package com.javaweb.app.common.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import com.google.common.base.Function;
import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.javaweb.common.config.Global;

import io.swagger.annotations.ApiOperation;
import springfox.documentation.RequestHandler;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

/**
 * Swagger2的接口配置
 * 
 * @author ruoyi
 */
@Configuration
@EnableSwagger2
public class SwaggerConfig
{
    /**
     * 创建API
     */
    @Bean
    public Docket createRestApi()
    {
        return new Docket(DocumentationType.SWAGGER_2)
                // 详细定制
                .apiInfo(apiInfo()).select().apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
                // 指定当前包路径
                // .apis(RequestHandlerSelectors.basePackage("com.javaweb.web.controller.tool"))
                // .apis(basePackage("com.javaweb.web.controller.system,com.javaweb.web.controller.tool"))
                // 扫描所有 .apis(RequestHandlerSelectors.any())
                .paths(PathSelectors.any()).build();
    }

    /**
     * 添加摘要信息
     */
    private ApiInfo apiInfo()
    {
        // 用ApiInfoBuilder进行定制
        return new ApiInfoBuilder().title("标题：系统_接口文档").description("描述：.....")
                .contact(new Contact(Global.getName(), null, null)).version("版本号:" + Global.getVersion()).build();
    }

    /**
     * Predicate that matches RequestHandler with given base package name for the class of the handler method.
     * This predicate includes all request handlers matching the provided basePackage
     *
     * @param basePackage - base package of the classes
     * @return this
     */
    public static Predicate<RequestHandler> basePackage(final String basePackage)
    {
        return new Predicate<RequestHandler>()
        {
            @Override
            public boolean apply(RequestHandler input)
            {
                return declaringClass(input).transform(handlerPackage(basePackage)).or(true);
            }
        };
    }

    /**
     * 处理包路径配置规则,支持多路径扫描匹配以逗号隔开
     * 
     * @param basePackage 扫描包路径
     * @return Function
     */
    private static Function<Class<?>, Boolean> handlerPackage(final String basePackage)
    {
        return new Function<Class<?>, Boolean>()
        {
            @Override
            public Boolean apply(Class<?> input)
            {
                for (String strPackage : basePackage.split(","))
                {
                    boolean isMatch = input.getPackage().getName().startsWith(strPackage);
                    if (isMatch)
                    {
                        return true;
                    }
                }
                return false;
            }
        };
    }

    /**
     * @param input RequestHandler
     * @return Optional
     */
    @SuppressWarnings("deprecation")
    private static Optional<? extends Class<?>> declaringClass(RequestHandler input)
    {
        return Optional.fromNullable(input.declaringClass());
    }
}