var $body;
var $modal;
var $modalCover;
var $newComponentItem;
var $changedInput;
var $spinner;

$(document).ready(function () {
    $body = $('body');
    $modal = $('.history-modal');
    $modalCover = $('<div class="modal-cover">');
    // cdodge: this looks funny, but on AWS instances, this base.js get's wrapped in a separate scope as part of Django static
    // pipelining (note, this doesn't happen on local runtimes). So if we set it on window, when we can access it from other
    // scopes (namely the course-info tab)
    window.$modalCover = $modalCover;

    $body.append($modalCover);
    $newComponentItem = $('.new-component-item');
    $newComponentTypePicker = $('.new-component');
    $newComponentTemplatePickers = $('.new-component-templates');
    $newComponentButton = $('.new-component-button');
    $spinner = $('<span class="spinner-in-field-icon"></span>');
    $body.bind('keyup', onKeyUp);

    $('.expand-collapse-icon').bind('click', toggleSubmodules);
    $('.visibility-options').bind('change', setVisibility);

    $modal.bind('click', hideModal);
    $modalCover.bind('click', hideModal);
    $('.uploads .upload-button').bind('click', showUploadModal);
    $('.upload-modal .close-button').bind('click', hideModal);

    $body.on('click', '.embeddable-xml-input', function () {
        $(this).select();
    });

    $('.unit .item-actions .delete-button').bind('click', deleteUnit);
    $('.new-unit-item').bind('click', createNewUnit);

    $('body').addClass('js');

    // lean/simple modal
    $('a[rel*=modal]').leanModal({overlay : 0.80, closeButton: '.action-modal-close' });
    $('a.action-modal-close').click(function(e){
        (e).preventDefault();
    });

    // nav - dropdown related
    $body.click(function (e) {
        $('.nav-dropdown .nav-item .wrapper-nav-sub').removeClass('is-shown');
        $('.nav-dropdown .nav-item .title').removeClass('is-selected');
    });

    $('.nav-dropdown .nav-item .title').click(function (e) {

        $subnav = $(this).parent().find('.wrapper-nav-sub');
        $title = $(this).parent().find('.title');
        e.preventDefault();
        e.stopPropagation();

        if ($subnav.hasClass('is-shown')) {
            $subnav.removeClass('is-shown');
            $title.removeClass('is-selected');
        }

        else {
            $('.nav-dropdown .nav-item .title').removeClass('is-selected');
            $('.nav-dropdown .nav-item .wrapper-nav-sub').removeClass('is-shown');
            $title.addClass('is-selected');
            $subnav.addClass('is-shown');
        }
    });

    // general link management - new window/tab
    $('a[rel="external"]').attr('title', 'This link will open in a new browser window/tab').bind('click', linkNewWindow);

    // general link management - lean modal window
    $('a[rel="modal"]').attr('title', 'This link will open in a modal window').leanModal({overlay: 0.50, closeButton: '.action-modal-close' });
    $('.action-modal-close').click(function (e) {
        (e).preventDefault();
    });

    // general link management - smooth scrolling page links
    $('a[rel*="view"][href^="#"]').bind('click', smoothScrollLink);


    // toggling overview section details
    $(function () {
        if ($('.courseware-section').length > 0) {
            $('.toggle-button-sections').addClass('is-shown');
        }
    });
    $('.toggle-button-sections').bind('click', toggleSections);

    // autosave when leaving input field
    $body.on('change', '.subsection-display-name-input', saveSubsection);
    $('.subsection-display-name-input').each(function () {
        this.val = $(this).val();
    });
    $("#start_date, #start_time, #due_date, #due_time").bind('change', autosaveInput);
    $('.sync-date, .remove-date').bind('click', autosaveInput);

    // expand/collapse methods for optional date setters
    $('.set-date').bind('click', showDateSetter);
    $('.remove-date').bind('click', removeDateSetter);
    // add new/delete section
    $('.new-courseware-section-button').bind('click', addNewSection);
    $('.delete-section-button').bind('click', deleteSection);

    // add new/delete subsection
    $('.new-subsection-item').bind('click', addNewSubsection);
    $('.delete-subsection-button').bind('click', deleteSubsection);

