<?php
require_once __DIR__.'/auth_guard.php';
// Subida de paquete SCORM (.zip): descomprime en data/scormpkg y devuelve la URL de index.html
require_once "../config.php";

header('Content-Type: application/json; charset=utf-8');

$return = new stdClass();

function responder($return) {
    echo json_encode($return, JSON_UNESCAPED_UNICODE);
    exit;
}

function slugScorm($text) {
    $text = trim((string)$text);
    $text = strtr($text, array(
        'á'=>'a','à'=>'a','ä'=>'a','â'=>'a','Á'=>'A','À'=>'A','Ä'=>'A','Â'=>'A',
        'é'=>'e','è'=>'e','ë'=>'e','ê'=>'e','É'=>'E','È'=>'E','Ë'=>'E','Ê'=>'E',
        'í'=>'i','ì'=>'i','ï'=>'i','î'=>'i','Í'=>'I','Ì'=>'I','Ï'=>'I','Î'=>'I',
        'ó'=>'o','ò'=>'o','ö'=>'o','ô'=>'o','Ó'=>'O','Ò'=>'O','Ö'=>'O','Ô'=>'O',
        'ú'=>'u','ù'=>'u','ü'=>'u','û'=>'u','Ú'=>'U','Ù'=>'U','Ü'=>'U','Û'=>'U',
        'ñ'=>'n','Ñ'=>'N'
    ));
    $text = strtolower($text);
    $text = preg_replace('~[^a-z0-9]+~', '-', $text);
    $text = trim($text, '-');
    if ($text === '') { $text = 'scorm'; }
    return substr($text, 0, 60);
}

function limpiarRuta($p) {
    $p = str_replace('\\', '/', $p);
    $absoluta = (substr($p, 0, 1) === '/');
    $parts = array();
    foreach (explode('/', $p) as $seg) {
        if ($seg === '' || $seg === '.') continue;
        if ($seg === '..') { array_pop($parts); continue; }
        $parts[] = $seg;
    }
    return ($absoluta ? '/' : '') . implode('/', $parts);
}

function buscarArchivoCI($dir, $nombre) {
    $items = @scandir($dir);
    if (!$items) return null;
    foreach ($items as $it) {
        if ($it === '.' || $it === '..') continue;
        if (strcasecmp($it, $nombre) === 0 && is_file($dir . '/' . $it)) return $dir . '/' . $it;
    }
    return null;
}

function primerHtml($dir) {
    $items = @scandir($dir);
    if (!$items) return null;
    foreach ($items as $it) {
        if ($it === '.' || $it === '..') continue;
        $p = $dir . '/' . $it;
        if (is_file($p) && preg_match('~\.html?$~i', $it)) return $p;
    }
    return null;
}

function hrefDeManifest($manifest) {
    $doc = new DOMDocument();
    libxml_use_internal_errors(true);
    $ok = @$doc->load($manifest);
    libxml_clear_errors();
    if (!$ok) return null;

    $defaultOrg = '';
    foreach ($doc->getElementsByTagName('organizations') as $orgs) {
        $defaultOrg = $orgs->getAttribute('default');
        break;
    }

    $ref = '';
    foreach ($doc->getElementsByTagName('organization') as $org) {
        if ($defaultOrg !== '' && $org->getAttribute('identifier') !== $defaultOrg) continue;
        foreach ($org->getElementsByTagName('item') as $item) {
            $ir = $item->getAttribute('identifierref');
            if ($ir !== '') { $ref = $ir; break 2; }
        }
        if ($defaultOrg !== '') break;
    }

    $resources = $doc->getElementsByTagName('resource');
    $href = '';
    if ($ref !== '') {
        foreach ($resources as $res) {
            if ($res->getAttribute('identifier') === $ref) { $href = $res->getAttribute('href'); break; }
        }
    }
    if ($href === '') {
        foreach ($resources as $res) {
            $st = $res->getAttribute('adlcp:scormtype');
            if ($st === '') { $st = $res->getAttributeNS('http://www.adlnet.org/xsd/adlcp_rootv1p2', 'scormtype'); }
            if (strtolower($st) === 'sco') { $href = $res->getAttribute('href'); break; }
        }
    }
    if ($href === '') {
        foreach ($resources as $res) {
            $h = $res->getAttribute('href');
            if ($h !== '') { $href = $h; break; }
        }
    }
    return ($href !== '') ? $href : null;
}

function detectarEntrada($dest) {
    // 1) imsmanifest.xml (raíz o un nivel dentro)
    $manifests = array();
    if (is_file($dest . '/imsmanifest.xml')) $manifests[] = $dest . '/imsmanifest.xml';
    foreach (glob($dest . '/*', GLOB_ONLYDIR) as $sub) {
        if (is_file($sub . '/imsmanifest.xml')) $manifests[] = $sub . '/imsmanifest.xml';
    }
    foreach ($manifests as $manifest) {
        $href = hrefDeManifest($manifest);
        if ($href) {
            $cand = limpiarRuta(dirname($manifest) . '/' . urldecode($href));
            if (is_file($cand)) return $cand;
        }
    }

    // 2) nombres comunes (Storyline index_lms.html / story.html, Rise/HTML index.html, etc.)
    $nombres = array('index.html', 'index_lms.html', 'story.html', 'storyline.html', 'launch.html',
                     'scorm.html', 'scormindex.html', 'default.html', 'start.html', 'index.htm');
    $dirs = array($dest);
    foreach (glob($dest . '/*', GLOB_ONLYDIR) as $sub) { $dirs[] = $sub; }
    foreach ($nombres as $n) {
        foreach ($dirs as $d) {
            $p = buscarArchivoCI($d, $n);
            if ($p) return $p;
        }
    }

