToken)).Take(random.Next(1, 3)).ToList();

            defectTracebackLinks.Add(new DefectTracebackLink
            {
                LinkId = Guid.NewGuid(),
                DefectId = Guid.NewGuid(),
                DefectType = type,
                DefectSeverity = (DefectSeverity)random.Next(0, 4),
                DiscoveryTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 120)),
                LayerSequence = random.Next(1, 8),
                LayerName = $"第{random.Next(1, 8)}层",
                RootCauseAnalysis = $"根本原因分析{i + 1}",
                AssociatedScreenshot = associatedScreenshot,
                AssociatedOperations = associatedOperations,
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["generation_time_ms"] = 12
                }
            });
        }

        return new DefectTraceback
        {
            SessionId = sessionId,
            TracebackTimeUtc = DateTime.UtcNow,
            DefectTracebackLinks = defectTracebackLinks.AsReadOnly(),
            DefectStatistics = GenerateDefectStatisticsAnalysis(random, defectTracebackLinks.Count),
            PatternAnalysis = GenerateDefectPatternAnalysis(random),
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 35,
                ["data_source"] = "simulated"
            }
        };
    }

    /// <summary>
    /// 生成操作历史。
    /// </summary>
    private async Task<IReadOnlyList<OperationHistory>> GenerateOperationHistoryAsync(Guid? sessionId, string? operatorId, DateTime? startTime, DateTime? endTime, OperationType? operationType, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var operationHistory = new List<OperationHistory>();
        var operationCount = random.Next(5, 20);

        for (int i = 0; i < operationCount; i++)
        {
            var operationTime = startTime?.AddMinutes(random.Next(0, (int)(endTime - startTime).Value.TotalMinutes)) ?? DateTime.UtcNow.AddMinutes(-random.Next(10, 120));
            var type = operationType ?? (OperationType)random.Next(0, 14);

            operationHistory.Add(new OperationHistory
            {
                OperationId = Guid.NewGuid(),
                SessionId = sessionId ?? Guid.NewGuid(),
                LayerId = Guid.NewGuid(),
                OperationType = type,
                OperationTimeUtc = operationTime,
                OperatorId = operatorId ?? $"OP{random.Next(1, 10):D3}",
                OperatorName = $"操作员{random.Next(1, 10)}",
                OperationDescription = $"{type}操作{i + 1}",
                OperationResult = (OperationResult)random.Next(0, 6),
                OperationParameters = new Dictionary<string, object>
                {
                    ["param1"] = $"value{random.Next(1, 100)}",
                    ["param2"] = random.NextDouble()
                },
                OperationDurationMs = random.Next(100, 5000),
                AssociatedScreenshotId = Guid.NewGuid(),
                ErrorMessage = random.NextDouble() > 0.8 ? $"错误信息{random.Next(1, 10)}" : null,
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["generation_time_ms"] = 8,
                    ["data_source"] = "simulated"
                }
            });
        }

        return operationHistory.AsReadOnly();
    }

    /// <summary>
    /// 生成综合追溯报告。
    /// </summary>
    private async Task<ComprehensiveTracebackReport> GenerateComprehensiveTracebackReportAsync(Guid sessionId, OrpaonVision.Core.HistoryTrace.TracebackReportType reportType, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var sessionDetail = await GenerateSessionDetailAsync(sessionId, cancellationToken);

        return new ComprehensiveTracebackReport
        {
            ReportId = Guid.NewGuid(),
            ReportType = reportType,
            SessionId = sessionId,
            GeneratedAtUtc = DateTime.UtcNow,
            ReportTitle = $"{reportType}追溯报告",
            ExecutiveSummary = GenerateReportExecutiveSummary(random),
            SessionOverview = sessionDetail,
            LayerAnalyses = GenerateLayerAnalysisReports(random, sessionDetail.LayerHistories.Count),
            DefectAnalysis = GenerateDefectAnalysisReport(random),
            PerformanceAnalysis = GeneratePerformanceAnalysisReport(random),
            EvidenceChainAnalysis = GenerateEvidenceChainAnalysis(random),
            ImprovementSuggestions = GenerateTracebackImprovementSuggestions(random),
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 100,
                ["data_source"] = "simulated"
            }
        };
    }

