using System.Text;

namespace Connected.Data.Schema.Sql
{
	internal class IndexDrop : TableTransaction
	{
		public IndexDrop(ObjectIndex index)
		{
			Index = index;
		}

		private ObjectIndex Index { get; }

		protected override async Task OnExecute()
		{
			switch (Index.Type)
			{
				case IndexType.Index:
					await Context.Execute(CommandText);
					break;
				case IndexType.Unique:
				case IndexType.PrimaryKey:
					await new ConstraintDrop(Index).Execute(Context);
					break;
			}
		}

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

				text.AppendLine($"DROP INDEX {Index.Name} ON {Escape(Context.Schema.SchemaName(), Context.Schema.Name)};");

				return text.ToString();
			}
		}
	}
}