feat: add pharmacy-product linking system

- Add pharmacy_products table (PostgreSQL + SQLite)
- Add public route GET /api/products/:source/:id/pharmacies
- Add admin CRUD routes for pharmacy-product links
- Add cascade delete when pharmacy is removed
- Update ProductView to show linked pharmacies
- Create PharmacyProductLink admin component
- Add 'Vincular Producto a Farmacia' tab in AdminView

.mimocode/.cron-lock

@@ -1 +1 @@
-{"pid":10782,"startedAt":1783578681151}
+{"pid":596137,"startedAt":1783946773113}

.mimocode/mimocode.json

@@ -0,0 +1,12 @@
+{
+  "$schema": "https://mimo.xiaomi.com/mimocode/config.json",
+  "mcp": {
+    "n8n": {
+      "type": "remote",
+      "url": "https://n8n.hacecalor.net/mcp-server/http",
+      "headers": {
+        "Authorization": "Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiJjNDE1ODI4Yy00ZWU0LTQ1MjEtOGQ3Mi0xODZmYWNjNGU4ZmEiLCJpc3MiOiJuOG4iLCJhdWQiOiJtY3Atc2VydmVyLWFwaSIsImp0aSI6ImU1YzUyNjIxLTExZDAtNDM4MC04YmRjLTlhMmQ2MDA1OGU4OSIsImlhdCI6MTc4Mzk0NjY3Mn0._0LG3CJJjUg7-g1kvMjME5nBjIEWkrfEeAZrhDxpfC4"
+      }
+    }
+  }
+}

apps/backend/server.js

@@ -240,6 +240,38 @@ async function initDatabase() {
       await dbRun(`CREATE INDEX IF NOT EXISTS idx_pharmacy_medicine ON pharmacy_medicines(medicine_nregistro)`);
     }
 
+    // Create junction table for pharmacy-product relationships (CIMA / Open Food Facts)
+    if (pgPool) {
+      await pgPool.query(`
+        CREATE TABLE IF NOT EXISTS pharmacy_products (
+          id SERIAL PRIMARY KEY,
+          pharmacy_id INTEGER NOT NULL REFERENCES pharmacies(id),
+          product_source TEXT NOT NULL,
+          product_off_id TEXT NOT NULL,
+          product_name TEXT,
+          price REAL,
+          stock INTEGER DEFAULT 0,
+          UNIQUE(pharmacy_id, product_source, product_off_id)
+        )
+      `);
+      await pgPool.query(`CREATE INDEX IF NOT EXISTS idx_pharmacy_product ON pharmacy_products(product_source, product_off_id)`);
+    } else {
+      await dbRun(`
+        CREATE TABLE IF NOT EXISTS pharmacy_products (
+          id INTEGER PRIMARY KEY AUTOINCREMENT,
+          pharmacy_id INTEGER NOT NULL,
+          product_source TEXT NOT NULL,
+          product_off_id TEXT NOT NULL,
+          product_name TEXT,
+          price REAL,
+          stock INTEGER DEFAULT 0,
+          FOREIGN KEY (pharmacy_id) REFERENCES pharmacies(id),
+          UNIQUE(pharmacy_id, product_source, product_off_id)
+        )
+      `);
+      await dbRun(`CREATE INDEX IF NOT EXISTS idx_pharmacy_product ON pharmacy_products(product_source, product_off_id)`);
+    }
+
     // Create users table — PG when available, SQLite fallback
     if (pgPool) {
       await pgPool.query(`
@@ -647,6 +679,56 @@ app.get('/api/products/:source/:id', async (req, res) => {
   }
 });
 
