package starnet

import "sync/atomic"

// StatsSnapshot is a read-only copy of runtime counters.
type StatsSnapshot struct {
	Accepted          uint64
	TLSDetected       uint64
	PlainDetected     uint64
	InitFailures      uint64
	SniffFailures     uint64
	TLSConfigFailures uint64
	PlainRejected     uint64
	Closed            uint64
}

// Stats provides lock-free counters.
type Stats struct {
	accepted          uint64
	tlsDetected       uint64
	plainDetected     uint64
	initFailures      uint64
	sniffFailures     uint64
	tlsConfigFailures uint64
	plainRejected     uint64
	closed            uint64
}

func (s *Stats) incAccepted()          { atomic.AddUint64(&s.accepted, 1) }
func (s *Stats) incTLSDetected()       { atomic.AddUint64(&s.tlsDetected, 1) }
func (s *Stats) incPlainDetected()     { atomic.AddUint64(&s.plainDetected, 1) }
func (s *Stats) incInitFailures()      { atomic.AddUint64(&s.initFailures, 1) }
func (s *Stats) incClosed()            { atomic.AddUint64(&s.closed, 1) }
func (s *Stats) incSniffFailures()     { atomic.AddUint64(&s.sniffFailures, 1); s.incInitFailures() }
func (s *Stats) incTLSConfigFailures() { atomic.AddUint64(&s.tlsConfigFailures, 1); s.incInitFailures() }
func (s *Stats) incPlainRejected()     { atomic.AddUint64(&s.plainRejected, 1); s.incInitFailures() }

// Snapshot returns a stable view of counters.
func (s *Stats) Snapshot() StatsSnapshot {
	return StatsSnapshot{
		Accepted:          atomic.LoadUint64(&s.accepted),
		TLSDetected:       atomic.LoadUint64(&s.tlsDetected),
		PlainDetected:     atomic.LoadUint64(&s.plainDetected),
		InitFailures:      atomic.LoadUint64(&s.initFailures),
		SniffFailures:     atomic.LoadUint64(&s.sniffFailures),
		TLSConfigFailures: atomic.LoadUint64(&s.tlsConfigFailures),
		PlainRejected:     atomic.LoadUint64(&s.plainRejected),
		Closed:            atomic.LoadUint64(&s.closed),
	}
}

// Logger is a minimal logging abstraction.
type Logger interface {
	Printf(format string, v ...interface{})
}