package main

import (
	"crypto/rand"
	"git.openprivacy.ca/openprivacy/libricochet-go/application"
	"git.openprivacy.ca/openprivacy/libricochet-go/application/examples/echobot/alicebot"
	"git.openprivacy.ca/openprivacy/libricochet-go/channels"
	"git.openprivacy.ca/openprivacy/libricochet-go/identity"
	"git.openprivacy.ca/openprivacy/log"
	"time"

	"git.openprivacy.ca/openprivacy/connectivity/tor"
	"golang.org/x/crypto/ed25519"
	"os"
)

// EchoBotInstance is an Instance of the EchoBot Application. One is created for every connected peer.
type EchoBotInstance struct {
	rai *application.Instance
	ra  *application.RicochetApplication
}

// Init establishes an EchoBotInstance
func (ebi *EchoBotInstance) Init(rai *application.Instance, ra *application.RicochetApplication) {
	ebi.rai = rai
	ebi.ra = ra
}

// OpenInbound is called when AliceBot opens a ChatChannel. In this case, because we want EchoBot to respond we
// need to open a new channel in the other direction.
func (ebi *EchoBotInstance) OpenInbound() {
	log.Debugln("OpenInbound() ChatChannel handler called...")
	outboutChatChannel := ebi.rai.Connection.Channel("im.ricochet.chat", channels.Outbound)
	if outboutChatChannel == nil {
		ebi.rai.Connection.Do(func() error {
			ebi.rai.Connection.RequestOpenChannel("im.ricochet.chat",
				&channels.ChatChannel{
					Handler: ebi,
				})
			return nil
		})
	}
}

// ChatMessage is called whenever a connected peer sends a message to EchoBot
func (ebi *EchoBotInstance) ChatMessage(messageID uint32, when time.Time, message string) bool {
	log.Infof("message from %v - %v", ebi.rai.RemoteHostname, message)
	ebi.SendChatMessage(ebi.rai, ebi.rai.RemoteHostname+" "+message)
	return true
}

// ChatMessageAck is called whenever a connected peer acknowledges a message that EchoBot sent.
func (ebi *EchoBotInstance) ChatMessageAck(messageID uint32, accepted bool) {

}

// SendChatMessage sends a chat message to the given echobot instance
func (ebi *EchoBotInstance) SendChatMessage(rai *application.Instance, message string) {
	ebi.rai.Connection.Do(func() error {
		channel := ebi.rai.Connection.Channel("im.ricochet.chat", channels.Outbound)
		// We are swallowing the message id and the error here, in reality you will want to handle it.
		channels.SendMessageOnChatChannel(channel, message)
		return nil
	})
}

// main() encapsulates an entire ricochet ecosystem, from starting tor, to generating onion service keys to managing
// the launching of both the echobot server and the alicebot peer.
// In most systems you will only be handling one or two of these subsystems at any given time so this example might seem
// bloated, but we have tried to highlight the most interesting aspects to allow easy application to new domains.
func main() {

	// Set up Logging.
	log.SetLevel(log.LevelInfo)
	log.AddEverythingFromPattern("connectivity")

	// Set up Tor
	acn, err := tor.NewTorACN(".", "")
	if err != nil {
		log.Errorf("Unable to start Tor: %v", err)
		os.Exit(1)
	}
	defer acn.Close()

	// Set up the Echobot Server
	echobot := new(application.RicochetApplication)
	cpubk, cprivk, err := ed25519.GenerateKey(rand.Reader)

	if err != nil {
		log.Errorf("Error generating keys: %v", err)
		os.Exit(1)
	}

	// Turn on the echobot onion service in Tor.
	listenService, err := acn.Listen(cprivk, application.RicochetPort)
	if err != nil {
		log.Errorf("error setting up onion service: %v", err)
		os.Exit(1)
	}

	// This next section looks complicated (and it is a little), but all it is doing is allowing echobot to handle
	// im.ricochet.chat type channels.
	af := application.InstanceFactory{}
	af.Init()
	af.AddHandler("im.ricochet.chat", func(rai *application.Instance) func() channels.Handler {
		ebi := new(EchoBotInstance)
		ebi.Init(rai, echobot)
		return func() channels.Handler {
			chat := new(channels.ChatChannel)
			chat.Handler = ebi
			return chat
		}
	})

	// Thee next few lines turn on echobot and make it available to listen to new connections.
	// Note that we initialize a V3 identity for echobot.
	echobot.Init(acn, "echobot", identity.InitializeV3("echobot", &cprivk, &cpubk), af, new(application.AcceptAllContactManager))
	log.Infof("echobot listening on %v", listenService.AddressFull())
	go echobot.Run(listenService)

	// Now we wait a little bit for everything to wire itself together.
	log.Infoln("counting to five ...")
	time.Sleep(time.Second * 5)

	// Finally, in these last few lines we setup an AliceBot who simply sends messages to echobot
	alice := alicebot.NewAliceBot(acn, listenService.AddressIdentity())
	alice.SendMessage("be gay")
	alice.SendMessage("do crime")

	// stick around and see what happens
	time.Sleep(time.Second * 30)
}