<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Services\TaskManager;
use App\Services\LocalAIAnalysisService;
use App\Services\StudentAnswerAnalysisService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;

class StudentAnswerAnalysisController extends Controller
{
    public function __construct(
        private readonly TaskManager $taskManager,
        private readonly LocalAIAnalysisService $aiAnalysisService,
        private readonly StudentAnswerAnalysisService $answerAnalysisService
    ) {}

    /**
     * 接收学生作答结果并进行分析
     *
     * @param Request $request
     * @return JsonResponse
     */
    public function submitAnswers(Request $request): JsonResponse
    {
        // 优先从JSON body获取参数，支持向后兼容
        $payload = $request->json()->all();
        if (empty($payload)) {
            $payload = $request->all();
        }

        // student_id类型转换：支持数字和字符串输入
        if (isset($payload['student_id'])) {
            $payload['student_id'] = (string) $payload['student_id'];
        }

        // 验证参数
        $validator = validator($payload, [
            'paper_id' => 'required|string',
            'student_id' => 'required|string|min:1',
            'answers' => 'required|array',
            'answers.*.question_id' => 'required|string',
            'answers.*.question_number' => 'nullable|string',
            'answers.*.is_correct' => 'required|boolean',
            'answers.*.student_answer' => 'nullable|string',
            'answers.*.correct_answer' => 'nullable|string',
            'answers.*.score' => 'nullable|numeric',
            'answers.*.max_score' => 'nullable|numeric',
            'answers.*.step_scores' => 'nullable|array', // 简答题步骤得分
            'answers.*.knowledge_point' => 'nullable|string',
            'answers.*.question_type' => 'nullable|string',
            'answer_time' => 'nullable|timestamp',
            'submit_time' => 'nullable|timestamp',
            'source_system' => 'nullable|string',
            'callback_url' => 'nullable|url',
            'missing_questions' => 'nullable|array', // 缺题列表（可选）
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => '参数错误',
                'errors' => $validator->errors(),
            ], 422);
        }

        $data = $validator->validated();

        try {
            // 使用TaskManager创建异步任务
            $taskId = $this->taskManager->createTask(
                TaskManager::TASK_TYPE_ANALYSIS,
                array_merge($data, ['type' => 'answer_analysis'])
            );

            Log::info('StudentAnswerAnalysisController: 收到作答结果', [
                'task_id' => $taskId,
                'paper_id' => $data['paper_id'],
                'student_id' => $data['student_id'],
                'answer_count' => count($data['answers']),
            ]);

            // 触发后台分析处理
            $this->processAnswerAnalysis($taskId, $data);

            return response()->json([
                'success' => true,
                'message' => '作答结果已提交，正在分析中...',
                'data' => [
                    'task_id' => $taskId,
                    'paper_id' => $data['paper_id'],
                    'student_id' => $data['student_id'],
                    'status' => 'processing',
                    'created_at' => now()->toISOString(),
                ],
            ]);

        } catch (\Exception $e) {
            Log::error('提交作答结果失败', [
                'paper_id' => $data['paper_id'] ?? 'unknown',
                'student_id' => $data['student_id'] ?? 'unknown',
                'error' => $e->getMessage(),
            ]);

            return response()->json([
                'success' => false,
                'message' => '提交失败：' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 查询分析任务状态
     */
    public function getAnalysisStatus(string $taskId): JsonResponse
    {
        try {
            $task = $this->taskManager->getTaskStatus($taskId);

            if (!$task) {
                return response()->json([
                    'success' => false,
                    'message' => '任务不存在',
                ], 404);
            }

            return response()->json([
                'success' => true,
                'data' => $task,
            ]);

        } catch (\Exception $e) {
            Log::error('查询分析状态失败', [
                'task_id' => $taskId,
                'error' => $e->getMessage(),
            ]);

            return response()->json([
                'success' => false,
                'message' => '查询失败：' . $e->getMessage(),
            ], 500);
        }
    }

    /**
     * 处理作答分析（后台任务）
     */
    private function processAnswerAnalysis(string $taskId, array $data): void
    {
        try {
            $this->taskManager->updateTaskProgress($taskId, 10, '正在处理缺题（默认正确）...');

            // 处理缺题：对于没有提交的题目，默认标记为正确
            $allAnswers = $this->processMissingQuestions($data);

