<?php

namespace App\Services\Exam;

use App\Models\ExamPaperModel;
use App\Models\ExamTopicModel;
use App\Models\ActionLogModel;
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',  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 = $query->orderBy('sort', 'desc')->orderBy('id', 'desc')->paginate($pageSize > 0 ? $pageSize : 9999999);
        $list = $list ? $list->toArray() : [];
        return [
            'pageSize' => $pageSize,
            'total' => isset($list['total']) ? $list['total'] : 0,
            'list' => isset($list['data']) ? $list['data'] : []
        ];
    }

    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) {
                $score = floatval($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（保留两位小数）
            $paper->score_total = round($totalScore, 2);
            $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()];
        }
    }

    /**
     * 获取记录详情
     * @return array
     * @since 2020/11/11
     * @author laravel开发员
     */
    public function info()
    {
        // 记录ID
        $id = request()->input("id", 0);
        $info = [];
        if ($id) {
            $info = $this->model->getInfo($id);

            // 如果试题数量或总分为空，从数据库重新获取
            if ($info && (empty($info['topic_count']) || empty($info['score_total']))) {
                // 获取该试卷下所有有效题目的统计信息
                $topicModel = new ExamTopicModel();
                $statistics = $topicModel
                    ->where('paper_id', $id)
                    ->where('mark', 1)
                    ->selectRaw('COUNT(*) as topic_count, SUM(score) as score_total')
                    ->first();

                if ($statistics) {
                    // 如果试题数量为空，使用数据库中的值
                    if (empty($info['topic_count'])) {
                        $info['topic_count'] = intval($statistics->topic_count ?? 0);
                    }
                    // 如果总分为空，使用数据库中的值
                    if (empty($info['score_total'])) {
                        $info['score_total'] = floatval($statistics->score_total ?? 0);
                    }
                }
            }
        }
        return message(MESSAGE_OK, true, $info);
    }

    /**
     * 添加或编辑记录
     * @return array
     * @since 2020/11/11
     * @author laravel开发员
     */
    public function edit()
    {
        // 获取参数
        $argList = func_get_args();
        // 查询条件
        $data = isset($argList[0]) ? $argList[0] : [];
        // 是否打印SQL
        $is_sql = isset($argList[1]) ? $argList[1] : false;
        if (!$data) {
            $data = request()->all();
        }

        // 获取试卷ID
        $paperId = isset($data['id']) ? intval($data['id']) : 0;

        // 如果试题数量或总分为空，从数据库重新获取
        // 检查字段是否为 null、未设置、空字符串或0（如果为空，从数据库重新计算）
        $topicCountEmpty = !isset($data['topic_count']) || $data['topic_count'] === null || $data['topic_count'] === '' || $data['topic_count'] === 0;
        $scoreTotalEmpty = !isset($data['score_total']) || $data['score_total'] === null || $data['score_total'] === '' || $data['score_total'] === 0;

        if ($paperId > 0 && ($topicCountEmpty || $scoreTotalEmpty)) {
            // 获取该试卷下所有有效题目的统计信息
            $topicModel = new ExamTopicModel();
            $statistics = $topicModel
                ->where('paper_id', $paperId)
                ->where('mark', 1)
                ->selectRaw('COUNT(*) as topic_count, SUM(score) as score_total')
                ->first();

            if ($statistics) {
                // 如果试题数量为空，使用数据库中的值
                if ($topicCountEmpty) {
                    $data['topic_count'] = intval($statistics->topic_count ?? 0);
                }
                // 如果总分为空，使用数据库中的值
                if ($scoreTotalEmpty) {
                    $data['score_total'] = floatval($statistics->score_total ?? 0);
                }
            }
        }

        // 调用父类的 edit 方法
        $error = '';
        $rowId = $this->model->edit($data, $error, $is_sql);
        if ($rowId) {
            return message(MESSAGE_OK, true, ['id' => $rowId]);
        }
        return message($error, false);
    }

    /**
     * 删除七天之前标记软删除的数据
     */
    public function delete()
    {
        // 设置日志标题
        ActionLogModel::setRecord(session('userId'), ['type' => 1, 'title' => "删除试卷信息", 'content' => json_encode(request()->post(), 256), 'module' => 'admin']);
        ActionLogModel::record();

        // 获取要删除的试卷ID
        $ids = request()->post('id', []);
        if (!is_array($ids)) {
            $ids = [$ids];
        }

        // 删除该试卷下关联的所有试题
        if (!empty($ids)) {
            $topicModel = new ExamTopicModel();
            // 查询该试卷下的所有试题
            $topicIds = $topicModel->whereIn('paper_id', $ids)
                ->where('mark', 1)
                ->pluck('id')
                ->toArray();

            if (!empty($topicIds)) {
                // 软删除试题（标记mark=0）
                $topicModel->whereIn('id', $topicIds)->update([
                    'mark' => 0,
                    'update_time' => time()
                ]);
            }
        }

        // 清理七天前标记软删除的数据
        $this->model->where('mark', 0)->where('update_time', '<=', time() - 7 * 86400)->delete();
        $topicModel = new ExamTopicModel();
        $topicModel->where('mark', 0)->where('update_time', '<=', time() - 7 * 86400)->delete();

        return parent::delete();
    }
}