package helpers

import (
	"C"
	"fmt"
	"os"
	"strings"

	"forge.redroom.link/yves/meowlib"
	"forge.redroom.link/yves/meowlib/client"
)
import (
	"errors"

	"google.golang.org/protobuf/proto"
)

// InvitationAnswer
func InvitationAnswer(cc *meowlib.ContactCard, nickname string, myNickname string, serverUids []string) (*client.Peer, string, error) {

	mynick := myNickname
	// my nickname for that contact

	if myNickname == "" {
		mynick = client.GetConfig().GetIdentity().Nickname
	}

	// build my contact card for that friend
	peer := client.GetConfig().GetIdentity().AnswerInvitation(mynick, nickname, serverUids, cc)

	//peerstr, err := json.Marshal(peer)
	//fmt.Println("InvitationAnswer: " + string(peerstr))
	c := client.GetConfig()
	c.GetIdentity().Save()

	return peer, "", nil
}

// InvitationAnswerFile
func InvitationAnswerFile(invitationFile string, nickname string, myNickname string, serverUids []string) (string, error) {
	format := "qr"
	var filename string = ""
	var cc *meowlib.ContactCard
	c := client.GetConfig()
	if _, err := os.Stat(invitationFile); os.IsNotExist(err) {
		return "InvitationAnswerFile : os.Stat", err
	}
	if strings.HasSuffix(invitationFile, ".mwiv") {
		format = "mwiv"
		data, err := os.ReadFile(invitationFile)
		if err != nil {
			return "InvitationAnswerFile : os.ReadFile", err
		}
		cc, err = meowlib.NewContactCardFromCompressed(data)
		if err != nil {
			return "InvitationAnswerFile : NewContactCardFromCompressed", err
		}
	}
	identity := client.GetConfig().GetIdentity()
	if cc != nil {
		isAnswer, proposed, received, _ := identity.CheckInvitation(cc)
		if isAnswer {
			fmt.Fprintln(os.Stdout, "This is already a response "+proposed+" to your invitation.")
			fmt.Fprintln(os.Stdout, "You cannot answer again.")
			fmt.Fprintln(os.Stdout, "You should finalize it by importing "+proposed+" contact card to your meow.")
			fmt.Fprintln(os.Stdout, "Use : 'meow invitation finalize "+invitationFile+"' to do it.")

		} else {
			mynick := myNickname
			// my nickname for that contact

			if myNickname == "" {
				mynick = client.GetConfig().GetIdentity().Nickname
			}

			response := identity.AnswerInvitation(mynick, nickname, serverUids, cc)
			fmt.Fprintln(os.Stdout, "Invitation sent by "+received)
			if format == "qr" {
				filename = c.StoragePath + string(os.PathSeparator) + mynick + "-" + nickname + ".png"
				response.GetMyContact().WriteQr(filename)
			} else {
				filename = c.StoragePath + string(os.PathSeparator) + mynick + "-" + nickname + ".mwiv"
				response.GetMyContact().WriteCompressed(filename)
			}
			client.GetConfig().GetIdentity().Save()
		}

	}
	return "", nil
}

// InvitationAnswerMessage
func InvitationAnswerMessage(invitationId string, invitationServerUid string) ([]byte, string, error) {

	// find the peer with that invitation id
	var peer *client.Peer
	for i := len(client.GetConfig().GetIdentity().Peers) - 1; i >= 0; i-- { //! to allow self invitation : testing only, findinc the received peer before myself
		// for i := 0; i < len(client.GetConfig().GetIdentity().Peers); i++ {
		if client.GetConfig().GetIdentity().Peers[i].InvitationId == invitationId {
			peer = client.GetConfig().GetIdentity().Peers[i]
			break
		}
	}
	if peer == nil {
		// declare a custom go error for no peer found
		return nil, "InvitationAnswerMessage: loop for peer", errors.New("no peer with that invitation id")
	}
	answermsg, err := peer.BuildInvitationAnswerMessage(peer.GetMyContact())
	if err != nil {
		return nil, "InvitationAnswerMessage: BuildInvitationAnswserMessage", err
	}
	// Server: get the invitation server
	invitationServer, err := client.GetConfig().GetIdentity().MessageServers.LoadServer(invitationServerUid)
	if err != nil {
		return nil, "InvitationAnswerMessage: LoadServer", err
	}

	// this will be the invitation's payload
	packedMsg, err := peer.ProcessOutboundUserMessage(answermsg)
	if err != nil {
		return nil, "InvitationAnswerMessage: ProcessOutboundUserMessage", err
	}
	// Creating Server message for transporting the user message
	toServerMessage := invitationServer.BuildToServerMessageFromUserMessage(packedMsg)
	// move the payload to invitation
	toServerMessage.Messages = nil
	invitationPayload, err := proto.Marshal(packedMsg)
	if err != nil {
		return nil, "InvitationAnswerMessage: proto.Marshal", err
	}
	toServerMessage.Invitation.Payload = invitationPayload
	toServerMessage.Invitation = &meowlib.Invitation{Step: 3}
	toServerMessage.Invitation.From = peer.MyIdentity.Public
	bytemsg, err := invitationServer.ProcessOutboundMessage(toServerMessage)
	if err != nil {
		return nil, "InvitationAnswerMessage: ProcessOutboundMessage", err
	}
	return bytemsg, "", nil
}