package p2p

import "fmt"

var OurCaps = []Cap{
	{Name: "diff", Version: 1},
	{Name: "snap", Version: 1},
	{Name: "eth", Version: 65},
	{Name: "eth", Version: 66},
	{Name: "eth", Version: 67},
}

// Cap is the structure of a peer capability.
type Cap struct {
	Name    string
	Version uint
}

func (cap Cap) String() string {
	return fmt.Sprintf("%s/%d", cap.Name, cap.Version)
}

type capsByNameAndVersion []Cap

func (cs capsByNameAndVersion) Len() int      { return len(cs) }
func (cs capsByNameAndVersion) Swap(i, j int) { cs[i], cs[j] = cs[j], cs[i] }
func (cs capsByNameAndVersion) Less(i, j int) bool {
	return cs[i].Name < cs[j].Name || (cs[i].Name == cs[j].Name && cs[i].Version < cs[j].Version)
}