/*
	Default Interactivity
	Author: Tonio Loewald
	Date:	April 13th 2009
	Dependencies: 
			jQuery 1.3 or later
			excanvas.js r3 or later
*/

// Utility Functions
edu = {};
edu.ua = {};
edu.ua.lib = {
	baseURL: (function(){ 
			var s = document.location.toString();
			if( s.indexOf( '#' ) > 0 ){
				s = s.substr(0, s.indexOf( '#' ) );
			}
			return s;
		}()),
	root_name: function(){
			var file = edu.ua.lib.baseURL.split('/');
			if( file.length > 2 && file[file.length - 2] == 'id' ){
				file.pop();
				file.pop();
			}
			var root_name;
			while( (root_name = file.pop()) == '' ){}
			return root_name;
		},
	deep_links: {},
	update_deep_links: function(){
		var data = $.address.value();
		if( data.substr(0,1) == '/' ){
			data = data.substr(1);
		}
		data = data.split(';');
		edu.ua.lib.deep_links = {};
		for( var i in data ){
			var datum = data[i].split('=');
			if( datum.length == 2 ){
				edu.ua.lib.deep_links[ datum[0] ] = datum[1];
			}
		}
	},
	set_deep_link: function( key, value ){
		var deep_links = edu.ua.lib.deep_links;
		deep_links[ key ] = value;
		var s = '';
		for( key in deep_links ){
			if( deep_links[key] ){
				s = s + key + '=' + deep_links[key] + ';';
			}
		}
		// eliminate spurious "/" in address
		// setting strict=0 via url does not appear to work, so set it here "just in time"
		$.address.strict( false );
		$.address.value( s );
	},
	button: 0, // tracks mouse button state 
	app_path : '/mv/',
	user_path : '/',
	user_path_length : 1,
	logo:	false,
	logo_alt_text: 'UA Libraries',
	logo_click_url: 'http://www.lib.ua.edu/',
	debug: 0,
	logo_click: function(){
		window.open ( this.logo_click_url,'Information',"width=640,height=512");
	},
	toggle: function () {
		if( $(this).hasClass( 'collapsed' ) ){
			$(this).next().slideDown();
			$(this).removeClass( 'collapsed' ).addClass( 'expanded' );
		} else {
			$(this).next().slideUp();
			$(this).removeClass( 'expanded' ).addClass( 'collapsed' );
		}
	},
	expandAll : function () {
		$('#content .initiallyHidden, #content .initiallyVisible').show().prev().removeClass( 'collapsed' ).addClass( 'expanded' );
	},
	collapseAll : function () {
		$('#content .initiallyHidden, #content .initiallyVisible').hide().prev().removeClass( 'expanded' ).addClass( 'collapsed' );
	},
	print : function () {
		// this.expandAll();
		window.print();
	},
	showURL : function( url ) {
		url = this.inferRelative(url);
		if( document.location.toString() == url ){
			document.location.reload();
		} else {
			document.location = url;
		}
	},
	supportsAudio : function( type ){ 
		if( document.createElement('audio').canPlayType ){
			return !!document.createElement('audio').canPlayType( type );
		} else {
			return false;
		}
	},
	supportsVideo : function( type ){ 
		if( document.createElement('video').canPlayType ){
			return !!document.createElement('video').canPlayType( type );
		} else {
			return false;
		}
	},
	// based on code from quirksmode.org
	findPos : function( elt ){
		var curLeft = 0;
		var curTop = 0;
		if( elt.offsetParent ){
			do {
				curLeft += elt.offsetLeft;
				curTop += elt.offsetTop;
			} while ( elt = elt.offsetParent );
		}
		return { x : curLeft, y : curTop }
	},
	inferRelative : function( url ){
		if( url.substr(0, 2) == './' ){
			var prefix = '';
			var s = document.location.toString();
			if( s.substr(0,7) == 'http://' ){
				prefix = 'http://';
				s = s.substr(7);
			}
			s = s.substr(0, s.indexOf(edu.ua.lib.user_path) + edu.ua.lib.user_path_length);
			url = prefix + s + url.substr(2);
		}
		return url;
	},
	logon	: function(){
		$.getJSON(
			edu.ua.lib.inferRelative('./u/logon/' + document.log_on.name.value + '/' + MD5( edu.ua.lib.session.salt + MD5(document.log_on.password.value) ) ),
			function(data){
				if( data.error != '0' ){
					$('#log_on_feedback').slideDown( 1000 ).text('Log on FAILED');
				} else {
					$('#log_on_feedback').slideUp( 1000 );
					$('#logged_on_as').text('Welcome ' + data.user);
					$('#log_on_ui').slideUp( 1000 );
					$('#log_off_ui').slideDown( 1000 );
					if( data.admin == 'yes' ){	
						$('#admin_menu').slideDown( 1000 );
					} else {
						$('#admin_menu').hide();
					}
				}
			}
		);
	},
	logoff: function(){
		$.getJSON(
			edu.ua.lib.inferRelative('./u/logoff'),
			function(data){
				if( data.error == '0' ){
					edu.ua.lib.showURL('./');
				} else {
					alert( 'Some kind of problem occurred. You may want to try again or quit your browser. (ID = 1.)' );
				}
			}
		);
	}
}
	
