package main

import (
	"os"
	"sync"

	"context"
	"fmt"
	"github.com/diamondburned/gotk4/pkg/gdk/v4"
	"github.com/diamondburned/gotk4/pkg/gio/v2"
	"github.com/diamondburned/gotk4/pkg/glib/v2"
	"github.com/diamondburned/gotk4/pkg/gtk/v4"

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

	_ "embed"
	"encoding/xml"
	"runtime"

)

var loadedConfig lambdaConfig

var empty_dialog *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

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

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

// stores members of mucs
var mucmembers sync.Map

// stores devices of users 
var userdevices sync.Map

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

func main() {

	b, err := os.ReadFile("lambda.toml")
	if err != nil {
		showErrorDialog(err)
		panic(err)
	}

	_, err = toml.Decode(string(b), &loadedConfig)

	config := xmpp.Config{
		TransportConfiguration: xmpp.TransportConfiguration{
			Address: loadedConfig.Server,
		},
		Jid:          loadedConfig.Username,
		Credential:   xmpp.Password(loadedConfig.Password),
		Insecure:     loadedConfig.Insecure,
		StreamLogger: os.Stdout,
	}
	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: "urn:xmpp:reply: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
		}

		if m.Body == "" {
			return
		}

		originator := jid.MustParse(m.From).Bare().String()

		glib.IdleAdd(func() {
			uiQueue <- func() {
				b := gtk.NewBox(gtk.OrientationVertical, 0)
				ba, ok := generateMessageWidget(p).(*gtk.Box)
				if ok {
					b = ba
				}

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

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

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

		if presence.Error != *new(stanza.Err) {
			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)
			muc := jid.MustParse(presence.From).Bare().String()
			_, 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" {
				typed_unit.Members.Store(ocu.ID, presence)
			} else {
				typed_unit.Members.Delete(ocu.ID)
			}

			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)
			if !ok {
				userdevices.Store(user, userUnit{})
				createTab(user, false)

			b := gtk.NewButtonWithLabel(user)
			b.ConnectClicked(func() {
				b.AddCSSClass("accent")
				switchToTab(user)
			})
			menu.Append(b)
			}

			unit, ok := userdevices.Load(user)
			if !ok {
				fmt.Println("Could not load user presence even after recreating it! Something weird is going on!")
				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)
		}
	})

	c, err := xmpp.NewClient(&config, router, func(err error) {
		showErrorDialog(err)
		panic(err)
	})
	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() {
		err = cm.Run()
		if err != nil {
			showErrorDialog(err)
			panic(err)
		}
	}()

	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)
	app.SetMenubar(gio.NewMenu())

	window.SetTitle("Lambda")
	window.Window.AddCSSClass("ssd")
	menu = gtk.NewBox(gtk.OrientationHorizontal, 0)
	/*
		f_menu := gtk.NewMenuButton()
		f_menu.SetLabel("File")
		f_menu.SetAlwaysShowArrow(false)

		e_menu := gtk.NewMenuButton()
		e_menu.SetLabel("Edit")
		e_menu.SetAlwaysShowArrow(false)

		v_menu := gtk.NewMenuButton()
		v_menu.SetLabel("View")
		v_menu.SetAlwaysShowArrow(false)

		b_menu := gtk.NewMenuButton()
		b_menu.SetLabel("Bookmarks")
		b_menu.SetAlwaysShowArrow(false)

		h_menu := gtk.NewMenuButton()
		h_menu.SetLabel("Help")
		h_menu.SetAlwaysShowArrow(false)

		menu.Append(f_menu)
		menu.Append(e_menu)
		menu.Append(v_menu)
		menu.Append(b_menu)
		menu.Append(h_menu)
	*/

	empty_dialog = gtk.NewLabel("You are not focused on any chats.")
	empty_dialog.SetVExpand(true)

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

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

	box := gtk.NewBox(gtk.OrientationVertical, 0)
	// scroller.SetChild(empty_dialog)
	scroller.SetChild(empty_dialog)
	menu_scroll := gtk.NewScrolledWindow()
	menu_scroll.SetChild(menu)
	box.Append(menu_scroll)

	chatbox := gtk.NewBox(gtk.OrientationHorizontal, 0)
	chatbox.Append(scroller)
	chatbox.Append(memberList)
	box.Append(chatbox)

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

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

	sendtxt := func() {
		t := 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 
		} 

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

	en.Connect("activate", sendtxt)

	b.ConnectClicked(sendtxt)

	en.SetHExpand(true)

	m_entry := gtk.NewEntry()

	entry_box.Append(en)
	entry_box.Append(b)

	entry_box.Append(m_entry)

	debug_btn := gtk.NewButtonWithLabel("Join muc")

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

			createTab(t, true)
			b := gtk.NewButtonWithLabel(t)
			b.ConnectClicked(func() {
				b.AddCSSClass("accent")
				switchToTab(t)
			})
			menu.Append(b)
		}

	})

	entry_box.Append(debug_btn)

	box.Append(entry_box)

	window.SetChild(box)

	window.SetVisible(true)
}

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