/*
 * Copyright (C) 2003-2010 eXo Platform SAS.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Affero 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/>.
 */
package org.exoplatform.social.webui;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.ResourceBundle;
import java.util.Set;

import org.apache.commons.lang.StringEscapeUtils;
import org.exoplatform.webui.core.UIPortletApplication;

import org.apache.commons.lang.ArrayUtils;
import org.apache.commons.lang.StringUtils;
import org.exoplatform.commons.utils.ListAccess;
import org.exoplatform.container.ExoContainer;
import org.exoplatform.container.ExoContainerContext;
import org.exoplatform.container.PortalContainer;
import org.exoplatform.portal.config.UserACL;
import org.exoplatform.services.organization.OrganizationService;
import org.exoplatform.services.organization.User;
import org.exoplatform.social.core.identity.SpaceMemberFilterListAccess.Type;
import org.exoplatform.social.core.identity.model.Identity;
import org.exoplatform.social.core.identity.provider.OrganizationIdentityProvider;
import org.exoplatform.social.core.manager.IdentityManager;
import org.exoplatform.social.core.profile.ProfileFilter;
import org.exoplatform.social.core.space.model.Space;
import org.exoplatform.social.core.space.spi.SpaceService;
import org.exoplatform.web.application.ApplicationMessage;
import org.exoplatform.web.application.RequestContext;
import org.exoplatform.webui.application.WebuiRequestContext;
import org.exoplatform.webui.config.annotation.ComponentConfig;
import org.exoplatform.webui.config.annotation.EventConfig;
import org.exoplatform.webui.core.lifecycle.UIFormLifecycle;
import org.exoplatform.webui.event.Event;
import org.exoplatform.webui.event.EventListener;
import org.exoplatform.webui.form.UIForm;
import org.exoplatform.webui.form.UIFormStringInput;

@ComponentConfig(
  lifecycle = UIFormLifecycle.class,
  template = "war:/groovy/social/webui/UIUserInvitation.gtmpl",
  events = {
      @EventConfig(listeners = UIUserInvitation.InviteActionListener.class)
  }
)
public class UIUserInvitation extends UIForm {
  private static final String USER = "user";
  private SpaceService spaceService;
  private String spaceUrl;
  private ApplicationMessage msg;

  private static final String SPACE_PREFIX = "space::";

  public UIUserInvitation() throws Exception {
    addUIFormInput(new UIFormStringInput(USER, null, null));
    spaceUrl = org.exoplatform.social.core.space.SpaceUtils.getSpaceUrlByContext();
  }

  /**
   * Gets spaceService
   *
   * @return spaceService
   * @see SpaceService
   */
  private SpaceService getSpaceService() {
    if (spaceService == null) {
      spaceService = getApplicationComponent(SpaceService.class);
    }
    return spaceService;
  }

  public String getRestURL() {
    StringBuilder builder = new StringBuilder();
    builder.append("/").append(PortalContainer.getCurrentRestContextName()).append("/social/people/suggest.json?");
    builder.append("currentUser=").append(RequestContext.getCurrentInstance().getRemoteUser());
    builder.append("&spaceURL=").append(spaceUrl);
    builder.append("&typeOfRelation=").append("user_to_invite");
    return builder.toString();
  }

  public void addMessage(ApplicationMessage msg) {
    if (msg != null) {
      ResourceBundle rb = WebuiRequestContext.getCurrentInstance().getApplicationResourceBundle();
      msg.setResourceBundle(rb);
    }
    this.msg = msg;
  }

  public ApplicationMessage getMessage() {
    return this.msg;
  }

  public String getValue() {
    return getUIStringInput(USER).getValue();
  }

  /**
   * Validates invited users for checking if any error happens.
   *
   * @throws Exception
   */
  private String validateInvitedUser(String userNameForInvite) throws Exception {
    String[] invitedUserList = userNameForInvite.split(",");
    String invitedUser = null;
    String invitedUserNames = null;
    Set<String> validUsers = new HashSet<String>();
    Set<String> notExistUsers = new HashSet<String>();
    SpaceService spaceService = getSpaceService();

    boolean isValidInput = true;
    for (String userStr : invitedUserList) {
      // If it's a space
      if (userStr.startsWith(SPACE_PREFIX)) {
        String spaceName = userStr.substring(SPACE_PREFIX.length());
        Space space = spaceService.getSpaceByPrettyName(spaceName);
        if (space == null) {
          notExistUsers.add(spaceName);
          isValidInput = false;
        } else if (isValidInput == true) {
          ProfileFilter filter = new ProfileFilter();
          ListAccess<Identity> loader = Utils.getIdentityManager().getSpaceIdentityByProfileFilter(space, filter, Type.MEMBER, true);
          Identity[] identities = loader.load(0, loader.getSize());
          for (Identity i : identities) {
            invitedUser = i.getRemoteId();
            validUsers.add(invitedUser);
          }
        }
      } else { // Otherwise, it's an user
        invitedUser = userStr.trim();
        
