function Schedule(options) {
    var schedule = {};

    schedule.init = function(options) {
        // TODO: make these configurable, passed in as options
        // when you create a Schedule() instance on the page
        schedule.sourceJSON = 'sessions.json';
        schedule.spacesJSON = 'spaces.json';
        schedule.pathwaysJSON = 'pathways.json';
        schedule.$container = $('#schedule');
        schedule.$toggles = $('<ul>').appendTo('#schedule-controls');
        schedule.$pageLinks = $('#page-links');
        // if true, avoids using history.back(), which doesn't work offline
        schedule.offlineMode = false;

        // TODO: determine list of unique tab names and dates
        // after loadSessions() gets actual session data
        schedule.tabList = [
            { name: 'Friday', displayName: 'Fri', tabDate: new Date(2015,10,6) },
            { name: 'Saturday', displayName: 'Sat', tabDate: new Date(2015,10,7) },
            { name: 'Sunday', displayName: 'Sun', tabDate: new Date(2015,10,8) },
            { name: 'All', displayName: 'All' }
        ];
        schedule.sessionList = [];
        schedule.spaceMetaList = [];
        schedule.pathwayMetaList = [];
        schedule.pathwayMap = [];
        // check for saved sessions in localStorage. Because localStorage only
        // takes strings, split on commas so we get an array of session IDs
        if (Modernizr.localstorage) {
            localStorage['mozfest2015_saved_sessions'] = localStorage['mozfest2015_saved_sessions'] || '';
            schedule.savedSessionIDs = _.compact(localStorage['mozfest2015_saved_sessions'].split(',')) || [];
        }

        // add UI elements
        schedule.addListeners();
        schedule.addToggles();

        // set chosenTab to tab matching today's date if possible
        schedule.getChosenTab();

        // fetch data and display it
        schedule.load();
    }

    // determine what data to show on initial pageload
    schedule.load = function() {
        // if there's a hash, someone is loading a specific session or tab
        if (!window.location.hash) {
            // if no hash, just load the base schedule
            schedule.makeSchedule();
        } else {
            // otherwise determine relevant detail page and call route()
            var hashArray = window.location.hash.substring(1).split(/-(.+)?/);
            schedule.route(hashArray[0], hashArray[1]);
        }
    }

    // this is a single page app, and route() functions like a URL router
    schedule.route = function(pageType, pageID) {
        // currently this app supports two types of detail pages:
        // 1) _session (which gets a detail page for a given session)
        // 2) _show (which gets a session list for a specific tab)
        switch(pageType) {
            case "_session":
                // get session details based on ID value from the URL
                schedule.getSessionDetail(pageID);
                break;
            case "_show":
                // set chosenTab to ID value from URL, then get session list
                schedule.chosenTab = pageID;
                schedule.makeSchedule();
                break;
            case "_spaces":
                // shows list of Spaces and their description
                schedule.displaySpacesList();
                break;
            case "_space":
                // show sessions in a space based on space slug in URL
                schedule.displaySessionsOfSpace(pageID);
                break;
            case "_pathways": 
                // shows list of all pathways
                schedule.displayPathwaysList();
                break;
            case "_pathway":
                // show sessions in a pathway based on pathway slug in URL
                schedule.getFilteredSessions("pathways", pageID);
                break;
        }
    }

    // call makeSchedule() to display the selected list of sessions
    schedule.makeSchedule = function() {
        schedule.loadChosenTab();
    }

    // loadSessions() gets session data and sorts it for display. Checks
    // for local data first, then falls back to ajax call to sourceJSON file.
    // An optional callback function can be passed in.
    schedule.loadSessions = function(callback) {
        if (schedule.sessionList.length) {
            // if the app already has collected session data,
            // make sure it's sorted, then fire the callback
            schedule.sortSessionGroups(schedule.sessionList);
            if (callback) {
                callback();
            }
        } else {
            // if there's no session data yet, fetch from JSON
            $.getJSON(schedule.sourceJSON, function() {
                    // temporarily show loading text
                    $('.open-block').html('<span class="loading">LOADING SCHEDULE DATA <span>.</span><span>.</span><span>.</span></span>');
                })
                .done(function(results) {
                    $('.open-block').text('OPEN');
                    schedule.sortSessionGroups(results);
                    // update savedSessionList with any new data
                    schedule.updateSavedSessionList();
                    if (callback) {
                        callback();
                    }
                });
        }
    }

