<?php
/*
 * StatusNet - the distributed open-source microblogging tool
 * Copyright (C) 2010, StatusNet, Inc.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

/**
 * Basic client class for Yammer's OAuth/JSON API.
 *
 * @package YammerImportPlugin
 * @author Brion Vibber <brion@status.net>
 */
class YammerImporter
{

    protected $users=array();
    protected $groups=array();
    protected $notices=array();

    /**
     * Load or create an imported profile from Yammer data.
     * 
     * @param object $item loaded JSON data for Yammer importer
     * @return Profile
     */
    function importUser($item)
    {
        $data = $this->prepUser($item);

        $profileId = $this->findImportedUser($data['orig_id']);
        if ($profileId) {
            return Profile::staticGet('id', $profileId);
        } else {
            $user = User::register($data['options']);
            // @fixme set avatar!
            $this->recordImportedUser($data['orig_id'], $user->id);
            return $user->getProfile();
        }
    }

    /**
     * Load or create an imported group from Yammer data.
     *
     * @param object $item loaded JSON data for Yammer importer
     * @return User_group
     */
    function importGroup($item)
    {
        $data = $this->prepGroup($item);

        $groupId = $this->findImportedGroup($data['orig_id']);
        if ($groupId) {
            return User_group::staticGet('id', $groupId);
        } else {
            $group = User_group::register($data['options']);
            // @fixme set avatar!
            $this->recordImportedGroup($data['orig_id'], $group->id);
            return $group;
        }
    }

    /**
     * Load or create an imported notice from Yammer data.
     *
     * @param object $item loaded JSON data for Yammer importer
     * @return Notice
     */
    function importNotice($item)
    {
        $data = $this->prepNotice($item);

        $noticeId = $this->findImportedNotice($data['orig_id']);
        if ($noticeId) {
            return Notice::staticGet('id', $noticeId);
        } else {
            $notice = Notice::saveNew($data['profile'],
                                      $data['content'],
                                      $data['source'],
                                      $data['options']);
            // @fixme attachments?
            $this->recordImportedNotice($data['orig_id'], $notice->id);
            return $notice;
        }
    }

    /**
     * Pull relevant info out of a Yammer data record for a user import.
     *
     * @param array $item
     * @return array
     */
    function prepUser($item)
    {
        if ($item['type'] != 'user') {
            throw new Exception('Wrong item type sent to Yammer user import processing.');
        }

        $origId = $item['id'];
        $origUrl = $item['url'];

        // @fixme check username rules?

        $options['nickname'] = $item['name'];
        $options['fullname'] = trim($item['full_name']);

        // We don't appear to have full bio avail here!
        $options['bio'] = $item['job_title'];

        // What about other data like emails?

        // Avatar... this will be the "_small" variant.
        // Remove that (pre-extension) suffix to get the orig-size image.
        $avatar = $item['mugshot_url'];

        // Warning: we don't have following state for other users?

        return array('orig_id' => $origId,
                     'orig_url' => $origUrl,
                     'avatar' => $avatar,
                     'options' => $options);

    }

    /**
     * Pull relevant info out of a Yammer data record for a group import.
     *
     * @param array $item
     * @return array
     */
    function prepGroup($item)
    {
        if ($item['type'] != 'group') {
            throw new Exception('Wrong item type sent to Yammer group import processing.');
        }

        $origId = $item['id'];
        $origUrl = $item['url'];

        $privacy = $item['privacy']; // Warning! only public groups in SN so far

        $options['nickname'] = $item['name'];
        $options['fullname'] = $item['full_name'];
        $options['created'] = $this->timestamp($item['created_at']);

        $avatar = $item['mugshot_url']; // as with user profiles...


        $options['mainpage'] = common_local_url('showgroup',
                                   array('nickname' => $options['nickname']));

        // @fixme what about admin user for the group?
        // bio? homepage etc? aliases?

        $options['local'] = true;
        return array('orig_id' => $origId,
                     'orig_url' => $origUrl,
                     'options' => $options);
    }

    /**
     * Pull relevant info out of a Yammer data record for a notice import.
     *
     * @param array $item
     * @return array
     */
    function prepNotice($item)
    {
        if (isset($item['type']) && $item['type'] != 'message') {
            throw new Exception('Wrong item type sent to Yammer message import processing.');
        }

        $origId = $item['id'];
        $origUrl = $item['url'];

        $profile = $this->findImportedUser($item['sender_id']);
        $content = $item['body']['plain'];
        $source = 'yammer';
        $options = array();

        if ($item['replied_to_id']) {
            $replyto = $this->findImportedNotice($item['replied_to_id']);
            if ($replyto) {
                $options['replyto'] = $replyto;
            }
        }
        $options['created'] = $this->timestamp($item['created_at']);

        // Parse/save rendered text?
        // Save liked info?
        // @todo attachments?

        return array('orig_id' => $origId,
                     'orig_url' => $origUrl,
                     'profile' => $profile,
                     'content' => $content,
                     'source' => $source,
                     'options' => $options);
    }

    private function findImportedUser($origId)
    {
        if (isset($this->users[$origId])) {
            return $this->users[$origId];
        } else {
            return false;
        }
    }

    private function findImportedGroup($origId)
    {
        if (isset($this->groups[$origId])) {
            return $this->groups[$origId];
        } else {
            return false;
        }
    }

    private function findImportedNotice($origId)
    {
        if (isset($this->notices[$origId])) {
            return $this->notices[$origId];
        } else {
            return false;
        }
    }

    private function recordImportedUser($origId, $userId)
    {
        $this->users[$origId] = $userId;
    }

    private function recordImportedGroup($origId, $groupId)
    {
        $this->groups[$origId] = $groupId;
    }

    private function recordImportedNotice($origId, $noticeId)
    {
        $this->notices[$origId] = $noticeId;
    }

    /**
     * Normalize timestamp format.
     * @param string $ts
     * @return string
     */
    private function timestamp($ts)
    {
        return common_sql_date(strtotime($ts));
    }
}