<?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            -> all translations merged across all tables
 *
 * 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';

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

$tokenRec = require_valid_token();

if ($_SERVER['REQUEST_METHOD'] !== 'GET') {
    http_response_code(405);
    echo json_encode(["error" => "Method not allowed"]);
    exit;
}

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

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

if ($translations) {
    // Return all translations merged from all three tables, keyed by language
    $result = [];

    // question translations: map questionID -> defaultText (the key), then lang -> text
    $rows = $pdo->query("
        SELECT q.defaultText AS stringKey, qt.languageCode, qt.text
        FROM question_translation qt
        JOIN question q ON q.questionID = qt.questionID
    ")->fetchAll(PDO::FETCH_ASSOC);
    foreach ($rows as $r) {
        $result[$r['languageCode']][$r['stringKey']] = $r['text'];
    }

    // answer option translations: map answerOptionID -> defaultText (the key)
    $rows = $pdo->query("
        SELECT ao.defaultText AS stringKey, aot.languageCode, aot.text
        FROM answer_option_translation aot
        JOIN answer_option ao ON ao.answerOptionID = aot.answerOptionID
    ")->fetchAll(PDO::FETCH_ASSOC);
    foreach ($rows as $r) {
        $result[$r['languageCode']][$r['stringKey']] = $r['text'];
    }

    // string translations (symptoms, hints, textKeys, etc.)
    $rows = $pdo->query("SELECT stringKey, languageCode, text FROM string_translation")->fetchAll(PDO::FETCH_ASSOC);
    foreach ($rows as $r) {
        $result[$r['languageCode']][$r['stringKey']] = $r['text'];
    }

    qdb_discard($tmpDb, $lockFp);
    echo json_encode(["success" => true, "translations" => $result]);
    exit;
}

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'];
        $config = json_decode($dbQ['configJson'], true) ?: [];

        $q = [
            'id'       => $shortId,
            'layout'   => $layout,
            'question' => $dbQ['defaultText'],
        ];

        // Add type-specific config fields back to the top level
        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['range']))       $q['range']       = $config['range'];
        if (isset($config['constraints'])) $q['constraints'] = $config['constraints'];
        if (isset($config['minSelection'])) $q['minSelection'] = $config['minSelection'];

        // String spinner static options
        if ($layout === 'string_spinner' && isset($config['options'])) {
            $q['options'] = $config['options'];
        }

        // Value spinner conditional navigation options
        if ($layout === 'value_spinner' && isset($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,
    ]);
    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);