package dao

import (
	"gorm.io/gorm"
	"videoplayer/proto"
)

type Message struct {
	gorm.Model
	FromUserID int    `gorm:"column:from_user_id"`
	ToUserID   int    `gorm:"column:to_user_id"`
	GroupID    int    `gorm:"column:group_id"`
	Msg        string `gorm:"column:msg"`
	Status     int    `gorm:"column:status"` //单聊时才有0,已读，2未读
	Type       int    `gorm:"column:type"`   //1为单聊，2为群聊，3为系统消息
}

type Group struct {
	gorm.Model
	GroupName string `gorm:"column:group_name"`
	GroupInfo string `gorm:"column:group_info"`
	GroupType int    `gorm:"column:group_type"`
	GroupIcon string `gorm:"column:group_icon"`
}

type GroupUser struct {
	gorm.Model
	GroupID  int  `gorm:"column:group_id"`
	UserID   int  `gorm:"column:user_id"`
	IsMaster bool `gorm:"column:is_master"`
}

type Friend struct {
	gorm.Model
	UserID   int `gorm:"column:user_id"`
	FriendID int `gorm:"column:friend_id"`
}

// 创建单聊消息
func CreateSimpleMessage(from_user_id, to_user_id int, message string) error {
	msg := Message{FromUserID: from_user_id, ToUserID: to_user_id, Msg: message, Type: proto.MSG_TYPE_SIMPLE, Status: proto.MSG_STATUS_UNREAD}
	res := DB.Debug().Create(msg)
	return res.Error
}

func CreateGeneralMessage(from_user_id, to_user_id, msg_type, status int, message string) error {
	msg := Message{FromUserID: from_user_id, ToUserID: to_user_id, Msg: message, Type: msg_type, Status: status}
	res := DB.Debug().Create(msg)
	return res.Error
}

// 每20个消息一组，请求index*20
func GetMsgUserByIndex(from_user_id, to_user_id, index int) ([]Message, error) {
	var msgs []Message
	res := DB.Debug().Where("from_user_id = ? and to_user_id = ?", from_user_id, to_user_id).Find(&msgs).Order("order by createAt DESC").Limit(20 * index)
	return msgs, res.Error
}

// 修改信息
func UpdateMessage() {

}

// 添加好友
func AddFriend(user_id, friend_id int) error {
	friend := Friend{UserID: user_id, FriendID: friend_id}
	friend2 := Friend{UserID: friend_id, FriendID: user_id}

	//开启事务
	tx := DB.Begin()
	if err := tx.Create(&friend); err.Error != nil {
		tx.Rollback()
		return err.Error
	}
	if err := tx.Create(&friend2); err.Error != nil {
		tx.Rollback()
		return err.Error
	}
	//提交事务
	if err := tx.Commit().Error; err != nil {
		return err
	}
	return error(nil)
}

// 删除好友,删除后双方都不是好友
func DeleteFriend(user_id, friend_id int) error {
	//开启事务
	tx := DB.Begin()
	if err := tx.Delete(&Friend{}, "user_id = ? and friend_id = ?", user_id, friend_id); err.Error != nil {
		tx.Rollback()
		return err.Error
	}
	if err := tx.Delete(&Friend{}, "user_id = ? and friend_id = ?", friend_id, user_id); err.Error != nil {
		tx.Rollback()
		return err.Error
	}
	//提交事务
	if err := tx.Commit().Error; err != nil {
		return err
	}
	return error(nil)
}

// 通过id查找消息
func FindMessageByID(id uint) []Message {
	var msgs []Message
	DB.Debug().Where("id = ?", id).Find(msgs)
	return msgs
}

// 更新消息状态
func UpdateMessageStatus(id uint, status int) error {
	res := DB.Debug().Model(&Message{}).Where("id = ?", id).Update("status", status)
	return res.Error
}

// 创建群聊,需要事务
func CreateGroup(group_name string, master_user_id int) uint {
	group := Group{GroupName: group_name}
	//开启事务
	tx := DB.Begin()
	if err := tx.Create(&group); err.Error != nil {
		tx.Rollback()
		return 0
	}
	groupUser := GroupUser{GroupID: int(group.ID), UserID: master_user_id, IsMaster: true}
	if err := tx.Create(&groupUser); err.Error != nil {
		tx.Rollback()
		return 0
	}
	//提交事务
	if err := tx.Commit().Error; err != nil {
		return 0
	}
	return group.ID
}

// 加入群聊
func JoinGroup(group_id, user_id int) error {
	groupUser := GroupUser{GroupID: group_id, UserID: user_id}
	res := DB.Debug().Create(&groupUser)
	return res.Error
}

// 退出群聊
func QuitGroup(group_id, user_id int) error {
	res := DB.Debug().Delete(&GroupUser{}, "group_id = ? and user_id = ?", group_id, user_id)
	return res.Error
}