package com.mydreamjob.messaging;

import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Lock;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import jakarta.persistence.LockModeType;

import java.time.LocalDateTime;
import java.util.List;

@Repository
public interface MessageRepository extends JpaRepository<Message, Long> {

    Page<Message> findByConversationIdOrderByCreatedAtDesc(Long conversationId, Pageable pageable);

    List<Message> findByConversationIdInOrderByConversationIdAscCreatedAtDesc(List<Long> conversationIds);

    /**
     * 条件更新未命中后的当前读，用于区分并发请求已完成撤回与真实冲突。
     * PESSIMISTIC_WRITE 强制读取提交后的最新行，避免 MySQL REPEATABLE READ 使用旧快照。
     */
    @Lock(LockModeType.PESSIMISTIC_WRITE)
    @Query("select m from Message m where m.id = :messageId")
    java.util.Optional<Message> findCurrentByIdForRecall(@Param("messageId") Long messageId);

    @Modifying(clearAutomatically = true, flushAutomatically = true)
    @Query("""
            update Message m
               set m.status = 'RECALLED',
                   m.content = :placeholder,
                   m.recalledAt = :recalledAt,
                   m.version = m.version + 1
             where m.id = :messageId
               and m.conversationId = :conversationId
               and m.senderUserId = :senderUserId
               and m.status = 'SENT'
               and m.version = :expectedVersion
            """)
    int recallIfCurrent(@Param("messageId") Long messageId,
                        @Param("conversationId") Long conversationId,
                        @Param("senderUserId") Long senderUserId,
                        @Param("expectedVersion") Long expectedVersion,
                        @Param("placeholder") String placeholder,
                        @Param("recalledAt") LocalDateTime recalledAt);
}