        if (invitedUser.length() == 0) {
          continue;
        }
        
        if (isNotExisted(invitedUser)){
          notExistUsers.add(invitedUser);
          isValidInput = false;
        } else if (isValidInput == true) {
          validUsers.add(invitedUser);
        }
      }
    }
    
    if (notExistUsers.size() > 0) {
      StringBuilder sb = new StringBuilder();
      boolean isSeparated = false;
      for (String i : notExistUsers) {
        if (isSeparated) {
          sb.append(", ");
        }
        sb.append("'").append(i).append("'");
        isSeparated = true;
      }
      getAncestorOfType(UIPortletApplication.class)
          .addMessage(new ApplicationMessage("UIUserInvitation.msg.invalid-input", 
                                          new String[]{sb.toString()},
                                          ApplicationMessage.ERROR));
      return null;
    } else {
      if (validUsers.size() > 0) {
        invitedUserNames = StringUtils.join(validUsers, ',');
      }
    }

    return invitedUserNames;
  }

  protected boolean isMember(String userId) {
    Space space = org.exoplatform.social.webui.Utils.getSpaceByContext();
    try {
      if (ArrayUtils.contains(space.getMembers(), userId)) {
        return true;
      }
    } catch (Exception e) {
      return false;
    }
    return false;
  }
  
  private boolean hasInvited(String userId) {
    SpaceService spaceService = getSpaceService();
    Space space = org.exoplatform.social.webui.Utils.getSpaceByContext();
    try {
      if (spaceService.isInvitedUser(space, userId) || spaceService.isMember(space, userId)) {
        return true;
      }
    } catch (Exception e) {
      return false;
    }
    return false;
  }
  
  private boolean isNotExisted(String userId) {
    OrganizationService orgService = getApplicationComponent(OrganizationService.class);
    try {
      User user = orgService.getUserHandler().findUserByName(userId);
      
      if (user != null) {
        return false;
      }
    } catch (Exception e) {
      return true;
    }
    return true;
  }

  static public class InviteActionListener extends EventListener<UIUserInvitation> {
    public void execute(Event<UIUserInvitation> event) throws Exception {
      UIUserInvitation uicomponent = event.getSource();
      UIFormStringInput input = uicomponent.getUIStringInput(USER);
      String value = input.getValue();
      if (value == null || value.trim().isEmpty()) {
          uicomponent.getAncestorOfType(UIPortletApplication.class)
                   .addMessage(
                           new ApplicationMessage("UIUserInvitation.msg.empty-input", null));
        return;
      }

      SpaceService spaceService = uicomponent.getApplicationComponent(SpaceService.class);
      String invitedUserNames = uicomponent.validateInvitedUser(value);
      Space space = org.exoplatform.social.webui.Utils.getSpaceByContext();
      
      if (invitedUserNames != null) {
        String[] invitedUsers = invitedUserNames.split(",");
        String name = null;
        List<String> usersForInviting = new ArrayList<String>();
        if (invitedUsers != null) {
          for (int idx = 0; idx < invitedUsers.length; idx++) {
            name = invitedUsers[idx].trim();
            if (name.length() > 0) {
              if (!usersForInviting.contains(name) && !spaceService.isMember(space, name)) {
                usersForInviting.add(name);
              }
            }
          }
        }

        if (usersForInviting.size() > 0) {
          ExoContainer container = ExoContainerContext.getCurrentContainer();
          IdentityManager idm = (IdentityManager) container.getComponentInstanceOfType(IdentityManager.class);
          for (String userName : usersForInviting) {
            // create Identity and Profile nodes if not exist
            Identity identity = idm.getOrCreateIdentity(OrganizationIdentityProvider.NAME, userName, false);
            if (identity != null) {
              // add userName to InvitedUser list of the space
              spaceService.addInvitedUser(space, userName);
            }
          }

          if (usersForInviting.size() == 1) {
            Identity identity = idm.getOrCreateIdentity(OrganizationIdentityProvider.NAME, usersForInviting.get(0), true);
            uicomponent.addMessage(new ApplicationMessage("UIUserInvitation.msg.user-invited", new String[]{StringEscapeUtils.escapeHtml(identity.getProfile().getFullName())}));
          } else {
            uicomponent.addMessage(new ApplicationMessage("UIUserInvitation.msg.users-invited", new String[]{String.valueOf(usersForInviting.size())}));
          }
        } else {
          if (invitedUsers.length == 1) {
            uicomponent.addMessage(new ApplicationMessage("UIUserInvitation.msg.user-is-member", new String[]{invitedUsers[0]}));
          } else {
            uicomponent.addMessage(new ApplicationMessage("UIUserInvitation.msg.users-already-members", null));
          }
        }

        input.setValue(StringUtils.EMPTY);
      }
    }
  }
}
