package model

import (
	"go.uber.org/zap"
	"goskeleton/app/global/variable"
	"goskeleton/app/service/users/token_cache_redis"
	"goskeleton/app/utils/md5_encrypt"
	"strconv"
	"time"
)

// 本文件针对 postgresql 数据库有效,请手动使用本文件的所有代码替换同目录的 users.go 中的所有代码即可
// 针对数据库选型为 postgresql 的开发者使用

// 操作数据库喜欢使用gorm自带语法的开发者可以参考 GinSkeleton-Admin 系统相关代码
// Admin 项目地址:https://gitee.com/daitougege/gin-skeleton-admin-backend/
// gorm_v2 提供的语法+ ginskeleton 实践 :  http://gitee.com/daitougege/gin-skeleton-admin-backend/blob/master/app/model/button_cn_en.go

// 创建 userFactory
// 参数说明: 传递空值,默认使用 配置文件选项:UseDbType(mysql)
func CreateUserFactory(sqlType string) *UsersModel {
	return &UsersModel{BaseModel: BaseModel{DB: UseDbConn(sqlType)}}
}

type UsersModel struct {
	BaseModel
	UserName    string `gorm:"column:user_name" json:"user_name"`
	Pass        string `json:"-"`
	Phone       string `json:"phone"`
	RealName    string `gorm:"column:real_name" json:"real_name"`
	Status      int    `json:"status"`
	Token       string `json:"token"`
	LastLoginIp string `gorm:"column:last_login_ip" json:"last_login_ip"`
}

// TableName 表名
func (u *UsersModel) TableName() string {
	return "web.tb_users"
}

// Register 用户注册(写一个最简单的使用账号、密码注册即可)
func (u *UsersModel) Register(userName, pass, userIp string) bool {
	sql := "INSERT  INTO web.tb_users(user_name,pass,last_login_ip) SELECT ?,?,?    WHERE NOT EXISTS (SELECT 1  FROM web.tb_users WHERE  user_name=?)"
	result := u.Exec(sql, userName, pass, userIp, userName)
	if result.RowsAffected > 0 {
		return true
	} else {
		return false
	}
}

// Login 用户登录,
func (u *UsersModel) Login(userName string, pass string) *UsersModel {
	sql := "select id, user_name,real_name,pass,phone  from web.tb_users where  user_name=? limit 1"
	result := u.Raw(sql, userName).First(u)
	if result.Error == nil {
		// 账号密码验证成功
		if len(u.Pass) > 0 && (u.Pass == md5_encrypt.Base64Md5(pass)) {
			return u
		}
	} else {
		variable.ZapLog.Error("根据账号查询单条记录出错:", zap.Error(result.Error))
	}
	return nil
}

// OauthLoginToken 记录用户登陆(login)生成的token,每次登陆记录一次token
func (u *UsersModel) OauthLoginToken(userId int64, token string, expiresAt int64, clientIp string) bool {
	sql := `INSERT   INTO  web.tb_oauth_access_tokens(fr_user_id,action_name,token,expires_at,client_ip)
		SELECT  ?,'login',? ,?,?    WHERE   NOT   EXISTS(SELECT  1  FROM  web.tb_oauth_access_tokens a WHERE  a.fr_user_id=?  AND a.action_name='login' AND a.token=?)
		`
	//注意:token的精确度为秒,如果在一秒之内,一个账号多次调用接口生成的token其实是相同的,这样写入数据库,第二次的影响行数为0,知己实际上操作仍然是有效的。
	//所以这里只判断无错误即可,判断影响行数的话,>=0 都是ok的
	if u.Exec(sql, userId, token, time.Unix(expiresAt, 0).Format(variable.DateFormat), clientIp, userId, token).Error == nil {
		// 异步缓存用户有效的token到redis
    	if variable.ConfigYml.GetInt("Token.IsCacheToRedis") == 1 {
    		go u.ValidTokenCacheToRedis(userId)
    	}
		return true
	}
	return false
}

// OauthRefreshConditionCheck 用户刷新token,条件检查: 相关token在过期的时间之内,就符合刷新条件
func (u *UsersModel) OauthRefreshConditionCheck(userId int64, oldToken string) bool {
	// 首先判断旧token在本系统自带的数据库已经存在,才允许继续执行刷新逻辑
	var oldTokenIsExists int
	sql := "SELECT count(*)  as  counts FROM  web.tb_oauth_access_tokens  WHERE fr_user_id =? and token=? and NOW() < (expires_at + cast(? as interval)) "
	refreshSec := variable.ConfigYml.GetInt64("Token.JwtTokenRefreshAllowSec")
	if u.Raw(sql, userId, oldToken, strconv.FormatInt(refreshSec, 10)+" second").First(&oldTokenIsExists).Error == nil && oldTokenIsExists == 1 {
		return true
	}
	return false
}

