// Copyright (c) 2015-2017 schick Informatik
// Description:

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Media;

namespace bsmd.database
{
    public class MessageHistory : IDatabaseEntity
    {

        private const string tableName = "[MessageHistory]";

        #region Properties

        public string Tablename { get { return tableName; } }

        public Guid? Id { get; set; }

        public Guid? ReportingPartyId { get; set; }

        public ReportingParty CreatedBy { get; set; }

        public Guid EntityId { get; internal set; }

        public string EntityType { get; internal set; }

        public string EntityName { get; internal set; }

        public string EntityValues { get; internal set; }

        public DateTime Created { get; private set; }

        public int Identifier { get; set; }

        /// <summary>
        /// Helper property for display grid
        /// </summary>
        public Brush GroupColorBrush { get; set; }

        /// <summary>
        /// ENI Grid helper property
        /// </summary>
        public string ReportingPartyName
        {
            get
            {
                Dictionary<Guid, ReportingParty> repPartyDict = DBManager.Instance.GetReportingPartyDict();
                if (ReportingPartyId.HasValue && repPartyDict.ContainsKey(ReportingPartyId.Value))
                    return repPartyDict[ReportingPartyId.Value].Logon;
                return "";
            }
        }

        #endregion

        #region public methods

        internal static string GetLoadCommand()
        {
            return "SELECT Id, ReportingPartyId, EntityId, EntityType, EntityName, EntityValues, Timestamp, Identifier FROM MessageHistory WHERE EntityId = @ENTITYID ORDER BY Timestamp, Identifier";            
        }

        public object CreateObjectFromValues()
        {
            if(!this.EntityType.IsNullOrEmpty())
            {
                Type objectType = Type.GetType(this.EntityType);
                if(objectType != null)
                    return JsonConvert.DeserializeObject(this.EntityValues, objectType);
            }            
            return null;            
        }

        /// <summary>
        /// Liefert alle History-Elemente zu dem Parameter Bezugselement, wenn es ISublistElement Objekte sind
        /// Die Elemente werden über den Index gefunden.. also alles was von 1..n geht in dem Abschnitt, in dem der Benutzer
        /// einen Eintrag ausgewählt hat.
        /// </summary>
        /// <param name="allHistories"></param>
        /// <returns></returns>
        public List<DatabaseEntity> GetGroup(List<MessageHistory> allHistories)
        {
            
            LinkedList<DatabaseEntity> tmpResult = new LinkedList<DatabaseEntity>();
            DatabaseEntity refEntity = this.CreateObjectFromValues() as DatabaseEntity;

            if (refEntity is ISublistElement sublistElement)
            {
                List<MessageHistory> tmpList = new List<MessageHistory>(allHistories);
                // Alle History-Elemente einer anderen Meldeklasse ausfiltern
                tmpList.RemoveAll(aMessageHistory => !aMessageHistory.EntityId.Equals(this.EntityId));

                int selIndex = tmpList.IndexOf(this);
                tmpResult.AddLast(refEntity);
                   
                // Elemente vor dem ausgewählten Element der Linked List hinzufügen
                int indexIdentifier = Util.GetNumericIdentifier(sublistElement).Value;
                int refIdentifier = indexIdentifier;
                
                for (int tmpIndex = selIndex - 1; tmpIndex >= 0; tmpIndex--)
                {
                    DatabaseEntity prevEntity = tmpList[tmpIndex].CreateObjectFromValues() as DatabaseEntity;
                    int nextIdentifier = Util.GetNumericIdentifier((ISublistElement)prevEntity).Value;
                    if (nextIdentifier >= indexIdentifier) break;
                    indexIdentifier = nextIdentifier;
                    tmpResult.AddFirst(prevEntity);
                }

                // Elemente nach dem ausgewählten Element hinzufügen (wenn sie zur gleichen Gruppe gehören)
                if ((tmpList.Count - 1) > selIndex)
                {
                    indexIdentifier = refIdentifier;

                    for (int tmpIndex = selIndex + 2; tmpIndex < tmpList.Count; tmpIndex++)
                    {
                        DatabaseEntity nextEntity = tmpList[tmpIndex].CreateObjectFromValues() as DatabaseEntity;
                        int nextIdentifier = Util.GetNumericIdentifier((ISublistElement)nextEntity).Value;
                        if (nextIdentifier <= indexIdentifier) break;
                        indexIdentifier = nextIdentifier;
                        tmpResult.AddLast(nextEntity);                                               
                    }
                }
            }

            return new List<DatabaseEntity>(tmpResult);
        }


        #endregion

        #region IDatabaseEntity implementation

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

            // es gibt nur insert
            this.Id = Guid.NewGuid();
            scmd.Parameters.AddWithValue("@ID", this.Id);
            scmd.Parameters.AddWithNullableValue("@P1", this.ReportingPartyId);
            scmd.Parameters.AddWithValue("@P2", this.EntityId);
            scmd.Parameters.AddWithValue("@P3", this.EntityType);
            scmd.Parameters.AddWithValue("@P4", this.EntityName);
            scmd.Parameters.AddWithValue("@P5", this.EntityValues);
            scmd.Parameters.AddWithValue("@P6", DateTime.Now);
            scmd.Parameters.AddWithValue("@P7", this.Identifier);
                
            cmd.CommandText = string.Format("INSERT INTO {0} (Id, ReportingPartyId, EntityId, EntityType, " +
                    "EntityName, EntityValues, Timestamp, Identifier) VALUES (@ID, @P1, @P2, @P3, @P4, @P5, @P6, @P7)", this.Tablename);            
        }

        public void PrepareDelete(IDbCommand cmd)
        {
            SqlCommand scmd = cmd as SqlCommand;
            scmd.CommandText = string.Format("DELETE FROM {0} WHERE Id = @ID", Tablename);
            scmd.Parameters.AddWithValue("@ID", this.Id);
        }                

        public static List<MessageHistory> LoadList(IDataReader reader)
        {
            List<MessageHistory> result = new List<MessageHistory>();

            while (reader.Read())
            {
                MessageHistory mh = new MessageHistory();
                mh.Id = reader.GetGuid(0);
                if (!reader.IsDBNull(1)) mh.ReportingPartyId = reader.GetGuid(1);
                if (!reader.IsDBNull(2)) mh.EntityId = reader.GetGuid(2);
                if (!reader.IsDBNull(3)) mh.EntityType = reader.GetString(3);
                if (!reader.IsDBNull(4)) mh.EntityName = reader.GetString(4);
                if (!reader.IsDBNull(5)) mh.EntityValues = reader.GetString(5);
                if (!reader.IsDBNull(6)) mh.Created = reader.GetDateTime(6);
                if (!reader.IsDBNull(7)) mh.Identifier = reader.GetInt32(7);

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

        List<DatabaseEntity> IDatabaseEntity.LoadList(IDataReader reader)
        {
            throw new NotImplementedException();
        }

        #endregion

    }
}