package auth

import (
	"net/http"
	"time"
)

type SessionStore struct {
	s        map[TokenID]*Token
	lastCull time.Time
}

type TokenID string

type Token struct {
	ID      TokenID
	Ctime   time.Time
	Expires time.Duration
	Addr    string
}

func (ss *SessionStore) init() {
	ss.s = make(map[TokenID]*Token)
}

const cullInterval = 5 * time.Minute

func (ss *SessionStore) cull() {
	if now := time.Now(); now.Sub(ss.lastCull) > cullInterval {
		for k, v := range ss.s {
			if now.After(v.Ctime.Add(v.Expires)) {
				delete(ss.s, k)
			}
		}
	}
}

func (ss *SessionStore) register(t *Token) {
	ss.cull()
	ss.s[t.ID] = t
}

func (a *Authenticator) NewToken(r *http.Request, f *Flow) TokenID {
	id := TokenID(genUUID())

	t := &Token{
		ID:    id,
		Ctime: time.Now(),
		Addr:  r.RemoteAddr,
	}

	a.Sessions.register(t)

	return id
}