    /// <summary>
    /// 生成追溯统计数据。
    /// </summary>
    private async Task<TracebackStatistics> GenerateTracebackStatisticsAsync(DateTime startTime, DateTime endTime, string? productTypeCode, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var timeRange = new TimeRange { StartTimeUtc = startTime, EndTimeUtc = endTime };
        var totalSessionCount = random.Next(50, 200);
        var completedSessionCount = (int)(totalSessionCount * (0.8 + random.NextDouble() * 0.15));

        return new TracebackStatistics
        {
            TimeRange = timeRange,
            ProductTypeCode = productTypeCode ?? "default",
            TotalSessionCount = totalSessionCount,
            CompletedSessionCount = completedSessionCount,
            TotalLayerCount = totalSessionCount * random.Next(3, 8),
            TotalScreenshotCount = totalSessionCount * random.Next(10, 50),
            TotalDefectCount = random.Next(0, totalSessionCount * 5),
            TotalOperationCount = totalSessionCount * random.Next(20, 100),
            AverageSessionDurationMinutes = 45 + random.NextDouble() * 30,
            AverageLayerProcessingTimeSeconds = 30 + random.NextDouble() * 20,
            ByDate = GenerateDailyTracebackStatistics(startTime, endTime, random),
            ByProductType = GenerateProductTypeTracebackStatistics(random),
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 60,
                ["data_source"] = "simulated"
            }
        };
    }

    /// <summary>
    /// 生成历史搜索结果。
    /// </summary>
    private async Task<HistorySearchResult> GenerateHistorySearchResultAsync(HistorySearchRequest searchRequest, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var startTime = DateTime.UtcNow;

        var sessionResults = await GenerateProductSessionHistoryAsync(
            searchRequest.TimeRange?.StartTimeUtc ?? DateTime.UtcNow.AddDays(-7),
            searchRequest.TimeRange?.EndTimeUtc ?? DateTime.UtcNow,
            searchRequest.ProductTypeCode,
            null,
            cancellationToken);

        var layerResults = sessionResults.SelectMany(s => Enumerable.Range(1, random.Next(3, 8))
            .Select(i => new LayerProcessingHistory
            {
                LayerId = Guid.NewGuid(),
                SessionId = s.SessionId,
                LayerSequence = i,
                LayerName = $"第{i}层",
                LayerType = $"LayerType{random.Next(1, 5)}",
                LayerStatus = LayerStatus.Completed,
                LayerStartTimeUtc = s.SessionStartTimeUtc.AddMinutes(i * 10),
                LayerEndTimeUtc = s.SessionStartTimeUtc.AddMinutes(i * 10 + random.Next(30, 120)),
                DetectedPartCount = random.Next(5, 20),
                QualifiedPartCount = random.Next(4, 20),
                DefectivePartCount = random.Next(0, 5),
                LayerJudgmentResult = (LayerJudgmentResult)random.Next(0, 4),
                Defects = GenerateLayerDefects(random, i),
                ScreenshotCount = random.Next(3, 10),
                AlarmCount = random.Next(0, 3)
            })).ToList();

        var screenshotResults = sessionResults.SelectMany(s => Enumerable.Range(0, random.Next(5, 15))
            .Select(i => new ScreenshotHistory
            {
                ScreenshotId = Guid.NewGuid(),
                SessionId = s.SessionId,
                ScreenshotType = (ScreenshotType)random.Next(0, 8),
                ScreenshotTimeUtc = s.SessionStartTimeUtc.AddMinutes(random.Next(0, 120)),
                FilePath = $"/screenshots/{Guid.NewGuid():N}.jpg",
                FileSizeBytes = random.Next(100000, 5000000),
                FileFormat = "JPEG",
                ImageWidth = random.Next(1920, 4096),
                ImageHeight = random.Next(1080, 2160),
                ImageDescription = "检测截图",
                AssociatedDetectionCount = random.Next(0, 20),
                AssociatedDefectCount = random.Next(0, 5)
            })).ToList();

        var defectResults = layerResults.SelectMany(l => l.Defects).ToList();
        var operationResults = sessionResults.SelectMany(s => Enumerable.Range(0, random.Next(10, 30))
            .Select(i => new OperationHistory
            {
                OperationId = Guid.NewGuid(),
                SessionId = s.SessionId,
                OperationType = (OperationType)random.Next(0, 14),
                OperationTimeUtc = s.SessionStartTimeUtc.AddMinutes(random.Next(0, 120)),
                OperatorId = $"OP{random.Next(1, 10):D3}",
                OperatorName = $"操作员{random.Next(1, 10)}",
                OperationDescription = "操作记录",
                OperationResult = (OperationResult)random.Next(0, 6),
                OperationDurationMs = random.Next(100, 5000)
            })).ToList();

        var elapsed = DateTime.UtcNow - startTime;

