using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using XP.Common.Logging.Interfaces;
using XP.ReportEngine.Configs;
using XP.ReportEngine.Interfaces;
using XP.ReportEngine.Models;

namespace XP.ReportEngine.Services
{
    /// <summary>
    /// 报告服务实现（门面）| Report service implementation (Facade)
    /// 协调报告生成的完整流程，将 UI 无关的业务逻辑封装为可复用服务
    /// Orchestrates the complete report generation workflow, encapsulating UI-independent business logic as a reusable service
    /// </summary>
    public class ReportService : IReportService
    {
        private readonly IReportGenerator _reportGenerator;
        private readonly IReportDataAdapter _dataAdapter;
        private readonly ILoggerService _logger;
        private readonly ReportIdGenerator _reportIdGenerator;
        private readonly ReportConfig _reportConfig;

        /// <summary>
        /// 生成互斥锁，防止并发渲染导致 iText7 字体对象跨文档引用错误
        /// Generation mutex to prevent concurrent rendering causing iText7 cross-document font reference errors
        /// </summary>
        private readonly SemaphoreSlim _generateLock = new(1, 1);

        /// <summary>
        /// 构造函数 | Constructor
        /// </summary>
        /// <param name="reportGenerator">报告生成器 | Report generator</param>
        /// <param name="dataAdapter">数据适配器 | Data adapter</param>
        /// <param name="logger">日志服务 | Logger service</param>
        /// <param name="reportIdGenerator">报告编号生成器 | Report ID generator</param>
        /// <param name="reportConfig">报告配置 | Report config</param>
        public ReportService(
            IReportGenerator reportGenerator,
            IReportDataAdapter dataAdapter,
            ILoggerService logger,
            ReportIdGenerator reportIdGenerator,
            ReportConfig reportConfig)
        {
            _reportGenerator = reportGenerator ?? throw new ArgumentNullException(nameof(reportGenerator));
            _dataAdapter = dataAdapter ?? throw new ArgumentNullException(nameof(dataAdapter));
            _logger = logger?.ForModule<ReportService>() ?? throw new ArgumentNullException(nameof(logger));
            _reportIdGenerator = reportIdGenerator ?? throw new ArgumentNullException(nameof(reportIdGenerator));
            _reportConfig = reportConfig ?? throw new ArgumentNullException(nameof(reportConfig));
        }

        /// <summary>
        /// 生成报告 | Generate report
        /// </summary>
        public async Task<ReportServiceResult> GenerateAsync(ReportRequest request)
        {
            if (request == null)
                throw new ArgumentNullException(nameof(request));

            // 获取互斥锁，防止并发渲染 | Acquire mutex to prevent concurrent rendering
            await _generateLock.WaitAsync();
            try
            {
                _logger.Info("报告服务开始生成 | Report service starting generation");

                // 步骤 1：生成报告编号 | Step 1: Generate report ID
                var reportId = GenerateReportId(request);
                _logger.Info("报告编号: {ReportId} | Report ID: {ReportId}", reportId);

                // 步骤 2：确定输出路径 | Step 2: Determine output path
                var outputPath = ResolveOutputPath(request, reportId);
                _logger.Info("输出路径: {Path} | Output path: {Path}", outputPath);

                // 步骤 3：数据适配 | Step 3: Data adaptation
                var metadata = request.Metadata ?? new ReportMetadata();
                if (string.IsNullOrEmpty(metadata.ReportId))
                {
                    metadata.ReportId = reportId;
                }
                if (metadata.InspectionDate == default)
                {
                    metadata.InspectionDate = DateTime.Now;
                }

                var context = _dataAdapter.Adapt(request.ProcessorOutputs ?? new List<ProcessorOutput>(), metadata);
                _logger.Info("数据适配完成 | Data adaptation completed");

                // 步骤 4：注入额外图像 | Step 4: Inject additional images
                InjectAdditionalImages(context, request);

                // 步骤 5：注入配置中的 Logo 和公司信息 | Step 5: Inject logo and company info from config
                InjectConfigData(context);

                // 步骤 6：注入自定义属性 | Step 6: Inject custom properties
                InjectCustomProperties(context, request);

                // 步骤 7：生成首页汇总表 | Step 7: Generate homepage summary table
                context.Properties["summaryTable"] = CreateSummaryTableData(context);

                // 步骤 8：调用管线生成 PDF | Step 8: Call pipeline to generate PDF
                var templatePath = _reportConfig.GetResolvedTemplatePath();
                var options = new ReportGenerationOptions
                {
                    TemplatePath = templatePath,
                    OutputFilePath = outputPath,
                    Format = ReportOutputFormat.Pdf
                };

                var genResult = await _reportGenerator.GenerateAsync(context, options);

