<?php
require_once __DIR__ . '/../common.php';
require_once __DIR__ . '/../db_init.php';

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

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

switch ($method) {

case 'GET':
    [$pdo, $tmpDb, $lockFp] = qdb_open(false);
    $rows = $pdo->query("
        SELECT q.questionnaireID, q.name, q.version, q.state,
               q.orderIndex, q.showPoints, q.conditionJson,
               COUNT(qu.questionID) AS questionCount
        FROM questionnaire q
        LEFT JOIN question qu ON qu.questionnaireID = q.questionnaireID
        GROUP BY q.questionnaireID
        ORDER BY q.orderIndex, q.name
    ")->fetchAll(PDO::FETCH_ASSOC);
    foreach ($rows as &$r) {
        $r['orderIndex']  = (int)$r['orderIndex'];
        $r['showPoints']  = (int)$r['showPoints'];
        $r['conditionJson'] = $r['conditionJson'] ?: '{}';
    }
    unset($r);
    qdb_discard($tmpDb, $lockFp);
    echo json_encode(["success" => true, "questionnaires" => $rows]);
    break;

case 'POST':
    require_role(['admin', 'supervisor'], $tokenRec);
    $body = json_decode(file_get_contents('php://input'), true);
    if (!$body || empty($body['name'])) {
        http_response_code(400);
        echo json_encode(["error" => "name is required"]);
        exit;
    }
    $id        = bin2hex(random_bytes(16));
    $name      = trim($body['name']);
    $version   = trim($body['version'] ?? '');
    $state     = trim($body['state'] ?? 'draft');
    $order     = (int)($body['orderIndex'] ?? 0);
    $showPts   = (int)($body['showPoints'] ?? 0);
    $condJson  = $body['conditionJson'] ?? '{}';

    [$pdo, $tmpDb, $lockFp] = qdb_open(true);
    try {
        if ($order === 0) {
            $order = (int)$pdo->query("SELECT COALESCE(MAX(orderIndex),0)+1 FROM questionnaire")->fetchColumn();
        }
        $pdo->prepare("INSERT INTO questionnaire (questionnaireID, name, version, state, orderIndex, showPoints, conditionJson)
                        VALUES (:id, :n, :v, :s, :o, :sp, :cj)")
            ->execute([':id' => $id, ':n' => $name, ':v' => $version, ':s' => $state,
                       ':o' => $order, ':sp' => $showPts, ':cj' => $condJson]);
        qdb_save($tmpDb, $lockFp);
        echo json_encode(["success" => true, "questionnaire" => [
            "questionnaireID" => $id, "name" => $name, "version" => $version,
            "state" => $state, "orderIndex" => $order, "showPoints" => $showPts,
            "conditionJson" => $condJson, "questionCount" => 0
        ]]);
    } catch (Throwable $e) {
        qdb_discard($tmpDb, $lockFp);
        http_response_code(500);
        error_log($e->getMessage());
        echo json_encode(["error" => "Server error"]);
    }
    break;

case 'PUT':
    require_role(['admin', 'supervisor'], $tokenRec);
    $body = json_decode(file_get_contents('php://input'), true);
    if (!$body || empty($body['questionnaireID'])) {
        http_response_code(400);
        echo json_encode(["error" => "questionnaireID is required"]);
        exit;
    }
    $id = $body['questionnaireID'];

    [$pdo, $tmpDb, $lockFp] = qdb_open(true);
    try {
        $existing = $pdo->prepare("SELECT * FROM questionnaire WHERE questionnaireID = :id");
        $existing->execute([':id' => $id]);
        $row = $existing->fetch(PDO::FETCH_ASSOC);
        if (!$row) {
            qdb_discard($tmpDb, $lockFp);
            http_response_code(404);
            echo json_encode(["error" => "Questionnaire not found"]);
            exit;
        }
        $name    = trim($body['name']    ?? $row['name']);
        $version = trim($body['version'] ?? $row['version']);
        $state   = trim($body['state']   ?? $row['state']);
        $order   = (int)($body['orderIndex']  ?? $row['orderIndex']);
        $showPts = (int)($body['showPoints']  ?? $row['showPoints']);
        $condJson = $body['conditionJson']    ?? $row['conditionJson'];

