package game

import (
	"crypto/ed25519"
	"encoding/base64"

	petname "github.com/dustinkirkland/golang-petname"
)

var lastSessionId int = 0
var sessionStorage []Session = []Session{}
var nameToSession map[string]*Session = make(map[string]*Session)

type Session struct {
	id    int
	Name  string
	Users []User
}

func NewSession() Session {
	sessionName := petname.Generate(3, "-")

	s := Session{
		id:    lastSessionId,
		Name:  sessionName,
		Users: []User{},
	}

	sessionStorage = append(sessionStorage, s)
	nameToSession[sessionName] = &s
	lastSessionId++

	return s
}

func GetSession(name string) *Session {
	return nameToSession[name]
}

func (s *Session) AddUser(user User) {
	s.Users = append(s.Users, user)
}

func (s Session) VerifySignature(signature string, message []byte) *User {
	for _, u := range s.Users {
		sig, _ := base64.StdEncoding.DecodeString(signature)

		if ed25519.Verify(u.PublicKey, message, sig) {
			return &u
		}
	}

	return nil
}