Add profit analytics chart and service

Introduces a new ProfitAnalyticsChart component to display profit-related metrics, including total revenue, cost, profit, and top profitable products. Updates the AnalyticsDashboard to include a Profit tab and adds a profit-analytics-service for fetching profit data from the backend.

components/analytics/AnalyticsDashboard.tsx

@@ -17,7 +17,8 @@ import {
   Activity,
   RefreshCw,
   Eye,
-  EyeOff
+  EyeOff,
+  Calculator
 } from "lucide-react";
 import { useToast } from "@/hooks/use-toast";
 import MetricsCard from "./MetricsCard";
@@ -44,6 +45,10 @@ const OrderAnalyticsChart = dynamic(() => import('./OrderAnalyticsChart'), {
   loading: () => <ChartSkeleton />
 });
 
+const ProfitAnalyticsChart = dynamic(() => import('./ProfitAnalyticsChart'), {
+  loading: () => <ChartSkeleton />
+});
+
 // Chart loading skeleton
 function ChartSkeleton() {
   return (
@@ -249,7 +254,7 @@ export default function AnalyticsDashboard({ initialData }: AnalyticsDashboardPr
         <div>
           <h3 className="text-lg font-semibold">Time Period</h3>
           <p className="text-sm text-muted-foreground">
-            Revenue and Orders tabs use time filtering. Products and Customers show all-time data.
+            Revenue, Profit, and Orders tabs use time filtering. Products and Customers show all-time data.
           </p>
         </div>
         <Select value={timeRange} onValueChange={setTimeRange}>
@@ -267,11 +272,15 @@ export default function AnalyticsDashboard({ initialData }: AnalyticsDashboardPr
       {/* Analytics Tabs */}
       <div className="space-y-6">
         <Tabs defaultValue="revenue" className="space-y-6">
-          <TabsList className="grid w-full grid-cols-4">
+          <TabsList className="grid w-full grid-cols-5">
             <TabsTrigger value="revenue" className="flex items-center gap-2">
               <TrendingUp className="h-4 w-4" />
               Revenue
             </TabsTrigger>
+            <TabsTrigger value="profit" className="flex items-center gap-2">
+              <Calculator className="h-4 w-4" />
+              Profit
+            </TabsTrigger>
             <TabsTrigger value="products" className="flex items-center gap-2">
               <Package className="h-4 w-4" />
               Products
@@ -292,6 +301,12 @@ export default function AnalyticsDashboard({ initialData }: AnalyticsDashboardPr
             </Suspense>
           </TabsContent>
 
+          <TabsContent value="profit" className="space-y-6">
+            <Suspense fallback={<ChartSkeleton />}>
+              <ProfitAnalyticsChart timeRange={timeRange} hideNumbers={hideNumbers} />
+            </Suspense>
+          </TabsContent>
+
           <TabsContent value="products" className="space-y-6">
             <Suspense fallback={<ChartSkeleton />}>
               <ProductPerformanceChart />

