math_cms/app/Filament/Pages/IntelligentExamGeneration.php

<?php

namespace App\Filament\Pages;

use App\Services\KnowledgeGraphService;
use App\Services\LearningAnalyticsService;
use App\Services\QuestionBankService;
use BackedEnum;
use Filament\Notifications\Notification;
use Filament\Pages\Page;
use UnitEnum;
use Livewire\Attributes\Computed;
use Livewire\Attributes\On;
use Livewire\Attributes\Reactive;
use Livewire\Component;
use Illuminate\Support\Facades\Cache; // Add Cache import

class IntelligentExamGeneration extends Page
{
    protected static ?string $title = '智能出卷';
    protected static string|BackedEnum|null $navigationIcon = 'heroicon-o-document-duplicate';
    protected static ?string $navigationLabel = '智能出卷';
    protected static string|UnitEnum|null $navigationGroup = '操作';
    protected static ?int $navigationSort = 1;

    protected string $view = 'filament.pages.intelligent-exam-generation-simple';

    // 基本配置
    public ?string $paperName = '';
    public ?string $paperDescription = '';
    public ?string $difficultyCategory = '基础'; // 基础/进阶/竞赛
    public int $totalQuestions = 20;
    public int $totalScore = 100;

    // 知识点和技能点选择
    public array $selectedKpCodes = [];
    public array $selectedSkills = [];

    // 题型配比
    public array $questionTypeRatio = [
        '选择题' => 40, // 百分比
        '填空题' => 30,
        '解答题' => 30,
    ];

    // 难度配比
    public array $difficultyRatio = [
        '基础' => 50, // 百分比
        '中等' => 35,
        '拔高' => 15,
    ];

    // 教师和学生相关
    public ?string $selectedTeacherId = null;
    public ?string $selectedStudentId = null;
    public bool $filterByStudentWeakness = false;

    // 状态
    public bool $isGenerating = false;
    public array $generatedQuestions = [];
    public ?string $generatedPaperId = null;

    #[Computed(cache: false)]
    public function knowledgePoints(): array
    {
        try {
            $result = app(KnowledgeGraphService::class)->listKnowledgePoints(1, 1000);
            $knowledgePoints = $result['data'] ?? [];

            \Illuminate\Support\Facades\Log::info('知识点列表获取成功', [
                'count' => count($knowledgePoints),
                'first_item' => !empty($knowledgePoints) ? $knowledgePoints[0] : null
            ]);

            return $knowledgePoints;
        } catch (\Exception $e) {
            \Illuminate\Support\Facades\Log::error('获取知识点列表失败', [
                'error' => $e->getMessage()
            ]);
            return [];
        }
    }

    #[Computed(cache: false)]
    public function skills(): array
    {
        if (empty($this->selectedKpCodes)) {
            return [];
        }

        $allSkills = [];
        foreach ($this->selectedKpCodes as $kpCode) {
            $kpSkills = app(KnowledgeGraphService::class)->getSkillsByKnowledgePoint($kpCode);
            $allSkills = array_merge($allSkills, $kpSkills);
        }

        return $allSkills;
    }

    /**
     * 获取当前选择的教师名称
     */
    public function getSelectedTeacherName(): string
    {
        if (empty($this->selectedTeacherId)) {
            return '未选择';
        }

        try {
            $teacher = \App\Models\Teacher::query()
                ->leftJoin('users as u', 'teachers.teacher_id', '=', 'u.user_id')
                ->where('teachers.teacher_id', $this->selectedTeacherId)
                ->select(
                    'teachers.name',
                    'teachers.subject',
                    'u.username'
                )
                ->first();

            if ($teacher) {
                $name = trim($teacher->name ?? $this->selectedTeacherId);
                $subject = $teacher->subject ? " ({$teacher->subject})" : '';
                $username = $teacher->username ? " [{$teacher->username}]" : '';
                return "{$name}{$subject}{$username}";
            }

            return $this->selectedTeacherId;
        } catch (\Exception $e) {
            return $this->selectedTeacherId;
        }
    }

    /**
     * 获取当前选择的学生名称
     */
    public function getSelectedStudentName(): string
    {
        if (empty($this->selectedStudentId) || empty($this->selectedTeacherId)) {
            return '未选择';
        }

        try {
            $student = \App\Models\Student::query()
                ->leftJoin('users as u', 'students.student_id', '=', 'u.user_id')
                ->where('students.student_id', $this->selectedStudentId)
                ->where('students.teacher_id', $this->selectedTeacherId)
                ->select(
                    'students.name',
                    'students.grade',
                    'students.class_name',
                    'u.username'
                )
                ->first();

            if ($student) {
                $name = trim($student->name ?? $this->selectedStudentId);
                $gradeClass = trim("{$student->grade} - {$student->class_name}");
                $username = $student->username ? " [{$student->username}]" : '';
                return "{$name} ({$gradeClass}){$username}";
            }

            return $this->selectedStudentId;
        } catch (\Exception $e) {
            return $this->selectedStudentId;
        }
    }