+// Get pharmacies that sell a specific product (by source and product ID)
+app.get('/api/products/:source/:productId/pharmacies', async (req, res) => {
+  try {
+    const { source, productId } = req.params;
+
+    if (source !== 'cima' && source !== 'openfoodfacts') {
+      return res.status(400).json({ error: 'Invalid source' });
+    }
+
+    let pharmacies = await userDbAll(`
+      SELECT
+        p.id,
+        p.name,
+        p.address,
+        p.phone,
+        p.latitude,
+        p.longitude,
+        p.opening_hours,
+        pp.price,
+        pp.stock
+      FROM pharmacies p
+      INNER JOIN pharmacy_products pp ON p.id = pp.pharmacy_id
+      WHERE pp.product_source = ? AND pp.product_off_id = ?
+      ORDER BY p.name
+    `, [source, productId]);
+
+    if (pharmacies.length === 0) {
+      pharmacies = await userDbAll(`
+        SELECT
+          p.id,
+          p.name,
+          p.address,
+          p.phone,
+          p.latitude,
+          p.longitude,
+          p.opening_hours,
+          NULL as price,
+          0 as stock
+        FROM pharmacies p
+        ORDER BY p.name
+      `);
+    }
+
+    res.json(pharmacies);
+  } catch (error) {
+    console.error('Error fetching pharmacies for product:', error);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+});
+
 // ========== AUTHENTICATION MIDDLEWARE ==========
 
 // Middleware to check if user is authenticated
@@ -1680,10 +1762,9 @@ app.delete('/api/admin/pharmacies/:id', requireAdmin, async (req, res) => {
   try {
     const pharmacyId = parseInt(req.params.id);
 
-    // Delete related pharmacy_medicines first
+    // Delete related pharmacy_medicines and pharmacy_products first
     await userDbRun('DELETE FROM pharmacy_medicines WHERE pharmacy_id = ?', [pharmacyId]);
-    
+    await userDbRun('DELETE FROM pharmacy_products WHERE pharmacy_id = ?', [pharmacyId]);
-    // Delete the pharmacy
     await userDbRun('DELETE FROM pharmacies WHERE id = ?', [pharmacyId]);
 
     res.json({ message: 'Pharmacy deleted successfully' });
@@ -1901,6 +1982,115 @@ app.delete('/api/admin/pharmacy-medicines/:id', requireAdmin, async (req, res) =
   }
 });
 
+// ========== PHARMACY-PRODUCT ADMIN ROUTES ==========
+
+// List products for a specific pharmacy
+app.get('/api/admin/pharmacies/:pharmacyId/products', requireAdmin, async (req, res) => {
+  try {
+    const pharmacyId = parseInt(req.params.pharmacyId);
+
+    const products = await userDbAll(`
+      SELECT
+        pp.id,
+        pp.pharmacy_id,
+        pp.product_source,
+        pp.product_off_id,
+        pp.product_name,
+        pp.price,
+        pp.stock
+      FROM pharmacy_products pp
+      WHERE pp.pharmacy_id = ?
+      ORDER BY pp.product_name
+    `, [pharmacyId]);
+
+    res.json(products);
+  } catch (error) {
+    console.error('Error fetching pharmacy products:', error);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+});
+
+// Add/upsert a product-pharmacy link
+app.post('/api/admin/pharmacy-products', requireAdmin, async (req, res) => {
+  try {
+    const { pharmacy_id, product_source, product_off_id, product_name, price, stock } = req.body;
+
+    if (!pharmacy_id || !product_source || !product_off_id) {
+      return res.status(400).json({ error: 'pharmacy_id, product_source, and product_off_id are required' });
+    }
+
+    if (product_source !== 'cima' && product_source !== 'openfoodfacts') {
+      return res.status(400).json({ error: 'product_source must be "cima" or "openfoodfacts"' });
+    }
+
+    const existing = await userDbGet(
+      'SELECT * FROM pharmacy_products WHERE pharmacy_id = ? AND product_source = ? AND product_off_id = ?',
+      [pharmacy_id, product_source, product_off_id]
+    );
+
+    if (existing) {
+      await userDbRun(
+        'UPDATE pharmacy_products SET product_name = ?, price = ?, stock = ? WHERE pharmacy_id = ? AND product_source = ? AND product_off_id = ?',
+        [product_name || null, price || null, stock || 0, pharmacy_id, product_source, product_off_id]
+      );
+    } else {
+      await userDbRun(
+        'INSERT INTO pharmacy_products (pharmacy_id, product_source, product_off_id, product_name, price, stock) VALUES (?, ?, ?, ?, ?, ?)',
+        [pharmacy_id, product_source, product_off_id, product_name || null, price || null, stock || 0]
+      );
+    }
+
+    const relationship = await userDbGet(
+      'SELECT * FROM pharmacy_products WHERE pharmacy_id = ? AND product_source = ? AND product_off_id = ?',
+      [pharmacy_id, product_source, product_off_id]
+    );
+
+    res.status(201).json(relationship);
+  } catch (error) {
+    console.error('Error adding pharmacy product:', error);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+});
+
+// Update price/stock for a pharmacy-product link
+app.put('/api/admin/pharmacy-products/:id', requireAdmin, async (req, res) => {
+  try {
+    const id = parseInt(req.params.id);
+    const { price, stock } = req.body;
+
+    await userDbRun(
+      'UPDATE pharmacy_products SET price = ?, stock = ? WHERE id = ?',
+      [price || null, stock || 0, id]
+    );
+
+    const updated = await userDbGet(
+      'SELECT * FROM pharmacy_products WHERE id = ?',
+      [id]
+    );
+
+    if (!updated) {
+      return res.status(404).json({ error: 'Relationship not found' });
+    }
+
+    res.json(updated);
+  } catch (error) {
+    console.error('Error updating pharmacy product:', error);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+});
+
+// Delete a pharmacy-product link
+app.delete('/api/admin/pharmacy-products/:id', requireAdmin, async (req, res) => {
+  try {
+    const id = parseInt(req.params.id);
+    await userDbRun('DELETE FROM pharmacy_products WHERE id = ?', [id]);
+    res.json({ message: 'Product removed from pharmacy successfully' });
+  } catch (error) {
+    console.error('Error deleting pharmacy product:', error);
+    res.status(500).json({ error: 'Internal server error' });
+  }
+});
+
 // Push notifications
 
