<?php
header('Content-Type: application/json');

$response = ['status' => 'error', 'message' => 'Something went wrong'];

if (isset($_FILES['doc_file']) && $_FILES['doc_file']['error'] === 0) {
    $uploadDir = realpath(__DIR__ . '/../uploads') . '/';
    $outputDir = realpath(__DIR__ . '/../converted') . '/';

    if (!is_dir($uploadDir)) mkdir($uploadDir, 0755, true);
    if (!is_dir($outputDir)) mkdir($outputDir, 0755, true);

    $originalName = uniqid('docx_') . '.docx';
    $originalPath = $uploadDir . $originalName;
    move_uploaded_file($_FILES['doc_file']['tmp_name'], $originalPath);

    $librePath = '/usr/bin/libreoffice'; // adjust path if needed
    $cmd = escapeshellcmd("$librePath --headless --convert-to pdf --outdir " . escapeshellarg($outputDir) . " " . escapeshellarg($originalPath));
    exec($cmd . " 2>&1", $output, $returnCode);

    $convertedFile = $outputDir . pathinfo($originalName, PATHINFO_FILENAME) . '.pdf';

    $baseUrl = ($_SERVER['HTTPS'] ? "https://" : "http://") . $_SERVER['HTTP_HOST'] . dirname($_SERVER['SCRIPT_NAME'], 2);
    $downloadUrl = rtrim($baseUrl, '/') . '/converted/' . basename($convertedFile);

    if ($returnCode === 0 && file_exists($convertedFile)) {
        $response = [
            'status' => 'success',
            'download_url' => $downloadUrl
        ];
    } else {
        $response['message'] = 'Conversion failed';
        $response['debug'] = [
            'cmd' => $cmd,
            'output' => $output,
            'code' => $returnCode
        ];
    }
} else {
    $response['message'] = 'No valid DOCX file uploaded.';
}

echo json_encode($response);