christabor / flask_jsondash

/**

 * Bootstrapping functions, event handling, etc... for application.

 */

var jsondash = function() {

    var my = {

        chart_wall: null,

        widgets: {}

    };

    var dashboard_data    = null;

    var $API_ROUTE_URL    = '[name="dataSource"]';

    var $API_PREVIEW      = '#api-output';

    var $API_PREVIEW_BTN  = '#api-output-preview';

    var $MODULE_FORM      = '#module-form';

    var $ADD_MODULE       = '#add-module';

    var $MAIN_CONTAINER   = '#container';

    var $EDIT_MODAL       = '#chart-options';

    var $DELETE_BTN       = '#delete-widget';

    var $DELETE_DASHBOARD = '.delete-dashboard';

    var $SAVE_MODULE      = '#save-module';

    var $EDIT_CONTAINER   = '#edit-view-container';

    var $MAIN_FORM        = '#save-view-form';

    var $JSON_DATA        = '#raw-config';

    function addWidget(container, config) {

        return d3.select(container).select('div')

            .append('div')

            .classed({item: true, widget: true})

            .attr('data-guid', config.guid)

            .attr('data-refresh', config.refresh)

            .attr('data-refresh-interval', config.refreshInterval)

            .style('width', config.width + 'px')

            .style('height', config.height + 'px')

            .html(d3.select('#chart-template').html())

            .select('.widget-title .widget-title-text').text(config.name);

    }

    function previewAPIRoute(e) {

        e.preventDefault();

        // Shows the response of the API field as a json payload, inline.

        $.ajax({

            type: 'get',

            url: $($API_ROUTE_URL).val().trim(),

            success: function(d) {

               $($API_PREVIEW).html(prettyCode(d));

            },

            error: function(d, status, error) {

                $($API_PREVIEW).html(error);

            }

        });

    }

    function refreshableType(type) {

        if(type === 'youtube') {return false;}

        return true;

    }

        var config   = jsondash.util.serializeToJSON($($MODULE_FORM).serializeArray());

        var newfield = $('<input class="form-control" type="text">');

        var id       = jsondash.util.guid();

        // Add a unique guid for referencing later.

        config['guid'] = id;

        // Add family for lookups

        config['family'] = $($MODULE_FORM).find('[name="type"]').find('option:selected').data().family;

        if(!config.refresh || !refreshableType(config.type)) {config['refresh'] = false;}

        if(!config.override) {config['override'] = false;}

        newfield.attr('name', 'module_' + id);

        newfield.val(JSON.stringify(config));

        $('.modules').append(newfield);

        // Save immediately.

        $($MAIN_FORM).submit();

    }

    function isModalButton(e) {

        return e.relatedTarget.id === $ADD_MODULE.replace('#', '');

    }

    function updateEditForm(e) {

        var module_form = $($MODULE_FORM);

        // If the modal caller was the add modal button, skip populating the field.

        $($API_PREVIEW).text('...');

        if(isModalButton(e)) {

            module_form.find('input').each(function(_, input){

                $(input).val('');

            });

            $($DELETE_BTN).hide();

            return;

        }

        $($DELETE_BTN).show();

        // Updates the fields in the edit form to the active widgets values.

        var item = $(e.relatedTarget).closest('.item.widget');

        var guid = item.data().guid;

        var module = getModule(item);

        // Update the modal window fields with this one's value.

        $.each(module, function(field, val){

            if(field === 'override' || field === 'refresh') {

                module_form.find('[name="' + field + '"]').prop('checked', val);

            } else {

                module_form.find('[name="' + field + '"]').val(val);

            }

        });

        // Update with current guid for referencing the module.

        module_form.attr('data-guid', guid);

        populateOrderField(module);

    }

    function populateOrderField(module) {

        var module_form = $($MODULE_FORM);

        var widgets = $('.item.widget');

        // Add the number of items to order field.

        var order_field = module_form.find('[name="order"]');

        var max_options = widgets.length > 0 ? widgets.length + 1 : 2;

        order_field.find('option').remove();

        // Add empty option.

        order_field.append('<option value=""></option>');

        d3.map(d3.range(1, max_options), function(i){

            var option = $('<option></option>');

            option.val(i).text(i);

            order_field.append(option);

        });

        order_field.val(module && module.order ? module.order : '');

    }

        var module_form = $($MODULE_FORM);

        // Updates the module input fields with new data by rewriting them all.

        var guid = module_form.attr('data-guid');

        var active = getModuleByGUID(guid);

        // Update the modules values to the current input values.

        module_form.find('input').each(function(_, input){

            var name = $(input).attr('name');

            if(name) {

                if(name === 'override' || name === 'refresh') {

                    // Convert checkbox to json friendly format.