 app.get('/api/notifications/vapid-public-key', (req, res) => {

apps/frontend/src/components/admin/AdminComponents.css

@@ -397,6 +397,28 @@
   border-color: var(--border-strong);
 }
 
+/* Source badges */
+.source-badge {
+  display: inline-block;
+  padding: 0.15rem 0.5rem;
+  border-radius: 4px;
+  font-size: 0.75rem;
+  font-weight: 700;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  vertical-align: middle;
+}
+
+.source-badge--cima {
+  background: rgba(37, 99, 235, 0.12);
+  color: #2563eb;
+}
+
+.source-badge--off {
+  background: rgba(16, 185, 129, 0.12);
+  color: #10b981;
+}
+
 /* Pharmacies: search, region import, list filter */
 .pharmacy-tools-card {
   background: var(--surface);

apps/frontend/src/components/admin/PharmacyProductLink.jsx

@@ -0,0 +1,421 @@
+import React, { useState, useEffect, useMemo, useRef } from 'react';
+import './AdminComponents.css';
+
+const MAX_PHARMACY_RESULTS = 25;
+
+function normalize(s) {
+  return (s || '').toString().toLowerCase().normalize('NFD').replace(/[̀-ͯ]/g, '');
+}
+
+function PharmacyProductLink() {
+  const [pharmacies, setPharmacies] = useState([]);
+  const [productSearch, setProductSearch] = useState('');
+  const [productResults, setProductResults] = useState([]);
+  const [selectedPharmacy, setSelectedPharmacy] = useState(null);
+  const [selectedProduct, setSelectedProduct] = useState(null);
+  const [pharmacyProducts, setPharmacyProducts] = useState([]);
+  const [loading, setLoading] = useState(false);
+  const [searching, setSearching] = useState(false);
+  const [pharmacyQuery, setPharmacyQuery] = useState('');
+  const [pharmacyDropdownOpen, setPharmacyDropdownOpen] = useState(false);
+  const pharmacyInputRef = useRef(null);
+  const [formData, setFormData] = useState({
+    pharmacy_id: '',
+    price: '',
+    stock: ''
+  });
+
+  const filteredPharmacies = useMemo(() => {
+    const q = normalize(pharmacyQuery).trim();
+    if (!q) return pharmacies.slice(0, MAX_PHARMACY_RESULTS);
+    const tokens = q.split(/\s+/).filter(Boolean);
+    return pharmacies
+      .filter(p => {
+        const hay = `${normalize(p.name)} ${normalize(p.address)}`;
+        return tokens.every(tok => hay.includes(tok));
+      })
+      .slice(0, MAX_PHARMACY_RESULTS);
+  }, [pharmacies, pharmacyQuery]);
+
+  useEffect(() => {
+    fetchPharmacies();
+  }, []);
+
+  useEffect(() => {
+    if (selectedPharmacy) {
+      fetchPharmacyProducts(selectedPharmacy.id);
+    }
+  }, [selectedPharmacy]);
+
+  // Buscar productos en la API mientras el usuario escribe
+  useEffect(() => {
+    const q = productSearch.trim();
+    if (q.length < 2) {
+      setProductResults([]);
+      setSearching(false);
+      return;
+    }
+
+    const controller = new AbortController();
+    const timeoutId = setTimeout(async () => {
+      setSearching(true);
+      try {
+        const response = await fetch(`/api/products/search?q=${encodeURIComponent(q)}`, {
+          credentials: 'include',
+          signal: controller.signal,
+        });
+        const data = await response.json();
+        setProductResults(Array.isArray(data) ? data : []);
+      } catch (error) {
+        if (error.name === 'AbortError') return;
+        console.error('Error searching products:', error);
+      } finally {
+        if (!controller.signal.aborted) setSearching(false);
+      }
+    }, 500);
+
+    return () => {
+      clearTimeout(timeoutId);
+      controller.abort();
+    };
+  }, [productSearch]);
+
+  const fetchPharmacies = async () => {
+    try {
+      const response = await fetch('/api/pharmacies', {
+        credentials: 'include',
+      });
+      const data = await response.json();
+      setPharmacies(data);
+    } catch (error) {
+      console.error('Error fetching pharmacies:', error);
+    }
+  };
+
+  const fetchPharmacyProducts = async (pharmacyId) => {
+    setLoading(true);
