package com.example.northglasserpclient.config;

import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.servlet.mvc.method.RequestMappingInfoHandlerMapping;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.spring.web.plugins.WebFluxRequestHandlerProvider;
import springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider;
import springfox.documentation.swagger2.annotations.EnableSwagger2WebMvc;

import java.lang.reflect.Field;
import java.util.List;
import java.util.stream.Collectors;

@Configuration
@EnableSwagger2WebMvc
public class Knife4jConfig {


    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                // apiInfo()：配置 API 的一些基本信息，比如：文档标题title，文档描述description，文档版本号version
                .apiInfo(apiInfo())
                // select()：生成 API 文档的选择器，用于指定要生成哪些 API 文档
                .select()
                // apis()：指定要生成哪个包下的 API 文档
                .apis(RequestHandlerSelectors.basePackage("com.example.northglasserpclient.controller"))
                // paths()：指定要生成哪个 URL 匹配模式下的 API 文档。这里使用 PathSelectors.any()，表示生成所有的 API 文档。
                .paths(PathSelectors.any())
                .build();
    }
    private static final String API_TILE="erp-customer-client";
    //文档信息配置
    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                // 文档标题
                .title(API_TILE)
                // 文档描述信息
                .description("erp-customer-client在线API文档")
                // 文档版本号
                .version("1.0")
                .build();
    }
    @Bean
    public static BeanPostProcessor springfoxHandlerProviderBeanPostProcessor() {
        return new BeanPostProcessor() {

            @Override
            public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
                if (bean instanceof WebMvcRequestHandlerProvider || bean instanceof WebFluxRequestHandlerProvider) {
                    customizeSpringfoxHandlerMappings(getHandlerMappings(bean));
                }
                return bean;
            }

            private <T extends RequestMappingInfoHandlerMapping> void customizeSpringfoxHandlerMappings(List<T> mappings) {
                List<T> copy = mappings.stream()
                        .filter(mapping -> mapping.getPatternParser() == null)
                        .collect(Collectors.toList());
                mappings.clear();
                mappings.addAll(copy);
            }

            @SuppressWarnings("unchecked")
            private List<RequestMappingInfoHandlerMapping> getHandlerMappings(Object bean) {
                try {
                    Field field = ReflectionUtils.findField(bean.getClass(), "handlerMappings");
                    field.setAccessible(true);
                    return (List<RequestMappingInfoHandlerMapping>) field.get(bean);
                } catch (IllegalArgumentException | IllegalAccessException e) {
                    throw new IllegalStateException(e);
                }
            }
        };
    }



}