        return new HistorySearchResult
        {
            SearchId = searchRequest.SearchId,
            SearchTimeUtc = searchRequest.SearchTimeUtc,
            TotalResultCount = sessionResults.Count + layerResults.Count + screenshotResults.Count + defectResults.Count + operationResults.Count,
            ReturnedResultCount = Math.Min(searchRequest.MaxResultCount, sessionResults.Count + layerResults.Count + screenshotResults.Count + defectResults.Count + operationResults.Count),
            SearchElapsedMs = (long)elapsed.TotalMilliseconds,
            SessionResults = sessionResults.Take(searchRequest.MaxResultCount / 5).ToList(),
            LayerResults = layerResults.Take(searchRequest.MaxResultCount / 5).ToList(),
            ScreenshotResults = screenshotResults.Take(searchRequest.MaxResultCount / 5).ToList(),
            DefectResults = defectResults.Take(searchRequest.MaxResultCount / 5).ToList(),
            OperationResults = operationResults.Take(searchRequest.MaxResultCount / 5).ToList(),
            SearchSuggestions = new[] { "建议1", "建议2", "建议3" },
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 80,
                ["data_source"] = "simulated"
            }
        };
    }

    /// <summary>
    /// 生成追溯数据导出。
    /// </summary>
    private async Task<(string FilePath, long FileSizeBytes, int RecordCount, ExportStatistics ExportStatistics)> GenerateTracebackExportAsync(TracebackExportRequest exportRequest, CancellationToken cancellationToken = default)
    {
        await Task.Delay(1, cancellationToken);

        var random = new Random();
        var fileName = $"traceback_export_{exportRequest.ExportId:N}.{exportRequest.ExportFormat.ToString().ToLower()}";
        var filePath = Path.Combine(Path.GetTempPath(), fileName);
        
        // 简化处理：生成模拟文件
        var recordCount = random.Next(100, 1000);
        var fileContent = GenerateExportFileContent(exportRequest, recordCount);
        await File.WriteAllTextAsync(filePath, fileContent, cancellationToken);
        
        var fileInfo = new FileInfo(filePath);
        
        var exportStatistics = new ExportStatistics
        {
            SessionCount = exportRequest.SessionIds.Count > 0 ? exportRequest.SessionIds.Count : random.Next(10, 50),
            LayerCount = random.Next(30, 200),
            ScreenshotCount = random.Next(100, 500),
            DefectCount = random.Next(0, 50),
            OperationCount = random.Next(200, 1000),
            EvidenceChainCount = exportRequest.IncludeEvidenceChain ? random.Next(10, 50) : 0
        };
        
        return (filePath, fileInfo.Length, recordCount, exportStatistics);
    }

    #endregion

    #region 辅助方法

    /// <summary>
    /// 生成层缺陷列表。
    /// </summary>
    private IReadOnlyList<LayerDefect> GenerateLayerDefects(Random random, int layerSequence)
    {
        var defects = new List<LayerDefect>();
        var defectCount = random.Next(0, 5);

        for (int i = 0; i < defectCount; i++)
        {
            defects.Add(new LayerDefect
            {
                DefectId = Guid.NewGuid(),
                DefectType = (DefectType)random.Next(0, 8),
                DefectSeverity = (DefectSeverity)random.Next(0, 4),
                DefectDescription = $"缺陷{i + 1}",
                PartName = $"部件{random.Next(1, 20)}",
                DefectPositionX = random.NextDouble() * 1000,
                DefectPositionY = random.NextDouble() * 1000,
                DefectConfidence = 0.7 + random.NextDouble() * 0.3,
                DetectionTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 60)),
                AssociatedScreenshotId = Guid.NewGuid(),
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["layer_sequence"] = layerSequence
                }
            });
        }

        return defects.AsReadOnly();
    }

    /// <summary>
    /// 生成部件检测结果。
    /// </summary>
    private IReadOnlyList<PartDetectionResult> GeneratePartDetectionResults(Random random, Guid layerId)
    {
        var results = new List<PartDetectionResult>();
        var detectionCount = random.Next(5, 20);

        for (int i = 0; i < detectionCount; i++)
        {
            results.Add(new PartDetectionResult
            {
                DetectionId = Guid.NewGuid(),
                PartName = $"部件{i + 1}",
                PartType = $"PartType{random.Next(1, 10)}",
                DetectionStatus = (PartDetectionStatus)random.Next(0, 6),
                Confidence = 0.6 + random.NextDouble() * 0.4,
                BoundingBox = new BoundingBox
                {
                    X = random.NextDouble() * 1000,
                    Y = random.NextDouble() * 1000,
                    Width = 50 + random.NextDouble() * 100,
                    Height = 50 + random.NextDouble() * 100
                },
                DetectionTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 60)),
                AssociatedScreenshotId = Guid.NewGuid(),
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["layer_id"] = layerId
                }
            });
        }

