package com.xwbing.configuration;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import com.xwbing.handler.LoginInterceptor;
import com.xwbing.handler.UrlPermissionsInterceptor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.Ordered;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.*;

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

/**
 * 说明: servlet上下文配置
 * 项目名称: boot-module-pro
 * 创建时间: 2017/5/10 16:36
 * 作者:  xiangwb
 */
@Slf4j
@Configuration
@PropertySource("classpath:config.properties")
public class DispatcherServletConfig extends WebMvcConfigurerAdapter {
    @Value("${loginInterceptorEnable}")
    private boolean loginInterceptorEnable;
    @Value("${urlPermissionsInterceptorEnable}")
    private boolean urlPermissionsInterceptorEnable;

    /***
     * 添加拦截器
     * @param registry
     */
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        if (loginInterceptorEnable) {
            log.info("注册登录拦截器LoginInterceptor ======================= ");
            registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/**").excludePathPatterns("/user/login");
        }
        if (urlPermissionsInterceptorEnable) {
            log.info("注册权限拦截器UrlPermissionsInterceptor ======================= ");
            registry.addInterceptor(urlPermissionsInterceptor()).addPathPatterns("/**").excludePathPatterns("/user/login");
        }
        super.addInterceptors(registry);
    }

    /**
     * 权限拦截器
     *
     * @return
     */
    @Bean
    public UrlPermissionsInterceptor urlPermissionsInterceptor() {
        return new UrlPermissionsInterceptor();
    }

    /**
     * 配置静态访问资源
     * 访问时不需要前缀
     * 默认:优先级
     * /**映射到
     * classpath:/META-INF/resources
     * classpath:/resources
     * classpath:/static
     * classpath:/public
     *
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //swagger
//        registry.addResourceHandler("swagger-ui.html").addResourceLocations("classpath:/META-INF/resources/");
//        registry.addResourceHandler("/webjars/**").addResourceLocations("classpath:/META-INF/resources/webjars/");
        //服务器部署的tomcat下html路径
//        registry.addResourceHandler("/js/**").addResourceLocations("html/js/");
//        registry.addResourceHandler("/css/**").addResourceLocations("html/css/");
//        registry.addResourceHandler("/img/**").addResourceLocations("html/img/");
        super.addResourceHandlers(registry);
    }

    /**
     * 视图配置
     *
     * @param registry
     */
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        //路由配置
        registry.addViewController("druid").setViewName("druid/index.html");
        //重定向
        registry.addRedirectViewController("doc", "swagger-ui.html");
        registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
        super.addViewControllers(registry);
    }

    /**
     * 解决跨域
     *
     * @param registry
     */
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowCredentials(true)
                .allowedOrigins("*")
                .allowedHeaders("*")
                .allowedMethods("GET", "POST", "DELETE", "PUT", "PATCH", "OPTIONS")
                .maxAge(3600);
        super.addCorsMappings(registry);
    }

    /**
     * 扩展消息转换器，增加fastJson
     *
     * @param converters
     */
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.add(getFastJsonHttpMessageConverter());
        super.configureMessageConverters(converters);
    }

    /**
     * fastJson消息转换器(处理@RequestBody/@ResponseBody注解的入参或返回值)
     *
     * @return
     */
    @Bean
    public HttpMessageConverter getFastJsonHttpMessageConverter() {
        FastJsonHttpMessageConverter messageConverter = new FastJsonHttpMessageConverter();
        //设置支持的Content-Type
        List<MediaType> mediaTypes = new ArrayList<>();
        mediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        mediaTypes.add(MediaType.APPLICATION_FORM_URLENCODED);
        mediaTypes.add(MediaType.MULTIPART_FORM_DATA);
        mediaTypes.add(MediaType.APPLICATION_OCTET_STREAM);
        mediaTypes.add(MediaType.TEXT_HTML);
        messageConverter.setSupportedMediaTypes(mediaTypes);
        //不忽略对象属性中的null值
        FastJsonConfig fastJsonConfig = new FastJsonConfig();
        fastJsonConfig.setSerializerFeatures(
                SerializerFeature.PrettyFormat,
                SerializerFeature.WriteMapNullValue,//输出所有为null的字段
//                SerializerFeature.WriteNullNumberAsZero,//包装类字段如果为null,输出为0,而非null
//                SerializerFeature.WriteNullStringAsEmpty,//字符类型字段如果为null,输出为"",而非null
                SerializerFeature.WriteNullListAsEmpty);//List字段如果为null,输出为[],而非null
        messageConverter.setFastJsonConfig(fastJsonConfig);
        return messageConverter;
    }
}