/*
 * Copyright (C) 2005-2010 Alfresco Software Limited.
 *
 * This file is part of Alfresco
 *
 * Alfresco is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Alfresco 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
 */
package org.alfresco.repo.invitation.site;

import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.alfresco.repo.invitation.WorkflowModelNominatedInvitation;
import org.alfresco.repo.security.authentication.AuthenticationUtil;
import org.alfresco.repo.security.authentication.MutableAuthenticationDao;
import org.alfresco.repo.security.authentication.AuthenticationUtil.RunAsWork;
import org.alfresco.repo.template.TemplateNode;
import org.alfresco.service.ServiceRegistry;
import org.alfresco.service.cmr.repository.NodeRef;
import org.alfresco.service.cmr.security.PersonService;
import org.alfresco.service.cmr.site.SiteInfo;
import org.alfresco.service.cmr.site.SiteService;
import org.alfresco.service.cmr.workflow.WorkflowService;
import org.alfresco.service.cmr.workflow.WorkflowTask;
import org.alfresco.service.cmr.workflow.WorkflowTaskQuery;
import org.alfresco.service.cmr.workflow.WorkflowTaskState;
import org.alfresco.service.namespace.NamespaceService;
import org.alfresco.service.namespace.QName;

/**
 * Helper class to house utility methods common to 
 * more than one Invite Service Web Script 
 */
public class InviteHelper
{   
    /**
     * Find an invite start task by the given task id.
     * 
     * @return a WorkflowTask or null if not found.
     */
    public static WorkflowTask findInviteStartTask(String inviteId, WorkflowService workflowService)
    {
        // create workflow task query
        WorkflowTaskQuery wfTaskQuery = new WorkflowTaskQuery();
        
        wfTaskQuery.setProcessId(inviteId);
        
        // set process name to "wf:invite" so that only tasks associated with
        // invite workflow instances are returned by query
        wfTaskQuery.setProcessName(WorkflowModelNominatedInvitation.WF_PROCESS_INVITE);

        // filter to find only the invite start task
        wfTaskQuery.setTaskState(WorkflowTaskState.COMPLETED);
        wfTaskQuery.setTaskName(WorkflowModelNominatedInvitation.WF_INVITE_TASK_INVITE_TO_SITE);

        // query for invite workflow task associate
        List<WorkflowTask> inviteStartTasks = workflowService
                .queryTasks(wfTaskQuery);

        // should also be 0 or 1
        if (inviteStartTasks.size() < 1)
        {
            return null;
        }
        else
        {
            return inviteStartTasks.get(0);
        }
    }
    
    /**
     * Find invitePending tasks (in-progress) by the given invitee user name
     * 
     * @return a list of workflow tasks
     */
    public static List<WorkflowTask> findInvitePendingTasks(String inviteeUserName, WorkflowService workflowService)
    {
            // create workflow task query
            WorkflowTaskQuery wfTaskQuery = new WorkflowTaskQuery();
            
            // set process name to "wf:invite" so that only tasks associated with
            // invite workflow instances are returned by query
            wfTaskQuery.setProcessName(WorkflowModelNominatedInvitation.WF_PROCESS_INVITE);
            
            // set query to only pick up invite workflow instances
            // associated with the given invitee user name
            Map<QName, Object> processCustomProps = new HashMap<QName, Object>(1, 1.0f);
            processCustomProps.put(WorkflowModelNominatedInvitation.WF_PROP_INVITEE_USER_NAME, inviteeUserName);
            wfTaskQuery.setProcessCustomProps(processCustomProps);

            // set query to only pick up in-progress invite pending tasks 
            wfTaskQuery.setTaskState(WorkflowTaskState.IN_PROGRESS);
            wfTaskQuery.setTaskName(WorkflowModelNominatedInvitation.WF_INVITE_TASK_INVITE_PENDING);

            // query for invite workflow task associate
            List<WorkflowTask> inviteStartTasks = workflowService
                    .queryTasks(wfTaskQuery);

            return inviteStartTasks;
    }
    
    /**
     * Returns an InviteInfo instance for the given startInvite task
     * (used for rendering the response).
     * 
     * @param startInviteTask startInvite task to get invite info properties from
     * @param serviceRegistry service registry instance
     * @param siteService site service instance
     * 
     * @return InviteInfo instance containing invite information
     */
    public static InviteInfo getPendingInviteInfo(final WorkflowTask startInviteTask,
            final ServiceRegistry serviceRegistry, final SiteService siteService)
    {
        final PersonService personService = serviceRegistry.getPersonService();
        
        // get the inviter, invitee, role and site short name
        final String inviterUserNameProp = (String) startInviteTask.properties.get(
                WorkflowModelNominatedInvitation.WF_PROP_INVITER_USER_NAME);
        final String inviteeUserNameProp = (String) startInviteTask.properties.get(
                WorkflowModelNominatedInvitation.WF_PROP_INVITEE_USER_NAME);
        final String role = (String) startInviteTask.properties.get(
                WorkflowModelNominatedInvitation.WF_PROP_INVITEE_ROLE);
        final String siteShortNameProp = (String) startInviteTask.properties.get(
                WorkflowModelNominatedInvitation.WF_PROP_RESOURCE_NAME);

