lambda/main.go

package main

import (
	"strings"
	"os"
	"sync"

	"context"
	"fmt"
	"github.com/diamondburned/gotk4/pkg/gdk/v4"
	"github.com/diamondburned/gotk4/pkg/gdkpixbuf/v2"
	"github.com/diamondburned/gotk4/pkg/gio/v2"
	"github.com/diamondburned/gotk4/pkg/glib/v2"
	"github.com/diamondburned/gotk4/pkg/gtk/v4"
	"github.com/gen2brain/beeep"
	"github.com/go-analyze/charts"
	"golang.org/x/net/html/charset"
	"path/filepath"

	"github.com/BurntSushi/toml"
	"gosrc.io/xmpp"
	"gosrc.io/xmpp/stanza"
	"mellium.im/xmpp/jid"
	"time"

	_ "embed"
	"encoding/xml"
	"github.com/kr/pretty"
	"io"
	"runtime"
)

var loadedConfig lambdaConfig

var empty_dialog *gtk.Image

var connectionStatus *gtk.Label
var connectionIcon *gtk.Image

var mStatus *gtk.Label
var mIcon *gtk.Image

var pingStatus *gtk.Label

// var msgs *gtk.ListBox
var content *gtk.Widgetter

// var tabs map[string]*chatTab = make(map[string]*chatTab)
var tabs sync.Map
var current string

var scroller *gtk.ScrolledWindow
var memberList *gtk.ScrolledWindow
var menu *gtk.Box
var message_en *gtk.Entry

//go:embed style.css
var styleCSS string
var client xmpp.Sender
var clientroot *xmpp.Client

var uiQueue = make(chan func(), 100)

var window *gtk.ApplicationWindow

// stores members of mucs
var mucmembers sync.Map

// stores devices of users
var userdevices sync.Map

var pingTimes = [][]float64{}

var clientAssets map[string]gdk.Paintabler = make(map[string]gdk.Paintabler)

func init() {
	beeep.AppName = "Lambda"

	go func() {
		for fn := range uiQueue {
			glib.IdleAdd(func() bool {
				fn()
				return false
			})
			time.Sleep(10 * time.Millisecond) // Small delay between updates
		}
	}()

}

func main() {
	pingTimes = append(pingTimes, []float64{})
	p, err := ensureConfig()
	if err != nil {
		panic(err)
	}

	b, err := os.ReadFile(filepath.Join(p, "lambda.toml"))
	if err != nil {
		dropToSignInPage(err)
		return
		// panic(err)
	}

	_, err = toml.Decode(string(b), &loadedConfig)
	if err != nil {
		panic(err)
	}

	if loadedConfig.Resource == "" {
		fmt.Println("Config resource is empty! Generating a random one")
		loadedConfig.Resource = randomClientResource()
	}

	config := xmpp.Config{
		TransportConfiguration: xmpp.TransportConfiguration{
			Address: loadedConfig.Server,
			CharsetReader: func(c string, input io.Reader) (io.Reader, error) {
				return charset.NewReaderLabel(c, input)
			},
		},
		Jid:        loadedConfig.Username + "/" + loadedConfig.Resource,
		Credential: xmpp.Password(loadedConfig.Password),
		Insecure:   loadedConfig.Insecure,
		// StreamLogger:           os.Stdout,
		StreamManagementEnable: true,
	}
	router := xmpp.NewRouter()

	router.NewRoute().IQNamespaces(stanza.NSDiscoInfo).HandlerFunc(func(s xmpp.Sender, p stanza.Packet) {
		iq, ok := p.(*stanza.IQ)
		if !ok || iq.Type != stanza.IQTypeGet {
			return
		}

		iqResp, err := stanza.NewIQ(stanza.Attrs{Type: "result", From: iq.To, To: iq.From, Id: iq.Id})
		if err != nil {
			panic(err)
		}