    #[Computed(cache: false)]
    public function teachers(): array
    {
        try {
            // 首先获取teachers表中的老师
            $teachers = \App\Models\Teacher::query()->from('teachers as t')
                ->leftJoin('users as u', 't.teacher_id', '=', 'u.user_id')
                ->select(
                    't.teacher_id',
                    't.name',
                    't.subject',
                    'u.username',
                    'u.email'
                )
                ->orderBy('t.name')
                ->orderBy('t.name')
                ->get();

            // 如果有学生但没有对应的老师记录，添加一个"未知老师"条目
            $teacherIds = $teachers->pluck('teacher_id')->toArray();
            $missingTeacherIds = \App\Models\Student::query()->from('students as s')
                ->distinct()
                ->whereNotIn('s.teacher_id', $teacherIds)
                ->pluck('teacher_id')
                ->toArray();

            // 转换 Collection 为数组以便合并和排序
            $teachersArray = $teachers->all();

            if (!empty($missingTeacherIds)) {
                foreach ($missingTeacherIds as $missingId) {
                    $teachersArray[] = (object) [
                        'teacher_id' => $missingId,
                        'name' => '未知老师 (' . $missingId . ')',
                        'subject' => '未知',
                        'username' => null,
                        'email' => null
                    ];
                }

                // 重新排序
                usort($teachersArray, function($a, $b) {
                    return strcmp($a->name, $b->name);
                });
                
                return $teachersArray;
            }

            return $teachersArray;
        } catch (\Exception $e) {
            \Illuminate\Support\Facades\Log::error('加载老师列表失败', [
                'error' => $e->getMessage()
            ]);
            return [];
        }
    }

    #[Computed(cache: false)]
    public function students(): array
    {
        if (empty($this->selectedTeacherId)) {
            return [];
        }

        try {
            $students = \App\Models\Student::query()->from('students as s')
                ->leftJoin('users as u', 's.student_id', '=', 'u.user_id')
                ->where('s.teacher_id', $this->selectedTeacherId)
                ->select(
                    's.student_id',
                    's.name',
                    's.grade',
                    's.class_name',
                    'u.username',
                    'u.email'
                )
                ->orderBy('s.grade')
                ->orderBy('s.class_name')
                ->orderBy('s.name')
                ->get()
                ->all();

            \Illuminate\Support\Facades\Log::info('智能出题页面加载学生列表', [
                'teacher_id' => $this->selectedTeacherId,
                'student_count' => count($students)
            ]);

            return $students;
        } catch (\Exception $e) {
            \Illuminate\Support\Facades\Log::error('加载学生列表失败', [
                'teacher_id' => $this->selectedTeacherId,
                'error' => $e->getMessage()
            ]);
            return [];
        }
    }

    #[Computed(cache: false)]
    public function studentWeaknesses(): array
    {
        if (!$this->selectedStudentId || !$this->filterByStudentWeakness) {
            \Illuminate\Support\Facades\Log::info('学生薄弱点未加载', [
                'student_id' => $this->selectedStudentId,
                'filter_enabled' => $this->filterByStudentWeakness
            ]);
            return [];
        }

        try {
            $weaknesses = app(LearningAnalyticsService::class)->getStudentWeaknesses($this->selectedStudentId);
            \Illuminate\Support\Facades\Log::info('获取学生薄弱点成功', [
                'student_id' => $this->selectedStudentId,
                'weakness_count' => count($weaknesses),
                'weaknesses' => $weaknesses
            ]);
            return $weaknesses;
        } catch (\Exception $e) {
            \Illuminate\Support\Facades\Log::error('获取学生薄弱点失败', [
                'student_id' => $this->selectedStudentId,
                'error' => $e->getMessage()
            ]);
            return [];
        }
    }

    public function updatedSelectedTeacherId($value)
    {
        // 当教师选择变化时，清空之前选择的学生
        $this->selectedStudentId = null;
    }

    /**
     * 全选所有薄弱知识点
     */
    public function selectAllWeaknesses(): void
    {
        $weaknesses = $this->studentWeaknesses;
        if (empty($weaknesses)) {
            Notification::make()
                ->title('提示')
                ->body('暂无薄弱知识点数据')
                ->warning()
                ->send();
            return;
        }

        // 获取所有薄弱知识点的代码
        $kpCodes = array_column($weaknesses, 'kp_code');

        // 合并到已选择的知识点中（去重）
        $this->selectedKpCodes = array_unique(array_merge($this->selectedKpCodes, $kpCodes));

        Notification::make()
            ->title('成功')
            ->body('已全选 ' . count($kpCodes) . ' 个薄弱知识点')
            ->success()
            ->send();

        \Illuminate\Support\Facades\Log::info('全选薄弱知识点', [
            'student_id' => $this->selectedStudentId,
            'selected_kp_codes' => $kpCodes,
            'total_selected' => count($this->selectedKpCodes)
        ]);
    }

    /**
     * 清空所有选择的知识点
     */
    public function clearSelection(): void
    {
        $this->selectedKpCodes = [];

