package org.activityinfo.server.endpoint.export;

/*
 * #%L
 * ActivityInfo Server
 * %%
 * Copyright (C) 2009 - 2013 UNICEF
 * %%
 * 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 (at your option) 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/gpl-3.0.html>.
 * #L%
 */

import com.google.inject.Inject;
import com.google.inject.Singleton;
import org.activityinfo.legacy.shared.command.GetUsers;
import org.activityinfo.legacy.shared.command.result.UserResult;
import org.activityinfo.server.command.DispatcherSync;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;

/**
 * Exports complete Users List to an Excel file
 *
 * @author Muhammad Abid
 */
@Singleton
public class ExportUsersServlet extends HttpServlet {

    private DispatcherSync dispatcher;

    @Inject
    public ExportUsersServlet(DispatcherSync dispatcher) {
        this.dispatcher = dispatcher;
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        int dbId = Integer.valueOf(req.getParameter("dbUsers"));

        try {

            UserResult userResult = dispatcher.execute(new GetUsers(dbId));

            DbUserExport export = new DbUserExport(userResult.getData());
            export.createSheet();

            resp.setContentType("application/vnd.ms-excel");
            if (req.getHeader("User-Agent").contains("MSIE")) {
                resp.addHeader("Content-Disposition", "attachment; filename=ActivityInfo.xls");
            } else {
                resp.addHeader("Content-Disposition",
                        "attachment; filename=" +
                        ("ActivityInfo Export " + new Date().toString() + ".xls").replace(" ", "_"));
            }

            OutputStream os = resp.getOutputStream();
            export.getBook().write(os);

        } catch (Exception e) {
            e.printStackTrace();
            resp.setStatus(500);
        }
    }
}