		identity := stanza.Identity{
			Name:     "Lambda",
			Category: "client", // TODO: Allow spoofing on user request
			Type:     "pc",
		}
		payload := stanza.DiscoInfo{
			XMLName: xml.Name{
				Space: stanza.NSDiscoInfo,
				Local: "query",
			},
			Identity: []stanza.Identity{identity},
			Features: []stanza.Feature{
				{Var: stanza.NSDiscoInfo},
				{Var: stanza.NSDiscoItems},
				{Var: "jabber:iq:version"},
				{Var: "urn:xmpp:delegation:1"},
				{Var: "http://jabber.org/protocol/muc"},
				{Var: "λ"},
				{Var: "urn:xmpp:attention:0"},
			},
		}
		iqResp.Payload = &payload
		s.Send(iqResp)
	})

	router.NewRoute().IQNamespaces("jabber:iq:version").HandlerFunc(func(s xmpp.Sender, p stanza.Packet) {
		iq, ok := p.(*stanza.IQ)
		if !ok || iq.Type != stanza.IQTypeGet {
			return

		}

		iqResp, err := stanza.NewIQ(stanza.Attrs{Type: "result", From: iq.To, To: iq.From, Id: iq.Id})
		if err != nil {
			panic(err)
		}

		v := &stanza.Version{}
		v = v.SetInfo("Lambda", lambda_version, runtime.GOOS) // TODO: Allow spoofing on user request

		iqResp.Payload = v
		s.Send(iqResp)
	})

	router.HandleFunc("message", func(s xmpp.Sender, p stanza.Packet) {
		m, ok := p.(stanza.Message)
		if !ok {
			return
		}

		pretty.Println(m)

		e := stanza.PubSubEvent{}
		ok = m.Get(&e)
		if ok {
			fmt.Println(e)
		}

		/*
			if m.Body == "" {
				return
			}
		*/

		originator := JidMustParse(m.From).Bare()
		mStatus.SetText(originator)

		at := new(Attention)
		ok = m.Get(at)
		if ok {
			beeep.Notify("Attention", fmt.Sprintf("%s: %s", JidMustParse(m.From).Resource, m.Body), commentBytes) // TODO: Use localpart if DM
		}

		sc := new(SentCarbon)
		ok = m.Get(sc)
		if ok {
			fm, ok := sc.Forwarded.Stanza.(stanza.Message)
			if ok {
				if JidMustParse(fm.From).Bare() == JidMustParse(m.From).Bare() {
					p = sc.Forwarded.Stanza
					m = sc.Forwarded.Stanza.(stanza.Message)
				} else {
					panic(fmt.Sprintln("Impersonation: ", fm.From, m.From))
				}
			}
		}

		rc := new(SentCarbon)
		ok = m.Get(rc)
		if ok {
			fm, ok := rc.Forwarded.Stanza.(stanza.Message)
			if ok {
				if JidMustParse(fm.From).Bare() == JidMustParse(m.From).Bare() {
					p = rc.Forwarded.Stanza
					m = rc.Forwarded.Stanza.(stanza.Message)
				} else {
					panic(fmt.Sprintln("Impersonation: ", fm.From, m.From))
				}
			}
		}

		glib.IdleAdd(func() {
			//uiQueue <- func() {
			b := gtk.NewBox(gtk.OrientationVertical, 0)

			tab, ok := tabs.Load(originator)
			if !ok {
				return
			}

			typed_tab := tab.(*chatTab)

			if ok {
				typed_tab.msgs.Append(b)
				scrollToBottomAfterUpdate(scroller)
			} else {
				fmt.Println("Got message when the tab does not exist!")
			}

			ba, ok := generateMessageWidget(p).(*gtk.Box)
			if ok {
				b.Append(ba)
			}
			//}
		})
	})

	router.HandleFunc("presence", func(s xmpp.Sender, p stanza.Packet) {
		presence, ok := p.(stanza.Presence)
		if !ok {
			return
		}

		if presence.Error.Reason != "" {
			beeep.Notify(fmt.Sprintf("%s : %s", presence.From, presence.Error.Reason), presence.Error.Text, cancelBytes)
			return
		}

