<?php

namespace Jakach\Logging\Notifier;

use Jakach\Logging\Model\Alert;
use Jakach\Logging\Storage\Repository;

class TelegramNotifier
{
    private ?string $botToken;
    private ?string $chatId;

    public function __construct(
        private Repository $repo,
    ) {
        $this->botToken = $this->repo->getConfig('telegram_bot_token');
        $this->chatId = $this->repo->getConfig('telegram_chat_id');
        error_log(sprintf("Telegram: bot_token=%s, chat_id=%s",
            $this->botToken ? substr($this->botToken, 0, 8) . '...' : 'EMPTY',
            $this->chatId ?? 'EMPTY'));
    }

    public function isConfigured(): bool
    {
        return !empty($this->botToken) && !empty($this->chatId);
    }

    public function send(Alert $alert): bool
    {
        if (!$this->isConfigured()) {
            error_log("Telegram: not configured, skipping alert #{$alert->id}");
            return false;
        }

        error_log("Telegram: sending alert #{$alert->id} [{$alert->severity->value}]...");

        $emoji = match ($alert->severity->value) {
            'emergency', 'critical_high', 'critical' => "\xF0\x9F\x94\xA5",
            'critical_low', 'error' => "\xE2\x9D\x8C",
            'warning_high', 'warning' => "\xE2\x9A\xA0\xEF\xB8\x8F",
            'warning_low' => "\xF0\x9F\x93\xA2",
            default => "\xE2\x84\xB9\xEF\xB8\x8F",
        };

        $text = sprintf(
            "%s *ALERT #%d* [%s]\n",
            $emoji,
            $alert->id,
            strtoupper($alert->severity->value)
        );
        $text .= sprintf("*Rule:* %s\n", $alert->ruleName);
        $text .= sprintf("*Source:* %s\n", $alert->sourceName ?? '—');
        $text .= sprintf("*Message:* ```\n%s\n```", mb_substr($alert->message, 0, 1000));

        $url = 'https://api.telegram.org/bot' . $this->botToken . '/sendMessage';

        error_log("Telegram: POST " . preg_replace('/bot.*\//', 'botTOKEN/', $url));

        $postData = http_build_query([
            'chat_id' => $this->chatId,
            'text' => $text,
            'parse_mode' => 'Markdown',
            'disable_web_page_preview' => true,
        ]);
        error_log("Telegram: post data length=" . strlen($postData) . ", text length=" . strlen($text));

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_TIMEOUT, 15);
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $curlError = curl_error($ch);
        curl_close($ch);

        error_log("Telegram: HTTP $httpCode, curl_error=$curlError, response=" . substr($response, 0, 500));

        if ($httpCode !== 200) {
            error_log("Telegram send failed (HTTP $httpCode): $response");
            return false;
        }

        error_log("Telegram: sent successfully");
        return true;
    }
}