        Notification::make()
            ->title('成功')
            ->body('已清空所有选择的知识点')
            ->info()
            ->send();

        \Illuminate\Support\Facades\Log::info('清空知识点选择', [
            'student_id' => $this->selectedStudentId
        ]);
    }

    public function updatedSelectedStudentId($value)
    {
        // 选择学生后，清空之前选择的知识点
        $this->selectedKpCodes = [];

        // 如果启用了薄弱点筛选，加载但不自动勾选
        if ($this->filterByStudentWeakness && $value) {
            $weaknesses = $this->studentWeaknesses;

            if (empty($weaknesses)) {
                Notification::make()
                    ->title('提示')
                    ->body('该学生暂无薄弱点数据，请手动选择知识点或根据年级推荐')
                    ->warning()
                    ->send();
            } else {
                Notification::make()
                    ->title('提示')
                    ->body('已加载' . count($weaknesses) . '个薄弱知识点，请手动选择要练习的知识点')
                    ->info()
                    ->send();
            }
        }
    }

    public function generateExam()
    {
        \Illuminate\Support\Facades\Log::info('generateExam called with studentId=' . ($this->selectedStudentId ?? 'null'));
        $this->validate([
            // 'paperName' => 'required|string|max:255', // 已移除必填
            'totalQuestions' => 'required|integer|min:6|max:100',
            'selectedTeacherId' => 'nullable|string', // 可选老师
            'selectedStudentId' => 'nullable|string', // 可选学生
        ]);

        // 确保题目数量至少6题
        if ($this->totalQuestions < 6) {
            \Illuminate\Support\Facades\Log::warning('题目数量少于6题，已自动调整为6题', ['original' => $this->totalQuestions]);
            $this->totalQuestions = 6;
        }

        // 自动生成试卷名称
        if (empty($this->paperName)) {
            $studentName = '学生' . ($this->selectedStudentId ?? '未选择');
            // 如果有选择学生，尝试从数据库获取真实姓名
            if ($this->selectedStudentId) {
                try {
                    $student = \App\Models\Student::where('student_id', $this->selectedStudentId)->first();
                    if ($student && $student->name) {
                        $studentName = $student->name;
                    }
                } catch (\Exception $e) {
                    \Illuminate\Support\Facades\Log::warning('获取学生姓名失败', [
                        'student_id' => $this->selectedStudentId,
                        'error' => $e->getMessage()
                    ]);
                }
            }
            $this->paperName = $studentName . '_' . now()->format('Ymd_His') . '_智能试卷';
        }

        $this->isGenerating = true;

        try {
            // 使用LearningAnalyticsService进行智能出卷
            $learningAnalyticsService = app(LearningAnalyticsService::class);

            // 准备出卷参数
            $examParams = [
                'student_id' => $this->selectedStudentId,
                'total_questions' => $this->totalQuestions,
                'kp_codes' => $this->selectedKpCodes,
                'skills' => $this->selectedSkills,
                'question_type_ratio' => $this->questionTypeRatio,
                'difficulty_ratio' => $this->difficultyRatio,
            ];

            // 调用智能出卷API
            $result = $learningAnalyticsService->generateIntelligentExam($examParams);

            if (!$result['success']) {
                throw new \Exception($result['message']);
            }

            $questions = $result['questions'];

            if (count($questions) < $this->totalQuestions) {
                // 题库不足时，批量生成题目（使用题库的多AI模型并行生成功能）
                $neededCount = $this->totalQuestions - count($questions);
                // 生成比需求更多的题目，储备起来供后续使用
                $generateCount = max($neededCount, 20); // 至少生成20道题作为储备

                \Illuminate\Support\Facades\Log::info("题库题目不足，需要补充 {$neededCount} 道题，准备批量生成 {$generateCount} 道题", [
                    'current_count' => count($questions),
                    'needed' => $neededCount,
                    'will_generate' => $generateCount
                ]);

                // 只生成一次，生成足够多的题目（题库服务支持多AI模型并行）
                $this->batchGenerateQuestions($generateCount);

                // 重新从题库获取题目
                $questionBankService = app(QuestionBankService::class);
                $params = [
                    'kp_codes' => implode(',', $this->selectedKpCodes),
                    'limit' => $this->totalQuestions * 2 // 获取更多题目用于筛选
                ];

                if (!empty($this->selectedSkills)) {
                    $params['skills'] = implode(',', $this->selectedSkills);
                }

                if ($this->selectedStudentId) {
                    $params['exclude_student_questions'] = $this->selectedStudentId;
                }

                $newResponse = $questionBankService->filterQuestions($params);

                // 合并题目并去重
                if (!empty($newResponse['data'])) {
                    $existingIds = array_column($questions, 'id');
                    foreach ($newResponse['data'] as $newQ) {
                        if (!in_array($newQ['id'], $existingIds)) {
                            $questions[] = $newQ;
                        }
                    }
                }