		var mu MucUser
		var ocu OccupantID

		ok = presence.Get(&mu)

		if ok { // This is a presence stanza from a user in a MUC
			presence.Get(&ocu)
			// id := ocu.ID
			// if id == "" {
			id := JidMustParse(presence.From).Resource
			// }
			from, _ := stanza.NewJid(presence.From)
			muc := from.Bare()
			_, ok = mucmembers.Load(muc)
			if !ok {
				mucmembers.Store(muc, mucUnit{})
			}

			unit, ok := mucmembers.Load(muc)
			if !ok {
				return
			}

			typed_unit := unit.(mucUnit)

			if presence.Type != "unavailable" {
				_, ok := typed_unit.Members.Load(id)
				if !ok {
					glib.IdleAdd(func() {
						b := gtk.NewBox(gtk.OrientationVertical, 0)
						ba, ok := generatePresenceWidget(p).(*gtk.Box)
						if ok {
							b = ba
						}

						tab, ok := tabs.Load(muc)
						typed_tab := tab.(*chatTab)

						if ok {
							typed_tab.msgs.Append(b)
							scrollToBottomAfterUpdate(scroller)
						} else {
							fmt.Println("Got message when the tab does not exist!")
						}
					})
				}
				typed_unit.Members.Store(id, presence)
			} else {
				typed_unit.Members.Delete(id)
				glib.IdleAdd(func() {
					b := gtk.NewBox(gtk.OrientationVertical, 0)
					ba, ok := generatePresenceWidget(p).(*gtk.Box)
					if ok {
						b = ba
					}

					tab, ok := tabs.Load(muc)
					typed_tab := tab.(*chatTab)

					if ok {
						typed_tab.msgs.Append(b)
						scrollToBottomAfterUpdate(scroller)
					} else {
						fmt.Println("Got message when the tab does not exist!")
					}
				})
			}

			mucmembers.Store(muc, typed_unit)

		} else { // This is a presence stanza from a regular user
			// The code is basically the exact same as above, we just don't check for mucuser
			user := jid.MustParse(presence.From).Bare().String()
			_, ok := userdevices.Load(user)
			_, mok := mucmembers.Load(user)
			if !ok && !mok { // FIXME: The initial muc presence gets picked up from this check
				ok := createTab(user, false)
				if ok {
					userdevices.Store(user, userUnit{})

					b := gtk.NewLabel(user)
					gesture1 := gtk.NewGestureClick()
					gesture1.SetButton(1)
					gesture1.Connect("pressed", func() {
						switchToTab(user, &window.Window)
					})

					b.AddController(gesture1)
					menu.Append(b)
				}
			}

			unit, ok := userdevices.Load(user)
			if !ok {
				return
			}

			resource := jid.MustParse(presence.From).Resourcepart()

			typed_unit := unit.(userUnit)

			if presence.Type != "unavailable" {
				typed_unit.Devices.Store(resource, presence)
			} else {
				typed_unit.Devices.Delete(resource)
			}

			userdevices.Store(user, typed_unit)
		}
		time.Sleep(1 * time.Second)
	})

	c, err := xmpp.NewClient(&config, router, func(err error) {
		connectionStatus.SetText(fmt.Sprintf("Disconnected: %s", err.Error()))
		connectionIcon.SetFromPaintable(clientAssets["disconnect"])
	})

	if err != nil {
		showErrorDialog(err)
		panic(err)
	}
	client = c
	clientroot = c

	cm := xmpp.NewStreamManager(c, func(c xmpp.Sender) {
		fmt.Println("XMPP client connected")
		go func() {
			for {
				time.Sleep(5 * time.Second)
				pingStatus.AddCSSClass("pending")
				before := time.Now()
				iq := new(stanza.IQ)
				iq.From = clientroot.Session.BindJid
				iq.To = iq.From
				iq.Type = "get"

				ctx, _ := context.WithTimeout(context.Background(), 30*time.Second)
				mychan, err := client.SendIQ(ctx, iq)
				if err != nil {
					continue
				}
				_ = <-mychan

				pingStatus.RemoveCSSClass("pending")
				delay := time.Since(before) / time.Millisecond
				pingStatus.SetText(fmt.Sprintf("%d ms", delay))
				pingTimes[0] = append(pingTimes[0], float64(delay))

