<?php
require __DIR__ . '/_bootstrap.php';

/**
 * @OA\Get(
 *   path="/document-file.php",
 *   tags={"Documents"},
 *   summary="Download an uploaded file",
 *   description="Access: home/owner owner or accepted share.",
 *   security={{"bearerAuth":{}}},
 *   @OA\Parameter(name="id", in="query", required=true, @OA\Schema(type="integer"),
 *     description="doc_storage.id"),
 *   @OA\Response(response=200, description="Binary file",
 *     @OA\MediaType(mediaType="application/octet-stream",
 *       @OA\Schema(type="string", format="binary"))),
 *   @OA\Response(response=403, ref="#/components/responses/Forbidden"),
 *   @OA\Response(response=404, ref="#/components/responses/NotFound")
 * )
 */
require_method('GET');
$user   = require_auth($pdo);
$config = require __DIR__ . '/config.php';
$id     = (int) query('id', 0);

if ($id <= 0) {
    json_error(422, 'id is required');
}

$stmt = $pdo->prepare('SELECT * FROM doc_storage WHERE id = ? LIMIT 1');
$stmt->execute([$id]);
$file = $stmt->fetch();

if (!$file) {
    json_error(404, 'File not found');
}

// Access check: home file or owner file.
$allowed = false;
if (!empty($file['idhome'])) {
    $allowed = user_can_access_home($pdo, $user, (int) $file['idhome']);
    $baseDir = $config['homedocs_dir'];
} elseif (!empty($file['owner_id'])) {
    $allowed = user_owns_owner($pdo, $user, (int) $file['owner_id']);
    $baseDir = $config['persondocs_dir'];
}

if (!$allowed) {
    json_error(403, 'No access to this file');
}

$path = ($baseDir ?? '') . '/' . basename((string) $file['filename']);
if (!is_file($path)) {
    json_error(404, 'File missing on disk');
}

// Serve the binary file (override bootstrap JSON header).
header('Content-Type: ' . (mime_content_type($path) ?: 'application/octet-stream'));
header('Content-Disposition: attachment; filename="' . basename((string) $file['filename']) . '"');
header('Content-Length: ' . filesize($path));
readfile($path);
exit;