package cn.com.qmth.mps.support;

import java.lang.reflect.Method;
import java.util.Map;
import java.util.Set;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.mvc.condition.PatternsRequestCondition;
import org.springframework.web.servlet.mvc.condition.RequestMethodsRequestCondition;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;

import com.google.common.collect.Maps;
import com.google.common.collect.Sets;

import io.swagger.annotations.ApiOperation;

@Component
@Order(100)
public class ApiInfoHolder implements ApplicationRunner {

	private static final Map<String, ApiInfo> INDEX_BY_MAPPING = Maps.newConcurrentMap();

	private static final Map<Method, ApiInfo> INDEX_BY_METHOD = Maps.newConcurrentMap();

	private static Set<ApiInfo> apiInfoSet = Sets.newHashSet();

	@Autowired
	private RequestMappingHandlerMapping requestMappingHandlerMapping;


	/**
	 * 通过方法获取ApiInfo
	 *
	 * @author 
	 * @param method
	 * @return
	 */
	public static ApiInfo getApiInfo(Method method) {
		return INDEX_BY_METHOD.get(method);
	}

	/**
	 * 通过mapping获取ApiInfo
	 *
	 * @author 
	 * @param mapping
	 * @return
	 */
	public static ApiInfo getApiInfo(String mapping) {
		return INDEX_BY_MAPPING.get(mapping);
	}

	/**
	 * 获取@ApiId注解的ApiInfo集合
	 *
	 * @author 
	 * @return
	 */
	public static Set<ApiInfo> getApiInfoSet() {
		return apiInfoSet;
	}

	@Override
	public void run(ApplicationArguments args) throws Exception {

		Map<RequestMappingInfo, HandlerMethod> map = requestMappingHandlerMapping
				.getHandlerMethods();

		for (Map.Entry<RequestMappingInfo, HandlerMethod> entry : map.entrySet()) {
			RequestMappingInfo requestMappingInfo = entry.getKey();
			HandlerMethod handlerMethod = entry.getValue();

			Class<?> beanType = handlerMethod.getBeanType();

			RequestMapping requestMappingAnnotationOfClass = AnnotationUtils
					.findAnnotation(beanType, RequestMapping.class);

			RequestMapping requestMappingAnnotationOfMethod = handlerMethod
					.getMethodAnnotation(RequestMapping.class);

			WithoutStackTrace withoutStackTrace = handlerMethod
					.getMethodAnnotation(WithoutStackTrace.class);

			ApiOperation apiOperation = handlerMethod.getMethodAnnotation(ApiOperation.class);

			RequestMethodsRequestCondition requestMethodsRequestCondition = requestMappingInfo
					.getMethodsCondition();
			Set<RequestMethod> requestMethodSet = requestMethodsRequestCondition.getMethods();

			String[] mappingURIsOfClass = null;
			String[] mappingURIsOfMethod = null;

			if (null != requestMappingAnnotationOfClass) {
				mappingURIsOfClass = requestMappingAnnotationOfClass.path();
			}
			if (null != requestMappingAnnotationOfMethod) {
				mappingURIsOfMethod = requestMappingAnnotationOfMethod.path();
			}

			String mappingIdentifyOfClass = null;
			String mappingIdentifyOfMethod = null;

			if (null != mappingURIsOfClass) {
				mappingIdentifyOfClass = StringUtils.join(mappingURIsOfClass, ",");
			}
			if (null != mappingURIsOfMethod) {
				mappingIdentifyOfMethod = StringUtils.join(mappingURIsOfMethod, ",");
			}

			String methods = StringUtils.join(requestMethodSet, ",");

			String mapping = StringUtils.join("[", mappingIdentifyOfClass, "][",
					mappingIdentifyOfMethod, "][", methods, "]");

			PatternsRequestCondition patternsRequestCondition = requestMappingInfo
					.getPatternsCondition();

			String requestPath = StringUtils.join(patternsRequestCondition.getPatterns(), ",");

			ApiInfo apiInfo = new ApiInfo();
			if (null != apiOperation) {
				apiInfo.setDescription(apiOperation.value());
			}
			apiInfo.setHttpMethod(methods);
			apiInfo.setMapping(mapping);
			apiInfo.setRequestPath(requestPath);
			apiInfo.setBeanType(beanType);
			if (null != withoutStackTrace) {
				apiInfo.setWithoutStackTrace(withoutStackTrace.value());
			}

			INDEX_BY_METHOD.put(handlerMethod.getMethod(), apiInfo);

			INDEX_BY_MAPPING.put(mapping, apiInfo);
		}
	}

}