feat: replace Vendor tab with BSR tracker

services/dataProcessor.ts

@@ -1,4 +1,4 @@
-import { SalesRecord, AdsRecord, TrafficRecord, CombinedKPIs, FilterState, AggregatedData, LineGrowthMetric, ItemGrowthMetric, SeasonalityPoint, YearlySplitData, PivotRow, YearlyData, TimeSeriesData, ComparisonTimeSeriesPoint, ForecastRecord, MonthlyForecastPoint, ProductForecastData, VendorCSVRow, VendorDailyRow } from '../types';
+import { SalesRecord, AdsRecord, TrafficRecord, CombinedKPIs, FilterState, AggregatedData, LineGrowthMetric, ItemGrowthMetric, SeasonalityPoint, YearlySplitData, PivotRow, YearlyData, TimeSeriesData, ComparisonTimeSeriesPoint, ForecastRecord, MonthlyForecastPoint, ProductForecastData, VendorCSVRow, VendorDailyRow, BSRRecord } from '../types';
 import * as XLSX from 'xlsx';
 import Papa from 'papaparse';
 
@@ -657,6 +657,60 @@ export const processTrafficExcel = async (fileOrBuffer: File | ArrayBuffer): Pro
     }
 };
 
+// --- BSR DATA PARSING ---
+
+export const processBSRExcel = async (fileOrBuffer: File | ArrayBuffer): Promise<BSRRecord[]> => {
+    try {
+        const arrayBuffer = fileOrBuffer instanceof File
+            ? await fileOrBuffer.arrayBuffer()
+            : fileOrBuffer;
+        const workbook = XLSX.read(arrayBuffer, { type: 'array' });
+        const allData: BSRRecord[] = [];
+
+        // Typically BSR is in the first sheet
+        const sheetName = workbook.SheetNames[0];
+        const worksheet = workbook.Sheets[sheetName];
+        const jsonData: any[] = XLSX.utils.sheet_to_json(worksheet, { defval: "" });
+
+        console.log(`Processing BSR sheet "${sheetName}": ${jsonData.length} rows`);
+
+        for (let i = 0; i < jsonData.length; i++) {
+            const row = jsonData[i];
+
+            const weekRaw = getColumnValue(row, ['week', 'woche', 'semana']);
+            const marketRaw = getColumnValue(row, ['market', 'country', 'marketplace']);
+            const asinRaw = getColumnValue(row, ['asin']);
+            const topLevelBSRRaw = getColumnValue(row, ['Mean Weekly Top Level BSR']);
+            const topLevelNameRaw = getColumnValue(row, ['Top Level Category Name']);
+            const detailLevelBSRRaw = getColumnValue(row, ['Mean Weekly Detail Level BSR']);
+            const detailLevelNameRaw = getColumnValue(row, ['Detail Level Category Name']);
+            const avgRatingRaw = getColumnValue(row, ['Mean Weekly Average Rating']);
+
+            if (!weekRaw || !marketRaw || !asinRaw) continue;
+
+            const week = parseInt(String(weekRaw).match(/\\d+/)?.[0] || '0', 10);
+            if (isNaN(week) || week === 0) continue;
+
+            allData.push({
+                week,
+                market: String(marketRaw).trim(),
+                asin: String(asinRaw).trim(),
+                topLevelBSR: parseIntSafe(String(topLevelBSRRaw)),
+                topLevelName: topLevelNameRaw ? String(topLevelNameRaw).trim() : null,
+                detailLevelBSR: parseIntSafe(String(detailLevelBSRRaw)),
+                detailLevelName: detailLevelNameRaw ? String(detailLevelNameRaw).trim() : null,
+                avgRating: parseFloat(String(avgRatingRaw)) || null,
+            });
+        }
+
+        console.log(`Total BSR records loaded: ${allData.length}`);
+        return allData;
+    } catch (error) {
+        console.error("Error processing BSR Excel:", error);
+        throw error;
+    }
+};
+
 // --- DATA MERGING ---
 
 export const mergeSalesAndAdsData = (