Implement Weeks of Coverage indicator for Vendor Stock

services/dataProcessor.ts

@@ -598,10 +598,35 @@ export const mergeSalesAndAdsData = (
         }
     }
 
+    // 4. Calculate 4-Week Average Sales per ASIN
+    const latestYear = Math.max(...salesData.map(r => r.year).filter(y => y > 0));
+    const yearData = salesData.filter(r => r.year === latestYear);
+    const latestWeek = yearData.length > 0 ? Math.max(...yearData.map(r => r.week).filter(w => w !== undefined) as number[]) : 0;
+
+    const last4WeeksKeys = new Set<string>();
+    for (let i = 0; i < 4; i++) {
+        let w = latestWeek - i;
+        let y = latestYear;
+        if (w <= 0) {
+            w = 52 + w;
+            y = latestYear - 1;
+        }
+        last4WeeksKeys.add(`${y}|${w}`);
+    }
+
+    const asin4WeekSales = new Map<string, number>();
+    salesData.forEach(r => {
+        if (r.week === undefined) return;
+        if (last4WeeksKeys.has(`${r.year}|${r.week}`)) {
+            const key = r.asin.trim().toUpperCase();
+            asin4WeekSales.set(key, (asin4WeekSales.get(key) || 0) + r.units);
+        }
+    });
+
     const mergedData: CombinedKPIs[] = [];
     const processedKeys = new Set<string>();
 
-    // 4. Create ONE record per ASIN/Customer/Year/Week from sales
+    // 5. Create ONE record per ASIN/Customer/Year/Week from sales
     salesMap.forEach((sale, key) => {
         processedKeys.add(key);
         const ad = adsMap.get(key);
@@ -623,6 +648,7 @@ export const mergeSalesAndAdsData = (
         const ctr = adImpressions > 0 ? (adClicks / adImpressions) * 100 : 0;
         const cpc = adClicks > 0 ? adCost / adClicks : 0;
         const cvrUnits = adClicks > 0 ? (adUnits / adClicks) * 100 : 0;
+        const avgWeeklySales = (asin4WeekSales.get(sale.asin.trim().toUpperCase()) || 0) / 4;
 
         mergedData.push({
             id: `merged-${key}`,
@@ -653,7 +679,8 @@ export const mergeSalesAndAdsData = (
             ctr,
             cpc,
             cvrUnits,
-            glanceViews: trafficMap.get(key) || 0
+            glanceViews: trafficMap.get(key) || 0,
+            avgWeeklySales
         });
     });
 
@@ -662,6 +689,7 @@ export const mergeSalesAndAdsData = (
         if (!processedKeys.has(key)) {
             const asin = ad.asin.trim().toUpperCase();
             const meta = asinMetadata.get(asin);
+            const avgWeeklySales = (asin4WeekSales.get(asin) || 0) / 4;
 
             mergedData.push({
                 id: `ads-only-${key}`,
@@ -692,7 +720,8 @@ export const mergeSalesAndAdsData = (
                 ctr: ad.impressions > 0 ? (ad.clicks / ad.impressions) * 100 : 0,
                 cpc: ad.clicks > 0 ? ad.cost / ad.clicks : 0,
                 cvrUnits: ad.clicks > 0 ? (ad.attributedUnits30d / ad.clicks) * 100 : 0,
-                glanceViews: trafficMap.get(key) || 0
+                glanceViews: trafficMap.get(key) || 0,
+                avgWeeklySales
             });
         }
     });
@@ -1684,9 +1713,35 @@ export const calculateForecastViewData = (
         monthMap.set(m, (monthMap.get(m) || 0) + r.units);
     });
 
+    // 4-Week Average Sales Calculation
+    const latestYear = Math.max(...rawData.map(r => r.year).filter(y => y > 0));
+    const yearData = rawData.filter(r => r.year === latestYear);
+    const latestWeek = yearData.length > 0 ? Math.max(...yearData.map(r => r.week).filter(w => w !== undefined) as number[]) : 0;
+
+    const last4WeeksKeys = new Set<string>();
+    for (let i = 0; i < 4; i++) {
+        let w = latestWeek - i;
+        let y = latestYear;
+        if (w <= 0) {
+            w = 52 + w;
+            y = latestYear - 1;
+        }
+        last4WeeksKeys.add(`${y}|${w}`);
+    }
+
+    const asin4WeekSales = new Map<string, number>();
+    rawData.forEach(r => {
+        if (r.week === undefined) return;
+        if (last4WeeksKeys.has(`${r.year}|${r.week}`)) {
+            const key = r.asin.trim().toUpperCase();
+            asin4WeekSales.set(key, (asin4WeekSales.get(key) || 0) + r.units);
+        }
+    });
+
     return forecastData.map(fc => {
         const identifier = fc.asin.toUpperCase();
         const meta = asinMetadata.get(identifier);
+        const avgWeeklySales = (asin4WeekSales.get(identifier) || 0) / 4;
 
         // 2. Determine weights for this ASIN
         const productRecords2025 = dataByAsin2025.get(identifier) || [];
@@ -1735,6 +1790,7 @@ export const calculateForecastViewData = (
             actualUnits: totalActualUnits,
             forecastUnits: totalForecastUnits,
             accuracy: Math.max(0, accuracy),
+            avgWeeklySales,
             monthlyData
         };
     });