(function(context,$) {

    "use strict";

    context.JK = context.JK || {};
    context.JK.CreateSessionScreen = function(app) {
        var logger = context.JK.logger;
        var realtimeMessaging = context.JK.JamServer;
        var genreSelector;
        var autoComplete = null;
        var usernames = [];
        var userids = [];
        var MAX_GENRES = 3;

        function beforeShow(data) {
            usernames = [];
            userids = [];
            resetForm();
        }

        function resetForm() {
            var $form = $('#create-session-form');
            $('textarea[name="description"]', $form).val('');
            genreSelector.reset();
        }

        function validateForm() {
            var errors = [];
            var $form = $('#create-session-form');

            // Description can't be empty
            var description = $('#description').val();
            if (!description) {
                errors.push(['#description', "Please enter a description."]);
            }

            var genres = genreSelector.getSelectedGenres();

            if (genres.length == 0) {
                errors.push(['#genre-list-items', "Please select a genre."]);
            }

            if (genres.length > MAX_GENRES) {
                errors.push(['#genre-list-items', "No more than " + MAX_GENRES + "genres are allowed."]);
            }

            return (errors.length) ? errors : null;
        }

        function submitForm(evt) {
            evt.preventDefault(); 

            var formErrors = validateForm();
            if (formErrors) {
                app.notify({
                    title: "Validation Errors",
                    text: JSON.stringify(formErrors)
                });
                return false;
            }
            var $this = $(evt.currentTarget);
            logger.debug($this.length);
            var data = {};
            data.client_id = app.clientId;
            data.description = $('#description').val()
            data.as_musician = true;
            data.legal_terms = true; // this overrides the default of 'on', which isn't satisfying our concept of boolean           

            data.genres = genreSelector.getSelectedGenres();

            data.musician_access = $('#musician-access option:selected').val() === "true" ? true : false;
            data.approval_required = $("input[name='musician-access-option']:checked").val() === "true" ? true : false;

            data.fan_access = $('#fan-access option:selected').val() === "true" ? true : false;
            data.fan_chat = $("input[name='fan-chat-option']:checked").val() === "true" ? true : false;

            if ($('#band-list option:selected').val() != '') {
                data.band = $('#band-list option:selected').val();
            }

            // FIXME: Hard-code tracks for now. Needs to default to:
            // 1. If no previous session data, a single stereo track with the
            //    top instrument in the user's profile.
            // 2. Otherwise, use the tracks from the last created session.
            data.tracks = [
                { instrument_id: "electric guitar", sound: "mono" },
                { instrument_id: "keyboard", sound: "mono" }
            ];

            var jsonData = JSON.stringify(data);

            var url = "/api/sessions";
            $.ajax({
                type: "POST",
                dataType: "json",
                contentType: 'application/json',
                url: url,
                processData:false,
                data: JSON.stringify(data),
                success: function(response) {
                    var newSessionId = response.id;
                    createInvitations(newSessionId, function() {
                        context.location = '#/session/' + newSessionId;
                    });
                },
                error: app.ajaxError
            });
            return false;
        }

        function createInvitations(sessionId, onComplete) {
            var callCount = 0;
            $('#added-invitations .invitation').each(function(index, invitation) {
                callCount++;
                var invite_id = $(invitation).attr('user-id');
                var invite = {
                    music_session: sessionId,
                    receiver: invite_id
                };
                $.ajax({
                    type: "POST",
                    url: "/api/invitations",
                    data: invite
                }).done(function(response) {
                    callCount--;
                }).fail(app.ajaxError);
            });
            // TODO - this is the second time I've used this pattern.
            // refactor to make a common utility for this.
            function checker() {
                if (callCount === 0) {
                    onComplete();
                } else {
                    context.setTimeout(checker, 10);
                }
            }
            checker();
        }

        function events() {
            $('#create-session-form').submit(submitForm);
            //$('#added-invitations').on("click", ".invitation span", removeInvitation);
            $('#musician-access').change(toggleMusicianAccess);
            $('#fan-access').change(toggleFanAccess);

            // friend input focus
            $('#friend-input').focus(function() {
                $(this).val('');
            });

            // friend input blur
            // $('#friend-input').blur(function() {
            //     $(this).val('Type a friend\'s name');
            //     $('#friend-search-results').attr('style', 'display:none');
            // });

            // friend input change
            $('#friend-input').keyup(function() {
                //<span onclick="addFriend(this);">
                searchFriends($(this).val());
            });
        }

        function addInvitation() {
            alert(target);
            var template = $('#template-added-invitation').html();
            var inviteHtml = context.JK.fillTemplate(template, {userId: this.id, userName: 'Text'});
            $('#friend-input').prepend(inviteHtml);
        }

        function removeInvitation(evt) {
            $(evt.currentTarget).closest('.invitation').remove();
        }

        function toggleMusicianAccess() {
            var value = $("#musician-access option:selected").val();
            if (value == "false") {
                $("input[name='musician-access-option']").attr('disabled', 'disabled');
                $("input[name='musician-access-option']").parent().addClass("op50");
            }
            else {
                $("input[name='musician-access-option']").removeAttr('disabled');
                $("input[name='musician-access-option']").parent().removeClass("op50");
            }
        }

        function toggleFanAccess() {
            var value = $("#fan-access option:selected").val();
            if (value == "false") {
                $("input[name='fan-chat-option']").attr('disabled', 'disabled');
                $("input[name='fan-chat-option']").parent().addClass("op50");
            }
            else {
                $("input[name='fan-chat-option']").removeAttr('disabled');
                $("input[name='fan-chat-option']").parent().removeClass("op50");
            }
        }

        function loadBands() {
            var url = "/api/users/" + context.JK.currentUserId + "/bands";
            $.ajax({
                type: "GET",
                url: url,
                success: bandsLoaded
            });
        }

        function bandsLoaded(response) {
            $.each(response, function() {
                var template = $('#template-band-option').html();
                var bandOptionHtml = context.JK.fillTemplate(template, {value: this.id, label: this.name});
                $('#band-list').append(bandOptionHtml);
            });
        }

        function searchFriends(query) {
            if (query.length < 2) {
                $('#friend-search-results').empty();
                return;
            }
            var url = "/api/search?query=" + query + "&userId=" + context.JK.currentUserId;
            $.ajax({
                type: "GET",
                url: url,
                success: friendSearchComplete
            });
        }

        function friendSearchComplete(response) {
            // reset search results each time
            $('#friend-search-results').empty();

            // loop through each
            $.each(response.friends, function() {
                // only show friends who are musicians
                if (this.musician === true) {
                    var template = $('#template-friend-search-results').html();
                    var searchResultHtml = context.JK.fillTemplate(template, {userId: this.id, name: this.first_name + ' ' + this.last_name});
                    $('#friend-search-results').append(searchResultHtml);
                    $('#friend-search-results').attr('style', 'display:block');
                }
            });
        }

        function initialize() {
            genreSelector = new context.JK.GenreSelector(app);
            genreSelector.initialize('Choose up to ' + MAX_GENRES + ' genres', MAX_GENRES, $('#create-session-form'));

            events();
            loadBands();
            var screenBindings = { 'beforeShow': beforeShow };
            app.bindScreen('createSession', screenBindings);
        }

        // Expose publics
        this.initialize = initialize;
        this.resetForm = resetForm;
        this.submitForm = submitForm;
        this.validateForm = validateForm;
        this.loadBands = loadBands;
        this.searchFriends = searchFriends;
        this.addInvitation = addInvitation;

        return this;
    };

 })(window,jQuery);