    // 3) primer .html/.htm
    foreach ($dirs as $d) {
        $p = primerHtml($d);
        if ($p) return $p;
    }
    return null;
}

function rrmdir($dir) {
    if (!is_dir($dir)) return;
    $items = @scandir($dir);
    if (!$items) return;
    foreach ($items as $it) {
        if ($it === '.' || $it === '..') continue;
        $p = $dir . '/' . $it;
        if (is_dir($p)) { rrmdir($p); } else { @unlink($p); }
    }
    @rmdir($dir);
}

if (!isset($_FILES['files']) || !is_array($_FILES['files']['tmp_name'])) {
    $return->error = '1'; $return->txt = 'No se recibió ningún archivo.';
    responder($return);
}

$tmp = $_FILES['files']['tmp_name'][0];
$errCode = isset($_FILES['files']['error'][0]) ? $_FILES['files']['error'][0] : 1;
$orig = '';
if (!empty($_FILES['files']['name'][0])) { $orig = $_FILES['files']['name'][0]; }
elseif (!empty($_POST['name'])) { $orig = $_POST['name']; }

if ($errCode !== 0) {
    $return->error = '1'; $return->txt = 'Error al subir el archivo (código ' . $errCode . ').';
    responder($return);
}

$ext = strtolower(pathinfo($orig, PATHINFO_EXTENSION));
if ($ext !== 'zip') {
    $return->error = '1'; $return->txt = 'Solo se aceptan paquetes SCORM en formato .zip';
    responder($return);
}

$fh = @fopen($tmp, 'rb');
$magic = $fh ? fread($fh, 4) : '';
if ($fh) { fclose($fh); }
if (substr($magic, 0, 2) !== 'PK') {
    $return->error = '1'; $return->txt = 'El archivo no es un ZIP válido.';
    responder($return);
}

$scormBase = dirname(__DIR__) . '/data/scormpkg';
if (!is_dir($scormBase)) { @mkdir($scormBase, 0775, true); }
if (!is_dir($scormBase) || !is_writable($scormBase)) {
    $return->error = '1'; $return->txt = 'La carpeta data/scormpkg no existe o no tiene permisos de escritura.';
    responder($return);
}

$catSlug = 'general';
if (!empty($_POST['catid'])) {
    $cid = intval($_POST['catid']);
    if ($cid > 0) {
        dbConnect();
        global $link;
        $resCat = mysqli_query($link, "select nombre from categoria where id = $cid limit 1");
        if ($resCat && ($rowCat = mysqli_fetch_row($resCat))) {
            $catSlug = slugScorm($rowCat[0]);
        }
        if ($resCat) { mysqli_free_result($resCat); }
        mysqli_close($link);
    }
}

$destBase = $scormBase . '/' . $catSlug;
if (!is_dir($destBase)) { @mkdir($destBase, 0775, true); }
if (!is_dir($destBase) || !is_writable($destBase)) {
    $return->error = '1'; $return->txt = 'No se pudo crear la carpeta de la categoría en data/scormpkg.';
    responder($return);
}

$slug = slugScorm(pathinfo($orig, PATHINFO_FILENAME));
$folder = $slug . '_' . time();
$dest = $destBase . '/' . $folder;
$i = 1;
while (file_exists($dest)) { $folder = $slug . '_' . time() . '_' . $i; $dest = $destBase . '/' . $folder; $i++; }

$zip = new ZipArchive();
if ($zip->open($tmp) !== true) {
    $return->error = '1'; $return->txt = 'No se pudo abrir el paquete .zip';
    responder($return);
}

$totalSize = 0; $numEntries = 0;
for ($idx = 0; $idx < $zip->numFiles; $idx++) {
    $stat = $zip->statIndex($idx);
    $name = $stat['name'];
    $numEntries++;
    $totalSize += $stat['size'];
    if (preg_match('~^(/|\\\\|[A-Za-z]:)~', $name) || strpos($name, '..') !== false) {
        $zip->close();
        $return->error = '1'; $return->txt = 'El .zip contiene rutas no permitidas.';
        responder($return);
    }
    if ($numEntries > 20000 || $totalSize > 2147483648) {
        $zip->close();
        $return->error = '1'; $return->txt = 'El paquete es demasiado grande.';
        responder($return);
    }
}

if (!@mkdir($dest, 0775, true)) {
    $zip->close();
    $return->error = '1'; $return->txt = 'No se pudo crear la carpeta destino.';
    responder($return);
}

if (!$zip->extractTo($dest)) {
    $zip->close();
    rrmdir($dest);
    $return->error = '1'; $return->txt = 'No se pudo descomprimir el paquete.';
    responder($return);
}
$zip->close();

$indexPath = detectarEntrada($dest);
if (!$indexPath) {
    rrmdir($dest);
    $return->error = '1'; $return->txt = 'No se encontró un archivo de inicio (index.html / imsmanifest.xml) en el paquete SCORM.';
    responder($return);
}

$baseReal = realpath($scormBase);
$indexReal = realpath($indexPath);
$rel = ltrim(str_replace('\\', '/', substr($indexReal, strlen($baseReal))), '/');

$return->error = '0';
$return->category = $catSlug;
$return->folder = $catSlug . '/' . $folder;
$return->url = $CFG->wwwroot . 'data/scormpkg/' . $rel;
responder($return);
?>