<?php

namespace FluentCommunity\App\Hooks\Handlers;

use FluentCommunity\App\Models\Comment;
use FluentCommunity\App\Models\Feed;
use FluentCommunity\App\Models\Notification;
use FluentCommunity\App\Models\NotificationSubscriber;
use FluentCommunity\App\Models\SpaceUserPivot;
use FluentCommunity\Framework\Support\Arr;

class NotificationEventHandler
{
    public function register()
    {
        add_action('fluent_community/comment_added', [$this, 'handleNewCommentEvent'], 10, 2);
        add_action('fluent_community/space_feed/created', [$this, 'handleNewSpaceFeed'], 10);
        add_action('fluent_community/feed/react_added', [$this, 'handleNewFeedReact'], 10, 2);

        add_action('fluent_community/space/member/role_updated', [$this, 'handleSpaceMemberRoleUpdated'], 10, 2);

        /*
         * Mentions handler
         */
        add_action('fluent_community/feed/created', [$this, 'maybeHandleMentionedUserIds'], 10, 1);
    }

    public function handleNewCommentEvent($comment, $feed)
    {
        $this->commentNotificationToAuthorFeed($comment, $feed);

        // now notify all users who commented on this feed
         $this->commentNotificationToFeedCommenters($comment, $feed);
    }

    public function handleNewSpaceFeed($feed)
    {
        if (!$this->willCreateFeedCreatedNotification($feed)) {
            return;
        }

        $user = $feed->user;
        $space = $feed->space;

        $this->maybeHasEveryoneTag($feed);

        $userIds = SpaceUserPivot::where('space_id', $space->id)
            ->where('user_id', '!=', $user->ID)
            ->where('status', 'active')
            ->pluck('user_id')
            ->toArray();

        if (!$userIds) {
            return;
        }

        $feedTitle = $feed->getHumanExcerpt(60);

        $notificationContent = \sprintf(
        /* translators: %1$s is the user name, %2$s is the feed title and %3$3s is the space title */
            __('%1$s posted %2$s in %3$s', 'fluent-community'),
            '<b class="fcom_nudn">' . esc_html($user->display_name) . '</b>',
            '<span class="fcom_nft">' . $feedTitle . '</span>',
            '<b class="fcom_nst">' . esc_html($space->title) . '</b>'
        );

        $route = $feed->getJsRoute();

        $notification = [
            'feed_id'         => $feed->id,
            'src_user_id'     => $user->ID,
            'src_object_type' => 'feed',
            'action'          => 'space_feed/created',
            'content'         => $notificationContent,
            'route'           => $route,
        ];

        $notification = Notification::create($notification);

        $notification->subscribe($userIds);
    }

    public function handleNewFeedReact($react, $feed)
    {
        if ($react->user_id == $feed->user_id) {
            return;
        }

        $feedTitle = $feed->getHumanExcerpt(60);
        $user = $react->user;

        if ($feed->reactions_count > 1) {
            // check if we have existing notification for this feed and user
            $existingNotification = Notification::where('feed_id', $feed->id)
                ->where('action', 'feed/react_added')
                ->first();

            if ($existingNotification) {
                $notificationContent = \sprintf(
                /* translators: %1$s is the user name, %2$s is the like count & %3$s is the feed title */
                    __('%1$s and %2$s other people reacted to %3$s', 'fluent-community'),
                    '<b class="fcom_nudn">' . esc_html($user->display_name) . '</b>',
                    '<b class="fcom_nrc">' . ($feed->reactions_count - 1) . '</b>',
                    '<span class="fcom_nft">' . $feedTitle . '</span>'
                );

                $existingNotification->content = $notificationContent;
                $existingNotification->src_user_id = $user->ID;
                $existingNotification->save();
                NotificationSubscriber::where('object_id', $existingNotification->id)
                    ->where('user_id', $feed->user_id)
                    ->update([
                        'is_read'    => 0,
                        'updated_at' => current_time('mysql')
                    ]);
                return;
            }
        }

        $notificationContent = \sprintf(
        /* translators: %1$s is the user name, %2$s is the feed title */
            __('%1$s reacted to %2$s', 'fluent-community'),
            '<b class="fcom_nudn">' . esc_html($user->display_name) . '</b>',
            '<span class="fcom_nft">' . $feedTitle . '</span>'
        );

        $route = $feed->getJsRoute();