components/analytics/ProfitAnalyticsChart.tsx

@@ -0,0 +1,270 @@
+"use client"
+
+import { useState, useEffect } from 'react';
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
+import { Badge } from "@/components/ui/badge";
+import { Alert, AlertDescription } from "@/components/ui/alert";
+import { 
+  TrendingUp, 
+  TrendingDown, 
+  DollarSign, 
+  PieChart,
+  Calculator,
+  Info,
+  AlertTriangle
+} from "lucide-react";
+import { useToast } from "@/hooks/use-toast";
+import { formatGBP } from "@/utils/format";
+import { getProfitOverview, type ProfitOverview } from "@/lib/services/profit-analytics-service";
+import { TableSkeleton } from './SkeletonLoaders';
+
+interface ProfitAnalyticsChartProps {
+  timeRange: string;
+  hideNumbers?: boolean;
+}
+
+export default function ProfitAnalyticsChart({ timeRange, hideNumbers = false }: ProfitAnalyticsChartProps) {
+  const [data, setData] = useState<ProfitOverview | null>(null);
+  const [isLoading, setIsLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+  const { toast } = useToast();
+
+  const maskValue = (value: string): string => {
+    if (!hideNumbers) return value;
+    if (value.includes('£')) return '£***';
+    if (value.match(/^\d/)) {
+      const numLength = value.replace(/[,\.%]/g, '').length;
+      return '*'.repeat(Math.min(numLength, 4));
+    }
+    return value;
+  };
+
+  useEffect(() => {
+    const fetchData = async () => {
+      try {
+        setIsLoading(true);
+        setError(null);
+        const response = await getProfitOverview(timeRange);
+        setData(response);
+      } catch (error) {
+        console.error('Error fetching profit data:', error);
+        setError('Failed to load profit analytics');
+        toast({
+          title: "Error",
+          description: "Failed to load profit analytics data.",
+          variant: "destructive",
+        });
+      } finally {
+        setIsLoading(false);
+      }
+    };
+
+    fetchData();
+  }, [timeRange, toast]);
+
+  if (isLoading) {
+    return <TableSkeleton />;
+  }
+
+  if (error || !data) {
+    return (
+      <Card>
+        <CardHeader>
+          <CardTitle className="flex items-center gap-2">
+            <Calculator className="h-5 w-5" />
+            Profit Analytics
+          </CardTitle>
+        </CardHeader>
+        <CardContent>
+          <div className="text-center py-8">
+            <AlertTriangle className="h-8 w-8 text-muted-foreground mx-auto mb-2" />
+            <p className="text-muted-foreground">Failed to load profit data</p>
+          </div>
+        </CardContent>
+      </Card>
+    );
+  }
+
+  if (!data.hasCostData) {
+    return (
+      <Card>
+        <CardHeader>
+          <CardTitle className="flex items-center gap-2">
+            <Calculator className="h-5 w-5" />
+            Profit Analytics
+          </CardTitle>
+          <CardDescription>
+            Track your actual profits based on sales and cost data
+          </CardDescription>
+        </CardHeader>
+        <CardContent>
+          <Alert>
+            <Info className="h-4 w-4" />
+            <AlertDescription>
+              <strong>No cost data available</strong><br />
+              Add cost prices to your products to see profit analytics. Go to Products → Edit → Cost & Profit Tracking section.
+            </AlertDescription>
+          </Alert>
+        </CardContent>
+      </Card>
+    );
+  }
+
+  const profitDirection = data.summary.totalProfit >= 0;
+
+  return (
+    <div className="space-y-6">
+      {/* Summary Cards */}
+      <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-4 gap-4">
+        <Card>
+          <CardHeader className="pb-2">
+            <CardTitle className="text-sm font-medium">Total Revenue</CardTitle>
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold text-green-600">
+              {maskValue(formatGBP(data.summary.totalRevenue))}
+            </div>
+            <p className="text-xs text-muted-foreground">
+              From {data.summary.totalProductsSold} items sold
+            </p>
+          </CardContent>
+        </Card>
+
+        <Card>
+          <CardHeader className="pb-2">
+            <CardTitle className="text-sm font-medium">Total Cost</CardTitle>
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold text-red-600">
+              {maskValue(formatGBP(data.summary.totalCost))}
+            </div>
+            <p className="text-xs text-muted-foreground">
+              From {data.summary.productsWithCostData} tracked items
+            </p>
+          </CardContent>
+        </Card>
+
+        <Card>
+          <CardHeader className="pb-2">
+            <CardTitle className="text-sm font-medium">Total Profit</CardTitle>
+          </CardHeader>
+          <CardContent>
+            <div className={`text-2xl font-bold flex items-center gap-2 ${
+              profitDirection ? 'text-green-600' : 'text-red-600'
+            }`}>
+              {profitDirection ? (
+                <TrendingUp className="h-5 w-5" />
+              ) : (
+                <TrendingDown className="h-5 w-5" />
+              )}
+              {maskValue(formatGBP(data.summary.totalProfit))}
+            </div>
+            <p className="text-xs text-muted-foreground">
+              {maskValue(`${data.summary.overallProfitMargin.toFixed(1)}%`)} margin
+            </p>
+          </CardContent>
+        </Card>
+
+        <Card>
+          <CardHeader className="pb-2">
+            <CardTitle className="text-sm font-medium">Avg Profit/Unit</CardTitle>
+          </CardHeader>
+          <CardContent>
+            <div className="text-2xl font-bold text-blue-600">
+              {maskValue(formatGBP(data.summary.averageProfitPerUnit))}
+            </div>
+            <p className="text-xs text-muted-foreground">
+              Per unit sold
+            </p>
+          </CardContent>
+        </Card>
+      </div>
+
+      {/* Cost Data Coverage */}
+      <Card>
+        <CardHeader>
+          <CardTitle className="flex items-center gap-2">
+            <PieChart className="h-5 w-5" />
+            Cost Data Coverage
+          </CardTitle>
+          <CardDescription>
+            Percentage of sold items that have cost data for profit calculation
+          </CardDescription>
+        </CardHeader>
+        <CardContent>
+          <div className="flex items-center gap-4">
+            <div className="text-3xl font-bold">
+              {hideNumbers ? "**%" : `${data.summary.costDataCoverage.toFixed(1)}%`}
+            </div>
+            <div className="flex-1">
+              <div className="w-full bg-secondary rounded-full h-2">
+                <div 
+                  className="bg-primary h-2 rounded-full transition-all duration-300"
+                  style={{ width: hideNumbers ? "0%" : `${data.summary.costDataCoverage}%` }}
+                />
+              </div>
+            </div>
+            <Badge variant="secondary">
+              {hideNumbers ? "** / **" : `${data.summary.productsWithCostData} / ${data.summary.totalProductsSold}`}
+            </Badge>
+          </div>
+        </CardContent>
+      </Card>
+
+      {/* Top Profitable Products */}
+      <Card>
+        <CardHeader>
+          <CardTitle className="flex items-center gap-2">
+            <DollarSign className="h-5 w-5" />
+            Most Profitable Products
+          </CardTitle>
+          <CardDescription>
+            Products generating the highest total profit (last {timeRange} days)
+          </CardDescription>
+        </CardHeader>
+        <CardContent>
+          {data.topProfitableProducts.length === 0 ? (
+            <div className="text-center py-8">
+              <Calculator className="h-8 w-8 text-muted-foreground mx-auto mb-2" />
+              <p className="text-muted-foreground">No profitable products data available</p>
+            </div>
+          ) : (
+            <div className="space-y-4">
+              {data.topProfitableProducts.map((product, index) => {
+                const profitPositive = product.totalProfit >= 0;
+                
+                return (
+                  <div
+                    key={product.productId}
+                    className="flex items-center justify-between p-4 border rounded-lg"
+                  >
+                    <div className="flex items-center gap-3">
+                      <div className="flex items-center justify-center w-8 h-8 rounded-full bg-primary/10 text-primary font-semibold text-sm">
+                        {index + 1}
+                      </div>
+                      <div>
+                        <p className="font-medium">{product.productName}</p>
+                        <p className="text-sm text-muted-foreground">
+                          {product.totalQuantitySold} units sold
+                        </p>
+                      </div>
+                    </div>
+                    
+                    <div className="text-right">
+                      <div className={`font-medium ${profitPositive ? 'text-green-600' : 'text-red-600'}`}>
+                        {maskValue(formatGBP(product.totalProfit))}
+                      </div>
+                      <div className="text-sm text-muted-foreground">
+                        {maskValue(`${product.profitMargin.toFixed(1)}%`)} margin
+                      </div>
+                    </div>
+                  </div>
+                );
+              })}
+            </div>
+          )}
+        </CardContent>
+      </Card>
+    </div>
+  );
+}