    // loadSpaces() gets Spaces meta data and sorts it for display. Checks
    // for local data first, then falls back to ajax call to spacesJSON file.
    // An optional callback function can be passed in.
    schedule.loadSpaces = function(callback) {
        if (schedule.spaceMetaList.length) {
            // if the app already has collected Spaces meta data, fire the callback
            if (callback) {
                callback();
            }
        } else {
            // if there's no Spaces meta data yet, fetch from JSON
            $.getJSON(schedule.spacesJSON)
                .done(function(results) {
                    schedule.spaceMetaList = results;
                    if (callback) {
                        callback();
                    }
                });
        }
    }

    // loadPathways() gets Pathways meta data and sorts it for display. Checks
    // for local data first, then falls back to ajax call to loadPathways file.
    // An optional callback function can be passed in.
    schedule.loadPathways = function(callback) {
        if (schedule.pathwayMetaList.length) {
            // if the app already has collected Pathways meta data, fire the callback
            if (callback) {
                callback();
            }
        } else {
            // if there's no Pathways meta data yet, fetch from JSON
            $.getJSON(schedule.pathwaysJSON)
                .done(function(results) {
                    schedule.pathwayMetaList = results;
                    if (callback) {
                        callback();
                    }
                });
        }
    }


    // sortSessionGroups() performs basic sorting so session lists
    // are rendered in proper order
    // TODO: pass in a sorting function rather than hard-code it here
    schedule.sortSessionGroups = function(data) {
        schedule.sessionList = _.sortBy(data, function(i) {
            // simple way to divide sessions into groups by length
            return i.length != '1 hour';
        });
        schedule.getPathwaysCountMap();
    }

    // writeSession() renders session data into a template fragment.
    // Can be called during loops to render out an entire list
    schedule.writeSession = function(targetBlock, templateData, template) {
        if (!template) {
            // default to "card" display for tappable list items
            var template = schedule.sessionCardTemplate
        }
        // remove any placeholder blocks (in the "Favorites" tab)
        targetBlock.find('.open-block').remove();
        // add session information to the page
        targetBlock.append(template(templateData));
    }
    
    // remove all placeholder "Open" blocks on page
    schedule.clearOpenBlocks = function() {
        var openBlocks = schedule.$container.find('.open-block').parent();
        openBlocks.prev('h3').remove();
        openBlocks.remove();
    }

    // prepares session data to be rendered into a template fragment
    schedule.makeSessionItemTemplateData = function(sessionItem, expanded) {
        var templatedata = {
            session: sessionItem,
            sessionID: sessionItem.id,
            sessionClass: sessionItem.everyone ? 'everyone' : sessionItem.length == '1 hour' ? 'length-short' : 'length-long',
            showDay: false,
            showFacilitators: true,
            smartypants: schedule.smartypants
        }
        // some templates need to show expanded data
        if (expanded) {
            templatedata.showDay = true;
            templatedata.showFacilitators = true;
        }

        return templatedata;
    }

    // addSessionsToSchedule() will take a list of session objects
    // and write them all onto the page
    schedule.addSessionsToSchedule = function(sessionList) {
        // pass in a subset of sessions manually,
        // or fall back to schedule.sessionList
        var sessionList = sessionList || schedule.sessionList;

        var visibleIDs = $('.page-block:visible').map(function() {
            return this.id;
        })
        var visibleSessionList = _.filter(sessionList, function(s) {
            return _.contains(visibleIDs, s.scheduleblock)
        })

        _.each(visibleSessionList, function(v, k) {
            // find the correct schedule block on the page for this session
            var targetBlock = $('#'+v.scheduleblock);
            // prep the session data for the template
            var templateData = schedule.makeSessionItemTemplateData(v);
            // render it in
            schedule.writeSession(targetBlock, templateData);

            // for long sessions, which span both halves of a schedule block,
            // add "ghost" version to the second half of the block
            if (v.length == '2.5 hours') {
                templateData.sessionID += '-ghost';
                templateData.sessionClass += ' session-ghost';

                var targetBlock = $('#'+v.scheduleblock.replace('-1','-2'));
                schedule.writeSession(targetBlock, templateData);
            }
        });

