<?php

namespace App\Jobs;

use App\Models\MistakeRecord;
use App\Services\LearningAnalyticsService;
use App\Services\QuestionBankService;
use App\Services\TaskManager;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Log;
use Throwable;

class AssembleExamTaskJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public string $taskId;

    public int $tries = 2;

    public int $timeout = 180;

    public function __construct(string $taskId)
    {
        $this->taskId = $taskId;
        // 组卷任务放到默认队列，与 PDF 队列解耦，降低排队等待
        $this->onQueue('default');
        $this->afterCommit();
    }

    public function handle(
        LearningAnalyticsService $learningAnalyticsService,
        QuestionBankService $questionBankService,
        TaskManager $taskManager
    ): void {
        $task = $taskManager->getTaskStatus($this->taskId);
        if (!is_array($task) || empty($task['data']) || !is_array($task['data'])) {
            $taskManager->markTaskFailed($this->taskId, '任务数据不存在');
            return;
        }

        $data = $task['data'];
        $assembleStartedAt = microtime(true);

        try {
            $taskManager->updateTaskProgress($this->taskId, 5, '开始异步组卷...');

            $assembleType = (int) ($data['assemble_type'] ?? 4);
            $difficultyCategory = $data['difficulty_category'] ?? 1;
            $paperName = $data['paper_name'] ?? ('智能试卷_'.now()->format('Ymd_His'));
            $mistakeIds = $data['mistake_ids'] ?? [];
            $mistakeQuestionIds = $data['mistake_question_ids'] ?? [];
            $paperIds = $data['paper_ids'] ?? [];
            $questionTypeRatio = $this->normalizeQuestionTypeRatio($data['question_type_ratio'] ?? []);

            $questions = [];
            $result = null;
            $diagnosticChapterId = null;
            $explanationKpCodes = null;

            if ($assembleType === 15) {
                // assemble_type=15（展示类型「错题再练」）：paper_ids 为题库 question_id，须在该学生 mistake_records 中存在；与 assemble_type=5（卷 id 追练）分离
                $questionIdList = $this->normalizeBankQuestionIdsList($paperIds);
                if ($questionIdList === []) {
                    $taskManager->markTaskFailed($this->taskId, '错题再练组卷需提供 paper_ids（题库题目 id）');
                    return;
                }

                $strict = $this->resolveMistakeQuestionIdsStrictForStudent(
                    (string) $data['student_id'],
                    [],
                    array_map(static fn ($id) => (string) $id, $questionIdList)
                );
                if (! ($strict['ok'] ?? false)) {
                    $taskManager->markTaskFailed($this->taskId, $strict['message'] ?? '错题校验失败');
                    return;
                }
                $questionIds = $strict['question_ids'];

                $bankQuestions = $questionBankService->getQuestionsByIds($questionIds)['data'] ?? [];
                if (empty($bankQuestions)) {
                    $taskManager->markTaskFailed($this->taskId, '错题对应题库题目不可用');
                    return;
                }

                $questions = $this->hydrateQuestions($bankQuestions, $data['kp_codes'] ?? []);
                $questions = $this->sortQuestionsByRequestedIds($questions, $questionIds);
                $paperName = $data['paper_name'] ?? ('错题再练_'.$data['student_id'].'_'.now()->format('Ymd_His'));
            } elseif (! empty($mistakeIds) || ! empty($mistakeQuestionIds)) {
                // assemble_type=5 时 mistake_ids / mistake_question_ids 须严格归属该学生；其它类型走宽松解析。
                if ($assembleType === 5) {
                    $strict = $this->resolveMistakeQuestionIdsStrictForStudent(
                        (string) $data['student_id'],
                        $mistakeIds,
                        $mistakeQuestionIds
                    );
                    if (! ($strict['ok'] ?? false)) {
                        $taskManager->markTaskFailed($this->taskId, $strict['message'] ?? '错题校验失败');
                        return;
                    }
                    $questionIds = $strict['question_ids'];
                } else {
                    $questionIds = $this->resolveMistakeQuestionIds((string) $data['student_id'], $mistakeIds, $mistakeQuestionIds);
                }

                if (empty($questionIds)) {
                    $taskManager->markTaskFailed($this->taskId, '未找到可用的错题题目');
                    return;
                }

