From 13753d58d6aceaea8f246040518d50f2eb06a8d9 Mon Sep 17 00:00:00 2001
From: Geo Halkiadakis <gchalkiadakis@sklavenitis.co.gr>
Date: Mon, 24 Apr 2023 18:02:13 +0300
Subject: several hot-fixes; working on lessons flash-management

---
 public/assets/js/admin/lessons.js | 386 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 386 insertions(+)
 create mode 100644 public/assets/js/admin/lessons.js

(limited to 'public/assets/js/admin/lessons.js')

diff --git a/public/assets/js/admin/lessons.js b/public/assets/js/admin/lessons.js
new file mode 100644
index 0000000..8391f4d
--- /dev/null
+++ b/public/assets/js/admin/lessons.js
@@ -0,0 +1,386 @@
+// Globals
+// -----------------------------------------------------------------------------
+var categories = [];
+var privileges = [];
+var lessons = [];
+var table;
+
+
+
+// Supplamentary functions
+// -----------------------------------------------------------------------------
+
+// array.indexOf polyfill
+// --- -- -- - - -
+if (!Array.prototype.indexOf)
+{
+  Array.prototype.indexOf = function(elt /*, from*/)
+  {
+    var len = this.length >>> 0;
+
+    var from = Number(arguments[1]) || 0;
+    from = (from < 0)
+         ? Math.ceil(from)
+         : Math.floor(from);
+    if (from < 0)
+      from += len;
+
+    for (; from < len; from++)
+    {
+      if (from in this &&
+          this[from] === elt)
+        return from;
+    }
+    return -1;
+  };
+}
+
+
+// Supplamentary functions
+// -----------------------------------------------------------------------------
+
+// function for sorting an array by 'label' attribute
+// --- -- -- - - -
+function compare_label (a,b) {
+    if ( a.label < b.label ) { return -1; }
+    if ( a.label > b.label ) { return 1; }
+    return 0;
+}
+
+
+// function for sorting an array by 'breadcrumb' attribute
+// --- -- -- - - -
+function compare_breadcrumb (a,b) {
+    if ( a.breadcrumb < b.breadcrumb ) { return -1; }
+    if ( a.breadcrumb > b.breadcrumb ) { return 1; }
+    return 0;
+}
+
+// return category record by category-id
+// --- -- -- - - -
+function lesson_record(id) {
+    var record = 0;
+    lessons.forEach(el => { if (el.id == id) record = el; });
+   
+    return record;
+}
+
+
+// return children of parent
+// --- -- -- - - -
+function childs_of_parents(list) {
+    // if 'list' is integer then make it an one-item list
+    parents = (Number.isInteger(list)) ? [ list ] : list;
+
+    var childs = [];
+
+    if (parents.length == 0) { return []; }
+
+    parents.forEach( pid => {
+        categories.forEach( el => { if (el.parent == pid) childs.push(el.id)});
+    });
+
+    var grandchilds = childs_of_parents(childs);
+
+    return childs.concat(grandchilds);
+}
+
+
+// create actions html (edit and delete buttons)
+// --- -- -- - - -
+function create_actions_html(el) {
+
+    var pub, del, edit;
+
+    // preapre [show|hide]-file as reference
+    if (el.status == 1) {
+        pub = '<span class="btn btn-sm"><i class="fas fa-eye"></i></span>';
+
+    } else {
+        pub = '<span class="btn btn-sm"><i class="fas fa-eye-slash"></i></span>';
+    }
+
+    del = "";
+
+    fast_edit = [
+        '<button type="button" class="btn btn-sm btn-light"',
+            'data-bs-toggle="modal" data-bs-target="#manageLessons"',
+            'data-id="'+ el.id +'">',
+            '<i class="fa-solid fa-bolt"></i>',
+        '</button>'
+    ].join('\n');
+
+    edit = [
+        '<a type="button" class="btn btn-sm btn-warning "',
+            'href="/admin/edit_lesson/'+ el.id +'">',
+            '<i class="fas fa-pencil-alt"></i>',
+        '</a>'
+    ].join('\n');
+
+    return pub +' '+ fast_edit +' '+ edit +' '+ del;
+}
+
+
+
+$(document).ready(function() {
+
+    // When document is ready
+    // -------------------------------------------------------------------------
+
+
+    // inti category (select2)
+    // ...
