<?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 Plugin\RepeatNote;

use App\Core\DB\DB;
use App\Core\Event;
use function App\Core\I18n\_m;
use App\Core\Modules\NoteHandlerPlugin;
use App\Core\Router\RouteLoader;
use App\Core\Router\Router;
use App\Entity\Activity;
use App\Entity\Actor;
use App\Entity\Note;
use App\Util\Common;
use App\Util\Exception\ServerException;
use App\Util\Formatting;
use Component\Language\Entity\Language;
use Component\Posting\Posting;
use DateTime;
use Plugin\RepeatNote\Entity\NoteRepeat;
use const SORT_REGULAR;
use Symfony\Component\HttpFoundation\Request;

class RepeatNote extends NoteHandlerPlugin
{
    public static function repeatNote(Note $note, int $actor_id, string $source = 'web'): ?Activity
    {
        $repeat_entity = DB::findBy('note_repeat', [
            'actor_id' => $actor_id,
            'note_id'  => $note->getId(),
        ])[0] ?? null;

        if (!\is_null($repeat_entity)) {
            return null;
        }

        // If it's a repeat, the reply_to should be to the original, conversation ought to be the same
        $og_id                  = $note->getId();
        $extra_args['reply_to'] = $og_id;

        // Create a new note with the same content as the original
        $repeat = Posting::storeLocalNote(
            actor: Actor::getById($actor_id),
            content: $note->getContent(),
            content_type: $note->getContentType(),
            language: \is_null($lang_id = $note->getLanguageId()) ? null : Language::getById($lang_id)->getLocale(),
            processed_attachments: $note->getAttachmentsWithTitle(),
            process_note_content_extra_args: $extra_args,
            notify: false,
        );

        DB::persist(NoteRepeat::create([
            'note_id'   => $repeat->getId(),
            'actor_id'  => $actor_id,
            'repeat_of' => $og_id,
        ]));

        // Log an activity
        $repeat_activity = Activity::create([
            'actor_id'    => $actor_id,
            'verb'        => 'repeat',
            'object_type' => 'note',
            'object_id'   => $note->getId(),
            'source'      => $source,
        ]);
        DB::persist($repeat_activity);

        Event::handle('NewNotification', [$actor = Actor::getById($actor_id), $repeat_activity, [],  _m('{nickname} repeated note {note_id}.', ['nickname' => $actor->getNickname(), 'note_id' => $repeat_activity->getObjectId()])]);

        return $repeat_activity;
    }

    public static function unrepeatNote(int $note_id, int $actor_id, string $source = 'web'): ?Activity
    {
        $already_repeated = DB::findBy(NoteRepeat::class, ['actor_id' => $actor_id, 'repeat_of' => $note_id])[0] ?? null;

        if (!\is_null($already_repeated)) { // If it was repeated, then we can undo it
            // Find previous repeat activity
            $already_repeated_activity = DB::findBy(Activity::class, [
                'actor_id'    => $actor_id,
                'verb'        => 'repeat',
                'object_type' => 'note',
                'object_id'   => $already_repeated->getRepeatOf(),
            ])[0] ?? null;

            // Remove the clone note
            DB::findBy(Note::class, ['id' => $already_repeated->getNoteId()])[0]->delete(actor: Actor::getById($actor_id));

            // Remove from the note_repeat table
            DB::remove(DB::findBy(NoteRepeat::class, ['note_id' => $already_repeated->getNoteId()])[0]);

            // Log an activity
            $undo_repeat_activity = Activity::create([
                'actor_id'    => $actor_id,
                'verb'        => 'undo',
                'object_type' => 'activity',
                'object_id'   => $already_repeated_activity->getId(),
                'source'      => $source,
            ]);
            DB::persist($undo_repeat_activity);

