<?php

namespace App\Services;

use App\Models\OCRRecord;
use App\Models\OCRQuestionResult;
use App\Models\Paper;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;

class IntelligentGradingService
{
    /**
     * 对OCR结果进行AI判分（使用分析项目API）
     */
    public function gradeSubmission(int $ocrRecordId): array
    {
        $ocrRecord = OCRRecord::findOrFail($ocrRecordId);
        $ocrResults = OCRQuestionResult::where('ocr_record_id', $ocrRecordId)->get();

        Log::info('开始AI判分', ['ocr_record_id' => $ocrRecordId, 'question_count' => $ocrResults->count()]);

        try {
            // 调用分析项目API进行判分
            $apiUrl = env('LEARNING_ANALYTICS_API', 'http://localhost:8000') . '/api/grade-submission';

            $response = Http::timeout(60)->post($apiUrl, [
                'ocr_record_id' => $ocrRecordId,
                'paper_title' => $ocrRecord->paper_title,
                'questions' => $ocrResults->toArray(),
            ]);

            if (!$response->successful()) {
                throw new \Exception('分析API调用失败：' . $response->body());
            }

            $data = $response->json();

            // 更新OCR结果
            foreach ($data['question_results'] as $result) {
                OCRQuestionResult::where('ocr_record_id', $ocrRecordId)
                    ->where('question_number', $result['question_number'])
                    ->update([
                        'ai_score' => $result['score'],
                        'ai_feedback' => $result['feedback'],
                        'ai_confidence' => $result['confidence'] ?? 0.9,
                        'ai_analyzed_at' => now(),
                    ]);
            }

            // 更新总成绩到papers表（如果存在对应的paper记录）
            if (!empty($data['total_score'])) {
                $paper = Paper::where('paper_name', $ocrRecord->paper_title)->first();
                if ($paper) {
                    $paper->update(['total_score' => $data['total_score']]);
                }
            }

            Log::info('AI判分完成', [
                'ocr_record_id' => $ocrRecordId,
                'total_score' => $data['total_score'] ?? 0,
            ]);

            return $data;

        } catch (\Exception $e) {
            Log::error('AI判分失败', [
                'ocr_record_id' => $ocrRecordId,
                'error' => $e->getMessage(),
            ]);

            // 使用本地简单判分作为后备
            return $this->localGradingFallback($ocrRecordId, $ocrResults);
        }
    }

    /**
     * 本地简单判分（后备方案）
     */
    protected function localGradingFallback(int $ocrRecordId, $ocrResults): array
    {
        Log::warning('使用本地判分作为后备方案', ['ocr_record_id' => $ocrRecordId]);

        $results = [];
        $totalScore = 0;

        foreach ($ocrResults as $question) {
            // 简化判分逻辑：根据答案置信度给分
            $score = $question->answer_confidence >= 0.8 ? 5.0 : 2.0;

            $question->update([
                'ai_score' => $score,
                'ai_feedback' => '基于置信度的模拟评分',
                'ai_confidence' => $question->answer_confidence,
                'ai_analyzed_at' => now(),
            ]);

            $results[] = [
                'question_number' => $question->question_number,
                'score' => $score,
                'feedback' => '基于置信度的模拟评分',
                'confidence' => $question->answer_confidence,
            ];

            $totalScore += $score;
        }

        return [
            'total_score' => $totalScore,
            'question_results' => $results,
            'method' => 'local_fallback',
        ];
    }
}