package model

import (
	"errors"
	_ "gorm.io/driver/sqlite"
	"one-api/common"
	"strings"
)

type Token struct {
	Id           int    `json:"id"`
	UserId       int    `json:"user_id"`
	Key          string `json:"key" gorm:"uniqueIndex"`
	Status       int    `json:"status" gorm:"default:1"`
	Name         string `json:"name" gorm:"index" `
	CreatedTime  int64  `json:"created_time" gorm:"bigint"`
	AccessedTime int64  `json:"accessed_time" gorm:"bigint"`
	ExpiredTime  int64  `json:"expired_time" gorm:"bigint;default:-1"` // -1 means never expired
	RemainTimes  int    `json:"remain_times" gorm:"default:-1"`        // -1 means infinite times
}

func GetAllUserTokens(userId int, startIdx int, num int) ([]*Token, error) {
	var tokens []*Token
	var err error
	err = DB.Where("user_id = ?", userId).Order("id desc").Limit(num).Offset(startIdx).Find(&tokens).Error
	return tokens, err
}

func SearchUserTokens(userId int, keyword string) (tokens []*Token, err error) {
	err = DB.Where("user_id = ?", userId).Where("id = ? or name LIKE ?", keyword, keyword+"%").Find(&tokens).Error
	return tokens, err
}

func ValidateUserToken(key string) (token *Token, err error) {
	if key == "" {
		return nil, errors.New("未提供 token")
	}
	key = strings.Replace(key, "Bearer ", "", 1)
	token = &Token{}
	err = DB.Where("key = ?", key).First(token).Error
	if err == nil {
		if token.Status != common.TokenStatusEnabled {
			return nil, errors.New("该 token 状态不可用")
		}
		if token.ExpiredTime != -1 && token.ExpiredTime < common.GetTimestamp() {
			token.Status = common.TokenStatusExpired
			err := token.SelectUpdate()
			if err != nil {
				common.SysError("更新 token 状态失败：" + err.Error())
			}
			return nil, errors.New("该 token 已过期")
		}
		go func() {
			token.AccessedTime = common.GetTimestamp()
			if token.RemainTimes > 0 {
				token.RemainTimes--
				if token.RemainTimes == 0 {
					token.Status = common.TokenStatusExhausted
				}
			}
			err := token.SelectUpdate()
			if err != nil {
				common.SysError("更新 token 失败：" + err.Error())
			}
		}()
		return token, nil
	}
	return nil, errors.New("无效的 token")
}

func GetTokenByIds(id int, userId int) (*Token, error) {
	if id == 0 || userId == 0 {
		return nil, errors.New("id 或 userId 为空！")
	}
	token := Token{Id: id, UserId: userId}
	var err error = nil
	err = DB.First(&token, "id = ? and user_id = ?", id, userId).Error
	return &token, err
}

func (token *Token) Insert() error {
	var err error
	err = DB.Create(token).Error
	return err
}

func (token *Token) Update() error {
	var err error
	err = DB.Model(token).Updates(token).Error
	return err
}

func (token *Token) SelectUpdate() error {
	// This can update zero values
	return DB.Model(token).Select("accessed_time", "remain_times", "status").Updates(token).Error
}

func (token *Token) Delete() error {
	var err error
	err = DB.Delete(token).Error
	return err
}

func DeleteTokenById(id int, userId int) (err error) {
	// Why we need userId here? In case user want to delete other's token.
	if id == 0 || userId == 0 {
		return errors.New("id 或 userId 为空！")
	}
	token := Token{Id: id, UserId: userId}
	err = DB.Where(token).First(&token).Error
	if err != nil {
		return err
	}
	return token.Delete()
}