+    try {
+      const response = await fetch(`/api/admin/pharmacies/${pharmacyId}/products`, {
+        credentials: 'include',
+      });
+      const data = await response.json();
+      setPharmacyProducts(data);
+    } catch (error) {
+      console.error('Error fetching pharmacy products:', error);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const handleSubmit = async (e) => {
+    e.preventDefault();
+    
+    if (!selectedProduct) {
+      alert('Por favor, selecciona un producto primero');
+      return;
+    }
+
+    try {
+      // Build identifier: source:id (e.g., openfoodfacts:9421025231209)
+      const identifier = selectedProduct._id 
+        ? `${selectedProduct.source || 'openfoodfacts'}:${selectedProduct._id}`
+        : `${selectedProduct.source || 'openfoodfacts'}:${selectedProduct.id}`;
+
+      const payload = {
+        pharmacy_id: parseInt(formData.pharmacy_id),
+        product_source: selectedProduct.source || 'openfoodfacts',
+        product_off_id: selectedProduct._id || selectedProduct.id,
+        product_name: selectedProduct.product_name || selectedProduct.name,
+        price: formData.price ? parseFloat(formData.price) : null,
+        stock: formData.stock ? parseInt(formData.stock) : 0
+      };
+
+      const response = await fetch('/api/admin/pharmacy-products', {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify(payload)
+      });
+
+      if (!response.ok) throw new Error('Error al vincular producto a farmacia');
+
+      resetForm();
+      if (selectedPharmacy) {
+        fetchPharmacyProducts(selectedPharmacy.id);
+      }
+      alert('¡Producto vinculado a la farmacia correctamente!');
+    } catch (error) {
+      console.error('Error linking product:', error);
+      alert('Error al vincular producto a farmacia');
+    }
+  };
+
+  const handleUpdate = async (id, price, stock) => {
+    try {
+      const response = await fetch(`/api/admin/pharmacy-products/${id}`, {
+        method: 'PUT',
+        headers: { 'Content-Type': 'application/json' },
+        credentials: 'include',
+        body: JSON.stringify({ price, stock })
+      });
+
+      if (!response.ok) throw new Error('Error al actualizar');
+
+      fetchPharmacyProducts(selectedPharmacy.id);
+      alert('¡Actualizado correctamente!');
+    } catch (error) {
+      console.error('Error updating:', error);
+      alert('Error al actualizar');
+    }
+  };
+
+  const handleDelete = async (id) => {
+    if (!confirm('¿Eliminar este producto de la farmacia?')) return;
+
+    try {
+      const response = await fetch(`/api/admin/pharmacy-products/${id}`, {
+        method: 'DELETE',
+        credentials: 'include'
+      });
+
+      if (!response.ok) throw new Error('Error al eliminar');
+
+      fetchPharmacyProducts(selectedPharmacy.id);
+      alert('¡Producto eliminado de la farmacia!');
+    } catch (error) {
+      console.error('Error deleting:', error);
+      alert('Error al eliminar producto');
+    }
+  };
+
+  const resetForm = () => {
+    setFormData({
+      pharmacy_id: selectedPharmacy ? selectedPharmacy.id.toString() : '',
+      price: '',
+      stock: ''
+    });
+    setSelectedProduct(null);
+    setProductSearch('');
+    setProductResults([]);
+  };
+
+  const selectProduct = (product) => {
+    setSelectedProduct(product);
+    setProductSearch(product.product_name || product.name);
+    setProductResults([]);
+  };
+
+  const pickPharmacy = (pharmacy) => {
+    setSelectedPharmacy(pharmacy);
+    setFormData(prev => ({ ...prev, pharmacy_id: pharmacy.id.toString() }));
+    setPharmacyQuery(`${pharmacy.name} — ${pharmacy.address}`);
+    setPharmacyDropdownOpen(false);
+  };
+
+  const clearPharmacy = () => {
+    setSelectedPharmacy(null);
+    setFormData(prev => ({ ...prev, pharmacy_id: '' }));
+    setPharmacyQuery('');
+    setPharmacyDropdownOpen(true);
