From 3184e7f201af05429bedb4fb8a6300e024946c2a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ale=C5=A1=20Smodi=C5=A1?= <aless@guru.si>
Date: Thu, 24 Sep 2015 14:31:13 +0200
Subject: Implemented: CodeQ event queue, basic translation infrastructure,
 reimplemented problem index from JSON data.

---
 css/codeq.css         |  14 +++++
 index.html            |  31 ++++--------
 js/codeq/comms.js     |   3 +-
 js/codeq/core.js      | 111 +++++++++++++++++++++++++++++++++++++++-
 js/codeq/problem.js   | 138 +++++++++++++++++++++++++++++++++++++++-----------
 js/codeq/statusbar.js |  26 ++++++++++
 6 files changed, 271 insertions(+), 52 deletions(-)
 create mode 100644 js/codeq/statusbar.js

diff --git a/css/codeq.css b/css/codeq.css
index 8604b9c..d293787 100644
--- a/css/codeq.css
+++ b/css/codeq.css
@@ -176,7 +176,21 @@ body {
     -webkit-box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.5);
 }
 
+/* status bar */
+ul.dropdown-menu a {
+    cursor: pointer;
+}
+
+.lang-selection ul.dropdown-menu {
+    min-width: 4em;
+}
+
 /* main screen */
 #screen_language a {
     cursor: pointer;
 }
+
+/* problem index screen */
+#screen_problem .language-problems a {
+    cursor: pointer;
+}
\ No newline at end of file
diff --git a/index.html b/index.html
index 31e383b..1dfe0e0 100644
--- a/index.html
+++ b/index.html
@@ -41,6 +41,12 @@
                 <div class="collapse navbar-collapse">
                     <ul class="nav navbar-nav navbar-right">
                         <p class="navbar-text" id="signed-in-title">Signed in as Franc Jožef</p>
+                        <li class="dropdown lang-selection">
+                            <a href="#" class="dropdown-toggle" data-toggle="dropdown" aria-expanded="true">
+                                <span class="lang-choice"></span>
+                            </a>
+                            <ul class="dropdown-menu"></ul>
+                        </li>
                         <li class="dropdown">
                             <a href="#" class="dropdown-toggle" data-toggle="dropdown" aria-expanded="true">
                                 <span class="glyphicon glyphicon glyphicon-user"></span>
@@ -91,27 +97,11 @@
         </div>
 
         <!-- problem selection screen for a specific language: groups of problems, with descriptions -->
-        <div id="screen_problem" style="text-align: center; display: none;">
-            <h1>CodeQ Select Problem</h1>
+        <div id="screen_problem" style="display: none;">
+            <h1 class="language-title"></h1>
             <hr>
-            <table style="margin: 0 auto;">
-                <tbody>
-                <tr>
-                    <td style="text-align: right;">Problem:</td>
-                    <td>
-                        <select name="problem_group" id="problem_group" style="min-width: 10em;">
-                        </select>
-                        <select name="problem" id="problems" style="min-width: 10em;">
-                        </select>
-                    </td>
-                </tr>
-                <tr>
-                    <td colspan="2" style="text-align: center;">
-                        <button type="button" id="submit_problem">Select</button>
-                    </td>
-                </tr>
-                </tbody>
-            </table>
+            <div class="language-description"></div>
+            <ul class="language-problems"></ul>
         </div>
 
         <!-- problem screen: prolog -->
@@ -198,6 +188,7 @@
         <script src="js/codemirror/show-hint.js"></script>
         <!-- codeq app -->
         <script src="js/codeq/core.js"></script>
+        <script src="js/codeq/statusbar.js"></script>
         <script src="js/codeq/navigation.js"></script>
         <script src="js/codeq/comms.js"></script>
         <script src="js/codeq/console.js"></script>
diff --git a/js/codeq/comms.js b/js/codeq/comms.js
index f9e49ae..2d934bd 100644
--- a/js/codeq/comms.js
+++ b/js/codeq/comms.js
@@ -169,7 +169,7 @@
         ajaxGet = function (url) {
             return Q.Promise(function (resolve, reject, notify) {
                 $.ajax({
-                    dataType: 'application/json',
+                    dataType: 'json',
                     type: 'GET',
                     url: url,
                     error: function (jqXHR, textStatus, errorThrown) {
@@ -206,6 +206,7 @@
         ajaxPrefix[ajaxPrefix.length - 1] = '';
         ajaxPrefix = ajaxPrefix.join('/');
     }
+    ajaxPrefix = ajaxPrefix + 'data/';
 
