<?php
namespace App\Services\Exam;

use App\Models\ExamPaperModel;
use App\Models\ExamTopicModel;
use App\Services\BaseService;
use Illuminate\Support\Facades\DB;

/**
 * 试卷管理-服务类
 * Class PaperService
 */
class PaperService extends BaseService
{
    protected static $instance = null;
    protected $model = null;

    public function __construct()
    {
        $this->model = new ExamPaperModel();
    }

    public static function make()
    {
        if (!self::$instance) {
            self::$instance = new PaperService();
        }
        return self::$instance;
    }

    public function customList($params, $pageSize = 15)
    {
        $query = $this->model->where('mark', operator: 1);

        if (!empty($params['scene_type'])) {
            $query->where('scene_type', $params['scene_type']);
        }
        if (!empty($params['type'])) {
            $query->where('type', $params['type']);
        }

        if (!empty($params['subject_id'])) {
            $query->where('subject_id', $params['subject_id']);
        }
        if (!empty($params['is_charge'])) {
            $query->where('is_charge', $params['is_charge']);
        }

        if (!empty($params['keyword'])) {
            $query->where(function ($q) use ($params) {
                $q->where('id', $params['keyword'])
                    ->orWhere('name', 'like', "%{$params['keyword']}%");
            });
        }

        $list = $query->orderBy('sort', 'desc')->paginate($pageSize > 0 ? $pageSize : 9999999);
        $list = $list ? $list->toArray() : [];
        return [
            'pageSize' => $pageSize,
            'total' => isset($list['total']) ? $list['total'] : 0,
            'list' => isset($list['data']) ? $list['data'] : []
        ];
        return message("操作成功", true, $list);
    }

    public function createPaperWithTopics(array $formData, array $topicsData)
    {
        if (empty($formData) || empty($topicsData)) {
            return ['code' => 1, 'msg' => '表单数据或题目数据不能为空'];
        }

        DB::beginTransaction();
        try {
            $paperData = array_merge($formData, [
                'mark' => 1,
                'create_time' => time(),
                'score_total' => 0,
                'topic_count' => 0,
            ]);
            // 创建试卷
            $paperId = $this->model->edit($paperData);

            // 重新加载完整字段
            $paper = $this->model->find($paperId);
            $totalScore = 0;
            $topicCount = 0;

            foreach ($topicsData as $index => &$topic) {
                $score = intval($topic['score'] ?? 0);
                $totalScore += $score;
                $topicCount++;

                $topic = array_merge($topic, [
                    'paper_id' => $paper->id,
                    'sort' => count($topicsData) - $index,
                    'status' => 1,
                    'mark' => 1,
                    'create_time' => time(),
                ]);
                unset($topic['_id']);
            }

            // 批量插入题目
            ExamTopicModel::insert($topicsData);

            // 更新试卷总分和题目数量
            $paper->score_total = $totalScore;
            $paper->topic_count = $topicCount;
            $paper->save();

            DB::commit();
            return ['code' => 0, 'msg' => '创建试卷成功', 'data' => $paper];
        } catch (\Exception $e) {
            DB::rollBack();
            return ['code' => 1, 'msg' => '创建失败：' . $e->getMessage()];
        }
    }

}