using log4net;
using OT.COM.ArsenalDB;
using System;
using System.Diagnostics;
using System.IO;

namespace CounsellorBL
{
    public static class ReportExtension
    {
        private static ILog _inst = null;
        private static ILog Logger
        {
            get
            {
                if (_inst == null)
                {
                    _inst = LogManager.GetLogger(typeof(ReportExtension));
                }
                return _inst;
            }
        }

        /// <summary>
        /// 轉換為Pdf
        /// </summary>
        /// <param name="timeout">轉換逾時秒數</param>
        /// <param name="tmpFileFullPath">檔案路徑</param>
        /// <returns></returns>
        public static string ConvertToPdf(int timeout, string tmpFileFullPath, out string pdfFileFullPath)
        {
            // 經由轉換程式處理
            var pdfProcess = new Process();
            pdfProcess.StartInfo.FileName = CustomizeDBMgr.SettingData["PdfConverterFileName"];
            // LibreOffice有bug，如果路徑用"\"無法判別，必須改用"/"，例如"C:\ABC\"要用"C:/ABC/"
            pdfProcess.StartInfo.Arguments = string.Format(CustomizeDBMgr.SettingData["PdfConverterArguments"], 
                tmpFileFullPath.Replace('\\', '/'), 
                Path.GetDirectoryName(tmpFileFullPath).Replace('\\', '/'));
            pdfProcess.StartInfo.CreateNoWindow = false;
            pdfProcess.StartInfo.UseShellExecute = false;
            Logger.Info("FileName:"+pdfProcess.StartInfo.FileName+ " "+ pdfProcess.StartInfo.Arguments);
            try
            {
                // PDF開始轉換的時間
                var startConvertTime = DateTime.Now;
                pdfProcess.Start();

                if (pdfProcess.WaitForExit(timeout * 1000))   // 逾時秒數
                {
                    // 取回PDF資料
                    pdfFileFullPath = Path.ChangeExtension(tmpFileFullPath, ".pdf");
                    var duration = DateTime.Now - startConvertTime;
                    //Logger.InfoFormat("轉換PDF [{0}] 花費 {1:n2} 秒 ({2:n2} 毫秒)", pdfFileFullPath, duration.TotalSeconds, duration.TotalMilliseconds);

                    // 因為lag關係，可能要等一段時間檔案才會真正產生
                    // 增加一點等待時間
                    for (var retry = 0; retry < 10; retry++)
                    {
                        var exist = File.Exists(pdfFileFullPath);
                        if (exist)
                        {
                            return null;   // 回傳null算正確
                        }
                        System.Threading.Thread.Sleep(200);
                    }
                    // 等候太久，回傳失敗
                    Logger.Error("無法取回PDF " + pdfFileFullPath);
                    return "轉換逾時,無法取回PDF";
                }
                else
                {
                    // 等候太久，可能是轉換失敗
                    Logger.Error("轉換PDF逾時 " + tmpFileFullPath);
                    pdfFileFullPath = null;
                    return "轉換逾時";
                }
            }
            catch (Exception e)
            {
                Logger.Error("轉換PDF發生錯誤", e);
                pdfFileFullPath = null;
                return "轉換PDF時發生錯誤" + e.Message;
            }
            finally
            {
                pdfProcess.Dispose();
            }
        }
    }
}