package users

import (
	"errors"
	"fmt"
	"strings"

	"github.com/google/uuid"
)

type User struct {
	Name string    `json:"name"`
	UUID uuid.UUID `json:"uuid"`
}

type VLESSUsers []User

func (u VLESSUsers) Del(user string) VLESSUsers {
	var newU VLESSUsers = make(VLESSUsers, 0, len(u))
	for _, v := range u {
		if v.Name != user {
			newU = append(newU, v)
		}
	}
	return newU
}

func (u VLESSUsers) checkInConfig(userName string) bool {
	for _, v := range u {
		if v.Name == userName {
			return true
		}
	}
	return false
}

func (u VLESSUsers) Add(userName string) (VLESSUsers, error) {

	if u.checkInConfig(userName) {
		return nil, errors.New("пользователь уже добавлен в конфиг")
	}

	newUUID, err := uuid.NewRandom()
	if err != nil {
		return nil, err
	}
	newUser := User{
		Name: userName,
		UUID: newUUID,
	}
	return append(u, newUser), nil
}

func (u VLESSUsers) List() string {
	var b strings.Builder
	for k, v := range u {
		fmt.Fprintf(&b, "%d.\t%s\t%s\n", k, v.Name, v.UUID.String())
	}
	return b.String()
}

func (u VLESSUsers) VlessURL(username string, domain string) string {
	var b strings.Builder
	for _, v := range u {
		if v.Name == username {
			fmt.Fprintf(&b, "vless://%s@%s:53666?security=&type=tcp&encryption=none#%s", v.UUID.String(), domain, v.Name)
			break
		}
	}
	return b.String()
}