/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.be.filters;

import org.apache.http.HttpStatus;
import org.openecomp.sdc.be.components.impl.exceptions.ByActionStatusComponentException;
import org.openecomp.sdc.be.components.impl.exceptions.ComponentException;
import org.openecomp.sdc.be.config.Configuration;
import org.openecomp.sdc.be.dao.api.ActionStatus;
import org.openecomp.sdc.be.servlets.exception.ComponentExceptionMapper;
import org.openecomp.sdc.common.api.FilterDecisionEnum;
import org.openecomp.sdc.common.log.wrappers.Logger;
import org.openecomp.sdc.common.util.ThreadLocalsHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.HttpHeaders;
import java.io.IOException;
import java.util.List;
import java.util.stream.Stream;

@Component("gatewayFilter")
public class GatewayFilter implements Filter {

    private Configuration.CookieConfig authCookieConf;
    private Configuration config;
    private static final Logger log = Logger.getLogger(BeServletFilter.class);

    @Autowired
    private ThreadLocalUtils threadLocalUtils;
    @Autowired
    private ComponentExceptionMapper componentExceptionMapper;


    public GatewayFilter(org.openecomp.sdc.be.config.Configuration configuration) {
        this.authCookieConf = configuration.getAuthCookie();
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest httpRequest = (HttpServletRequest) req;
        HttpServletResponse httpResponse = (HttpServletResponse) res;
        try {
            if (isUrlFromWhiteList(httpRequest) || isConsumerBusinessLogic()) {
                ThreadLocalsHolder.setApiType(FilterDecisionEnum.NA);
                threadLocalUtils.setUserContextFromDB(httpRequest);
                filterChain.doFilter(httpRequest, res);
//            } else if (isCookieExist(httpRequest, authCookieConf.getCookieName())) {
//                ThreadLocalsHolder.setApiType(FilterDecisionEnum.INTERNAL);
//                filterChain.doFilter(httpRequest, res);
//            } else {
//                validateAuthHeaderExist(httpRequest);
//                ThreadLocalsHolder.setApiType(FilterDecisionEnum.EXTERNAL);
//                filterChain.doFilter(httpRequest, res);
            }
        } catch (ComponentException ce) {
            componentExceptionMapper.writeToResponse(ce, httpResponse);

        } catch (WebApplicationException we) {
            httpResponse.setStatus(we.getResponse().getStatus());
            setDefaultHttpParams(httpResponse);
            httpResponse.getWriter().write(we.getMessage());

        } catch (Exception ex) {
            httpResponse.setStatus(HttpStatus.SC_INTERNAL_SERVER_ERROR);
            setDefaultHttpParams(httpResponse);
            httpResponse.getWriter().write(ex.getMessage());
        }
    }

    private void setDefaultHttpParams(HttpServletResponse httpResponse) {
        httpResponse.setContentType("application/json");
        httpResponse.setCharacterEncoding("UTF-8");
    }

    private boolean isCookieExist(HttpServletRequest httpRequest, String cookieName) {
        Cookie[] cookies = httpRequest.getCookies();
        if (cookies != null) {
            for (Cookie cookie : cookies) {
                if (cookie.getName().equals(cookieName)) {
                    return true;
                }
            }
        }
        return false;
    }

    private boolean isHeaderExist(HttpServletRequest req, String headerName) {
        return req.getHeader(headerName) != null;
    }

    private void validateAuthHeaderExist(HttpServletRequest req) {
        boolean authHeader = isHeaderExist(req, HttpHeaders.AUTHORIZATION);
        if (!authHeader) throw new ByActionStatusComponentException(ActionStatus.AUTH_FAILED);
    }

    private boolean isUrlFromWhiteList(HttpServletRequest httpRequest) {
        String pathInfo;
        List<String> excludedUrls = authCookieConf.getExcludedUrls();
        pathInfo = httpRequest.getPathInfo().toLowerCase();
        log.debug("SessionValidationFilter: white list validation ->  PathInfo: {} ", pathInfo);
        Stream<String> stream = excludedUrls.stream();
        pathInfo.getClass();
        return stream.anyMatch(pathInfo::matches);
    }

    private Boolean isConsumerBusinessLogic() {
       return config.getConsumerBusinessLogic();
    }
    @Override
    public void destroy() {

    }
}