package com.shkpr.service.alambizplugin.configuration;

import com.shkpr.service.alambizplugin.SpringContextUtil;
import com.shkpr.service.alambizplugin.commproperties.AsyncTaskProperties;
import com.shkpr.service.alambizplugin.commproperties.TempFileProperties;
import com.shkpr.service.alambizplugin.constants.ApiURI;
import com.shkpr.service.alambizplugin.interfaces.URIInterceptorIntef;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;
import org.springframework.http.HttpMethod;
import org.springframework.util.StringUtils;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

/**
 * 该类主要用来注册各种Controller拦截器
 * WebSecurityConfig类中注册的过滤器JWTLoginFilter、JWTAuthenticationFilter优先于该类中注册的拦截器URIInterceptorIntef
 * 过滤拦截顺序: JWTLoginFilter--->JWTAuthenticationFilter--->URIInterceptorIntef
 */
@Configuration
@EnableWebMvc
public class WebMvcConfiguration implements WebMvcConfigurer {
    private final TempFileProperties tempFileProperties;
    private final AsyncTaskProperties asyncTaskProperties;

    public WebMvcConfiguration(TempFileProperties tempFileProperties , AsyncTaskProperties asyncTaskProperties) {
        this.tempFileProperties = tempFileProperties;
        this.asyncTaskProperties = asyncTaskProperties;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //临时文件映射
        registry.addResourceHandler(ApiURI.URI_GIS_SURVEY_H + "/" + ApiURI.URI_XXX_TEMP_FILES + "/**")
                .addResourceLocations("file:" + tempFileProperties.getResourcePath() + "/");
        //异步结果映射
        registry.addResourceHandler(ApiURI.URI_GIS_SURVEY_H + "/" + ApiURI.URI_XXX_ASYNC_RESULTS + "/**")
                .addResourceLocations("file:" + asyncTaskProperties.getResultPath() + "/");
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        @SuppressWarnings("static-access")
        Map<String, URIInterceptorIntef> mapURLInterceptorByOrder = new TreeMap<String, URIInterceptorIntef>(); //TreeMap默认按键值升序
        Map<String, URIInterceptorIntef> mapURLInterceptor = SpringContextUtil.getApplicationContext().getBeansOfType(URIInterceptorIntef.class);  //获取URIInterceptorIntef类型的所有Component组件
        if (!StringUtils.isEmpty(mapURLInterceptor)){
            Iterator it = mapURLInterceptor.entrySet().iterator();
            while (it.hasNext()){
                Map.Entry entry = (Map.Entry)it.next();
                URIInterceptorIntef urlInterceptor = (URIInterceptorIntef)entry.getValue();
                if (urlInterceptor != null){
                    mapURLInterceptorByOrder.put(String.valueOf(urlInterceptor.order()), urlInterceptor);
                }
            }
        }

        if (!StringUtils.isEmpty(mapURLInterceptorByOrder)){
            Iterator it = mapURLInterceptorByOrder.entrySet().iterator();
            while (it.hasNext()){
                Map.Entry entry = (Map.Entry)it.next();
                //System.out.println("WebMvcConfig::addInterceptors() key="+(String) entry.getKey());
                URIInterceptorIntef urlInterceptor = (URIInterceptorIntef)entry.getValue();
                if (urlInterceptor != null){
                    String[] arrForbidUrls = urlInterceptor.forbidPathPatterns();
                    if (arrForbidUrls == null)
                        arrForbidUrls = new String[]{};
                    String[] arrExcludeUrls = urlInterceptor.excludePathPatterns();
                    if (arrExcludeUrls == null){
                        //多个拦截器将按照链接的顺序依次匹配拦截(注：有可能多个拦截器都匹配成功，则多个拦截器依次执行）
                        registry.addInterceptor(urlInterceptor).addPathPatterns(arrForbidUrls);
                    }else{
                        registry.addInterceptor(urlInterceptor).addPathPatterns(arrForbidUrls).excludePathPatterns(arrExcludeUrls);
                    }
                }
            }
        }
        //super.addInterceptors(registry);
    }

    //解决跨域问题
    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*");
        //corsConfiguration.addAllowedMethod("*");
        corsConfiguration.addAllowedMethod(HttpMethod.POST);
        corsConfiguration.addAllowedMethod(HttpMethod.GET);
        corsConfiguration.addAllowedMethod(HttpMethod.PUT);
        corsConfiguration.addAllowedMethod(HttpMethod.DELETE);
        corsConfiguration.addAllowedMethod(HttpMethod.OPTIONS);
        corsConfiguration.addAllowedMethod(HttpMethod.HEAD);
        corsConfiguration.addAllowedHeader("x-requested-with,Content-Type,Authorization,user-agent,Timestamp,Sequence,Signature");
        return corsConfiguration;
    }

    //解决跨域问题
    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }

    //配置该服务的默认首页用于阿里云服务SLB的http head健康检查
    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/").setViewName("index");
        registry.setOrder(Ordered.HIGHEST_PRECEDENCE);
        //super.addViewControllers(registry);
    }

}