<?php

namespace App\Console\Commands;

use App\Services\ExamPdfExportService;
use App\Services\QuestionQualityCheckService;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;

class RunQuestionQualityCheckCommand extends Command
{
    protected $signature = 'question:qc
        {--table=questions_tem : 待质检题目表名}
        {--kp= : 指定知识点，不传则按下学期题少 KP 筛选}
        {--limit=100 : 质检题目数量上限}
        {--textbook= : 教材 ID}
        {--semester=2 : 学期 1=上 2=下}
        {--dry-run : 仅输出筛选结果，不执行质检}
        {--list-kps : 第一步：仅罗列前10个题少的 KP（按下学期章节），不质检}
        {--export-pdf : 按知识点分组生成 PDF（使用组卷规范，含试卷+判卷）}
        {--ai-check : 启用 AI 校验（答案正确性、答案与题目匹配，会请求 AI 接口）}';

    protected $description = '题目自动质检：从 questions_tem 按下学期题少 KP 筛选题目并执行校验';

    public function handle(QuestionQualityCheckService $qcService, ExamPdfExportService $pdfService): int
    {
        if ($this->option('list-kps')) {
            return $this->listKpsWithFewQuestions($qcService, 10);
        }

        if ($this->option('export-pdf')) {
            return $this->exportPdfByKp($qcService, $pdfService);
        }

        $table = $this->option('table');

        if (! Schema::hasTable($table)) {
            $this->error("表 {$table} 不存在，请先创建或指定正确表名");
            return 1;
        }

        $kp = $this->option('kp');
        $limit = (int) $this->option('limit');
        $dryRun = $this->option('dry-run');

        $excludeFromQuestions = $table === 'questions_tem' && Schema::hasTable('questions')
            && Schema::hasColumn($table, 'question_code')
            && Schema::hasColumn('questions', 'question_code');

        if ($kp) {
            $query = DB::table($table)->where('kp_code', $kp);
        } else {
            $kps = $qcService->getKpsWithFewQuestions(
                $this->option('textbook') ? (int) $this->option('textbook') : null,
                (int) $this->option('semester'),
                10
            );

            if (empty($kps)) {
                $this->warn('未找到题少的 KP，请检查 textbooks、textbook_chapter_knowledge_relation 数据');
                return 0;
            }

            $this->info('按下学期题少 KP 筛选（前 10 个）：');
            foreach ($kps as $i => $r) {
                $this->line("  " . ($i + 1) . ". {$r['kp_code']} — {$r['question_count']} 题");
            }

            $kpCodes = array_column($kps, 'kp_code');
            $query = DB::table($table)->whereIn('kp_code', $kpCodes);
        }

        if ($excludeFromQuestions) {
            $query->whereNotIn('question_code', DB::table('questions')->select('question_code'));
            $this->info('已排除 questions 中已有的题目（按 question_code 去重）');
        }

        $questions = $query->limit($limit)->get();
        $aiCheck = $this->option('ai-check');

        $total = $questions->count();
        $this->info("待质检题目数: {$total}");
        if ($aiCheck) {
            $this->info('已启用 AI 校验（答案正确性、与题目匹配）');
        }

        if ($dryRun) {
            $this->info('[dry-run] 不执行质检');
            return 0;
        }

        $passed = 0;
        $failed = 0;

        $bar = $this->output->createProgressBar($total);
        $bar->start();

        foreach ($questions as $q) {
            $row = (array) $q;
            $mapped = $this->mapQuestionRow($row);
            $result = $qcService->runAutoCheck(
                $mapped,
                $row['id'] ?? null,
                null,
                ['ai_check' => $aiCheck]
            );

            if ($result['passed']) {
                $passed++;
            } else {
                $failed++;
                $this->newLine();
                $labels = array_map(
                    fn ($code) => QuestionQualityCheckService::RULES[$code]['name'] ?? $code,
                    $result['errors']
                );
                $this->warn("  [{$row['id']}] " . implode('、', $labels));
            }
            $bar->advance();
        }

        $bar->finish();
        $this->newLine(2);
        $this->info("质检完成: 通过 {$passed}，未通过 {$failed}");

        return 0;
    }

    /**
     * 第一步：罗列按顺序题数最少的 10 个知识点（下学期章节、题少优先）
     */
    private function listKpsWithFewQuestions(QuestionQualityCheckService $qcService, int $top): int
    {
        $kps = $qcService->getKpsWithFewQuestions(
            $this->option('textbook') ? (int) $this->option('textbook') : null,
            (int) $this->option('semester'),
            $top
        );

        if (empty($kps)) {
            $this->warn('未找到题少的 KP，请检查 textbooks、textbook_chapter_knowledge_relation 数据');
            return 0;
        }

        $this->info("按下学期章节、题少优先，前 {$top} 个知识点：");
        $this->newLine();

        foreach ($kps as $i => $r) {
            $rank = $i + 1;
            $this->line("  {$rank}. {$r['kp_code']} — {$r['question_count']} 题");
        }

        return 0;
    }

    /**
     * 按知识点分组生成 PDF，使用组卷和 PDF 生成规范（ExamPdfExportService::generateByQuestions）
     */
    private function exportPdfByKp(QuestionQualityCheckService $qcService, ExamPdfExportService $pdfService): int
    {
        $table = $this->option('table');
        $kp = $this->option('kp');
        $grouped = $qcService->getQcQuestionsGroupedByKp(
            $table,
            $this->option('textbook') ? (int) $this->option('textbook') : null,
            (int) $this->option('semester'),
            10,
            (int) $this->option('limit') ?: null,
            $kp ?: null
        );

        if (empty($grouped)) {
            $this->warn('未找到待导出的题目，请检查数据');
            return 0;
        }