                $bankQuestions = $questionBankService->getQuestionsByIds($questionIds)['data'] ?? [];
                if (empty($bankQuestions)) {
                    $taskManager->markTaskFailed($this->taskId, '错题对应题库题目不可用');
                    return;
                }

                $questions = $this->hydrateQuestions($bankQuestions, $data['kp_codes'] ?? []);
                $questions = $this->sortQuestionsByRequestedIds($questions, $questionIds);
                $paperName = $data['paper_name'] ?? ('错题复习_'.$data['student_id'].'_'.now()->format('Ymd_His'));
            } else {
                $params = [
                    'student_id' => $data['student_id'],
                    'grade' => $data['grade'] ?? null,
                    'total_questions' => $data['total_questions'],
                    'kp_codes' => $assembleType === 3 ? null : ($data['kp_codes'] ?? null),
                    'skills' => $data['skills'] ?? [],
                    'question_type_ratio' => $questionTypeRatio,
                    'difficulty_category' => $difficultyCategory,
                    'assemble_type' => $assembleType,
                    'exam_type' => $data['exam_type'] ?? 'general',
                    'paper_ids' => $paperIds,
                    'textbook_id' => $data['textbook_id'] ?? null,
                    'end_catalog_id' => $data['end_catalog_id'] ?? null,
                    'chapter_id_list' => $data['chapter_id_list'] ?? null,
                    'kp_code_list' => $assembleType === 3 ? null : ($data['kp_code_list'] ?? $data['kp_codes'] ?? []),
                    'practice_options' => $data['practice_options'] ?? null,
                    'mistake_options' => $data['mistake_options'] ?? null,
                ];

                $result = $learningAnalyticsService->generateIntelligentExam($params);
                if (empty($result['success'])) {
                    $taskManager->markTaskFailed($this->taskId, $result['message'] ?? '智能出卷失败');
                    return;
                }

                if (isset($result['stats']['difficulty_category'])) {
                    $difficultyCategory = $result['stats']['difficulty_category'];
                }
                $diagnosticChapterId = $result['diagnostic_chapter_id'] ?? null;
                $explanationKpCodes = $result['explanation_kp_codes'] ?? null;
                $questions = $this->hydrateQuestions($result['questions'] ?? [], $data['kp_codes'] ?? []);
            }

            if (empty($questions)) {
                $taskManager->markTaskFailed($this->taskId, '未能生成有效题目');
                return;
            }

            $totalQuestions = min((int) ($data['total_questions'] ?? 10), count($questions));
            $questions = array_slice($questions, 0, $totalQuestions);
            $questions = $this->sortQuestionsWithinTypeByDifficulty($questions);
            $targetTotalScore = (float) ($data['total_score'] ?? 100.0);
            $questions = $this->adjustQuestionScores($questions, $targetTotalScore);
            $totalScore = array_sum(array_column($questions, 'score'));

            $finalAssembleType = ($result !== null && isset($result['assemble_type'])) ? $result['assemble_type'] : $assembleType;
            $paperId = $questionBankService->saveExamToDatabase([
                'paper_id' => $data['paper_id'] ?? null,
                'paper_name' => $paperName,
                'student_id' => $data['student_id'],
                'teacher_id' => $data['teacher_id'] ?? null,
                'assembleType' => $finalAssembleType,
                'difficulty_category' => $difficultyCategory,
                'total_score' => $totalScore,
                'questions' => $questions,
                'diagnostic_chapter_id' => $diagnosticChapterId,
                'explanation_kp_codes' => $explanationKpCodes,
            ]);

            if (! $paperId) {
                $taskManager->markTaskFailed($this->taskId, '试卷保存失败');
                return;
            }

            $finalStats = $result['stats'] ?? [
                'total_selected' => count($questions),
                'mistake_based' => ! empty($mistakeIds) || ! empty($mistakeQuestionIds) || $assembleType === 15,
            ];
            if (! isset($finalStats['difficulty_category'])) {
                $finalStats['difficulty_category'] = $difficultyCategory;
            }

