// Copyright (c) 2015-2017 schick Informatik
// Description: Speicherobjekt für HIS-Nord Fehlermeldungen

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Xml;
using System.IO;
using System.Xml.Linq;
using log4net;

namespace bsmd.database
{

    /// <summary>
    /// Diese Klasse bildet den Verbindungsfehler der HIS-Nord Schnittstelle ab. Damit ist ein Fehler der dazwischenliegenden
    /// Kommunikationsschnittstelle gemeint, der Fehler wird nicht im NSW produziert
    /// </summary>
    public class SystemError : DatabaseEntity
    {
        private static ILog _log = LogManager.GetLogger(typeof(SystemError));

        public SystemError()
        {
            this.tablename = "[dbo].[SystemError]";
        }

        #region Enums

        public enum SystemErrorStatus
        {
            NEW,
            ACKNOWLEDGED
        };

        #endregion

        #region Properties

        public DateTime? ErrorAt { get; set; }

        public string Meldetype { get; set; }

        public string ReferenceId { get; set; }

        public int ProcessStatus { get; set; }

        public string ImportFilename { get; set; }

        public int ErrorCode { get; set; }

        public string ErrorMessage { get; set; }

        public string ErrorDescription { get; set; }
        
        public SystemErrorStatus Status { get; set; }     
        
        public Guid MessageCoreId { get; set; }

        public DateTime? SendDate { get; set; }

        public Guid? MessageHeaderId { get; set; }

        #endregion

        #region DatabaseEntity implementation

        public override List<DatabaseEntity> LoadList(IDataReader reader)
        {
            List<DatabaseEntity> result = new List<DatabaseEntity>();
            while (reader.Read())
            {
                SystemError se = new SystemError();
                se.id = reader.GetGuid(0);

                if (!reader.IsDBNull(1)) se.ErrorAt = reader.GetDateTime(1);
                if (!reader.IsDBNull(2)) se.Meldetype = reader.GetString(2);
                if (!reader.IsDBNull(3)) se.ReferenceId = reader.GetString(3);
                if (!reader.IsDBNull(4)) se.ProcessStatus = reader.GetInt32(4);
                if (!reader.IsDBNull(5)) se.ImportFilename = reader.GetString(5);
                if (!reader.IsDBNull(6)) se.ErrorCode = reader.GetInt32(6);
                if (!reader.IsDBNull(7)) se.ErrorMessage = reader.GetString(7);
                if (!reader.IsDBNull(8)) se.ErrorDescription = reader.GetString(8);
                if (!reader.IsDBNull(9)) se.MessageCoreId = reader.GetGuid(9);
                if (!reader.IsDBNull(10)) se.Status = (SystemError.SystemErrorStatus) Enum.ToObject(typeof(SystemError.SystemErrorStatus), reader.GetByte(10));
                if (!reader.IsDBNull(11)) se.MessageHeaderId = reader.GetGuid(11);

                result.Add(se);
            }
            reader.Close();
            return result;
        }

        public override void PrepareLoadCommand(IDbCommand cmd, Message.LoadFilter filter, params object[] criteria)
        {
            string query = string.Format("SELECT Id, ErrorAt, MeldeType, ReferenceId, ProcessStatus, ImportFilename, ErrorCode, ErrorMessage, ErrorDescription, MessageCoreId, Status, MessageHeaderId FROM {0} ", this.Tablename);

            switch (filter)
            {
                case Message.LoadFilter.BY_CORE:
                    query += "WHERE MessageCoreId = @COREID AND Deleted = 0";
                    ((SqlCommand)cmd).Parameters.AddWithValue("@COREID", criteria[0]);
                    break;
                case Message.LoadFilter.MESSAGEHEADER:
                    query += "WHERE MessageHeaderId = @MHID AND Deleted = 0";
                    ((SqlCommand)cmd).Parameters.AddWithValue("@MHID", criteria[0]);
                    break;
                case Message.LoadFilter.ALL:
                    query += "WHERE Deleted = 0";
                    break;
                default:
                    break;
            }

            cmd.CommandText = query;
        }

        public override void PrepareSave(IDbCommand cmd)
        {
            SqlCommand scmd = cmd as SqlCommand;

