feat: rediseño UI completo + infra email + stats

api/services/stats.js

@@ -0,0 +1,55 @@
+'use strict';
+
+const fs   = require('fs');
+const path = require('path');
+
+const DATA_FILE = path.join(__dirname, '..', 'data', 'stats.json');
+
+const EMPTY = () => ({
+  total_sent:       0,
+  total_redirected: 0,
+  total_errors:     0,
+  total_searches:   0,
+  by_provider:      Object.create(null), // null prototype — previene prototype pollution
+  updated:          null,
+});
+
+function load() {
+  try {
+    return JSON.parse(fs.readFileSync(DATA_FILE, 'utf8'));
+  } catch {
+    return EMPTY();
+  }
+}
+
+function save(data) {
+  const dir = path.dirname(DATA_FILE);
+  fs.mkdirSync(dir, { recursive: true });
+  const tmp = DATA_FILE + '.tmp';
+  fs.writeFileSync(tmp, JSON.stringify(data, null, 2), 'utf8');
+  fs.renameSync(tmp, DATA_FILE); // atómico en mismo filesystem
+}
+
+function record({ type, provider }) {
+  const s = load();
+
+  if (type === 'sent')       s.total_sent++;
+  else if (type === 'redirected') s.total_redirected++;
+  else if (type === 'error') s.total_errors++;
+  else if (type === 'search') s.total_searches++;
+
+  if (provider && (type === 'sent' || type === 'redirected')) {
+    if (!s.by_provider[provider]) s.by_provider[provider] = { sent: 0, redirected: 0 };
+    if (type === 'sent')       s.by_provider[provider].sent++;
+    if (type === 'redirected') s.by_provider[provider].redirected++;
+  }
+
+  s.updated = new Date().toISOString().slice(0, 10);
+  save(s);
+}
+
+function get() {
+  return load();
+}
+
+module.exports = { record, get };