        // add "fav" star controls to all session items on the page
        schedule.addStars('.session-list-item');

        // run the callback after adding all available sessions.
        schedule.addBlockToggles();
    }

    // showSessionDetail() renders session data into the detail template,
    // including full session description, etc.
    schedule.showSessionDetail = function() {
        // when user taps a session to see details, the ID is stored
        // in the sessionID variable. Use that to fetch data from sessionList
        var session = _.find(schedule.sessionList, function(i) {
            return i.id == schedule.sessionID;
        })

        if (session) {
            // if sessionList has a session matching chosen ID, render it
            var templateData = {
                session: session,
                slugify: schedule.slugify, // context function for string-matching
                smartypants: schedule.smartypants // context function for nice typography
            }

            // turn facilitator_array into array of individual facilitator objects
            templateData.session.facilitator_array = _.map(session.facilitator_array, function(facilitator) {
                var metaArray = facilitator.split(",");
                var meta = {
                    name: metaArray.splice(0,1),
                    description: ""
                };
                var otherMeta = _.each(metaArray, function(value) {
                    if (value.indexOf("@") > -1) {
                        meta.twitter = schedule.trim(value);
                    } else {
                        meta.description += schedule.trim(value);
                    }
                });
                return meta;
            })

            // add pathway array for individual links
            templateData.session.pathwayArray = _.each(session.pathways.split(','), function(i) {
                schedule.trim(i);
            })

            // clear currently highlighted tab/page link
            schedule.clearHighlightedPage();

            schedule.$container.html(schedule.sessionDetailTemplate(templateData));
            // allowing faving from detail page too
            schedule.addStars('.session-detail');
        } else {
            // if no matching ID found, just make a full session list
            schedule.makeSchedule();
        }
    }

    // utility function to clean up element that held session detail
    schedule.clearSessionDetail = function() {
        $('#session-detail-wrapper').remove();
    }

    // call getSessionDetail() when you have a sessionID value, but you
    // can't be sure that the app has loaded session data. E.g. initial
    // pageload goes directly to a session detail view
    schedule.getSessionDetail = function(sessionID) {
        // store sessionID in case we need it later
        schedule.sessionID = sessionID;

        if (schedule.sessionList.length) {
            // if the data's loaded, render the detail page
            schedule.showSessionDetail();
        } else {
            // otherwise fetch data and pass showSessionDetail() as callback
            schedule.loadSessions(schedule.showSessionDetail);
        }
    }

    // this is a single-page app, and updateHash() helps track state
    schedule.updateHash = function(value) {
        var baseURL = window.location.href.replace(window.location.hash, '');
        var newURL = (!!value) ? baseURL + "#_" + value : baseURL;

        window.history.pushState(value, "", newURL);
        // make sure we *have* a window.history before we try to manipulate it
        window.history.ready = true;
    }

    // utility function to make sure transitions are the same across functions
    schedule.transitionElementIn = function(element, callback) {
        element.fadeIn(50, function() {
            if (callback) {
                callback();
            }
        });
    }

    // add fav stars that tap to store session ID values in localStorage
    schedule.addStars = function(containerClass) {
        if (Modernizr.localstorage) {
            $(containerClass+':not(.session-everyone)').append('<span class="favorite"><i class="fa fa-heart-o"></i></span>');
            // if any sessions have been faved, make sure their star is lit
            _.each(schedule.savedSessionIDs, function(i) {
                $('[data-session="' + i + '"]').find('.favorite').addClass('favorite-active');
            })
        }
    }
    
    // add icons for collapsible scheduleblocks
    schedule.addBlockToggles = function() {
        var blocks = schedule.$container.find('.page-block:visible');
        blocks.prev('h3').addClass('slider-control').append('<i class="fa fa-chevron-circle-down"></i>');
        blocks.addClass('slider');
        schedule.calculateBlockHeights(blocks);
        schedule.$container.find('.page-caption').append('<a href="#" id="slider-collapse-all" class="page-control" data-action="collapse">Hide all sessions</a>');
    }

    // calculate and store block heights for animations
    schedule.calculateBlockHeights = function(blocks) {
        var blocks = blocks || schedule.$container.find('.page-block');
        _.each(blocks, function(b) {
            var block = $(b);
            var blockHeight = block.height()+'px';
            block.attr('data-max-height', blockHeight).css('max-height', blockHeight);
        });
    }
    
