From 786a306f296e8b7e9b4ae78ba6ee4aee23339398 Mon Sep 17 00:00:00 2001
From: Vladimir Bryzgalov <vladimir.bryzgalov@gmail.com>
Date: Fri, 17 Apr 2026 22:44:41 +0500
Subject: [PATCH] feat(telegram-client): sendMessage wrapper classifying
 permanent/transient errors

---
 includes/class-telegram-client.php | 76 ++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 includes/class-telegram-client.php

diff --git a/includes/class-telegram-client.php b/includes/class-telegram-client.php
new file mode 100644
index 0000000..8089d31
--- /dev/null
+++ b/includes/class-telegram-client.php
@@ -0,0 +1,76 @@
+<?php
+declare(strict_types=1);
+
+namespace Cf7stg;
+
+final class TelegramClient
+{
+    /**
+     * Send a message. Throws TelegramException on error.
+     *
+     * @param string|int $chat_id
+     * @param string     $text        Pre-escaped HTML
+     * @param array|null $reply_markup Optional inline_keyboard structure
+     */
+    public static function send_message($chat_id, string $text, ?array $reply_markup = null): array
+    {
+        $token = Settings::get_bot_token();
+        if ($token === '' || $chat_id === '' || $chat_id === null) {
+            throw new TelegramException('Bot token or chat_id not configured', 0, true);
+        }
+
+        $body = [
+            'chat_id'    => $chat_id,
+            'text'       => $text,
+            'parse_mode' => 'HTML',
+            'disable_web_page_preview' => true,
+        ];
+        if ($reply_markup !== null) {
+            $body['reply_markup'] = wp_json_encode($reply_markup);
+        }
+
+        $url = 'https://api.telegram.org/bot' . $token . '/sendMessage';
+        $response = wp_remote_post($url, [
+            'timeout' => 10,
+            'body'    => $body,
+        ]);
+
+        if (is_wp_error($response)) {
+            throw new TelegramException('Network: ' . $response->get_error_message(), 0, false);
+        }
+
+        $code = (int)wp_remote_retrieve_response_code($response);
+        $raw = (string)wp_remote_retrieve_body($response);
+        $data = json_decode($raw, true);
+
+        if ($code === 200 && is_array($data) && !empty($data['ok'])) {
+            return $data;
+        }
+
+        $desc = is_array($data) ? (string)($data['description'] ?? '') : '';
+        $retry_after = 0;
+        if (is_array($data) && isset($data['parameters']['retry_after'])) {
+            $retry_after = (int)$data['parameters']['retry_after'];
+        }
+
+        $permanent = self::is_permanent($code, $desc);
+        throw new TelegramException(
+            sprintf('HTTP %d %s', $code, $desc !== '' ? $desc : 'unknown error'),
+            $code,
+            $permanent,
+            $retry_after
+        );
+    }
+
+    private static function is_permanent(int $code, string $desc): bool
+    {
+        if ($code === 401 || $code === 403) return true;
+        if ($code === 400) {
+            $d = strtolower($desc);
+            if (strpos($d, 'chat not found') !== false) return true;
+            if (strpos($d, 'bot was blocked') !== false) return true;
+            if (strpos($d, 'user is deactivated') !== false) return true;
+        }
+        return false;
+    }
+}