package com.ssi.config;

import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.google.common.base.Function;
import springfox.documentation.RequestHandler;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.ParameterBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.schema.ModelRef;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Parameter;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;

import java.util.ArrayList;
import java.util.List;

/**
 * Swagger API配置
 * @author xiaofan
 * @email ssi-zhangxf@dfmc.com.cn
 * @date 2020-01-22 09:22:23
 */
@Configuration
@EnableSwagger2
public class SwaggerConfig {
    // 定义分隔符
    private static final String splitor = ";";

    @Bean
    public Docket createRestApi() {
        ParameterBuilder ticketPar = new ParameterBuilder();
        List<Parameter> pars = new ArrayList<Parameter>();
        ticketPar.name("Authorization").description("认证token")
                .modelRef(new ModelRef("string")).parameterType("header")
                .required(false).build(); //header中的ticket参数非必填，传空也可以
        pars.add(ticketPar.build());    //根据每个方法名也知道当前方法在设置什么参数
        return new Docket(DocumentationType.SWAGGER_2).apiInfo(this.apiInfo()).groupName("SSI")
                .useDefaultResponseMessages(false).enableUrlTemplating(false).select()
                .apis(basePackage("com.ssi.controller")).paths(PathSelectors.any())
                .build()
                .globalOperationParameters(pars);
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder().title("Spring Boot Swagger2").description("SSI-API")
                .termsOfServiceUrl("http://127.0.0.1:8087/").version("0.0.1").build();
    }

    public static Predicate<RequestHandler> basePackage(final String basePackage) {
        return input -> declaringClass(input).transform(handlerPackage(basePackage)).or(true);
    }

    private static Function<Class<?>, Boolean> handlerPackage(final String basePackage) {
        return input -> {
            // 循环判断匹配
            for (String strPackage : basePackage.split(splitor)) {
                boolean isMatch = input.getPackage().getName().startsWith(strPackage);
                if (isMatch) {
                    return true;
                }
            }
            return false;
        };
    }

    private static Optional<? extends Class<?>> declaringClass(RequestHandler input) {
        return Optional.fromNullable(input.declaringClass());
    }

}