            $taskManager->updateTaskStatus($this->taskId, [
                'paper_id' => $paperId,
                'stats' => $finalStats,
                'assemble_elapsed_ms' => (int) round((microtime(true) - $assembleStartedAt) * 1000),
            ]);
            $taskManager->updateTaskProgress($this->taskId, 40, '组卷完成，开始生成PDF...');

            dispatch(new GenerateExamPdfJob($this->taskId, $paperId));
            Log::info('AssembleExamTaskJob: 组卷任务完成并已触发PDF任务', [
                'task_id' => $this->taskId,
                'paper_id' => $paperId,
            ]);
        } catch (\Exception $e) {
            Log::error('AssembleExamTaskJob: 异常', [
                'task_id' => $this->taskId,
                'error' => $e->getMessage(),
            ]);
            $taskManager->markTaskFailed($this->taskId, $e->getMessage());
        }
    }

    public function failed(Throwable $exception): void
    {
        app(TaskManager::class)->markTaskFailed($this->taskId, $exception->getMessage());
    }

    private function normalizeQuestionTypeRatio(array $input): array
    {
        $defaults = ['选择题' => 40, '填空题' => 20, '解答题' => 40];
        $normalized = [];
        foreach ($input as $key => $value) {
            if (! is_numeric($value)) {
                continue;
            }
            $type = $this->normalizeQuestionTypeKey((string) $key);
            if ($type) {
                $normalized[$type] = (float) $value;
            }
        }
        $merged = array_merge($defaults, $normalized);
        $sum = array_sum($merged);
        if ($sum > 0) {
            foreach ($merged as $k => $v) {
                $merged[$k] = round(($v / $sum) * 100, 2);
            }
        }
        return $merged;
    }

    private function normalizeQuestionTypeKey(string $key): ?string
    {
        $key = trim($key);
        if (in_array($key, ['choice', '选择题', 'single_choice', 'multiple_choice', 'CHOICE', 'SINGLE_CHOICE', 'MULTIPLE_CHOICE'], true)) {
            return '选择题';
        }
        if (in_array($key, ['fill', '填空题', 'blank', 'FILL_IN_THE_BLANK', 'FILL'], true)) {
            return '填空题';
        }
        if (in_array($key, ['answer', '解答题', '计算题', 'CALCULATION', 'WORD_PROBLEM', 'PROOF'], true)) {
            return '解答题';
        }
        return null;
    }

    private function resolveMistakeQuestionIds(string $studentId, array $mistakeIds, array $mistakeQuestionIds): array
    {
        $questionIds = [];
        if (! empty($mistakeQuestionIds)) {
            $questionIds = array_merge($questionIds, $mistakeQuestionIds);
        }
        if (! empty($mistakeIds)) {
            $fromDb = MistakeRecord::query()->where('student_id', $studentId)->whereIn('id', $mistakeIds)->pluck('question_id')->filter()->values()->all();
            $questionIds = array_merge($questionIds, $fromDb);
        }
        return array_values(array_unique(array_filter($questionIds)));
    }

    /**
     * 追练（assemble_type=5）+ 指定错题：mistake_ids 须逐条命中该学生的 mistake_records；
     * mistake_question_ids 须在该学生错题本中至少有一条记录。顺序：先按 mistake_ids 请求顺序，再追加题号列表（去重）。
     * assemble_type=15（错题再练）将 paper_ids 解析为题库题目 id 后，仅使用本方法的 mistake_question_ids 分支做校验。
     *
     * @return array{ok: bool, message?: string, question_ids?: array<int, string>}
     */
    private function resolveMistakeQuestionIdsStrictForStudent(string $studentId, array $mistakeIds, array $mistakeQuestionIds): array
    {
        $mistakeIds = array_values(array_filter(array_map('strval', $mistakeIds), fn ($v) => $v !== ''));
        $mistakeQuestionIds = array_values(array_filter(array_map('strval', $mistakeQuestionIds), fn ($v) => $v !== ''));

        $orderedQuestionIds = [];
        $seen = [];

        if ($mistakeIds !== []) {
            $rowIdSet = array_values(array_unique($mistakeIds));
            $records = MistakeRecord::query()
                ->where('student_id', $studentId)
                ->whereIn('id', $rowIdSet)
                ->get()
                ->keyBy(fn ($r) => (string) $r->id);

            foreach ($mistakeIds as $mid) {
                $rec = $records[$mid] ?? null;
                $qid = $rec && $rec->question_id !== null && $rec->question_id !== ''
                    ? (string) $rec->question_id
                    : '';
                if ($qid === '') {
                    return [
                        'ok' => false,
                        'message' => '部分错题记录不存在或不属于该学生: '.$mid,
                    ];
                }
                if (! isset($seen[$qid])) {
                    $seen[$qid] = true;
                    $orderedQuestionIds[] = $qid;
                }
            }
        }

