<?php

class QuestionRepo
{
    public static function listByQuestionnaire(PDO $pdo, string $questionnaireID): array
    {
        $stmt = $pdo->prepare("
            SELECT questionID, questionnaireID, defaultText, type, orderIndex, isRequired, configJson
            FROM question WHERE questionnaireID = :qid ORDER BY orderIndex
        ");
        $stmt->execute([':qid' => $questionnaireID]);
        $questions = $stmt->fetchAll(PDO::FETCH_ASSOC);

        foreach ($questions as &$q) {
            $q['isRequired'] = (int) $q['isRequired'];
            $q['orderIndex'] = (int) $q['orderIndex'];
            $q['configJson'] = $q['configJson'] ?: '{}';

            $ao = $pdo->prepare("
                SELECT answerOptionID, questionID, defaultText, points, orderIndex, nextQuestionId
                FROM answer_option WHERE questionID = :qid ORDER BY orderIndex
            ");
            $ao->execute([':qid' => $q['questionID']]);
            $q['answerOptions'] = $ao->fetchAll(PDO::FETCH_ASSOC);
            foreach ($q['answerOptions'] as &$opt) {
                $opt['points'] = (int) $opt['points'];
                $opt['orderIndex'] = (int) $opt['orderIndex'];
            }
            unset($opt);

            $tr = $pdo->prepare(
                'SELECT languageCode, text FROM question_translation WHERE questionID = :qid'
            );
            $tr->execute([':qid' => $q['questionID']]);
            $q['translations'] = $tr->fetchAll(PDO::FETCH_ASSOC);
        }
        unset($q);

        return $questions;
    }

    public static function findById(PDO $pdo, string $questionID): ?array
    {
        $stmt = $pdo->prepare('SELECT * FROM question WHERE questionID = :id');
        $stmt->execute([':id' => $questionID]);
        $row = $stmt->fetch(PDO::FETCH_ASSOC);

        return $row === false ? null : $row;
    }

    public static function create(
        PDO $pdo,
        string $id,
        string $questionnaireID,
        string $defaultText,
        string $type,
        int $orderIndex,
        int $isRequired,
        string $configJson
    ): void {
        $pdo->prepare(
            'INSERT INTO question (questionID, questionnaireID, defaultText, type, orderIndex, isRequired, configJson)
             VALUES (:id, :qid, :t, :ty, :o, :r, :cj)'
        )->execute([
            ':id' => $id,
            ':qid' => $questionnaireID,
            ':t' => $defaultText,
            ':ty' => $type,
            ':o' => $orderIndex,
            ':r' => $isRequired,
            ':cj' => $configJson,
        ]);
    }

    public static function update(
        PDO $pdo,
        string $id,
        string $defaultText,
        string $type,
        int $orderIndex,
        int $isRequired,
        string $configJson
    ): void {
        $pdo->prepare(
            'UPDATE question SET defaultText = :t, type = :ty, orderIndex = :o, isRequired = :r, configJson = :cj
             WHERE questionID = :id'
        )->execute([
            ':t' => $defaultText,
            ':ty' => $type,
            ':o' => $orderIndex,
            ':r' => $isRequired,
            ':cj' => $configJson,
            ':id' => $id,
        ]);
    }

    public static function delete(PDO $pdo, string $id): void
    {
        $pdo->exec('PRAGMA foreign_keys = OFF;');
        $pdo->beginTransaction();
        try {
            $aoIds = $pdo->prepare('SELECT answerOptionID FROM answer_option WHERE questionID = :id');
            $aoIds->execute([':id' => $id]);
            foreach ($aoIds->fetchAll(PDO::FETCH_COLUMN) as $aoid) {
                $pdo->prepare('DELETE FROM answer_option_translation WHERE answerOptionID = :id')
                    ->execute([':id' => $aoid]);
            }
            $pdo->prepare('DELETE FROM answer_option WHERE questionID = :id')->execute([':id' => $id]);
            $pdo->prepare('DELETE FROM question_translation WHERE questionID = :id')->execute([':id' => $id]);
            $pdo->prepare('DELETE FROM client_answer WHERE questionID = :id')->execute([':id' => $id]);
            $pdo->prepare('DELETE FROM question WHERE questionID = :id')->execute([':id' => $id]);
            $pdo->commit();
        } catch (Throwable $e) {
            if ($pdo->inTransaction()) {
                $pdo->rollBack();
            }
            throw $e;
        } finally {
            $pdo->exec('PRAGMA foreign_keys = ON;');
        }
    }

    public static function reorder(PDO $pdo, string $questionnaireID, array $orderedIds): void
    {
        $stmt = $pdo->prepare(
            'UPDATE question SET orderIndex = :o WHERE questionID = :id AND questionnaireID = :qid'
        );
        foreach ($orderedIds as $idx => $questionId) {
            $stmt->execute([
                ':o' => (int) $idx,
                ':id' => $questionId,
                ':qid' => $questionnaireID,
            ]);
        }
    }

    public static function nextOrderIndex(PDO $pdo, string $questionnaireID): int
    {
        $max = $pdo->prepare(
            'SELECT COALESCE(MAX(orderIndex), 0) + 1 FROM question WHERE questionnaireID = :id'
        );
        $max->execute([':id' => $questionnaireID]);

        return (int) $max->fetchColumn();
    }
}