<?php

declare(strict_types = 1);

// {{{ License

// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social 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.
//
// GNU social 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 GNU social.  If not, see <http://www.gnu.org/licenses/>.

// }}}

namespace Component\Conversation;

use App\Core\Cache;
use App\Core\DB\DB;
use App\Core\Event;
use function App\Core\I18n\_m;
use App\Core\Modules\Component;
use App\Core\Router\RouteLoader;
use App\Core\Router\Router;
use App\Entity\Actor;
use App\Entity\Note;
use App\Util\Common;
use App\Util\Formatting;
use Component\Conversation\Controller\Reply as ReplyController;
use Component\Conversation\Entity\Conversation as ConversationEntity;
use Symfony\Component\HttpFoundation\Request;

class Conversation extends Component
{
    /**
     * **Assigns** the given local Note it's corresponding **Conversation**
     *
     * **If a _$parent_id_ is not given**, then the Actor is not attempting a reply,
     * therefore, we can assume (for now) that we need to create a new Conversation and assign it
     * to the newly created Note (please look at Component\Posting::storeLocalNote, where this function is used)
     *
     * **On the other hand**, given a _$parent_id_, the Actor is attempting to post a reply. Meaning that,
     * this Note conversation_id should be same as the parent Note
     */
    public static function assignLocalConversation(Note $current_note, ?int $parent_id): void
    {
        if (!$parent_id) {
            // If none found, we don't know yet if it is a reply or root
            // Let's assume for now that it's a new conversation and deal with stitching later
            $conversation = ConversationEntity::create(['initial_note_id' => $current_note->getId()]);

            // We need the Conversation id itself, so a persist is in order
            DB::persist($conversation);

            // Set current_note's own conversation_id
            $current_note->setConversationId($conversation->getId());
        } else {
            // It's a reply for sure
            // Set reply_to property in newly created Note to parent's id
            $current_note->setReplyTo($parent_id);

            // Parent will have a conversation of its own, the reply should have the same one
            $parent_note = Note::getById($parent_id);
            $current_note->setConversationId($parent_note->getConversationId());
        }

        DB::merge($current_note);
    }

    /**
     * HTML rendering event that adds a reply link as a note
     * action, if a user is logged in
     */
    public function onAddNoteActions(Request $request, Note $note, array &$actions): bool
    {
        if (\is_null(Common::user())) {
            return Event::next;
        }

        // Generating URL for reply action route
        $args             = ['note_id' => $note->getId(), 'actor_id' => $note->getActor()->getId()];
        $type             = Router::ABSOLUTE_PATH;
        $reply_action_url = Router::url('reply_add', $args, $type);

        $query_string = $request->getQueryString();
        // Concatenating get parameter to redirect the user to where he came from
        $reply_action_url .= '?from=' . urlencode($request->getRequestUri());

        $reply_action = [
            'url'     => $reply_action_url,
            'title'   => _m('Reply to this note!'),
            'classes' => 'button-container reply-button-container note-actions-unset',
            'id'      => 'reply-button-container-' . $note->getId(),
        ];

        $actions[] = $reply_action;
        return Event::next;
    }

    public function onAddExtraArgsToNoteContent(Request $request, Actor $actor, array $data, array &$extra_args): bool
    {
        // If Actor is adding a reply, get parent's Note id
        // Else it's null
        $extra_args['reply_to'] = $request->get('_route') === 'reply_add' ? (int) $request->get('note_id') : null;
        return Event::next;
    }

    /**
     * Append on note information about user actions
     */
    public function onAppendCardNote(array $vars, array &$result): bool
    {
        // if note is the original, append on end "user replied to this"
        // if note is the reply itself: append on end "in response to user in conversation"
        $check_user = !\is_null(Common::user());
        $note       = $vars['note'];

        $complementary_info = '';
        $reply_actor        = [];
        $note_replies       = $note->getReplies();

        // Get actors who replied
        foreach ($note_replies as $reply) {
            $reply_actor[] = Actor::getByPK($reply->getActorId());
        }
        if (\count($reply_actor) < 1) {
            return Event::next;
        }

        // Filter out multiple replies from the same actor
        $reply_actor = array_unique($reply_actor, \SORT_REGULAR);

        // Add to complementary info
        foreach ($reply_actor as $actor) {
            $reply_actor_url      = $actor->getUrl();
            $reply_actor_nickname = $actor->getNickname();

            if ($check_user && $actor->getId() === (Common::actor())->getId()) {
                // If the reply is yours
                $you_translation    = _m('You');
                $prepend            = "<a href={$reply_actor_url}>{$you_translation}</a>, " . ($prepend = &$complementary_info);
                $complementary_info = $prepend;
            } else {
                // If the repeat is from someone else
                $complementary_info .= "<a href={$reply_actor_url}>{$reply_actor_nickname}</a>, ";
            }
        }

        $complementary_info = rtrim(trim($complementary_info), ',');
        $complementary_info .= _m(' replied to this note.');
        $result[] = Formatting::twigRenderString($complementary_info, []);

        return Event::next;
    }

    public function onAddRoute(RouteLoader $r): bool
    {
        $r->connect('reply_add', '/object/note/new?to={actor_id<\d+>}&reply_to={note_id<\d+>}', [ReplyController::class, 'addReply']);
        $r->connect('conversation', '/conversation/{conversation_id<\d+>}', [Controller\Conversation::class, 'showConversation']);

        return Event::next;
    }

    public function onPostingGetContextActor(Request $request, Actor $actor, ?Actor $context_actor)
    {
        $to_query = $request->get('actor_id');
        if (!\is_null($to_query)) {
            // Getting the actor itself
            $context_actor = Actor::getById((int) $to_query);
            return Event::stop;
        }
        return Event::next;
    }

    public function onNoteDeleteRelated(Note &$note, Actor $actor): bool
    {
        Cache::delete("note-replies-{$note->getId()}");
        DB::wrapInTransaction(function () use ($note) {
            foreach ($note->getReplies() as $reply) {
                $reply->setReplyTo(null);
            }
        });
        Cache::delete("note-replies-{$note->getId()}");
        return Event::next;
    }
}