v1.7.0: piani Basic/Pro/Premium/Annual + quota giornaliera

Pricing model: subscription mensili (Basic 2.99 / Pro 5.99 / Premium 9.99)
piu' Annual 49.90 one-time. Feature gating per piano (Basic = solo audio,
Pro+ = tutto). Quota giornaliera (10/30/150) con reset mezzanotte Europe/Rome.

Server: tabella daily_usage, endpoint /api/usage/consume e /status,
webhook LS gestisce subscription_* events + mappatura variant_id -> plan
via .env (LS_VARIANT_BASIC|PRO|PREMIUM|ANNUAL).

Client: gating tab in sidebar in base ai features del piano, contatore
"X/Y oggi" + bottone Upgrade, modal blocco con CTA verso landing.

server/src/email.js

@@ -1,21 +1,72 @@
 /**
- * Invio email transazionali via Resend (https://resend.com).
- * Usa fetch nativo di Node >= 20 — nessuna dipendenza.
+ * Invio email transazionali via Resend.
+ *
+ * sendLicenseEmail(to, key, { plan, expiresAt, periodEnd })
+ *   - plan: codice piano ("basic" | "pro" | "premium" | "annual")
+ *   - expiresAt: epoch seconds (annual one-time) o null
+ *   - periodEnd: epoch seconds (subscription mensile) o null
  *
  * Variabili env richieste:
  *   RESEND_API_KEY     dal dashboard Resend
  *   EMAIL_FROM         "MusicTools <noreply@djluza.com>" (dominio verificato)
  */
 
+import { getPlan } from "./plans.js";
+
 const FROM = process.env.EMAIL_FROM || "MusicTools <noreply@djluza.com>";
 const BASE = process.env.PUBLIC_BASE_URL || "https://musictools.djluza.com";
 
-export async function sendLicenseEmail(to, licenseKey) {
+function fmtItalianDate(epochSeconds) {
+  if (!epochSeconds) return "";
+  const d = new Date(Number(epochSeconds) * 1000);
+  return new Intl.DateTimeFormat("it-IT", {
+    timeZone: "Europe/Rome",
+    day: "2-digit",
+    month: "long",
+    year: "numeric",
+  }).format(d);
+}
+
+function describePlan(planCode, expiresAt, periodEnd) {
+  const p = getPlan(planCode);
+  if (!p) {
+    return {
+      name: "MusicTools",
+      summary: "La tua licenza e' attiva.",
+    };
+  }
+  const features = {
+    audio: "download brani audio",
+    video: "download video",
+    record: "registrazione audio",
+    metadata: "editor metadati",
+    upgrade: "upgrade qualita' libreria",
+  };
+  const featList = p.features.map((f) => features[f] || f).join(", ");
+  const limit = p.daily_limit === null
+    ? "senza limiti giornalieri"
+    : `fino a ${p.daily_limit} download al giorno`;
+  let validity = "";
+  if (planCode === "annual" && expiresAt) {
+    validity = `Validita': 1 anno, scade il <strong>${fmtItalianDate(expiresAt)}</strong>.`;
+  } else if (p.is_subscription && periodEnd) {
+    validity = `Prossimo rinnovo: <strong>${fmtItalianDate(periodEnd)}</strong>.`;
+  }
+  return {
+    name: p.name,
+    summary: `Piano <strong>${p.name}</strong> &mdash; ${limit}. Funzioni incluse: ${featList}. ${validity}`,
+  };
+}
+
+export async function sendLicenseEmail(to, licenseKey, opts = {}) {
   if (!process.env.RESEND_API_KEY) {
     console.warn("[email] RESEND_API_KEY non impostata, skip invio a", to);
     return;
   }
 
+  const { plan: planCode, expiresAt, periodEnd } = opts;
+  const planInfo = describePlan(planCode, expiresAt, periodEnd);
+
   const q = `key=${encodeURIComponent(licenseKey)}&email=${encodeURIComponent(to)}`;
   const macUrl = `${BASE}/api/download/macos?${q}`;
   const winUrl = `${BASE}/api/download/windows?${q}`;
@@ -23,8 +74,11 @@ export async function sendLicenseEmail(to, licenseKey) {
   const html = `
     <div style="font-family:-apple-system,Segoe UI,sans-serif;max-width:560px;margin:0 auto;padding:24px;color:#111">
       <h1 style="color:#1db954;margin:0 0 14px;font-size:22px">Grazie per aver scelto MusicTools!</h1>
+      <p style="font-size:15px;line-height:1.55;margin:0 0 14px">
+        ${planInfo.summary}
+      </p>
       <p style="font-size:15px;line-height:1.55;margin:0 0 18px">
-        Ecco la tua chiave di licenza. Conservala con cura — ti servira' per attivare l'app.
+        Ecco la tua chiave di licenza. Conservala con cura &mdash; ti servira' per attivare l'app.
       </p>
       <p style="font-size:22px;letter-spacing:2px;font-family:monospace;background:#f4f4f4;padding:16px;border-radius:10px;text-align:center;margin:0 0 24px;color:#000">
         ${licenseKey}
@@ -35,12 +89,12 @@ export async function sendLicenseEmail(to, licenseKey) {
         <tr>
           <td style="padding-right:10px">
             <a href="${macUrl}" style="display:inline-block;background:#1db954;color:#fff;text-decoration:none;padding:12px 22px;border-radius:999px;font-weight:700;font-size:14px">
-              🍎 Scarica per Mac
+              Scarica per Mac
             </a>
           </td>
           <td>
             <a href="${winUrl}" style="display:inline-block;background:#1db954;color:#fff;text-decoration:none;padding:12px 22px;border-radius:999px;font-weight:700;font-size:14px">
-              🪟 Scarica per Windows
+              Scarica per Windows
             </a>
           </td>
         </tr>
@@ -49,7 +103,7 @@ export async function sendLicenseEmail(to, licenseKey) {
       <p style="font-size:15px;margin:0 0 8px"><strong>Come attivare:</strong></p>
       <ol style="font-size:14.5px;line-height:1.6;padding-left:22px">
         <li>Clicca uno dei bottoni qui sopra per scaricare l'installer</li>
-        <li>Installa l'app (su Mac: tasto destro → Apri → Apri; su Windows: Esegui comunque)</li>
+        <li>Installa l'app (su Mac: tasto destro &rarr; Apri &rarr; Apri; su Windows: Esegui comunque)</li>
         <li>Apri MusicTools: la prima schermata ti chiede email e chiave</li>
         <li>Inserisci <strong>${to}</strong> e la chiave qui sopra</li>
       </ol>
@@ -62,6 +116,10 @@ export async function sendLicenseEmail(to, licenseKey) {
     </div>
   `;
 
+  const subject = planInfo.name === "MusicTools"
+    ? "La tua licenza MusicTools"
+    : `La tua licenza MusicTools ${planInfo.name}`;
+
   const resp = await fetch("https://api.resend.com/emails", {
     method: "POST",
     headers: {
@@ -71,7 +129,7 @@ export async function sendLicenseEmail(to, licenseKey) {
     body: JSON.stringify({
       from: FROM,
       to: [to],
-      subject: "La tua licenza MusicTools",
+      subject,
       html,
     }),
   });