From f2fb6d24c6bc199efb1d50c49b17e71cd9f9ac88 Mon Sep 17 00:00:00 2001
From: Carlos Narro <carlos@relabtive.com>
Date: Sat, 30 May 2026 19:58:18 +0200
Subject: [PATCH] =?UTF-8?q?Add=20c=C3=A1lculo=20de=20trial=20y=20badge=20d?=
 =?UTF-8?q?e=20plan?=
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---
 mvp/b2c/src/lib/billing/plan.ts    | 19 +++++++++++++++++++
 mvp/b2c/tests/billing/plan.test.ts | 21 +++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 mvp/b2c/src/lib/billing/plan.ts
 create mode 100644 mvp/b2c/tests/billing/plan.test.ts

diff --git a/mvp/b2c/src/lib/billing/plan.ts b/mvp/b2c/src/lib/billing/plan.ts
new file mode 100644
index 0000000..b580057
--- /dev/null
+++ b/mvp/b2c/src/lib/billing/plan.ts
@@ -0,0 +1,19 @@
+export function trialDaysRemaining(trialEndsAt: Date | null, now: Date = new Date()): number {
+  if (!trialEndsAt) return 0;
+  const ms = trialEndsAt.getTime() - now.getTime();
+  if (ms <= 0) return 0;
+  return Math.ceil(ms / (24 * 60 * 60 * 1000));
+}
+
+export function formatPlanBadge(
+  planNombre: string | null,
+  status: string,
+  trialEndsAt: Date | null,
+  now: Date = new Date()
+): string {
+  const plan = planNombre ? `Plan ${planNombre}` : 'Sin plan';
+  if (status === 'trial') {
+    return `${plan} · trial, ${trialDaysRemaining(trialEndsAt, now)} días restantes`;
+  }
+  return `${plan} · ${status}`;
+}
diff --git a/mvp/b2c/tests/billing/plan.test.ts b/mvp/b2c/tests/billing/plan.test.ts
new file mode 100644
index 0000000..18e56c3
--- /dev/null
+++ b/mvp/b2c/tests/billing/plan.test.ts
@@ -0,0 +1,21 @@
+import { describe, it, expect } from 'vitest';
+import { trialDaysRemaining, formatPlanBadge } from '@/lib/billing/plan';
+
+describe('plan', () => {
+  it('calcula días de trial restantes (redondeo hacia arriba, nunca negativo)', () => {
+    const now = new Date('2026-05-30T12:00:00Z');
+    expect(trialDaysRemaining(new Date('2026-06-05T12:00:00Z'), now)).toBe(6);
+    expect(trialDaysRemaining(new Date('2026-05-30T18:00:00Z'), now)).toBe(1);
+    expect(trialDaysRemaining(new Date('2026-05-29T12:00:00Z'), now)).toBe(0);
+    expect(trialDaysRemaining(null, now)).toBe(0);
+  });
+
+  it('formatea el badge según estado', () => {
+    const now = new Date('2026-05-30T12:00:00Z');
+    expect(formatPlanBadge('Pro', 'trial', new Date('2026-06-05T12:00:00Z'), now))
+      .toBe('Plan Pro · trial, 6 días restantes');
+    expect(formatPlanBadge('Pro', 'activo', null, now)).toBe('Plan Pro · activo');
+    expect(formatPlanBadge(null, 'trial', new Date('2026-06-05T12:00:00Z'), now))
+      .toBe('Sin plan · trial, 6 días restantes');
+  });
+});