     // ================================================================================
     // This module's API methods
diff --git a/js/codeq/core.js b/js/codeq/core.js
index 61ef607..148cdeb 100644
--- a/js/codeq/core.js
+++ b/js/codeq/core.js
@@ -147,7 +147,10 @@
         regexpWhiteSpaceBeforeTag = new RegExp('[ \r\n\t]+(?=<)', 'g'),
         regexpWhiteSpaceAfterTag = new RegExp('>[ \r\n\t]+', 'g'),
         regexpWhiteSpace = new RegExp('[ \\r\\n\\t]+'),
-        regexpWhiteSpaceTrim = new RegExp('^[ \\t\\r\\n]*(.*[^ \\t\\r\\n])[ \\t\\r\\n]*$', 'm');
+        regexpWhiteSpaceTrim = new RegExp('^[ \\t\\r\\n]*(.*[^ \\t\\r\\n])[ \\t\\r\\n]*$', 'm'),
+        regexpAmp = new RegExp('&', 'g'),
+        regexpLt = new RegExp('<', 'g'),
+        regexpGt = new RegExp('>', 'g');
 
     // convert a string into its definition (javascript literal)
     var stringToDef = function (str) {
@@ -160,11 +163,76 @@
         return html.replace(regexpWhiteSpaceBeforeTag, '').split(regexpWhiteSpaceAfterTag).join('>');
     };
 
+    var lang = 'en'; // this is overridden in the boot sequence below, if the browser uses a supported language
+
+    var eventListeners = {}, // keyed by event name, value is an array of listeners
+        asyncTimer = null,
+        queuedEvents = [],
+        fireEvents = function () {
+            if (asyncTimer !== null) return;
+            asyncTimer = setTimeout(function () {
+                var N = queuedEvents.length,
+                    i, event, args, listeners, j;
+                asyncTimer = null;
+                for (i = 0; i < N; i++) {
+                    event = queuedEvents[i];
+                    listeners = eventListeners[event.name];
+                    if (!listeners) continue;
+                    args = event.args;
+                    listeners = listeners.slice(); // make a copy of the list, so we're unaffected of any changes
+                    for (j = 0; j < listeners.length; j++) {
+                        try {
+                            listeners[j](args);
+                        }
+                        catch (e) {
+                            codeq.log.error('Error while invoking an event handler for ' + event.name + ': ' + e, e);
+                        }
+                    }
+                }
+                queuedEvents.splice(0, N);
+                if (queuedEvents.length > 0) fireEvents();
+            }, 0);
+        };
+
     window.codeq = {
         'jsonize': jsonize,
 
         'log': log,
 
+        'supportedLangs': {
+            'en': 'English',
+            'sl': 'Slovenščina'
+        },
+        'getLang': function () {
+            return lang;
+        },
+
+        'setLang': function (newLang) {
+            lang = newLang;
+            codeq.fire('langchange', {'lang': newLang});
+        },
+
+        'chooseTranslation': function (translations, language) {
+            var tr, lang;
+            if ((typeof translations !== 'object') || (translations === null)) return {};
+            tr = translations[language || codeq.lang];
+            if ((typeof tr === 'object') && (tr !== null)) return tr;
+            // default fallback
+            tr = translations['en'];
+            if ((typeof tr === 'object') && (tr !== null)) return tr;
+            // fallback to whatever is available
+            for (lang in translations) {
+                tr = translations[lang];
+                if ((typeof tr === 'object') && (tr !== null)) return tr;
+            }
+            // all options were exhausted, we have nothing
+            return {};
+        },
+
+        'escapeHtml': function (s) {
+            return ('' + s).replace(regexpAmp, '&amp;').replace(regexpLt, '&lt;').replace(regexpGt, '&gt;');
+        },
+
         /**
          * Returns the number of Unicode code points in the given string.
          *
@@ -262,6 +330,38 @@
                 if ((typeof args !== 'object') || (args === null)) args = {};
                 return f.apply(args);
             };
+        },
+
+        // codeq event handling
+
+        'fire': function (eventName, args) {
+            queuedEvents.push({'name': eventName, 'args': args});
+            fireEvents();
+        },
+
+        'on': function (eventName, callback) {
+            var listeners = eventListeners[eventName],
+                i;
+            if (listeners) {
+                for (i = listeners.length - 1; i >= 0; i--) {
+                    if (listeners[i] === callback) return; // already registered
+                }
+            }
+            else {
+                listeners = [];
+                eventListeners[eventName] = listeners;
+            }
+            listeners.push(callback);
+        },
+
+        'off': function (eventName, callback) {
+            var listeners = eventListeners[eventName],
+                i;
+            if (listeners) {
+                for (i = listeners.length - 1; i >= 0; i--) {
+                    if (listeners[i] === callback) listeners.splice(i, 1);
+                }
+            }
         }
     };
 
