pie chart for food added

src/modules/orders/providers/orders.service.ts

@@ -507,4 +507,58 @@ export class OrdersService {
       };
     });
   }
+
+  async getFoodSalesPieChart(restId: string) {
+    return this.em.transactional(async em => {
+      // Calculate last month date range
+      const now = new Date();
+      const firstDayOfLastMonth = new Date(now.getFullYear(), now.getMonth() - 1, 1);
+      const lastDayOfLastMonth = new Date(now.getFullYear(), now.getMonth(), 0, 23, 59, 59, 999);
+
+      // Query order items from orders in the last month
+      // Only include completed orders (excluding canceled and pending)
+      const result = await em.execute(
+        `
+        SELECT 
+          f.id as food_id,
+          f.title as food_title,
+          COALESCE(SUM(oi.quantity), 0)::int as total_quantity,
+          COALESCE(SUM(oi.total_price), 0)::numeric as total_revenue
+        FROM order_items oi
+        INNER JOIN orders o ON oi.order_id = o.id
+        INNER JOIN foods f ON oi.food_id = f.id
+        WHERE o.restaurant_id = ?
+          AND o.created_at >= ?
+          AND o.created_at <= ?
+          AND o.status NOT IN ('pendingPayment', 'canceled')
+        GROUP BY f.id, f.title
+        ORDER BY total_revenue DESC
+        `,
+        [restId, firstDayOfLastMonth, lastDayOfLastMonth],
+      );
+
+      // Calculate total revenue for percentage calculation
+      const totalRevenue = result.reduce((sum: number, item: any) => {
+        return sum + Number(item.total_revenue || 0);
+      }, 0);
+
+      // Format data for pie chart and calculate percentages
+      const chartData = result.map((item: any) => ({
+        foodId: item.food_id,
+        foodTitle: item.food_title || 'Unknown',
+        quantity: Number(item.total_quantity || 0),
+        revenue: Number(item.total_revenue || 0),
+        percentage: totalRevenue > 0 ? Number(((Number(item.total_revenue || 0) / totalRevenue) * 100).toFixed(2)) : 0,
+      }));
+
+      return {
+        period: {
+          startDate: firstDayOfLastMonth.toISOString(),
+          endDate: lastDayOfLastMonth.toISOString(),
+        },
+        totalRevenue,
+        data: chartData,
+      };
+    });
+  }
 }