            scmd.Parameters.AddWithNullableValue("@EAT", this.ErrorAt);
            scmd.Parameters.AddWithNullableValue("@MT", this.Meldetype);
            scmd.Parameters.AddWithNullableValue("@REFID", this.ReferenceId);
            scmd.Parameters.AddWithNullableValue("@PS", this.ProcessStatus);
            scmd.Parameters.AddWithNullableValue("@IF", this.ImportFilename);
            scmd.Parameters.AddWithNullableValue("@EC", this.ErrorCode);
            scmd.Parameters.AddWithNullableValue("@EM", this.ErrorMessage);
            scmd.Parameters.AddWithNullableValue("@ED", this.ErrorDescription);
            scmd.Parameters.AddWithNullableValue("@MCID", this.MessageCoreId);
            scmd.Parameters.AddWithNullableValue("@STATUS", (byte)this.Status);
            scmd.Parameters.AddWithNullableValue("@MHID", this.MessageHeaderId);

            if (this.IsNew)
            {
                this.CreateId();
                scmd.Parameters.AddWithValue("@ID", this.Id);
                scmd.CommandText = string.Format("INSERT INTO {0} (Id, ErrorAt, MeldeType, ReferenceId, ProcessStatus, ImportFilename, ErrorCode, ErrorMessage, ErrorDescription, MessageCoreId, Status, MessageHeaderId) " +
                    "VALUES (@ID, @EAT, @MT, @REFID, @PS, @IF, @EC, @EM, @ED, @MCID, @STATUS, @MHID)", this.Tablename);
            }
            else
            {
                scmd.Parameters.AddWithValue("@ID", this.Id);
                scmd.CommandText = string.Format("UPDATE {0} SET ErrorAt = @EAT, MeldeType = @MT, ReferenceId = @REFID, ProcessStatus = @PS, ImportFilename = @IF, " +
                    "ErrorCode = @EC, ErrorMessage = @EM, ErrorDescription = @ED, MessageCoreId = @MCID, Status = @STATUS, MessageHeaderId = @MHID WHERE Id = @ID", this.Tablename);
            }
        }

        #endregion

        #region public static methods

        public static SystemError createFromXml(XElement xml)
        {
            SystemError systemError = new SystemError();
            try
            {
                if (xml.Descendants("ErrorAt").Count() > 0)
                {
                    systemError.ErrorAt = DateTime.Parse(xml.Descendants("ErrorAt").FirstOrDefault().Value);
                }

                systemError.Meldetype = xml.Descendants("Meldetype").First()?.Value;
                systemError.ReferenceId = xml.Descendants("ReferenceId").First()?.Value;
                if (xml.Descendants("ProcessStatus").Count() > 0)
                {
                    systemError.ProcessStatus = Int32.Parse(xml.Descendants("ProcessStatus").FirstOrDefault().Value);
                }

                systemError.ImportFilename = xml.Descendants("ImportFilename").FirstOrDefault()?.Value;

                if (!systemError.ImportFilename.IsNullOrEmpty())
                {
                    systemError.ImportFilename = Path.GetFileNameWithoutExtension(systemError.ImportFilename);
                    int ind = systemError.ImportFilename.IndexOf('-');
                    Guid aGuid;
                    if (Guid.TryParse(systemError.ImportFilename.Substring(ind + 1), out aGuid))
                        systemError.MessageCoreId = aGuid;
                    DateTime aDate;
                    if (DateTime.TryParse(systemError.ImportFilename.Substring(0, ind), out aDate))
                        systemError.SendDate = aDate;
                }


                if (xml.Descendants("ErrorCode").Count() > 0)
                {
                    systemError.ErrorCode = Int32.Parse(xml.Descendants("ErrorCode").First().Value);
                }

                systemError.ErrorMessage = xml.Descendants("ErrorMessage").FirstOrDefault()?.Value;
                systemError.ErrorDescription = xml.Descendants("ErrorDescription").FirstOrDefault()?.Value;


                string coreIdString = xml.Descendants("ConveyanceCode").FirstOrDefault()?.Value;

                if(!coreIdString.IsNullOrEmpty())
                {
                    Guid aCoreId;
                    if(Guid.TryParse(coreIdString, out aCoreId))
                    {
                        systemError.MessageCoreId = aCoreId;
                    } else
                    {
                        _log.WarnFormat("cannot parse conveyance code to Guid: {0}", coreIdString);
                    }                    
                }
                
            }
            catch(Exception ex)
            {
                _log.WarnFormat("Error parsing system error: {0} ERROR-XML: {1}", ex.ToString(), xml.ToString());
            }

            return systemError;
        }

        #endregion

    }
}