/*global ajaxurl, woocommerce_term_ordering_params */

/* Modifided script from the simple-page-ordering plugin */
jQuery( function( $ ) {

	var table_selector   = 'table.wp-list-table',
		item_selector    = 'tbody tr:not(.inline-edit-row)',
		term_id_selector = '.column-handle input[name="term_id"]';

	if ( 0 === $( table_selector ).find( '.column-handle' ).length ) {
		$( table_selector ).find( 'tr:not(.inline-edit-row)' ).append( '<td class="column-handle"></td>' );

		term_id_selector = '.check-column input';
	}

	$( table_selector ).find( '.column-handle' ).show();

	$( table_selector ).sortable({
		items: item_selector,
		cursor: 'move',
		handle: '.column-handle',
		axis: 'y',
		forcePlaceholderSize: true,
		helper: 'clone',
		opacity: 0.65,
		placeholder: 'product-cat-placeholder',
		scrollSensitivity: 40,
		start: function( event, ui ) {
			if ( ! ui.item.hasClass( 'alternate' ) ) {
				ui.item.css( 'background-color', '#ffffff' );
			}
			ui.item.children( 'td, th' ).css( 'border-bottom-width', '0' );
			ui.item.css( 'outline', '1px solid #aaa' );
		},
		stop: function( event, ui ) {
			ui.item.removeAttr( 'style' );
			ui.item.children( 'td, th' ).css( 'border-bottom-width', '1px' );
		},
		update: function( event, ui ) {
			var termid     = ui.item.find( term_id_selector ).val(); // this post id
			var termparent = ui.item.find( '.parent' ).html();            // post parent

			var prevtermid = ui.item.prev().find( term_id_selector ).val();
			var nexttermid = ui.item.next().find( term_id_selector ).val();

			// Can only sort in same tree
			var prevtermparent, nexttermparent;
			if ( prevtermid !== undefined ) {
				prevtermparent = ui.item.prev().find( '.parent' ).html();
				if ( prevtermparent !== termparent) {
					prevtermid = undefined;
				}
			}

			if ( nexttermid !== undefined ) {
				nexttermparent = ui.item.next().find( '.parent' ).html();
				if ( nexttermparent !== termparent) {
					nexttermid = undefined;
				}
			}

			// If previous and next not at same tree level, or next not at same tree level and the previous is the parent of the next, or just moved item beneath its own children
			if ( ( prevtermid === undefined && nexttermid === undefined ) || ( nexttermid === undefined && nexttermparent === prevtermid ) || ( nexttermid !== undefined && prevtermparent === termid ) ) {
				$( table_selector ).sortable( 'cancel' );
				return;
			}

			// Show Spinner
			ui.item.find( '.check-column input' ).hide();
			ui.item.find( '.check-column' ).append( '<img alt="processing" src="images/wpspin_light.gif" class="waiting" style="margin-left: 6px;" />' );

			// Go do the sorting stuff via ajax
			$.post( ajaxurl, { action: 'woocommerce_term_ordering', id: termid, nextid: nexttermid, thetaxonomy: woocommerce_term_ordering_params.taxonomy }, function(response){
				if ( response === 'children' ) {
					window.location.reload();
				} else {
					ui.item.find( '.check-column input' ).show();
					ui.item.find( '.check-column' ).find( 'img' ).remove();
				}
			});

			// Fix cell colors
			$( 'table.widefat tbody tr' ).each( function() {
				var i = jQuery( 'table.widefat tbody tr' ).index( this );
				if ( i%2 === 0 ) {
					jQuery( this ).addClass( 'alternate' );
				} else {
					jQuery( this ).removeClass( 'alternate' );
				}
			});
		}
	});

});