package com.mydreamjob.application;

import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import java.util.Optional;
import java.util.List;

@Repository
public interface ApplicationRepository extends JpaRepository<Application, Long> {

    Optional<Application> findByJobIdAndStudentUserId(Long jobId, Long studentUserId);

    List<Application> findByStudentUserIdOrderByCreatedAtDesc(Long studentUserId);

    Page<Application> findByStudentUserIdOrderByCreatedAtDesc(Long studentUserId, Pageable pageable);

    Page<Application> findByStudentUserIdAndStatusOrderByCreatedAtDesc(Long studentUserId, String status, Pageable pageable);

    List<Application> findByJobIdOrderByCreatedAtDesc(Long jobId);

    Page<Application> findByJobIdOrderByCreatedAtDesc(Long jobId, Pageable pageable);

    Page<Application> findByJobIdAndStatusOrderByCreatedAtDesc(Long jobId, String status, Pageable pageable);

    boolean existsByJobIdAndStudentUserId(Long jobId, Long studentUserId);

    @org.springframework.data.jpa.repository.Query("select distinct a.jobId from Application a where a.studentUserId = :studentUserId")
    java.util.List<Long> findDistinctJobIdsByStudentUserId(@org.springframework.data.repository.query.Param("studentUserId") Long studentUserId);

    /**
     * 同岗位竞争排名：判断学生是否存在某岗位的「有效投递」（状态不在排除集合内，
     * 即非 WITHDRAWN/REJECTED）。与 {@link #findByJobIdAndStatusNotInOrderByCreatedAtAsc}
     * 共用同一排除口径，避免"曾投递但已失效"误放行导致返回 200。
     */
    boolean existsByJobIdAndStudentUserIdAndStatusNotIn(Long jobId, Long studentUserId,
                                                        java.util.Collection<String> statuses);

    /**
     * 同岗位 rank 用：取某岗位未排除（非 WITHDRAWN/REJECTED）的投递，按投递时间正序。
     */
    List<Application> findByJobIdAndStatusNotInOrderByCreatedAtAsc(Long jobId, java.util.Collection<String> statuses);

    /**
     * V34 批量：一次取出多个岗位（page 内投递涉及的去重 jobId）未排除的候选人投递，
     * 按投递时间正序；用于批量计算同岗位竞争力排名，避免按岗位循环查询造成 N+1。
     */
    List<Application> findByJobIdInAndStatusNotInOrderByCreatedAtAsc(java.util.Collection<Long> jobIds,
                                                                     java.util.Collection<String> statuses);
}