    $('.sync-date').bind('click', syncReleaseDate);

    // import form setup
    $('.import .file-input').bind('change', showImportSubmit);
    $('.import .choose-file-button, .import .choose-file-button-inline').bind('click', function (e) {
        e.preventDefault();
        $('.import .file-input').click();
    });

    $('.new-course-button').bind('click', addNewCourse);

    // section name editing
    $('.section-name').bind('click', editSectionName);
    $('.edit-section-name-cancel').bind('click', cancelEditSectionName);
    // $('.edit-section-name-save').bind('click', saveEditSectionName);

    // section date setting
    $('.set-publish-date').bind('click', setSectionScheduleDate);
    $('.edit-section-start-cancel').bind('click', cancelSetSectionScheduleDate);
    $('.edit-section-start-save').bind('click', saveSetSectionScheduleDate);

    $('.upload-modal .choose-file-button').bind('click', showFileSelectionMenu);

    $body.on('click', '.section-published-date .edit-button', editSectionPublishDate);
    $body.on('click', '.section-published-date .schedule-button', editSectionPublishDate);
    $body.on('click', '.edit-subsection-publish-settings .save-button', saveSetSectionScheduleDate);
    $body.on('click', '.edit-subsection-publish-settings .cancel-button', hideModal);
    $body.on('change', '.edit-subsection-publish-settings .start-date', function () {
        if ($('.edit-subsection-publish-settings').find('.start-time').val() == '') {
            $('.edit-subsection-publish-settings').find('.start-time').val('12:00am');
        }
    });
    $('.edit-subsection-publish-settings').on('change', '.start-date, .start-time', function () {
        $('.edit-subsection-publish-settings').find('.save-button').show();
    });
});

function smoothScrollLink(e) {
    (e).preventDefault();

    $.smoothScroll({ 
        offset: -200, 
        easing: 'swing', 
        speed: 1000,
        scrollElement: null,
        scrollTarget: $(this).attr('href')
    });
}

function linkNewWindow(e) {
    window.open($(e.target).attr('href'));
    e.preventDefault();
}

// On AWS instances, base.js gets wrapped in a separate scope as part of Django static
// pipelining (note, this doesn't happen on local runtimes). So if we set it on window,
// when we can access it from other scopes (namely the checklists)
window.cmsLinkNewWindow = linkNewWindow;

function toggleSections(e) {
    e.preventDefault();

    $section = $('.courseware-section');
    sectionCount = $section.length;
    $button = $(this);
    $labelCollapsed = $('<i class="ss-icon ss-symbolicons-block">up</i> <span class="label">Collapse All Sections</span>');
    $labelExpanded = $('<i class="ss-icon ss-symbolicons-block">down</i> <span class="label">Expand All Sections</span>');

    var buttonLabel = $button.hasClass('is-activated') ? $labelCollapsed : $labelExpanded;
    $button.toggleClass('is-activated').html(buttonLabel);

    if ($button.hasClass('is-activated')) {
        $section.addClass('collapsed');
        // first child in order to avoid the icons on the subsection lists which are not in the first child
        $section.find('header .expand-collapse-icon').removeClass('collapse').addClass('expand');
    } else {
        $section.removeClass('collapsed');
        // first child in order to avoid the icons on the subsection lists which are not in the first child
        $section.find('header .expand-collapse-icon').removeClass('expand').addClass('collapse');
    }
}

function editSectionPublishDate(e) {
    e.preventDefault();
    $modal = $('.edit-subsection-publish-settings').show();
    $modal = $('.edit-subsection-publish-settings').show();
    $modal.attr('data-id', $(this).attr('data-id'));
    $modal.find('.start-date').val($(this).attr('data-date'));
    $modal.find('.start-time').val($(this).attr('data-time'));
    if ($modal.find('.start-date').val() == '' && $modal.find('.start-time').val() == '') {
        $modal.find('.save-button').hide();
    }
    $modal.find('.section-name').html('"' + $(this).closest('.courseware-section').find('.section-name-span').text() + '"');
    $modalCover.show();
}