            $this->taskManager->updateTaskProgress($taskId, 30, '正在保存作答记录...');

            // 保存作答记录到数据库（包含缺题）
            $answerRecord = $this->answerAnalysisService->saveAnswerRecord([
                ...$data,
                'answers' => $allAnswers,
            ]);

            $this->taskManager->updateTaskProgress($taskId, 50, '正在分析每道题（包括缺题处理）...');

            // 简化分析：不调用AI，直接使用基础分析
            $questionAnalyses = [];
            foreach ($allAnswers as $answer) {
                $questionAnalyses[] = [
                    'question_id' => $answer['question_id'],
                    'question_number' => $answer['question_number'] ?? null,
                    'kp_code' => $answer['knowledge_point'] ?? null,
                    'student_answer' => $answer['student_answer'] ?? '',
                    'correct_answer' => $answer['correct_answer'] ?? '',
                    'is_correct' => $answer['is_correct'],
                    'score_obtained' => (float) ($answer['score'] ?? 0),
                    'max_score' => (float) ($answer['max_score'] ?? 10),
                    'difficulty' => 0.5,
                    'is_missing' => $answer['is_missing'] ?? false,
                    'model_used' => 'simple-rules',
                ];
            }

            $this->taskManager->updateTaskProgress($taskId, 60, '正在保存分析结果...');

            // 准备分析结果数据
            $analysisData = [
                'question_results' => $questionAnalyses,
                'total_questions' => count($questionAnalyses),
                'correct_count' => count(array_filter($questionAnalyses, function($q) { return $q['correct'] ?? false; })),
                'wrong_count' => count(array_filter($questionAnalyses, function($q) { return !($q['correct'] ?? true); })),
                'model_used' => $questionAnalyses[0]['model_used'] ?? 'unknown',
            ];

            // 保存分析结果
            $this->answerAnalysisService->saveAnalysisResults($answerRecord, $analysisData, $questionAnalyses);

            $this->taskManager->updateTaskProgress($taskId, 80, '正在生成掌握度快照...');

            // 生成掌握度快照（记录每次分析的掌握度变化）
            $masterySnapshot = $this->answerAnalysisService->createMasterySnapshot(
                $data['student_id'],
                $data['paper_id'],
                $answerRecord['record_id']
            );

            $this->taskManager->updateTaskProgress($taskId, 90, '正在生成学情分析报告...');

            // 生成学情分析报告
            $reportUrl = $this->generateLearningReport($taskId, $data, $answerRecord, $questionAnalyses, $masterySnapshot);

            // 标记任务完成
            $this->taskManager->markTaskCompleted($taskId, [
                'answer_record_id' => $answerRecord['record_id'],
                'analysis_id' => 'analysis_' . uniqid(),
                'mastery_snapshot_id' => $masterySnapshot['snapshot_id'] ?? null,
                'correct_count' => $answerRecord['correct_count'],
                'wrong_count' => $answerRecord['wrong_count'],
                'overall_mastery' => $masterySnapshot['overall_mastery'] ?? null,
                'report_url' => $reportUrl, // 学情分析报告URL
            ]);

            Log::info('作答分析完成', [
                'task_id' => $taskId,
                'paper_id' => $data['paper_id'],
                'student_id' => $data['student_id'],
                'answer_record_id' => $answerRecord['record_id'],
            ]);

            // 发送回调通知
            $this->taskManager->sendCallback($taskId);

        } catch (\Exception $e) {
            Log::error('作答分析失败', [
                'task_id' => $taskId,
                'paper_id' => $data['paper_id'],
                'student_id' => $data['student_id'],
                'error' => $e->getMessage(),
            ]);

            $this->taskManager->markTaskFailed($taskId, $e->getMessage());
        }
    }

    /**
     * 获取题目文本内容
     */
    private function getQuestionText(string $questionId): string
    {
        try {
            // 这里可以调用 QuestionBankService 获取题目内容
            // 目前返回空字符串，让AI分析基于学生答案进行分析
            return '';
        } catch (\Exception $e) {
            Log::warning('获取题目文本失败', [
                'question_id' => $questionId,
                'error' => $e->getMessage(),
            ]);
            return '';
        }
    }

