<?PHP
/**
 * Generates a CSV template based on the field list provided for CSVXML.
 *
 * @author Joshua Ramon Enslin <joshua@museum-digital.de>
 */
declare(strict_types = 1);
error_reporting(E_ALL);
ini_set('display_errors', "1");

require_once __DIR__ . "/functions/functions.php";

if (session_status() != PHP_SESSION_ACTIVE) {
    session_start();
}

// This array contains all available languages
$allowed_langs = ['ar', 'de', 'en', 'hu', 'id', 'it', 'pl','pt'];

// Some languages are in translation. They will only be available for logged in users.

if (isset($_GET['navlang'])) {
    $_SESSION['lang'] = $_GET['navlang'];
    if (!in_array($_SESSION['lang'], $allowed_langs)) $_SESSION['lang'] = 'de';
}
else if (!isset($_SESSION['lang'])) {
    $_SESSION['lang'] = lang_getfrombrowser($allowed_langs, 'en', "", false);
}
$lang = $_SESSION['lang'];

if (!empty($_POST) and !empty($_POST['selectedFields'])) {
    $selectionActive = true;
    $selectedFields = explode(",", trim($_POST['selectedFields'], ","));
}
else $selectionActive = false;

require __DIR__ . "/values/availableFields.php";

$line1 = $line2 = $line3 = $line4 = [];

foreach ($availableFields as $headline => $fields) {

    $i = 0;
    $tLine1 = $tLine2 = $tLine3 = $tLine4 = [];
    $tLine1[] = $headline;

    foreach($fields as $fieldName => $field) {

        if ($selectionActive === true and !in_array($fieldName, $selectedFields)) {
            continue;
        }

        if ($i !== 0) $tLine1[] = "";
        $tLine2[] = $fieldName;
        $tLine3[] = $field['name_human_readable'];
        # $tLine4[] = $field['remark'];
        if (!empty($field['allowedValues'])) $tLine4[] = end($field['allowedValues']);
        else $tLine4[] = $field['name_human_readable'];
        
        $i++;
    }

    if (empty($tLine2) or count($tLine2) === 0) continue;

    for ($i = 1; $i <= 4; $i++) {
        ${"line$i"} = array_merge(${"line$i"}, ${"tLine$i"});
    }

}

header('Content-Type: text/csv; charset=utf-8');
if ($selectionActive === true)
    header("Content-Disposition: attachment; filename=csvxml_museum-digital_template-{$lang}_selection.csv");
else
    header("Content-Disposition: attachment; filename=csvxml_museum-digital_template-{$lang}.csv");

for ($i = 2; $i <= 4; $i++) {
    echo mb_convert_encoding('"' . implode("\";\"", ${"line$i"}) . '"' . PHP_EOL, 'utf-16','utf-8');;
}