package moves

// The probe's attempt policy (moves spec §7.7, R12-2, INV-19).
//
// The window itself is not restated here. The activator's probeWindow and
// start loop (internal/activator/claimwindow.go, claimwake.go) already
// enforce the 30 second window counted from the attempt's first start, the
// absolute cut deadline before every start and before readiness is
// accepted, at most five starts and the doubling backoff between them. This
// file holds the one piece of policy that lives with the moves: how many
// attempts a probe is given. The per-attempt cost that prices them is
// budget.go's, and ProbeAttemptsMax is its ceiling.

// RecoveryAttempts is the number of probe attempts a recovery install is
// given (§7.7): three rounds of the landing's three, because a recovery has
// nowhere further to fall back to.
const RecoveryAttempts = 9

// Probe kinds, as the operation kinds the claim records.
const (
	ProbeLanding  = "landing"
	ProbeRecovery = "recovery"
)

// AttemptsFor is how many probe attempts a probe of the given kind may
// make. A landing gets the attempts T11 admitted (budget.go
// AttemptsAdmitted), at most ProbeAttemptsMax, and none when none were
// admitted. A recovery gets RecoveryAttempts whatever was admitted. A kind
// that is neither gets none.
func AttemptsFor(kind string, admitted int) int {
	switch kind {
	case ProbeLanding:
		return max(0, min(ProbeAttemptsMax, admitted))
	case ProbeRecovery:
		return RecoveryAttempts
	}
	return 0
}