        $notification = [
            'feed_id'         => $feed->id,
            'src_user_id'     => $user->ID,
            'src_object_type' => 'feed',
            'action'          => 'feed/react_added',
            'content'         => $notificationContent,
            'route'           => $route,
        ];

        $notification = Notification::create($notification);

        $notification->subscribe([$feed->user_id]);
    }

    public function handleSpaceMemberRoleUpdated($space, $pivot)
    {
        $user = $pivot->user;

        $notificationContent = \sprintf(
        /* translators: %1$s is the role name, %2$s is the space title */
            __('You have been added as %1$s in %2$s', 'fluent-community'),
            '<b>' . $pivot->role . '</b>',
            '<b>' . $space->title . '</b>'
        );

        $route = [
            'name'   => 'space_feeds',
            'params' => [
                'space' => $space->slug
            ]
        ];

        $notification = [
            'object_id'       => $space->id,
            'src_user_id'     => $user->ID,
            'src_object_type' => 'space',
            'action'          => 'space/member/role_updated',
            'content'         => $notificationContent,
            'route'           => $route,
        ];
        $notification = Notification::create($notification);
        $notification->subscribe([$pivot->user_id]);
    }

    protected function commentNotificationToAuthorFeed(Comment $comment, Feed $feed)
    {
        if ($comment->user_id == $feed->user_id) {
            return;
        }

        $mentionedUserIds = Arr::get($feed->meta, 'mentioned_user_ids', []);
        if (in_array($feed->user_id, $mentionedUserIds)) {
            return;
        }

        $commenter = '<b class="fcom_nudn">' . esc_html($comment->user->display_name) . '</b>';
        $feedTitle = $feed->getHumanExcerpt(60);

        $exist = null;
        if ($feed->comments_count > 1) {
            // check if we have existing notification for this feed and user
            $exist = Notification::where('feed_id', $feed->id)
                ->where('action', 'comment_added')
                ->first();

            $totalUsers = $feed->comments
                ->where('user_id', '!=', $feed->user_id)
                ->pluck('user_id')
                ->unique()
                ->count();

            if ($feed->space_id) {
                if ($totalUsers > 1) {
                    $notificationContent = \sprintf(
                    /* translators: %1$s is the user name, %2$s is the people count, %3$s is the feed title  and %4$s space title*/
                        __('%1$s and %2$s other people commented on your post %3$s in %4$s', 'fluent-community'),
                        $commenter,
                        '<b class="fcom_nrc">' . ($totalUsers - 1) . '</b>',
                        '<span class="fcom_nft">' . $feedTitle . '</span>',
                        '<b class="fcom_nst">' . $feed->space->title . '</b>'
                    );
                } else {
                    $notificationContent = \sprintf(
                    /* translators: %1$s is the user name, %2$s is the feed title  and %3$s space title*/
                        __('%1$s commented on your post: %2$s in %3$s', 'fluent-community'),
                        $commenter,
                        '<span class="fcom_nft">' . $feedTitle . '</span>',
                        '<b class="fcom_nst">' . $feed->space->title . '</b>'
                    );
                }
            } else {

                if ($totalUsers > 1) {
                    $notificationContent = \sprintf(
                    /* translators: %1$s is the user name, %2$s is the like count & %3$s is the feed title */
                        __('%1$s and %2$s other people commented on your post %3$s', 'fluent-community'),
                        $commenter,
                        '<b class="fcom_nrc">' . ($totalUsers - 1) . '</b>',
                        '<span class="fcom_nft">' . $feedTitle . '</span>'
                    );
                } else {
                    $notificationContent = \sprintf(
                    /* translators: %1$s is the user name & %2$s is the feed title */
                        __('%1$s commented on your post: %2$s', 'fluent-community'),
                        $commenter,
                        '<span class="fcom_nft">' . $feedTitle . '</span>'
                    );
                }
            }
        } else {
            if ($feed->space_id) {
                $notificationContent = \sprintf(
                /* translators: %1$s is the commenter name, %2$s is the feed title & %3$s is the space title */
                    __('%1$s commented on your post: %2$s in %3$s', 'fluent-community'),
                    $commenter,
                    '<span class="fcom_nft">' . $feedTitle . '</span>',
                    '<b class="fcom_nst">' . $feed->space->title . '</b>'
                );
            } else {
                $notificationContent = \sprintf(
                /* translators: %1$s is the commenter name & %2$s is the feed title */
                    __('%1$s commented on your post: %2$s', 'fluent-community'),
                    $commenter,
                    '<span class="fcom_nft">' . $feedTitle . '</span>'
                );
            }
        }

