package authboss

import (
	"net/http"
	"time"
)

var nowTime = time.Now

// TimeToExpiry returns zero if the user session is expired else the time until expiry.
func (a *Authboss) TimeToExpiry(w http.ResponseWriter, r *http.Request) time.Duration {
	//TODO(aarondl): Rewrite this so it makes sense with new ClientStorer idioms
	//return a.timeToExpiry(state.(ClientState))
	return 0
}

func (a *Authboss) timeToExpiry(session ClientState) time.Duration {
	dateStr, ok := session.Get(SessionLastAction)
	if !ok {
		return a.ExpireAfter
	}

	date, err := time.Parse(time.RFC3339, dateStr)
	if err != nil {
		panic("last_action is not a valid RFC3339 date")
	}

	remaining := date.Add(a.ExpireAfter).Sub(nowTime().UTC())
	if remaining > 0 {
		return remaining
	}

	return 0
}

// RefreshExpiry  updates the last action for the user, so he doesn't become expired.
func (a *Authboss) RefreshExpiry(w http.ResponseWriter, r *http.Request) {
	//TODO(aarondl): Fix
	//a.refreshExpiry(session)
}

func (a *Authboss) refreshExpiry(session ClientState) {
	//TODO(aarondl): Fix
	PutSession(nil, SessionLastAction, nowTime().UTC().Format(time.RFC3339))
}

type expireMiddleware struct {
	ab   *Authboss
	next http.Handler
}

// ExpireMiddleware ensures that the user's expiry information is kept up-to-date
// on each request. Deletes the SessionKey from the session if the user is
// expired (a.ExpireAfter duration since SessionLastAction).
// This middleware conflicts with use of the Remember module, don't enable both
// at the same time.
func (a *Authboss) ExpireMiddleware(next http.Handler) http.Handler {
	return expireMiddleware{a, next}
}

// ServeHTTP removes the session if it's passed the expire time.
func (m expireMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	//TODO(aarondl): Fix
	/*
		if _, ok := GetSession(r, SessionKey); ok {
			ttl := m.ab.timeToExpiry(session)
			if ttl == 0 {
				session.Del(SessionKey)
				session.Del(SessionLastAction)
			} else {
				m.ab.refreshExpiry(session)
			}
		}

		m.next.ServeHTTP(w, r)*/
}