// Copyright (c) 2020-present schick Informatik
// Description: Verarbeitung von empfangenen Rückmeldungen

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Xml.Serialization;
using log4net;
using bsmd.database;

namespace bsmd.dbh
{
    internal static class ResponseUtil
    {
        private static readonly ILog _log = LogManager.GetLogger(typeof(ResponseUtil));
        private static readonly Regex _regexFilename = new Regex(@".*NSW\.DBH\.BSMD\.(.*)\.xml");

        internal static bool Read(string inputFile)
        {
            bool result = false;
            if(!inputFile.EndsWith(".xml", StringComparison.OrdinalIgnoreCase))
            {
                _log.ErrorFormat("no xml file: {0}", inputFile);
                return result;
            }

            Match m = _regexFilename.Match(inputFile);
            if(!m.Success) {             
                _log.WarnFormat("returned file doesn't follow naming convention NSW.DBH.BSMD.*:{0}", inputFile);
                return result;
            }

            string fileSeqString = m.Groups[1].Value;

            if(!Int32.TryParse(fileSeqString, out int fileSeqNum))
            {
                _log.ErrorFormat("matched file sequence number couldn't be parsed: {0}", fileSeqString);
                return result;
            }

            // load message(s?) by file seq string
            Message sentMessage = DBManager.Instance.GetMessageByFileSeqNum(fileSeqNum);
            if(sentMessage == null)
            {
                _log.ErrorFormat("cannot find a message for file sequence number {0}", fileSeqNum);
                return result;
            }

            MessageCore aCore = DBManager.Instance.GetMessageCoreById(sentMessage.MessageCoreId.Value);
            if(aCore == null)
            {
                _log.ErrorFormat("There is no core with id {0}", sentMessage.MessageCoreId.Value);
                return result;
            }

            bsmd.dbh.Response.Root root = null;

            try
            {                
                XmlSerializer serializer = new XmlSerializer(typeof(bsmd.dbh.Response.Root));                
                using (Stream s = new FileStream(inputFile, FileMode.Open))
                {
                    root = (bsmd.dbh.Response.Root) serializer.Deserialize(s);
                }

                if(Guid.TryParse(root.SenderReference, out Guid refGuid))
                {
                    if (!sentMessage.Id.Equals(refGuid))
                        _log.WarnFormat("sender ref {0} does not match sent message id {1}", refGuid, sentMessage.Id);
                } 
                else
                {
                    _log.WarnFormat("sender ref {0} is no guid", root.SenderReference);
                }

                switch(sentMessage.MessageNotificationClass)
                {
                    case Message.NotificationClass.VISIT:
                        if(root.Type == Response.RootType.VISIT)
                        {
                            if(aCore.VisitId.IsNullOrEmpty() && !root.VisitId.IsNullOrEmpty())
                            {
                                aCore.VisitId = root.VisitId;
                                _log.InfoFormat("Received Visit-Id {0} for core {1}", root.VisitId, aCore.Id);
                            }
                        }
                        break;
                    case Message.NotificationClass.TRANSIT:
                        if (root.Type == Response.RootType.TRANSIT)
                        {
                            if (aCore.TransitId.IsNullOrEmpty() && !root.TransitId.IsNullOrEmpty())
                            {
                                aCore.TransitId = root.TransitId;
                                _log.InfoFormat("Received Transit-Id {0} for core {1}", root.TransitId, aCore.Id);
                            }
                        }
                        break;
                    default:


                        break;
                }

                if (!(aCore.Cancelled ?? false))
                    aCore.BSMDStatusInternal = MessageCore.BSMDStatus.RESPONDED;

                DBManager.Instance.Save(aCore);
                result = true;
            }

            catch(Exception ex)
            {
                _log.ErrorFormat("Failed to deserialize return message: {0}", ex.Message);
                return result;
            }                        

            return result;
        }
    }
}