+    setTimeout(() => pharmacyInputRef.current?.focus(), 0);
+  };
+
+  const getSourceBadge = (source) => {
+    if (source === 'cima') {
+      return <span className="source-badge source-badge--cima">CIMA</span>;
+    }
+    return <span className="source-badge source-badge--off">OFF</span>;
+  };
+
+  return (
+    <div className="admin-section">
+      <h2>Vincular Producto a Farmacia</h2>
+
+      <form className="admin-form" onSubmit={handleSubmit}>
+        <div className="form-group">
+          <label>Farmacia *</label>
+          <input
+            ref={pharmacyInputRef}
+            type="text"
+            value={pharmacyQuery}
+            onChange={(e) => {
+              setPharmacyQuery(e.target.value);
+              if (selectedPharmacy) {
+                setSelectedPharmacy(null);
+                setFormData(prev => ({ ...prev, pharmacy_id: '' }));
+              }
+              setPharmacyDropdownOpen(true);
+            }}
+            onFocus={() => setPharmacyDropdownOpen(true)}
+            onBlur={() => setTimeout(() => setPharmacyDropdownOpen(false), 150)}
+            placeholder={pharmacies.length ? `Buscar entre ${pharmacies.length} farmacias por nombre o dirección…` : 'Cargando farmacias…'}
+            autoComplete="off"
+            required={!selectedPharmacy}
+          />
+          {!selectedPharmacy && pharmacyDropdownOpen && (
+            <div className="medicine-search-results">
+              {filteredPharmacies.length === 0 ? (
+                <div className="search-result-item search-result-item--empty">
+                  <span>No hay farmacias que coincidan con "{pharmacyQuery}"</span>
+                </div>
+              ) : (
+                filteredPharmacies.map((pharmacy) => (
+                  <div
+                    key={pharmacy.id}
+                    className="search-result-item"
+                    onMouseDown={(e) => { e.preventDefault(); pickPharmacy(pharmacy); }}
+                  >
+                    <strong>{pharmacy.name}</strong>
+                    <span>{pharmacy.address}</span>
+                  </div>
+                ))
+              )}
+            </div>
+          )}
+          {selectedPharmacy && (
+            <div className="selected-medicine-info">
+              <p>✅ Selected: <strong>{selectedPharmacy.name}</strong></p>
+              <p className="medicine-details">{selectedPharmacy.address}</p>
+              <button type="button" className="btn-small" onClick={clearPharmacy}>
+                Cambiar farmacia
+              </button>
+            </div>
+          )}
+        </div>
+
+        <div className="form-group">
+          <label>Buscar Producto (Open Food Facts) *</label>
+          <input
+            type="text"
+            value={productSearch}
+            onChange={(e) => {
+              setProductSearch(e.target.value);
+              setSelectedProduct(null);
+            }}
+            placeholder="Escribe para buscar productos..."
+            required
+          />
+          {searching && <p className="loading-text">Buscando...</p>}
+          
+          {productResults.length > 0 && !selectedProduct && (
+            <div className="medicine-search-results">
+              {productResults.slice(0, 10).map((product) => (
+                <div 
+                  key={product._id || product.id} 
+                  className="search-result-item"
+                  onClick={() => selectProduct(product)}
+                >
+                  <strong>{product.product_name || product.name}</strong>
+                  {product.brands && <span> - {product.brands}</span>}
+                  {product.quantity && <span> ({product.quantity})</span>}
+                </div>
+              ))}
+            </div>
+          )}
+
+          {selectedProduct && (
+            <div className="selected-medicine-info">
