homework/AmountAnalysisStrategy.java

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class AmountAnalysisStrategy implements OrderAnalysisStrategy {
    @Override
    public Map<String, Object> analyze(List<Order> orders) {
        Map<String, Object> result = new HashMap<>();
        
        if (orders == null || orders.isEmpty()) {
            result.put("message", "没有订单数据可供分析");
            return result;
        }
        
        double totalAmount = 0;
        double maxAmount = Double.MIN_VALUE;
        double minAmount = Double.MAX_VALUE;
        double totalDiscount = 0;
        
        for (Order order : orders) {
            double finalAmount = order.getFinalAmount();
            totalAmount += finalAmount;
            totalDiscount += order.getDiscountAmount();
            
            if (finalAmount > maxAmount) {
                maxAmount = finalAmount;
            }
            if (finalAmount < minAmount) {
                minAmount = finalAmount;
            }
        }
        
        double averageAmount = totalAmount / orders.size();
        
        result.put("totalOrders", orders.size());
        result.put("totalAmount", totalAmount);
        result.put("averageAmount", averageAmount);
        result.put("maxAmount", maxAmount);
        result.put("minAmount", minAmount);
        result.put("totalDiscount", totalDiscount);
        result.put("discountPercentage", (totalDiscount / (totalAmount + totalDiscount)) * 100);
        
        return result;
    }
    
    @Override
    public String getAnalysisName() {
        return "金额统计分析";
    }
    
    @Override
    public String getDescription() {
        return "分析订单的金额分布情况，包括总金额、平均金额、最大/最小金额以及折扣统计";
    }
}