@@ -270,6 +370,15 @@
     // ================================================================================
 
     $(document).ready(function () {
+        // set the language
+        var lang = navigator.language || navigator.browserLanguage;
+        if (typeof lang === 'string') {
+            lang = lang.split('-')[0]; // truncate the language variant, in eg. en-US
+            if (lang in codeq.supportedLangs) codeq.lang = lang;
+        }
+        codeq.setLang(lang); // initial language setting
+
+        // go to login
         codeq.globalStateMachine.transition('login');
     });
 })();
diff --git a/js/codeq/problem.js b/js/codeq/problem.js
index f19cbd4..fcb5d8a 100644
--- a/js/codeq/problem.js
+++ b/js/codeq/problem.js
@@ -1,33 +1,112 @@
-/**
- * Created by robert on 9/18/15.
- */
-
-/**
- * Created by robert on 9/18/15.
- */
-
 (function(){
-    var lastLanguage;
+    var jqScreen = $('#screen_problem'),
+        jqLanguageTitle = jqScreen.find('.language-title'),
+        jqLanguageDescription = jqScreen.find('.language-description'),
+        jqLanguageProblems = jqScreen.find('.language-problems'),
+        languageCache = {}, // keyed by language identifier
+        currentData = null, // currently active data
+        createLanguageData = function (data, languageIdentifier, lang) { // data is the content of language.json
+            var trLanguage = codeq.chooseTranslation(data.translations, lang),
+                groups = data.groups || {},
+                languageHints = trLanguage.hint || {},
+                html = [],
+                problemReferences = [],
+                groupIdentifier, group, trGroup, problems, problemIdentifier, problem, trProblem;
+            for (groupIdentifier in groups) {
+                if (!groups.hasOwnProperty(groupIdentifier)) continue;
+                group = groups[groupIdentifier] || {};
+                trGroup = codeq.chooseTranslation(group.translations, lang);
+                html.push('<li><div class="group-title">', codeq.escapeHtml(trGroup.name || 'Group name not set: ' + groupIdentifier), '</div>');
+                html.push('<div class="group-description">', codeq.escapeHtml(trGroup.description || 'Group description not set: ' + groupIdentifier), '</div>');
+                html.push('<ul class="group-problems">');
+                problems = group.problems || {};
+                for (problemIdentifier in problems) {
+                    if (!problems.hasOwnProperty(problemIdentifier)) continue;
+                    problem = problems[problemIdentifier];
+                    trProblem = codeq.chooseTranslation(problem.translations, lang);
+                    html.push('<li><a class="problem-', '' + problemReferences.length, '">', codeq.escapeHtml(trProblem.name || 'Problem name not set: ' + problemIdentifier), '</a></li>');
+                    problemReferences.push({'g': groupIdentifier, 'p': problemIdentifier});
+                }
+                html.push('</ul></li>');
+            }
+            return {
+                'name': trLanguage.name || 'Language name not set: ' + languageIdentifier,
+                'description': trLanguage.description || 'Description not set: ' + languageIdentifier,
+                'html': html.join(''),
+                'refs': problemReferences,
+                'hints': trLanguage.hint || {}
+            };
+        },
+        onLangChange = function (args) {
+            purgeDom();
+            createDom(currentData);
+        },
+        createDom = function (languageData) {
+            var lang = codeq.getLang(),
+                language = languageData.identifier,
+                data = languageData[lang];
+            if (!data) {
+                data = createLanguageData(languageData.raw, language, lang);
+                languageData[lang] = data;
+            }
+            jqLanguageTitle.html(data.name);
+            jqLanguageDescription.html(data.description);
+            jqLanguageProblems.html(data.html);
+            jqLanguageProblems.find('a').on('click', function () {
+                var index = +$(this).attr('class').split('-')[1],
+                    ref = data.refs[index];
+                if (!ref) {
+                    codeq.log.error('Clicked on a problem link having erroneous index: ' + index);
+                    return;
+                }
+                // transition
+                codeq.wait(
+                    codeq.comms.getProblem(language, ref.g, ref.p)
+                        .then(function (data) {
+                            if (data.code !== 0) throw new Error('Failed to obtain problem data, code: ' + data.code + ', message: ' + data.message);
+                            codeq.globalStateMachine.transition(language, data);
+                        })
+                    )
+                    .fail(function (reason) {
+                        codeq.log.error('Failed to obtain the problem definition: ' + reason, reason);
+                        alert('Failed to obtain the problem definition: ' + reason);
+                    })
+                    .done();
+            });
+            codeq.on('langchange', onLangChange);
+        },
+        purgeDom = function () {
+            jqLanguageProblems.find('a').off();
+            jqLanguageProblems.empty();
+            jqLanguageDescription.empty();
+            jqLanguageTitle.empty();
+            codeq.off('langchange', onLangChange);
+        },
+        lastLanguage;
+
     codeq.globalStateMachine.register('problem',{
         'enter': function(language){
-            if(language)lastLanguage = language;
-            else language = lastLanguage;//This happens when we hit this with the back button
-
-            $('#disabled').css('display', '');
-            $('#disabled').css('cursor', 'wait');
+            if (language) lastLanguage = language;
+            else language = lastLanguage; // This happens when we hit this with the back button
 