        foreach ($mistakeQuestionIds as $qid) {
            $exists = MistakeRecord::query()
                ->where('student_id', $studentId)
                ->where('question_id', $qid)
                ->exists();
            if (! $exists) {
                return [
                    'ok' => false,
                    'message' => '学生错题本中不存在题目: '.$qid,
                ];
            }
            if (! isset($seen[$qid])) {
                $seen[$qid] = true;
                $orderedQuestionIds[] = $qid;
            }
        }

        return ['ok' => true, 'question_ids' => $orderedQuestionIds];
    }

    /**
     * assemble_type=15 时 paper_ids 承载题库题目 id：纯数字字符串转为 int，去重并保持首次出现顺序。
     *
     * @return array<int, int|string>
     */
    private function normalizeBankQuestionIdsList(array $raw): array
    {
        $out = [];
        $seen = [];
        foreach ($raw as $v) {
            if ($v === null) {
                continue;
            }
            if (is_string($v)) {
                $v = trim($v);
                if ($v === '') {
                    continue;
                }
            }
            if (is_int($v)) {
                $normalized = $v;
            } elseif (is_float($v) && floor($v) == $v) {
                $normalized = (int) $v;
            } else {
                $s = trim((string) $v);
                if ($s === '') {
                    continue;
                }
                $normalized = preg_match('/^-?\d+$/', $s) ? (int) $s : $s;
            }
            $dedupeKey = is_int($normalized) ? 'i:'.$normalized : 's:'.(string) $normalized;
            if (isset($seen[$dedupeKey])) {
                continue;
            }
            $seen[$dedupeKey] = true;
            $out[] = $normalized;
        }

        return $out;
    }

    private function hydrateQuestions(array $questions, array $kpCodes): array
    {
        $normalized = [];
        foreach ($questions as $question) {
            $type = $this->normalizeQuestionTypeKey($question['question_type'] ?? $question['type'] ?? '') ?? $this->guessType($question);
            $score = $question['score'] ?? $this->defaultScore($type);
            $normalized[] = [
                'id' => $question['id'] ?? $question['question_id'] ?? null,
                'question_id' => $question['question_id'] ?? null,
                'question_type' => $type === '选择题' ? 'choice' : ($type === '填空题' ? 'fill' : 'answer'),
                'stem' => $question['stem'] ?? $question['content'] ?? ($question['question_text'] ?? ''),
                'content' => $question['content'] ?? $question['stem'] ?? '',
                'options' => $question['options'] ?? ($question['choices'] ?? []),
                'answer' => $question['answer'] ?? $question['correct_answer'] ?? '',
                'solution' => $question['solution'] ?? '',
                'difficulty' => isset($question['difficulty']) ? (float) $question['difficulty'] : 0.5,
                'score' => $score,
                'estimated_time' => $question['estimated_time'] ?? 300,
                'kp' => $question['kp_code'] ?? $question['kp'] ?? $question['knowledge_point'] ?? ($kpCodes[0] ?? ''),
                'kp_code' => $question['kp_code'] ?? $question['kp'] ?? $question['knowledge_point'] ?? ($kpCodes[0] ?? ''),
            ];
        }
        return array_values(array_filter($normalized, fn ($q) => ! empty($q['id'])));
    }

    private function sortQuestionsByRequestedIds(array $questions, array $requestedIds): array
    {
        if (empty($requestedIds)) {
            return $questions;
        }
        $order = array_flip($requestedIds);
        usort($questions, function ($a, $b) use ($order) {
            $aPos = $order[(string) ($a['id'] ?? '')] ?? PHP_INT_MAX;
            $bPos = $order[(string) ($b['id'] ?? '')] ?? PHP_INT_MAX;
            return $aPos <=> $bPos;
        });
        return $questions;
    }

    private function guessType(array $question): string
    {
        if (! empty($question['options']) && is_array($question['options'])) {
            return '选择题';
        }
        $content = $question['stem'] ?? $question['content'] ?? '';
        if (is_string($content) && (strpos($content, '____') !== false || strpos($content, '（）') !== false)) {
            return '填空题';
        }
        return '解答题';
    }

