<?php

namespace App\Jobs;

use App\Models\KnowledgeExplanation;
use App\Models\Paper;
use App\Services\ExamPdfExportService;
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 GenerateKnowledgeExplanationPdfJob implements ShouldQueue
{
    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;

    public function __construct(
        public string $taskId,
        public string $knowledgeId,
        public array $knowledgePoints
    ) {
        $this->onQueue('pdf');
        $this->afterCommit();
    }

    public int $tries = 3;

    public int $timeout = 300;

    public function handle(
        ExamPdfExportService $examPdfExportService,
        TaskManager $taskManager
    ): void {
        try {
            $record = KnowledgeExplanation::query()
                ->where('knowledge_id', $this->knowledgeId)
                ->first();
            if (! $record) {
                $taskManager->markTaskFailed($this->taskId, '知识点讲解记录不存在');
                return;
            }

            $taskManager->updateTaskProgress($this->taskId, 70, '开始渲染知识点讲解PDF...');
            $pdfUrl = $examPdfExportService->generateKnowledgeExplanationStandalonePdf($record, $this->knowledgePoints);
            if (! $pdfUrl) {
                $record->update(['status' => 'failed']);
                $taskManager->markTaskFailed($this->taskId, '知识点讲解PDF生成失败');
                return;
            }

            $record->update([
                'status' => 'completed',
                'pdf_url' => $pdfUrl,
                'generated_at' => now(),
            ]);
            $this->syncPaperRecord($record, $pdfUrl);

            $taskManager->markTaskCompleted($this->taskId, [
                'paper_id' => $this->knowledgeId,
                'knowledge_id' => $this->knowledgeId,
                'pdfs' => [
                    'all_pdf' => $pdfUrl,
                ],
                'exam_content' => $this->buildKnowledgeExamContent($record, $pdfUrl),
            ]);
            $taskManager->sendCallback($this->taskId);
        } catch (\Throwable $e) {
            Log::error('GenerateKnowledgeExplanationPdfJob 失败', [
                'task_id' => $this->taskId,
                'knowledge_id' => $this->knowledgeId,
                'error' => $e->getMessage(),
            ]);
            KnowledgeExplanation::query()
                ->where('knowledge_id', $this->knowledgeId)
                ->update(['status' => 'failed']);
            $taskManager->markTaskFailed($this->taskId, $e->getMessage());
        }
    }

    public function failed(Throwable $exception): void
    {
        KnowledgeExplanation::query()
            ->where('knowledge_id', $this->knowledgeId)
            ->update(['status' => 'failed']);
        app(TaskManager::class)->markTaskFailed($this->taskId, $exception->getMessage());
    }

    private function syncPaperRecord(KnowledgeExplanation $record, string $pdfUrl): void
    {
        $paperId = (string) ($record->knowledge_id ?? '');
        if ($paperId === '') {
            return;
        }

        $displayCode = (string) preg_replace('/^(paper_|knowledge_)/', '', $paperId);
        if ($displayCode === '') {
            $displayCode = $paperId;
        }

        Paper::query()->updateOrCreate(
            ['paper_id' => $paperId],
            [
                'student_id' => (string) ($record->student_id ?? ''),
                'teacher_id' => (string) ($record->teacher_id ?? ''),
                'params' => [
                    'source' => 'knowledge_explanation',
                    'knowledge_id' => $paperId,
                    'kp_codes' => is_array($record->kp_codes) ? $record->kp_codes : [],
                ],
                'paper_name' => '知识点讲解_' . $displayCode,
                'paper_type' => 22,
                'total_questions' => 0,
                'total_score' => 0,
                'status' => 'completed',
                'difficulty_category' => null,
                'exam_pdf_url' => $pdfUrl,
                'grading_pdf_url' => null,
                'all_pdf_url' => $pdfUrl,
                'completed_at' => now(),
            ]
        );
    }

    private function buildKnowledgeExamContent(KnowledgeExplanation $record, string $pdfUrl): array
    {
        $paperId = (string) ($record->knowledge_id ?? '');
        $displayCode = (string) preg_replace('/^(paper_|knowledge_)/', '', $paperId);
        if ($displayCode === '') {
            $displayCode = $paperId;
        }
        $kpCodes = is_array($record->kp_codes) ? array_values($record->kp_codes) : [];

        return [
            'paper_info' => [
                'paper_id' => $paperId,
                'paper_name' => '知识点讲解_' . $displayCode,
                'student_id' => (string) ($record->student_id ?? ''),
                'teacher_id' => (string) ($record->teacher_id ?? ''),
                'total_questions' => 0,
                'total_score' => 0,
                'difficulty_category' => null,
                'exam_code' => $displayCode,
                'grading_code' => null,
                'paper_id_num' => $displayCode,
            ],
            'knowledge_points' => $kpCodes,
            'statistics' => [
                'type_distribution' => [
                    'choice' => 0,
                    'fill' => 0,
                    'answer' => 0,
                ],
                'difficulty_distribution' => [],
                'knowledge_point_distribution' => array_fill_keys($kpCodes, 0),
                'average_difficulty' => null,
                'total_estimated_time' => 0,
            ],
            'pdfs' => [
                'all_pdf' => $pdfUrl,
            ],
            'source' => 'knowledge_explanation',
        ];
    }
}