Add base for handling and storing progress

assets/javascript/progress.js

@@ -0,0 +1,59 @@
+define([
+    "lodash",
+    "jQuery",
+    "utils/storage"
+], function(_, $, storage) {
+    // Get current level
+    var getCurrentLevel = function() {
+        return $(".book").data("level");
+    };
+
+    // Return all levels
+    var getLevels = function() {
+        var levels = $(".book-summary li[data-level]");
+        return _.map(levels, function(level) {
+            return $(level).data("level");
+        });
+    };
+
+    // Return a map chapter -> number (timestamp)
+    var getProgress = function() {
+        // Current level
+        var progress = storage.get("progress", {});
+
+        // Levels
+        var levels = getLevels();
+
+        _.each(levels, function(level) {
+            progress[level] = progress[level] || 0;
+        });
+
+        return progress;
+    };
+
+    // Change value of progress for a level
+    var markProgress = function(level, state) {
+        if (state == null) state = true;
+
+        var progress = getProgress();
+        progress[level] = state? Date.now() : 0;
+    };
+
+    // Show progress
+    var showProgress = function() {
+        var progress = getProgress();
+        var $summary = $(".book-summary");
+
+        _.each(progress, function(value, level) {
+            $summary.find("li[data-level='"+level+"']").toggleClass("done", value > 0);
+        });
+    };
+
+    return {
+        'current': getCurrentLevel,
+        'levels': getLevels,
+        'get': getProgress,
+        'mark': markProgress,
+        'show': showProgress
+    };
+});