fix: resolve vendor data upload error by implementing client-side parsing and sequential batching

services/dataProcessor.ts

@@ -1,7 +1,57 @@
-import { SalesRecord, AdsRecord, TrafficRecord, CombinedKPIs, FilterState, AggregatedData, LineGrowthMetric, ItemGrowthMetric, SeasonalityPoint, YearlySplitData, PivotRow, YearlyData, TimeSeriesData, ComparisonTimeSeriesPoint, ForecastRecord, MonthlyForecastPoint, ProductForecastData } from '../types';
+import { SalesRecord, AdsRecord, TrafficRecord, CombinedKPIs, FilterState, AggregatedData, LineGrowthMetric, ItemGrowthMetric, SeasonalityPoint, YearlySplitData, PivotRow, YearlyData, TimeSeriesData, ComparisonTimeSeriesPoint, ForecastRecord, MonthlyForecastPoint, ProductForecastData, VendorCSVRow, VendorDailyRow } from '../types';
 import * as XLSX from 'xlsx';
 import Papa from 'papaparse';
 
+/**
+ * Parses Vendor CSV and returns mapped VendorDailyRow items.
+ */
+export const processVendorCSV = (fileOrContent: File | string): Promise<VendorDailyRow[]> => {
+    return new Promise((resolve, reject) => {
+        const config = {
+            header: true,
+            skipEmptyLines: true,
+            complete: (results: any) => {
+                const rows = results.data
+                    .filter((row: any) => row['Date'] && row['Market'] && row['ASIN'])
+                    .map((row: any) => ({
+                        date: row['Date'],
+                        market: row['Market'],
+                        asin: row['ASIN'],
+                        product_title: row['Product Title'] || null,
+                        tags: row['Tags'] || null,
+                        bsr_top_rank: parseIntSafe(row['Top Level Category (Rank)']),
+                        bsr_top_category: row['Top Level Category (Name)'] || null,
+                        bsr_detail_rank: parseIntSafe(row['Detail Level Category (Rank)']),
+                        bsr_detail_category: row['Detail Level Category (Name)'] || null,
+                        avg_rating: parseCurrency(row['Average Rating']), // Uses existing parseCurrency which handles EU/US
+                        num_reviews: parseIntSafe(row['Number of Reviews']),
+                        buybox_owner: row['Buybox Seller Name'] || null,
+                        buybox_price: parseCurrency(row['Buybox Price']),
+                        amazon_has_buybox: row['Amazon Has Buybox'] === '1',
+                        glance_views: parseIntSafe(row['Glance Views']),
+                    }));
+                resolve(rows);
+            },
+            error: (error: any) => {
+                reject(error);
+            }
+        };
+
+        if (typeof fileOrContent === 'string') {
+            Papa.parse(fileOrContent, config);
+        } else {
+            Papa.parse(fileOrContent, config);
+        }
+    });
+};
+
+function parseIntSafe(val: string | undefined | null): number | null {
+    if (!val || typeof val !== 'string' || val.trim() === '') return null;
+    const cleaned = val.replace(/\./g, '').replace(',', '.').replace(/[^0-9.]/g, '');
+    const num = parseInt(cleaned, 10);
+    return isNaN(num) ? null : num;
+}
+
 // Helper to parse currency values handling both EU (1.234,56) and US/Standard (1,234.56 or 1234.56) formats
 const parseCurrency = (value: string): number => {
     if (!value) return 0;