Add top campaign clients endpoint

backend/test/campaignService.test.js

@@ -0,0 +1,93 @@
+const assert = require('node:assert/strict');
+const test = require('node:test');
+
+const withCampaignService = async (queryHandler, callback) => {
+    const dbPath = require.resolve('../db');
+    const servicePath = require.resolve('../services/campaignService');
+    const originalDbCache = require.cache[dbPath];
+    const originalServiceCache = require.cache[servicePath];
+    const queries = [];
+
+    delete require.cache[servicePath];
+    require.cache[dbPath] = {
+        id: dbPath,
+        filename: dbPath,
+        loaded: true,
+        exports: {
+            pool: {
+                query: async (sql, params = []) => {
+                    queries.push({ sql, params });
+                    return queryHandler(sql, params);
+                }
+            }
+        }
+    };
+
+    try {
+        const service = require('../services/campaignService');
+        return await callback(service, queries);
+    } finally {
+        delete require.cache[servicePath];
+        if (originalServiceCache) {
+            require.cache[servicePath] = originalServiceCache;
+        }
+        if (originalDbCache) {
+            require.cache[dbPath] = originalDbCache;
+        } else {
+            delete require.cache[dbPath];
+        }
+    }
+};
+
+test('getTopClientsForCampaign returns top clients for an explicit date range', async () => {
+    await withCampaignService(async () => ({
+        rows: [
+            {
+                nome: 'Cliente A',
+                fone: '5516999999901',
+                total_gasto: '1234.50',
+                total_comprado: '18',
+                total_pedidos: 4,
+                ultima_compra: '2026-07-27'
+            }
+        ]
+    }), async ({ getTopClientsForCampaign }, queries) => {
+        const result = await getTopClientsForCampaign({
+            start: '2026-06-28',
+            end: '2026-07-27',
+            limit: '1000'
+        });
+
+        assert.equal(result.start, '2026-06-28');
+        assert.equal(result.end, '2026-07-27');
+        assert.equal(result.limit, 1000);
+        assert.equal(result.count, 1);
+        assert.deepEqual(result.customers[0], {
+            nome: 'Cliente A',
+            fone: '5516999999901',
+            total_gasto: 1234.5,
+            total_comprado: 18,
+            total_pedidos: 4,
+            ultima_compra: '2026-07-27'
+        });
+
+        assert.equal(queries.length, 1);
+        assert.deepEqual(queries[0].params, ['2026-06-28', '2026-07-27', 1000]);
+        assert.match(queries[0].sql, /customer_key NOT LIKE 'name:%'/);
+        assert.match(queries[0].sql, /ORDER BY total_gasto DESC/);
+    });
+});
+
+test('getTopClientsForCampaign derives an inclusive 30 day range from the end date', async () => {
+    await withCampaignService(async () => ({ rows: [] }), async ({ getTopClientsForCampaign }, queries) => {
+        const result = await getTopClientsForCampaign({
+            days: '30',
+            end: '2026-07-27'
+        });
+
+        assert.equal(result.start, '2026-06-28');
+        assert.equal(result.end, '2026-07-27');
+        assert.equal(result.limit, 1000);
+        assert.deepEqual(queries[0].params, ['2026-06-28', '2026-07-27', 1000]);
+    });
+});