                // 步骤 9：处理结果 | Step 9: Handle result
                if (genResult.IsSuccess)
                {
                    _logger.Info("报告生成成功: {Path} | Report generated successfully: {Path}", outputPath);
                    return ReportServiceResult.Success(outputPath, reportId);
                }
                else
                {
                    _logger.Error(null, "报告生成失败: {Message} | Report generation failed: {Message}", genResult.ErrorMessage);
                    return ReportServiceResult.Failure(genResult.ErrorMessage, genResult.Exception);
                }
            }
            catch (Exception ex)
            {
                _logger.Error(ex, "报告服务异常: {Message} | Report service exception: {Message}", ex.Message);
                return ReportServiceResult.Failure($"报告生成过程中发生异常: {ex.Message}", ex);
            }
            finally
            {
                _generateLock.Release();
            }
        }

        /// <summary>
        /// 预热报告引擎 | Warm up report engine
        /// 通过生成一个最小化的空白 PDF 来触发所有一次性初始化：
        /// iText7 程序集加载、BouncyCastle 注册、字体子系统初始化、JIT 编译
        /// </summary>
        public async Task WarmUpAsync()
        {
            // 获取互斥锁，确保预热与正式生成不并发 | Acquire mutex to ensure warm-up doesn't overlap with generation
            await _generateLock.WaitAsync();
            try
            {
                _logger.Info("报告引擎预热开始 | Report engine warm-up started");

                await Task.Run(() =>
                {
                    // 加载模板（触发 JSON 反序列化 JIT）| Load template (triggers JSON deserialization JIT)
                    var templatePath = _reportConfig.GetResolvedTemplatePath();
                    if (!File.Exists(templatePath))
                    {
                        _logger.Warn("预热跳过：模板文件不存在 {Path} | Warm-up skipped: template not found {Path}", templatePath);
                        return;
                    }

                    // 构建最小上下文 | Build minimal context
                    var context = new ReportContext
                    {
                        Metadata = new ReportMetadata
                        {
                            ReportId = "WARMUP",
                            InspectionDate = DateTime.Now,
                            SampleName = "WarmUp",
                            OperatorName = "System"
                        },
                        ResultGroups = new List<InspectionResultGroup>(),
                        Images = new Dictionary<string, ImageData>(),
                        Properties = new Dictionary<string, object>
                        {
                            ["summaryTable"] = new List<Dictionary<string, object>>()
                        }
                    };

                    var options = new ReportGenerationOptions
                    {
                        TemplatePath = templatePath,
                        OutputFilePath = null, // 不保存文件 | Don't save file
                        Format = ReportOutputFormat.Pdf
                    };

                    // 执行完整管线（触发 iText7 初始化 + 字体加载 + JIT）
                    // Execute full pipeline (triggers iText7 init + font loading + JIT)
                    var result = _reportGenerator.GenerateAsync(context, options).GetAwaiter().GetResult();

                    // 释放预热产生的流 | Dispose warm-up stream
                    result.PdfStream?.Dispose();
                });

                _logger.Info("报告引擎预热完成 | Report engine warm-up completed");
            }
            catch (Exception ex)
            {
                // 预热失败不影响正常功能 | Warm-up failure doesn't affect normal functionality
                _logger.Warn("报告引擎预热失败（不影响正常使用）| Report engine warm-up failed (doesn't affect normal usage): {Message}", ex.Message);
            }
            finally
            {
                _generateLock.Release();
            }
        }

        #region 私有方法 | Private Methods

        /// <summary>
        /// 生成报告编号 | Generate report ID
        /// 优先使用请求中已有的 ReportId，否则自动生成
        /// Prefer existing ReportId from request, otherwise auto-generate
        /// </summary>
        private string GenerateReportId(ReportRequest request)
        {
            // 如果 Metadata 中已有 ReportId，直接使用 | If Metadata already has ReportId, use it directly
            if (request.Metadata != null && !string.IsNullOrEmpty(request.Metadata.ReportId))
            {
                return request.Metadata.ReportId;
            }

            // 如果 FileNameParameters 中已有 ReportId，直接使用 | If FileNameParameters already has ReportId, use it
            if (request.FileNameParameters != null &&
                request.FileNameParameters.TryGetValue("ReportId", out var existingId) &&
                !string.IsNullOrEmpty(existingId))
            {
                return existingId;
            }

            // 自动生成 | Auto-generate
            return _reportIdGenerator.GenerateNext();
        }

        /// <summary>
        /// 解析输出文件路径 | Resolve output file path
        /// </summary>
        private string ResolveOutputPath(ReportRequest request, string reportId)
        {
            // 如果请求中指定了输出路径，直接使用 | If output path specified in request, use it directly
            if (!string.IsNullOrEmpty(request.OutputFilePath))
            {
                // 确保目录存在 | Ensure directory exists
                var dir = Path.GetDirectoryName(request.OutputFilePath);
                if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
                {
                    Directory.CreateDirectory(dir);
                }
                return request.OutputFilePath;
            }

            // 使用配置和参数自动生成路径 | Auto-generate path using config and parameters
            var fileNameParams = request.FileNameParameters ?? new Dictionary<string, string>();

