nat-as-server/handlers/answer_options.php

<?php

$tokenRec = require_valid_token();
$method   = $_SERVER['REQUEST_METHOD'];

switch ($method) {

case 'GET':
    $qID = $_GET['questionID'] ?? '';
    if (!$qID) {
        json_error('MISSING_PARAM', 'questionID query param required', 400);
    }
    [$pdo, $tmpDb, $lockFp] = qdb_open(false);
    $stmt = $pdo->prepare('SELECT answerOptionID, questionID, defaultText, points, orderIndex, nextQuestionId FROM answer_option WHERE questionID = :qid ORDER BY orderIndex');
    $stmt->execute([':qid' => $qID]);
    $options = $stmt->fetchAll(PDO::FETCH_ASSOC);
    foreach ($options as &$o) {
        $o['points']     = (int)$o['points'];
        $o['orderIndex'] = (int)$o['orderIndex'];
        $tr = $pdo->prepare('SELECT languageCode, text FROM answer_option_translation WHERE answerOptionID = :id');
        $tr->execute([':id' => $o['answerOptionID']]);
        $o['translations'] = $tr->fetchAll(PDO::FETCH_ASSOC);
    }
    unset($o);
    qdb_discard($tmpDb, $lockFp);
    json_success(['answerOptions' => $options]);
    break;

case 'POST':
    require_role(['admin', 'supervisor'], $tokenRec);
    $body = read_json_body();
    if (empty($body['questionID']) || !isset($body['defaultText'])) {
        json_error('MISSING_FIELDS', 'questionID and defaultText required', 400);
    }
    $id   = bin2hex(random_bytes(16));
    $qID  = $body['questionID'];
    $text = trim($body['defaultText']);
    $points = (int)($body['points'] ?? 0);
    $order  = (int)($body['orderIndex'] ?? 0);
    $nextQ  = trim($body['nextQuestionId'] ?? '');

    [$pdo, $tmpDb, $lockFp] = qdb_open(true);
    try {
        $chk = $pdo->prepare('SELECT 1 FROM question WHERE questionID = :id');
        $chk->execute([':id' => $qID]);
        if (!$chk->fetch()) {
            qdb_discard($tmpDb, $lockFp);
            json_error('NOT_FOUND', 'Question not found', 404);
        }
        if ($order === 0) {
            $max = $pdo->prepare('SELECT COALESCE(MAX(orderIndex),0)+1 FROM answer_option WHERE questionID = :id');
            $max->execute([':id' => $qID]);
            $order = (int)$max->fetchColumn();
        }
        $pdo->prepare('INSERT INTO answer_option (answerOptionID, questionID, defaultText, points, orderIndex, nextQuestionId) VALUES (:id, :qid, :t, :p, :o, :nq)')
            ->execute([':id' => $id, ':qid' => $qID, ':t' => $text, ':p' => $points, ':o' => $order, ':nq' => $nextQ]);
        qdb_save($tmpDb, $lockFp);
        json_success(['answerOption' => [
            'answerOptionID' => $id,
            'questionID'     => $qID,
            'defaultText'    => $text,
            'points'         => $points,
            'orderIndex'     => $order,
            'nextQuestionId' => $nextQ,
            'translations'   => [],
        ]]);
    } catch (Throwable $e) {
        qdb_discard($tmpDb, $lockFp);
        error_log($e->getMessage());
        json_error('SERVER_ERROR', 'Server error', 500);
    }
    break;

case 'PUT':
    require_role(['admin', 'supervisor'], $tokenRec);
    $body = read_json_body();
    if (empty($body['answerOptionID'])) {
        json_error('MISSING_FIELDS', 'answerOptionID is required', 400);
    }
    $id = $body['answerOptionID'];

    [$pdo, $tmpDb, $lockFp] = qdb_open(true);
    try {
        $existing = $pdo->prepare('SELECT * FROM answer_option WHERE answerOptionID = :id');
        $existing->execute([':id' => $id]);
        $row = $existing->fetch(PDO::FETCH_ASSOC);
        if (!$row) {
            qdb_discard($tmpDb, $lockFp);
            json_error('NOT_FOUND', 'Answer option not found', 404);
        }
        $text   = trim($body['defaultText'] ?? $row['defaultText']);
        $points = (int)($body['points'] ?? $row['points']);
        $order  = (int)($body['orderIndex'] ?? $row['orderIndex']);
        $nextQ  = trim($body['nextQuestionId'] ?? $row['nextQuestionId']);

        $pdo->prepare('UPDATE answer_option SET defaultText = :t, points = :p, orderIndex = :o, nextQuestionId = :nq WHERE answerOptionID = :id')
            ->execute([':t' => $text, ':p' => $points, ':o' => $order, ':nq' => $nextQ, ':id' => $id]);
        qdb_save($tmpDb, $lockFp);
        json_success(['answerOption' => [
            'answerOptionID' => $id,
            'questionID'     => $row['questionID'],
            'defaultText'    => $text,
            'points'         => $points,
            'orderIndex'     => $order,
            'nextQuestionId' => $nextQ,
        ]]);
    } catch (Throwable $e) {
        qdb_discard($tmpDb, $lockFp);
        error_log($e->getMessage());
        json_error('SERVER_ERROR', 'Server error', 500);
    }
    break;

case 'DELETE':
    require_role(['admin', 'supervisor'], $tokenRec);
    $body = read_json_body();
    if (empty($body['answerOptionID'])) {
        json_error('MISSING_FIELDS', 'answerOptionID is required', 400);
    }
    $id = $body['answerOptionID'];

    [$pdo, $tmpDb, $lockFp] = qdb_open(true);
    try {
        $pdo->exec('PRAGMA foreign_keys = OFF;');
        $pdo->beginTransaction();
        $pdo->prepare('DELETE FROM answer_option_translation WHERE answerOptionID = :id')->execute([':id' => $id]);
        $pdo->prepare('UPDATE client_answer SET answerOptionID = NULL WHERE answerOptionID = :id')->execute([':id' => $id]);
        $pdo->prepare('DELETE FROM answer_option WHERE answerOptionID = :id')->execute([':id' => $id]);
        $pdo->commit();
        $pdo->exec('PRAGMA foreign_keys = ON;');
        qdb_save($tmpDb, $lockFp);
        json_success(['deleted' => true]);
    } catch (Throwable $e) {
        if ($pdo->inTransaction()) {
            $pdo->rollBack();
        }
        qdb_discard($tmpDb, $lockFp);
        error_log($e->getMessage());
        json_error('SERVER_ERROR', 'Server error', 500);
    }
    break;

case 'PATCH':
    require_role(['admin', 'supervisor'], $tokenRec);
    $body = read_json_body();
    if (empty($body['questionID']) || !is_array($body['order'] ?? null)) {
        json_error('MISSING_FIELDS', 'questionID and order[] required', 400);
    }
    [$pdo, $tmpDb, $lockFp] = qdb_open(true);
    try {
        $stmt = $pdo->prepare('UPDATE answer_option SET orderIndex = :o WHERE answerOptionID = :id AND questionID = :qid');
        foreach ($body['order'] as $idx => $aoid) {
            $stmt->execute([':o' => $idx, ':id' => $aoid, ':qid' => $body['questionID']]);
        }
        qdb_save($tmpDb, $lockFp);
        json_success(['reordered' => true]);
    } catch (Throwable $e) {
        qdb_discard($tmpDb, $lockFp);
        error_log($e->getMessage());
        json_error('SERVER_ERROR', 'Server error', 500);
    }
    break;

default:
    json_error('METHOD_NOT_ALLOWED', 'Method not allowed', 405);
}