        return results.AsReadOnly();
    }

    /// <summary>
    /// 生成规则执行结果。
    /// </summary>
    private IReadOnlyList<RuleExecutionResult> GenerateRuleExecutionResults(Random random, Guid layerId)
    {
        var results = new List<RuleExecutionResult>();
        var ruleCount = random.Next(5, 15);

        for (int i = 0; i < ruleCount; i++)
        {
            results.Add(new RuleExecutionResult
            {
                ExecutionId = Guid.NewGuid(),
                RuleName = $"规则{i + 1}",
                RuleType = $"RuleType{random.Next(1, 5)}",
                ExecutionStatus = (RuleExecutionStatus)random.Next(0, 5),
                ExecutionResult = random.NextDouble() > 0.2,
                ExecutionTimeMs = random.Next(10, 1000),
                ExecutionTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 60)),
                ErrorMessage = random.NextDouble() > 0.8 ? $"规则执行错误{i + 1}" : null,
                ExecutionDetails = $"规则{i + 1}执行详情",
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["layer_id"] = layerId
                }
            });
        }

        return results.AsReadOnly();
    }

    /// <summary>
    /// 生成图像元数据。
    /// </summary>
    private ImageMetadata GenerateImageMetadata(Random random)
    {
        return new ImageMetadata
        {
            CaptureTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 120)),
            CameraId = $"CAM{random.Next(1, 5):D3}",
            CameraName = $"相机{random.Next(1, 5)}",
            ExposureTimeMs = 0.001 + random.NextDouble() * 0.1,
            ISO = random.Next(100, 3200),
            Aperture = 1.4 + random.NextDouble() * 8,
            FocalLength = 24 + random.NextDouble() * 100,
            FlashUsed = random.NextDouble() > 0.7,
            ImageQualityScore = 0.7 + random.NextDouble() * 0.3,
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 5
            }
        };
    }

    /// <summary>
    /// 生成图像标注。
    /// </summary>
    private IReadOnlyList<ImageAnnotation> GenerateImageAnnotations(Random random)
    {
        var annotations = new List<ImageAnnotation>();
        var annotationCount = random.Next(0, 10);

        for (int i = 0; i < annotationCount; i++)
        {
            annotations.Add(new ImageAnnotation
            {
                AnnotationId = Guid.NewGuid(),
                AnnotationType = (AnnotationType)random.Next(0, 8),
                AnnotationContent = $"标注{i + 1}",
                AnnotationPosition = new BoundingBox
                {
                    X = random.NextDouble() * 1000,
                    Y = random.NextDouble() * 1000,
                    Width = 50 + random.NextDouble() * 100,
                    Height = 50 + random.NextDouble() * 100
                },
                AnnotationColor = $"#{random.Next(0x1000000):X6}",
                AnnotationTimeUtc = DateTime.UtcNow.AddMinutes(-random.Next(10, 60)),
                Annotator = $"标注员{random.Next(1, 5)}",
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["annotation_index"] = i
                }
            });
        }

        return annotations.AsReadOnly();
    }

    /// <summary>
    /// 生成证据链摘要。
    /// </summary>
    private EvidenceChainSummary GenerateEvidenceChainSummary(Random random, int nodeCount)
    {
        return new EvidenceChainSummary
        {
            TotalNodeCount = nodeCount,
            CriticalNodeCount = (int)(nodeCount * (0.2 + random.NextDouble() * 0.2)),
            ScreenshotNodeCount = (int)(nodeCount * (0.3 + random.NextDouble() * 0.2)),
            DefectNodeCount = (int)(nodeCount * (0.1 + random.NextDouble() * 0.1)),
            AlarmNodeCount = (int)(nodeCount * (0.05 + random.NextDouble() * 0.05)),
            TimeSpanMinutes = 60 + random.NextDouble() * 60,
            QualityRating = (EvidenceChainQuality)random.Next(0, 5),
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 10
            }
        };
    }

    /// <summary>
    /// 生成层级回溯摘要。
    /// </summary>
    private LayerTracebackSummary GenerateLayerTracebackSummary(Random random, int linkCount)
    {
        return new LayerTracebackSummary
        {
            TotalLayerCount = linkCount,
            CompleteLinkCount = (int)(linkCount * (0.7 + random.NextDouble() * 0.2)),
            PartialLinkCount = (int)(linkCount * (0.1 + random.NextDouble() * 0.1)),
            MissingLinkCount = linkCount - (int)(linkCount * (0.7 + random.NextDouble() * 0.2)) - (int)(linkCount * (0.1 + random.NextDouble() * 0.1)),
            TotalScreenshotCount = linkCount * random.Next(3, 10),
            TotalDefectCount = random.Next(0, linkCount * 2),
            TracebackCompletenessScore = 0.7 + random.NextDouble() * 0.25,
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 8
            }
        };
    }