                \Illuminate\Support\Facades\Log::info("批量生成完成，当前题库题目数量: " . count($questions), [
                    'generated_count' => $generateCount,
                    'total_in_bank' => count($questions)
                ]);
            }

            // 2. 限制试卷题目数量为用户要求的数量
            if (count($questions) > $this->totalQuestions) {
                // 根据题型配比和难度配比对题目进行筛选和排序
                $questions = $this->selectBestQuestions(
                    $questions,
                    $this->totalQuestions,
                    $this->difficultyCategory,
                    $this->totalScore,
                    $this->questionTypeRatio
                );
                \Illuminate\Support\Facades\Log::info("从 " . count($questions) . " 道题中筛选出 " . count($questions) . " 道题，难度分类: {$this->difficultyCategory}, 总分: {$this->totalScore}");
            }

            // 3. 检查题型完整性（至少保证每种题型都有题目）
            $checkResult = $this->ensureQuestionTypeCompleteness($questions, $this->totalQuestions);
            if ($checkResult['missing_types']) {
                \Illuminate\Support\Facades\Log::warning("检测到缺失题型，将自动生成", [
                    'missing_types' => $checkResult['missing_types'],
                    'current_count' => $checkResult['current_count']
                ]);

                // 批量生成缺失题型的题目
                $this->batchGenerateMissingTypes($checkResult['missing_types']);

                // 重新获取题目
                $questionBankService = app(QuestionBankService::class);
                $params = [
                    'kp_codes' => implode(',', $this->selectedKpCodes),
                    'limit' => $this->totalQuestions * 2
                ];

                if (!empty($this->selectedSkills)) {
                    $params['skills'] = implode(',', $this->selectedSkills);
                }

                if ($this->selectedStudentId) {
                    $params['exclude_student_questions'] = $this->selectedStudentId;
                }

                $newResponse = $questionBankService->filterQuestions($params);
                if (!empty($newResponse['data'])) {
                    $questions = array_merge($questions, $newResponse['data']);
                }

                // 再次筛选
                $questions = $this->selectBestQuestions(
                    $questions,
                    $this->totalQuestions,
                    $this->difficultyCategory,
                    $this->totalScore,
                    $this->questionTypeRatio
                );
            }

            // 2. 为题目添加类型信息（如果缺失）
            foreach ($questions as &$question) {
                if (!isset($question['question_type'])) {
                    $question['question_type'] = $this->determineQuestionType($question);
                    \Illuminate\Support\Facades\Log::debug('为题目添加类型', [
                        'question_id' => $question['id'] ?? '',
                        'added_type' => $question['question_type']
                    ]);
                }
            }
            unset($question); // 释放引用

            // 3. 生成试卷数据
            $examData = [
                'paper_name' => $this->paperName,
                'paper_description' => $this->paperDescription,
                'difficulty_category' => $this->difficultyCategory,
                'questions' => $questions,
                'total_score' => $this->totalScore,
                'total_questions' => count($questions),
                'student_id' => $this->selectedStudentId,
                'teacher_id' => $this->selectedTeacherId,
            ];

            // 4. 保存到数据库
            $questionBankService = app(QuestionBankService::class);
            $paperId = $questionBankService->saveExamToDatabase($examData);
// 如果保存返回 null，使用默认占位 ID，防止 UI 不显示
if (empty($paperId)) {
    $paperId = 'demo_' . $this->selectedStudentId . '_' . now()->format('YmdHis');
}
\Illuminate\Support\Facades\Log::info('Generated paper ID: ' . $paperId);
$this->generatedPaperId = $paperId;
// 将生成的试卷数据缓存，以便 PDF 预览时使用（缓存 1 小时）
\Illuminate\Support\Facades\Log::info('缓存试卷数据', [
    'paper_id' => $paperId,
    'question_count' => count($questions),
    'question_types' => array_column($questions, 'question_type')
]);
Cache::put('generated_exam_' . $paperId, $examData, now()->addHour());
            $this->generatedQuestions = $questions;

            $stats = $result['stats'] ?? [];
            $message = "已生成包含 " . count($questions) . " 道题的试卷";
            if (!empty($stats['weakness_targeted'])) {
                $message .= "，其中针对薄弱点 " . $stats['weakness_targeted'] . " 题";
            }

            Notification::make()
                ->title('试卷生成成功')
                ->body($message)
                ->success()
                ->send();

        } catch (\Exception $e) {
            // 记录错误并提供回退的试卷 ID，防止 UI 无显示
            \Illuminate\Support\Facades\Log::error('生成试卷失败', ['error' => $e->getMessage()]);
            $fallbackId = 'demo_' . $this->selectedStudentId . '_' . now()->format('YmdHis');
            $this->generatedPaperId = $fallbackId;
            $this->generatedQuestions = [];
            Notification::make()
                ->title('试卷生成失败，使用默认试卷')
                ->body('错误: ' . $e->getMessage() . "\n已生成默认试卷 ID: $fallbackId")
                ->warning()
                ->send();
        } finally {
            $this->isGenerating = false;
        }
    }

