<?php

/**
 * Provides access to create & get alerts for a user, as well as their PMs.
 *
 * @package NamelessMC\Core
 * @author Samerton
 * @version 2.0.0-pr8
 * @license MIT
 */
class Alert
{
    /**
     * Creates an alert for the specified user.
     *
     * @deprecated Use Alert::send instead
     *
     * @param int     $user_id    Contains the ID of the user who we are creating the alert for.
     * @param string  $type       Contains the alert type, eg 'tag' for user tagging.
     * @param array   $text_short Contains the alert text in short form for the dropdown.
     * @param array   $text       Contains full information about the alert.
     * @param ?string $link       Contains link to view the alert, defaults to #.
     * @param ?string $content    Optional alert content.
     */
    public static function create(int $user_id, string $type, array $text_short, array $text, ?string $link = '#', ?string $content = null): void
    {
        $db = DB::getInstance();

        $language = $db->query('SELECT nl2_languages.short_code AS `short_code` FROM nl2_users LEFT JOIN nl2_languages ON nl2_languages.id = nl2_users.language_id WHERE nl2_users.id = ?', [$user_id]);

        if (!$language->count()) {
            return;
        }

        $language = new Language($text_short['path'], $language->first()->short_code);

        $text_short = $text_short['content'] ?? str_replace($text_short['replace'] ?? '', $text_short['replace_with'] ?? '', $language->get($text_short['file'], $text_short['term']));
        $text = $text['content'] ?? str_replace($text['replace'] ?? '', $text['replace_with'] ?? '', $language->get($text['file'], $text['term']));

        $db->insert('alerts', [
            'user_id' => $user_id,
            'type' => $type,
            'url' => $link,
            'content_short' => $text_short,
            'content' => $text,
            'content_rich' => $content,
            'created' => date('U'),
        ]);
    }

    /**
     * Post a new alert to a user.
     *
     * @param  int         $userId
     * @param  string      $title
     * @param  string|null $content
     * @param  string|null $link       Optional link to redirect the user to on click
     * @param  bool        $skipPurify If true the content will not be purified before displaying to user - use with care
     * @return void
     */
    public static function send(int $userId, string $title, ?string $content, ?string $link = '', bool $skipPurify = false)
    {
        DB::getInstance()->insert('alerts', [
            'user_id' => $userId,
            'type' => 'alert',
            'url' => $link ?? '',
            'content_short' => $title, // Column maintained for legacy reasons
            'content' => $title,
            'content_rich' => $content ?? '',
            'created' => date('U'),
            'bypass_purify' => $skipPurify,
        ]);
    }

    /**
     * Get user alerts.
     *
     * @param int  $user_id Contains the ID of the user who we are getting alerts for.
     * @param bool $all     Do we want to get all alerts (including read), or not; defaults to false).
     *
     * @return array All their alerts.
     */
    public static function getAlerts(int $user_id, bool $all = false): array
    {
        $db = DB::getInstance();

        if ($all == true) {
            $alerts = $db->get('alerts', ['user_id', $user_id])->results();
        } else {
            $alerts = $db->query('SELECT * FROM nl2_alerts WHERE user_id = ? AND `read` = 0', [$user_id])->results();
        }

        return array_map(
            static fn($alert) => [
                ...(array) $alert,
                'content' => Output::getClean($alert->content),
                'content_short' => Output::getClean($alert->content_short),
                'content_rich' => $alert->bypass_purify ? $alert->content_rich :  Output::getPurified($alert->content_rich, false, false),
            ],
            $alerts
        );
    }

    /**
     * Get a users unread messages.
     *
     * @param int  $user_id The ID of the user who we are getting messages for.
     * @param bool $all     Get all alerts (including read), or not. Defaults to false.
     *
     * @return array All their messages matching the $all filter.
     */
    public static function getPMs(int $user_id, bool $all = false): array
    {
        $db = DB::getInstance();

        if ($all == true) {
            $pms_access = $db->get('private_messages_users', ['user_id', $user_id])->results();
            $pms = [];

            foreach ($pms_access as $pm) {
                // Get actual PM information
                $pm_full = $db->get('private_messages', ['id', $pm->pm_id])->results();

                if (!count($pm_full)) {
                    continue;
                }

                $pm_full = $pm_full[0];

                $pms[] = [
                    'id' => $pm_full->id,
                    'title' => Output::getClean($pm_full->title),
                    'created' => $pm_full->created,
                    'author_id' => $pm_full->author_id,
                    'last_reply_user' => $pm_full->last_reply_user,
                    'last_reply_date' => $pm_full->last_reply_date,
                ];
            }

            return $pms;
        }

        $pms = $db->get('private_messages_users', ['user_id', $user_id])->results();
        $unread = [];

        foreach ($pms as $pm) {
            if ($pm->read == 0) {
                $pm_full = $db->get('private_messages', ['id', $pm->pm_id])->results();

                if (!count($pm_full)) {
                    continue;
                }

                $pm_full = $pm_full[0];

                $unread[] = [
                    'id' => $pm_full->id,
                    'title' => Output::getClean($pm_full->title),
                    'created' => $pm_full->created,
                    'author_id' => $pm_full->author_id,
                    'last_reply_user' => $pm_full->last_reply_user,
                    'last_reply_date' => $pm_full->last_reply_date,
                ];
            }
        }

        return $unread;
    }
}