using FastReport;
using FastReport.Export.Pdf;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Text;
using System.Timers;
using System.Web;

namespace BLL
{
    public static class FastReportService
    {
        private static Timer tempReportCleanupTimer;

        /// <summary>
        /// 重置数据
        /// </summary>
        public static void ResetData()
        {
            HttpContext.Current.Session["ReportDataTables"] = null;
            HttpContext.Current.Session["ReportParameterValues"] = null;
        }
        public static void AddFastreportTable(DataTable dataTable)
        {
            List<DataTable> dataTables = (List<DataTable>)HttpContext.Current.Session["ReportDataTables"];
            if (dataTables == null)
            {
                dataTables = new List<DataTable>();
            }
            dataTables.Add(dataTable);

            HttpContext.Current.Session["ReportDataTables"] = dataTables;
        }
        public static void AddFastreportParameter(Dictionary<string, string> Dicparames)
        {
            HttpContext.Current.Session["ReportParameterValues"] = Dicparames;

        }

        /// <summary>
        /// 启动临时报表清理定时器，定期删除超过 1 小时的 PDF。
        /// </summary>
        public static void StartTempReportCleanupMonitor()
        {
            if (tempReportCleanupTimer != null)
            {
                tempReportCleanupTimer.Stop();
                tempReportCleanupTimer.Dispose();
                tempReportCleanupTimer = null;
            }

            CleanExpiredTempReports();
            tempReportCleanupTimer = new Timer
            {
                AutoReset = true,
                Interval = 1000 * 60 * 30
            };
            tempReportCleanupTimer.Elapsed += TempReportCleanupTimer_Elapsed;
            tempReportCleanupTimer.Start();
        }

        private static void TempReportCleanupTimer_Elapsed(object sender, ElapsedEventArgs e)
        {
            CleanExpiredTempReports();
        }

        /// <summary>
        /// 删除 File/Fastreport/Temp 下创建时间超过 1 小时的 PDF 临时文件。
        /// </summary>
        public static void CleanExpiredTempReports()
        {
            try
            {
                string tempDirectory = Path.Combine(Funs.RootPath, @"File\Fastreport\Temp\");
                if (!Directory.Exists(tempDirectory))
                {
                    return;
                }

                DateTime expiredTime = DateTime.Now.AddHours(-1);
                foreach (string file in Directory.GetFiles(tempDirectory, "*.pdf", SearchOption.TopDirectoryOnly))
                {
                    FileInfo fileInfo = new FileInfo(file);
                    if (fileInfo.CreationTime < expiredTime)
                    {
                        fileInfo.Attributes = FileAttributes.Normal;
                        fileInfo.Delete();
                    }
                }
            }
            catch (Exception ex)
            {
                ErrLogInfo.WriteLog(ex, "FastReport临时报表清理", "FastReportService.CleanExpiredTempReports");
            }
        }

        /// <summary>
        /// 导出报表 PDF 到临时目录，并返回可访问的相对 URL。
        /// </summary>
        /// <param name="reportPath">报表模板路径，支持绝对路径或相对 Funs.RootPath 的路径。</param>
        public static string ExportReport(string reportPath)
        {
            List<DataTable> dataTables = (List<DataTable>)HttpContext.Current.Session["ReportDataTables"];
            Dictionary<string, string> parameterValues = (Dictionary<string, string>)HttpContext.Current.Session["ReportParameterValues"];
            return ExportReport(reportPath, dataTables, parameterValues);
        }

        /// <summary>
        /// 导出报表 PDF 到临时目录，并返回可访问的相对 URL。
        /// </summary>
        /// <param name="reportPath">报表模板路径，支持绝对路径或相对 Funs.RootPath 的路径。</param>
        /// <param name="dataTables">报表数据源集合。</param>
        /// <param name="parameterValues">报表参数集合。</param>
        public static string ExportReport(string reportPath, List<DataTable> dataTables, Dictionary<string, string> parameterValues)
        {
            string fullReportPath = GetReportFullPath(reportPath);
            if (string.IsNullOrEmpty(fullReportPath) || !File.Exists(fullReportPath))
            {
                throw new FileNotFoundException("打印模板不存在！", reportPath);
            }