                    active[name] = $(input).is(':checked');

                } else {

                    active[name] = $(input).val();

                }

            }

        });

        // Update bar chart type

        active['type'] = module_form.find('[name="type"]').val();

        // Update order

        active['order'] = parseInt(module_form.find('[name="order"]').val(), 10);

        // Clear out module input values

        $('.modules').empty();

        $.each(dashboard_data.modules, function(i, module){

            var val = JSON.stringify(module, module);

            var input = $('<input type="text" name="module_' + i + '" class="form-control">');

            input.val(val);

            $('.modules').append(input);

        });

        updateWidget(active);

        $($EDIT_CONTAINER).collapse();

        // Refit the grid

        fitGrid();

    }

    function updateWidget(config) {

        // Trigger update form into view since data is dirty

        // Update visual size to existing widget.

        var widget = my.widgets[config.guid].el;

        loader(widget);

        widget.style({

            height: config.height + 'px',

            width: config.width + 'px'

        });

        widget.select('.widget-title .widget-title-text').text(config.name);

        loadWidgetData(widget, config);

    }

    function refreshWidget(e) {

        e.preventDefault();

        var config = getModule($(this).closest('.widget'));

        var widget = addWidget($MAIN_CONTAINER, config);

        loadWidgetData(widget, config);

        fitGrid();

    }

    function addChartContainers(container, data) {

            // Closure to maintain each chart data value in loop

            (function(config){

                // Add div wrappers for js grid layout library,

                // and add title, icons, and buttons

                var widget = addWidget(container, config);

                my.widgets[config.guid] = {el: widget, config: config};

            })(data.modules[name]);

        }

        fitGrid();

            var widg = my.widgets[guid];

            loadWidgetData(widg.el, widg.config);

        }

    }

    function getModuleByGUID(guid) {

        return my.widgets[guid].config;

    }

    function deleteModule(e) {

        e.preventDefault();

        if(!confirm('Are you sure?')) {return;}

        var guid = $($MODULE_FORM).attr('data-guid');

        // Remove form input and visual widget

        $('.modules').find('#' + guid).remove();

        $('.item.widget[data-guid="' + guid + '"]').remove();

        $($EDIT_MODAL).modal('hide');

        // Redraw wall to replace visual 'hole'

        fitGrid();

        // Trigger update form into view since data is dirty

        $($EDIT_CONTAINER).collapse('show');

    }

    function addDomEvents() {

        // TODO: debounce/throttle

        $($API_ROUTE_URL).on('change.charts', previewAPIRoute);

        $($API_PREVIEW_BTN).on('click.charts', previewAPIRoute);

        // Save module popup form

        $($SAVE_MODULE).on('click.charts.module', saveModule);

        // Edit existing modules

        $($EDIT_MODAL).on('show.bs.modal', updateEditForm);

        $('#update-module').on('click.charts.module', updateModule);

        // Allow swapping of edit/update events

        // for the add module button and form modal

        $($ADD_MODULE).on('click.charts', function(){

            $('#update-module')

            .attr('id', $SAVE_MODULE.replace('#', ''))

            .text('Save module')

            .off('click.charts.module')

            .on('click.charts', saveModule);

        });

        // Allow swapping of edit/update events

        // for the edit button and form modal

        $('.widget-edit').on('click.charts', function(){

            $($SAVE_MODULE)

            .attr('id', 'update-module')

            .text('Update module')

            .off('click.charts.module')

            .on('click.charts', updateModule);

        });

        // Add delete button for existing widgets.

        $($DELETE_BTN).on('click.charts', deleteModule);

        // Add delete confirm for dashboards.

        $($DELETE_DASHBOARD).on('submit.charts', function(e){

        });

    }

        fitGrid({

            columnWidth: 5,

            itemSelector: '.item',

            transitionDuration: 0,

            fitWidth: true

        }, true);

        $('.item.widget').removeClass('hidden');

    }

    function fitGrid(opts, init) {

        var options = $.extend({}, opts, {});

        if(init) {

            my.chart_wall = $('#container').packery(options);

                scroll: true,

                handle: '.dragger',

                stop: function(){

                    $($EDIT_CONTAINER).collapse('show');

                    updateModuleOrder();

                    my.chart_wall.packery(options);

                }

            });

            my.chart_wall.packery('bindUIDraggableEvents', items);

        } else {

            my.chart_wall.packery(options);

        }

    }

    function updateModuleOrder() {

        var items = my.chart_wall.packery('getItemElements');

        // Update module order

            var module = getModule($(this));

            var config = $.extend(module, {order: i});

            updateModuleInput(config);

        });

    }

    function getModule(el) {

        // Return module by element

        var data = el.data();

        var guid = data.guid;

        return getModuleByGUID(guid);

    }

    function loader(container) {

        container.select('.loader-overlay').classed({hidden: false});

        container.select('.widget-loader').classed({hidden: false});

    }

    function unload(container) {

        container.select('.loader-overlay').classed({hidden: true});

        container.select('.widget-loader').classed({hidden: true});

    }

    function handleInputs(widget, config) {

        var inputs_selector = '[data-guid="' + config.guid + '"] .chart-inputs';

        // Load event handlers for these newly created forms.