+    $("#privilege_id").select2({
+        placeholder: 'Επίπεδο Πρόσβασης',
+        width: '100%'
+    });
+    
+    /** init selec2 element (used to specify parent-category)
+     * --- -- -- - - -
+     */
+    $("#course_id").select2({
+        placeholder: 'Κεφάλαιο',
+        dropdownParent: $('#manageLessons'),
+        width: '100%',
+    });
+
+    
+    /** init_table
+     * --- -- -- - - -
+     * get categories
+     * constuct categories array
+     * render dataTable 
+     */
+    function init_table() {
+
+        // get all categories from server (ajax)
+        $.getJSON( "/admin/api/lessons")
+        .done(function( json ) {
+            // then ...
+
+            // reset categories
+            lessons.length = 0;
+
+            // construct (new) categories data
+            Object.keys(json).forEach( key => {
+                el = json[key];
+                lessons.push({
+                    id: parseInt(el.id),
+                    title: el.title,
+                    course_id: el.course_id,
+                    privilege_id: el.privilege_id,
+                    actions: create_actions_html(el)
+                });
+            });
+
+            // sort by breadcrumb
+            // categories.sort( compare_breadcrumb );
+
+            // destroy previous datatable table instances
+            $('#dt-lessons').dataTable().fnClearTable();
+            $('#dt-lessons').dataTable().fnDestroy();
+
+            // (re-)create categories datatable
+            table = $('#dt-lessons').DataTable({
+                language: { url: '/libs/DataTables/localization/Greek.json' },           
+                data: lessons,
+                ordering: false,
+                columns: [
+                    { data: 'id' },
+                    { data: 'title' },
+                    { data: 'course_id' },
+                    { data: 'privilege_id' },
+                    { data: 'actions' }
+                ]
+            });
+
+        })
+        .fail(function( jqxhr, textStatus, error ) {
+            console.log( "Request Failed (" + error +")" );
+        });
+
+    }
+
+
+    $.when(     // when loaded posts and categories
+
+        $.getJSON( "/admin/api/categories" ),
+
+        $.getJSON( "/admin/api/privileges" )
+
+    ).done( function( categories_response, privileges_response ) {
+
+        // construct categories data
+        // ---
+        Object.keys(categories_response[0]).forEach( key => {
+            cat = categories_response[0][key];
+            categories.push({
+                id: cat.rec.id,
+                label: cat.breadcrumb.replaceAll('\t', ' / ')
+            });
+        });
+        categories.sort( compare_label );  // sort categories by breadcrumb
+
+        // construct provileges data
+        // ---
+        Object.keys(privileges_response[0]).forEach( key => {
+            priv = privileges_response[0][key];
+            privileges.push({
+                id: priv.id,
+                label: priv.label
+            });
+        });
+        privileges.sort( compare_label );  // sort categories by breadcrumb
+
+        set_parent_options( $('#course_id'), categories );
+        set_parent_options( $('#privilege_id'), privileges );
+
+        init_table();   // init table on first run
+    });
+
+
+    /** set_parent_options()
+     * 
+     * -> create options for parents <select>
+     * -> choose selected parent
+     * 
+     * NOTE:
+     * the targer <select> should be a select2 control
+     * 
+     * @param parents (array): array of parents
+     * @param selected (int): selected parent
+     */
+    function set_parent_options(selector, list, selected_value = false) {
+
+        list.forEach( li => {   // attach options into <select> control
+            selector.append(`<option value="${li.id}">${li.label}</option>`);
+        });
+
+        if (selected_value !== false) {     // mark selected option(s)
+            selector.val(selected_value).trigger('change');
+        }
+        else { selector.val(null).trigger('change'); }
+    }
+
+
+
+    /** When modal show-up
+     * -------------------------------------------------------------------------