function showImportSubmit(e) {
    var filepath = $(this).val();
    if (filepath.substr(filepath.length - 6, 6) == 'tar.gz') {
        $('.error-block').hide();
        $('.file-name').html($(this).val().replace('C:\\fakepath\\', ''));
        $('.file-name-block').show();
        $('.import .choose-file-button').hide();
        $('.submit-button').show();
        $('.progress').show();
    } else {
        $('.error-block').html('File format not supported. Please upload a file with a <code>tar.gz</code> extension.').show();
    }
}

function syncReleaseDate(e) {
    e.preventDefault();
    $(this).closest('.notice').hide();
    $("#start_date").val("");
    $("#start_time").val("");
}

function getEdxTimeFromDateTimeVals(date_val, time_val, format) {
    var edxTimeStr = null;

    if (date_val != '') {
        if (time_val == '')
            time_val = '00:00';

        // Note, we are using date.js utility which has better parsing abilities than the built in JS date parsing
        var date = Date.parse(date_val + " " + time_val);
        if (format == null)
            format = 'yyyy-MM-ddTHH:mm';

        edxTimeStr = date.toString(format);
    }

    return edxTimeStr;
}

function getEdxTimeFromDateTimeInputs(date_id, time_id, format) {
    var input_date = $('#' + date_id).val();
    var input_time = $('#' + time_id).val();

    return getEdxTimeFromDateTimeVals(input_date, input_time, format);
}

function autosaveInput(e) {
    var self = this;
    if (this.saveTimer) {
        clearTimeout(this.saveTimer);
    }

    this.saveTimer = setTimeout(function () {
        $changedInput = $(e.target);
        saveSubsection();
        self.saveTimer = null;
    }, 500);
}

function saveSubsection() {
    // Spinner is no longer used by subsection name, but is still used by date and time pickers on the right.
    if ($changedInput && !$changedInput.hasClass('no-spinner')) {
        $spinner.css({
            'position': 'absolute',
            'top': Math.floor($changedInput.position().top + ($changedInput.outerHeight() / 2) + 3),
            'left': $changedInput.position().left + $changedInput.outerWidth() - 24,
            'margin-top': '-10px'
        });
        $changedInput.after($spinner);
        $spinner.show();
    }

    var id = $('.subsection-body').data('id');

    // pull all 'normalized' metadata editable fields on page
    var metadata_fields = $('input[data-metadata-name]');

    var metadata = {};
    for (var i = 0; i < metadata_fields.length; i++) {
        var el = metadata_fields[i];
        metadata[$(el).data("metadata-name")] = el.value;
    }

    // Piece back together the date/time UI elements into one date/time string
    // NOTE: our various "date/time" metadata elements don't always utilize the same formatting string
    // so make sure we're passing back the correct format
    metadata['start'] = getEdxTimeFromDateTimeInputs('start_date', 'start_time');
    metadata['due'] = getEdxTimeFromDateTimeInputs('due_date', 'due_time', 'MMMM dd HH:mm');

    $.ajax({
        url: "/save_item",
        type: "POST",
        dataType: "json",
        contentType: "application/json",
        data: JSON.stringify({ 'id': id, 'metadata': metadata}),
        success: function () {
            $spinner.delay(500).fadeOut(150);
            $changedInput = null;
        },
        error: function () {
            showToastMessage('There has been an error while saving your changes.');
        }
    });
}


function createNewUnit(e) {
    e.preventDefault();

    parent = $(this).data('parent');
    template = $(this).data('template');

    $.post('/clone_item',
        {'parent_location': parent,
            'template': template,
            'display_name': 'New Unit'
        },
        function (data) {
            // redirect to the edit page
            window.location = "/edit/" + data['id'];
        });
}

function deleteUnit(e) {
    e.preventDefault();
    _deleteItem($(this).parents('li.leaf'));
}

function deleteSubsection(e) {
    e.preventDefault();
    _deleteItem($(this).parents('li.branch'));
}

function deleteSection(e) {
    e.preventDefault();
    _deleteItem($(this).parents('section.branch'));
}

function _deleteItem($el) {
    if (!confirm('Are you sure you wish to delete this item. It cannot be reversed!'))
        return;

    var id = $el.data('id');

