package com.designhub.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.designhub.entity.ContestParticipant;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import java.util.List;

/**
 * 竞赛参与者Mapper
 */
@Mapper
public interface ContestParticipantMapper extends BaseMapper<ContestParticipant> {

    /**
     * 获取竞赛排行榜
     */
    @Select("SELECT * FROM contest_participant WHERE contest_id = #{contestId} ORDER BY total_score DESC, task_completed DESC")
    List<ContestParticipant> getLeaderboard(@Param("contestId") Long contestId);

    /**
     * 获取用户在竞赛中的排名
     */
    @Select("SELECT COUNT(*) + 1 FROM contest_participant WHERE contest_id = #{contestId} AND total_score > (SELECT total_score FROM contest_participant WHERE contest_id = #{contestId} AND user_id = #{userId})")
    Integer getUserRank(@Param("contestId") Long contestId, @Param("userId") Long userId);
}