        $route = $feed->getJsRoute();

        if ($exist) {
            $exist->content = $notificationContent;
            $exist->updated_at = current_time('mysql');
            $exist->src_user_id = $comment->user->ID;
            $exist->object_id = $comment->id;
            $exist->save();

            NotificationSubscriber::where('object_id', $exist->id)
                ->where('user_id', $feed->user_id)
                ->update([
                    'is_read'    => 0,
                    'updated_at' => current_time('mysql')
                ]);

            do_action('fluent_community/notification/comment/notifed_to_author', [
                'user_ids'     => [$feed->user_id],
                'notification' => $exist,
                'key'          => 'notifed_to_author',
                'comment'      => $comment,
                'feed'         => $feed,
                'created'      => false
            ]);

            return;
        }

        $notification = [
            'feed_id'         => $feed->id,
            'object_id'       => $comment->id,
            'src_user_id'     => $comment->user_id,
            'src_object_type' => 'comment',
            'action'          => 'comment_added',
            'content'         => $notificationContent,
            'route'           => $route,
        ];

        $notification = Notification::create($notification);

        $notification->subscribe([$feed->user_id]);

        do_action('fluent_community/notification/comment/notifed_to_author', [
            'user_ids'     => [$feed->user_id],
            'notification' => $notification,
            'comment'      => $comment,
            'key'          => 'notifed_to_author',
            'feed'         => $feed,
            'created'      => true
        ]);
    }

    protected function commentNotificationToFeedCommenters($comment, $feed)
    {
        if ($comment->parent_id) {
            return $this->notifyForChildCommentReply($comment, $feed);
        }

        $userIds = Comment::whereNotIn('user_id', [$feed->user_id, $comment->user_id])
            ->where('post_id', $feed->id)
            ->whereNull('parent_id')
            ->distinct()
            ->pluck('user_id')
            ->toArray();

        $mentionedUserIds = Arr::get($comment->meta, 'mentioned_user_ids', []);

        if (!$userIds && !$mentionedUserIds) {
            return;
        }

        $commenter = '<b class="fcom_nudn">' . esc_html($comment->user->display_name) . '</b>';
        $feedTitle = '<span class="fcom_nft">' . $feed->getHumanExcerpt(60) . '</span>';

        $route = $feed->getJsRoute();
        $space = $feed->space;

        if ($feed->comments_count > 1) {
            $totalUsers = $feed->comments
                ->where('user_id', '!=', $comment->user_id)
                ->pluck('user_id')
                ->unique()
                ->count();

            if ($feed->space_id) {
                if ($totalUsers > 1) {
                    $notificationContent = \sprintf(
                    /* translators: %1$s is the user name, %2$s is the people count, %3$s is the feed title  and %4$s space title*/
                        __('%1$s and %2$s other people also commented on %3$s in %4$s', 'fluent-community'),
                        $commenter,
                        '<b class="fcom_nrc">' . ($totalUsers - 1) . '</b>',
                        $feedTitle,
                        '<b class="fcom_nst">' . $feed->space->title . '</b>'
                    );
                } else {
                    $notificationContent = \sprintf(
                    /* translators: %1$s is the user name, %2$s is the feed title  and %3$s space title*/
                        __('%1$s also commented on %2$s in %3$s', 'fluent-community'),
                        $commenter,
                        $feedTitle,
                        '<b class="fcom_nst">' . $feed->space->title . '</b>'
                    );
                }
            } else {
                if ($totalUsers > 1) {
                    $notificationContent = \sprintf(
                    /* translators: %1$s is the user name, %2$s is the like count & %3$s is the feed title */
                        __('%1$s and %2$s other people also commented on %3$s', 'fluent-community'),
                        $commenter,
                        '<b class="fcom_nrc">' . ($totalUsers - 1) . '</b>',
                        $feedTitle,
                    );
                } else {
                    $notificationContent = \sprintf(
                    /* translators: %1$s is the user name & %2$s is the feed title */
                        __('%1$s also commented on %2$s', 'fluent-community'),
                        $commenter,
                        $feedTitle,
                    );
                }
            }
        } else {
            if ($feed->space_id) {
                $notificationContent = \sprintf(
                /* translators: %1$s is the commenter name, %2$s is the feed title & %3$s is the space title */
                    __('%1$s also commented on %2$s in %3$s', 'fluent-community'),
                    $commenter,
                    $feedTitle,
                    '<b class="fcom_nst">' . $space->title . '</b>'
                );
            } else {
                $notificationContent = \sprintf(
                /* translators: %1$s is the commenter name & %2$s is the feed title */
                    __('%1$s also commented on %2$s', 'fluent-community'),
                    $commenter,
                    $feedTitle,
                );
            }
        }