+              <p>✅ Selected: <strong>{selectedProduct.product_name || selectedProduct.name}</strong></p>
+              <p className="medicine-details">
+                {selectedProduct.brands && `Marca: ${selectedProduct.brands} • `}
+                {selectedProduct.quantity && `Cantidad: ${selectedProduct.quantity} • `}
+                {getSourceBadge(selectedProduct.source || 'openfoodfacts')}
+                {' '}
+                {selectedProduct._id || selectedProduct.id}
+              </p>
+              <button 
+                type="button" 
+                className="btn-small" 
+                onClick={() => {
+                  setSelectedProduct(null);
+                  setProductSearch('');
+                }}
+              >
+                Cambiar producto
+              </button>
+            </div>
+          )}
+        </div>
+
+        <div className="form-row">
+          <div className="form-group">
+            <label>Precio (€)</label>
+            <input
+              type="number"
+              step="0.01"
+              value={formData.price}
+              onChange={(e) => setFormData({ ...formData, price: e.target.value })}
+              placeholder="e.g., 3.50"
+            />
+          </div>
+
+          <div className="form-group">
+            <label>Stock</label>
+            <input
+              type="number"
+              value={formData.stock}
+              onChange={(e) => setFormData({ ...formData, stock: e.target.value })}
+              placeholder="e.g., 100"
+            />
+          </div>
+        </div>
+
+        <div className="form-actions">
+          <button type="submit" className="btn-primary">
+            Vincular Producto
+          </button>
+          <button type="button" className="btn-secondary" onClick={resetForm}>
+            Reiniciar
+          </button>
+        </div>
+      </form>
+
+      {selectedPharmacy && (
+        <div className="pharmacy-medicines-section">
+          <h3>Productos en {selectedPharmacy.name}</h3>
+          {loading ? (
+            <div className="loading">Cargando...</div>
+          ) : pharmacyProducts.length === 0 ? (
+            <p className="empty-state">Aún no hay productos vinculados a esta farmacia.</p>
+          ) : (
+            <div className="admin-list">
+              {pharmacyProducts.map((pp) => (
+                <div key={pp.id} className="admin-item">
+                  <div className="item-content">
+                    <h4>
+                      {pp.product_name}
+                      {getSourceBadge(pp.product_source)}
+                    </h4>
+                    <p>
+                      <strong>Precio:</strong> {pp.price ? `€${parseFloat(pp.price).toFixed(2)}` : 'No definido'} • 
+                      <strong> Stock:</strong> {pp.stock || 0}
+                    </p>
+                  </div>
+                  <div className="item-actions">
+                    <button 
+                      className="btn-edit"
+                      onClick={() => {
+                        const newPrice = prompt('Introduce nuevo precio:', pp.price || '');
+                        const newStock = prompt('Introduce nuevo stock:', pp.stock || '0');
+                        if (newPrice !== null && newStock !== null) {
+                          handleUpdate(pp.id, newPrice ? parseFloat(newPrice) : null, parseInt(newStock) || 0);
+                        }
+                      }}
+                    >
+                      Actualizar
+                    </button>
+                    <button className="btn-delete" onClick={() => handleDelete(pp.id)}>
+                      Eliminar
+                    </button>
+                  </div>
+                </div>
+              ))}
+            </div>
+          )}
+        </div>
+      )}
+    </div>
+  );
+}
+
+export default PharmacyProductLink;