    // add a set of tabs across the top of page as toggles that change display
    schedule.addToggles = function() {
        if (Modernizr.localstorage) {
            // only add "Favorites" tab if browser supports localStorage
            schedule.tabList.splice(schedule.tabList.length-1, 0, { name: 'Favorites', displayName: '<i class="fa fa-heart"></i>' });
        }

        // set toggle width as percentage based on total number of tabs
        var toggleWidth = (1 / schedule.tabList.length) * 100;

        // add the toggle links
        _.each(schedule.tabList, function(tab) {
            schedule.$toggles.append(
                $('<li>').css('width', toggleWidth+'%').append(
                    $('<a>').html(tab.displayName).attr('href', '#').attr('id', 'show-'+tab.name.toLowerCase())
                )
            );
        });
    }

    // getChosenTab() sets value of chosenTab if none exists, likely because
    // the app is just being loaded. Show "today's" tab if possible
    schedule.getChosenTab = function() {
        if (!schedule.chosenTab) {
            var today = new Date().toDateString();
            var favoredTab = _.find(schedule.tabList, function(i) {
                return (!i.tabDate) ? false : i.tabDate.toDateString() == today
            })

            if (favoredTab) {
                // if we can match today's date, show it by default
                schedule.chosenTab = favoredTab.name.toLowerCase();
            } else {
                // otherwise show contents of first tab in the list
                schedule.chosenTab = schedule.tabList[0].name.toLowerCase();
            }
        }
    }

    // given a JSON key name `filterKey`, find session objects with values
    // that contain the string `filterValue`. This is a substring comparison
    // based on slugified versions of key and value, e.g. "my-great-pathway"
    schedule.getFilteredSessions = function(filterKey, filterValue) {
        schedule.filterKey = filterKey || schedule.filterKey;
        schedule.filterValue = filterValue || schedule.filterValue;

        if (!schedule.sessionList.length) {
            // this is first page load so fetch session data
            schedule.loadSessions(schedule.showFilteredSessions);
        } else {
            schedule.showFilteredSessions();
        }
    }
    schedule.showFilteredSessions = function() {
        schedule.clearHighlightedPage();

        if (!!schedule.filterKey) {
            schedule.filteredList = _.filter(schedule.sessionList, function(v, k) {
                return (schedule.slugify(v[schedule.filterKey]).indexOf(schedule.slugify(schedule.filterValue)) >= 0);
            });
        }

        schedule.$container.html(schedule.sessionListTemplate);
        schedule.addCaptionOverline("<h2>" + schedule.filterKey + ": " + schedule.filterValue.replace(/-/g," ") + "</h2>");
        schedule.addSessionsToSchedule(schedule.filteredList);
        schedule.clearOpenBlocks();
    }

    // based on the value of chosenTab, render the proper session list
    schedule.loadChosenTab = function() {
        // clear currently highlighted tab/page link
        // and make sure the selected tab is lit
        schedule.clearHighlightedPage();
        $('#show-'+schedule.chosenTab).addClass('active');

        if (schedule.chosenTab == 'favorites') {
            // "favorites" class changes display of session items
            schedule.$container.removeClass().addClass('favorites');
            if (schedule.savedSessionList) {
                // if the app has session data, render the favorites list
                schedule.showFavorites();
            } else {
                // otherwise load session data and pass showFavorites() as callback
                schedule.loadSessions(schedule.showFavorites);
            }
        } else if (schedule.chosenTab == 'all') {
            schedule.$container.removeClass().addClass('all-sessions');
            // loadSessions() is safe to call no matter what because it knows
            // to look for local session data before calling for json
            schedule.loadSessions(schedule.showFullSessionList);
        } else {
            // handle standard tabs like "Thursday" or "Friday"
            schedule.$container.html(schedule.sessionListTemplate);
            schedule.$container.find('.schedule-tab').hide();
            $('#'+schedule.chosenTab).show();
            schedule.addCaptionOverline();
            schedule.loadSessions(schedule.addSessionsToSchedule);
        }
    }

    // the list view is treated differently than normal tabs that have "cards"
    // to tap on. This shows expanded data, and includes search/filtering
    schedule.showFullSessionList = function() {
        schedule.$container.empty();
        schedule.addListControls();