    private function defaultScore(string $type): int
    {
        return match ($type) {
            '选择题' => 5,
            '填空题' => 5,
            '解答题' => 10,
            default => 5,
        };
    }

    private function sortQuestionsWithinTypeByDifficulty(array $questions): array
    {
        $grouped = ['choice' => [], 'fill' => [], 'answer' => []];
        foreach ($questions as $question) {
            $type = $this->normalizeQuestionType((string) ($question['question_type'] ?? 'answer'));
            $grouped[$type][] = $question;
        }
        $sortFn = function (array $a, array $b): int {
            $ad = (float) ($a['difficulty'] ?? 0.5);
            $bd = (float) ($b['difficulty'] ?? 0.5);
            if ($ad !== $bd) {
                return $ad <=> $bd;
            }
            return ((int) ($a['id'] ?? $a['question_id'] ?? 0)) <=> ((int) ($b['id'] ?? $b['question_id'] ?? 0));
        };
        usort($grouped['choice'], $sortFn);
        usort($grouped['fill'], $sortFn);
        usort($grouped['answer'], $sortFn);
        $sorted = array_merge($grouped['choice'], $grouped['fill'], $grouped['answer']);
        foreach ($sorted as $idx => &$question) {
            $question['question_number'] = $idx + 1;
        }
        unset($question);
        return $sorted;
    }

    private function normalizeQuestionType(string $type): string
    {
        $type = strtolower(trim($type));
        if (in_array($type, ['choice', 'single_choice', 'multiple_choice', '选择题', '单选', '多选'], true)) {
            return 'choice';
        }
        if (in_array($type, ['fill', 'fill_in_the_blank', 'blank', '填空题', '填空'], true)) {
            return 'fill';
        }
        return 'answer';
    }

    private function adjustQuestionScores(array $questions, float $targetTotalScore = 100.0): array
    {
        if (empty($questions)) {
            return $questions;
        }

        // 第一步：按题型排序
        $sortedQuestions = [];
        $choiceQuestions = [];
        $fillQuestions = [];
        $answerQuestions = [];

        foreach ($questions as $question) {
            $type = $this->normalizeQuestionType($question['question_type'] ?? 'answer');
            if ($type === 'choice') {
                $choiceQuestions[] = $question;
            } elseif ($type === 'fill') {
                $fillQuestions[] = $question;
            } else {
                $answerQuestions[] = $question;
            }
        }

        $sortedQuestions = array_merge($choiceQuestions, $fillQuestions, $answerQuestions);

        Log::debug('adjustQuestionScores 开始', [
            'choice_count' => count($choiceQuestions),
            'fill_count' => count($fillQuestions),
            'answer_count' => count($answerQuestions),
        ]);

        foreach ($sortedQuestions as $idx => &$question) {
            $question['question_number'] = $idx + 1;
        }
        unset($question);

        $typeCounts = [
            'choice' => count($choiceQuestions),
            'fill' => count($fillQuestions),
            'answer' => count($answerQuestions),
        ];

        $typeIndexes = ['choice' => [], 'fill' => [], 'answer' => []];
        foreach ($sortedQuestions as $index => $question) {
            $type = $this->normalizeQuestionType($question['question_type'] ?? 'answer');
            $typeIndexes[$type][] = $index;
        }

        $questionScores = [];
        $totalQuestions = $typeCounts['choice'] + $typeCounts['fill'] + $typeCounts['answer'];
        $globalBaseScore = floor($targetTotalScore / $totalQuestions);
        $globalBaseScore = max(1, $globalBaseScore);

        $typeOrder = [];
        foreach ($sortedQuestions as $question) {
            $type = $this->normalizeQuestionType($question['question_type'] ?? 'answer');
            if (! in_array($type, $typeOrder)) {
                $typeOrder[] = $type;
            }
        }

        $remainingBudget = $targetTotalScore;
        foreach ($typeOrder as $typeIndex => $type) {
            $count = $typeCounts[$type];
            if ($count === 0) {
                continue;
            }

            if ($typeIndex === 0) {
                $thisBase = $globalBaseScore;
                foreach ($typeIndexes[$type] as $idx) {
                    $questionScores[$idx] = $thisBase;
                }
                foreach ($typeIndexes[$type] as $idx) {
                    $questionScores[$idx] = max(1, $questionScores[$idx] - 1);
                }
                $allocated = 0;
                foreach ($typeIndexes[$type] as $idx) {
                    $allocated += $questionScores[$idx];
                }
                $remainingBudget -= $allocated;
            } elseif ($typeIndex === count($typeOrder) - 1) {
                $thisBase = floor($remainingBudget / $count);
                $thisBase = max(1, $thisBase);

                foreach ($typeIndexes[$type] as $idx) {
                    $questionScores[$idx] = $thisBase;
                }

