using FreeSql.Internal;
using System;
using System.Collections.Generic;
using System.Data;
using System.Text;
using System.Threading.Tasks;

namespace FreeSql.Odbc.SqlServer
{

    class OdbcSqlServerDelete<T1> : Internal.CommonProvider.DeleteProvider<T1> where T1 : class
    {
        public OdbcSqlServerDelete(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere)
            : base(orm, commonUtils, commonExpression, dywhere)
        {
        }

        public override List<T1> ExecuteDeleted()
        {
            var sql = this.ToSql();
            if (string.IsNullOrEmpty(sql)) return new List<T1>();

            var sb = new StringBuilder();
            sb.Append(" OUTPUT ");
            var colidx = 0;
            foreach (var col in _table.Columns.Values)
            {
                if (colidx > 0) sb.Append(", ");
                sb.Append(_commonUtils.QuoteReadColumn(col.CsType, col.Attribute.MapType, $"DELETED.{_commonUtils.QuoteSqlName(col.Attribute.Name)}")).Append(" as ").Append(_commonUtils.QuoteSqlName(col.CsName));
                ++colidx;
            }

            var validx = sql.IndexOf(" WHERE ");
            if (validx == -1) throw new ArgumentException("找不到 WHERE ");
            sb.Insert(0, sql.Substring(0, validx));
            sb.Append(sql.Substring(validx));

            sql = sb.ToString();
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Delete, sql, dbParms);
            _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
            var ret = new List<T1>();
            Exception exception = null;
            try
            {
                ret = _orm.Ado.Query<T1>(_connection, _transaction, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfterHandler?.Invoke(this, after);
            }
            this.ClearData();
            return ret;
        }

#if net40
#else
        async public override Task<List<T1>> ExecuteDeletedAsync()
        {
            var sql = this.ToSql();
            if (string.IsNullOrEmpty(sql)) return new List<T1>();

            var sb = new StringBuilder();
            sb.Append(" OUTPUT ");
            var colidx = 0;
            foreach (var col in _table.Columns.Values)
            {
                if (colidx > 0) sb.Append(", ");
                sb.Append(_commonUtils.QuoteReadColumn(col.CsType, col.Attribute.MapType, $"DELETED.{_commonUtils.QuoteSqlName(col.Attribute.Name)}")).Append(" as ").Append(_commonUtils.QuoteSqlName(col.CsName));
                ++colidx;
            }

            var validx = sql.IndexOf(" WHERE ");
            if (validx == -1) throw new ArgumentException("找不到 WHERE ");
            sb.Insert(0, sql.Substring(0, validx));
            sb.Append(sql.Substring(validx));

            sql = sb.ToString();
            var dbParms = _params.ToArray();
            var before = new Aop.CurdBeforeEventArgs(_table.Type, _table, Aop.CurdType.Delete, sql, dbParms);
            _orm.Aop.CurdBeforeHandler?.Invoke(this, before);
            var ret = new List<T1>();
            Exception exception = null;
            try
            {
                ret = await _orm.Ado.QueryAsync<T1>(_connection, _transaction, CommandType.Text, sql, dbParms);
            }
            catch (Exception ex)
            {
                exception = ex;
                throw ex;
            }
            finally
            {
                var after = new Aop.CurdAfterEventArgs(before, exception, ret);
                _orm.Aop.CurdAfterHandler?.Invoke(this, after);
            }
            this.ClearData();
            return ret;
        }
#endif
    }
}