             $('#navigation-login').css('display', '');
-            /*$('#navigation-login').on('click', function(){
-                codeq.globalStateMachine.transition('login');
-            });*/
             $('#navigation-language').css('display', '');
-            /*$('#navigation-language').on('click', function(){
-                codeq.globalStateMachine.transition('language');
-            });*/
-            $("#navigation-problem").addClass("active");
-            $('#navigation-problem').css('display', '');
+            $("#navigation-problem").addClass("active").css('display', '');
+            jqScreen.css('display', '');
+
+            currentData = languageCache[language];
+            if (currentData) {
+                createDom(currentData);
+            }
+            else {
+                codeq.wait(codeq.comms.getLanguageDef(language).then(function (rawData) {
+                    currentData = {'raw': rawData, 'identifier': language};
+                    languageCache[language] = currentData;
+                    createDom(currentData);
+                })).done();
+            }
 
-            codeq.comms.send({'action': 'list_problems', 'language':language})
+/*            codeq.comms.send({'action': 'list_problems', 'language':language})
                 .then(
                 function success(data) {
                     var i, groups, group, problems, problem, first_group,
@@ -107,21 +186,20 @@
                     $('#disabled').css('cursor', '');
                     alert('Request to obtain list of problems failed: ' + reason);
                 }
-            ).done();
+            ).done();*/
         },
         'exit' : function(){
-            $('#problem_group').off();
+            purgeDom();
+/*            $('#problem_group').off();
             $("#submit_problem").off();
             $("#problem_group option").remove();//empty the selects
             $("#problems option").remove();
-            $("#screen_problem").css('display', 'none');
+            $("#screen_problem").css('display', 'none');*/
 
+            jqScreen.css('display', 'none');
             $('#navigation-login').css('display', 'none');
-            //$('#navigation-login').off();
             $('#navigation-language').css('display', 'none');
-            //$('#navigation-language').off();
-            $('#navigation-problem').css('display', 'none');
-            $("#navigation-problem").removeClass("active");
+            $('#navigation-problem').css('display', 'none').removeClass("active");
         }
     });
 })();
\ No newline at end of file
diff --git a/js/codeq/statusbar.js b/js/codeq/statusbar.js
new file mode 100644
index 0000000..2134b93
--- /dev/null
+++ b/js/codeq/statusbar.js
@@ -0,0 +1,26 @@
+(function () {
+
+    var jqBar = $('#topbar'),
+        jqLang = jqBar.find('.lang-selection'),
+        jqLangChoice = jqLang.find('.lang-choice');
+
+    (function () {
+        var langs = codeq.supportedLangs,
+            jqMenu = jqBar.find('.dropdown-menu'),
+            lang, cssClass;
+        for (lang in langs) {
+            if (!langs.hasOwnProperty(lang)) continue;
+            cssClass = 'lang-' + lang;
+            jqMenu.append('<li><a class="' + cssClass + '">' + lang + '</a></li>');
+            jqMenu.find('.' + cssClass).on('click', (function (l) {return function () {codeq.setLang(l)};})(lang));
+        }
+    })();
+
+    codeq.on('langchange', function (params) {
+        jqLangChoice.text(params.lang);
+    });
+
+    codeq.statusbar = {
+
+    };
+})();
\ No newline at end of file
-- 
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