package com.yunhai.agent.entity;

import lombok.Getter;
import lombok.Setter;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Index;
import javax.persistence.Lob;
import javax.persistence.Table;

/**
 * 会话里的一条消息（system / user / assistant / tool），按 seq_no 保序。
 *
 * <p>assistant 消息可能携带工具调用请求，序列化进 {@link #toolCalls}；
 * tool 消息用于回填工具执行结果，关联 {@link #toolCallId}。
 */
@Entity
@Table(name = "agent_message", indexes = {
        @Index(name = "idx_agent_msg_sid", columnList = "session_id,seq_no")
})
@Getter
@Setter
public class AgentMessage extends BaseEntity {

    /** 所属会话 id */
    @Column(name = "session_id", nullable = false, length = 64)
    private String sessionId;

    /** 会话内顺序（从 0 递增） */
    @Column(name = "seq_no")
    private Integer seqNo;

    /** 角色：system / user / assistant / tool */
    @Column(name = "role", length = 16)
    private String role;

    /** 正文（可能为空：assistant 只想调工具时） */
    @Lob
    @Column(name = "content", columnDefinition = "TEXT")
    private String content;

    /** assistant 的 tool_calls（JSON 数组字符串） */
    @Lob
    @Column(name = "tool_calls", columnDefinition = "TEXT")
    private String toolCalls;

    /** role=tool 时关联的调用 id */
    @Column(name = "tool_call_id", length = 64)
    private String toolCallId;
}