/*
 * Copyright 2010 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.sample.expenses.client.place;

import com.google.gwt.http.client.URL;
import com.google.gwt.place.shared.Place;
import com.google.gwt.place.shared.PlaceTokenizer;
import com.google.gwt.place.shared.Prefix;
import com.google.gwt.sample.expenses.shared.EmployeeProxy;
import com.google.web.bindery.requestfactory.shared.EntityProxyId;
import com.google.web.bindery.requestfactory.shared.RequestFactory;

/**
 * A place in the app that shows a list of reports.
 */
public class ReportListPlace extends Place {

  /**
   * Tokenizer, which by all rights should have been code generated. Stay tuned.
   */
  @Prefix("l")
  public static class Tokenizer implements PlaceTokenizer<ReportListPlace> {
    static final String SEPARATOR = "!";
    private static final String NO_ID = "n";

    private final RequestFactory requests;

    public Tokenizer(RequestFactory requests) {
      this.requests = requests;
    }

    public ReportListPlace getPlace(String token) {
      String bits[] = token.split(SEPARATOR);

      if (bits.length != 2) {
        return null;
      }

      String department = URL.decodePathSegment(bits[0]);
      String reporterIdToken = bits[1];

      EntityProxyId<EmployeeProxy> proxyId = NO_ID.equals(reporterIdToken)
          ? null : requests.<EmployeeProxy> getProxyId(reporterIdToken);
      return new ReportListPlace(proxyId, department);
    }

    public String getToken(ReportListPlace place) {
      EntityProxyId<EmployeeProxy> id = place.getEmployeeId();
      String idToken = id == null ? NO_ID : requests.getHistoryToken(id);
      return URL.encodePathSegment(place.getDepartment()) + SEPARATOR + idToken;
    }
  }

  public static final ReportListPlace ALL = new ReportListPlace(null, "");

  private final EntityProxyId<EmployeeProxy> employeeId;
  private final String department;

  public ReportListPlace(EntityProxyId<EmployeeProxy> employeeId,
      String department) {
    this.employeeId = employeeId;
    this.department = department;
  }

  /**
   * @return the department searched for, or null for none
   */
  public String getDepartment() {
    return department;
  }

  /**
   * @return the employee to focus on, or null for none
   */
  public EntityProxyId<EmployeeProxy> getEmployeeId() {
    return employeeId;
  }
}