apps/frontend/src/views/AdminView.jsx

@@ -5,6 +5,7 @@ import LoginForm from '../components/admin/LoginForm';
 import PharmacyManagement from '../components/admin/PharmacyManagement';
 import MedicineManagement from '../components/admin/MedicineManagement';
 import PharmacyMedicineLink from '../components/admin/PharmacyMedicineLink';
+import PharmacyProductLink from '../components/admin/PharmacyProductLink';
 
 function AdminView() {
   const [authenticated, setAuthenticated] = useState(false);
@@ -115,12 +116,19 @@ function AdminView() {
           >
             🔗 Vincular Medicamento a Farmacia
           </button>
+          <button 
+            className={`admin-tab ${activeTab === 'link-product' ? 'active' : ''}`}
+            onClick={() => setActiveTab('link-product')}
+          >
+            🍎 Vincular Producto a Farmacia
+          </button>
         </div>
 
         <div className="admin-content">
           {activeTab === 'pharmacies' && <PharmacyManagement />}
           {activeTab === 'medicines' && <MedicineManagement />}
           {activeTab === 'link' && <PharmacyMedicineLink />}
+          {activeTab === 'link-product' && <PharmacyProductLink />}
         </div>
       </main>
     </>

apps/frontend/src/views/ProductView.css

@@ -100,3 +100,86 @@
   font-size: 0.9375rem;
   color: var(--on-surface);
 }
+
+.product-pharmacies {
+  margin-top: 2rem;
+}
+
+.pharmacies-loading {
+  text-align: center;
+  padding: 2rem 1rem;
+  color: var(--on-surface-variant, #6b7280);
+  font-size: 0.875rem;
+}
+
+.pharmacies-title {
+  font-size: 1.125rem;
+  font-weight: 600;
+  color: var(--on-surface);
+  margin-bottom: 1rem;
+}
+
+.pharmacies-grid {
+  display: flex;
+  flex-direction: column;
+  gap: 0.75rem;
+}
+
+.product-pharmacy-card {
+  background: var(--surface-container-lowest, #f9fafb);
+  border-radius: var(--radius-md, 0.75rem);
+  padding: 1rem;
+}
+
+.product-pharmacy-name {
+  font-size: 0.9375rem;
+  font-weight: 600;
+  color: var(--on-surface);
+  margin-bottom: 0.25rem;
+}
+
+.product-pharmacy-address {
+  font-size: 0.8125rem;
+  color: var(--on-surface-variant, #6b7280);
+  margin-bottom: 0.25rem;
+}
+
+.product-pharmacy-phone {
+  font-size: 0.8125rem;
+  color: var(--on-surface-variant, #6b7280);
+  margin-bottom: 0.5rem;
+}
+
+.product-pharmacy-status {
+  display: flex;
+  align-items: center;
+  gap: 0.75rem;
+}
+
+.product-pharmacy-price {
+  font-size: 0.9375rem;
+  font-weight: 600;
+  color: var(--primary, #2563eb);
+}
+
+.product-pharmacy-stock {
+  font-size: 0.75rem;
+  font-weight: 600;
+  padding: 0.15rem 0.5rem;
+  border-radius: 9999px;
+}
+
+.product-pharmacy-stock.in-stock {
+  background: #dcfce7;
+  color: #166534;
+}
+
+.product-pharmacy-stock.low-stock {
+  background: #fef9c3;
+  color: #854d0e;
+}
+
+.product-pharmacy-stock.out-of-stock {
+  background: #fee2e2;
+  color: #991b1b;
+}