    /// <summary>
    /// 生成缺陷统计分析。
    /// </summary>
    private DefectStatisticsAnalysis GenerateDefectStatisticsAnalysis(Random random, int defectCount)
    {
        var defectsByType = new Dictionary<DefectType, int>();
        var defectsBySeverity = new Dictionary<DefectSeverity, int>();
        var defectsByLayer = new Dictionary<int, int>();

        for (int i = 0; i < defectCount; i++)
        {
            var type = (DefectType)random.Next(0, 8);
            var severity = (DefectSeverity)random.Next(0, 4);
            var layer = random.Next(1, 8);

            defectsByType[type] = defectsByType.GetValueOrDefault(type, 0) + 1;
            defectsBySeverity[severity] = defectsBySeverity.GetValueOrDefault(severity, 0) + 1;
            defectsByLayer[layer] = defectsByLayer.GetValueOrDefault(layer, 0) + 1;
        }

        return new DefectStatisticsAnalysis
        {
            TotalDefectCount = defectCount,
            DefectsByType = defectsByType,
            DefectsBySeverity = defectsBySeverity,
            DefectsByLayer = defectsByLayer,
            DefectDensity = defectCount > 0 ? random.NextDouble() * 10 : 0.0,
            DefectRate = defectCount > 0 ? random.NextDouble() * 5 : 0.0,
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 12
            }
        };
    }

    /// <summary>
    /// 生成缺陷模式分析。
    /// </summary>
    private DefectPatternAnalysis GenerateDefectPatternAnalysis(Random random)
    {
        var recurringPatterns = new List<DefectPattern>();
        var anomalousPatterns = new List<DefectPattern>();

        for (int i = 0; i < random.Next(0, 3); i++)
        {
            recurringPatterns.Add(new DefectPattern
            {
                PatternId = Guid.NewGuid(),
                PatternName = $"重复模式{i + 1}",
                PatternDescription = $"重复出现的缺陷模式{i + 1}",
                OccurrenceFrequency = random.NextDouble(),
                PatternConfidence = 0.6 + random.NextDouble() * 0.4,
                RelatedDefectIds = Enumerable.Range(0, random.Next(1, 5)).Select(_ => Guid.NewGuid()).ToList(),
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["pattern_type"] = "recurring"
                }
            });
        }

        for (int i = 0; i < random.Next(0, 2); i++)
        {
            anomalousPatterns.Add(new DefectPattern
            {
                PatternId = Guid.NewGuid(),
                PatternName = $"异常模式{i + 1}",
                PatternDescription = $"异常出现的缺陷模式{i + 1}",
                OccurrenceFrequency = random.NextDouble() * 0.1,
                PatternConfidence = 0.5 + random.NextDouble() * 0.3,
                RelatedDefectIds = Enumerable.Range(0, random.Next(1, 3)).Select(_ => Guid.NewGuid()).ToList(),
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["pattern_type"] = "anomalous"
                }
            });
        }

        return new DefectPatternAnalysis
        {
            RecurringPatterns = recurringPatterns.AsReadOnly(),
            AnomalousPatterns = anomalousPatterns.AsReadOnly(),
            TrendAnalysis = new DefectTrendAnalysis
            {
                TrendDirection = (TrendDirection)random.Next(0, 4),
                ChangeRate = random.NextDouble() * 10 - 5,
                TrendDescription = "缺陷趋势分析",
                PredictedNextDefectCount = random.Next(0, 10),
                Confidence = 0.6 + random.NextDouble() * 0.3,
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["generation_time_ms"] = 8
                }
            },
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 15
            }
        };
    }

    /// <summary>
    /// 生成会话性能指标。
    /// </summary>
    private SessionPerformanceMetrics GenerateSessionPerformanceMetrics(Random random)
    {
        return new SessionPerformanceMetrics
        {
            TotalProcessingTimeMinutes = 30 + random.NextDouble() * 60,
            AverageLayerProcessingTimeSeconds = 30 + random.NextDouble() * 30,
            SystemAvailability = 0.95 + random.NextDouble() * 0.04,
            ProcessingEfficiency = 0.8 + random.NextDouble() * 0.2,
            ResourceUtilization = 0.7 + random.NextDouble() * 0.25,
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 6
            }
        };
    }

