<?php

namespace App\Jobs;

use App\Models\MarkdownImport;
use App\Models\PreQuestionCandidate;
use App\Services\MarkdownQuestionParser;
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\DB;
use Illuminate\Support\Facades\Log;

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

    public int $timeout = 300; // 5分钟超时
    public int $tries = 3;

    public function __construct(
        public int $markdownImportId,
        public int $sequenceStart,
        public int $sequenceEnd
    ) {
        //
    }

    public function handle(MarkdownQuestionParser $parser): void
    {
        $import = MarkdownImport::find($this->markdownImportId);
        if (!$import) {
            Log::error('MarkdownImport not found for batch', [
                'id' => $this->markdownImportId,
                'sequence_start' => $this->sequenceStart,
                'sequence_end' => $this->sequenceEnd,
            ]);
            return;
        }

        Log::info('Markdown batch started', [
            'import_id' => $this->markdownImportId,
            'sequence_start' => $this->sequenceStart,
            'sequence_end' => $this->sequenceEnd,
        ]);

        $records = PreQuestionCandidate::query()
            ->where('import_id', $this->markdownImportId)
            ->whereBetween('sequence', [$this->sequenceStart, $this->sequenceEnd])
            ->orderBy('sequence')
            ->get();

        $processed = 0;
        $failed = 0;

        foreach ($records as $record) {
            try {
                // 已经处理过的不重复处理
                if (in_array($record->status, ['pending', 'reviewed', 'accepted', 'rejected'], true) && $record->stem !== null) {
                    continue;
                }

                $parsed = $parser->parseRawMarkdown((string) $record->raw_markdown, (int) $record->index);

                $record->update([
                    'stem' => $parsed['stem'] ?? null,
                    'options' => $parsed['options'] ?? null,
                    'images' => $parsed['images'] ?? [],
                    'tables' => $parsed['tables'] ?? [],
                    'is_question_candidate' => (bool) ($parsed['is_question_candidate'] ?? false),
                    'ai_confidence' => $parsed['ai_confidence'] ?? null,
                    'status' => 'pending',
                ]);

                $processed++;
            } catch (\Throwable $e) {
                $failed++;

                Log::warning('Markdown batch item failed', [
                    'import_id' => $this->markdownImportId,
                    'candidate_id' => $record->id,
                    'sequence' => $record->sequence,
                    'index' => $record->index,
                    'error' => $e->getMessage(),
                ]);
            }
        }

        if ($processed > 0) {
            DB::table('markdown_imports')
                ->where('id', $this->markdownImportId)
                ->update([
                    'progress_current' => DB::raw('progress_current + ' . (int) $processed),
                    'progress_updated_at' => now(),
                    'progress_stage' => MarkdownImport::STAGE_AI_PARSING,
                    'progress_message' => 'AI 解析中…',
                ]);
        }

        Log::info('Markdown batch finished', [
            'import_id' => $this->markdownImportId,
            'sequence_start' => $this->sequenceStart,
            'sequence_end' => $this->sequenceEnd,
            'processed' => $processed,
            'failed' => $failed,
        ]);

        $this->finalizeIfDone();
    }

    private function finalizeIfDone(): void
    {
        $import = MarkdownImport::find($this->markdownImportId);
        if (!$import) {
            return;
        }

        $total = (int) ($import->progress_total ?? 0);
        $current = (int) ($import->progress_current ?? 0);

        if ($total <= 0 || $current < $total) {
            return;
        }

        // 只要有一个 batch 到达“完成条件”，就尝试做一次幂等的最终状态更新
        $updated = DB::table('markdown_imports')
            ->where('id', $this->markdownImportId)
            ->where('status', 'processing')
            ->update([
                'status' => 'parsed',
                'progress_stage' => MarkdownImport::STAGE_PARSED,
                'progress_message' => '解析完成，等待人工校对',
                'progress_updated_at' => now(),
                'processing_finished_at' => now(),
            ]);

        if ($updated) {
            Log::info('Markdown import finalized', [
                'import_id' => $this->markdownImportId,
                'progress_total' => $total,
                'progress_current' => $current,
            ]);
        }
    }
}