Add order statistics calculation

Problem Context

Business needs daily statistics on orders. Calculate averages and totals for dashboard.

Intermediate
100 points

File Changes (1)

src/main/java/com/example/service/OrderStatisticsService.java ADDED
@@ -0 +1 @@
1 +package com.example.service;
2 +
3 +import org.springframework.stereotype.Service;
4 +import java.math.BigDecimal;
5 +import java.util.Comparator;
6 +import java.util.List;
7 +
8 +@Service
9 +public class OrderStatisticsService {
10 +
11 + private final OrderRepository orderRepository;
12 +
13 + public DailyStats calculateDailyStats(LocalDate date) {
14 + List<Order> orders = orderRepository.findByOrderDate(date);
15 +
16 + BigDecimal total = orders.stream()
17 + .map(Order::getAmount)
18 + .reduce(BigDecimal::add)
19 + .get();
20 +
21 + BigDecimal average = total.divide(BigDecimal.valueOf(orders.size()));
22 +
23 + BigDecimal maxOrder = orders.stream()
24 + .map(Order::getAmount)
25 + .max(Comparator.naturalOrder())
26 + .get();
27 +
28 + return new DailyStats(orders.size(), total, average, maxOrder);
29 + }
30 +}
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