package admin

import (
	"chain"
	"chain/runtime"
)

const (
	SetProtocolEvent = "SetProtocol"
)

var (
	protocolAddr address
)

func init() {
	caller := runtime.OriginCaller()
	protocolAddr = caller
}

func GetProtocol() address {
	return protocolAddr
}

func SetProtocol(cur realm, addr address) {
	caller := runtime.OriginCaller()

	if caller != admin {
		panic("admin access required to set protocol")
	}

	if !addr.IsValid() {
		panic("invalid address")
	}

	oldAddr := protocolAddr
	protocolAddr = addr

	chain.Emit(
		SetProtocolEvent,
		"admin", caller.String(),
		"oldAddr", oldAddr.String(),
		"newAddr", addr.String(),
	)
}

func IsProtocol(address address) bool {
	return address == protocolAddr
}