        $pdo->prepare("UPDATE questionnaire SET name = :n, version = :v, state = :s,
                        orderIndex = :o, showPoints = :sp, conditionJson = :cj
                        WHERE questionnaireID = :id")
            ->execute([':n' => $name, ':v' => $version, ':s' => $state,
                       ':o' => $order, ':sp' => $showPts, ':cj' => $condJson, ':id' => $id]);
        qdb_save($tmpDb, $lockFp);
        echo json_encode(["success" => true, "questionnaire" => [
            "questionnaireID" => $id, "name" => $name, "version" => $version, "state" => $state,
            "orderIndex" => $order, "showPoints" => $showPts, "conditionJson" => $condJson
        ]]);
    } catch (Throwable $e) {
        qdb_discard($tmpDb, $lockFp);
        http_response_code(500);
        error_log($e->getMessage());
        echo json_encode(["error" => "Server error"]);
    }
    break;

case 'DELETE':
    require_role(['admin'], $tokenRec);
    $body = json_decode(file_get_contents('php://input'), true);
    if (!$body || empty($body['questionnaireID'])) {
        http_response_code(400);
        echo json_encode(["error" => "questionnaireID is required"]);
        exit;
    }
    $id = $body['questionnaireID'];

    [$pdo, $tmpDb, $lockFp] = qdb_open(true);
    try {
        $pdo->exec("PRAGMA foreign_keys = OFF;");
        $pdo->beginTransaction();

        // Get question IDs to cascade-delete answer options and translations
        $qIds = $pdo->prepare("SELECT questionID FROM question WHERE questionnaireID = :id");
        $qIds->execute([':id' => $id]);
        $questionIDs = $qIds->fetchAll(PDO::FETCH_COLUMN);

        foreach ($questionIDs as $qid) {
            $aoIds = $pdo->prepare("SELECT answerOptionID FROM answer_option WHERE questionID = :qid");
            $aoIds->execute([':qid' => $qid]);
            $optionIDs = $aoIds->fetchAll(PDO::FETCH_COLUMN);
            foreach ($optionIDs as $aoid) {
                $pdo->prepare("DELETE FROM answer_option_translation WHERE answerOptionID = :id")->execute([':id' => $aoid]);
            }
            $pdo->prepare("DELETE FROM answer_option WHERE questionID = :qid")->execute([':qid' => $qid]);
            $pdo->prepare("DELETE FROM question_translation WHERE questionID = :qid")->execute([':qid' => $qid]);
            $pdo->prepare("DELETE FROM client_answer WHERE questionID = :qid")->execute([':qid' => $qid]);
        }
        $pdo->prepare("DELETE FROM question WHERE questionnaireID = :id")->execute([':id' => $id]);
        $pdo->prepare("DELETE FROM completed_questionnaire WHERE questionnaireID = :id")->execute([':id' => $id]);
        $pdo->prepare("DELETE FROM questionnaire WHERE questionnaireID = :id")->execute([':id' => $id]);

        $pdo->commit();
        $pdo->exec("PRAGMA foreign_keys = ON;");
        qdb_save($tmpDb, $lockFp);
        echo json_encode(["success" => true]);
    } catch (Throwable $e) {
        if ($pdo->inTransaction()) $pdo->rollBack();
        qdb_discard($tmpDb, $lockFp);
        http_response_code(500);
        error_log($e->getMessage());
        echo json_encode(["error" => "Server error"]);
    }
    break;

default:
    http_response_code(405);
    echo json_encode(["error" => "Method not allowed"]);
}