Hedera.Queries = new Class({
	Extends: Hedera.Form
	
	,activate: function() {
		this.$.resultIndex.value = 0;
	}
	
	,clean: function() {
		if (this._grid) {
			this.$.gridHolder.removeChild(this._grid.node);
			this._grid.unref();
			this._grid = null;
		}
	}
	
	,onExecuteClick: function() {
		this.clean();
		
		var model = new Db.Model({
			conn: this.conn,
			query: this.$.sql.value,
			resultIndex: this.$.resultIndex.value,
			updatable: this.$.updatable.value
		});
		model.on('status-changed', this.onModelChange, this);
	}
	
	,onCleanClick: function() {
		this.clean();
	}
	
	,onModelChange: function(model, status) {
		if (status !== Db.Model.Status.LOADING) {
			model.disconnect('status-changed', this.onModelChange, this);
			model.unref();
		}

		if (status !== Db.Model.Status.READY)
			return;

		Htk.Toast.showMessage(_('Query executed!'));

		var gridHolder = this.$.gridHolder;
		
		if (gridHolder.firstChild)
			gridHolder.removeChilds(gridHolder.firstChild);

		var grid = new Htk.Grid();
		
		var columns = model.columns;
		
		for (var i = 0; i < columns.length; i++) {
			var c = columns[i];
		
			switch (c.type) {
				case Db.Conn.Type.BOOLEAN:
					var column = new Htk.ColumnCheck();
					break;
				case Db.Conn.Type.INTEGER:
					var column = new Htk.ColumnSpin();
					break;
				case Db.Conn.Type.DOUBLE:
					var column = new Htk.ColumnSpin({digits: 2});
					break;
				case Db.Conn.Type.DATE:
					var column = new Htk.ColumnDate({format: '%a, %e %b %Y'});
					break;
				case Db.Conn.Type.DATE_TIME:
					var column = new Htk.ColumnDate({format: '%a, %e %b %Y, %T'});
					break;
				case Db.Conn.Type.STRING:
				default:
					var column = new Htk.ColumnText();
			}
		
			column.setProperties({
				title: c.name,
				editable: this.$.updatable.value,
				columnIndex: i
			});
			
			grid.appendColumn(column);
		}
		
		grid.model = model;
		gridHolder.appendChild(grid.node);
		this._grid = grid;
	}
});