/*
 * eGov suite of products aim to improve the internal efficiency,transparency,
 *    accountability and the service delivery of the government  organizations.
 *
 *     Copyright (C) <2015>  eGovernments Foundation
 *
 *     The updated version of eGov suite of products as by eGovernments Foundation
 *     is available at http://www.egovernments.org
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program. If not, see http://www.gnu.org/licenses/ or
 *     http://www.gnu.org/licenses/gpl.html .
 *
 *     In addition to the terms of the GPL license to be adhered to in using this
 *     program, the following additional terms are to be complied with:
 *
 *         1) All versions of this program, verbatim or modified must carry this
 *            Legal Notice.
 *
 *         2) Any misrepresentation of the origin of the material is prohibited. It
 *            is required that all modified versions of this material be marked in
 *            reasonable ways as different from the original version.
 *
 *         3) This license does not grant any rights to any user of the program
 *            with regards to rights under trademark law for use of the trade names
 *            or trademarks of eGovernments Foundation.
 *
 *   In case of any queries, you can reach eGovernments Foundation at contact@egovernments.org.
 */

package org.egov.infra.web.filter;

import org.egov.infra.admin.master.service.CityService;
import org.egov.infra.config.core.ApplicationThreadLocals;
import org.egov.infra.config.properties.ApplicationProperties;
import org.springframework.beans.factory.annotation.Autowired;

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.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.io.IOException;

import static org.egov.infra.utils.ApplicationConstant.CDN_ATTRIB_NAME;
import static org.egov.infra.utils.ApplicationConstant.CITY_CODE_KEY;
import static org.egov.infra.utils.ApplicationConstant.CITY_CORP_NAME_KEY;
import static org.egov.infra.utils.ApplicationConstant.CITY_NAME_KEY;
import static org.egov.infra.utils.ApplicationConstant.USERID_KEY;

public class ApplicationCoreFilter implements Filter {

    @Autowired
    private CityService cityService;

    @Autowired
    private ApplicationProperties applicationProperties;

    @Override
    public void doFilter(final ServletRequest req, final ServletResponse resp, final FilterChain chain) throws IOException, ServletException {
        final HttpServletRequest request = (HttpServletRequest) req;
        final HttpSession session = request.getSession();
        try {
            prepareCityPreferences(session);
            prepareThreadLocal(session);
            chain.doFilter(request, resp);
        } finally {
            ApplicationThreadLocals.clearValues();
        }
    }

    private void prepareCityPreferences(final HttpSession session) {
        if (session.getAttribute(CITY_CODE_KEY) == null)
            cityService.cityDataAsMap().forEach((k, v) -> {
                session.setAttribute(k, v);
            });
    }

    private void prepareThreadLocal(final HttpSession session) {
        ApplicationThreadLocals.setCityCode((String) session.getAttribute(CITY_CODE_KEY));
        ApplicationThreadLocals.setCityName((String) session.getAttribute(CITY_NAME_KEY));
        ApplicationThreadLocals.setMunicipalityName((String) session.getAttribute(CITY_CORP_NAME_KEY));
        if (session.getAttribute(USERID_KEY) != null)
            ApplicationThreadLocals.setUserId((Long) session.getAttribute(USERID_KEY));
        if(session.getServletContext().getAttribute(CDN_ATTRIB_NAME) == null)
            session.getServletContext().setAttribute(CDN_ATTRIB_NAME,applicationProperties.getProperty("cdn.domain.url"));
    }

    @Override
    public void destroy() {
    }

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