lib/services/profit-analytics-service.ts

@@ -0,0 +1,48 @@
+import { apiRequest } from '../api';
+
+export interface ProfitOverview {
+  period: string;
+  summary: {
+    totalRevenue: number;
+    totalCost: number;
+    totalProfit: number;
+    overallProfitMargin: number;
+    averageProfitPerUnit: number;
+    costDataCoverage: number;
+    totalProductsSold: number;
+    productsWithCostData: number;
+  };
+  topProfitableProducts: Array<{
+    productId: string;
+    productName: string;
+    totalQuantitySold: number;
+    totalRevenue: number;
+    totalCost: number;
+    totalProfit: number;
+    averageProfit: number;
+    profitMargin: number;
+  }>;
+  hasCostData: boolean;
+}
+
+export interface ProfitTrend {
+  _id: {
+    year: number;
+    month: number;
+    day: number;
+  };
+  revenue: number;
+  cost: number;
+  profit: number;
+  orders: number;
+  itemsWithCostData: number;
+  profitMargin: number;
+}
+
+export const getProfitOverview = async (period: string = '30'): Promise<ProfitOverview> => {
+  return apiRequest(`/analytics/profit-overview?period=${period}`);
+};
+
+export const getProfitTrends = async (period: string = '30'): Promise<ProfitTrend[]> => {
+  return apiRequest(`/analytics/profit-trends?period=${period}`);
+};