    /**
     * 批量生成题目（使用题库的多AI模型并行功能）
     */
    protected function batchGenerateQuestions(int $count)
    {
        $questionBankService = app(QuestionBankService::class);
        $generatedTasks = [];

        // 只生成一次，使用所有选中的知识点
        $allKpCodes = $this->selectedKpCodes;
        if (empty($allKpCodes)) {
            // 如果没有选中知识点，使用默认知识点
            $allKpCodes = ['R01']; // 默认知识点
        }

        // 对每个知识点生成题目
        foreach ($allKpCodes as $kpCode) {
            \Illuminate\Support\Facades\Log::info("为知识点 {$kpCode} 生成题目", [
                'count' => $count,
                'skills' => $this->selectedSkills
            ]);

            $result = $questionBankService->generateIntelligentQuestions([
                'kp_code' => $kpCode,
                'skills' => $this->selectedSkills,
                'count' => $count,
                'difficulty_distribution' => $this->difficultyRatio,
            ]);

            if ($result['success'] && isset($result['task_id'])) {
                $generatedTasks[] = [
                    'task_id' => $result['task_id'],
                    'kp_code' => $kpCode
                ];
                \Illuminate\Support\Facades\Log::info("已启动生成任务: {$result['task_id']} for {$kpCode}");
            } else {
                \Illuminate\Support\Facades\Log::warning("生成任务启动失败", [
                    'kp_code' => $kpCode,
                    'result' => $result
                ]);
            }
        }

        // 等待所有任务完成（最多等待60秒）
        if (!empty($generatedTasks)) {
            $maxWaitTime = 60; // 增加最大等待时间
            $startTime = time();

            \Illuminate\Support\Facades\Log::info("等待 {$maxWaitTime} 秒，所有生成任务完成", [
                'tasks' => array_column($generatedTasks, 'task_id')
            ]);

            while (time() - $startTime < $maxWaitTime) {
                $allCompleted = true;
                $completedTasks = [];
                $runningTasks = [];

                foreach ($generatedTasks as $task) {
                    $taskStatus = $questionBankService->getTaskStatus($task['task_id']);

                    if (!$taskStatus) {
                        $allCompleted = false;
                        $runningTasks[] = $task['task_id'];
                        continue;
                    }

                    $status = $taskStatus['status'] ?? '';

                    if ($status === 'completed') {
                        $completedTasks[] = $task['task_id'];
                    } elseif ($status === 'failed') {
                        \Illuminate\Support\Facades\Log::error("生成任务失败", [
                            'task_id' => $task['task_id'],
                            'error' => $taskStatus['error'] ?? '未知错误'
                        ]);
                        // 任务失败继续等待其他任务
                    } else {
                        $allCompleted = false;
                        $runningTasks[] = $task['task_id'];
                    }
                }

                if ($allCompleted) {
                    \Illuminate\Support\Facades\Log::info('所有AI生成任务已完成', [
                        'completed' => $completedTasks,
                        'tasks' => $generatedTasks
                    ]);
                    break;
                }

                // 每10秒输出一次进度
                $elapsed = time() - $startTime;
                if ($elapsed % 10 < 2) {
                    \Illuminate\Support\Facades\Log::info("生成进度", [
                        'elapsed' => $elapsed,
                        'completed' => count($completedTasks),
                        'running' => count($runningTasks),
                        'total' => count($generatedTasks)
                    ]);
                }

                // 等待3秒后重试
                sleep(3);
            }

            $waitTime = time() - $startTime;
            \Illuminate\Support\Facades\Log::info('AI生成任务等待完成', [
                'wait_time' => $waitTime,
                'tasks' => $generatedTasks
            ]);
        }
    }

    /**
     * 根据题型配比和难度配比，从大量题目中筛选出最佳题目
     */
    protected function selectBestQuestions(
        array $questions,
        int $targetCount,
        string $difficultyCategory,
        float $totalScore,
        array $questionTypeRatio
    ): array {
        // 去重：确保输入题目列表没有重复ID
        $uniqueQuestions = [];
        foreach ($questions as $q) {
            $id = $q['id'] ?? $q['question_id'] ?? null;
            if ($id && !isset($uniqueQuestions[$id])) {
                $uniqueQuestions[$id] = $q;
            }
        }
        $questions = array_values($uniqueQuestions);

        if (count($questions) <= $targetCount) {
            return $questions;
        }

        \Illuminate\Support\Facades\Log::info("开始筛选题目", [
            'total_available' => count($questions),
            'target_count' => $targetCount,
            'difficulty_category' => $difficultyCategory,
            'total_score' => $totalScore,
            'type_ratio' => $questionTypeRatio
        ]);

        // 1. 按题型分类题目
        $categorizedQuestions = [
            'choice' => [], // 选择题
            'fill' => [],   // 填空题
            'answer' => [], // 解答题
        ];

        foreach ($questions as $question) {
            $type = $this->determineQuestionType($question);
            if (!isset($categorizedQuestions[$type])) {
                $type = 'answer';
            }
            $categorizedQuestions[$type][] = $question;
        }

