/**

 * Find all header rows in a thead-less table and put them in a <thead> tag.

 * This only treats a row as a header row if it contains only <th>s (no <td>s)

 * and if it is preceded entirely by header rows. The algorithm stops when

 * it encounters the first non-header row.

 *

 * After this, it will look at all rows at the bottom for footer rows

 * And place these in a tfoot using similar rules.

 * 

 * This function was copied from MediaWiki's jquery.tablesorter module

 * @param {jQuery} $table object for a <table>

 */

function emulateTHeadAndFoot( $table ) {

	var $thead, $tfoot, i, len,

		$rows = $table.find( '> tbody > tr' );

	if ( !$table.get( 0 ).tHead ) {

		$thead = $( '<thead>' );

		// T289817

		$thead.addClass('mw-sticky-header-element');

		$rows.each( function () {

			if ( $( this ).children( 'td' ).length ) {

				// This row contains a <td>, so it's not a header row

				// Stop here

				return false;

			}

			$thead.append( this );

		} );

		$table.find( ' > tbody:first' ).before( $thead );

	}

	if ( !$table.get( 0 ).tFoot ) {

		$tfoot = $( '<tfoot>' );

		len = $rows.length;

		for ( i = len - 1; i >= 0; i-- ) {

			if ( $( $rows i  ).children( 'td' ).length ) {

				break;

			}

			$tfoot.prepend( $( $rows i  ) );

		}

		$table.append( $tfoot );

	}

}



mw.hook('wikipage.content').add( function( $content ) {

	// Do this for wikitable, but sortable does it on it's own already

	$content.find('.wikitable:not(.sortable) ').each( function ( i, table ) {

		if ( table.tBodies && !table.tHead ) {

			// No thead found. Look for rows with <th>s and

			// move them into a <thead> tag or a <tfoot> tag

			emulateTHeadAndFoot( $(table).addClass('mw-sticky-header') );

		}

	} );

} );