                $total = $thisBase * $count;
                $remainder = $remainingBudget - $total;
                if ($remainder > 0) {
                    $answerIndexes = array_values($typeIndexes[$type]);
                    $startIdx = max(0, count($answerIndexes) - $remainder);
                    for ($i = $startIdx; $i < count($answerIndexes); $i++) {
                        $questionScores[$answerIndexes[$i]] += 1;
                    }
                }
            } else {
                $thisBase = $globalBaseScore;
                foreach ($typeIndexes[$type] as $idx) {
                    $questionScores[$idx] = $thisBase;
                }
                $allocated = 0;
                foreach ($typeIndexes[$type] as $idx) {
                    $allocated += $questionScores[$idx];
                }
                $remainingBudget -= $allocated;
            }
        }

        if (count($typeOrder) > 1) {
            $lastType = end($typeOrder);
            $otherTypes = array_slice($typeOrder, 0, -1);
            $maxOtherScore = 0;
            foreach ($otherTypes as $type) {
                foreach ($typeIndexes[$type] as $idx) {
                    $maxOtherScore = max($maxOtherScore, $questionScores[$idx]);
                }
            }

            $minLastScore = PHP_INT_MAX;
            foreach ($typeIndexes[$lastType] as $idx) {
                $minLastScore = min($minLastScore, $questionScores[$idx]);
            }

            if ($minLastScore <= $maxOtherScore) {
                $diff = $maxOtherScore - $minLastScore + 1;
                $reductionPerQuestion = min($diff, 2);
                foreach ($otherTypes as $type) {
                    foreach ($typeIndexes[$type] as $idx) {
                        $questionScores[$idx] = max(1, $questionScores[$idx] - $reductionPerQuestion);
                    }
                }

                $reallocated = $targetTotalScore;
                foreach ($typeIndexes[$lastType] as $idx) {
                    $reallocated -= $questionScores[$idx];
                }
                foreach ($otherTypes as $type) {
                    foreach ($typeIndexes[$type] as $idx) {
                        $reallocated -= $questionScores[$idx];
                    }
                }

                if ($reallocated > 0) {
                    $newBase = floor($reallocated / $typeCounts[$lastType]);
                    foreach ($typeIndexes[$lastType] as $idx) {
                        $questionScores[$idx] = $newBase;
                    }

                    $total = $newBase * $typeCounts[$lastType];
                    $remainder = $reallocated - $total;
                    if ($remainder > 0) {
                        $lastIndexes = array_values($typeIndexes[$lastType]);
                        $startIdx = max(0, count($lastIndexes) - $remainder);
                        for ($i = $startIdx; $i < count($lastIndexes); $i++) {
                            $questionScores[$lastIndexes[$i]] += 1;
                        }
                    }
                }
            }
        }

        $adjustedQuestions = [];
        foreach ($sortedQuestions as $index => $question) {
            $adjustedQuestions[$index] = $question;
            $adjustedQuestions[$index]['score'] = $questionScores[$index] ?? 5;
        }

        $total = array_sum(array_column($adjustedQuestions, 'score'));
        $diff = (int) $targetTotalScore - (int) $total;
        if ($diff !== 0 && ! empty($adjustedQuestions)) {
            $count = count($adjustedQuestions);
            $i = $count - 1;
            while ($diff !== 0) {
                $score = $adjustedQuestions[$i]['score'];
                if ($diff > 0) {
                    $adjustedQuestions[$i]['score'] = $score + 1;
                    $diff--;
                } else {
                    if ($score > 1) {
                        $adjustedQuestions[$i]['score'] = $score - 1;
                        $diff++;
                    }
                }

                $i--;
                if ($i < 0) {
                    $i = $count - 1;
                    if ($diff < 0) {
                        $minScore = min(array_column($adjustedQuestions, 'score'));
                        if ($minScore <= 1) {
                            break;
                        }
                    }
                }
            }
        }

        return $adjustedQuestions;
    }
}