// OauthRefreshToken 用户刷新token
func (u *UsersModel) OauthRefreshToken(userId, expiresAt int64, oldToken, newToken, clientIp string) bool {
	sql := "UPDATE   web.tb_oauth_access_tokens   SET  token=? ,expires_at=?,client_ip=?,updated_at= now() ,action_name='refresh'  WHERE   fr_user_id=? AND token=?"
	if u.Exec(sql, newToken, time.Unix(expiresAt, 0).Format(variable.DateFormat), clientIp, userId, oldToken).Error == nil {
			// 异步缓存用户有效的token到redis
    		if variable.ConfigYml.GetInt("Token.IsCacheToRedis") == 1 {
    			go u.ValidTokenCacheToRedis(userId)
    		}
		go u.UpdateUserloginInfo(clientIp, userId)
		return true
	}
	return false
}

// UpdateUserloginInfo 更新用户登陆次数、最近一次登录ip、最近一次登录时间
func (u *UsersModel) UpdateUserloginInfo(last_login_ip string, userId int64) {
	sql := "UPDATE  web.tb_users   SET  login_times=COALESCE(login_times,0)+1,last_login_ip=?,last_login_time=?  WHERE   id=?  "
	_ = u.Exec(sql, last_login_ip, time.Now().Format(variable.DateFormat), userId)
}

// OauthResetToken 当用户更改密码后,所有的token都失效,必须重新登录
func (u *UsersModel) OauthResetToken(userId int, newPass, clientIp string) bool {
	//如果用户新旧密码一致,直接返回true,不需要处理
	userItem, err := u.ShowOneItem(userId)
	if userItem != nil && err == nil && userItem.Pass == newPass {
		return true
	} else if userItem != nil {

		// 如果用户密码被修改,那么redis中的token值也清除
		if variable.ConfigYml.GetInt("Token.IsCacheToRedis") == 1 {
			go u.DelTokenCacheFromRedis(int64(userId))
		}

		sql := "UPDATE  web.tb_oauth_access_tokens  SET  revoked=1,updated_at= now() ,action_name='ResetPass',client_ip=?  WHERE  fr_user_id=?  "
		if u.Exec(sql, clientIp, userId).Error == nil {
			return true
		}
	}
	return false
}

//OauthDestroyToken 当tb_users 删除数据,相关的token同步删除
func (u *UsersModel) OauthDestroyToken(userId int) bool {
	//如果用户新旧密码一致,直接返回true,不需要处理
	sql := "DELETE FROM  web.tb_oauth_access_tokens WHERE  fr_user_id=?  "
	//判断>=0, 有些没有登录过的用户没有相关token,此语句执行影响行数为0,但是仍然是执行成功
	if u.Exec(sql, userId).Error == nil {
		return true
	}
	return false
}

// OauthCheckTokenIsOk 判断用户token是否在数据库存在+状态OK
func (u *UsersModel) OauthCheckTokenIsOk(userId int64, token string) bool {
	sql := `
		SELECT  token  FROM  web.tb_oauth_access_tokens
		WHERE   fr_user_id=?  AND  revoked=0  AND  expires_at> now()
		ORDER  BY   expires_at  DESC , updated_at  DESC limit ?
	`
	maxOnlineUsers := variable.ConfigYml.GetInt("Token.JwtTokenOnlineUsers")
	rows, err := u.Raw(sql, userId, maxOnlineUsers).Rows()
    defer func() {
        //  凡是查询类记得释放记录集
        _ = rows.Close()
    }()
	if err == nil && rows != nil {
		for rows.Next() {
			var tempToken string
			err := rows.Scan(&tempToken)
			if err == nil {
				if tempToken == token {
					_ = rows.Close()
					return true
				}
			}
		}
	}
	return false
}

// 禁用一个用户的: 1.tb_users表的 status 设置为 0,web.tb_oauth_access_tokens 表的所有token删除
// 禁用一个用户的token请求(本质上就是把tb_users表的 status 字段设置为 0 即可)
func (u *UsersModel) SetTokenInvalid(userId int) bool {
	sql := "delete from  web.tb_oauth_access_tokens  where  fr_user_id=?  "
	if u.Exec(sql, userId).Error == nil {
		if u.Exec("update  web.tb_users  set  status=0 where   id=?", userId).Error == nil {
			return true
		}
	}
	return false
}

//根据用户ID查询一条信息
func (u *UsersModel) ShowOneItem(userId int) (*UsersModel, error) {
	sql := "SELECT id, user_name,pass, real_name, phone, status,TO_CHAR(created_at,'yyyy-mm-dd hh24:mi:ss') as created_at, TO_CHAR(updated_at,'yyyy-mm-dd hh24:mi:ss') as updated_at FROM  web.tb_users  WHERE status=1 and   id=? limit 1"
	result := u.Raw(sql, userId).First(u)
	if result.Error == nil {
		return u, nil
	} else {
		return nil, result.Error
	}
}

// counts 查询数据之前统计条数
func (u *UsersModel) counts(userName string) (counts int64) {
	sql := "SELECT  count(*) as counts  FROM  web.tb_users  WHERE status=1 and   user_name like ?"
	if res := u.Raw(sql, "%"+userName+"%").First(&counts); res.Error != nil {
		variable.ZapLog.Error("UsersModel - counts 查询数据条数出错", zap.Error(res.Error))
	}
	return counts
}

