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

namespace FreeSql.ClickHouse.Curd
{

    class ClickHouseUpdate<T1> : Internal.CommonProvider.UpdateProvider<T1>
    {

        public ClickHouseUpdate(IFreeSql orm, CommonUtils commonUtils, CommonExpression commonExpression, object dywhere)
            : base(orm, commonUtils, commonExpression, dywhere)
        {
        }

        internal StringBuilder InternalSbSet => _set;
        internal StringBuilder InternalSbSetIncr => _setIncr;
        internal Dictionary<string, bool> InternalIgnore => _ignore;
        public override string ToSql()
        {
            return base.ToSql()?.Replace("UPDATE", "ALTER TABLE").Replace("SET", "UPDATE");
        }
        internal void InternalResetSource(List<T1> source) => _source = source;
        internal string InternalWhereCaseSource(string CsName, Func<string, string> thenValue) => WhereCaseSource(CsName, thenValue);
        internal void InternalToSqlCaseWhenEnd(StringBuilder sb, ColumnInfo col) => ToSqlCaseWhenEnd(sb, col);

        public override int ExecuteAffrows() => base.SplitExecuteAffrows(_batchRowsLimit > 0 ? _batchRowsLimit : 500, _batchParameterLimit > 0 ? _batchParameterLimit : 3000);
        public override List<T1> ExecuteUpdated() => base.SplitExecuteUpdated(_batchRowsLimit > 0 ? _batchRowsLimit : 500, _batchParameterLimit > 0 ? _batchParameterLimit : 3000);
        protected override List<T1> RawExecuteUpdated() => throw new NotImplementedException("FreeSql.ClickHouse.Custom 未实现该功能 未实现该功能");
        protected override void ToSqlCase(StringBuilder caseWhen, ColumnInfo[] primarys)
        {
            if (primarys.Length == 1)
            {
                var pk = primarys.First();
                caseWhen.Append(_commonUtils.RereadColumn(pk, _commonUtils.QuoteSqlName(pk.Attribute.Name)));
                return;
            }
            caseWhen.Append("CONCAT(");
            var pkidx = 0;
            foreach (var pk in primarys)
            {
                if (pkidx > 0) caseWhen.Append(", '+', ");
                caseWhen.Append(_commonUtils.RereadColumn(pk, _commonUtils.QuoteSqlName(pk.Attribute.Name)));
                ++pkidx;
            }
            caseWhen.Append(")");
        }
        protected override void ToSqlWhen(StringBuilder sb, ColumnInfo[] primarys, object d)
        {
            if (primarys.Length == 1)
            {
                sb.Append(_commonUtils.FormatSql("{0}", primarys[0].GetDbValue(d)));
                return;
            }
            sb.Append("concat(");
            var pkidx = 0;
            foreach (var pk in primarys)
            {
                if (pkidx > 0) sb.Append(", '+', ");
                sb.Append(_commonUtils.FormatSql("{0}", pk.GetDbValue(d)));
                ++pkidx;
            }
            sb.Append(")");
        }

#if net40
#else
        public override Task<int> ExecuteAffrowsAsync(CancellationToken cancellationToken = default) => base.SplitExecuteAffrowsAsync(_batchRowsLimit > 0 ? _batchRowsLimit : 500, _batchParameterLimit > 0 ? _batchParameterLimit : 3000, cancellationToken);
        public override Task<List<T1>> ExecuteUpdatedAsync(CancellationToken cancellationToken = default) => base.SplitExecuteUpdatedAsync(_batchRowsLimit > 0 ? _batchRowsLimit : 500, _batchParameterLimit > 0 ? _batchParameterLimit : 3000, cancellationToken);
        protected override Task<List<T1>> RawExecuteUpdatedAsync(CancellationToken cancellationToken = default) => throw new NotImplementedException("FreeSql.ClickHouse.Custom 未实现该功能 未实现该功能");
#endif
    }
}