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using MySqlX.XDevAPI.Common;
using MySqlX.XDevAPI.CRUD;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace MySqlX.XDevAPI.Relational
{
  /// <summary>
  /// Represents a chaining table update statement.
  /// </summary>
  public class TableUpdateStatement : FilterableStatement<TableUpdateStatement, Table, Result>
  {
    internal List<UpdateSpec> updates = new List<UpdateSpec>();

    internal TableUpdateStatement(Table table) : base(table)
    {
      FilterData.IsRelational = true;
      FilterData.Parameters = new Dictionary<string, object>();
    }

    /// <summary>
    /// Executes the update statement.
    /// </summary>
    /// <returns>A <see cref="Result"/> object ocntaining the results of the update statement execution.</returns>
    public override Result Execute()
    {
      return Execute(Target.Session.XSession.UpdateRows, this);
    }

    /// <summary>
    /// Column and value to be updated.
    /// </summary>
    /// <param name="tableField">Column name.</param>
    /// <param name="value">Value to be updated.</param>
    /// <returns>This same <see cref="TableUpdateStatement"/> object.</returns>
    public TableUpdateStatement Set(string tableField, object value)
    {
      updates.Add(new UpdateSpec(Mysqlx.Crud.UpdateOperation.Types.UpdateType.Set, tableField).SetValue(value));
      SetChanged();
      return this;
    }

    /// <summary>
    /// Sets user-defined sorting criteria for the operation. The strings use normal SQL syntax like
    /// "order ASC"  or "pages DESC, age ASC".
    /// </summary>
    /// <param name="order">The order criteria.</param>
    /// <returns>A generic object that represents the implementing statement type.</returns>
    public TableUpdateStatement OrderBy(params string[] order)
    {
      FilterData.OrderBy = order;
      SetChanged();
      return this;
    }
  }
}
