Optimize performance (persistent tabs, pagination) and add sortable columns + stock badges to ForecastView

components/ForecastView.tsx

@@ -96,6 +96,10 @@ const ForecastRow: React.FC<{
                         <span className="px-2 py-0.5 rounded bg-purple-500/10 text-[9px] font-black text-purple-300 uppercase tracking-widest border border-purple-500/20">
                             {item.line}
                         </span>
+                        {/* Own Stock Indicator */}
+                        {stockMap && (
+                            <StockBadge stock={stockMap.get(item.sku?.replace(/(DE|EN)$/i, ''))} />
+                        )}
                         {/* WOC Indicator preserved */}
                         <VendorStockBadge asin={item.asin} vendorStockMap={vendorStockMap} mode={top50Mode} avgWeeklySales={item.avgWeeklySales} />
                     </div>
@@ -161,30 +165,26 @@ const ForecastView: React.FC<ForecastViewProps> = ({
     top50Mode
 }) => {
     const [searchTerm, setSearchTerm] = useState('');
+    const debouncedSearch = useMemo(() => searchTerm.toLowerCase(), [searchTerm]);
     const [showOnlyTop50, setShowOnlyTop50] = useState(false);
     const [displayCount, setDisplayCount] = useState(50);
-
-    const lastDataMonthIdx = useMemo(() => {
-        let maxDataMonth = 0;
-        for (let i = MONTH_ORDER.length - 1; i >= 0; i--) {
-            if (data.some(p => (p.monthlyData?.[MONTH_ORDER[i]]?.actualUnits || 0) > 0)) {
-                maxDataMonth = i;
-                break;
-            }
-        }
-        const currentMonth = new Date().getMonth(); // 0 for Jan
-        return Math.min(maxDataMonth, currentMonth);
-    }, [data]);
+    const [sortConfig, setSortConfig] = useState<{ key: string; direction: 'asc' | 'desc' }>({ key: 'actualUnits', direction: 'desc' });
 
     const activeMonths = useMemo(() => {
         if (filters.month && filters.month.length > 0) {
             return filters.month.map(m => m.split('-')[0]);
         }
-        // Default to YTD: Current month and all before it this year
         const currentMonthIdx = new Date().getMonth();
         return MONTH_ORDER.slice(0, currentMonthIdx + 1);
     }, [filters.month]);
 
+    const handleSort = (key: string) => {
+        setSortConfig(prev => ({
+            key,
+            direction: prev.key === key && prev.direction === 'desc' ? 'asc' : 'desc'
+        }));
+    };
+
     const baseFilteredData = useMemo(() => {
         let result = data;
         if (filters.line && filters.line.length > 0) result = result.filter(p => filters.line.includes(p.line));
@@ -225,34 +225,75 @@ const ForecastView: React.FC<ForecastViewProps> = ({
         return Array.from(dataMap.values());
     }, [baseFilteredData]);
 