            // 确保 ReportId 在参数中 | Ensure ReportId is in parameters
            if (!fileNameParams.ContainsKey("ReportId"))
            {
                fileNameParams["ReportId"] = reportId;
            }

            return _reportConfig.ResolveOutputFilePath(fileNameParams);
        }

        /// <summary>
        /// 注入额外图像到上下文 | Inject additional images into context
        /// </summary>
        private void InjectAdditionalImages(ReportContext context, ReportRequest request)
        {
            if (request.AdditionalImages == null || request.AdditionalImages.Count == 0)
                return;

            foreach (var kvp in request.AdditionalImages)
            {
                if (kvp.Value != null)
                {
                    context.Images[kvp.Key] = kvp.Value;
                    _logger.Debug("注入额外图像: {Key} | Injected additional image: {Key}", kvp.Key);
                }
            }
        }

        /// <summary>
        /// 注入配置中的 Logo 和公司信息 | Inject logo and company info from config
        /// </summary>
        private void InjectConfigData(ReportContext context)
        {
            // 注入公司名称 | Inject company name
            if (!string.IsNullOrEmpty(_reportConfig.CompanyName))
            {
                context.Properties["CompanyName"] = _reportConfig.CompanyName;
            }

            // 注入软件名称 | Inject software name
            if (!string.IsNullOrEmpty(_reportConfig.SoftwareName))
            {
                context.Properties["SoftwareName"] = _reportConfig.SoftwareName;
            }

            // 注入公司 Logo | Inject company logo
            if (!string.IsNullOrEmpty(_reportConfig.CompanyLogo))
            {
                var logoPath = Path.IsPathRooted(_reportConfig.CompanyLogo)
                    ? _reportConfig.CompanyLogo
                    : Path.Combine(AppDomain.CurrentDomain.BaseDirectory, _reportConfig.CompanyLogo);

                if (File.Exists(logoPath))
                {
                    context.Images["companyLogo"] = new ImageData
                    {
                        SourceType = ImageSourceType.FilePath,
                        FilePath = logoPath
                    };
                    _logger.Info("公司 Logo 已加载: {Path} | Company logo loaded: {Path}", logoPath);
                }
                else
                {
                    _logger.Warn("公司 Logo 文件不存在: {Path} | Company logo file not found: {Path}", logoPath);
                }
            }

            // 注入软件 Logo | Inject software logo
            if (!string.IsNullOrEmpty(_reportConfig.SoftwareLogo))
            {
                var softwareLogoPath = Path.IsPathRooted(_reportConfig.SoftwareLogo)
                    ? _reportConfig.SoftwareLogo
                    : Path.Combine(AppDomain.CurrentDomain.BaseDirectory, _reportConfig.SoftwareLogo);

                if (File.Exists(softwareLogoPath))
                {
                    context.Images["softwareLogo"] = new ImageData
                    {
                        SourceType = ImageSourceType.FilePath,
                        FilePath = softwareLogoPath
                    };
                    _logger.Info("软件 Logo 已加载: {Path} | Software logo loaded: {Path}", softwareLogoPath);
                }
                else
                {
                    _logger.Warn("软件 Logo 文件不存在: {Path} | Software logo file not found: {Path}", softwareLogoPath);
                }
            }
        }

        /// <summary>
        /// 注入自定义属性 | Inject custom properties
        /// </summary>
        private void InjectCustomProperties(ReportContext context, ReportRequest request)
        {
            if (request.CustomProperties == null || request.CustomProperties.Count == 0)
                return;

            foreach (var kvp in request.CustomProperties)
            {
                context.Properties[kvp.Key] = kvp.Value;
            }
        }

        /// <summary>
        /// 根据 ReportContext 中的结果分组生成首页汇总表数据
        /// Generate homepage summary table data from ReportContext result groups
        /// </summary>
        private List<Dictionary<string, object>> CreateSummaryTableData(ReportContext context)
        {
            var rows = new List<Dictionary<string, object>>();

            foreach (var group in context.ResultGroups)
            {
                var inspectionType = group.ProcessorType switch
                {
                    "LineMeasurementProcessor" => "线测量 | Line Measurement",
                    "BgaVoidRateProcessor" => "BGA 气泡率检测 | BGA Void Rate",
                    "VoidMeasurementProcessor" => "空隙测量 | Void Measurement",
                    "FillRateProcessor" => "通孔填锡率 | Via Fill Rate",
                    _ => group.ProcessorType
                };

                var classification = string.IsNullOrEmpty(group.Classification) ? "N/A" : group.Classification;
                var status = classification == "Pass" ? "[PASS] 合格" : classification == "Fail" ? "[FAIL] 不合格" : "—";

                rows.Add(new Dictionary<string, object>
                {
                    ["inspectionType"] = inspectionType,
                    ["classification"] = classification,
                    ["status"] = status
                });
            }

            return rows;
        }

        #endregion
    }
}