initialize data model and provide basic methods

www/todo/todo.js

@@ -0,0 +1,70 @@
+define([
+
+], function () {
+    var Todo = {};
+    var Cryptpad;
+
+/*  data model
+{
+  "order": [
+    "123456789abcdef0",
+    "23456789abcdef01",
+    "0123456789abcedf"
+  ],
+  "data": {
+    "0123456789abcedf": {
+      "state": 0, // used to sort completed elements
+      "task": "pewpewpew",
+      "ctime": +new Date(), // used to display chronologically
+      "mtime": +new Date(), // used to display recent actions
+      // "deadline": +new Date() + 1000 * 60 * 60 * 24 * 7
+    },
+    "123456789abcdef0": {},
+    "23456789abcdef01": {}
+  }
+}
+*/
+
+    var initialize = function (proxy) {
+        // run migration
+        if (typeof(proxy.data) !== 'object') { proxy.data = {}; }
+        if (Array.isArray(proxy.order)) { proxy.order = []; }
+        if (typeof(proxy.type) !== 'string') { proxy.type = 'todo'; }
+    };
+
+    /*  add (id, obj) push id to order, add object to data */
+    var add = function (proxy, id, obj) {
+        if (!Array.isArray(proxy.order)) {
+            throw new Error('expected an array');
+        }
+        proxy.order.push(id);
+        proxy.data[id] = obj;
+    };
+
+    /*  delete (id) remove id from order, delete id from data */
+    var remove = function (proxy, id) {
+        if (Array.isArray(proxy.order)) {
+            var i = proxy.order.indexOf(id);
+            proxy.order.splice(i, 1);
+        }
+        if (proxy.data[id]) { delete proxy.data[id]; }
+    };
+
+    Todo.init = function (proxy, common) {
+        Cryptpad = common;
+
+        var api = {};
+        initialize(proxy);
+
+        api.add = function (id, obj) {
+            return add(proxy, id, obj);
+        };
+        api.remove = function (id) {
+            return remove(proxy, id);
+        };
+
+        return api;
+    };
+
+    return Todo;
+});