// Deep Linking
$.address.change( function( event ){
	edu.ua.lib.update_deep_links();
} );

$(document).ready( function(){
	$('body').mousedown( function(e){
		edu.ua.lib.button = true;
	}).mouseup( function(){
		edu.ua.lib.button = false;
	});
	
	var s = edu.ua.lib.baseURL;
	if( s.substr( 0, 7 ) == 'http://' ){
		s = s.substr(7);
	}
	
	$.getJSON(
		edu.ua.lib.inferRelative( edu.ua.lib.user_path + 'json/session/' + s ),
		function(data){
			if( data.error == 'none' ){
				edu.ua.lib.session = data;
				$('div#breadcrumbs span').html( data.breadcrumbs );
				if( data.show_admin_panel ){
					$('div#admin_panel').show();
					if( data.logged_in ){
						$('div#logged_on_as').text( data.user );
						$('div#log_off_ui').show();
					} else {
						$('div#log_on_ui').show();
					}
					if( data.admin_privileges == 'yes' ){
						$('div#admin_menu').show();
					}
					$('div#admin_menu div.info').html( data.database_mode + ' data' );
				}
			} else {
				alert( 'Some kind of problem occurred. You may want to reload the page or restart your browser. (ID = 2.)' );
			}
		}
	);
	
	$('ul.tab_selector').mousemove( function( e ){
		// if tabs extend too far, scroll them into view proportionately
		$(this).stop();
		var p = $(this).offset();
		var last_item = $(this).children('li:last');
		var w = $(this).scrollLeft() + last_item.position().left + last_item.outerWidth();
		var x = e.clientX - p.left;
		var dx = w - $(this).innerWidth();
		if( x < 200 ){
			dx = 0;
		} else if( x > $(this).innerWidth() - 200 ){
			// we're good
		} else {
			dx *= (x - 200)/($(this).innerWidth() - 400);
		}
		$(this).animate({
			scrollLeft: dx
		}, 250);
	} ).mouseleave( function(e){
		// when mouse leaves tab area, make sure current selection is fully visible
		var current_tab = $(this).children('.selected');
		var tab_left = current_tab.position().left;
		// if the current selection is off the left side
		if( tab_left - $(this).scrollLeft() < 0 ){
			$(this).animate({
				scrollLeft: tab_left
			}, 250 );
		// if the current selection is off the right side
		} else if ( tab_left + current_tab.outerWidth() + $(this).scrollLeft() > $(this).innerWidth() ){
			$(this).animate({
				scrollLeft: tab_left + current_tab.outerWidth() + $(this).scrollLeft() - $(this).innerWidth()
			}, 250 );
		}
	} );
	
	$('ul.tab_selector li').click( function(){
		$(this).parent().children().removeClass('selected');
		$(this).addClass('selected');
	} );
	
	if( edu.ua.lib.logo ){
		$('div#content').append('<div id="logo"><a href="' + edu.ua.lib.logo_click_url + '" target="_blank"><img border="0" src="' + edu.ua.lib.logo + '" /></a></div>') ;
		$('div#logo').fadeIn( 1000 );
	} else {
		$('div#content').css('padding-top', '0.75em');
	}
	// Add toggle behavior to the sibling before each "initiallyHidden" or "initiallyVisible" object
	$(".initiallyVisible").prev().addClass( 'button' ).addClass( 'expanded' ).click( edu.ua.lib.toggle );
	$(".initiallyHidden").prev().addClass( 'button' ).addClass( 'collapsed' ).click( edu.ua.lib.toggle );
	var toggled_content = $("#content .initiallyHidden,#content .initiallyVisible").length;
	if( toggled_content ){
		$( '#global_toggles' ).slideDown( 1000 );
	}
	
	$("tr.alt_shaded:odd").css("background-color", "#eee");
	$("tr.alt_shaded:even").css("background-color", "#fff");
	
	// Add hover and active behavior to all buttons
	$(".button").hover( function() {
		$(this).addClass("buttonHover");
	}, function () {
		$(this).removeClass("buttonHover");
	}).mousedown( function() {
		$(this).addClass("buttonActive");
	}).mouseup(	function () {
		$(this).removeClass("buttonActive");
	});
	
	// Login UI
	$('#log_on_ui form').submit( edu.ua.lib.logon ); // note this does not work as of time of writing, but should?!
	$('#log_on_ui #log_in').click( edu.ua.lib.logon );
	
	// Debug Utilities
	$( 'body' ).append('<div id="debug"><div><p>Debug Info</p></div></div>');
	if( !edu.ua.lib.debug ){
		$( '#debug' ).css('display', 'none');
	}
	debug_log = function( msg ){
		if( this.lastmsg != msg ){
			$('#debug > div').prepend( msg + '<br/>' );
			this.lastmsg = msg;
		}
	}
	debug_alert = function( msg ){
		if( edu.ua.lib.debug ){
			alert( msg );
		}
	}
	
	/* Utility Math Function */
	edu.ua.lib.clamp = function( val, min, max ){
		return val < min ? min : ( val > max ? max : val );
	}
	
	edu.ua.lib.ie_version = !/chromeframe/.test(navigator.userAgent) && /MSIE (\d+\.\d+);/.test(navigator.userAgent) ? new Number(RegExp.$1) : 0 ;
});