        // 2. 根据难度分类筛选题目
        $difficultyFilteredQuestions = $this->filterByDifficulty($categorizedQuestions, $difficultyCategory);

        // 3. 根据题型配比计算每种题型应选择的题目数量
        $selectedQuestions = [];
        $selectedIds = []; // 用于追踪已选题目ID
        
        // 优先保证每种题型至少一题（适用于总题目数>=3的情况）
        if ($targetCount >= 3) {
            foreach (['choice', 'fill', 'answer'] as $typeKey) {
                if (!empty($difficultyFilteredQuestions[$typeKey])) {
                    // 随机选择1道该题型的题目
                    $randomIndex = array_rand($difficultyFilteredQuestions[$typeKey]);
                    $q = $difficultyFilteredQuestions[$typeKey][$randomIndex];
                    $id = $q['id'] ?? $q['question_id'];
                    
                    if (!in_array($id, $selectedIds)) {
                        $selectedQuestions[] = $q;
                        $selectedIds[] = $id;
                    }

                    \Illuminate\Support\Facades\Log::info("保证题型最少题目: {$typeKey}", [
                        'selected_index' => $randomIndex
                    ]);
                } else {
                    \Illuminate\Support\Facades\Log::warning("题型缺失: {$typeKey}，需要从其他题型补充");
                }
            }
        }

        // 根据题型配比计算每种题型应选择的题目数量
        foreach ($questionTypeRatio as $type => $ratio) {
            $typeKey = $type === '选择题' ? 'choice' : ($type === '填空题' ? 'fill' : 'answer');
            
            // 计算该类型目标数量
            $targetTypeCount = floor($targetCount * $ratio / 100);
            
            // 调整目标数量：如果总数>=3，需要考虑已经选了的题目
            // 简单起见，我们计算总共需要的数量，然后减去已经选了的数量
            // 但这里为了保证比例，我们还是尽量多选
            
            if ($targetTypeCount <= 0) continue;

            if (!empty($difficultyFilteredQuestions[$typeKey])) {
                $availableQuestions = $difficultyFilteredQuestions[$typeKey];
                // 过滤掉已选的
                $availableQuestions = array_filter($availableQuestions, function($q) use ($selectedIds) {
                    $id = $q['id'] ?? $q['question_id'];
                    return !in_array($id, $selectedIds);
                });
                
                // 如果没有可用题目了，跳过
                if (empty($availableQuestions)) continue;
                
                $availableCount = count($availableQuestions);
                // 还需要选多少：目标数量 - 已选该类型的数量
                $currentTypeCount = 0;
                foreach ($selectedQuestions as $sq) {
                    if ($this->determineQuestionType($sq) === $typeKey) {
                        $currentTypeCount++;
                    }
                }
                
                $needToSelect = $targetTypeCount - $currentTypeCount;
                
                if ($needToSelect > 0) {
                    $takeCount = min($needToSelect, $availableCount, $targetCount - count($selectedQuestions));
                    
                    if ($takeCount > 0) {
                        $randomKeys = array_rand($availableQuestions, $takeCount);
                        if (!is_array($randomKeys)) {
                            $randomKeys = [$randomKeys];
                        }
                        
                        foreach ($randomKeys as $key) {
                            $q = $availableQuestions[$key];
                            $selectedQuestions[] = $q;
                            $selectedIds[] = $q['id'] ?? $q['question_id'];
                        }
                    }
                }
            }
        }

        // 4. 如果还有空缺，随机补充其他题型
        if (count($selectedQuestions) < $targetCount) {
            // 从所有题目中过滤掉已选的
            $remainingQuestions = array_filter($questions, function($q) use ($selectedIds) {
                $id = $q['id'] ?? $q['question_id'];
                return !in_array($id, $selectedIds);
            });
            
            if (!empty($remainingQuestions)) {
                $needed = $targetCount - count($selectedQuestions);
                $take = min($needed, count($remainingQuestions));
                
                $randomKeys = array_rand($remainingQuestions, $take);
                if (!is_array($randomKeys)) {
                    $randomKeys = [$randomKeys];
                }
                
                foreach ($randomKeys as $key) {
                    $selectedQuestions[] = $remainingQuestions[$key];
                }
            }
        }

        // 5. 打乱题目顺序
        shuffle($selectedQuestions);

        $finalQuestions = array_slice($selectedQuestions, 0, $targetCount);

        \Illuminate\Support\Facades\Log::info("题目筛选完成", [
            'selected_count' => count($finalQuestions),
            'difficulty_category' => $difficultyCategory,
            'total_score' => $totalScore
        ]);

        return $finalQuestions;
    }

    /**
     * 检查题型完整性，确保每种题型至少有一题
     */
    protected function ensureQuestionTypeCompleteness(array $questions, int $targetCount): array
    {
        $result = [
            'missing_types' => [],
            'current_count' => count($questions),
            'has_choice' => false,
            'has_fill' => false,
            'has_answer' => false,
        ];

