<?php

/**
 * 将审计 priority 明细里的题目分批导出为本地 PDF（题目质检模板），不上传 CDN。
 *
 * 用法：
 *   php scripts/dump_priority_issue_pdfs_local.php [--per-pdf 150]
 *       [--file storage/app/audit_placeholder/rendered_placeholder_audit_priority_issues_*.ndjson]
 *       [--out-dir storage/app/audit_placeholder/local_priority_pdfs]
 *       [--connection mysql] [--table questions]
 *
 * 不指定 --file 时，取 storage/app/audit_placeholder 下最新的 priority_issues ndjson。
 * 每份 PDF 内题量由 --per-pdf 控制（默认 150，可改 50/200 等）。
 */

declare(strict_types=1);

require __DIR__.'/../vendor/autoload.php';
$app = require __DIR__.'/../bootstrap/app.php';
$kernel = $app->make(Illuminate\Contracts\Console\Kernel::class);
$kernel->bootstrap();

use App\Services\ExamPdfExportService;
use App\Support\PaperNaming;
use Illuminate\Support\Facades\DB;

$options = getopt('', [
    'per-pdf::',
    'file::',
    'out-dir::',
    'connection::',
    'table::',
]);

$perPdf = isset($options['per-pdf']) ? max(1, (int) $options['per-pdf']) : 150;
$connection = isset($options['connection']) ? trim((string) $options['connection']) : config('database.default');
$table = isset($options['table']) ? trim((string) $options['table']) : 'questions';

$defaultOut = dirname(__DIR__).'/storage/app/audit_placeholder/local_priority_pdfs';
$outDir = isset($options['out-dir']) ? rtrim((string) $options['out-dir'], '/') : $defaultOut;
if ($outDir[0] !== '/') {
    $outDir = dirname(__DIR__).'/'.$outDir;
}

$ndjsonPath = isset($options['file']) ? trim((string) $options['file']) : '';
if ($ndjsonPath === '') {
    $auditDir = dirname(__DIR__).'/storage/app/audit_placeholder';
    $glob = glob($auditDir.'/rendered_placeholder_audit_priority_issues_*.ndjson') ?: [];
    if ($glob === []) {
        fwrite(STDERR, "No priority ndjson under {$auditDir}. Run audit script first.\n");
        exit(1);
    }
    usort($glob, static fn(string $a, string $b): int => strcmp($b, $a));
    $ndjsonPath = $glob[0];
}

if (! is_readable($ndjsonPath)) {
    fwrite(STDERR, "Cannot read: {$ndjsonPath}\n");
    exit(1);
}

$orderedUniqueIds = [];
$seen = [];
$fh = fopen($ndjsonPath, 'rb');
if ($fh === false) {
    fwrite(STDERR, "Failed to open {$ndjsonPath}\n");
    exit(1);
}
while (($line = fgets($fh)) !== false) {
    $line = trim($line);
    if ($line === '') {
        continue;
    }
    $row = json_decode($line, true);
    if (! is_array($row) || ! isset($row['id'])) {
        continue;
    }
    $id = (int) $row['id'];
    if ($id <= 0 || isset($seen[$id])) {
        continue;
    }
    $seen[$id] = true;
    $orderedUniqueIds[] = $id;
}
fclose($fh);

if ($orderedUniqueIds === []) {
    fwrite(STDERR, "No question ids in {$ndjsonPath}\n");
    exit(1);
}

$batches = array_chunk($orderedUniqueIds, $perPdf);
$stamp = date('Ymd_His');
$runDir = $outDir.'/'.$stamp;
if (! @mkdir($runDir, 0775, true) && ! is_dir($runDir)) {
    fwrite(STDERR, "Cannot mkdir {$runDir}\n");
    exit(1);
}

/** @var ExamPdfExportService $pdfService */
$pdfService = $app->make(ExamPdfExportService::class);

$written = [];
$batchIndex = 0;
foreach ($batches as $chunk) {
    $batchIndex++;
    $questions = DB::connection($connection)
        ->table($table)
        ->whereIn('id', $chunk)
        ->get();

