<?php
/**
 * Android app API endpoint.
 *
 * GET (no params)                -> ordered questionnaire list with conditions
 * GET ?id=<questionnaireID>      -> single questionnaire in app JSON format
 * GET ?translations=1            -> global app UI strings only; **no auth** (login screen).
 *
 * POST (coach interview upload) is handled by api/index.php -> handlers/app_questionnaires.php
 */
require_once __DIR__ . '/../common.php';
require_once __DIR__ . '/../db_init.php';
require_once __DIR__ . '/../lib/response.php';

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

$method = $_SERVER['REQUEST_METHOD'];

if ($method === 'GET' && !empty($_GET['translations'])) {
    [$pdo, $tmpDb, $lockFp] = qdb_open(false);
    json_success(['translations' => qdb_build_app_translations_map($pdo)]);
    qdb_discard($tmpDb, $lockFp);
    exit;
}

$tokenRec = require_valid_token();

if ($method !== 'GET') {
    json_error('METHOD_NOT_ALLOWED', 'Method not allowed', 405);
}

[$pdo, $tmpDb, $lockFp] = qdb_open(false);

$qnID = $_GET['id'] ?? '';

if ($qnID) {
    // Single questionnaire in app JSON format
    $qn = $pdo->prepare("SELECT * FROM questionnaire WHERE questionnaireID = :id");
    $qn->execute([':id' => $qnID]);
    $qnRow = $qn->fetch(PDO::FETCH_ASSOC);
    if (!$qnRow) {
        qdb_discard($tmpDb, $lockFp);
        http_response_code(404);
        echo json_encode(["error" => "Questionnaire not found"]);
        exit;
    }

    $stmt = $pdo->prepare("
        SELECT questionID, defaultText, type, orderIndex, configJson
        FROM question WHERE questionnaireID = :id ORDER BY orderIndex
    ");
    $stmt->execute([':id' => $qnID]);
    $dbQuestions = $stmt->fetchAll(PDO::FETCH_ASSOC);

    $questions = [];
    foreach ($dbQuestions as $dbQ) {
        $localId = $dbQ['questionID'];
        $parts = explode('__', $localId);
        $shortId = end($parts);

        $layout = $dbQ['type'];
        $config = qdb_parse_config_json($dbQ['configJson']);
        $qKey = qdb_question_key($config, $dbQ['defaultText']);

        $q = [
            'id'       => $shortId,
            'layout'   => $layout,
            'question' => $qKey !== '' ? $qKey : $dbQ['defaultText'],
        ];

        if ($qKey !== '' && !empty($config['noteBefore'])) {
            $q['noteBeforeKey'] = qdb_note_before_key($qKey);
        }
        if ($qKey !== '' && !empty($config['noteAfter'])) {
            $q['noteAfterKey'] = qdb_note_after_key($qKey);
        }
        if (isset($config['textKey']))     $q['textKey']     = $config['textKey'];
        if (isset($config['textKey1']))    $q['textKey1']    = $config['textKey1'];
        if (isset($config['textKey2']))    $q['textKey2']    = $config['textKey2'];
        if (isset($config['hint']))        $q['hint']        = $config['hint'];
        if (isset($config['hint1']))       $q['hint1']       = $config['hint1'];
        if (isset($config['hint2']))       $q['hint2']       = $config['hint2'];
        if (isset($config['symptoms']))    $q['symptoms']    = $config['symptoms'];
        if (isset($config['scaleType']))   $q['scaleType']   = $config['scaleType'];
        if (isset($config['range']))       $q['range']       = $config['range'];
        if (isset($config['step']))        $q['step']        = (int)$config['step'];
        if (isset($config['unitLabel']))   $q['unitLabel']   = $config['unitLabel'];
        if (isset($config['constraints'])) $q['constraints'] = $config['constraints'];
        if (isset($config['precision']))   $q['precision']   = $config['precision'];
        if (isset($config['minSelection'])) $q['minSelection'] = $config['minSelection'];
        if (isset($config['maxLength']))    $q['maxLength']    = (int)$config['maxLength'];
        if (isset($config['nextQuestionId']))        $q['nextQuestionId']        = $config['nextQuestionId'];
        if (isset($config['otherNextQuestionId'])) $q['otherNextQuestionId'] = $config['otherNextQuestionId'];
        if (isset($config['otherOptionKey']))      $q['otherOptionKey']      = $config['otherOptionKey'];

        if ($layout === 'string_spinner' && isset($config['options'])) {
            $q['options'] = $config['options'];
        }
        if (($layout === 'value_spinner' || $layout === 'slider_question') && isset($config['valueOptions'])) {
            $q['options'] = $config['valueOptions'];
        }

        // Answer options (for radio_question, multi_check_box_question, etc.)
        $ao = $pdo->prepare("
            SELECT defaultText, points, nextQuestionId
            FROM answer_option WHERE questionID = :qid ORDER BY orderIndex
        ");
        $ao->execute([':qid' => $dbQ['questionID']]);
        $opts = $ao->fetchAll(PDO::FETCH_ASSOC);

        if ($opts) {
            $optionsArr = [];
            $pointsMap = [];
            foreach ($opts as $opt) {
                $o = ['key' => $opt['defaultText']];
                if ($opt['nextQuestionId'] !== '') {
                    $o['nextQuestionId'] = $opt['nextQuestionId'];
                }
                $optionsArr[] = $o;
                $pointsMap[$opt['defaultText']] = (int)$opt['points'];
            }
            $q['options'] = $optionsArr;

            $hasNonZero = false;
            foreach ($pointsMap as $v) { if ($v !== 0) { $hasNonZero = true; break; } }
            $q['pointsMap'] = $pointsMap;
        }

        $questions[] = $q;
    }

    qdb_discard($tmpDb, $lockFp);
    echo json_encode([
        'meta'         => ['id' => $qnID],
        'questions'    => $questions,
        'translations' => qdb_build_questionnaire_translations_map($pdo, $qnID),
    ]);
    exit;
}

// Default: ordered questionnaire list
$rows = $pdo->query("
    SELECT questionnaireID, name, showPoints, conditionJson
    FROM questionnaire
    WHERE state = 'active'
    ORDER BY orderIndex
")->fetchAll(PDO::FETCH_ASSOC);

$list = [];
foreach ($rows as $r) {
    $list[] = [
        'id'        => $r['questionnaireID'],
        'name'      => $r['name'],
        'showPoints' => (bool)(int)$r['showPoints'],
        'condition'  => json_decode($r['conditionJson'], true) ?: new stdClass(),
    ];
}

qdb_discard($tmpDb, $lockFp);
echo json_encode($list);