+     * ... prepare the manage-category form 
+     * ... update select2 with possible parents
+     */
+    $('#manageCategory').on('show.bs.modal', event => {
+        var button = $(event.relatedTarget);        // Button that triggered the modal
+        var id = parseInt( button.data('id') );     // category_id from data-id
+        // var modal = $(this);    // modal object     
+        
+        // update modal literature
+        // ---
+        $('#manageCategory .modal-title').html(             // modal title
+            (id) ? 'Ενημέρωση Κατηγορίας' : 'Δημιουργία Κατηγορίας'
+        );
+        $('#manageCategory form input[name=id]').val( id );     // category id (hidden)
+        $('#manageCategory form input[name=label]').val(    // category label
+            (id) ? category_record(id).label : ""
+        );
+        prepare_parents_element(id);        // prepare <select> for parents
+    })
+
+//    /** prepare_parents_element()
+//     * ---
+//     * @param id (int) : id of selected category
+//     * -> Get all posible parents
+//     * -> call set_parent_options() to render the options
+//     */
+//    function prepare_parents_element(id) {
+//        var parents = [];
+//
+//        if (id) {   // get all possible parents
+//
+//            // id-category and subcategories are fobiden parents
+//            var forbiden = childs_of_parents(id);
+//            forbiden.push(id);
+//
+//            // filter catogories adn prepare parents
+//            categories.forEach( el => {
+//                if (!forbiden.includes(el.id))  {
+//                    parents.push({
+//                        id: el.id,
+//                        breadcrumb: el.breadcrumb,
+//                    });
+//                }
+//            });
+//            set_parent_options(parents, category_record(id).parent);
+//
+//
+//        } else {    // new record; all categories are possible parrents
+//            categories.forEach( el => {
+//                parents.push({
+//                    id: el.id,
+//                    breadcrumb: el.breadcrumb,
+//                });
+//            })
+//            set_parent_options(parents, -1);
+//        }
+//    }
+
+    /** set_parent_options()
+     * -> create options for parents <select>
+     * -> choose selected parent
+     * @param parents (array): array of parents
+     * @param selected (int): selected parent
+     */
+    function set_select_options(parents, selected) {
+        // sort parents by breadcrumb
+        parents.sort( compare_breadcrumb );
+
+        // remove any olded options from select2
+        $('#parent_id option').each(function() { $(this).remove(); });
+
+        // first option is the root category
+        $('#parent_id').append('<option value="0">Root</option>')
+
+        // add all other parent options
+        parents.forEach( i => {
+            $('#parent_id').append(`<option value="${i.id}">${i.breadcrumb}</option>`);
+        });
+
+        if (selected == -1) {   // new category; remove any parent pre-selection
+            $('#parent_id').val(null).trigger('change');
+
+        } else {    // category exists; choose selected parent
+            $('#parent_id').val(selected).trigger('change');
+        }
+    }
+
+
+
+
+    // When form is submited
+    // -------------------------------------------------------------------------
+
+    $('#manageCategory form').submit( event => {
+        event.preventDefault();
+
+        // prepare data to POST
+        var data = {
+            id: parseInt($('#manageCategory form input[name=id]').val()),
+            label: $('#manageCategory form input[name=label]').val(),
+            parent_id: parseInt($('#parent_id').select2('data')[0].id)
+        };
+
+        // select action url (add or update)
+        var request = '/admin/api/categories/' + ((data.id == 0)  ? 'add' : 'update');
+
+        // send POST request
+        $.post(request, data)
+        .done(function( data ) {
+
+            $('#manageCategory').modal('hide');     // when done, close modal
+
+            init_table();       // reload table of categories
+        });       
+
+    });
+
+});
-- 
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