    $questionMap = [];
    foreach ($questions as $q) {
        $questionMap[(int) $q->id] = $q;
    }

    $groupedQuestions = groupQuestionsByType($questionMap, $chunk);
    $firstId = $chunk[0];
    $lastId = $chunk[count($chunk) - 1];
    $safeTitle = PaperNaming::toSafeFilename(
        'priority_issues_batch_'.$batchIndex.'_'.count($chunk).'qs_'.$firstId.'-'.$lastId
    );
    $filename = $safeTitle.'.pdf';
    $localPath = $runDir.'/'.$filename;

    $paper = buildVirtualPaper(
        '重点排查 PDF 第 '.$batchIndex.'/'.count($batches).' 批（'.count($chunk).' 题）',
        'priority_local_'.$stamp.'_b'.$batchIndex,
        $groupedQuestions
    );

    $result = $pdfService->generateQuestionCheckPdf(
        $paper,
        $groupedQuestions,
        ['name' => '本地导出', 'grade' => '________'],
        ['name' => '________'],
        $localPath
    );

    if (($result['local_path'] ?? '') === '') {
        fwrite(STDERR, "FAILED batch {$batchIndex}: ".json_encode($result, JSON_UNESCAPED_UNICODE)."\n");
        exit(1);
    }

    $written[] = [
        'batch' => $batchIndex,
        'count' => count($chunk),
        'ids_range' => [$firstId, $lastId],
        'local_path' => $localPath,
        'bytes' => @filesize($localPath) ?: 0,
    ];

    fwrite(STDERR, "wrote batch {$batchIndex}/".count($batches)." → {$filename}\n");
}

$manifestPath = $runDir.'/manifest.json';
file_put_contents($manifestPath, json_encode([
    'generated_at' => date('c'),
    'source_ndjson' => realpath($ndjsonPath) ?: $ndjsonPath,
    'connection' => $connection,
    'table' => $table,
    'per_pdf' => $perPdf,
    'total_questions' => count($orderedUniqueIds),
    'batch_count' => count($batches),
    'output_directory' => $runDir,
    'batches' => $written,
], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));

echo json_encode([
    'output_directory' => $runDir,
    'manifest_path' => $manifestPath,
    'batch_count' => count($written),
    'total_questions' => count($orderedUniqueIds),
    'batches' => $written,
], JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT)."\n";

/**
 * @param  array<int, object>  $questionMap
 */
function groupQuestionsByType(array $questionMap, array $originalOrder): array
{
    $grouped = [
        'choice' => [],
        'fill' => [],
        'answer' => [],
    ];

    $questionNumber = 1;

    foreach ($originalOrder as $id) {
        if (! isset($questionMap[$id])) {
            continue;
        }

        $q = $questionMap[$id];
        $type = normalizeQuestionType($q->question_type ?? null);

        $questionObj = (object) [
            'id' => $q->id,
            'question_number' => $questionNumber++,
            'content' => $q->stem,
            'options' => is_string($q->options) ? json_decode($q->options, true) : ($q->options ?? []),
            'answer' => $q->answer,
            'solution' => $q->solution,
            'score' => getDefaultScore($type),
            'difficulty' => $q->difficulty,
            'kp_code' => $q->kp_code,
        ];

        $grouped[$type][] = $questionObj;
    }

    return $grouped;
}

function normalizeQuestionType(?string $type): string
{
    if (! $type) {
        return 'answer';
    }

    $type = strtolower(trim($type));

    $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',
    ];

    return $typeMap[$type] ?? 'answer';
}

function getDefaultScore(string $type): int
{
    return match ($type) {
        'choice' => 5,
        'fill' => 5,
        'answer' => 10,
        default => 5,
    };
}

/**
 * @param  array<string, array<int, object>>  $groupedQuestions
 */
function buildVirtualPaper(string $paperName, string $studentId, array $groupedQuestions): object
{
    $totalScore = 0;
    $totalQuestions = 0;

    foreach ($groupedQuestions as $questions) {
        foreach ($questions as $q) {
            $totalScore += $q->score;
            $totalQuestions++;
        }
    }

    $paperId = $studentId.'_'.uniqid();

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