package com.zy.acs.manager.common.interceptor;

import com.zy.acs.manager.common.annotation.IntegrationAuth;
import com.zy.acs.manager.core.domain.type.NamespaceType;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Intercepts open API calls so they can be audited via IntegrationRecordAdvice.
 */
@Slf4j
@Component
public class IntegrationOpenApiInterceptor implements HandlerInterceptor {

    private static final String ATTR_CONTEXT = IntegrationOpenApiInterceptor.class.getName() + ".CONTEXT";

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
        if (!(handler instanceof HandlerMethod)) {
            return true;
        }
        HandlerMethod handlerMethod = (HandlerMethod) handler;
        IntegrationAuth integrationAuth = findIntegrationAuth(handlerMethod);
        if (integrationAuth == null || integrationAuth.value() == IntegrationAuth.Enable.SKIP_LOG) {
            return true;
        }

        NamespaceType namespaceType = integrationAuth.name() == null ? NamespaceType.NONE : integrationAuth.name();
        IntegrationRequestContext context = new IntegrationRequestContext(
                namespaceType,
                handlerMethod.getBeanType().getSimpleName() + "#" + handlerMethod.getMethod().getName(),
                System.currentTimeMillis()
        );
        request.setAttribute(ATTR_CONTEXT, context);
        return true;
    }

    public static IntegrationRequestContext getContext(HttpServletRequest request) {
        Object attribute = request.getAttribute(ATTR_CONTEXT);
        if (attribute instanceof IntegrationRequestContext) {
            return (IntegrationRequestContext) attribute;
        }
        return null;
    }

    private IntegrationAuth findIntegrationAuth(HandlerMethod handlerMethod) {
        IntegrationAuth annotation = AnnotatedElementUtils.findMergedAnnotation(handlerMethod.getMethod(), IntegrationAuth.class);
        if (annotation != null) {
            return annotation;
        }
        return AnnotatedElementUtils.findMergedAnnotation(handlerMethod.getBeanType(), IntegrationAuth.class);
    }

    @Getter
    public static class IntegrationRequestContext {

        private IntegrationRequestContext(NamespaceType namespaceType, String handler, long startAt) {
            this.namespaceType = namespaceType;
            this.handler = handler;
            this.startAt = startAt;
        }

        private final NamespaceType namespaceType;
        private final String handler;
        private final long startAt;

    }

}