using System.Text;

namespace ThingsGateway.SqlSugar
{
    public class KdbndpInsertBuilder : InsertBuilder
    {
        public override string SqlTemplate
        {
            get
            {
                if (IsReturnIdentity)
                {
                    return @"INSERT INTO {0} 
           ({1})
     VALUES
           ({2}) returning $PrimaryKey";
                }
                else
                {
                    return @"INSERT INTO {0} 
           ({1})
     VALUES
           ({2}) ;";

                }
            }
        }
        public override string SqlTemplateBatch => "INSERT INTO {0} ({1})";
        public override string SqlTemplateBatchUnion => " VALUES ";

        public override string SqlTemplateBatchSelect => " {0} ";

        public override string ToSqlString()
        {
            if (IsNoInsertNull)
            {
                DbColumnInfoList = DbColumnInfoList.Where(it => it.Value != null).ToList();
            }
            var groupList = DbColumnInfoList.GroupBy(it => it.TableId).ToList();
            var isSingle = groupList.Count == 1;
            string columnsString = string.Join(",", groupList.First().Select(it => Builder.GetTranslationColumnName(it.DbColumnName)));
            if (isSingle)
            {
                string columnParametersString = string.Join(",", this.DbColumnInfoList.Select(it => base.GetDbColumn(it, Builder.SqlParameterKeyWord + it.DbColumnName)));
                return string.Format(SqlTemplate, GetTableNameString, columnsString, columnParametersString);
            }
            else
            {
                StringBuilder batchInsetrSql = new StringBuilder();
                int pageSize = 200;
                int pageIndex = 1;
                int totalRecord = groupList.Count;
                int pageCount = (totalRecord + pageSize - 1) / pageSize;
                while (pageCount >= pageIndex)
                {
                    batchInsetrSql.AppendFormat(SqlTemplateBatch, GetTableNameString, columnsString);
                    int i = 0;
                    foreach (var columns in groupList.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList())
                    {
                        var isFirst = i == 0;
                        if (isFirst)
                        {
                            batchInsetrSql.Append(SqlTemplateBatchUnion);
                        }
                        batchInsetrSql.Append("\r\n ( " + string.Join(",", columns.Select(it =>
                        {
                            if (it.InsertServerTime || it.InsertSql.HasValue() || it.SqlParameterDbType is Type || it?.PropertyType?.Name == "DateOnly" || it?.PropertyType?.Name == "TimeOnly")
                            {
                                return GetDbColumn(it, null);
                            }
                            object value = null;
                            if (it.Value is DateTime)
                            {
                                if (IsSqlServerModel())
                                {
                                    value = ((DateTime)it.Value).ToString("yyyy-MM-dd HH:mm:ss.fff");
                                }
                                else
                                {
                                    value = ((DateTime)it.Value).ToString("O");
                                }
                            }
                            else if (it.Value is DateTimeOffset)
                            {
                                return FormatDateTimeOffset(it.Value);
                            }
                            else if (IsSqlOracleModel() && it.Value is TimeSpan timeSpan)
                            {
                                return $"'{timeSpan.Days} {timeSpan.Hours:00}:{timeSpan.Minutes:00}:{timeSpan.Seconds:00}.{timeSpan.Milliseconds:000}{timeSpan.Ticks % 10000:0000}'";
                            }
                            else if (it.Value is bool && (IsMySqlModel() || IsSqlServerModel()))
                            {
                                return Convert.ToBoolean(it.Value) ? "1" : "0";
                            }
                            else
                            {
                                value = it.Value;
                            }
                            if (value == null || value == DBNull.Value)
                            {
                                return string.Format(SqlTemplateBatchSelect, "NULL");
                            }
                            return string.Format(SqlTemplateBatchSelect, "'" + value.ObjToString().ToSqlFilter() + "'");
                        })) + "),");
                        ++i;
                    }
                    pageIndex++;
                    batchInsetrSql.Remove(batchInsetrSql.Length - 1, 1).Append("\r\n;\r\n");
                }
                return batchInsetrSql.ToString();
            }
        }
        private bool IsSqlOracleModel()
        {
            return this.Context?.CurrentConnectionConfig?.MoreSettings?.DatabaseModel == DbType.Oracle;
        }
        private bool IsSqlServerModel()
        {
            return this.Context?.CurrentConnectionConfig?.MoreSettings?.DatabaseModel == DbType.SqlServer;
        }
        private bool IsMySqlModel()
        {
            return this.Context?.CurrentConnectionConfig?.MoreSettings?.DatabaseModel == DbType.MySql;
        }
        public override string FormatDateTimeOffset(object value)
        {
            var date = UtilMethods.ConvertFromDateTimeOffset((DateTimeOffset)value);
            return "'" + date.ToString("yyyy-MM-dd HH:mm:ss.fff zzz") + "'";
        }
    }
}
