package server

import (
	"errors"

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

// Step3PostCard builds and returns the packed server messages that send the
// initiator's full ContactCard to the invitee through the invitee's servers.
// Step 3 must NOT use DR or sym layers: the invitee hasn't received those keys yet
// (they are carried inside this very message). Plain asym encryption is used.
func Step3PostCard(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)
	}

	step3msg, err := peer.BuildInvitationStep3Message(peer.GetMyContact())
	if err != nil {
		return nil, err
	}
	serialized, err := peer.SerializeUserMessage(step3msg)
	if err != nil {
		return nil, err
	}
	enc, err := peer.AsymEncryptMessage(serialized)
	if err != nil {
		return nil, err
	}
	packedMsg := peer.PackUserMessage(enc.Data, enc.Signature)

	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 invitee server")
	}
	return results, nil
}