using System.Text;

namespace Connected.Data.Schema.Sql
{
	internal class TableExists : SynchronizationQuery<bool>
	{
		protected override async Task<bool> OnExecute()
		{
			return (await Context.Select(CommandText)).Result;
		}

		private string CommandText
		{
			get
			{
				var text = new StringBuilder();

				text.AppendLine($"IF (EXISTS (SELECT *  FROM INFORMATION_SCHEMA.TABLES  WHERE TABLE_SCHEMA = '{Unescape(Context.Schema.SchemaName())}' AND TABLE_NAME = '{Unescape(Context.Schema.Name)}')) SELECT 1 as result ELSE SELECT 0 as result");

				return text.ToString();
			}
		}
	}
}