        $(inputs_selector).find('form').on('submit', function(e){

            e.stopImmediatePropagation();

            e.preventDefault();

            // Just create a new url for this, but use existing config.

            // The global object config will not be altered.

            // The first {} here is important, as it enforces a deep copy,

            // not a mutation of the original object.

            var url = config.dataSource;

            // Ensure we don't lose params already save on this endpoint url.

            var existing_params = url.split('?')[1];

            var params = getValidParamString($(this).serializeArray());

            var _config = $.extend({}, config, {

                dataSource: url.replace(/\?.+/, '') + '?' + existing_params + '&' + params

            });

            // Otherwise reload like normal.

            loadWidgetData(widget, _config);

            // Hide the form again

            $(inputs_selector).removeClass('in');

        });

    }

    function getValidParamString(arr) {

        // Jquery $.serialize and $.serializeArray will

        // return empty query parameters, which is undesirable and can

        // be error prone for RESTFUL endpoints.

        // e.g. `foo=bar&bar=` becomes `foo=bar`

        var param_str = '';

        $.each(arr, function(i, param){

            param_str += (param.name + '=' + param.value);

        });

        return param_str;

    }

    function addResizeEvent(widget, config) {

        // Add resize event

        $(widget[0]).resizable({

            helper: 'resizable-helper',

            minWidth: 200,

            minHeight: 200,

            stop: function(event, ui) {

                // Update the configs dimensions.

                config = $.extend(config, {width: ui.size.width, height: ui.size.height});

                updateModuleInput(config);

                loadWidgetData(widget, config);

                fitGrid();

                // Open save panel

                $($EDIT_CONTAINER).collapse('show');

            }

        });

    }

    function updateModuleInput(config) {

        $('input[id="' + config.guid + '"]').val(JSON.stringify(config));

    }

    function prettyCode(code) {

        return JSON.stringify(JSON.parse(code), null, 4);

    }

    function addRefreshers(modules) {

        $.each(modules, function(_, module){

            if(module.refresh && module.refreshInterval) {

                var container = d3.select('[data-guid="' + module.guid + '"]');

                setInterval(function(){

                    loadWidgetData(container, module);

                }, parseInt(module.refreshInterval, 10));

            }

        });

    }

    function loadDashboard(data) {

        // Load the grid before rendering the ajax, since the DOM

        // is rendered server side.

        initGrid($MAIN_CONTAINER);

        // Add actual ajax data.

        addChartContainers($MAIN_CONTAINER, data);

        dashboard_data = data;

        // Add event handlers for widget UI

        $('.widget-refresh').on('click.charts', refreshWidget);

        // Setup refresh intervals for all widgets that specify it.

        addRefreshers(data.modules);

        // Format json config display

            var code = $(this).find('code').text();

            $(this).find('code').text(prettyCode(code));

        });

        // Add event for downloading json config raw.

        // Will provide decent support but still not major: http://caniuse.com/#search=download

            var datestr = new Date().toString().replace(/ /gi, '-');

            var json_data = $($JSON_DATA).val();

            var data = encodeURIComponent(JSON.stringify(json_data, null, 4));

            data = "data:text/json;charset=utf-8," + data;

            $(this).attr('href', data);

            $(this).attr('download', 'charts-config-raw-' + datestr + '.json');

        });

        // Reformat the code inside of the raw json field, to pretty print

        // for the user.

        $($JSON_DATA).text(prettyCode($($JSON_DATA).text()));

        // Setup responsive handlers

        var jres = jRespond([

        {

            label: 'handheld',

            enter: 0,

            exit: 767

        }

        ]);

        jres.addFunc({

            breakpoint: 'handheld',

            enter: function() {

                $('.widget').css({

                    'max-width': '100%',

                    'width': '100%',

                    'position': 'static'

                });

            }

        });

        populateOrderField();

        fitGrid();

    }

    my.config = {

        WIDGET_MARGIN_X: 20,

        WIDGET_MARGIN_Y: 60

    };

    my.loadDashboard = loadDashboard;

    my.handlers = {};

    my.util = {};

    my.loader = loader;

    my.unload = unload;

    my.addDomEvents = addDomEvents;

    return my;

}();