116 lines
3.3 KiB
JavaScript
116 lines
3.3 KiB
JavaScript
define([
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], function () {
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var Todo = {};
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/* data model
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{
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"order": [
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"123456789abcdef0",
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"23456789abcdef01",
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"0123456789abcedf"
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],
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"data": {
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"0123456789abcedf": {
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"state": 0, // used to sort completed elements
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"task": "pewpewpew",
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"ctime": +new Date(), // used to display chronologically
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"mtime": +new Date(), // used to display recent actions
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// "deadline": +new Date() + 1000 * 60 * 60 * 24 * 7
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},
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"123456789abcdef0": {},
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"23456789abcdef01": {}
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}
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}
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*/
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var val = function (proxy, id, k, v) {
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var el = proxy.data[id];
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if (!el) {
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throw new Error('expected an element');
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}
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if (typeof(v) === 'function') { el[k] = v(el[k]); }
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else { el[k] = v; }
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return el[k];
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};
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var initialize = function (proxy) {
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// run migration
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if (typeof(proxy.data) !== 'object') { proxy.data = {}; }
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if (!Array.isArray(proxy.order)) { proxy.order = []; }
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if (typeof(proxy.type) !== 'string') { proxy.type = 'todo'; }
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// if a key exists in order, but there is no data for it...
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// remove that key
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var i = proxy.order.length - 1;
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for (;i >= 0; i--) {
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if (typeof(proxy.data[proxy.order[i]]) === 'undefined') {
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console.log('removing todo entry with no data at [%s]', i);
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proxy.order.splice(i, 1);
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}
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}
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// if you have data, but it's not in the order array...
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// add it to the order array...
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Object.keys(proxy.data).forEach(function (key) {
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if (proxy.order.indexOf(key) > -1) { return; }
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console.log("restoring entry with missing key");
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proxy.order.unshift(key);
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});
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};
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/* add (id, obj) push id to order, add object to data */
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var add = function (proxy, id, obj) {
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if (!Array.isArray(proxy.order)) {
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throw new Error('expected an array');
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}
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proxy.order.unshift(id);
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proxy.data[id] = obj;
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};
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/* delete (id) remove id from order, delete id from data */
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var remove = function (proxy, id) {
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if (Array.isArray(proxy.order)) {
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var i = proxy.order.indexOf(id);
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proxy.order.splice(i, 1);
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}
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if (proxy.data[id]) { delete proxy.data[id]; }
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};
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/* change the order in the proxy (with a check to make sure that nothing is missing */
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var reorder = function (proxy, order) {
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var existingOrder = proxy.order.slice().sort();
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var newOrder = order.slice().sort();
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if (JSON.stringify(existingOrder) === JSON.stringify(newOrder)) {
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proxy.order = order.slice();
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} else {
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console.error("Can't reorder the tasks. Some tasks are missing or added");
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}
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};
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Todo.init = function (proxy) {
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var api = {};
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initialize(proxy);
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api.val = function (id, k, v) {
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return val(proxy, id, k, v);
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};
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api.add = function (id, obj) {
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return add(proxy, id, obj);
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};
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api.remove = function (id) {
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return remove(proxy, id);
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};
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api.getOrder = function () {
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return proxy.order.slice();
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};
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api.reorder = function (order) {
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return reorder(proxy, order);
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};
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return api;
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};
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return Todo;
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});
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