-    const finalFilteredData = useMemo(() => {
-        let result = baseFilteredData;
+    const processedData = useMemo(() => {
+        let result = baseFilteredData.map(item => {
+            const forecastPeriod = activeMonths.reduce((sum, month) => {
+                return sum + (item.monthlyData?.[month]?.forecastUnits || 0);
+            }, 0);
+            const ytdAchievement = forecastPeriod > 0 ? ((item.actualUnits || 0) / forecastPeriod) * 100 : 0;
+            const fcAchievement = (item.annualForecast || 0) > 0 ? ((item.actualUnits || 0) / item.annualForecast) * 100 : 0;
+
+            return {
+                ...item,
+                forecastPeriod,
+                ytdAchievement,
+                fcAchievement
+            };
+        });
+
         if (showOnlyTop50 && top50Ranking) {
             const currentRankMap = top50Mode === 'eu' ? top50Ranking.eu : top50Ranking.uk;
             result = result.filter(p => currentRankMap.has(p.asin.toUpperCase()));
         }
-        if (searchTerm) {
-            const s = searchTerm.toLowerCase();
-            result = result.filter(p => p.sku.toLowerCase().includes(s) || p.asin.toLowerCase().includes(s) || p.title.toLowerCase().includes(s));
+
+        if (debouncedSearch) {
+            result = result.filter(p =>
+                p.sku.toLowerCase().includes(debouncedSearch) ||
+                p.asin.toLowerCase().includes(debouncedSearch) ||
+                p.title.toLowerCase().includes(debouncedSearch)
+            );
         }
+
+        // Apply Sorting
+        const { key, direction } = sortConfig;
+        result.sort((a: any, b: any) => {
+            let valA = a[key];
+            let valB = b[key];
+
+            if (typeof valA === 'string') valA = valA.toLowerCase();
+            if (typeof valB === 'string') valB = valB.toLowerCase();
+
+            if (valA < valB) return direction === 'asc' ? -1 : 1;
+            if (valA > valB) return direction === 'asc' ? 1 : -1;
+            return 0;
+        });
+
         return result;
-    }, [baseFilteredData, searchTerm, showOnlyTop50, top50Ranking, top50Mode]);
+    }, [baseFilteredData, debouncedSearch, showOnlyTop50, top50Ranking, top50Mode, sortConfig, activeMonths]);
+
+    const paginatedData = useMemo(() => processedData.slice(0, displayCount), [processedData, displayCount]);
 
     const handleExportExcel = useCallback(() => {
-        const exportData = finalFilteredData.map(p => ({
+        const exportData = processedData.map(p => ({
             SKU: p.sku,
             ASIN: p.asin,
             Title: p.title,
             Line: p.line,
-            'Actual Units (2025)': p.actualUnits,
-            'Forecast Units (2025)': p.forecastUnits,
-            'Accuracy (%)': p.accuracy
+            'Forecast (Period)': p.forecastPeriod,
+            'Actual Units (2026)': p.actualUnits,
+            'FC 26 Achievement (%)': p.fcAchievement,
+            'YTD Achievement (%)': p.ytdAchievement
         }));
         const ws = XLSX.utils.json_to_sheet(exportData);
         const wb = XLSX.utils.book_new();
         XLSX.utils.book_append_sheet(wb, ws, 'Forecast');
         XLSX.writeFile(wb, `Forecast_Export_${new Date().toISOString().slice(0, 10)}.xlsx`);
-    }, [finalFilteredData]);
+    }, [processedData]);
+
+    const SortIndicator = ({ column }: { column: string }) => {
+        if (sortConfig.key !== column) return <span className="ml-1 opacity-20">↕</span>;
+        return <span className="ml-1 text-indigo-400">{sortConfig.direction === 'desc' ? '↓' : '↑'}</span>;
+    };
 
     return (
         <div className="flex flex-col gap-6 animate-fade-in p-6 h-full overflow-hidden">
@@ -318,12 +359,13 @@ const ForecastView: React.FC<ForecastViewProps> = ({
                 </div>
             </div>
 
-            <div className="bg-slate-900 border border-white/10 rounded-2xl overflow-hidden shadow-2xl flex-1 flex flex-col min-h-0">
+            <div className="bg-slate-900 border border-white/10 rounded-2xl overflow-hidden shadow-2xl flex-1 flex flex-col min-h-0 relative">
                 <div className="p-4 border-b border-white/5 flex flex-col md:flex-row justify-between gap-4 bg-slate-800/20 shrink-0">
                     <h3 className="text-lg font-bold text-white uppercase tracking-tight">
-                        Product Performance Comparison <span className="text-xs text-slate-500 font-normal normal-case ml-2">(v2.4 Final)</span>
+                        Product Performance Comparison <span className="text-xs text-slate-500 font-normal normal-case ml-2">(v2.5 optimized)</span>
                     </h3>
                     <div className="flex items-center gap-4">
+                        <div className="text-[10px] font-bold text-slate-500 uppercase">Showing {paginatedData.length} of {processedData.length}</div>
                         {top50Ranking && (top50Ranking.eu.size > 0 || top50Ranking.uk.size > 0) && (
                             <div className="flex bg-slate-950/50 p-1 rounded-xl border border-white/10 shadow-sm">
                                 <button
@@ -348,17 +390,27 @@ const ForecastView: React.FC<ForecastViewProps> = ({
 
