// Interim login dialog

(function($){

	var wrap, check, next;

	function show() {

		var parent = $('#wp-auth-check'), form = $('#wp-auth-check-form'), noframe = wrap.find('.wp-auth-fallback-expired'), frame, loaded = false;

		if ( form.length ) {

			// Add unload confirmation to counter (frame-busting) JS redirects

			$(window).on( 'beforeunload.wp-auth-check', function(e) {

				e.originalEvent.returnValue = window.authcheckL10n.beforeunload;

			});

			frame = $('<iframe id="wp-auth-check-frame" frameborder="0">').attr( 'title', noframe.text() );

			frame.load( function(e) {

				var height, body;

				loaded = true;

				try {

					body = $(this).contents().find('body');

					height = body.height();

				} catch(e) {

					wrap.addClass('fallback');

					parent.css( 'max-height', '' );

					form.remove();

					noframe.focus();

					return;

				}

				if ( height ) {

					if ( body && body.hasClass('interim-login-success') )

						hide();

					else

						parent.css( 'max-height', height + 40 + 'px' );

				} else if ( ! body || ! body.length ) {

					// Catch "silent" iframe origin exceptions in WebKit after another page is loaded in the iframe

					wrap.addClass('fallback');

					parent.css( 'max-height', '' );

					form.remove();

					noframe.focus();

				}

			}).attr( 'src', form.data('src') );

			$('#wp-auth-check-form').append( frame );

		}

		wrap.removeClass('hidden');

		if ( frame ) {

			frame.focus();

			// WebKit doesn't throw an error if the iframe fails to load because of "X-Frame-Options: DENY" header.

			// Wait for 10 sec. and switch to the fallback text.

			setTimeout( function() {

				if ( ! loaded ) {

					wrap.addClass('fallback');

					form.remove();

					noframe.focus();

				}

			}, 10000 );

		} else {

			noframe.focus();

		}

	}

	function hide() {

		$(window).off( 'beforeunload.wp-auth-check' );

		// When on the Edit Post screen, speed up heartbeat after the user logs in to quickly refresh nonces

		if ( typeof adminpage != 'undefined' && ( adminpage == 'post-php' || adminpage == 'post-new-php' )

			 && typeof wp != 'undefined' && wp.heartbeat ) {

			wp.heartbeat.interval( 'fast', 1 );

		}

		wrap.fadeOut( 200, function() {

			wrap.addClass('hidden').css('display', '');

			$('#wp-auth-check-frame').remove();

		});

	}

	function schedule() {

		var interval = parseInt( window.authcheckL10n.interval, 10 ) || 180; // in seconds, default 3 min.

		next = ( new Date() ).getTime() + ( interval * 1000 );

	}

	$( document ).on( 'heartbeat-tick.wp-auth-check', function( e, data ) {

		if ( 'wp-auth-check' in data ) {

			schedule();

			if ( ! data['wp-auth-check'] && wrap.hasClass('hidden') )

				show();

			else if ( data['wp-auth-check'] && ! wrap.hasClass('hidden') )

				hide();

		}

	}).on( 'heartbeat-send.wp-auth-check', function( e, data ) {

		if ( ( new Date() ).getTime() > next )

			data['wp-auth-check'] = true;

	}).ready( function() {

		schedule();

		wrap = $('#wp-auth-check-wrap');

		wrap.find('.wp-auth-check-close').on( 'click', function(e) {

			hide();

		});

	});

}(jQuery));