package model

import (
	"time"

	"spark-server/internal/module/message/entity"
)

const (
	tablePrivateMessage = "private_message"
	tableGroupMessage   = "group_message"
)

// MessageRow is shared columns for private_message and group_message. Must be exported so GORM can embed it.
type MessageRow struct {
	ID             int64     `gorm:"column:id;primaryKey;autoIncrement:false;comment:Snowflake MsgId，主键、排序键、同步游标"`
	ConversationID int64     `gorm:"column:conversation_id;comment:所属会话 id"`
	SenderID       int64     `gorm:"column:sender_id;comment:发送者 user_id"`
	ClientMsgID    string    `gorm:"column:client_msg_id;comment:客户端消息 id，与 sender+会话 组成幂等键"`
	MessageType    int16     `gorm:"column:message_type;comment:消息类型：1文本 2图片 3语音 4视频 5表情 6GIF 7文件 8位置 9系统"`
	Content        []byte    `gorm:"column:content;type:blob;comment:序列化后的消息体（JSON 字节），禁止存原始 string；媒体只存对象存储 key"`
	Status         int       `gorm:"column:status;comment:1=正常 2=已撤回 3=审核隐藏"`
	CreatedAt      time.Time `gorm:"column:created_at;comment:服务端入库时间"`
}

func (r *MessageRow) entity(kind entity.Kind) *entity.Message {
	if r == nil {
		return nil
	}
	return &entity.Message{
		ID:             r.ID,
		ConversationID: r.ConversationID,
		SenderID:       r.SenderID,
		ClientMsgID:    r.ClientMsgID,
		Type:           entity.Type(r.MessageType),
		Kind:           kind,
		Content:        r.Content,
		Status:         entity.Status(r.Status),
		CreatedAtMS:    r.CreatedAt.UnixMilli(),
	}
}

func rowFrom(m *entity.Message) MessageRow {
	if m == nil {
		return MessageRow{}
	}
	return MessageRow{
		ID:             m.ID,
		ConversationID: m.ConversationID,
		SenderID:       m.SenderID,
		ClientMsgID:    m.ClientMsgID,
		MessageType:    int16(m.Type),
		Content:        m.Content,
		Status:         int(m.Status),
	}
}

func privateRow(m *entity.Message, base MessageRow) PrivateMessage {
	return PrivateMessage{MessageRow: base, ReceiverID: m.ReceiverID}
}

func groupRow(m *entity.Message, base MessageRow) GroupMessage {
	return GroupMessage{MessageRow: base, GroupID: m.GroupID}
}

func tableOf(kind entity.Kind) string {
	if kind == entity.KindGroup {
		return tableGroupMessage
	}
	return tablePrivateMessage
}