<?php

namespace Model;

/**
 * Notification Filter model
 *
 * @package  model
 * @author   Frederic Guillot
 */
class NotificationFilter extends Base
{
    /**
     * SQL table name
     *
     * @var string
     */
    const PROJECT_TABLE = 'user_has_notifications';

    /**
     * User filters
     *
     * @var integer
     */
    const FILTER_NONE      = 1;
    const FILTER_ASSIGNEE  = 2;
    const FILTER_CREATOR   = 3;
    const FILTER_BOTH      = 4;

    /**
     * Get the list of filters
     *
     * @access public
     * @return array
     */
    public function getFilters()
    {
        return array(
            self::FILTER_NONE => t('All tasks'),
            self::FILTER_ASSIGNEE => t('Only for tasks assigned to me'),
            self::FILTER_CREATOR => t('Only for tasks created by me'),
            self::FILTER_BOTH => t('Only for tasks created by me and assigned to me'),
        );
    }

    /**
     * Get user selected filter
     *
     * @access public
     * @param  integer  $user_id
     * @return integer
     */
    public function getUserSelectedFilter($user_id)
    {
        return $this->db->table(User::TABLE)->eq('id', $user_id)->findOneColumn('notifications_filter');
    }

    /**
     * Save selected filter for a user
     *
     * @access public
     * @param  integer  $user_id
     * @param  string   $filter
     */
    public function saveUserFilter($user_id, $filter)
    {
        $this->db->table(User::TABLE)->eq('id', $user_id)->update(array(
            'notifications_filter' => $filter,
        ));
    }

    /**
     * Get user selected projects
     *
     * @access public
     * @param  integer  $user_id
     * @return array
     */
    public function getUserSelectedProjects($user_id)
    {
        return $this->db->table(self::PROJECT_TABLE)->eq('user_id', $user_id)->findAllByColumn('project_id');
    }

    /**
     * Save selected projects for a user
     *
     * @access public
     * @param  integer    $user_id
     * @param  integer[]  $project_ids
     */
    public function saveUserSelectedProjects($user_id, array $project_ids)
    {
        $this->db->table(self::PROJECT_TABLE)->eq('user_id', $user_id)->remove();

        foreach ($project_ids as $project_id) {
            $this->db->table(self::PROJECT_TABLE)->insert(array(
                'user_id' => $user_id,
                'project_id' => $project_id,
            ));
        }
    }

    /**
     * Return true if the user should receive notification
     *
     * @access public
     * @param  array  $user
     * @param  array  $event_data
     * @return boolean
     */
    public function shouldReceiveNotification(array $user, array $event_data)
    {
        $filters = array(
            'filterNone',
            'filterAssignee',
            'filterCreator',
            'filterBoth',
        );

        foreach ($filters as $filter) {
            if ($this->$filter($user, $event_data)) {
                return $this->filterProject($user, $event_data);
            }
        }

        return false;
    }

    /**
     * Return true if the user will receive all notifications
     *
     * @access public
     * @param  array  $user
     * @return boolean
     */
    public function filterNone(array $user)
    {
        return $user['notifications_filter'] == self::FILTER_NONE;
    }

    /**
     * Return true if the user is the assignee and selected the filter "assignee"
     *
     * @access public
     * @param  array  $user
     * @param  array  $event_data
     * @return boolean
     */
    public function filterAssignee(array $user, array $event_data)
    {
        return $user['notifications_filter'] == self::FILTER_ASSIGNEE && $event_data['task']['owner_id'] == $user['id'];
    }

    /**
     * Return true if the user is the creator and enabled the filter "creator"
     *
     * @access public
     * @param  array  $user
     * @param  array  $event_data
     * @return boolean
     */
    public function filterCreator(array $user, array $event_data)
    {
        return $user['notifications_filter'] == self::FILTER_CREATOR && $event_data['task']['creator_id'] == $user['id'];
    }

    /**
     * Return true if the user is the assignee or the creator and selected the filter "both"
     *
     * @access public
     * @param  array  $user
     * @param  array  $event_data
     * @return boolean
     */
    public function filterBoth(array $user, array $event_data)
    {
        return $user['notifications_filter'] == self::FILTER_BOTH &&
               ($event_data['task']['creator_id'] == $user['id'] || $event_data['task']['owner_id'] == $user['id']);
    }

    /**
     * Return true if the user want to receive notification for the selected project
     *
     * @access public
     * @param  array  $user
     * @param  array  $event_data
     * @return boolean
     */
    public function filterProject(array $user, array $event_data)
    {
        $projects = $this->getUserSelectedProjects($user['id']);

        if (! empty($projects)) {
            return in_array($event_data['task']['project_id'], $projects);
        }

        return true;
    }
}