    $.post('/delete_item',
        {'id': id, 'delete_children': true, 'delete_all_versions': true},
        function (data) {
            $el.remove();
        });
}

function showUploadModal(e) {
    e.preventDefault();
    $modal = $('.upload-modal').show();
    $('.file-input').bind('change', startUpload);
    $modalCover.show();
}

function showFileSelectionMenu(e) {
    e.preventDefault();
    $('.file-input').click();
}

function startUpload(e) {
    $('.upload-modal h1').html('Uploading…');
    $('.upload-modal .file-name').html($('.file-input').val().replace('C:\\fakepath\\', ''));
    $('.upload-modal .file-chooser').ajaxSubmit({
        beforeSend: resetUploadBar,
        uploadProgress: showUploadFeedback,
        complete: displayFinishedUpload
    });
    $('.upload-modal .choose-file-button').hide();
    $('.upload-modal .progress-bar').removeClass('loaded').show();
}

function resetUploadBar() {
    var percentVal = '0%';
    $('.upload-modal .progress-fill').width(percentVal);
    $('.upload-modal .progress-fill').html(percentVal);
}

function showUploadFeedback(event, position, total, percentComplete) {
    var percentVal = percentComplete + '%';
    $('.upload-modal .progress-fill').width(percentVal);
    $('.upload-modal .progress-fill').html(percentVal);
}

function displayFinishedUpload(xhr) {
    if (xhr.status = 200) {
        markAsLoaded();
    }

    var resp = JSON.parse(xhr.responseText);
    $('.upload-modal .embeddable-xml-input').val(xhr.getResponseHeader('asset_url'));
    $('.upload-modal .embeddable').show();
    $('.upload-modal .file-name').hide();
    $('.upload-modal .progress-fill').html(resp.msg);
    $('.upload-modal .choose-file-button').html('Load Another File').show();
    $('.upload-modal .progress-fill').width('100%');

    // see if this id already exists, if so, then user must have updated an existing piece of content
    $("tr[data-id='" + resp.url + "']").remove();

    var template = $('#new-asset-element').html();
    var html = Mustache.to_html(template, resp);
    $('table > tbody').prepend(html);

}

function markAsLoaded() {
    $('.upload-modal .copy-button').css('display', 'inline-block');
    $('.upload-modal .progress-bar').addClass('loaded');
}

function hideModal(e) {
    if (e) {
        e.preventDefault();
    }
    // Unit editors do not want the modal cover to hide when users click outside
    // of the editor. Users must press Cancel or Save to exit the editor.
    // module_edit adds and removes the "is-fixed" class.
    if (!$modalCover.hasClass("is-fixed")) {
        $('.file-input').unbind('change', startUpload);
        $modal.hide();
        $modalCover.hide();
    }
}

function onKeyUp(e) {
    if (e.which == 87) {
        $body.toggleClass('show-wip hide-wip');
    }
}

function toggleSubmodules(e) {
    e.preventDefault();
    $(this).toggleClass('expand').toggleClass('collapse');
    $(this).closest('.branch, .window').toggleClass('collapsed');
}

function setVisibility(e) {
    $(this).find('.checked').removeClass('checked');
    $(e.target).closest('.option').addClass('checked');
}

function editComponent(e) {
    e.preventDefault();
    $(this).closest('.xmodule_edit').addClass('editing').find('.component-editor').slideDown(150);
}

function closeComponentEditor(e) {
    e.preventDefault();
    $(this).closest('.xmodule_edit').removeClass('editing').find('.component-editor').slideUp(150);
}

function showDateSetter(e) {
    e.preventDefault();
    var $block = $(this).closest('.due-date-input');
    $(this).hide();
    $block.find('.date-setter').show();
}

function removeDateSetter(e) {
    e.preventDefault();
    var $block = $(this).closest('.due-date-input');
    $block.find('.date-setter').hide();
    $block.find('.set-date').show();
    // clear out the values
    $block.find('.date').val('');
    $block.find('.time').val('');
}

function showToastMessage(message, $button, lifespan) {
    var $toast = $('<div class="toast-notification"></div>');
    var $closeBtn = $('<a href="#" class="close-button">×</a>');
    $toast.append($closeBtn);
    var $content = $('<div class="notification-content"></div>');
    $content.html(message);
    $toast.append($content);
    if ($button) {
        $button.addClass('action-button');
        $button.bind('click', hideToastMessage);
        $content.append($button);
    }
    $closeBtn.bind('click', hideToastMessage);

    if ($('.toast-notification')[0]) {
        var targetY = $('.toast-notification').offset().top + $('.toast-notification').outerHeight();
        $toast.css('top', (targetY + 10) + 'px');
    }