        // exclude "everyone" sessions like lunch, dinner, etc.
        var fullList = _.reject(schedule.sessionList, function(i) {
            return i.everyone;
        });
        // sort the data by session name, not by schedule time
        fullList = _.sortBy(fullList, function(i) {
            return i.title;
        });

        // render the list
        _.each(fullList, function(v, k) {
            var templateData = schedule.makeSessionItemTemplateData(v, true);
            schedule.writeSession(schedule.$container, templateData, schedule.sessionListItemTemplate);
        });

        // add fav stars
        schedule.addStars('.session-list-item');
    }

    // provide some user instructions at top of page
    schedule.addCaptionOverline = function(captionHTML) {
        schedule.$container.prepend("<div class='page-caption'></div>");
        schedule.$container.find('.page-caption').html(captionHTML);
    }

    schedule.clearHighlightedPage = function() {
        // clear currently highlighted tab (if any) from "schedule-controls"
        schedule.$toggles.find('a').removeClass('active');
        // clear highlighted page link (if any) from "page-links" on the nav bar
        schedule.$pageLinks.find('a').removeClass('active');
    }

    // adds search filter and expanded data toggle to top of "All" sessions list
    schedule.addListControls = function() {
        schedule.addCaptionOverline();

        var filterForm = '<div id="filter-form">\
                <label for="list-filter">Search speakers, tracks, and descriptions:</label>\
                <input class="filter" type="text" id="list-filter" />\
            </div>';
        $(filterForm).appendTo(schedule.$container);

        var expand = $('<a id="show-descriptions" class="page-control" data-action="show" href="#"><i class="fa fa-plus-circle"></i> Show descriptions</a>').appendTo(schedule.$container);

        var filteredList = $('#schedule');
        // watch search input for changes, and filter the session list accordingly
        $('#list-filter').change(function() {
            var filterVal = $(this).val();
            if (filterVal) {
                // compare current value of search input across session data,
                // matching against titles, session leader names, descriptions,
                // pathways and spaces
                var filteredSessions = _.filter(schedule.sessionList, function(v, k) {
                    return (v.title.toUpperCase().indexOf(filterVal.toUpperCase()) >= 0)
                           || (v.facilitators.toUpperCase().indexOf(filterVal.toUpperCase()) >= 0)
                           || (v.pathways.toUpperCase().indexOf(filterVal.toUpperCase()) >= 0)
                           || (v.space.toUpperCase().indexOf(filterVal.toUpperCase()) >= 0)
                           || (v.description.toUpperCase().indexOf(filterVal.toUpperCase()) >= 0);
                });
                // get the IDs of the matching sessions ...
                var filteredIDs = _.pluck(filteredSessions, 'id');

                // ... temporarily hide all the sessions on the page ...
                $('.session-list-item').hide()
                $('.session-description').hide();
                // ... and then show matching sessions, including description
                _.each(filteredIDs, function(i) {
                    $('#session-'+i).show().find('.session-description').show();
                })
                // because we're showing descriptions, hide the "expand" toggle
                expand.hide();
            } else {
                // no value in search input, so make sure all items are visible
                $('.session-description').hide();
                filteredList.find('.session-list-item').css('display','block');
                // show the "expand" toggle
                expand.show();
            }

            // show "no results" if search input value matches zero items
            if ($('.session-list-item:visible').length == 0) {
                $('#no-results').remove();
                $('#filter-form label').after('<p id="no-results">No matching results found.</p>');
            } else {
                $('#no-results').remove();
            }
            return false;
        }).keyup(function() {
            $(this).change();
        });
    }

    // showFavorites() handles display when someone chooses the "Favorites" tab
    schedule.showFavorites = function() {
        // provide some user instructions at top of page
        schedule.$container.empty().append('<p class="overline">Favorite sessions to store a list on this device</p>').append(schedule.sessionListTemplate);
        // use savedSessionList IDs to render favorited sessions to page
        schedule.addSessionsToSchedule(schedule.savedSessionList);
        schedule.clearOpenBlocks();
    }

    // uses savedSessionIDs list to compile data for favorited sessions
    schedule.updateSavedSessionList = function() {
        schedule.savedSessionList = _.filter(schedule.sessionList, function(v, k) {
            // by default include "everyone" sessions on favorites list
            // just to make temporal wayfinding easier
            return (v.space == 'Everyone') || _.contains(schedule.savedSessionIDs, v.id);
        });
    }

