<?php

/** @file */

namespace Code\Lib;

use App;


/**
 * A list of threads
 *
 */

class ThreadStream
{

    private $threads = [];
    private $mode = null;
    private $observer = null;
    private $writable = false;
    private $commentable = false;
    private $uploadable = false;
    private $profile_owner = 0;
    private $preview = false;
    private $prepared_item = '';
    public $reload = '';
    private $cipher = 'AES-128-CCM';

    // $prepared_item is for use by alternate conversation structures such as photos
    // wherein we've already prepared a top level item which doesn't look anything like
    // a normal "post" item

    public function __construct($mode, $preview, $uploadable, $prepared_item = '')
    {
        $this->set_mode($mode);
        $this->preview = $preview;
        $this->uploadable = $uploadable;
        $this->prepared_item = $prepared_item;
        $c = ((local_channel()) ? get_pconfig(local_channel(), 'system', 'default_cipher') : '');
        if ($c) {
            $this->cipher = $c;
        }
    }

    /**
     * Set the mode we'll be displayed on
     */
    private function set_mode($mode)
    {
        if ($this->get_mode() == $mode) {
            return;
        }

        $this->observer = App::get_observer();
        $ob_hash = (($this->observer) ? $this->observer['xchan_hash'] : '');

        switch ($mode) {
            case 'stream':
                $this->profile_owner = local_channel();
                $this->writable = true;
                break;
            case 'pubstream':
                $this->profile_owner = local_channel();
                $this->writable = ((local_channel()) ? true : false);
                break;
            case 'hq':
                $this->profile_owner = local_channel();
                $this->writable = true;
                break;
            case 'channel':
                $this->profile_owner = App::$profile['profile_uid'];
                $this->writable = perm_is_allowed($this->profile_owner, $ob_hash, 'post_comments');
                break;
            case 'cards':
                $this->profile_owner = App::$profile['profile_uid'];
                $this->writable = perm_is_allowed($this->profile_owner, $ob_hash, 'post_comments');
                $this->reload = $_SESSION['return_url'];
                break;
            case 'articles':
                $this->profile_owner = App::$profile['profile_uid'];
                $this->writable = perm_is_allowed($this->profile_owner, $ob_hash, 'post_comments');
                $this->reload = $_SESSION['return_url'];
                break;
            case 'display':
                // in this mode we set profile_owner after initialisation (from conversation()) and then
                // pull some trickery which allows us to re-invoke this function afterward
                // it's an ugly hack so @FIXME
                $this->writable = perm_is_allowed($this->profile_owner, $ob_hash, 'post_comments');
                $this->uploadable = perm_is_allowed($this->profile_owner, $ob_hash, 'write_storage');
                break;
            case 'page':
                $this->profile_owner = App::$profile['uid'];
                $this->writable = perm_is_allowed($this->profile_owner, $ob_hash, 'post_comments');
                break;
            default:
                logger('[ERROR] Conversation::set_mode : Unhandled mode (' . $mode . ').', LOGGER_DEBUG);
                return false;
                break;
        }
        $this->mode = $mode;
    }

    /**
     * Get mode
     */
    public function get_mode()
    {
        return $this->mode;
    }

    /**
     * Check if page is writable
     */
    public function is_writable()
    {
        return $this->writable;
    }

    public function is_commentable()
    {
        return $this->commentable;
    }

    public function is_uploadable()
    {
        return $this->uploadable;
    }


    /**
     * Check if page is a preview
     */
    public function is_preview()
    {
        return $this->preview;
    }

    /**
     * Get profile owner
     */
    public function get_profile_owner()
    {
        return $this->profile_owner;
    }

    public function set_profile_owner($uid)
    {
        $this->profile_owner = $uid;
        $mode = $this->get_mode();
        $this->mode = null;
        $this->set_mode($mode);
    }

    public function get_observer()
    {
        return $this->observer;
    }

    public function get_cipher()
    {
        return $this->cipher;
    }


    /**
     * Add a thread to the conversation
     *
     * Returns:
     *      _ The inserted item on success
     *      _ false on failure
     */
    public function add_thread($item)
    {
        $item_id = $item->get_id();
        if (!$item_id) {
            logger('Item has no ID!!', LOGGER_DEBUG, LOG_ERR);
            return false;
        }
        if ($this->get_thread($item->get_id())) {
            logger('Thread already exists (' . $item->get_id() . ').', LOGGER_DEBUG, LOG_WARNING);
            return false;
        }

        /*
         * Only add things that will be displayed
         */


        if (($item->get_data_value('id') != $item->get_data_value('parent')) && (activity_match($item->get_data_value('verb'), ACTIVITY_LIKE) || activity_match($item->get_data_value('verb'), ACTIVITY_DISLIKE))) {
            return false;
        }

        $item->set_commentable(false);
        $ob_hash = (($this->observer) ? $this->observer['xchan_hash'] : '');

        if (! comments_are_now_closed($item->get_data())) {
            if (($item->get_data_value('author_xchan') === $ob_hash) || ($item->get_data_value('owner_xchan') === $ob_hash)) {
                $item->set_commentable(true);
            }

            if (intval($item->get_data_value('item_nocomment'))) {
                $item->set_commentable(false);
            } elseif (! $item->is_commentable()) {
                if ((array_key_exists('owner', $item->data)) && intval($item->data['owner']['abook_self'])) {
                    $item->set_commentable(perm_is_allowed($this->profile_owner, $ob_hash, 'post_comments'));
                } else {
                    $item->set_commentable(can_comment_on_post($ob_hash, $item->data));
                }
            }
        }
        if ($this->mode === 'pubstream' && (! local_channel())) {
            $item->set_commentable(false);
        }


        $item->set_conversation($this);
        $this->threads[] = $item;
        return end($this->threads);
    }

    /**
     * Get data in a form usable by a conversation template
     *
     * We should find a way to avoid using those arguments (at least most of them)
     *
     * Returns:
     *      _ The data requested on success
     *      _ false on failure
     */
    public function get_template_data($conv_responses)
    {
        $result = [];

        foreach ($this->threads as $item) {
            if (($item->get_data_value('id') == $item->get_data_value('parent')) && $this->prepared_item) {
                $item_data = $this->prepared_item;
            } else {
                $item_data = $item->get_template_data($conv_responses);
            }
            if (!$item_data) {
                logger('Failed to get item template data (' . $item->get_id() . ').', LOGGER_DEBUG, LOG_ERR);
                return false;
            }
            $result[] = $item_data;
        }

        return $result;
    }

    /**
     * Get a thread based on its item id
     *
     * Returns:
     *      _ The found item on success
     *      _ false on failure
     */
    private function get_thread($id)
    {
        foreach ($this->threads as $item) {
            if ($item->get_id() == $id) {
                return $item;
            }
        }

        return false;
    }
}