    $body.prepend($toast);
    $toast.fadeIn(200);

    if (lifespan) {
        $toast.timer = setTimeout(function () {
            $toast.fadeOut(300);
        }, lifespan * 1000);
    }
}

function hideToastMessage(e) {
    e.preventDefault();
    $(this).closest('.toast-notification').remove();
}

function addNewSection(e, isTemplate) {
    e.preventDefault();

    $(e.target).addClass('disabled');

    var $newSection = $($('#new-section-template').html());
    var $cancelButton = $newSection.find('.new-section-name-cancel');
    $('.courseware-overview').prepend($newSection);
    $newSection.find('.new-section-name').focus().select();
    $newSection.find('.section-name-form').bind('submit', saveNewSection);
    $cancelButton.bind('click', cancelNewSection);
    $body.bind('keyup', { $cancelButton: $cancelButton }, checkForCancel);
}

function checkForCancel(e) {
    if (e.which == 27) {
        $body.unbind('keyup', checkForCancel);
        e.data.$cancelButton.click();
    }
}


function saveNewSection(e) {
    e.preventDefault();

    var $saveButton = $(this).find('.new-section-name-save');
    var parent = $saveButton.data('parent');
    var template = $saveButton.data('template');
    var display_name = $(this).find('.new-section-name').val();

    $.post('/clone_item', {
            'parent_location': parent,
            'template': template,
            'display_name': display_name,
        },
        function (data) {
            if (data.id != undefined)
                location.reload();
        }
    );
}

function cancelNewSection(e) {
    e.preventDefault();
    $('.new-courseware-section-button').removeClass('disabled');
    $(this).parents('section.new-section').remove();
}

function addNewCourse(e) {
    e.preventDefault();

    $(e.target).hide();
    var $newCourse = $($('#new-course-template').html());
    var $cancelButton = $newCourse.find('.new-course-cancel');
    $('.inner-wrapper').prepend($newCourse);
    $newCourse.find('.new-course-name').focus().select();
    $newCourse.find('form').bind('submit', saveNewCourse);
    $cancelButton.bind('click', cancelNewCourse);
    $body.bind('keyup', { $cancelButton: $cancelButton }, checkForCancel);
}

function saveNewCourse(e) {
    e.preventDefault();

    var $newCourse = $(this).closest('.new-course');
    var template = $(this).find('.new-course-save').data('template');
    var org = $newCourse.find('.new-course-org').val();
    var number = $newCourse.find('.new-course-number').val();
    var display_name = $newCourse.find('.new-course-name').val();

    if (org == '' || number == '' || display_name == '') {
        alert('You must specify all fields in order to create a new course.');
        return;
    }

    $.post('/create_new_course', {
            'template': template,
            'org': org,
            'number': number,
            'display_name': display_name
        },
        function (data) {
            if (data.id != undefined) {
                window.location = '/' + data.id.replace(/.*:\/\//, '');
            } else if (data.ErrMsg != undefined) {
                alert(data.ErrMsg);
            }
        });
}

function cancelNewCourse(e) {
    e.preventDefault();
    $('.new-course-button').show();
    $(this).parents('section.new-course').remove();
}

function addNewSubsection(e) {
    e.preventDefault();
    var $section = $(this).closest('.courseware-section');
    var $newSubsection = $($('#new-subsection-template').html());
    $section.find('.subsection-list > ol').append($newSubsection);
    $section.find('.new-subsection-name-input').focus().select();

    var $saveButton = $newSubsection.find('.new-subsection-name-save');
    var $cancelButton = $newSubsection.find('.new-subsection-name-cancel');

    var parent = $(this).parents("section.branch").data("id");

    $saveButton.data('parent', parent);
    $saveButton.data('template', $(this).data('template'));

