// Package naming centralizes the container/VM naming convention shared by the
// agent (which creates and reconciles containers) and the monitor (which looks
// them up by name). Keeping it in one place prevents the two from disagreeing.
package naming

import "strings"

// ContainerNameFor returns the expected container (or unikernel VM) name for a
// service and component. For single-component services where the component
// name equals the service name, the name is just the service name (e.g.,
// "mc-proxy" not "mc-proxy-mc-proxy").
func ContainerNameFor(service, component string) string {
	if service == component {
		return service
	}
	return service + "-" + component
}

// SplitContainerName splits a container name into service and component parts.
// It checks known service names first to handle names like "mc-proxy" where a
// naive split on "-" would produce the wrong result. If no known service
// matches, it falls back to splitting on the first "-".
func SplitContainerName(name string, knownServices map[string]bool) (service, component string) {
	if knownServices[name] {
		return name, name
	}
	for svc := range knownServices {
		prefix := svc + "-"
		if strings.HasPrefix(name, prefix) && len(name) > len(prefix) {
			return svc, name[len(prefix):]
		}
	}
	if i := strings.Index(name, "-"); i >= 0 {
		return name[:i], name[i+1:]
	}
	return name, name
}