// Show 查询(根据关键词模糊查询)
func (u *UsersModel) Show(userName string, limitStart, limitItems int) (counts int64, temp []UsersModel) {
	if counts = u.counts(userName); counts > 0 {
		sql := `
		SELECT  id, user_name, real_name, phone, status, last_login_ip,phone,
		TO_CHAR(created_at,'yyyy-mm-dd hh24:mi:ss') as created_at, TO_CHAR(updated_at,'yyyy-mm-dd hh24:mi:ss') as updated_at
		FROM  web.tb_users  WHERE status=1 and   user_name like ? limit ? offset ?
		`
		if res := u.Raw(sql, "%"+userName+"%", limitItems, limitStart).Find(&temp); res.RowsAffected > 0 {
			return counts, temp
		}
	}
	return 0, nil
}

// Store 新增
func (u *UsersModel) Store(userName string, pass string, realName string, phone string, remark string) bool {
	sql := "INSERT  INTO web.tb_users(user_name,pass,real_name,phone,remark) SELECT ?,?,?,?,?   WHERE NOT EXISTS (SELECT 1  FROM web.tb_users WHERE  user_name=?)"
	if u.Exec(sql, userName, pass, realName, phone, remark, userName).RowsAffected > 0 {
		return true
	}
	return false
}

// UpdateDataCheckUserNameIsUsed 更新前检查新的用户名是否已经存在(避免和别的账号重名)
func (u *UsersModel) UpdateDataCheckUserNameIsUsed(userId int, userName string) (exists int64) {
	sql := "select count(*) as counts from web.tb_users where  id!=?  AND user_name=?"
	_ = u.Raw(sql, userId, userName).First(&exists)
	return exists
}

// Update 更新
func (u *UsersModel) Update(id int, userName string, pass string, realName string, phone string, remark string, clientIp string) bool {
	sql := "update web.tb_users set user_name=?,pass=?,real_name=?,phone=?,remark=?  WHERE status=1 AND id=?"
	if u.Exec(sql, userName, pass, realName, phone, remark, id).RowsAffected >= 0 {
		if u.OauthResetToken(id, pass, clientIp) {
			return true
		}
	}
	return false
}

// Destroy 删除用户以及关联的token记录
func (u *UsersModel) Destroy(id int) bool {
	// 删除用户时,清除用户缓存在redis的全部token
	if variable.ConfigYml.GetInt("Token.IsCacheToRedis") == 1 {
		go u.DelTokenCacheFromRedis(int64(id))
	}
	if u.Delete(u, id).Error == nil {
		if u.OauthDestroyToken(id) {
			return true
		}
	}
	return false
}

// 后续两个函数专门处理用户 token 缓存到 redis 逻辑

func (u *UsersModel) ValidTokenCacheToRedis(userId int64) {
	tokenCacheRedisFact := token_cache_redis.CreateUsersTokenCacheFactory(userId)
	if tokenCacheRedisFact == nil {
		variable.ZapLog.Error("redis连接失败,请检查配置")
		return
	}
	defer tokenCacheRedisFact.ReleaseRedisConn()

	sql := "SELECT   token,to_char(expires_at,'yyyy-mm-dd hh24:mi:ss') as expires_at  FROM  web.tb_oauth_access_tokens  WHERE   fr_user_id=?  AND  revoked=0  AND  expires_at>NOW() ORDER  BY  expires_at  DESC , updated_at  DESC  LIMIT ?"
	maxOnlineUsers := variable.ConfigYml.GetInt("Token.JwtTokenOnlineUsers")
	rows, err := u.Raw(sql, userId, maxOnlineUsers).Rows()
	defer func() {
		//  凡是获取原生结果集的查询,记得释放记录集
		_ = rows.Close()
	}()

	var tempToken, expires string
	if err == nil && rows != nil {
		for i := 1; rows.Next(); i++ {
			err = rows.Scan(&tempToken, &expires)
			if err == nil {
				if ts, err := time.ParseInLocation(variable.DateFormat, expires, time.Local); err == nil {
					tokenCacheRedisFact.SetTokenCache(ts.Unix(), tempToken)
					// 因为每个用户的token是按照过期时间倒叙排列的,第一个是有效期最长的,将该用户的总键设置一个最大过期时间,到期则自动清理,避免不必要的数据残留
					if i == 1 {
						tokenCacheRedisFact.SetUserTokenExpire(ts.Unix())
					}
				} else {
					variable.ZapLog.Error("expires_at 转换位时间戳出错", zap.Error(err))
				}
			}
		}
	}
	// 缓存结束之后删除超过系统设置最大在线数量的token
	tokenCacheRedisFact.DelOverMaxOnlineCache()
}

// DelTokenCacheFromRedis 用户密码修改后,删除redis所有的token
func (u *UsersModel) DelTokenCacheFromRedis(userId int64) {
	tokenCacheRedisFact := token_cache_redis.CreateUsersTokenCacheFactory(userId)
	if tokenCacheRedisFact == nil {
		variable.ZapLog.Error("redis连接失败,请检查配置")
		return
	}
	tokenCacheRedisFact.ClearUserToken()
	tokenCacheRedisFact.ReleaseRedisConn()
}