feat: enable custom baseline periods for Experiments to solve seasonality

test-calc-2.js

@@ -0,0 +1,106 @@
+// Script to deeply test the calculation logic
+import fs from 'fs';
+
+const mockExperiment = {
+    id: 'test-1',
+    name: 'Test Exp',
+    type: 'advertising',
+    status: 'active',
+    start_date: '2026-01-01',
+    end_date: '2026-01-14',
+    asins: ['LINE:HAIRCARE'],
+    primary_metric: 'revenue'
+};
+
+const mockSalesData = [
+    // Before experiment (Baseline)
+    { year: 2025, week: 52, asin: 'ASIN1', line: 'HAIRCARE', salesTotal: 500, unitsTotal: 50, cost: 50, glanceViews: 100 },
+    { year: 2025, week: 52, asin: 'ASIN2', line: 'HAIRCARE', salesTotal: 200, unitsTotal: 20, cost: 20, glanceViews: 50 },
+
+    // During experiment 
+    { year: 2026, week: 1, asin: 'ASIN1', line: 'HAIRCARE', salesTotal: 1000, unitsTotal: 100, cost: 100, glanceViews: 200 },
+    { year: 2026, week: 2, asin: 'ASIN2', line: 'HAIRCARE', salesTotal: 400, unitsTotal: 40, cost: 40, glanceViews: 100 },
+
+    // Outside date range
+    { year: 2026, week: 3, asin: 'ASIN1', line: 'HAIRCARE', salesTotal: 100, unitsTotal: 10, cost: 10, glanceViews: 20 },
+
+    // Different product line
+    { year: 2026, week: 1, asin: 'ASIN3', line: 'SKINCARE', salesTotal: 1000, unitsTotal: 100, cost: 100, glanceViews: 200 }
+];
+
+const getExperimentAsins = (experimentAsins, salesData) => {
+    const explicitAsins = new Set();
+    const lines = new Set();
+
+    (experimentAsins || []).forEach(a => {
+        const val = (a || '').trim().toUpperCase();
+        if (val.startsWith('LINE:')) {
+            lines.add(val.substring(5).trim());
+        } else if (val) {
+            explicitAsins.add(val);
+        }
+    });
+
+    const asinSet = new Set(explicitAsins);
+    if (lines.size > 0 && salesData) {
+        salesData.forEach(r => {
+            const line = (r.line || '').trim().toUpperCase();
+            if (line && lines.has(line)) {
+                if (r.asin) asinSet.add(r.asin.toUpperCase());
+            }
+        });
+    }
+
+    return asinSet;
+};
+
+const parseLocalDate = (dateStr) => {
+    if (!dateStr) return new Date();
+    const [y, m, d] = dateStr.split('T')[0].split('-');
+    return new Date(Number(y), Number(m) - 1, Number(d));
+};
+
+
+const calculate = (experiment, salesData) => {
+    const startDate = parseLocalDate(experiment.start_date);
+    const endDate = experiment.end_date ? parseLocalDate(experiment.end_date) : new Date();
+
+    console.log('Parsed start date:', startDate);
+    console.log('Parsed end date:', endDate);
+
+    const durationMs = endDate.getTime() - startDate.getTime();
+    const baselineStart = new Date(startDate.getTime() - durationMs);
+    const baselineEnd = startDate;
+
+    console.log('Parsed baseline start:', baselineStart);
+    console.log('Parsed baseline end:', baselineEnd);
+
+    const asinSet = getExperimentAsins(experiment.asins, salesData);
+    console.log('Resolved ASINs:', Array.from(asinSet));
+
+    const baselineData = salesData.filter(r => {
+        const recordDate = new Date(r.year, 0, 1 + (r.week - 1) * 7);
+        const inRange = recordDate >= baselineStart && recordDate < baselineEnd;
+        const isAsin = asinSet.has(r.asin.toUpperCase());
+        if (isAsin) console.log(`[Baseline] Week ${r.year}-${r.week} date: ${recordDate} (inRange: ${inRange})`);
+        return isAsin && inRange;
+    });
+
+    const experimentData = salesData.filter(r => {
+        const recordDate = new Date(r.year, 0, 1 + (r.week - 1) * 7);
+        const inRange = recordDate >= startDate && recordDate <= endDate;
+        const isAsin = asinSet.has(r.asin.toUpperCase());
+        if (isAsin) console.log(`[Experiment] Week ${r.year}-${r.week} date: ${recordDate} (inRange: ${inRange})`);
+        return isAsin && inRange;
+    });
+
+    console.log('Baseline records matched:', baselineData.length);
+    console.log('Experiment records matched:', experimentData.length);
+
+    const baseline_units = baselineData.reduce((sum, r) => sum + r.unitsTotal, 0);
+    const experiment_units = experimentData.reduce((sum, r) => sum + r.unitsTotal, 0);
+
+    console.log('Units baseline:', baseline_units, 'Units experiment:', experiment_units);
+};
+
+calculate(mockExperiment, mockSalesData);