            string relativeDirectory = @"File\Fastreport\Temp\";
            string tempDirectory = Path.Combine(Funs.RootPath, relativeDirectory);
            if (!Directory.Exists(tempDirectory))
            {
                Directory.CreateDirectory(tempDirectory);
            }

            string fileName = "report_" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + "_" + Guid.NewGuid().ToString("N") + ".pdf";
            string filePath = Path.Combine(tempDirectory, fileName);
            using (Report report = BuildPreparedReport(fullReportPath, dataTables, parameterValues))
            using (PDFExport pdfExport = new PDFExport())
            {
                // Web 打印先导出 PDF，前端用 iframe 装载后调用浏览器打印。
                pdfExport.PrintScaling = false;
                pdfExport.ShowPrintDialog = true;
                report.Export(pdfExport, filePath);
            }

            return "~/" + relativeDirectory.Replace("\\", "/") + fileName;
        }

        private static Report BuildPreparedReport(string reportPath, List<DataTable> dataTables, Dictionary<string, string> parameterValues)
        {
            FastReport.Utils.Config.WebMode = true;
            Report report = new Report();
            report.Load(reportPath);
            if (report.Dictionary.Connections.Count > 0)
            {
                var reportConnection = report.Dictionary.Connections[0];
                if (reportConnection.ConnectionString != Funs.ConnString)
                {
                    // 打印时只替换本次报表连接，避免把运行环境连接串写回模板文件。
                    reportConnection.ConnectionString = Funs.ConnString;
                }
            }

            if (dataTables != null && dataTables.Count > 0)
            {
                for (int i = 0; i < dataTables.Count; i++)
                {
                    report.RegisterData(dataTables[i], dataTables[i].TableName);
                }
            }

            if (parameterValues != null && parameterValues.Count > 0)
            {
                foreach (KeyValuePair<string, string> kvp in parameterValues)
                {
                    report.SetParameterValue(kvp.Key, kvp.Value);
                }
            }

            report.Prepare();
            return report;
        }

        private static string GetReportFullPath(string reportPath)
        {
            if (string.IsNullOrEmpty(reportPath))
            {
                return reportPath;
            }

            if (Path.IsPathRooted(reportPath))
            {
                return reportPath;
            }

            return Path.Combine(Funs.RootPath, reportPath.TrimStart('\\', '/'));
        }

        /// <summary>
        /// 合并报表后打印
        /// </summary>
        /// <param name="fastReportItems">报表实体集</param>
        /// <param name="path">导出的路径</param>
        public static void ExportMergeReport(List<Model.FastReportItem> fastReportItems, string path, string printType)
        {
            Report report = new Report();
            report.PrintSettings.ShowDialog = false; //隐藏弹窗
            FastReport.EnvironmentSettings settings = new EnvironmentSettings();
            settings.ReportSettings.ShowProgress = false;  //隐藏进度条
            for (int i = 0; i < fastReportItems.Count; i++)
            {
                report.Load(Funs.RootPath + fastReportItems[i].ReportPath); //加载报表

                List<DataTable> dataTables = fastReportItems[i].DataTables;
                Dictionary<string, string> ParameterValues = fastReportItems[i].ParameterValues;
                if (dataTables != null && dataTables.Count > 0)
                {
                    for (int j = 0; j < dataTables.Count; j++)
                    {
                        report.RegisterData(dataTables[j], dataTables[j].TableName);//绑定数据源
                    }
                }
                if (ParameterValues.Count > 0)
                {
                    foreach (KeyValuePair<string, string> kvp in ParameterValues)
                    {
                        report.SetParameterValue(kvp.Key, kvp.Value);//绑定参数                        
                    }
                }
                if (i == 0)
                {
                    report.Prepare();
                }
                else
                {
                    report.Prepare(true);
                }
            }
            if (printType == "1")
            {
                FastReport.Export.Pdf.PDFExport exp = new FastReport.Export.Pdf.PDFExport();
                report.Export(exp, path);
            }
            else if (printType == "2")
            {
                FastReport.Export.OoXML.Word2007Export exportBase = new FastReport.Export.OoXML.Word2007Export();
                report.Export(export: exportBase, fileName: path.Replace(oldValue: "pdf", newValue: "docx"));
            }
        }


    }
}