        // get the site info
        SiteInfo siteInfo = siteService.getSite(siteShortNameProp);
        
        // get workflow instance id (associated with workflow task) to place
        // as "inviteId" onto model
        String workflowId = startInviteTask.path.instance.id;

        // set the invite start date to the time the workflow instance
        // (associated with the task) was started
        Date sentInviteDate = startInviteTask.path.instance.startDate;
        
        // TODO: glen johnson at alfresco com - as this web script only returns
        // pending invites, this is hard coded to "pending" for now
        String invitationStatus = InviteInfo.INVITATION_STATUS_PENDING;
        
        // fetch the person node for the inviter
        NodeRef inviterRef = personService.getPerson(inviterUserNameProp);
        TemplateNode inviterPerson = null;
        if (inviterRef != null)
        {
            inviterPerson = new TemplateNode(inviterRef, serviceRegistry, null); 
            //inviterPerson = new ScriptNode(inviterRef, serviceRegistry); 
        }
        
        // fetch the person node for the invitee
        NodeRef inviteeRef = personService.getPerson(inviteeUserNameProp);
        TemplateNode inviteePerson = null;
        if (inviteeRef != null)
        {
        	inviteePerson = new TemplateNode(inviteeRef, serviceRegistry, null);
            //inviteePerson = new ScriptNode(inviteeRef, serviceRegistry); 
        }
        
        // create and return a invite info
        InviteInfo inviteInfo = new InviteInfo(invitationStatus, inviterUserNameProp, inviterPerson,
                inviteeUserNameProp, inviteePerson, role, siteShortNameProp, siteInfo, sentInviteDate, workflowId);

        return inviteInfo;
    }
    
    /**
     * Clean up invitee user account and person node when no longer in use.
     * They are deemed to no longer be in use when the invitee user account
     * is still disabled and there are no outstanding pending invites for that invitee.
     * 
     * @param inviteeUserName
     * @param authenticationDao
     * @param personService
     * @param workflowService
     */
    public static void cleanUpStaleInviteeResources(final String inviteeUserName,
            final MutableAuthenticationDao authenticationDao, final PersonService personService,
            final WorkflowService workflowService)
    {
        AuthenticationUtil.runAs(new RunAsWork<Object>()
        {
            public Object doWork() throws Exception
            {
                // see if there are any pending invites (invite workflow instances with invitePending task in-progress)
                // outstanding for given invitee user name
                List<WorkflowTask> pendingTasks = InviteHelper.findInvitePendingTasks(inviteeUserName, workflowService);
                boolean invitesPending = (pendingTasks != null) && (pendingTasks.size() > 0);
                
                // if invitee's user account is still disabled and there are no pending invites outstanding
                // for the invitee, then remove the account and delete the invitee's person node
                if ((authenticationDao.userExists(inviteeUserName))
                        && (authenticationDao.getEnabled(inviteeUserName) == false)
                        && (invitesPending == false))
                {
                    // delete the invitee's user account
                    authenticationDao.deleteUser(inviteeUserName);
                    
                    // delete the invitee's person node if one exists
                    if (personService.personExists(inviteeUserName))
                    {
                        personService.deletePerson(inviteeUserName);
                    }
                }

                return null;
            }
        }, AuthenticationUtil.getSystemUserName());
    }
    
    /**
     * Complete the specified Invite Workflow Task for the invite workflow 
     * instance associated with the given invite ID, and follow the given
     * transition upon completing the task
     * 
     * @param inviteId the invite ID of the invite workflow instance for which
     *          we want to complete the given task
     * @param fullTaskName qualified name of invite workflow task to complete
     * @param transitionId the task transition to take on completion of 
     *          the task (or null, for the default transition)
     */
    public static void completeInviteTask(String inviteId, QName fullTaskName, String transitionId,
            final WorkflowService workflowService)
    {
        // create workflow task query
        WorkflowTaskQuery wfTaskQuery = new WorkflowTaskQuery();
        
        // set the given invite ID as the workflow process ID in the workflow query
        wfTaskQuery.setProcessId(inviteId);

        // find incomplete invite workflow tasks with given task name 
        wfTaskQuery.setActive(Boolean.TRUE);
        wfTaskQuery.setTaskState(WorkflowTaskState.IN_PROGRESS);
        wfTaskQuery.setTaskName(fullTaskName);

        // set process name to "wf:invite" so that only
        // invite workflow instances are considered by this query
        wfTaskQuery.setProcessName(WorkflowModelNominatedInvitation.WF_PROCESS_INVITE);

        // query for invite workflow tasks with the constructed query
        List<WorkflowTask> wf_invite_tasks = workflowService
                .queryTasks(wfTaskQuery);
        
        
        // end all tasks found with this name 
        for (WorkflowTask workflowTask : wf_invite_tasks)
        {
            workflowService.endTask(workflowTask.id, transitionId);
        }
    }
}