<?php
if (!defined('ABSPATH')) exit;
class ScotTelegram
{
	private static ?ScotTelegram $instance = null;
	private string $_api_url;
	private $token;

	private function __construct()
	{
		$this->_api_url = scot_get_option('telegram_server_url', 'https://api.telegram.org/bot');
		$this->token = scot_get_option('bot_api_token', '');
	}

	static public function getInstance()
	{
		if (is_null(self::$instance)) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	public function sendMessage($chat_id, $text, $thread_id = '', $debug = false)
	{
		$data = [
			'chat_id' => $chat_id,
			'message_thread_id' => $thread_id,
			'text'    => $text,
			'parse_mode' => 'html'
		];

		$result = $this->makeRequest('sendMessage', $data);
		if($debug){
			return $result;
		}
		if (empty($result['ok']) && empty($result['result'])) return null;
		return $result['result'];

	}

	public function createForumTopic($chat_id, $name)
	{
		$data = [
			'chat_id' => $chat_id,
			'name'    => $name,
		];

		$result = $this->makeRequest('createForumTopic', $data);
		if (empty($result['ok']) && empty($result['result'])) return null;

		return $result['result'];

	}

	public function sendPhoto($chat_id, $photo, $caption = '')
	{
		$data = [
			'chat_id' => $chat_id,
			'photo'   => $photo,
			'caption' => $caption,
			'parse_mode' => 'html'
		];

		return $this->makeRequest('sendPhoto', $data, ["Content-Type:multipart/form-data"]);
	}

	public function sendDocument($chat_id, $document, $caption = '')
	{
		$data = [
			'chat_id'  => $chat_id,
			'document' => $document,
		];
		if (!empty($caption)) {
			$data['caption'] = $caption;
		}

		return $this->makeRequest('sendDocument', $data, ["Content-Type:multipart/form-data"]);
	}

	public function deleteMessage($chat_id, $message_id)
	{
		$data = [
			'chat_id'    => $chat_id,
			'message_id' => $message_id,
		];

		return $this->makeRequest('deleteMessage', $data);
	}

	public function editMessage($chat_id, $message_id, $new_text)
	{
		$data = [
			'chat_id'    => $chat_id,
			'message_id' => $message_id,
			'text'       => $new_text,
		];

		return $this->makeRequest('editMessageText', $data);
	}

	private function makeRequest($method, $data, $headers = ["Content-Type: application/json"])
	{
		if (!$this->token) {
			return false;
		}
		$result = wp_remote_post($this->_api_url . $this->token . '/' . $method,
			[
				'method'  => 'POST',
				'body'    => $data,
				'headers' => $headers,
				'timeout' => 45,
			]
		);
		$body = wp_remote_retrieve_body($result);
		return json_decode($body, true);
	}
	
	public function getFileUrl($file_id)
	{
		$transient_name = "scot_file_url_$file_id";
		$transient = get_transient($transient_name);
		if(!empty($transient)) {
			return $transient;
		}
		$api_url = "https://api.telegram.org/bot{$this->token}/getFile?file_id={$file_id}";
		$response = wp_remote_get($api_url);

		if (is_wp_error($response)) {
			return false;
		}

		$body = wp_remote_retrieve_body($response);
		$data = json_decode($body, true);

		if (!$data['ok']) {
			return false;
		}

		$file_path = $data['result']['file_path'];

		$result = "https://api.telegram.org/file/bot{$this->token}/{$file_path}";
		set_transient($transient_name, $result, HOUR_IN_SECONDS);
		return $result;
	}
}