        $this->info('按知识点分组生成 PDF（试卷 + 判卷）：');
        $this->newLine();

        $student = ['name' => '________', 'grade' => '________'];
        $teacher = ['name' => '________'];
        $totalPdf = 0;
        $errors = [];

        foreach ($grouped as $kpCode => $questions) {
            $count = $questions->count();
            $this->line("  [{$kpCode}] {$count} 题");

            $groupedQuestions = $this->buildGroupedQuestionsForPdf($questions);
            $totalQ = count($groupedQuestions['choice'] ?? []) + count($groupedQuestions['fill'] ?? []) + count($groupedQuestions['answer'] ?? []);
            if ($totalQ === 0) {
                $this->warn("    跳过：无可导出题目");
                continue;
            }

            $paperName = "质检题目_{$kpCode}";
            $paperId = 'qc_kp_' . $kpCode . '_' . time() . '_' . uniqid();
            $paper = $this->buildVirtualPaperForPdf($paperId, $paperName, $groupedQuestions);

            try {
                $result = $pdfService->generateByQuestions($paper, $groupedQuestions, $student, $teacher, true);
                if (! empty($result['pdf_url'])) {
                    $this->line('');
                    $this->line($result['pdf_url']);
                    $this->line('');
                    $totalPdf++;
                }
            } catch (\Throwable $e) {
                $errors[] = "{$kpCode}: {$e->getMessage()}";
                $this->error("    失败: {$e->getMessage()}");
            }
        }

        $this->newLine();
        $this->info("完成: 共 {$totalPdf} 个知识点生成 PDF" . (empty($errors) ? '' : '，' . count($errors) . ' 个失败'));

        return empty($errors) ? 0 : 1;
    }

    /**
     * 将题目集合转为 PDF 规范格式：choice / fill / answer
     */
    private function buildGroupedQuestionsForPdf($questions): array
    {
        $grouped = ['choice' => [], 'fill' => [], 'answer' => []];
        $typeMap = [
            'choice' => 'choice', '选择题' => 'choice', 'single_choice' => 'choice', 'multiple_choice' => 'choice',
            'fill' => 'fill', '填空题' => 'fill', 'blank' => 'fill',
            'answer' => 'answer', '解答题' => 'answer', 'subjective' => 'answer', 'calculation' => 'answer', 'proof' => 'answer',
        ];
        $scoreMap = ['choice' => 5, 'fill' => 5, 'answer' => 10];

        $num = 1;
        foreach ($questions as $q) {
            $rawType = strtolower(trim((string) ($q->question_type ?? $q->tags ?? 'answer')));
            $type = $typeMap[$rawType] ?? 'answer';
            $score = $scoreMap[$type] ?? 5;

            $opts = $q->options ?? null;
            if (is_string($opts)) {
                $opts = json_decode($opts, true);
            }

            $grouped[$type][] = (object) [
                'id' => $q->id ?? 0,
                'question_number' => $num++,
                'content' => $q->stem ?? $q->content ?? '',
                'options' => is_array($opts) ? $opts : [],
                'answer' => $q->answer ?? $q->correct_answer ?? '',
                'solution' => $q->solution ?? '',
                'score' => $score,
                'difficulty' => $q->difficulty ?? 0.5,
                'kp_code' => $q->kp_code ?? '',
            ];
        }

        return $grouped;
    }

    /**
     * 构建虚拟试卷对象（符合 ExamPdfExportService 规范）
     */
    private function buildVirtualPaperForPdf(string $paperId, string $paperName, array $groupedQuestions): object
    {
        $totalScore = 0;
        $totalQuestions = 0;
        foreach ($groupedQuestions as $qs) {
            foreach ($qs as $q) {
                $totalScore += $q->score ?? 5;
                $totalQuestions++;
            }
        }

        return (object) [
            'paper_id' => $paperId,
            'paper_name' => $paperName,
            'total_score' => $totalScore,
            'total_questions' => $totalQuestions,
            'created_at' => now()->toDateTimeString(),
        ];
    }

    /**
     * 将 questions_tem 行映射为质检服务所需格式
     */
    private function mapQuestionRow(array $row): array
    {
        $optionsRaw = $row['options'] ?? null;
        $options = null;
        $optionsJsonInvalid = false;

        if (is_string($optionsRaw) && trim($optionsRaw) !== '') {
            $decoded = json_decode($optionsRaw, true);
            if (json_last_error() !== JSON_ERROR_NONE) {
                $optionsJsonInvalid = true;
            } else {
                $options = $decoded;
            }
        } elseif (is_array($optionsRaw)) {
            $options = $optionsRaw;
        }

        return [
            'stem' => $row['stem'] ?? $row['content'] ?? '',
            'answer' => $row['answer'] ?? $row['correct_answer'] ?? '',
            'solution' => $row['solution'] ?? '',
            'question_type' => $row['question_type'] ?? $row['tags'] ?? '',
            'options' => $options,
            'options_json_invalid' => $optionsJsonInvalid,
        ];
    }
}