    $newSubsection.find('.new-subsection-form').bind('submit', saveNewSubsection);
    $cancelButton.bind('click', cancelNewSubsection);
    $body.bind('keyup', { $cancelButton: $cancelButton }, checkForCancel);
}

function saveNewSubsection(e) {
    e.preventDefault();

    var parent = $(this).find('.new-subsection-name-save').data('parent');
    var template = $(this).find('.new-subsection-name-save').data('template');

    var display_name = $(this).find('.new-subsection-name-input').val();

    $.post('/clone_item', {
            'parent_location': parent,
            'template': template,
            'display_name': display_name
        },
        function (data) {
            if (data.id != undefined) {
                location.reload();
            }
        }
    );
}

function cancelNewSubsection(e) {
    e.preventDefault();
    $(this).parents('li.branch').remove();
}

function editSectionName(e) {
    e.preventDefault();
    $(this).unbind('click', editSectionName);
    $(this).children('.section-name-edit').show();
    $(this).find('.edit-section-name').focus();
    $(this).children('.section-name-span').hide();
    $(this).find('.section-name-edit').bind('submit', saveEditSectionName);
    $(this).find('.edit-section-name-cancel').bind('click', cancelNewSection);
    $body.bind('keyup', { $cancelButton: $(this).find('.edit-section-name-cancel') }, checkForCancel);
}

function cancelEditSectionName(e) {
    e.preventDefault();
    $(this).parent().hide();
    $(this).parent().siblings('.section-name-span').show();
    $(this).closest('.section-name').bind('click', editSectionName);
    e.stopPropagation();
}

function saveEditSectionName(e) {
    e.preventDefault();

    $(this).closest('.section-name').unbind('click', editSectionName);

    var id = $(this).closest('.courseware-section').data('id');
    var display_name = $.trim($(this).find('.edit-section-name').val());

    $(this).closest('.courseware-section .section-name').append($spinner);
    $spinner.show();

    if (display_name == '') {
        alert("You must specify a name before saving.");
        return;
    }

    var $_this = $(this);
    // call into server to commit the new order
    $.ajax({
        url: "/save_item",
        type: "POST",
        dataType: "json",
        contentType: "application/json",
        data: JSON.stringify({ 'id': id, 'metadata': {'display_name': display_name}})
    }).success(function () {
            $spinner.delay(250).fadeOut(250);
            $_this.closest('h3').find('.section-name-span').html(display_name).show();
            $_this.hide();
            $_this.closest('.section-name').bind('click', editSectionName);
            e.stopPropagation();
        });
}

function setSectionScheduleDate(e) {
    e.preventDefault();
    $(this).closest("h4").hide();
    $(this).parent().siblings(".datepair").show();
}

function cancelSetSectionScheduleDate(e) {
    e.preventDefault();
    $(this).closest(".datepair").hide();
    $(this).parent().siblings("h4").show();
}

function saveSetSectionScheduleDate(e) {
    e.preventDefault();

    var input_date = $('.edit-subsection-publish-settings .start-date').val();
    var input_time = $('.edit-subsection-publish-settings .start-time').val();

    var start = getEdxTimeFromDateTimeVals(input_date, input_time);

    var id = $modal.attr('data-id');

    // call into server to commit the new order
    $.ajax({
        url: "/save_item",
        type: "POST",
        dataType: "json",
        contentType: "application/json",
        data: JSON.stringify({ 'id': id, 'metadata': {'start': start}})
    }).success(function () {
            var $thisSection = $('.courseware-section[data-id="' + id + '"]');
            $thisSection.find('.section-published-date').html('<span class="published-status"><strong>Will Release:</strong> ' + input_date + ' at ' + input_time + '</span><a href="#" class="edit-button" data-date="' + input_date + '" data-time="' + input_time + '" data-id="' + id + '">Edit</a>');
            $thisSection.find('.section-published-date').animate({
                'background-color': 'rgb(182,37,104)'
            }, 300).animate({
                    'background-color': '#edf1f5'
                }, 300).animate({
                    'background-color': 'rgb(182,37,104)'
                }, 300).animate({
                    'background-color': '#edf1f5'
                }, 300);

            hideModal();
        });
}