package console

import (
	"errors"
	"log"
	"net/http"
)

// ErrTemporaryApp is the store operations' refusal (RenameAppIn, MoveApp,
// SetAppControlPlane(…, true)) for a row with expires_at > 0. A temporary
// row cannot change its name, its account, or its protection class
// (temporary static sites spec §4): rename and move would point it at bucket
// state it did not create, and the control-plane flag would take it out of
// automatic destruction's reach.
var ErrTemporaryApp = errors.New("the app is temporary. Make it permanent first with carlos apps keep")

// temporaryRefusal answers "may this door proceed?" for the §4 table. msg is
// "" when the app is not temporary; otherwise the sentence to show, naming
// `carlos apps keep`, and the status a JSON door sends. A row that cannot be
// read refuses with 503: "could not check" is not "permanent".
//
// Callers MUST be past their own membership gate first, for the same reason
// controlPlaneRefusal gives: consulted earlier, this is an oracle.
//
// action is a whole clause ("ship a binary release to it"), so the sentence
// reads as English for every door.
func (s *Server) temporaryRefusal(acct *Account, app, action string) (msg string, status int) {
	life, err := s.store.AppLife(acct.ID, app)
	if err != nil {
		log.Printf("console: temporary check %s/%s: %v", acct.Sqid, app, err)
		return "Could not check whether " + app + " is temporary. Nothing was changed. Try again.",
			http.StatusServiceUnavailable
	}
	if life == nil || !life.Temporary() {
		return "", 0
	}
	return app + " is temporary, so you cannot " + action + ". " +
			"Make it permanent first with: carlos apps keep --app " + app,
		http.StatusConflict
}

// refuseTemporary is temporaryRefusal for the JSON doors: it writes the
// refusal and returns true when the caller must stop.
func (s *Server) refuseTemporary(w http.ResponseWriter, acct *Account, app, action string) bool {
	msg, status := s.temporaryRefusal(acct, app, action)
	if msg == "" {
		return false
	}
	jsonError(w, status, msg)
	return true
}