    // display the list of Spaces and their descriptions
    schedule.displaySpacesList = function() {
        schedule.clearHighlightedPage();
        schedule.$pageLinks.find('#spaces-page-link').addClass('active');
        schedule.$container.html("");
        schedule.addCaptionOverline("<h3><span>Tracks</span></h3>");

        schedule.loadSpaces(function() {
            _.each(schedule.spaceMetaList, function(v, k) {
                // prep the Space data for the template
                var templateData = {
                    space: {
                        name: v.name,
                        description: v.description,
                        iconSrc: v.iconSrc,
                        slugify: schedule.slugify
                    }
                };
                schedule.$container.append(schedule.spacesListTemplate(templateData));
            });
        });
    }

    // display all sessions of a particular Space
    schedule.displaySessionsOfSpace = function(space_slug) {
        schedule.getFilteredSessions("space", space_slug);
    }

    // display the list of Pathways and their descriptions
    schedule.displayPathwaysList = function() {
        if (!schedule.sessionList.length) {
            schedule.loadSessions(schedule.appendPathwayListItems);
        } else {
            schedule.appendPathwayListItems();
        }
    }

    schedule.appendPathwayListItems = function() {
        schedule.clearHighlightedPage();
        schedule.$pageLinks.find('#pathways-page-link').addClass('active');
        schedule.$container.html("");
        schedule.addCaptionOverline("<h3><span>Pathways</span></h3>");

        schedule.loadPathways(function() {
            var pathwaysListKeys = _.map(schedule.pathwayMetaList, function(pathway) {
                return pathway.name;
            });

            _.each(_.sortBy(_.keys(schedule.pathwayMap)), function(v, k) {
                // index in pathwaysListKeys 
                var index = pathwaysListKeys.indexOf(v);
                // prep the Pathway data for the template
                var templateData = {
                    name: v,
                    numSessions: schedule.pathwayMap[v],
                    description: [],
                    slugify: schedule.slugify
                };

                if (index > -1) {
                    templateData.description = schedule.pathwayMetaList[index].description;
                }
                schedule.$container.append(schedule.pathwayMapTemplate(templateData));
            });
        });
    }

    schedule.getPathwaysCountMap = function() {
        if ( schedule.pathwayMap.length == 0 ) {
            var pathwaysArray = [];
            _.each(schedule.sessionList, function(session) {
                _.each(session.pathways.split(","), function(p) {
                    pathwaysArray.push(p.trim());
                });
            });
            schedule.pathwayMap = _.countBy(_.flatten(pathwaysArray));
        }
    }


    // add the standard listeners for various user interactions
    schedule.addListeners = function() {
        // clicking on the "Spaces" link on the nav bar displays the list of Spaces
        schedule.$pageLinks.on('click', '#spaces-page-link', function(e) {
            schedule.updateHash('spaces');
            schedule.displaySpacesList();
        });

        // clicking on the "Spaces" link on the nav bar displays the list of Spaces
        schedule.$pageLinks.on('click', '#pathways-page-link', function(e) {
            schedule.updateHash('pathways');
            schedule.displayPathwaysList();
        });

        // clicking on "See all events in this Space" shows all sessions within that particular Space
        schedule.$container.on('click', '.see-all-events-in-this-space', function(e) {
            e.preventDefault();

            var space_slug = $(this).parents(".space-list-item").data("space");
            schedule.updateHash('space-'+space_slug);
            schedule.displaySessionsOfSpace(space_slug);
        });

        // clicking on "Pathway card" shows all sessions that tagged with that pathway
        schedule.$container.on('click', '.pathway-list-item', function(e) {
            e.preventDefault();

            var pathway_slug = $(this).data("pathway");
            schedule.updateHash('pathway-'+pathway_slug);
            schedule.getFilteredSessions("pathways", pathway_slug);
        });

        // clicking on session "card" in a list opens session detail view
        schedule.$container.on('click', '.session-list-item', function(e) {
            e.preventDefault();
            var clicked = $(this).data('session');