			}
		}()
		connectionStatus.SetText(fmt.Sprintf("Connected as %s", JidMustParse(clientroot.Session.BindJid).Bare()))
		connectionStatus.SetTooltipText(fmt.Sprintf("Binded JID: %s\nUsing TLS: %t", clientroot.Session.BindJid, clientroot.Session.TlsEnabled))
		connectionIcon.SetFromPaintable(clientAssets["connect"])
		// Enable carbons
		client.SendRaw(fmt.Sprintf(
			`<iq xmlns='jabber:client'
				from='%s'
				id='enable1'
				type='set'>
			  <enable xmlns='urn:xmpp:carbons:2'/>
			</iq>
		`, clientroot.Session.BindJid))

		// Join rooms in bookmarks
		if loadedConfig.JoinBookmarks {
			books, err := stanza.NewItemsRequest("", "urn:xmpp:bookmarks:1", 0)
			if err == nil {
				mychan, err := c.SendIQ(context.TODO(), books)
				result := <-mychan
				if err == nil {
					res, ok := result.Payload.(*stanza.PubSubGeneric)
					if ok {
						for _, item := range res.Items.List {
							go func() {
								jid := item.Id
								node := item.Any
								autojoin := false
								nick := loadedConfig.Nick
								for _, attr := range node.Attrs {
									if attr.Name.Local == "autojoin" {
										autojoin = attr.Value == "true"
									}
								}

								for _, node := range node.Nodes {
									if node.XMLName.Local == "nick" {
										nick = node.Content
									}
								}

								_, ok := tabs.Load(jid)
								if !ok && autojoin {
									err := joinMuc(client, clientroot.Session.BindJid, jid, nick)
									if err != nil {
										panic(err)
									}

									createTab(jid, true)
									b := gtk.NewLabel(jid)
									gesture1 := gtk.NewGestureClick()
									gesture1.SetButton(1)
									gesture1.Connect("pressed", func() {
										switchToTab(jid, &window.Window)
									})

									b.AddController(gesture1)
									menu.Append(b)
								}
							}()
						}
					}
				}
			}
		}
	})

	go func() {
		time.Sleep(3 * time.Second)
		connectionStatus.SetText("Connecting...")
		connectionIcon.SetFromPaintable(clientAssets["hourglass"])

		err = cm.Run()
		if err != nil {
			fmt.Println(err.Error())
			connectionStatus.SetText(fmt.Sprintf("Disconnected: %s", err.Error()))
			connectionIcon.SetFromPaintable(clientAssets["disconnect"])
		}
	}()

	app := gtk.NewApplication("net.sunglocto.lambda", gio.ApplicationFlagsNone)
	app.ConnectActivate(func() { activate(app) })

	if code := app.Run(os.Args); code > 0 {
		os.Exit(code)
	}
}

func activate(app *gtk.Application) {
	// Load the CSS and apply it globally.
	gtk.StyleContextAddProviderForDisplay(
		gdk.DisplayGetDefault(), loadCSS(styleCSS),
		gtk.STYLE_PROVIDER_PRIORITY_APPLICATION,
	)

	window = gtk.NewApplicationWindow(app)
	the_menu := gio.NewMenu()

	fileMenu := gio.NewMenu()
	fileMenu.Append("Join MUC", "app.join")
	fileMenu.Append("Start DM", "app.dm")
	fileMenu.Append("Destroy MUC", "app.destroymuc")

	helpMenu := gio.NewMenu()
	helpMenu.Append("About", "app.about")

	aboutAction := gio.NewSimpleAction("about", nil)
	aboutAction.ConnectActivate(func(p *glib.Variant) {
		a := gtk.AboutDialog{}
		a.SetVisible(true)
	})