        if ($mentionedUserIds) {
            $mentionNotification = Notification::create([
                'feed_id'         => $feed->id,
                'object_id'       => $comment->id,
                'src_user_id'     => $comment->user_id,
                'src_object_type' => 'comment',
                'action'          => 'mention_added',
                'content'         => \sprintf(
                /* translators: %1$s is the commenter name & %2$s is the feed title */
                    __('%1$s mentioned you in a comment at %2$s', 'fluent-community'),
                    $commenter,
                    $feedTitle,
                ),
                'route'           => $route,
            ]);

            $mentionNotification->subscribe($mentionedUserIds);

            do_action('fluent_community/notification/comment/notifed_to_mentions', [
                'user_ids'     => $mentionedUserIds,
                'notification' => $mentionNotification,
                'key'          => 'notifed_to_mentions',
                'comment'      => $comment,
                'feed'         => $feed
            ]);
        }

        if ($mentionedUserIds) {
            $userIds = array_values(array_diff($userIds, $mentionedUserIds));
        }

        if (!$userIds) {
            return;
        }

        $existIds = Notification::where('feed_id', $feed->id)
            ->where('action', 'comment_added')
            ->whereDoesntHave('subscribers', function ($query) use ($feed, $comment) {
                $query->whereIn('user_id', [$feed->user_id, $comment->user_id]);
            })
            ->pluck('id')
            ->toArray();

        $existingSubscriberUserIds = [];
        if (!empty($existIds)) {
            Notification::whereIn('id', $existIds)->update([
                'content'    => $notificationContent,
                'updated_at' => current_time('mysql'),
                'src_user_id' => $comment->user_id,
                'object_id'  => $comment->id
            ]);

            $existingSubscriberUserIds = NotificationSubscriber::whereIn('object_id', $existIds)
                ->pluck('user_id')
                ->unique()
                ->toArray();
    
            NotificationSubscriber::whereIn('object_id', $existIds)
                ->whereIn('user_id', $existingSubscriberUserIds)
                ->update([
                    'is_read'    => 0,
                    'updated_at' => current_time('mysql')
                ]);
        }

        if (!empty($existingSubscriberUserIds)) {
            $userIds = array_values(array_diff($userIds, $existingSubscriberUserIds));
        }

        $notification = [
            'feed_id'         => $feed->id,
            'object_id'       => $comment->id,
            'src_user_id'     => $comment->user_id,
            'src_object_type' => 'comment',
            'action'          => 'comment_added',
            'content'         => $notificationContent,
            'route'           => $route,
        ];

        foreach ($userIds as $userId) {
            $createdNotification = Notification::create($notification);
            $createdNotification->subscribe([$userId]);
        }

        $sendingUserIds = array_merge($userIds, $existingSubscriberUserIds);

        do_action('fluent_community/notification/comment/notifed_to_other_users', [
            'user_ids'     => $sendingUserIds,
            'key'          => 'notifed_to_other_users',
            'notification' => $notification,
            'comment'      => $comment,
            'feed'         => $feed
        ]);
    }

    protected function notifyForChildCommentReply($comment, $feed)
    {
        // This is a parent comment, so we need to notify the parent comment author & all child comment authors
        $childCommentUserIds = Comment::where(function ($q) use ($comment) {
            $q->where('parent_id', $comment->parent_id)
                ->orWhere('id', $comment->parent_id);
        })
            ->whereNotIn('user_id', [$comment->user_id, $feed->user_id])
            ->select(['user_id'])
            ->distinct('user_id')
            ->get()
            ->pluck('user_id')
            ->toArray();

        if (!$childCommentUserIds) {
            return false;
        }

        $commenter = '<b class="fcom_nudn">' . esc_html($comment->user->display_name) . '</b>';

        $existingNotification = Notification::where('object_id', $comment->parent_id)
            ->where('action', 'child_comment_added')
            ->first();

        if ($existingNotification) {
            $newContent = \sprintf(
            /* translators: %1$s is the commenter name, %2$s is the comment user count & %3$s feed excerpt */
                __('%1$s and %2$s other people replied to your comment at %3$s', 'fluent-community'),
                $commenter,
                '<b class="fcom_nrc">' . count($childCommentUserIds) . '</b>',
                '<b class="fcom_nft">' . $feed->getHumanExcerpt(60) . '</b>'
            );