    /**
     * 处理缺题逻辑：对于没有提交的题目，默认标记为正确
     * 通过paper_id查询paper_question表获取总题数
     */
    private function processMissingQuestions(array $data): array
    {
        $answers = $data['answers'] ?? [];
        $submittedQuestionIds = array_column($answers, 'question_id');

        // 获取缺题列表
        $missingQuestions = $data['missing_questions'] ?? [];

        // 如果没有提供missing_questions，通过paper_id查询paper_question表
        if (empty($missingQuestions)) {
            try {
                // 通过paper_id查询paper_question表获取题目总数
                $totalQuestions = DB::table('paper_questions')
                    ->where('paper_id', $data['paper_id'])
                    ->count();

                Log::info('从paper_question表获取题目总数', [
                    'paper_id' => $data['paper_id'],
                    'total_questions' => $totalQuestions,
                    'submitted_count' => count($submittedQuestionIds),
                ]);

                // 自动生成缺题列表（根据paper_question表的题目编号）
                $allQuestionIds = DB::table('paper_questions')
                    ->where('paper_id', $data['paper_id'])
                    ->pluck('question_id')
                    ->toArray();

                foreach ($allQuestionIds as $questionId) {
                    if (!in_array($questionId, $submittedQuestionIds)) {
                        $missingQuestions[] = $questionId;
                    }
                }

            } catch (\Exception $e) {
                Log::warning('查询paper_question表失败，跳过缺题处理', [
                    'paper_id' => $data['paper_id'],
                    'error' => $e->getMessage(),
                ]);
            }
        }

        // 为每个缺题创建默认正确的记录
        foreach ($missingQuestions as $missingQuestionId) {
            $answers[] = [
                'question_id' => $missingQuestionId,
                'question_number' => $missingQuestionId,
                'is_correct' => true, // 缺题默认正确
                'student_answer' => '[缺题]',
                'correct_answer' => '[未作答]',
                'score' => 0, // 缺题不计分
                'max_score' => 0,
                'knowledge_point' => null,
                'question_type' => 'missing',
                'is_missing' => true, // 标记为缺题
                'answer_time' => $data['answer_time'] ?? now(),
            ];
        }

        Log::info('缺题处理完成', [
            'paper_id' => $data['paper_id'],
            'submitted_count' => count($data['answers'] ?? []),
            'missing_count' => count($missingQuestions),
            'total_count' => count($answers),
        ]);

        return $answers;
    }

    /**
     * 生成学情分析报告并异步生成PDF
     */
    private function generateLearningReport(
        string $taskId,
        array $data,
        array $answerRecord,
        array $questionAnalyses,
        ?array $masterySnapshot
    ): ?string {
        try {
            // 构建报告数据
            $reportData = [
                'task_id' => $taskId,
                'paper_id' => $data['paper_id'],
                'student_id' => $data['student_id'],
                'submit_time' => now()->toISOString(),
                'answer_record' => $answerRecord,
                'question_analyses' => $questionAnalyses,
                'mastery_snapshot' => $masterySnapshot,
                'report_type' => 'learning_analysis',
            ];

            // 创建异步任务生成PDF
            $pdfTaskId = $this->taskManager->createTask(
                TaskManager::TASK_TYPE_PDF,
                array_merge($reportData, ['type' => 'learning_report'])
            );

            Log::info('学情分析报告任务已创建', [
                'pdf_task_id' => $pdfTaskId,
                'paper_id' => $data['paper_id'],
                'student_id' => $data['student_id'],
            ]);

            // 返回报告URL（异步生成）
            return route('api.reports.learning', [
                'task_id' => $pdfTaskId,
                'student_id' => $data['student_id'],
            ]);

        } catch (\Exception $e) {
            Log::error('生成学情分析报告失败', [
                'task_id' => $taskId,
                'error' => $e->getMessage(),
            ]);
            return null;
        }
    }

    /**
     * 获取学生学习历史
     */
    public function getStudentLearningHistory(string $studentId): JsonResponse
    {
        try {
            $history = $this->answerAnalysisService->getStudentLearningHistory($studentId);

            return response()->json([
                'success' => true,
                'data' => $history,
            ]);

        } catch (\Exception $e) {
            Log::error('获取学习历史失败', [
                'student_id' => $studentId,
                'error' => $e->getMessage(),
            ]);

            return response()->json([
                'success' => false,
                'message' => '获取失败：' . $e->getMessage(),
            ], 500);
        }
    }
}