            Event::handle('NewNotification', [$actor = Actor::getById($actor_id), $undo_repeat_activity, [],  _m('{nickname} unrepeated note {note_id}.', ['nickname' => $actor->getNickname(), 'note_id' => $note_id])]);

            return $undo_repeat_activity;
        } else {
            // Either was undoed already
            if (!\is_null($already_repeated_activity = DB::findBy('activity', [
                'actor_id' => $actor_id,
                'verb' => 'repeat',
                'object_type' => 'note',
                'object_id' => $note_id,
            ])[0] ?? null)) {
                return DB::findBy('activity', [
                    'actor_id'    => $actor_id,
                    'verb'        => 'undo',
                    'object_type' => 'activity',
                    'object_id'   => $already_repeated_activity->getId(),
                ])[0] ?? null; // null if not undoed
            } else {
                // or it's an attempt to undo something that wasn't repeated in the first place,
                return null;
            }
        }
    }

    /**
     * Filters repeats out of Conversations, and replaces a repeat with the original Note on Actor feed
     *
     * @return bool
     */
    public function onFilterNoteList(?Actor $actor, array &$notes, Request $request)
    {
        // Replaces repeat with original note on Actor feed
        // it's pretty cool
        if (str_starts_with($request->get('_route'), 'actor_view_')) {
            $notes = array_map(
                fn (Note $note) => NoteRepeat::isNoteRepeat($note)
                        ? Note::getById(NoteRepeat::getByPK($note->getId())->getRepeatOf())
                        : $note,
                $notes,
            );
            return Event::next;
        }

        // Filter out repeats altogether
        $notes = array_filter($notes, fn (Note $note) => !NoteRepeat::isNoteRepeat($note));
        return Event::next;
    }

    /**
     * HTML rendering event that adds the repeat form as a note
     * action, if a user is logged in
     *
     * @return bool Event hook
     */
    public function onAddNoteActions(Request $request, Note $note, array &$actions): bool
    {
        // Only logged users can repeat notes
        if (\is_null($user = Common::user())) {
            return Event::next;
        }

        // If note is repeated, "is_repeated" is 1, 0 otherwise.
        $is_repeat = ($note_repeat = DB::findBy('note_repeat', [
            'actor_id'  => $user->getId(),
            'repeat_of' => $note->getId(),
        ])) !== [] ? 1 : 0;

        // Generating URL for repeat action route
        $args              = ['note_id' => $is_repeat === 0 ? $note->getId() : $note_repeat[0]->getRepeatOf()];
        $type              = Router::ABSOLUTE_PATH;
        $repeat_action_url = $is_repeat
            ? Router::url('repeat_remove', $args, $type)
            : Router::url('repeat_add', $args, $type);

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

        $extra_classes = $is_repeat ? 'note-actions-set' : 'note-actions-unset';
        $repeat_action = [
            'url'     => $repeat_action_url,
            'title'   => $is_repeat ? 'Remove this repeat' : 'Repeat this note!',
            'classes' => "button-container repeat-button-container {$extra_classes}",
            'note_id' => 'repeat-button-container-' . $note->getId(),
        ];

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

    /**
     * Append on note information about user actions.
     *
     * @return array|bool
     */
    public function onAppendCardNote(array $vars, array &$result)
    {
        // if note is the original and user isn't the one who repeated, append on end "user repeated this"
        // if user is the one who repeated, append on end "you repeated this, remove repeat?"
        $check_user = !\is_null(Common::user());

        $note = $vars['note'];

        $complementary_info = '';
        $repeat_actor       = [];
        $note_repeats       = NoteRepeat::getNoteRepeats($note);

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

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

        // Add to complementary info
        foreach ($repeat_actor as $actor) {
            $repeat_actor_url      = $actor->getUrl();
            $repeat_actor_nickname = $actor->getNickname();

            if ($check_user && $actor->getId() === (Common::actor())->getId()) {
                // If the repeat is yours
                try {
                    $you_translation = _m('You');
                } catch (ServerException $e) {
                    $you_translation = 'You';
                }

                $prepend            = "<a href={$repeat_actor_url}>{$you_translation}</a>, " . ($prepend = &$complementary_info);
                $complementary_info = $prepend;
            } else {
                // If the repeat is from someone else
                $complementary_info .= "<a href={$repeat_actor_url}>{$repeat_actor_nickname}</a>, ";
            }
        }