	destroymucAction := gio.NewSimpleAction("destroymuc", nil)
	destroymucAction.ConnectActivate(func(p *glib.Variant) {
		cur, ok := tabs.Load(current)
		if ok {
			cur := cur.(*chatTab)
			if cur.isMuc {
				win := gtk.NewWindow()
				win.SetTitle("Destroy MUC")
				win.SetDefaultSize(400, 1)
				win.SetResizable(false)

				box := gtk.NewBox(gtk.OrientationVertical, 0)
				box.Append(gtk.NewLabel("Are you sure? This MUC will be gone forever! (a very long time)"))
				box.Append(gtk.NewLabel("If you wish to continue, type 'I understand'"))
				cancel := gtk.NewButtonWithLabel("Cancel")
				cancel.ConnectClicked(func() {
					win.SetVisible(false)
				})
				en := gtk.NewEntry()
				en.SetPlaceholderText("...")

				submit := gtk.NewButtonWithLabel("Destroy")
				submit.ConnectClicked(func() {
					fmt.Println(en.Text())
					if en.Text() == "I understand" {
						cur, ok := tabs.Load(current)
						if ok {
							cur := cur.(*chatTab)
							if cur.isMuc {
								client.SendRaw(fmt.Sprintf(`
				<iq from='%s'
				id='begone'
				to='%s'
				type='set'>
				<query xmlns='http://jabber.org/protocol/muc#owner'>
				<destroy jid='%s'>
				<reason>User requested</reason>
				</destroy>
				</query>
				</iq>
				`, clientroot.Session.BindJid, current, JidMustParse(clientroot.Session.BindJid).Bare()))
							}
						}
						win.SetVisible(false)
					}
				})

				box.Append(en)
				box.Append(submit)
				box.Append(cancel)

				mu, ok := mucmembers.Load(current)
				if ok {
					typed_mu := mu.(mucUnit)
					typed_mu.Members.Range(func(k, v any) bool {
						user, ok := v.(stanza.Presence)
						if ok {
							mu := MucUser{}
							ok := user.Get(&mu)
							if ok {
								if mu.MucUserItem.JID != "" {
									if JidMustParse(mu.MucUserItem.JID).Bare() == JidMustParse(clientroot.Session.BindJid).Bare() {
										if mu.MucUserItem.Affiliation != "owner" {
											box.Append(gtk.NewLabel("You are not an owner of this MUC and thus will most likely not be able to delete it"))
										}
										// return false
									}
								}
							} else {
								panic("not ok")
							}
						} else {
							panic("not ok")
						}
						return true
					})
				} else {
					panic("not ok")
				}

				win.SetChild(box)
				win.SetVisible(true)
			}
		}

	})

	joinAction := gio.NewSimpleAction("join", nil)
	joinAction.ConnectActivate(func(p *glib.Variant) {
		box := gtk.NewBox(gtk.OrientationVertical, 0)
		jid_box := gtk.NewBox(gtk.OrientationHorizontal, 0)
		nick_box := gtk.NewBox(gtk.OrientationHorizontal, 0)

		jid_entry := gtk.NewEntry()
		nick_entry := gtk.NewEntry()

		jid_entry.SetHAlign(gtk.AlignEnd)
		jid_entry.SetHExpand(true)

		nick_entry.SetHAlign(gtk.AlignEnd)
		nick_entry.SetHExpand(true)

		nick_entry.SetText(loadedConfig.Nick)

		jid_box.Append(gtk.NewLabel("MUC JID:"))
		jid_box.Append(jid_entry)

		nick_box.Append(gtk.NewLabel("Nick:"))
		nick_box.Append(nick_entry)

		box.Append(jid_box)
		box.Append(nick_box)

		btn := gtk.NewButtonWithLabel("Submit")
		btn.SetVAlign(gtk.AlignBaseline)

		box.Append(btn)

		win := gtk.NewWindow()
		win.SetTitle("Join MUC")
		win.SetDefaultSize(400, 1)
		win.SetResizable(false)
		win.SetChild(box)

