<?php
if (!defined('ABSPATH')) exit;
class ScotThread
{
	private ?ScotTelegram $telegram;

	public function __construct()
	{
		$this->telegram = ScotTelegram::getInstance();
	}

	public static function threadsTableName(): string
	{
		global $wpdb;
		return $wpdb->prefix . 'scot_threads';
	}

	public function getOrCreateThread($user_id)
	{
		$thread = self::getThread($user_id);

		if ($thread) return $thread;

		$tread_name = scot_get_option('tread_name', 'Thread for user {{user_id}}');
		if (!str_contains($tread_name, '{{user_id}}')) {
			$tread_name .= ' {{user_id}}';
		}
		$tread_name = str_replace('{{user_id}}', $user_id, $tread_name);

		$thread_data = $this->telegram->createForumTopic(ScotChat::groupId(), $tread_name);

		self::insertThread($thread_data['message_thread_id'], $user_id);

		return self::getThread($user_id);
	}

	public static function getThread($user_id)
	{
		global $wpdb;
		$cache_key = 'thread_user_id_' . $user_id;
		$cached_result = wp_cache_get($cache_key);

		if ($cached_result !== false) {
			return $cached_result;
		}

		$threads_table_name = self::threadsTableName();
		$results = $wpdb->get_results(
			$wpdb->prepare(
				"SELECT thread_id FROM %i WHERE user_id = %d",
				$threads_table_name,
				$user_id
			),
			ARRAY_A
		); // db call ok

		if (!empty($results[0])) {
			wp_cache_set($cache_key, $results[0]);
			return $results[0];
		}

		return null;
	}

	private static function insertThread($thread_id, $user_id, $responder_nickname = '')
	{
		global $wpdb;
		return $wpdb->insert(self::threadsTableName(), [
			'thread_id'          => $thread_id,
			'user_id'            => $user_id,
			'responder_nickname' => $responder_nickname,
		]);
	}
}