<?php
declare(strict_types=1);

/**
 * Telegram-Transportfunktionen fuer Bot-Nachrichten und Dateiversand.
 *
 * Diese Datei kapselt die HTTP-Kommunikation mit der Telegram Bot API,
 * sowohl fuer JSON-Requests als auch fuer Multipart-Uploads von Bildern
 * und Dokumenten. Die Cron-Tasks muessen dadurch keine Request-Details kennen.
 */

require_once dirname(__DIR__, 3) . '/public/telegram/lib/http.php';


function telegramHttpPostMultipart(string $url, array $fields, string $fileField, string $filePath, ?string $fileName = null): array
{
    if (!is_file($filePath)) {
        return [
            'ok' => false,
            'error' => 'Datei fuer Telegram-Versand nicht gefunden: ' . $filePath,
            'body' => null,
        ];
    }

    if (DIRECTORY_SEPARATOR === '\\' && function_exists('shell_exec')) {
        $urlBase64 = base64_encode($url);
        $filePathBase64 = base64_encode($filePath);
        $fileNameBase64 = base64_encode((string) ($fileName ?? basename($filePath)));
        $fieldsBase64 = base64_encode(json_encode($fields, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES) ?: '{}');
        $fileFieldBase64 = base64_encode($fileField);

        $powerShellScript = str_replace(
            ['__URL_BASE64__', '__FILE_PATH_BASE64__', '__FILE_NAME_BASE64__', '__FIELDS_BASE64__', '__FILE_FIELD_BASE64__'],
            [$urlBase64, $filePathBase64, $fileNameBase64, $fieldsBase64, $fileFieldBase64],
            <<<'PS'
$ErrorActionPreference = 'Stop'
$url = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('__URL_BASE64__'))
$filePath = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('__FILE_PATH_BASE64__'))
$fileName = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('__FILE_NAME_BASE64__'))
$fileField = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('__FILE_FIELD_BASE64__'))
$fieldsJson = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String('__FIELDS_BASE64__'))
$fieldsObject = $fieldsJson | ConvertFrom-Json
$form = @{}
foreach ($property in $fieldsObject.PSObject.Properties) {
    $form[$property.Name] = [string] $property.Value
}
$form[$fileField] = Get-Item -LiteralPath $filePath
try {
    $response = Invoke-RestMethod -Method Post -Uri $url -Form $form
    [PSCustomObject]@{
        ok = $true
        body = ($response | ConvertTo-Json -Depth 20 -Compress)
        error = ''
    } | ConvertTo-Json -Compress
} catch {
    [PSCustomObject]@{
        ok = $false
        body = ''
        error = $_.Exception.Message
    } | ConvertTo-Json -Compress
}
PS
        );
        $encodedCommandBinary = function_exists('iconv')
            ? iconv('UTF-8', 'UTF-16LE', $powerShellScript)
            : $powerShellScript;
        $encodedCommand = base64_encode($encodedCommandBinary === false ? $powerShellScript : $encodedCommandBinary);
        $command = 'powershell -NoProfile -ExecutionPolicy Bypass -EncodedCommand ' . $encodedCommand;
        $rawOutput = shell_exec($command);

        if ($rawOutput !== null && trim($rawOutput) !== '') {
            $decodedShell = json_decode(trim($rawOutput), true);
            if (is_array($decodedShell)) {
                return [
                    'ok' => (bool) ($decodedShell['ok'] ?? false),
                    'error' => $decodedShell['error'] ?? null,
                    'body' => $decodedShell['body'] ?? null,
                ];
            }
        }
    }

    if (function_exists('curl_init')) {
        $payload = $fields;
        $extension = strtolower((string) pathinfo($filePath, PATHINFO_EXTENSION));
        $mimeType = match ($extension) {
            'png' => 'image/png',
            'jpg', 'jpeg' => 'image/jpeg',
            'svg' => 'image/svg+xml',
            default => 'application/octet-stream',
        };
        $payload[$fileField] = new CURLFile($filePath, $mimeType, $fileName ?? basename($filePath));

        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_POST => true,
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_POSTFIELDS => $payload,
            CURLOPT_TIMEOUT => 30,
        ]);

        $body = curl_exec($ch);
        $error = curl_error($ch);

        return [
            'ok' => $body !== false,
            'error' => $body === false ? $error : null,
            'body' => $body !== false ? $body : null,
        ];
    }

    return [
        'ok' => false,
        'error' => 'Multipart-Versand ist ohne curl nicht verfuegbar.',
        'body' => null,
    ];
}


function telegramSendBotMessage(array $telegramConfig, string $chatId, string $messageText): bool
{
    $botToken = trim((string) ($telegramConfig['bot_token'] ?? ''));
    if ($botToken === '' || $chatId === '' || $messageText === '') {
        return false;
    }

    $response = telegramHttpPostJson(
        'https://api.telegram.org/bot' . $botToken . '/sendMessage',
        [
            'chat_id' => $chatId,
            'text' => appendTelegramServiceFooter($messageText),
        ]
    );

    return (bool) ($response['ok'] ?? false);
}


function telegramSendBotDocument(array $telegramConfig, string $chatId, string $filePath, string $caption = ''): bool
{
    $botToken = trim((string) ($telegramConfig['bot_token'] ?? ''));
    if ($botToken === '' || $chatId === '' || !is_file($filePath)) {
        return false;
    }

    $response = telegramHttpPostMultipart(
        'https://api.telegram.org/bot' . $botToken . '/sendDocument',
        [
            'chat_id' => $chatId,
            'caption' => appendTelegramServiceFooter($caption),
        ],
        'document',
        $filePath,
        basename($filePath)
    );

    return (bool) ($response['ok'] ?? false);
}


function telegramSendBotPhoto(array $telegramConfig, string $chatId, string $filePath, string $caption = ''): bool
{
    $botToken = trim((string) ($telegramConfig['bot_token'] ?? ''));
    if ($botToken === '' || $chatId === '' || !is_file($filePath)) {
        return false;
    }

    $response = telegramHttpPostMultipart(
        'https://api.telegram.org/bot' . $botToken . '/sendPhoto',
        [
            'chat_id' => $chatId,
            'caption' => appendTelegramServiceFooter($caption),
        ],
        'photo',
        $filePath,
        basename($filePath)
    );

    return (bool) ($response['ok'] ?? false);
}