		btn.ConnectClicked(func() {
			t := jid_entry.Text()
			_, ok := tabs.Load(t)
			if !ok {
				err := joinMuc(client, clientroot.Session.BindJid, t, nick_entry.Text())
				if err != nil {
					panic(err)
				}

				createTab(t, true)
				b := gtk.NewLabel(t)
				gesture1 := gtk.NewGestureClick()
				gesture1.SetButton(1)
				gesture1.Connect("pressed", func() {
					switchToTab(t, &window.Window)
				})

				b.AddController(gesture1)
				menu.Append(b)
			}
			win.SetVisible(false)
		})

		win.SetTransientFor(win)
		win.Present()
	})

	app.AddAction(joinAction)
	app.AddAction(aboutAction)
	app.AddAction(destroymucAction)

	the_menu.AppendSubmenu("File", fileMenu)
	the_menu.AppendSubmenu("Help", helpMenu)

	the_menuBar := gtk.NewPopoverMenuBarFromModel(the_menu)
	app.SetMenubar(gio.NewMenu())

	window.SetTitle("Lambda")
	window.Window.AddCSSClass("ssd")
	window.Window.SetDefaultSize(500, 500)
	menu = gtk.NewBox(gtk.OrientationVertical, 0)

	empty_dialog = gtk.NewImageFromPaintable(clientAssets["disabled_logo"])
	empty_dialog.SetPixelSize(100)
	empty_dialog.SetVExpand(true)

	scroller = gtk.NewScrolledWindow()
	memberList = gtk.NewScrolledWindow()

	scroller.SetHExpand(true)
	memberList.SetHExpand(true)

	box := gtk.NewBox(gtk.OrientationVertical, 0)
	box.Append(the_menuBar)

	statBar := gtk.NewBox(gtk.OrientationHorizontal, 0)

	cBox := gtk.NewBox(gtk.OrientationHorizontal, 0)
	connectionIcon = gtk.NewImageFromPaintable((clientAssets["disconnect"]))
	connectionIcon.AddCSSClass("icon")
	connectionStatus = gtk.NewLabel("Disconnected")

	cBox.Append(connectionIcon)
	cBox.Append(connectionStatus)

	statBar.Append(cBox)

	mBox := gtk.NewBox(gtk.OrientationHorizontal, 0)

	gesture1 := gtk.NewGestureClick()
	gesture1.SetButton(1)
	gesture1.Connect("pressed", func() {
		current = mStatus.Text()
		switchToTab(current, &window.Window)
	})

	mIcon = gtk.NewImageFromPaintable((clientAssets["comment"]))
	mIcon.AddCSSClass("icon")
	mStatus = gtk.NewLabel("-")
	mStatus.AddController(gesture1)

	cBox.Append(mIcon)
	cBox.Append(mStatus)

	statBar.Append(mBox)

	pBox := gtk.NewBox(gtk.OrientationHorizontal, 0)
	pBox.SetTooltipText("Ping between you and your XMPP server\nRight-click to see graph")
	gesture := gtk.NewGestureClick()
	gesture.SetButton(3)
	gesture.Connect("pressed", func() {
		opt := charts.NewLineChartOptionWithData(pingTimes)
		opt.Title = charts.TitleOption{
			Text: "Server latency",
		}
		/*
			opt.XAxis.Labels = []string{
				// The 7 labels here match to the 7 values above
				"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun",
			}*/
		opt.Legend = charts.LegendOption{
			SeriesNames: []string{
				"Ping (ms)",
			},
		}

		opt.StrokeSmoothingTension = 0.9

		p := charts.NewPainter(charts.PainterOptions{
			Width:  600,
			Height: 400,
		})
		err := p.LineChart(opt)
		if err != nil {
			panic(err)
		}

		buf, err := p.Bytes()
		if err != nil {
			panic(err)
		}

		loader := gdkpixbuf.NewPixbufLoader()
		loader.Write(buf)
		loader.Close()