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

        return $result;
    }

    public function onAddRoute(RouteLoader $r): bool
    {
        // Add/remove note to/from repeats
        $r->connect(id: 'repeat_add', uri_path: '/object/note/{note_id<\d+>}/repeat', target: [Controller\Repeat::class, 'repeatAddNote']);
        $r->connect(id: 'repeat_remove', uri_path: '/object/note/{note_id<\d+>}/unrepeat', target: [Controller\Repeat::class, 'repeatRemoveNote']);

        return Event::next;
    }

    // ActivityPub

    private function activitypub_handler(Actor $actor, \ActivityPhp\Type\AbstractObject $type_activity, mixed $type_object, ?\Plugin\ActivityPub\Entity\ActivitypubActivity &$ap_act): bool
    {
        if (!\in_array($type_activity->get('type'), ['Announce', 'Undo'])) {
            return Event::next;
        }
        if ($type_activity->get('type') === 'Announce') { // Repeat
            if ($type_object instanceof \ActivityPhp\Type\AbstractObject) {
                if ($type_object->get('type') === 'Note') {
                    $note    = \Plugin\ActivityPub\Util\Model\Note::fromJson($type_object);
                    $note_id = $note->getId();
                } else {
                    return Event::next;
                }
            } elseif ($type_object instanceof Note) {
                $note    = $type_object;
                $note_id = $note->getId();
            } else {
                return Event::next;
            }
        } else { // Undo Repeat
            if ($type_object instanceof \ActivityPhp\Type\AbstractObject) {
                $ap_prev_repeat_act = \Plugin\ActivityPub\Util\Model\Activity::fromJson($type_object);
                $prev_repeat_act    = $ap_prev_repeat_act->getActivity();
                if ($prev_repeat_act->getVerb() === 'repeat' && $prev_repeat_act->getObjectType() === 'note') {
                    $note_id = $prev_repeat_act->getObjectId();
                } else {
                    return Event::next;
                }
            } elseif ($type_object instanceof Activity) {
                if ($type_object->getVerb() === 'repeat' && $type_object->getObjectType() === 'note') {
                    $note_id = $type_object->getObjectId();
                } else {
                    return Event::next;
                }
            } else {
                return Event::next;
            }
        }

        if ($type_activity->get('type') === 'Announce') {
            $activity = self::repeatNote($note ?? Note::getById($note_id), $actor->getId(), source: 'ActivityPub');
        } else {
            $activity = self::unrepeatNote($note_id, $actor->getId(), source: 'ActivityPub');
        }
        if (!\is_null($activity)) {
            // Store ActivityPub Activity
            $ap_act = \Plugin\ActivityPub\Entity\ActivitypubActivity::create([
                'activity_id'  => $activity->getId(),
                'activity_uri' => $type_activity->get('id'),
                'created'      => new DateTime($type_activity->get('published') ?? 'now'),
                'modified'     => new DateTime(),
            ]);
            DB::persist($ap_act);
        }
        return Event::stop;
    }

    public function onNewActivityPubActivity(Actor $actor, \ActivityPhp\Type\AbstractObject $type_activity, \ActivityPhp\Type\AbstractObject $type_object, ?\Plugin\ActivityPub\Entity\ActivitypubActivity &$ap_act): bool
    {
        return $this->activitypub_handler($actor, $type_activity, $type_object, $ap_act);
    }

    public function onNewActivityPubActivityWithObject(Actor $actor, \ActivityPhp\Type\AbstractObject $type_activity, mixed $type_object, ?\Plugin\ActivityPub\Entity\ActivitypubActivity &$ap_act): bool
    {
        return $this->activitypub_handler($actor, $type_activity, $type_object, $ap_act);
    }

    public function onGSVerbToActivityStreamsTwoActivityType(string $verb, ?string &$gs_verb_to_activity_stream_two_verb): bool
    {
        if ($verb === 'repeat') {
            $gs_verb_to_activity_stream_two_verb = 'Announce';
            return Event::stop;
        }
        return Event::next;
    }
}