package com.mqttsnet.thinglinks.gateway.config;

import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.config.ResourceHandlerRegistry;
import org.springframework.web.reactive.config.WebFluxConfigurer;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

/**
 * 聚合系统接口
 * 
 * @author thinglinks
 */
@Component
public class SwaggerProvider implements SwaggerResourcesProvider, WebFluxConfigurer
{
    /**
     * Swagger2默认的url后缀
     */
    public static final String SWAGGER2URL = "/v2/api-docs";
    /**
     * 网关路由
     */
    @Autowired
    private RouteLocator routeLocator;

    @Autowired
    private GatewayProperties gatewayProperties;

    /**
     * 聚合其他服务接口
     * 
     * @return
     */
    @Override
    public List<SwaggerResource> get()
    {
        List<SwaggerResource> resourceList = new ArrayList<>();
        List<String> routes = new ArrayList<>();
        // 获取网关中配置的route
        routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
        gatewayProperties.getRoutes().stream()
                .filter(routeDefinition -> routes
                        .contains(routeDefinition.getId()))
                .forEach(routeDefinition -> routeDefinition.getPredicates().stream()
                        .filter(predicateDefinition -> "Path".equalsIgnoreCase(predicateDefinition.getName()))
                        .filter(predicateDefinition -> !"mqtts-auth".equalsIgnoreCase(routeDefinition.getId()))
                        .forEach(predicateDefinition -> resourceList
                                .add(swaggerResource(routeDefinition.getId(), predicateDefinition.getArgs()
                                        .get(NameUtils.GENERATED_NAME_PREFIX + "0").replace("/**", SWAGGER2URL)))));
        return resourceList;
    }

    private SwaggerResource swaggerResource(String name, String location)
    {
        SwaggerResource swaggerResource = new SwaggerResource();
        swaggerResource.setName(name);
        swaggerResource.setLocation(location);
        swaggerResource.setSwaggerVersion("2.0");
        return swaggerResource;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry)
    {
        /** swagger-ui 地址 */
        registry.addResourceHandler("/swagger-ui/**")
                .addResourceLocations("classpath:/META-INF/resources/webjars/springfox-swagger-ui/");
    }
}
