feat: add Top 50 filter and sorting to Forecast View

components/ForecastView.tsx

@@ -1,5 +1,5 @@
 
-import React, { useMemo, useState } from 'react';
+import React, { useMemo, useState, useEffect } from 'react';
 import { ProductForecastData, FilterState } from '../types';
 import {
     BarChart, Bar, XAxis, YAxis, CartesianGrid, Tooltip, ResponsiveContainer,
@@ -30,6 +30,17 @@ const Top50Badge: React.FC<{ rank: number; label: string; theme?: 'amber' | 'ind
 
 const ForecastView: React.FC<ForecastViewProps> = ({ data, filters, top50Ranking }) => {
     const [searchTerm, setSearchTerm] = useState('');
+    const [showOnlyTop50, setShowOnlyTop50] = useState(false);
+    const [top50Mode, setTop50Mode] = useState<'eu' | 'uk'>('eu');
+
+    // Auto-detect best Top 50 mode based on data
+    useEffect(() => {
+        const hasUK = data.some(p => p.line.toLowerCase().includes('uk') || (p.monthlyData && p.actualUnits > 0 && filters.customer.some(c => c.toLowerCase().includes('uk'))));
+        const hasEU = data.some(p => !p.line.toLowerCase().includes('uk'));
+
+        // Simplified detection: if we have a lot of EU products, default EU, otherwise check UK
+        if (hasUK && !hasEU) setTop50Mode('uk');
+    }, [data, filters.customer]);
 
     // Determine the "Current Month" based on available 2026 data
     const lastDataMonthIdx = useMemo(() => {
@@ -84,18 +95,41 @@ const ForecastView: React.FC<ForecastViewProps> = ({ data, filters, top50Ranking
     }, [data]);
 
     const filteredProducts = useMemo(() => {
-        if (!searchTerm) return data;
-        const s = searchTerm.toLowerCase();
-        return data.filter(p =>
-            p.asin.toLowerCase().includes(s) ||
-            p.sku.toLowerCase().includes(s) ||
-            p.title.toLowerCase().includes(s)
-        );
-    }, [data, searchTerm]);
+        let result = data;
+
+        if (searchTerm) {
+            const s = searchTerm.toLowerCase();
+            result = result.filter(p =>
+                p.asin.toLowerCase().includes(s) ||
+                p.sku.toLowerCase().includes(s) ||
+                p.title.toLowerCase().includes(s)
+            );
+        }
+
+        if (showOnlyTop50 && top50Ranking) {
+            const currentRankMap = top50Mode === 'eu' ? top50Ranking.eu : top50Ranking.uk;
+            result = result.filter(p => currentRankMap.has(p.asin.toUpperCase()));
+        }
+
+        return result;
+    }, [data, searchTerm, showOnlyTop50, top50Mode, top50Ranking]);
 
     const sortedProducts = useMemo(() => {
-        return [...filteredProducts].sort((a, b) => b.annualForecast - a.annualForecast);
-    }, [filteredProducts]);
+        const result = [...filteredProducts];
+
+        if (showOnlyTop50 && top50Ranking) {
+            const currentRankMap = top50Mode === 'eu' ? top50Ranking.eu : top50Ranking.uk;
+            result.sort((a, b) => {
+                const rankA = currentRankMap.get(a.asin.toUpperCase()) || 999;
+                const rankB = currentRankMap.get(b.asin.toUpperCase()) || 999;
+                return rankA - rankB;
+            });
+        } else {
+            result.sort((a, b) => b.annualForecast - a.annualForecast);
+        }
+
+        return result;
+    }, [filteredProducts, showOnlyTop50, top50Mode, top50Ranking]);
 
     return (
         <div className="p-6 space-y-6 max-w-7xl mx-auto animate-fade-in pb-24">
@@ -167,15 +201,43 @@ const ForecastView: React.FC<ForecastViewProps> = ({ data, filters, top50Ranking
             <div className="bg-slate-900 border border-border rounded-2xl shadow-xl overflow-hidden">
                 <div className="p-6 border-b border-border flex flex-col md:flex-row justify-between gap-4">
                     <h3 className="text-lg font-bold text-white uppercase tracking-tight">Product Performance Comparison</h3>
-                    <div className="relative">
-                        <input
-                            type="text"
-                            placeholder="Search by ASIN, SKU or Title..."
-                            value={searchTerm}
-                            onChange={(e) => setSearchTerm(e.target.value)}
-                            className="bg-slate-950 border border-slate-700 rounded-lg px-10 py-2 text-sm text-slate-200 focus:outline-none focus:border-indigo-500 w-full md:w-80"
-                        />
-                        <svg className="absolute left-3 top-2.5 w-4 h-4 text-slate-500" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" /></svg>
+                    <div className="flex flex-col md:flex-row items-center gap-4">
+                        {/* Top 50 Toggle */}
+                        <div className="flex items-center bg-slate-950 p-1 rounded-lg border border-slate-700">
+                            <button
+                                onClick={() => setShowOnlyTop50(!showOnlyTop50)}
+                                className={`px-3 py-1.5 rounded-md text-xs font-black transition-all flex items-center gap-2 ${showOnlyTop50 ? 'bg-indigo-600 text-white shadow-lg shadow-indigo-500/20' : 'text-slate-500 hover:text-slate-300'}`}
+                            >
+                                <span className="text-sm">🏆</span>
+                                Top 50
+                            </button>
+                            {showOnlyTop50 && (
+                                <div className="flex items-center ml-1 border-l border-slate-700 pl-1">
+                                    <button
+                                        onClick={() => setTop50Mode('eu')}
+                                        className={`px-2 py-1 rounded text-[10px] font-bold transition-colors ${top50Mode === 'eu' ? 'text-indigo-400 bg-indigo-500/10' : 'text-slate-600 hover:text-slate-400'}`}
+                                    >
+                                        EU
+                                    </button>
+                                    <button
+                                        onClick={() => setTop50Mode('uk')}
+                                        className={`px-2 py-1 rounded text-[10px] font-bold transition-colors ${top50Mode === 'uk' ? 'text-indigo-400 bg-indigo-500/10' : 'text-slate-600 hover:text-slate-400'}`}
+                                    >
+                                        UK
+                                    </button>
+                                </div>
+                            )}
+                        </div>
+                        <div className="relative">
+                            <input
+                                type="text"
+                                placeholder="Search by ASIN, SKU or Title..."
+                                value={searchTerm}
+                                onChange={(e) => setSearchTerm(e.target.value)}
+                                className="bg-slate-950 border border-slate-700 rounded-lg px-10 py-2 text-sm text-slate-200 focus:outline-none focus:border-indigo-500 w-full md:w-80"
+                            />
+                            <svg className="absolute left-3 top-2.5 w-4 h-4 text-slate-500" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" /></svg>
+                        </div>
                     </div>
                 </div>
                 <div className="overflow-x-auto">