package com.cnbm.config;

import com.cnbm.common.constant.Constant;
import com.google.common.collect.Lists;
import io.swagger.annotations.ApiOperation;
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.context.annotation.Profile;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
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.oas.annotations.EnableOpenApi;
import springfox.documentation.service.*;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spi.service.contexts.SecurityContext;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.spring.web.plugins.WebFluxRequestHandlerProvider;
import springfox.documentation.spring.web.plugins.WebMvcRequestHandlerProvider;

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

import static com.google.common.collect.Lists.newArrayList;

/**
 * @Author weihongyang
 * @Date 2022/6/21 10:56 AM
 * @Version 1.0
 */
@Configuration
@EnableOpenApi
@Profile("dev")
@EnableWebMvc
public class SwaggerConfig {

    /**
     * 创建API应用
     * apiInfo() 增加API相关信息
     * 通过select()函数返回一个ApiSelectorBuilder实例,用来控制哪些接口暴露给Swagger来展现，
     * 本例采用指定扫描的包路径来定义指定要建立API的目录。
     *
     * @return
     */
    @Bean
    public Docket restApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("全部接口")
                .apiInfo(apiInfo("Spring Boot中使用Swagger2构建RESTful APIs", "1.0"))
                .useDefaultResponseMessages(true)
                .forCodeGeneration(false)
                .select()
                .apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                .paths(PathSelectors.any())
                .build()
                .securityContexts(Arrays.asList(securityContext()))
                // ApiKey的name需与SecurityReference的reference保持一致
                .securitySchemes(Arrays.asList(new ApiKey("token", "token", "header")));
    }

    @Bean
    public Docket adminApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("admin模块接口")
                .apiInfo(apiInfo("Spring Boot中使用Swagger2构建RESTful APIs", "1.0"))
                .useDefaultResponseMessages(true)
                .forCodeGeneration(false)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.cnbm.admin"))
                .paths(PathSelectors.any())
                .build()
                .securityContexts(Arrays.asList(securityContext()))
                // ApiKey的name需与SecurityReference的reference保持一致
                .securitySchemes(Arrays.asList(new ApiKey("token", "token", "header")));
    }

    @Bean
    public Docket basicApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("ym-basic")
                .apiInfo(apiInfos("basic", "基础资料模块"))
                .useDefaultResponseMessages(true)
                .forCodeGeneration(false)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.cnbm.basic"))
                .paths(PathSelectors.any())
                .build()
                .securityContexts(Arrays.asList(securityContext()))
                // ApiKey的name需与SecurityReference的reference保持一致
                .securitySchemes(Arrays.asList(new ApiKey("token", "token", "header")));
    }

    @Bean
    public Docket influxApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .groupName("ym-influx")
                .apiInfo(apiInfos("influx", "influx模块"))
                .useDefaultResponseMessages(true)
                .forCodeGeneration(false)
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.cnbm.influx"))
                .paths(PathSelectors.any())
                .build()
                .securityContexts(Arrays.asList(securityContext()))
                // ApiKey的name需与SecurityReference的reference保持一致
                .securitySchemes(Arrays.asList(new ApiKey("token", "token", "header")));
    }

    /**
     * 创建该API的基本信息（这些基本信息会展现在文档页面中）
     * 访问地址：http://ip:port/swagger-ui.html
     *
     * @return
     */
    private ApiInfo apiInfo(String title, String version) {
        return new ApiInfoBuilder()
                .title(title)
                .description("ym-pass文档")
                .termsOfServiceUrl("https://www.baidu.com/")
                .version(version)
                .build();
    }
    private ApiInfo apiInfos(String title, String desc) {
        return new ApiInfoBuilder()
                .title(title)
                .description(desc)
                .termsOfServiceUrl("https://www.baidu.com/")
                .version("1.0")
                .build();
    }

    private SecurityContext securityContext() {
        return SecurityContext.builder()
                .securityReferences(defaultAuth())
                .build();
    }

    List<SecurityReference> defaultAuth() {
        AuthorizationScope authorizationScope
                = new AuthorizationScope("global", "accessEverything");
        AuthorizationScope[] authorizationScopes = new AuthorizationScope[1];
        authorizationScopes[0] = authorizationScope;
        return Lists.newArrayList(
                new SecurityReference(Constant.TOKEN_HEADER, authorizationScopes));
    }

    @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);
                }
            }
        };
    }

}