    /// <summary>
    /// 生成层性能指标。
    /// </summary>
    private LayerPerformanceMetrics GenerateLayerPerformanceMetrics(Random random)
    {
        return new LayerPerformanceMetrics
        {
            LayerProcessingTimeSeconds = 30 + random.NextDouble() * 30,
            DetectionProcessingTimeMs = random.Next(100, 2000),
            RuleExecutionTimeMs = random.Next(50, 1000),
            ScreenshotProcessingTimeMs = random.Next(200, 3000),
            MemoryUsageMb = 50 + random.NextDouble() * 100,
            CpuUsagePercentage = 20 + random.NextDouble() * 60,
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 5
            }
        };
    }

    /// <summary>
    /// 生成报告执行摘要。
    /// </summary>
    private ReportExecutiveSummary GenerateReportExecutiveSummary(Random random)
    {
        return new ReportExecutiveSummary
        {
            OverallScore = 70 + random.NextDouble() * 25,
            KeyFindings = new[] { "关键发现1", "关键发现2", "关键发现3" },
            MajorIssues = new[] { "主要问题1", "主要问题2" },
            ImprovementOpportunities = new[] { "改进机会1", "改进机会2", "改进机会3" },
            SummaryDescription = "综合追溯报告执行摘要",
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 10
            }
        };
    }

    /// <summary>
    /// 生成层级分析报告。
    /// </summary>
    private IReadOnlyList<LayerAnalysisReport> GenerateLayerAnalysisReports(Random random, int layerCount)
    {
        var reports = new List<LayerAnalysisReport>();

        for (int i = 1; i <= layerCount; i++)
        {
            reports.Add(new LayerAnalysisReport
            {
                LayerSequence = i,
                LayerName = $"第{i}层",
                LayerPerformanceScore = 70 + random.NextDouble() * 25,
                LayerQualityScore = 75 + random.NextDouble() * 20,
                LayerEfficiencyScore = 65 + random.NextDouble() * 30,
                KeyMetrics = new Dictionary<string, double>
                {
                    ["处理时间"] = 30 + random.NextDouble() * 30,
                    ["检测数量"] = random.Next(5, 20),
                    ["缺陷数量"] = random.Next(0, 5)
                },
                IdentifiedIssues = new[] { $"问题{i}.1", $"问题{i}.2" },
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["generation_time_ms"] = 8
                }
            });
        }

        return reports.AsReadOnly();
    }

    /// <summary>
    /// 生成缺陷分析报告。
    /// </summary>
    private DefectAnalysisReport GenerateDefectAnalysisReport(Random random)
    {
        var defectCount = random.Next(0, 20);
        var defectsByType = new Dictionary<DefectType, int>();
        var defectsBySeverity = new Dictionary<DefectSeverity, int>();

        for (int i = 0; i < defectCount; i++)
        {
            var type = (DefectType)random.Next(0, 8);
            var severity = (DefectSeverity)random.Next(0, 4);

            defectsByType[type] = defectsByType.GetValueOrDefault(type, 0) + 1;
            defectsBySeverity[severity] = defectsBySeverity.GetValueOrDefault(severity, 0) + 1;
        }

        return new DefectAnalysisReport
        {
            TotalDefectCount = defectCount,
            DefectRate = defectCount > 0 ? random.NextDouble() * 5 : 0.0,
            DefectDistribution = defectsByType,
            SeverityDistribution = defectsBySeverity,
            HighFrequencyDefects = new List<DefectPattern>(),
            DefectTrend = new DefectTrendAnalysis
            {
                TrendDirection = (TrendDirection)random.Next(0, 4),
                ChangeRate = random.NextDouble() * 10 - 5,
                TrendDescription = "缺陷趋势分析",
                PredictedNextDefectCount = random.Next(0, 10),
                Confidence = 0.6 + random.NextDouble() * 0.3,
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["generation_time_ms"] = 8
                }
            },
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 12
            }
        };
    }

    /// <summary>
    /// 生成性能分析报告。
    /// </summary>
    private PerformanceAnalysisReport GeneratePerformanceAnalysisReport(Random random)
    {
        return new PerformanceAnalysisReport
        {
            TotalProcessingTimeMinutes = 45 + random.NextDouble() * 30,
            AverageLayerProcessingTimeSeconds = 30 + random.NextDouble() * 30,
            SystemAvailability = 0.95 + random.NextDouble() * 0.04,
            ProcessingEfficiency = 0.8 + random.NextDouble() * 0.2,
            ResourceUtilization = 0.7 + random.NextDouble() * 0.25,
            PerformanceBottlenecks = new[] { "瓶颈1", "瓶颈2" },
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 10
            }
        };
    }

