package fi.otavanopisto.pyramus.views.reports;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashSet;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

import org.apache.commons.lang3.StringUtils;

import fi.internetix.smvc.SmvcRuntimeException;
import fi.internetix.smvc.controllers.PageRequestContext;
import fi.otavanopisto.pyramus.I18N.Messages;
import fi.otavanopisto.pyramus.breadcrumbs.Breadcrumbable;
import fi.otavanopisto.pyramus.dao.DAOFactory;
import fi.otavanopisto.pyramus.dao.base.MagicKeyDAO;
import fi.otavanopisto.pyramus.domainmodel.base.MagicKey;
import fi.otavanopisto.pyramus.domainmodel.base.MagicKeyScope;
import fi.otavanopisto.pyramus.domainmodel.users.Role;
import fi.otavanopisto.pyramus.framework.PyramusViewController;
import fi.otavanopisto.pyramus.framework.UserRole;
import fi.otavanopisto.pyramus.util.ReportUtils;

/**
 * The controller responsible of the List Reports view.
 */
public class ViewReportContentsViewController extends PyramusViewController implements Breadcrumbable {
  
  /**
   * Processes the page request by including the corresponding JSP page to the response.
   * 
   * @param pageRequestContext Page request context
   */
  public void process(PageRequestContext pageRequestContext) {
    MagicKeyDAO magicKeyDAO = DAOFactory.getInstance().getMagicKeyDAO();

    Long reportId = pageRequestContext.getLong("reportId");
    String outputMethod = "preview"; // output or preview
    
    StringBuilder magicKeyBuilder = new StringBuilder()
      .append(Long.toHexString(reportId))
      .append('-')
      .append(Long.toHexString(System.currentTimeMillis()))
      .append('-')
      .append(Long.toHexString(Thread.currentThread().getId()));
    
    MagicKey magicKey = magicKeyDAO.create(magicKeyBuilder.toString(), MagicKeyScope.REQUEST); 
    
    String localeAdd = "";
    Locale locale = pageRequestContext.getRequest().getLocale();
    if (locale != null) {
      localeAdd = "&__locale=";
      localeAdd += locale.getLanguage();

      if (!StringUtils.isEmpty(locale.getCountry())) {
        localeAdd += "_";
        localeAdd += locale.getCountry();
      }
    }
    
    StringBuilder urlBuilder = new StringBuilder()
      .append(ReportUtils.getReportsUrl(pageRequestContext.getRequest()))
      .append("/")
      .append(outputMethod)
      .append("?magicKey=")
      .append(magicKey.getName())
      .append(localeAdd)
      .append("&__report=reports/")
      .append(reportId)
      .append(".rptdesign");
    
    // TODO: Report locale is wrong.
    
    Map<String, String[]> parameterMap = pageRequestContext.getRequest().getParameterMap();
    for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
      if (!reservedParameters.contains(entry.getKey())) {
        String[] values = entry.getValue();
        for (String value : values) {
          // TODO ISO-8859-1 should be UTF-8, once Birt's parameter dialog form has its accept-charset="UTF-8" set 
          try {
            urlBuilder.append('&').append(entry.getKey()).append('=').append(URLEncoder.encode(value, "ISO-8859-1"));
          }
          catch (UnsupportedEncodingException e) {
            throw new SmvcRuntimeException(e);
          }
        }
      }
    }
    
    pageRequestContext.setIncludeUrl(urlBuilder.toString());
  }

  /**
   * Returns the roles allowed to access this page. Reports are available for users with
   * {@link Role#USER}, {@link Role#MANAGER} and {@link Role#ADMINISTRATOR} privileges.
   * 
   * @return The roles allowed to access this page
   */
  public UserRole[] getAllowedRoles() {
    return new UserRole[] { UserRole.USER, UserRole.MANAGER, UserRole.STUDY_PROGRAMME_LEADER, UserRole.ADMINISTRATOR };
  }

  /**
   * Returns the localized name of this page. Used e.g. for breadcrumb navigation.
   * 
   * @param locale The locale to be used for the name
   * 
   * @return The localized name of this page
   */
  public String getName(Locale locale) {
    return Messages.getInstance().getText(locale, "reports.viewReport.pageTitle");
  }

  private static Set<String> reservedParameters = new HashSet<>();
  
  static {
    reservedParameters.add("reportId");
    reservedParameters.add("magicKey");
    reservedParameters.add("__report");
  }

}