            // track interaction in Google Analytics
            schedule.trackEvent('Session Detail Opened', clicked);
            // update the hash for proper routing
            schedule.updateHash('session-'+clicked);
            schedule.getSessionDetail(clicked);
        });

        // return to full schedule from session detail view
        schedule.$container.on('click', '#show-full-schedule', function(e) {
            e.preventDefault();

            if (window.history.ready && !schedule.offlineMode) {
                // use history.back() if possible to keep state in sync
                window.history.back();
            } else {
                // otherwise update hash and clear view manually
                schedule.updateHash('');
                schedule.clearSessionDetail();
                schedule.makeSchedule();
            }
        });

        // scroll down to transcription inside session detail view
        schedule.$container.on('click', '#show-transcription', function(e) {
            e.preventDefault();

            var targetPos = schedule.$container.offset().top + $("#transcription").offset().top;
            $("#session-detail-wrapper").scrollTop(targetPos);
        });

        // toggle session descriptions on "All" sessions tab
        schedule.$container.on('click', '#show-descriptions', function(e) {
            e.preventDefault();
            var clicked = $(this);
            var action = clicked.data('action');

            if (action == 'show') {
                $('.session-list-item').find('.session-description').show();
                clicked.html('<i class="fa fa-minus-circle"></i> Hide descriptions').data('action', 'hide');
            } else {
                $('.session-list-item').find('.session-description').hide();
                clicked.html('<i class="fa fa-plus-circle"></i> Show descriptions').data('action', 'show');
            }
        });

        // toggle individual schedule blocks on header tap
        schedule.$container.on('click', '.slider-control', function(e) {
            var clicked = $(this);
            var targetBlock = clicked.next('.page-block');
            schedule.animateBlockToggle(targetBlock);
            clicked.find('.fa').toggleClass('fa-chevron-circle-left fa-chevron-circle-down')
        });
        
        // toggle all schedule blocks at once
        schedule.$container.on('click', '#slider-collapse-all', function(e) {
            e.preventDefault();
            var clicked = $(this);
            var action = clicked.data('action');
            var targetBlocks = schedule.$container.find('.page-block');

            _.each(targetBlocks, function(b) {
                targetBlock = $(b);
                schedule.animateBlockToggle(targetBlock);
            });
            schedule.$container.find('h3 .fa').toggleClass('fa-chevron-circle-left fa-chevron-circle-down');
            
            if (action == 'collapse') {
                clicked.html('Show all sessions').data('action', 'expand');
            } else {
                clicked.html('Hide all sessions').data('action', 'collapse');
            }
        });

        // helper function for "toggle block" and "toggle all" controls
        schedule.animateBlockToggle = function(targetBlock) {
            targetBlock.toggleClass('closed');
            
            if (targetBlock.hasClass('closed')) {
                targetBlock.css('max-height', 0)
            } else {
                targetBlock.css('max-height', targetBlock.data('max-height'))
            }
        }
        
        // tap stars to favorite/unfavorite via localstorage
        schedule.$container.on('click', '.favorite', function(e) {
            e.preventDefault();
            e.stopPropagation();

            var clicked = $(this);
            var sessionID = clicked.parent().data('session').toString();
            var targets = $('[data-session="' + sessionID + '"]').find('.favorite');

            // first toggle the star class so favorited sessions are lit
            targets.toggleClass('favorite-active');
            if (clicked.hasClass('favorite-active')) {
                // if favorited, add the session ID to savedSessionIDs
                schedule.savedSessionIDs.push(sessionID);
                schedule.trackEvent('Session Faved', sessionID);
            } else {
                // otherwise, we have unfavorited, so remove the saved ID
                schedule.savedSessionIDs = _.without(schedule.savedSessionIDs, sessionID);
                schedule.trackEvent('Session Unfaved', sessionID);
                // if we're actually *on* the "Favorites" tab,
                // we need to remove this element from the page
                if (schedule.chosenTab == 'favorites') {
                    targets.parent('.session-list-item').fadeOut('fast', function() {
                        var target = $(this);
                        var targetBlock = target.parents('.page-block');
                        target.remove();
                        if (!targetBlock.find('.session-list-item').length) {
                            //targetBlock.append('<div class="open-block">OPEN</div>');
                            targetBlock.prev('h3').remove();
                            targetBlock.fadeOut('fast');
                        }
                    });
                }
            }
            // stash the list as a string in localStorage
            localStorage['mozfest2015_saved_sessions'] = schedule.savedSessionIDs.join();
            // update the data associated with this user's favorites
            schedule.updateSavedSessionList();
        });