    /// <summary>
    /// 生成证据链分析。
    /// </summary>
    private EvidenceChainAnalysis GenerateEvidenceChainAnalysis(Random random)
    {
        return new EvidenceChainAnalysis
        {
            EvidenceChainCompleteness = 0.8 + random.NextDouble() * 0.2,
            EvidenceChainCredibility = 0.85 + random.NextDouble() * 0.15,
            CriticalEvidenceNodes = new List<EvidenceNode>(),
            EvidenceGaps = new List<EvidenceGap>
            {
                new EvidenceGap
                {
                    GapId = Guid.NewGuid(),
                    GapType = (EvidenceGapType)random.Next(0, 7),
                    GapDescription = "证据缺口",
                    GapSeverity = (GapSeverity)random.Next(0, 4),
                    RecommendedAction = "建议措施",
                    ExtendedProperties = new Dictionary<string, object>
                    {
                        ["generation_time_ms"] = 5
                    }
                }
            },
            ExtendedProperties = new Dictionary<string, object>
            {
                ["generation_time_ms"] = 15
            }
        };
    }

    /// <summary>
    /// 生成追溯改进建议。
    /// </summary>
    private IReadOnlyList<TracebackImprovementSuggestion> GenerateTracebackImprovementSuggestions(Random random)
    {
        var suggestions = new List<TracebackImprovementSuggestion>();

        for (int i = 0; i < random.Next(3, 8); i++)
        {
            suggestions.Add(new TracebackImprovementSuggestion
            {
                SuggestionId = Guid.NewGuid(),
                SuggestionCategory = (SuggestionCategory)random.Next(0, 8),
                SuggestionTitle = $"改进建议{i + 1}",
                SuggestionDescription = $"改进建议描述{i + 1}",
                Priority = random.Next(1, 5),
                ExpectedImpact = $"预期效果{i + 1}",
                ImplementationDifficulty = (ImplementationDifficulty)random.Next(0, 4),
                RelatedEvidenceIds = Enumerable.Range(0, random.Next(1, 3)).Select(_ => Guid.NewGuid()).ToList(),
                ExtendedProperties = new Dictionary<string, object>
                {
                    ["suggestion_index"] = i
                }
            });
        }

        return suggestions.AsReadOnly();
    }

    /// <summary>
    /// 生成按日期分组的追溯统计。
    /// </summary>
    private Dictionary<DateTime, DailyTracebackStatistics> GenerateDailyTracebackStatistics(DateTime startTime, DateTime endTime, Random random)
    {
        var dailyStats = new Dictionary<DateTime, DailyTracebackStatistics>();
        var current = startTime.Date;

        while (current <= endTime.Date)
        {
            dailyStats[current] = new DailyTracebackStatistics
            {
                Date = current,
                SessionCount = random.Next(5, 20),
                CompletedSessionCount = random.Next(4, 20),
                LayerCount = random.Next(15, 100),
                ScreenshotCount = random.Next(50, 300),
                DefectCount = random.Next(0, 20)
            };

            current = current.AddDays(1);
        }

        return dailyStats;
    }

    /// <summary>
    /// 生成按产品类型分组的追溯统计。
    /// </summary>
    private Dictionary<string, ProductTypeTracebackStatistics> GenerateProductTypeTracebackStatistics(Random random)
    {
        var productTypeStats = new Dictionary<string, ProductTypeTracebackStatistics>();

        for (int i = 1; i <= 5; i++)
        {
            productTypeStats[$"PT{i}"] = new ProductTypeTracebackStatistics
            {
                ProductTypeCode = $"PT{i}",
                SessionCount = random.Next(10, 50),
                CompletedSessionCount = random.Next(8, 50),
                LayerCount = random.Next(30, 200),
                ScreenshotCount = random.Next(100, 600),
                DefectCount = random.Next(0, 50)
            };
        }

        return productTypeStats;
    }

    /// <summary>
    /// 生成导出文件内容。
    /// </summary>
    private string GenerateExportFileContent(TracebackExportRequest exportRequest, int recordCount)
    {
        var random = new Random();
        var content = new System.Text.StringBuilder();