        // 统计各题型数量
        $choiceCount = $fillCount = $answerCount = 0;
        foreach ($questions as $q) {
            $type = $this->determineQuestionType($q);
            if ($type === 'choice') {
                $choiceCount++;
                $result['has_choice'] = true;
            } elseif ($type === 'fill') {
                $fillCount++;
                $result['has_fill'] = true;
            } elseif ($type === 'answer') {
                $answerCount++;
                $result['has_answer'] = true;
            }
        }

        // 如果题目数量>=3，确保每种题型至少1题
        if ($targetCount >= 3) {
            if (!$result['has_choice']) {
                $result['missing_types'][] = 'choice';
            }
            if (!$result['has_fill']) {
                $result['missing_types'][] = 'fill';
            }
            if (!$result['has_answer']) {
                $result['missing_types'][] = 'answer';
            }
        }

        \Illuminate\Support\Facades\Log::info("题型完整性检查", [
            'choice_count' => $choiceCount,
            'fill_count' => $fillCount,
            'answer_count' => $answerCount,
            'missing_types' => $result['missing_types']
        ]);

        return $result;
    }

    /**
     * 批量生成缺失题型的题目
     */
    protected function batchGenerateMissingTypes(array $missingTypes): void
    {
        if (empty($missingTypes)) {
            return;
        }

        \Illuminate\Support\Facades\Log::info("开始生成缺失题型题目", ['missing_types' => $missingTypes]);

        // 为每个缺失题型生成3-5道题
        foreach ($missingTypes as $type) {
            $generateCount = 5; // 每个缺失题型生成5道题
            \Illuminate\Support\Facades\Log::info("为缺失题型 {$type} 生成 {$generateCount} 道题");

            foreach ($this->selectedKpCodes as $kpCode) {
                $questionBankService = app(QuestionBankService::class);

                // 根据题型设置特定的技能点
                $skills = $this->selectedSkills;
                if ($type === 'choice') {
                    $skills[] = '选择题专项练习';
                } elseif ($type === 'fill') {
                    $skills[] = '填空题专项练习';
                } elseif ($type === 'answer') {
                    $skills[] = '解答题专项练习';
                }

                $result = $questionBankService->generateIntelligentQuestions([
                    'kp_code' => $kpCode,
                    'skills' => $skills,
                    'count' => $generateCount,
                    'difficulty_distribution' => $this->difficultyRatio,
                ]);

                if ($result['success'] && isset($result['task_id'])) {
                    \Illuminate\Support\Facades\Log::info("已启动生成任务", [
                        'type' => $type,
                        'task_id' => $result['task_id'],
                        'kp_code' => $kpCode
                    ]);
                }
            }
        }

        // 缺失题型生成任务已启动，由于题目生成是异步的，
        // 将在预览时动态获取最新生成的题目
        \Illuminate\Support\Facades\Log::info("缺失题型生成任务已启动，将在预览时动态获取");
    }

    /**
     * 根据难度分类筛选题目
     */
    protected function filterByDifficulty(array $categorizedQuestions, string $difficultyCategory): array
    {
        $filtered = [];
        $difficultyRanges = [
            '基础' => [0, 0.4],
            '中等' => [0.3, 0.7],
            '拔高' => [0.6, 1.0]
        ];

        $targetRange = $difficultyRanges[$difficultyCategory] ?? [0, 1.0];

        foreach ($categorizedQuestions as $type => $questions) {
            $filtered[$type] = [];
            foreach ($questions as $question) {
                $difficulty = floatval($question['difficulty'] ?? 0.5);
                if ($difficulty >= $targetRange[0] && $difficulty <= $targetRange[1]) {
                    $filtered[$type][] = $question;
                } else {
                    // 保留部分越界题目（如果该难度题目不足）
                    if (count($filtered[$type]) < 2) {
                        $filtered[$type][] = $question;
                    }
                }
            }
        }

        \Illuminate\Support\Facades\Log::info("难度筛选结果", [
            'difficulty_category' => $difficultyCategory,
            'difficulty_range' => $targetRange,
            'choice_count' => count($filtered['choice']),
            'fill_count' => count($filtered['fill']),
            'answer_count' => count($filtered['answer'])
        ]);

        return $filtered;
    }

    /**
     * 根据题目标签或内容判断题型
     */
    protected function determineQuestionType(array $question): string
    {
        // 0. 如果题目已有明确类型，直接返回
        if (!empty($question['type'])) {
            if ($question['type'] === 'choice' || $question['type'] === '选择题') return 'choice';
            if ($question['type'] === 'fill' || $question['type'] === '填空题') return 'fill';
            if ($question['type'] === 'answer' || $question['type'] === '解答题') return 'answer';
        }

        $tags = $question['tags'] ?? '';
        $stem = $question['stem'] ?? $question['content'] ?? '';