            $route = $existingNotification->route;
            $route['query'] = [
                'comment_id' => $comment->id
            ];

            $existingNotification->content = $newContent;
            $existingNotification->updated_at = current_time('mysql');
            $existingNotification->src_user_id = $comment->user_id;
            $existingNotification->route = $route;
            $existingNotification->save();

            NotificationSubscriber::where('object_id', $existingNotification->id)
                ->whereIn('user_id', $childCommentUserIds)
                ->update([
                    'is_read'    => 0,
                    'updated_at' => current_time('mysql')
                ]);

            do_action('fluent_community/notification/comment/notifed_to_thread_commetenter', [
                'user_ids'     => $childCommentUserIds,
                'notification' => $existingNotification,
                'key'          => 'notifed_to_thread_commetenter',
                'comment'      => $comment,
                'feed'         => $feed
            ]);

            return $existingNotification;
        }

        $notificationContent = \sprintf(
        /* translators: %1$s is the commenter name & %2$s is the feed excerpt */
            __('%1$s replied to your comment at %2$s', 'fluent-community'),
            $commenter,
            '<b class="fcom_nft">' . $feed->getHumanExcerpt(60) . '</b>'
        );

        $route = $feed->getJsRoute();

        $route['query'] = [
            'comment_id' => $comment->id
        ];

        $notification = [
            'feed_id'         => $feed->id,
            'object_id'       => $comment->parent_id,
            'src_user_id'     => $comment->user_id,
            'src_object_type' => 'comment',
            'action'          => 'child_comment_added',
            'content'         => $notificationContent,
            'route'           => $route,
        ];

        $notification = Notification::create($notification);
        $notification->subscribe($childCommentUserIds);

        do_action('fluent_community/notification/comment/notifed_to_thread_commetenter', [
            'user_ids'     => $childCommentUserIds,
            'notification' => $notification,
            'key'          => 'notifed_to_thread_commetenter',
            'comment'      => $comment,
            'feed'         => $feed
        ]);

        return $notification;
    }

    public function maybeHandleMentionedUserIds($feed)
    {
        $mentionedUserIds = Arr::get($feed->meta, 'mentioned_user_ids', []);
        if (!$mentionedUserIds) {
            return;
        }

        do_action('fluent_community/feed_mentioned_user_ids', $feed, $mentionedUserIds);

        $feedTitle = $feed->getHumanExcerpt(60);
        $user = $feed->user;

        $notificationContent = \sprintf(
        /* translators: %1$s is the user name, %2$s is the feed title */
            __('%1$s mentioned you in a post: %2$s', 'fluent-community'),
            '<b class="fcom_nudn">' . esc_html($user->display_name) . '</b>',
            '<b class="fcom_nft">' . $feedTitle . '</b>'
        );

        $route = $feed->getJsRoute();

        $notification = [
            'feed_id'         => $feed->id,
            'src_user_id'     => $user->ID,
            'src_object_type' => 'feed',
            'action'          => 'feed/mentioned',
            'content'         => $notificationContent,
            'route'           => $route,
        ];

        $notification = Notification::create($notification);

        $notification->subscribe($mentionedUserIds);
    }

    private function maybeHasEveryoneTag(Feed $feed)
    {
        if (!$feed->space_id) {
            return;
        }

        if (!$feed->isEnabledForEveryoneTag()) {
            return;
        }

        // we have everyone
        // check if current user is a moderator or admin
        $user = $feed->user;
        $spaceRole = $user->getSpaceRole($feed->space);
        if (!in_array($spaceRole, ['admin', 'moderator'])) {
            return;
        }

        do_action('fluent_community/feed/scheduling_everyone_tag', $feed);
        // Let's schedule an email hook to send email to everyone for this post
        // We are scheduling this after 5 minutes of the post publish for performance
        as_schedule_single_action(time() + 300, 'fluent_community/email_notify_users_everyone_tag', [
            $feed->id,
            0
        ], 'fluent-community');
    }

    private function willCreateFeedCreatedNotification($feed)
    {
        // validate if the user is a moderator
        if (!$feed->user) {
            return;
        }

        if ($feed->user->isCommunityModerator()) {
            return true;
        }

        if ($feed->space) {
            $role = $feed->user->getSpaceRole($feed->space);
            return in_array($role, ['admin', 'moderator']);
        }

        return false;
    }
}