        // tap a schedule tab to toggle to a different view
        schedule.$toggles.on('click', 'a', function(e) {
            e.preventDefault();

            var clicked = $(this).attr('id');
            schedule.updateHash(clicked);

            schedule.chosenTab = clicked.replace('show-','');
            schedule.trackEvent('Tab change', schedule.chosenTab);
            schedule.loadChosenTab();
        });

        // this is a single-page app, but we need to support the back button
        window.onpopstate = function(event) {
            // if window.history isn't available, bail out
            if (!window.history.ready) return;
            schedule.clearSessionDetail();
            schedule.load();
        };
    }

    // utility function to track events in Google Analytics
    schedule.trackEvent = function(action, label) {
        ga('send', 'event', 'Schedule App', action, label);
    }

    // utility function to pass into templates for nice typography
    schedule.smartypants = function(str) {
        if (!str) { return }
        return str
            // em dashes
            .replace(/--/g, '\u2014')
            // opening single quotes
            .replace(/(^|[-\u2014/(\[{"\s])'/g, '$1\u2018')
            // closing single quotes & apostrophes
            .replace(/'/g, '\u2019')
            // opening double quotes
            .replace(/(^|[-\u2014/(\[{\u2018\s])"/g, '$1\u201c')
            // closing double quotes
            .replace(/"/g, '\u201d')
            // ellipses
            .replace(/\.{3}/g, '\u2026');
    }

    // underscore.string formatters
    schedule.escapeRegExp = function(str) {
        if (str == null) return '';
        return String(str).replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1');
    }
    schedule.defaultToWhiteSpace = function(characters) {
        if (characters == null)
            return '\\s';
        else if (characters.source)
            return characters.source;
        else
            return '[' + escapeRegExp(characters) + ']';
    }
    schedule.nativeTrim = String.prototype.trim;
    schedule.trim = function(str, characters) {
        if (str == null) return '';
        if (!characters && schedule.nativeTrim) return schedule.nativeTrim.call(str);
        characters = schedule.defaultToWhiteSpace(characters);
        return String(str).replace(new RegExp('\^' + characters + '+|' + characters + '+$', 'g'), '');
    }
    schedule.defaultToWhiteSpace = function(characters) {
        if (characters == null)
            return '\\s';
        else if (characters.source)
            return characters.source;
        else
            return '[' + schedule.escapeRegExp(characters) + ']';
    }
    schedule.dasherize = function(str) {
      return schedule.trim(str).replace(/([A-Z])/g, '-$1').replace(/[-_\s]+/g, '-').toLowerCase();
    }

    // utility function to turn strings into "slugs" for easier matching
    // e.g. "My Great Pathway" -> "my-great-pathway"
    schedule.slugify = function(str) {
        if (!str) { return '' }
        var from = "ąàáäâãåæăćęèéëêìíïîłńòóöôõøśșțùúüûñçżź",
            to = "aaaaaaaaaceeeeeiiiilnoooooosstuuuunczz",
            regex = new RegExp(schedule.defaultToWhiteSpace(from), 'g');

        str = String(str).toLowerCase().replace(regex, function(c){
          var index = from.indexOf(c);
          return to.charAt(index) || '-';
        });

        return schedule.dasherize(str.replace(/[^\w\s-]/g, ''));
    }

    // compile the Underscore templates
    schedule.sessionListTemplate = _.template(
        $("script#session-list-template").html()
    );

    schedule.sessionCardTemplate = _.template(
        $("script#session-card-template").html()
    );

    schedule.sessionListItemTemplate = _.template(
        $("script#session-list-item-template").html()
    );

    schedule.sessionDetailTemplate = _.template(
        $("script#session-detail-template").html()
    );

    schedule.spacesListTemplate = _.template(
        $("script#spaces-list-template").html()
    );

    schedule.pathwayMapTemplate = _.template(
        $("script#pathways-list-template").html()
    );

    // fight me
    schedule.init();
}

// settings for marked library, to allow markdown formatting in session details
marked.setOptions({
    tables: false,
    smartypants: true
});

// instantiate the app
new Schedule();