package server

import (
	"errors"

	"forge.redroom.link/yves/meowlib/client"
)

// Step4PostConfirmation builds and returns the packed server messages that send the
// invitee's confirmation to the initiator through the initiator's servers.
func Step4PostConfirmation(invitationId string) ([][]byte, error) {
	id := client.GetConfig().GetIdentity()
	peer := id.Peers.GetFromInvitationId(invitationId)
	if peer == nil {
		return nil, errors.New("no peer for invitation id " + invitationId)
	}

	step4msg, err := peer.BuildInvitationStep4Message()
	if err != nil {
		return nil, err
	}
	packedMsg, err := peer.ProcessOutboundUserMessage(step4msg)
	if err != nil {
		return nil, err
	}

	var results [][]byte
	for _, srvUid := range peer.ContactPullServers {
		srv, err := id.MessageServers.LoadServer(srvUid)
		if err != nil {
			continue
		}
		toSrvMsg := srv.BuildToServerMessageFromUserMessage(packedMsg)
		bytemsg, err := srv.ProcessOutboundMessage(toSrvMsg)
		if err != nil {
			continue
		}
		results = append(results, bytemsg)
	}
	if len(results) == 0 {
		return nil, errors.New("could not build message for any initiator server")
	}
	return results, nil
}