                 <div className="flex-1 overflow-auto min-h-0 custom-scrollbar relative">
                     <table className="w-full text-left border-collapse relative">
-                        <thead className="sticky top-0 z-20 bg-slate-950 shadow-sm text-xs font-bold text-slate-400 uppercase tracking-wider">
+                        <thead className="sticky top-0 z-20 bg-slate-950 shadow-sm text-[10px] font-black text-slate-500 uppercase tracking-wider">
                             <tr>
-                                <th className="px-6 py-4 font-black text-white w-[35%]">Product Info</th>
-                                <th className="px-6 py-4 text-center w-[12%]">Forecast (Period)</th>
-                                <th className="px-6 py-4 text-center w-[12%]">Actual Units Sales 2026</th>
-                                <th className="px-6 py-4 text-center w-[15%]">FC 26 Achievement</th>
-                                <th className="px-6 py-4 text-center w-[26%]">YTD Achievement</th>
+                                <th className="px-6 py-4 text-white w-[35%] cursor-pointer hover:bg-white/5 transition-colors" onClick={() => handleSort('sku')}>
+                                    Product Info <SortIndicator column="sku" />
+                                </th>
+                                <th className="px-6 py-4 text-center w-[12%] cursor-pointer hover:bg-white/5 transition-colors" onClick={() => handleSort('forecastPeriod')}>
+                                    Forecast (Period) <SortIndicator column="forecastPeriod" />
+                                </th>
+                                <th className="px-6 py-4 text-center w-[12%] cursor-pointer hover:bg-white/5 transition-colors" onClick={() => handleSort('actualUnits')}>
+                                    Actual Units 2026 <SortIndicator column="actualUnits" />
+                                </th>
+                                <th className="px-6 py-4 text-center w-[15%] cursor-pointer hover:bg-white/5 transition-colors" onClick={() => handleSort('fcAchievement')}>
+                                    FC 26 Achievement <SortIndicator column="fcAchievement" />
+                                </th>
+                                <th className="px-6 py-4 text-center w-[26%] cursor-pointer hover:bg-white/5 transition-colors" onClick={() => handleSort('ytdAchievement')}>
+                                    YTD Achievement <SortIndicator column="ytdAchievement" />
+                                </th>
                             </tr>
                         </thead>
                         <tbody className="divide-y divide-slate-800/50">
-                            {finalFilteredData.map(item => (
+                            {paginatedData.map(item => (
                                 <ForecastRow
                                     key={item.asin}
                                     item={item}
@@ -372,7 +424,18 @@ const ForecastView: React.FC<ForecastViewProps> = ({
                         </tbody>
                     </table>
 
-                    {finalFilteredData.length === 0 && (
+                    {displayCount < processedData.length && (
+                        <div className="p-8 flex justify-center">
+                            <button
+                                onClick={() => setDisplayCount(prev => prev + 50)}
+                                className="px-8 py-3 bg-indigo-500 hover:bg-indigo-600 text-white text-sm font-black uppercase tracking-widest rounded-xl shadow-lg transition-all active:scale-95"
+                            >
+                                Load More Products
+                            </button>
+                        </div>
+                    )}
+
+                    {processedData.length === 0 && (
                         <div className="flex flex-col items-center justify-center py-20 text-slate-500">
                             <p className="text-lg">No forecast data found for current filters</p>
                         </div>