package org.bonitasoft.livingapps;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;

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

import org.bonitasoft.console.common.server.page.CustomPageRequestModifier;
import org.bonitasoft.console.common.server.page.PageRenderer;
import org.bonitasoft.console.common.server.page.ResourceRenderer;
import org.bonitasoft.console.common.server.utils.BonitaHomeFolderAccessor;
import org.bonitasoft.engine.api.TenantAPIAccessor;
import org.bonitasoft.engine.business.application.ApplicationPageNotFoundException;
import org.bonitasoft.engine.exception.BonitaException;
import org.bonitasoft.engine.exception.BonitaHomeNotSetException;
import org.bonitasoft.engine.exception.ServerAPIException;
import org.bonitasoft.engine.exception.UnknownAPITypeException;
import org.bonitasoft.engine.page.PageNotFoundException;
import org.bonitasoft.engine.session.APISession;
import org.bonitasoft.livingapps.exception.CreationException;

public class LivingApplicationServlet extends HttpServlet {

    private static final long serialVersionUID = -3911437607969651000L;

    /**
     * Logger
     */
    private static Logger LOGGER = Logger.getLogger(LivingApplicationServlet.class.getName());

    protected CustomPageRequestModifier customPageRequestModifier = new CustomPageRequestModifier();

    @Override
    protected void service(final HttpServletRequest hsRequest, final HttpServletResponse hsResponse)
            throws ServletException, IOException {

        final APISession session = getSession(hsRequest);

        // Check if requested URL is missing final slash (necessary in order to be able to use relative URLs for resources)
        if (isPageUrlWithoutFinalSlash(hsRequest)) {
            customPageRequestModifier.redirectToValidPageUrl(hsRequest, hsResponse);
            return;
        }

        try {
            createApplicationRouter(session).route(hsRequest, hsResponse, session, getPageRenderer(), getResourceRenderer(), new BonitaHomeFolderAccessor());
        } catch (final ApplicationPageNotFoundException | PageNotFoundException | CreationException e) {
            hsResponse.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage());
        } catch (final BonitaException | IllegalAccessException | InstantiationException e) {
            if (LOGGER.isLoggable(Level.WARNING)) {
                final String message = "Error while trying to display application " + hsRequest.getPathInfo();
                LOGGER.log(Level.WARNING, message, e);
            }
            hsResponse.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        }

    }

    ApplicationRouter createApplicationRouter(final APISession session) throws BonitaHomeNotSetException, ServerAPIException, UnknownAPITypeException {
        return new ApplicationRouter(new ApplicationModelFactory(
                TenantAPIAccessor.getLivingApplicationAPI(session),
                TenantAPIAccessor.getCustomPageAPI(session),
                TenantAPIAccessor.getProfileAPI(session)));
    }

    private boolean isPageUrlWithoutFinalSlash(final HttpServletRequest request) {
        return request.getPathInfo().matches("/[^/]+/[^/]+")
                ||request.getPathInfo().matches("/[^/]+");
    }

    APISession getSession(final HttpServletRequest hsRequest) {
        return (APISession) hsRequest.getSession().getAttribute("apiSession");
    }

    PageRenderer getPageRenderer(){
        return new PageRenderer(getResourceRenderer());
    }

    ResourceRenderer getResourceRenderer(){
        return new ResourceRenderer();
    }
}