package com.oying.modules.pc.product.service.impl;

import com.oying.modules.pc.product.domain.dto.ProductCreateRequest;
import com.oying.modules.pc.product.domain.enums.ProductCreationType;
import com.oying.modules.pc.product.service.ProductCreationStrategy;
import org.springframework.stereotype.Component;

import javax.annotation.PostConstruct;
import java.util.List;
import java.util.Map;
import java.util.function.Function;
import java.util.stream.Collectors;

@Component
public class ProductCreationContext {

    private final Map<ProductCreationType, ProductCreationStrategy> strategies;

    // Spring会自动注入所有ProductCreationStrategy的实现
    public ProductCreationContext(List<ProductCreationStrategy> strategyList) {
        this.strategies = strategyList.stream()
                .collect(Collectors.toMap(
                        ProductCreationStrategy::getType,
                        Function.identity()
                ));
    }

    @PostConstruct
    public void validateStrategies() {
        if (strategies.isEmpty()) {
            throw new IllegalStateException("未配置任何商品创建策略，应用无法正常启动");
        }
    }

    public void createProduct(ProductCreateRequest request, ProductCreationType type) {

        ProductCreationStrategy strategy = strategies.get(type);

        if (strategy == null) {
            throw new IllegalArgumentException("不支持的创建类型或参数类型不匹配");
        }

        strategy.create(request);

        // 使用反射调用，或者更好的方式...
        // invokeStrategy(strategy, request);
    }

    /*
    private void invokeStrategy(ProductCreationStrategy<?> strategy, ProductCreationRequest request) {
        try {
            Method createMethod = strategy.getClass().getMethod("create", request.getClass());
            createMethod.invoke(strategy, request);
        } catch (Exception e) {
            throw new RuntimeException("执行商品创建策略失败", e);
        }
    }*/

}