package com.tigshop.service.paytype;

import java.math.BigDecimal;

/**
 *  1. 定义策略接口
 */
public interface PaymentTypeStrategy {
    void pay(BigDecimal amount);
}



package com.tigshop.service.paytype;

import org.springframework.stereotype.Component;

import java.math.BigDecimal;

/**
 * 2. 实现多种策略-微信
 */
@Component("wechatPay") // map 注入时使用的名称 注意:很重要
public class WechatPayStrategy implements PaymentTypeStrategy{
    @Override
    public void pay(BigDecimal amount) {
        System.out.println("wechat支付");
    }
}


package com.tigshop.service.paytype;

import org.springframework.stereotype.Component;

import java.math.BigDecimal;

/**
 * 2. 实现多种策略-支付宝
 */
@Component("alipay") // map 注入时使用的名称 注意:很重要
public class AlipayStrategy implements PaymentTypeStrategy{
    @Override
    public void pay(BigDecimal amount) {
        System.out.println("支付宝支付");
    }
}


package com.tigshop.service.paytype;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.math.BigDecimal;
import java.util.Map;

/**
 * 3. 使用策略上下文
 */
@Service
public class PaymentTypeService {

    // 注入所有实现，Map的key是Bean的名字，value是策略某一个支付实现类
    @Autowired
    private Map<String, PaymentTypeStrategy> strategyMap;

    public void pay(String channel, BigDecimal amount) {
        PaymentTypeStrategy strategy = strategyMap.get(channel);
        if (strategy != null) {
            strategy.pay(amount);
        } else {
            throw new IllegalArgumentException("Unsupported channel");
        }
    }

}


/**
 * 支付控制器
 *
 * @author kidd
 * @create 2025/7/7
 */
@Tag(name = "支付控制器", description = "支付控制器功能")
@RequiredArgsConstructor
@RestController
@RequestMapping("/adminapi/pay")
public class OrderController {

    @Autowired
    private PaymentTypeService paymentTypeService;

    @GetMapping("/pay")
    @Operation(summary = "不同支付厂商接口")
    public OrderVO pay() {
        paymentTypeService.pay("wechatPay", BigDecimal.ZERO);
        paymentTypeService.pay("alipay", BigDecimal.ZERO);
        return orderService.detail(id);
    }
 
}

/**
* 构造函数注入策略类 
applicationContext.getBeansOfType(ExpressStrategy.class); 防止空指针注入失败
**/
@Component
public class ExpressStrategyFactory implements ApplicationContextAware {



    private Map<ExpressCompanyEnum, ExpressStrategy> strategyMap;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        // 获取所有ExpressStrategy的实现类
        Map<String, ExpressStrategy> beans = applicationContext.getBeansOfType(ExpressStrategy.class);

        // 构建快递公司到策略的映射
        strategyMap = new HashMap<>();
        for (ExpressStrategy strategy : beans.values()) {
            strategyMap.put(strategy.getCompany(), strategy);
        }
    }
}