		i := gtk.NewPictureForPaintable(gdk.NewTextureForPixbuf(loader.Pixbuf()))
		win := gtk.NewWindow()
		win.SetDefaultSize(600, 400)
		win.SetTitle("Server latency")
		box := gtk.NewBox(gtk.OrientationVertical, 0)
		box.Append(i)
		win.SetChild(box)
		win.SetVisible(true)
	})
	pBox.AddController(gesture)

	i := (gtk.NewImageFromPaintable(clientAssets["chart_bar"]))
	i.AddCSSClass("icon")
	pBox.Append(i)
	pingStatus = gtk.NewLabel("...")
	pBox.Append(pingStatus)
	statBar.Append(pBox)

	scrollerStatBar := gtk.NewScrolledWindow()
	scrollerStatBar.SetChild(statBar)
	box.Append(scrollerStatBar)

	// scroller.SetChild(empty_dialog)
	scroller.SetChild(empty_dialog)
	menu_scroll := gtk.NewScrolledWindow()
	menu_scroll.SetHExpand(true)

	menu_scroll.SetChild(menu)
	// box.Append(menu_scroll)

	chatbox := gtk.NewBox(gtk.OrientationHorizontal, 0)
	// chatbox.Append(menu_scroll)
	chat_pane := gtk.NewPaned(gtk.OrientationHorizontal)
	chat_pane.SetStartChild(scroller)
	chat_pane.SetEndChild(memberList)
	chat_pane.SetPosition(225)

	main_pane := gtk.NewPaned(gtk.OrientationHorizontal)
	main_pane.SetStartChild(menu_scroll)
	main_pane.SetEndChild(chat_pane)
	main_pane.SetPosition(135)

	chatbox.Append(main_pane)
	box.Append(chatbox)

	entry_box := gtk.NewBox(gtk.OrientationHorizontal, 0)

	oob_en := gtk.NewEntry()
	oob_en.SetPlaceholderText("Embed URL")

	message_en = gtk.NewEntry()
	message_en.SetPlaceholderText("Say something, what else are you gonna do here?")
	b := gtk.NewButtonWithLabel("Send")

	sendtxt := func() {
		t := message_en.Text()
		if t == "" {
			dialog := &gtk.AlertDialog{}
			dialog.SetDetail("detail")
			dialog.SetMessage("message")
			dialog.SetButtons([]string{"yes, no"})
			dialog.Choose(context.TODO(), &window.Window, nil)
		}

		message_type := stanza.MessageTypeChat
		tab, ok := tabs.Load(current)
		if !ok {
			return
		}

		typed_tab := tab.(*chatTab)
		if typed_tab.isMuc {
			message_type = stanza.MessageTypeGroupchat
		}

		exts := []stanza.MsgExtension{}
		if oob_en.Text() != "" {
			new_oob := new(stanza.OOB)
			new_oob.URL = oob_en.Text()
			exts = append(exts, new_oob)
		}

		if strings.Contains(t, "@everyone") {
			new_mention := new(Mention)
			new_mention.Mentions = "urn:xmpp:mentions:0#channel"
			exts = append(exts, new_mention)
		} else if strings.Contains(t, "@here") {
			new_attention := new(Attention)
			exts = append(exts, new_attention)
		}

		err := sendMessage(client, current, message_type, t, "", "", exts)
		if err != nil {
			panic(err) // TODO: Show error message via GTK
		}
		message_en.SetText("")
		scrollToBottomAfterUpdate(scroller)
	}

	message_en.Connect("activate", sendtxt)

	b.ConnectClicked(sendtxt)

	message_en.SetHExpand(true)

	entry_box.Append(oob_en)
	entry_box.Append(message_en)
	entry_box.Append(b)

	box.Append(entry_box)

	window.SetChild(box)

	window.SetVisible(true)
}

func loadCSS(content string) *gtk.CSSProvider {
	prov := gtk.NewCSSProvider()
	prov.LoadFromString(content)
	return prov
}