using System;
using System.Linq;
using System.Text;

namespace SqlSugar
{
    public class DmInsertBuilder : InsertBuilder
    {
        public override string SqlTemplate
        {
            get
            {
                if (IsReturnIdentity)
                {
                    return @"INSERT INTO {0} 
           ({1})
     VALUES
           ({2}) ;select @@identity";
                }
                else
                {
                    return @"INSERT INTO {0} 
           ({1})
     VALUES
           ({2}) ;";

                }
            }
        }
        public override string SqlTemplateBatchUnion
        {
            get
            {
                return "\t\r\nUNION ALL ";
            }
        }
        public override string SqlTemplateBatch => "INSERT INTO {0} ({1})";
 
        public override string SqlTemplateBatchSelect => " {0} ";
        public override string FormatDateTimeOffset(object value)
        {
            var date = UtilMethods.ConvertFromDateTimeOffset((DateTimeOffset)value);
            return "'" + date.ToString("yyyy-MM-dd HH:mm:ss.fff zzz") + "'";
        }
        public override string ToSqlString()
        {
            var result= base.ToSqlString();
            if (!this.EntityInfo.Columns.Any(it => it.IsIdentity)&& this.IsReturnIdentity==false) 
            {
                result = result.Replace(";select @@identity", "");
            }
            if (this.IsOffIdentity)
            {
                var tableName = this.GetTableNameString;
                result = $"SET IDENTITY_INSERT {tableName} ON;" + result.TrimEnd(';') + $";SET IDENTITY_INSERT {tableName} OFF";
                result = result.Replace(";\r\n;", ";");
            }
            return result;
        }

        public override object FormatValue(object value)
        {
            if (value != null && value is DateTime)
            {
                var date = value.ObjToDate();
                if (date < UtilMethods.GetMinDate(this.Context.CurrentConnectionConfig))
                {
                    date = UtilMethods.GetMinDate(this.Context.CurrentConnectionConfig);
                }
                if (this.Context.CurrentConnectionConfig?.MoreSettings?.DisableMillisecond == true)
                {
                    return "to_date('" + date.ToString("yyyy-MM-dd HH:mm:ss") + "', 'YYYY-MM-DD HH24:MI:SS')  ";
                }
                else
                {
                    return "to_timestamp('" + date.ToString("yyyy-MM-dd HH:mm:ss.ffffff") + "', 'YYYY-MM-DD HH24:MI:SS.FF') ";
                }
            }
            else
            {
                return base.FormatValue(value);
            }
        }

        //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 => 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 =>
        //                {
        //                    object value = null;
        //                    if (it.Value is DateTime)
        //                    {
        //                        value = ((DateTime)it.Value).ToString("O");
        //                    }
        //                    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();
        //    }
        //}
    }
}