package instancectl

import (
	"path"
	"strings"

	"github.com/carlosframework/platform/internal/provision"
	"github.com/carlosframework/platform/internal/registry"
)

func BoundClaimUnitControlGroup(host, unit string) string {
	return path.Join(parentSlices, SliceName(host), unit)
}

func (u ClaimUnits) Placement(host string) (string, string, error) {
	if !provision.ValidHostShape(host) {
		return "", "", ErrClaimUnit
	}
	if u.BoundHost == "" && u.BoundUnit == "" {
		return UnitName(RoleRun, host), ClaimUnitControlGroup(host), nil
	}
	if u.BoundHost != host || !ValidBoundClaimUnit(u.BoundUnit) {
		return "", "", ErrClaimUnit
	}
	return u.BoundUnit, BoundClaimUnitControlGroup(host, u.BoundUnit), nil
}

func ValidBoundClaimUnit(unit string) bool {
	return registry.ValidUnitName(unit) && strings.HasSuffix(unit, ".service") &&
		!strings.HasPrefix(unit, "-") && !strings.HasSuffix(unit, "@.service") &&
		!strings.HasPrefix(unit, "carlos-instance") && !strings.ContainsAny(unit, "%\\ \t\n\r\x00/")
}