package com.ruoyi.framework.config;

import com.github.xiaoymin.knife4j.spring.annotations.EnableKnife4j;
import com.github.xiaoymin.knife4j.spring.extension.OpenApiExtensionResolver;
import com.ruoyi.common.properties.TokenProperties;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.spring.SpringUtils;
import com.ruoyi.framework.config.properties.SwaggerProperties;
import io.swagger.models.auth.In;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.*;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spi.service.contexts.SecurityContext;
import springfox.documentation.spring.web.plugins.Docket;

import javax.annotation.PostConstruct;
import java.util.ArrayList;
import java.util.List;

/**
 * Swagger 文档配置
 *
 * @author Lion Li
 */
@Configuration
@EnableKnife4j
public class SwaggerConfig {

    @Autowired
    private SwaggerProperties swaggerProperties;

    @Autowired
	private TokenProperties tokenProperties;

    @Autowired
    private OpenApiExtensionResolver openApiExtensionResolver;

    /**
     * 创建API
     */
    @PostConstruct
    public void createRestApi() {
		for (SwaggerProperties.Groups group : swaggerProperties.getGroups()) {
			String basePackage = group.getBasePackage();
			Docket docket = new Docket(DocumentationType.OAS_30)
					.enable(swaggerProperties.getEnabled())
					// 用来创建该API的基本信息，展示在文档的页面中（自定义展示的信息）
					.apiInfo(apiInfo())
					// 设置哪些接口暴露给Swagger展示
					.select()
					// 扫描所有有注解的api，用这种方式更灵活
					//.apis(RequestHandlerSelectors.withMethodAnnotation(ApiOperation.class))
					// 扫描指定包中的swagger注解
					.apis(RequestHandlerSelectors.basePackage(basePackage))
					// 扫描所有 .apis(RequestHandlerSelectors.any())
					.paths(PathSelectors.any())
					.build()
					.groupName(group.getName())
					// 设置安全模式，swagger可以设置访问token
					.securitySchemes(securitySchemes())
					.securityContexts(securityContexts())
                    .extensions(openApiExtensionResolver.buildExtensions(group.getName()))
					.pathMapping(swaggerProperties.getPathMapping());
			String beanName = StringUtils.substringAfterLast(basePackage, ".") + "Docket";
			SpringUtils.registerBean(beanName, docket);
		}
    }

    /**
     * 安全模式，这里指定token通过Authorization头请求头传递
     */
    private List<SecurityScheme> securitySchemes() {
        List<SecurityScheme> apiKeyList = new ArrayList<SecurityScheme>();
		String header = tokenProperties.getHeader();
		apiKeyList.add(new ApiKey(header, header, In.HEADER.toValue()));
        return apiKeyList;
    }

    /**
     * 安全上下文
     */
    private List<SecurityContext> securityContexts() {
        List<SecurityContext> securityContexts = new ArrayList<>();
        securityContexts.add(
                SecurityContext.builder()
                        .securityReferences(defaultAuth())
                        .operationSelector(o -> o.requestMappingPattern().matches("/.*"))
                        .build());
        return securityContexts;
    }

    /**
     * 默认的安全上引用
     */
    private List<SecurityReference> defaultAuth() {
        AuthorizationScope authorizationScope = new AuthorizationScope("global", "accessEverything");
        AuthorizationScope[] authorizationScopes = new AuthorizationScope[1];
        authorizationScopes[0] = authorizationScope;
        List<SecurityReference> securityReferences = new ArrayList<>();
        securityReferences.add(new SecurityReference(tokenProperties.getHeader(), authorizationScopes));
        return securityReferences;
    }

    /**
     * 添加摘要信息
     */
    private ApiInfo apiInfo() {
        // 用ApiInfoBuilder进行定制
        SwaggerProperties.Contact contact = swaggerProperties.getContact();
        return new ApiInfoBuilder()
                // 设置标题
                .title(swaggerProperties.getTitle())
                // 描述
                .description(swaggerProperties.getDescription())
                // 作者信息
                .contact(new Contact(contact.getName(), contact.getUrl(), contact.getEmail()))
                // 版本
                .version(swaggerProperties.getVersion())
                .build();
    }
}