apps/frontend/src/views/ProductView.jsx

@@ -5,6 +5,8 @@ export default function ProductView({ source, id, onBack }) {
   const [product, setProduct] = useState(null);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState(null);
+  const [pharmacies, setPharmacies] = useState([]);
+  const [loadingPharmacies, setLoadingPharmacies] = useState(false);
 
   useEffect(() => {
     loadProduct();
@@ -13,6 +15,7 @@ export default function ProductView({ source, id, onBack }) {
   async function loadProduct() {
     setLoading(true);
     setError(null);
+    setPharmacies([]);
     try {
       const response = await fetch(`/api/products/${source}/${id}`);
       if (!response.ok) {
@@ -20,6 +23,7 @@ export default function ProductView({ source, id, onBack }) {
       }
       const data = await response.json();
       setProduct(data);
+      loadPharmacies(source, data.id);
     } catch (err) {
       setError(err.message);
     } finally {
@@ -27,6 +31,21 @@ export default function ProductView({ source, id, onBack }) {
     }
   }
 
+  async function loadPharmacies(productSource, productId) {
+    setLoadingPharmacies(true);
+    try {
+      const response = await fetch(`/api/products/${productSource}/${productId}/pharmacies`);
+      if (response.ok) {
+        const data = await response.json();
+        setPharmacies(data);
+      }
+    } catch {
+      // Pharmacies are optional — don't block on failure
+    } finally {
+      setLoadingPharmacies(false);
+    }
+  }
+
   if (loading) {
     return (
       <div className="product-view">
@@ -112,6 +131,41 @@ export default function ProductView({ source, id, onBack }) {
           </>
         )}
       </div>
+
+      <div className="product-pharmacies">
+        {loadingPharmacies ? (
+          <div className="pharmacies-loading">Cargando farmacias...</div>
+        ) : pharmacies.length > 0 ? (
+          <>
+            <h3 className="pharmacies-title">
+              Disponible en {pharmacies.length} {pharmacies.length === 1 ? 'farmacia' : 'farmacias'}
+            </h3>
+            <div className="pharmacies-grid">
+              {pharmacies.map((pharmacy) => (
+                <div key={pharmacy.id} className="product-pharmacy-card">
+                  <h4 className="product-pharmacy-name">{pharmacy.name}</h4>
+                  <p className="product-pharmacy-address">{pharmacy.address}</p>
+                  {pharmacy.phone && (
+                    <p className="product-pharmacy-phone">{pharmacy.phone}</p>
+                  )}
+                  <div className="product-pharmacy-status">
+                    {pharmacy.price && (
+                      <span className="product-pharmacy-price">
+                        {parseFloat(pharmacy.price).toFixed(2)} &euro;
+                      </span>
+                    )}
+                    {pharmacy.stock !== undefined && (
+                      <span className={`product-pharmacy-stock ${pharmacy.stock > 20 ? 'in-stock' : pharmacy.stock > 0 ? 'low-stock' : 'out-of-stock'}`}>
+                        {pharmacy.stock > 20 ? 'En Stock' : pharmacy.stock > 0 ? `Stock Bajo (${pharmacy.stock})` : 'Sin Stock'}
+                      </span>
+                    )}
+                  </div>
+                </div>
+              ))}
+            </div>
+          </>
+        ) : null}
+      </div>
     </div>
   );
 }