/*
 * @(#)SearchByInvoiceWidget.java
 *
 * Copyright 2010 Instituto Superior Tecnico
 * Founding Authors: Luis Cruz, Nuno Ochoa, Paulo Abrantes
 * 
 *      https://fenix-ashes.ist.utl.pt/
 * 
 *   This file is part of the Expenditure Tracking Module.
 *
 *   The Expenditure Tracking Module is free software: you can
 *   redistribute it and/or modify it under the terms of the GNU Lesser General
 *   Public License as published by the Free Software Foundation, either version 
 *   3 of the License, or (at your option) any later version.
 *
 *   The Expenditure Tracking Module 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with the Expenditure Tracking Module. If not, see <http://www.gnu.org/licenses/>.
 * 
 */
package pt.ist.expenditureTrackingSystem.presentationTier.widgets;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;

import module.dashBoard.presentationTier.DashBoardManagementAction;
import module.dashBoard.presentationTier.WidgetRequest;
import module.dashBoard.widgets.DashboardWidget;
import module.dashBoard.widgets.WidgetController;
import module.workflow.presentationTier.actions.ProcessManagement;

import org.apache.struts.action.ActionForward;
import org.fenixedu.bennu.core.i18n.BundleUtil;

import pt.ist.expenditureTrackingSystem.domain.acquisitions.PaymentProcess;
import pt.ist.expenditureTrackingSystem.domain.dto.SearchByInvoiceBean;
import pt.ist.expenditureTrackingSystem.domain.util.ExpenditureTrackingPanelPredicate;
import pt.ist.fenixWebFramework.renderers.components.state.IViewState;
import pt.ist.fenixWebFramework.renderers.model.MetaObject;
import pt.ist.fenixWebFramework.renderers.utils.RenderUtils;
import pt.ist.fenixWebFramework.servlets.filters.contentRewrite.GenericChecksumRewriter;

/**
 * 
 * @author Bruno Santos
 * 
 */
@DashboardWidget(nameBundle = "resources.ExpenditureResources", nameKey = "title.widget.searchByInvoice",
        aditionPredicate = ExpenditureTrackingPanelPredicate.class)
public class SearchByInvoiceWidget extends WidgetController {

    final public static String NOT_FOUND = "NF";
    final public static String SINGLE_FOUND = "SF";

    @Override
    public void doView(WidgetRequest request) {
        request.setAttribute("searchBean", new SearchByInvoiceBean());
    }

    @Override
    public ActionForward doSubmit(WidgetRequest request) {
        SearchByInvoiceBean searchBean = getRenderedObject("searchByInvoiceBean");
        List<PaymentProcess> processesFound = new ArrayList<PaymentProcess>();

        for (PaymentProcess process : searchBean.search()) {
            if (process.isAccessibleToCurrentUser()) {
                processesFound.add(process);
            }
        }

        try {
            String write = null;
            if (processesFound.size() == 0) {
                write = SearchByInvoiceWidget.NOT_FOUND;
            } else if (processesFound.size() == 1) {
                PaymentProcess process = processesFound.get(0);

                String url =
                        GenericChecksumRewriter.injectChecksumInUrl(request.getContextPath(),
                                ProcessManagement.workflowManagementURL + process.getExternalId(), null); // TODO !?! no session available.

                write = SearchByInvoiceWidget.SINGLE_FOUND + url;
            } else {
                request.setAttribute("multipleProcessesFound", processesFound);
                return DashBoardManagementAction.forwardToWidget(request);
            }

            HttpServletResponse response = request.getResponse();
            response.setContentType("text");
            ServletOutputStream stream = response.getOutputStream();

            response.setContentLength(write.length());
            stream.write(write.getBytes());
            stream.flush();
            stream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }

    protected <T extends Object> T getRenderedObject(final String id) {
        final IViewState viewState = RenderUtils.getViewState(id);
        return (T) getRenderedObject(viewState);
    }

    protected <T extends Object> T getRenderedObject(final IViewState viewState) {
        if (viewState != null) {
            MetaObject metaObject = viewState.getMetaObject();
            if (metaObject != null) {
                return (T) metaObject.getObject();
            }
        }
        return null;
    }

    @Override
    public String getWidgetDescription() {
        return BundleUtil.getString("resources/ExpenditureResources", "widget.description.SearchByInvoiceWidget");
    }
}