        // 简化处理：生成CSV格式内容
        content.AppendLine("ID,时间,类型,状态,描述");
        
        for (int i = 0; i < recordCount; i++)
        {
            var timestamp = DateTime.UtcNow.AddMinutes(-random.Next(0, 1440));
            var type = exportRequest.ExportType.ToString();
            var status = "Completed";
            var description = $"记录{i + 1}";

            content.AppendLine($"{i + 1},{timestamp:yyyy-MM-dd HH:mm:ss},{type},{status},{description}");
        }

        return content.ToString();
    }

    #endregion
}
#endif

/// <summary>
/// 历史追溯服务实现（最小可编译版本）。
/// </summary>
public sealed class HistoryTraceService : IHistoryTraceService
{
    private readonly ILogger<HistoryTraceService> _logger;

    /// <summary>
    /// 构造函数。
    /// </summary>
    public HistoryTraceService(ILogger<HistoryTraceService> logger, IOptions<RuntimeOptions> options)
    {
        _logger = logger;
        _ = options;
        _logger.LogInformation("历史追溯服务已初始化（最小实现）");
    }

    public Task<Result<IReadOnlyList<ProductSessionHistory>>> GetProductSessionHistoryAsync(DateTime startTime, DateTime endTime, string? productTypeCode = null, OrpaonVision.Core.HistoryTrace.SessionStatus? sessionStatus = null, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<IReadOnlyList<ProductSessionHistory>>.Success(Array.Empty<ProductSessionHistory>()));

    public Task<Result<ProductSessionDetail>> GetSessionDetailAsync(Guid sessionId, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<ProductSessionDetail>.Success(new ProductSessionDetail()));

    public Task<Result<IReadOnlyList<LayerProcessingHistory>>> GetLayerProcessingHistoryAsync(Guid sessionId, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<IReadOnlyList<LayerProcessingHistory>>.Success(Array.Empty<LayerProcessingHistory>()));

    public Task<Result<LayerProcessingDetail>> GetLayerDetailAsync(Guid layerId, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<LayerProcessingDetail>.Success(new LayerProcessingDetail()));

    public Task<Result<IReadOnlyList<ScreenshotHistory>>> GetScreenshotHistoryAsync(Guid? sessionId = null, Guid? layerId = null, DateTime? startTime = null, DateTime? endTime = null, ScreenshotType? screenshotType = null, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<IReadOnlyList<ScreenshotHistory>>.Success(Array.Empty<ScreenshotHistory>()));

    public Task<Result<ScreenshotDetail>> GetScreenshotDetailAsync(Guid screenshotId, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<ScreenshotDetail>.Success(new ScreenshotDetail()));

    public Task<Result<byte[]>> GetScreenshotContentAsync(Guid screenshotId, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<byte[]>.Success(Array.Empty<byte>()));

    public Task<Result<EvidenceChain>> GetEvidenceChainAsync(Guid sessionId, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<EvidenceChain>.Success(new EvidenceChain()));

    public Task<Result<LayerEvidenceTraceback>> GetLayerEvidenceTracebackAsync(Guid sessionId, int? layerSequence = null, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<LayerEvidenceTraceback>.Success(new LayerEvidenceTraceback()));

    public Task<Result<DefectTraceback>> GetDefectTracebackAsync(Guid sessionId, DefectType? defectType = null, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<DefectTraceback>.Success(new DefectTraceback()));

    public Task<Result<IReadOnlyList<OperationHistory>>> GetOperationHistoryAsync(Guid? sessionId = null, string? operatorId = null, DateTime? startTime = null, DateTime? endTime = null, OperationType? operationType = null, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<IReadOnlyList<OperationHistory>>.Success(Array.Empty<OperationHistory>()));

    public Task<Result<ComprehensiveTracebackReport>> GetComprehensiveTracebackReportAsync(Guid sessionId, OrpaonVision.Core.HistoryTrace.TracebackReportType reportType, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<ComprehensiveTracebackReport>.Success(new ComprehensiveTracebackReport()));

    public Task<Result<TracebackStatistics>> GetTracebackStatisticsAsync(DateTime startTime, DateTime endTime, string? productTypeCode = null, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<TracebackStatistics>.Success(new TracebackStatistics()));

    public Task<Result<HistorySearchResult>> SearchHistoryAsync(HistorySearchRequest searchRequest, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<HistorySearchResult>.Success(new HistorySearchResult()));

    public Task<Result<TracebackExportResult>> ExportTracebackDataAsync(TracebackExportRequest exportRequest, CancellationToken cancellationToken = default)
        => Task.FromResult(Result<TracebackExportResult>.Success(new TracebackExportResult
        {
            ExportId = exportRequest.ExportId,
            IsSuccess = true,
            FilePath = string.Empty,
            FileSizeBytes = 0,
            RecordCount = 0,
            ExportElapsedMs = 0,
            ExportTimeUtc = DateTime.UtcNow,
            ResultDescription = "最小实现返回。"
        }));
}