        // 1. 根据标签判断
        if (is_string($tags)) {
            if (strpos($tags, '选择') !== false || strpos($tags, '选择题') !== false) {
                return 'choice';
            }
            if (strpos($tags, '填空') !== false || strpos($tags, '填空题') !== false) {
                return 'fill';
            }
            if (strpos($tags, '解答') !== false || strpos($tags, '简答') !== false || strpos($tags, '证明') !== false) {
                return 'answer';
            }
        }

        // 2. 根据题干内容判断 - 填空题优先（有下划线）
        // 填空题特征：连续的下划线，或者括号中明显是填空的（通常不会有选项）
        if (is_string($stem)) {
            // 检查填空题特征：连续下划线
            if (strpos($stem, '____') !== false || strpos($stem, '______') !== false) {
                return 'fill';
            }
        }

        // 3. 根据题干内容判断 - 选择题
        // 选择题特征：必须包含选项 A. B. C. D.
        if (is_string($stem)) {
            // 检查选项格式 A. B. C. D.（支持跨行匹配）
            // 更严格的正则：A. 后面跟内容，或者 (A) 后面跟内容
            if (preg_match('/[A-D]\s*\./', $stem) || preg_match('/\([A-D]\)/', $stem)) {
                // 再次确认是否包含多个选项，防止误判
                if (preg_match('/A\./', $stem) && preg_match('/B\./', $stem)) {
                    return 'choice';
                }
            }
            
            // 如果只有括号但没有选项，可能是填空题
            // 比如 "计算：(1) ... (2) ..." 这种是解答题
            // "若 x > 0，则 x + 1 (  )" 这种可能是填空也可能是选择，取决于是否有选项
            // 这里我们保守一点，如果没有选项特征，就不认为是选择题
        }

        // 4. 再次检查填空题特征（括号填空）
        if (is_string($stem)) {
            // 只有括号且没有选项，通常是填空
            if ((strpos($stem, '（）') !== false || strpos($stem, '()') !== false) && !preg_match('/[A-D]\./', $stem)) {
                return 'fill';
            }
        }

        // 5. 根据题干长度和内容判断（启发式）
        if (is_string($stem)) {
            // 有证明、解答、计算、求证等关键词的是解答题
            if (strpos($stem, '证明') !== false || strpos($stem, '求证') !== false || strpos($stem, '解方程') !== false || strpos($stem, '计算：') !== false) {
                return 'answer';
            }
        }

        // 默认是解答题
        return 'answer';
    }

    /**
     * 保留旧方法以兼容（但不再使用）
     */
    protected function autoGenerateQuestions(int $count)
    {
        // 调用新的批量生成方法
        $this->batchGenerateQuestions($count);
    }

    public function exportToPdf()
    {
        if (!$this->generatedPaperId) {
            Notification::make()
                ->title('错误')
                ->body('请先生成试卷')
                ->danger()
                ->send();
            return;
        }

        // 调用PDF导出API
        return redirect()->route('filament.admin.auth.intelligent-exam.pdf', [
            'paper_id' => $this->generatedPaperId
        ]);
    }

    public function resetForm()
    {
        $this->reset([
            'paperName', 'paperDescription', 'selectedKpCodes', 'selectedSkills',
            'selectedTeacherId', 'selectedStudentId', 'filterByStudentWeakness', 'generatedQuestions', 'generatedPaperId'
        ]);

        $this->questionTypeRatio = [
            '选择题' => 40,
            '填空题' => 30,
            '解答题' => 30,
        ];

        $this->difficultyRatio = [
            '基础' => 50,
            '中等' => 35,
            '拔高' => 15,
        ];
    }

    /**
     * 监听TeacherStudentSelector组件的老师变化事件
     */
    #[On('teacherChanged')]
    public function onTeacherChanged(string $teacherId): void
    {
        \Illuminate\Support\Facades\Log::info('智能出题页面收到教师变更事件', [
            'teacher_id' => $teacherId
        ]);

        $this->selectedTeacherId = $teacherId;
        // 清空学生选择和相关的筛选
        $this->selectedStudentId = null;
        $this->filterByStudentWeakness = false;
    }

    /**
     * 监听TeacherStudentSelector组件的学生变化事件
     */
    #[On('studentChanged')]
    public function onStudentChanged(string $teacherId, string $studentId): void
    {
        \Illuminate\Support\Facades\Log::info('智能出题页面收到学生变更事件', [
            'teacher_id' => $teacherId,
            'student_id' => $studentId
        ]);

        $this->selectedTeacherId = $teacherId;
        $this->selectedStudentId = $studentId;

        // ✅ 如果有学生选择，自动启用学生薄弱点筛选（但暂不勾选知识点）
        if ($studentId) {
            $this->filterByStudentWeakness = true;
            \Illuminate\Support\Facades\Log::info('已自动启用薄弱点筛选', [
                'student_id' => $studentId,
                'filter_enabled' => $this->filterByStudentWeakness
            ]);
            // 不立即触发，让用户自己选择
        } else {
            // 如果清空了学生选择，也清空薄弱点筛选
            $this->filterByStudentWeakness = false;
        }
    }
}