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

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

// Check if file was uploaded
if (isset($_FILES['pdf_file']) && $_FILES['pdf_file']['error'] === 0) {
    // Set directory paths
    $uploadDir = __DIR__ . '/../uploads/';
    $outputDir = __DIR__ . '/../converted/';

    // Ensure directories exist
    if (!is_dir($uploadDir)) mkdir($uploadDir, 0755, true);
    if (!is_dir($outputDir)) mkdir($outputDir, 0755, true);

    // Save uploaded file
    $originalName = uniqid('pdf_') . '.pdf';
    $originalPath = $uploadDir . $originalName;
    move_uploaded_file($_FILES['pdf_file']['tmp_name'], $originalPath);

    // LibreOffice path
    $librePath = '/usr/bin/libreoffice'; // change if needed

    // Execute command
    $cmd = escapeshellcmd("$librePath --headless --convert-to docx --outdir " . escapeshellarg($outputDir) . " " . escapeshellarg($originalPath));
    exec($cmd . ' 2>&1', $output, $returnCode);

    // Expected output file
    $convertedFile = $outputDir . pathinfo($originalPath, PATHINFO_FILENAME) . '.docx';
    $convertedURL = '../converted/' . basename($convertedFile);

    if ($returnCode === 0 && file_exists($convertedFile)) {
        $response = [
            'status' => 'success',
            'download_url' => $convertedURL
        ];
    } else {
        $response['message'] = 'Conversion failed';
        $response['debug'] = [
            'cmd' => $cmd,
            'output' => $output,
            'code' => $returnCode
        ];

        file_put_contents(__DIR__ . '/../debug.log', "CMD: $cmd\nReturn Code: $returnCode\nOutput:\n" . implode("\n", $output) . "\n\n", FILE_APPEND);
    }
} else {
    $response['message'] = 'No valid file uploaded.';
}

echo json_encode($response);