/*
 * Copyright 2012 LinkedIn Corp.
 * 
 * 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 azkaban.webapp.servlet;

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

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

import org.apache.log4j.Logger;

import azkaban.project.Project;
import azkaban.project.ProjectManager;
import azkaban.user.Permission;
import azkaban.user.Role;
import azkaban.user.User;
import azkaban.user.UserManager;
import azkaban.webapp.AzkabanWebServer;
import azkaban.webapp.session.Session;

/**
 * The main page
 */
public class ProjectServlet extends LoginAbstractAzkabanServlet {
  private static final Logger logger = Logger.getLogger(ProjectServlet.class
      .getName());
  private static final String LOCKDOWN_CREATE_PROJECTS_KEY =
      "lockdown.create.projects";
  private static final long serialVersionUID = -1;

  private UserManager userManager;

  private boolean lockdownCreateProjects = false;

  @Override
  public void init(ServletConfig config) throws ServletException {
    super.init(config);
    AzkabanWebServer server = (AzkabanWebServer) getApplication();

    userManager = server.getUserManager();
    lockdownCreateProjects =
        server.getServerProps().getBoolean(LOCKDOWN_CREATE_PROJECTS_KEY, false);
    if (lockdownCreateProjects) {
      logger.info("Creation of projects is locked down");
    }
  }

  @Override
  protected void handleGet(HttpServletRequest req, HttpServletResponse resp,
      Session session) throws ServletException, IOException {
    if (hasParam(req, "doaction")) {
      if (getParam(req, "doaction").equals("search")) {
        String searchTerm = getParam(req, "searchterm");
        if (!searchTerm.equals("") && !searchTerm.equals(".*")) {
          handleFilter(req, resp, session, searchTerm);
          return;
        }
      }
    }

    User user = session.getUser();

    ProjectManager manager =
        ((AzkabanWebServer) getApplication()).getProjectManager();
    Page page =
        newPage(req, resp, session, "azkaban/webapp/servlet/velocity/index.vm");

    if (lockdownCreateProjects && !hasPermissionToCreateProject(user)) {
      page.add("hideCreateProject", true);
    }

    if (hasParam(req, "all")) {
      List<Project> projects = manager.getProjects();
      page.add("viewProjects", "all");
      page.add("projects", projects);
    } else if (hasParam(req, "group")) {
      List<Project> projects = manager.getGroupProjects(user);
      page.add("viewProjects", "group");
      page.add("projects", projects);
    } else {
      List<Project> projects = manager.getUserProjects(user);
      page.add("viewProjects", "personal");
      page.add("projects", projects);
    }

    page.render();
  }

  private void handleFilter(HttpServletRequest req, HttpServletResponse resp,
      Session session, String searchTerm) {
    User user = session.getUser();
    ProjectManager manager =
        ((AzkabanWebServer) getApplication()).getProjectManager();
    Page page =
        newPage(req, resp, session, "azkaban/webapp/servlet/velocity/index.vm");
    if (hasParam(req, "all")) {
      // do nothing special if one asks for 'ALL' projects
      List<Project> projects = manager.getProjectsByRegex(searchTerm);
      page.add("allProjects", "");
      page.add("projects", projects);
      page.add("search_term", searchTerm);
    } else {
      List<Project> projects = manager.getUserProjectsByRegex(user, searchTerm);
      page.add("projects", projects);
      page.add("search_term", searchTerm);
    }

    page.render();
  }

  @Override
  protected void handlePost(HttpServletRequest req, HttpServletResponse resp,
      Session session) throws ServletException, IOException {
    // TODO Auto-generated method stub
  }

  private boolean hasPermissionToCreateProject(User user) {
    for (String roleName : user.getRoles()) {
      Role role = userManager.getRole(roleName);
      Permission perm = role.getPermission();
      if (perm.isPermissionSet(Permission.Type.ADMIN)
          || perm.isPermissionSet(Permission.Type.CREATEPROJECTS)) {
        return true;
      }
    }

    return false;
  }
}
