package dao

import (
	"StuAcaWorksAI/proto"
	"encoding/json"
	"gorm.io/gorm"
	"log"
)

type Session struct {
	gorm.Model
	UserID  int             `gorm:"column:user_id"` //只能由用户创建
	Name    string          `gorm:"column:name"`
	Context json.RawMessage `gorm:"column:context;type:json"` //会话上下文
}

type Message struct {
	gorm.Model
	Type      int    `gorm:"column:type"`             //1用户之间的消息，2为与模型消息
	SessionID int    `gorm:"column:session_id;index"` //添加索引
	FromID    int    `gorm:"column:from_id"`          //发送者,可以为用户或者模型
	ToID      int    `gorm:"column:to_id"`            //接收者,可以为用户或者模型,如果为模型，则为模型id，根据type判断
	Msg       string `gorm:"column:msg"`              //消息内容
	Status    int    `gorm:"column:status"`           //0为未读，1为已读
}

func CreateSession(userID int, name string) (error, uint) {
	session := Session{UserID: userID, Name: name}
	var res *gorm.DB
	if proto.Config.SERVER_SQL_LOG {
		res = DB.Debug().Create(&session)
	} else {
		res = DB.Create(&session)
	}
	return res.Error, session.ID
}

func FindSessionByID(id int) Session {
	var session Session
	if proto.Config.SERVER_SQL_LOG {
		DB.Debug().Where("id = ?", id).First(&session)
	} else {
		DB.Where("id = ?", id).First(&session)
	}
	return session
}

// 获取用户最新的创建时间会话列表 50个
func FindSessionByUserID(userID int) []Session {
	var sessions []Session
	if proto.Config.SERVER_SQL_LOG {
		DB.Debug().Where("user_id = ?", userID).Order("created_at DESC").Limit(50).Find(&sessions)
	} else {
		DB.Where("user_id = ?", userID).Order("created_at DESC").Limit(50).Find(&sessions)
	}
	return sessions
}

// 更新会话的名字
func UpdateSessionByID(id int, userId int, name string, context []int) error {
	var res *gorm.DB
	contextJson, err := json.Marshal(context)
	if err != nil {
		log.Println("update session json marshal error:", err)
	}

	if proto.Config.SERVER_SQL_LOG {
		res = DB.Debug().Model(&Session{}).Where("id = ? AND user_id = ?", id, userId).Updates(Session{Name: name}).Update("context", contextJson)
	} else {
		res = DB.Model(&Session{}).Where("id = ? AND user_id = ?", id, userId).Updates(Session{Name: name, Context: nil}).Update("context", contextJson)
	}
	return res.Error
}

// 删除会话
func DeleteSessionByID(id int) error {
	var res *gorm.DB
	if proto.Config.SERVER_SQL_LOG {
		res = DB.Debug().Delete(&Session{}, id)
	} else {
		res = DB.Delete(&Session{}, id)
	}
	return res.Error
}

// 创建消息
func CreateMessage(sessionID, fromID, toID, msgType, status int, msg string) (error, uint) {
	message := Message{SessionID: sessionID, FromID: fromID, ToID: toID, Type: msgType, Status: status, Msg: msg}
	var res *gorm.DB
	if proto.Config.SERVER_SQL_LOG {
		res = DB.Debug().Create(&message)
	} else {
		res = DB.Create(&message)
	}
	return res.Error, message.ID
}

// 根据会话id获取消息
func FindMessageBySessionID(sessionID int) []Message {
	var messages []Message
	if proto.Config.SERVER_SQL_LOG {
		DB.Debug().Where("session_id = ?", sessionID).Order("created_at DESC").Find(&messages)
	} else {
		DB.Where("session_id = ?", sessionID).Order("created_at DESC").Find(&messages)
	}
	return messages
}

func FindMessageBySessionIDV2(sessionID int) []Message {
	var messages []Message
	if proto.Config.SERVER_SQL_LOG {
		DB.Debug().Where("session_id = ?", sessionID).Find(&messages)
	} else {
		DB.Where("session_id = ?", sessionID).Find(&messages)
	}
	return messages
}

type SessionMessageCount struct {
	SessionID int `gorm:"column:session_id"`
	Count     int `gorm:"column:count"`
}

// 获取属于用户的会话消息数量
func FindSessionMessageCountByUserID(userID int) []SessionMessageCount {
	var sessionMessageCounts []SessionMessageCount
	if proto.Config.SERVER_SQL_LOG {
		//DB.Debug().Exec("Select session_id, count(*) as count from messages where to_id = ? or from_id=? group by session_id", userID,userID).Scan(&sessionMessageCounts)
		DB.Debug().Table("messages").Select("session_id, count(*) as count").Where("to_id = ? or from_id= ?", userID, userID).Group("session_id").Scan(&sessionMessageCounts)
	} else {
		DB.Table("messages").Select("session_id, count(*) as count").Where("to_id = ? or from_id= ?", userID, userID).Group("session_id").Scan(&sessionMessageCounts)
	}
	return sessionMessageCounts
}