From 61e0f5dbe5d16f2759c2907311360ba86638e477 Mon Sep 17 00:00:00 2001
From: Carlos Narro <carlos@relabtive.com>
Date: Sat, 30 May 2026 12:20:10 +0200
Subject: [PATCH] feat: resolve unit price from catalog with selection override

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 mvp/b2c/src/budget/resolve.ts        | 18 ++++++++++++++++++
 mvp/b2c/tests/budget/resolve.test.ts | 25 +++++++++++++++++++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 mvp/b2c/src/budget/resolve.ts
 create mode 100644 mvp/b2c/tests/budget/resolve.test.ts

diff --git a/mvp/b2c/src/budget/resolve.ts b/mvp/b2c/src/budget/resolve.ts
new file mode 100644
index 0000000..bfc3291
--- /dev/null
+++ b/mvp/b2c/src/budget/resolve.ts
@@ -0,0 +1,18 @@
+import type { Calidad, CategoriaMaterial, CatalogItem } from './types';
+
+export function resolvePrecioUnitario(
+  categoria: CategoriaMaterial,
+  calidad: Calidad,
+  catalog: CatalogItem[],
+  selections: Partial<Record<CategoriaMaterial, string>>,
+): { item: CatalogItem | null } {
+  const selectedId = selections[categoria];
+  if (selectedId) {
+    const selected = catalog.find((c) => c.id === selectedId);
+    if (selected) return { item: selected };
+  }
+  const def = catalog.find(
+    (c) => c.categoria === categoria && c.calidad === calidad && c.esDefault,
+  );
+  return { item: def ?? null };
+}
diff --git a/mvp/b2c/tests/budget/resolve.test.ts b/mvp/b2c/tests/budget/resolve.test.ts
new file mode 100644
index 0000000..a36fb41
--- /dev/null
+++ b/mvp/b2c/tests/budget/resolve.test.ts
@@ -0,0 +1,25 @@
+import { describe, it, expect } from 'vitest';
+import { resolvePrecioUnitario } from '@/budget/resolve';
+import type { CatalogItem } from '@/budget/types';
+
+const catalog: CatalogItem[] = [
+  { id: 's-media', categoria: 'suelo', nombre: 'Cerámico medio', calidad: 'media', precioUnit: 2800, unidad: 'm2', descriptorRender: 'suelo cerámico gris', esDefault: true, sku: 'SUE-M' },
+  { id: 's-premium', categoria: 'suelo', nombre: 'Porcelánico roble', calidad: 'premium', precioUnit: 4500, unidad: 'm2', descriptorRender: 'porcelánico símil roble', esDefault: true, sku: 'SUE-P' },
+];
+
+describe('resolvePrecioUnitario', () => {
+  it('devuelve el default de la calidad cuando no hay selección', () => {
+    const { item } = resolvePrecioUnitario('suelo', 'media', catalog, {});
+    expect(item?.id).toBe('s-media');
+  });
+
+  it('prioriza la selección exacta sobre la calidad global', () => {
+    const { item } = resolvePrecioUnitario('suelo', 'media', catalog, { suelo: 's-premium' });
+    expect(item?.id).toBe('s-premium');
+  });
+
+  it('devuelve null si no hay default para esa calidad ni selección', () => {
+    const { item } = resolvePrecioUnitario('pared', 'media', catalog, {});
+    expect(item).toBeNull();
+  });
+});