package components

import (
	"time"

	"github.com/maxence-charriere/go-app/v9/pkg/app"
	"github.com/mlctrez/goapp-mdc/pkg/base"
	"github.com/mlctrez/goapp-mdc/pkg/icon"
	"github.com/mlctrez/goapp-mdc/pkg/textfield"
	log "github.com/sirupsen/logrus"
	"go.mills.io/saltyim"
	"go.mills.io/saltyim/internal/pwa/storage"
	"go.yarn.social/lextwt"
)

const (
	descText                   = `salty.im is an open specification for a new Saltpack based e2e encrypted messaging protocol and platform for secure communications with a focus on privacy, security and being self-hosted.`
	saltyChatRecvMessageAction = "saltychat.recv-message.action"
	saltyChatSentMessageAction = "saltychat.sent-message.action"
)

var client *saltyim.Client

// SaltyChat ...
type SaltyChat struct {
	app.Compo
	base.JsUtil
	isAppInstallable bool

	dialog  *ModalDialog
	chatBox *ChatBox

	friend    string
	chatInput *textfield.TextField
}

func (h *SaltyChat) init(ctx app.Context) {
	ctx.Page().SetTitle("Salty Chat")
}

func (h *SaltyChat) load(ctx app.Context) {
	ctx.Page().SetTitle("Salty Chat")
	ctx.Page().SetDescription(descText)
}

func (h *SaltyChat) OnPreRender(ctx app.Context) {
	h.init(ctx)
	h.load(ctx)
}

func (h *SaltyChat) OnResize(ctx app.Context) {
	h.ResizeContent()
}

func (h *SaltyChat) OnAppInstallChange(ctx app.Context) {
	h.isAppInstallable = ctx.IsAppInstallable()
}

func (h *SaltyChat) OnNav(ctx app.Context) {
	h.refreshMessages(ctx)
}

func (h *SaltyChat) refreshMessages(ctx app.Context) {

	if ctx.Page().URL().Fragment == "" {
		return
	}

	h.friend = ctx.Page().URL().Fragment
	h.chatBox.User = h.friend
	h.chatBox.UpdateMessages(ctx)

}

func (h *SaltyChat) OnMount(ctx app.Context) {

	h.isAppInstallable = ctx.IsAppInstallable()

	h.refreshMessages(ctx)
	if app.IsClient {
		h.connect(ctx)
	} else {
		log.Println("app not running as a client?")
	}
	ctx.Handle(saltyChatRecvMessageAction, h.incomingMessage)
	ctx.Handle(saltyChatSentMessageAction, h.outgoingMessage)
}

func (h *SaltyChat) connect(ctx app.Context) {
	log.Println("connect()")

	if client != nil {
		log.Println("already have a connected client")
		return
	}
	log.Println("creating new client")

	identity, err := GetIdentityFromState(ctx)
	if err != nil {
		h.dialog.ShowError("missing identity, please configure", err.Error())
		return
	}

	state, err := GetStateFromState(ctx)
	if err != nil {
		log.Errorf("error loading state: %s", err)
		state = saltyim.NewState()
	}

	clientIdentity := saltyim.WithClientIdentity(saltyim.WithIdentityBytes(identity.Contents()))
	newClient, err := saltyim.NewClient(clientIdentity, saltyim.WithState(state))
	if err != nil {
		h.dialog.ShowError("error setting up client", err.Error())
		return
	}
	newClient.SetSend(&saltyim.ProxySend{SendEndpoint: app.Getenv("SendEndpoint")})
	newClient.SetLookup(&saltyim.ProxyLookup{LookupEndpoint: app.Getenv("LookupEndpoint")})

	client = newClient

	ctx.Async(func() {
		stateCh := time.NewTicker(time.Second * 20)
		inboxCh := client.Subscribe(ctx.Dispatcher().Context(), "", "", "")
		outboxCh := client.OutboxClient(nil).Subscribe(ctx.Dispatcher().Context(), "", "", "")

		for {
			select {
			case <-ctx.Done():
				stateCh.Stop()
				return
			case msg := <-inboxCh:
				// passing both the message and the text in case we need the message key at some point
				ctx.NewActionWithValue(saltyChatRecvMessageAction, msg, app.T("text", msg.Text))
			case msg := <-outboxCh:
				// passing both the message and the text in case we need the message key at some point
				ctx.NewActionWithValue(saltyChatSentMessageAction, msg, app.T("text", msg.Text))
			case <-stateCh.C:
				if err := SetStateToState(ctx, client.State()); err != nil {
					log.WithError(err).Warn("error saving state")
				}
			}
		}
	})
}

func (h *SaltyChat) incomingMessage(ctx app.Context, action app.Action) {
	messageText := action.Tags.Get("text")

	s, err := lextwt.ParseSalty(messageText)
	if err != nil {
		h.dialog.ShowError("incoming message error", err.Error())
		return
	}

	switch s := s.(type) {
	case *lextwt.SaltyText:
		user := s.User.String()
		storage.ContactsLocalStorage(ctx).Add(user)
		storage.ConversationsLocalStorage(ctx, user).Append(messageText)
		// only update when incoming user's message is the active chat
		if h.friend == user {
			h.chatBox.UpdateMessages(ctx)
		} else {
			// TODO: Creates some initial content of the new chat
			// to give the user a change to Accept/Reject the contact.
			log.Printf("new incoming chat from %s", user)
		}
	}
}

func (h *SaltyChat) outgoingMessage(ctx app.Context, action app.Action) {
	messageText := action.Tags.Get("text")
	s, err := lextwt.ParseSalty(messageText)
	if err != nil {
		h.dialog.ShowError("outgoing message error", err.Error())
		return
	}

	friend := ""
	switch s := s.(type) {
	case *lextwt.SaltyText:
		friend = s.User.String()
		storage.ContactsLocalStorage(ctx).Add(friend)
		storage.ConversationsLocalStorage(ctx, friend).
			Append(string(saltyim.PackMessageTime(client.Me(), s.LiteralText(), s.Timestamp)))
	}

	// only update when incoming user's message is the active chat
	if h.friend == friend {
		h.chatBox.UpdateMessages(ctx)
	} else {
		// TODO: Creates some initial content of the new chat
		// to give the user a change to Accept/Reject the contact.
		log.Printf("new incoming chat from %s", friend)
	}
}

func (h *SaltyChat) Render() app.UI {

	if h.chatBox == nil {
		h.chatBox = &ChatBox{}
		h.chatInput = &textfield.TextField{Id: "chat-input", Placeholder: "New Message"}
		h.dialog = &ModalDialog{}
	}

	h.chatBox.User = h.friend

	return PageBody(
		app.Div().ID("wrapper").Body(
			h.chatBox,
			app.Form().OnSubmit(h.handleSendMessage).Body(
				h.chatInput,
				icon.MISend.Button().ID("chat-send"),
			),
			h.dialog,
		),
	)

}

func (h *SaltyChat) handleSendMessage(ctx app.Context, e app.Event) {
	e.PreventDefault()
	msg := h.chatInput.Value
	h.chatInput.Value = ""
	h.focusChatInput()

	if msg == "" || h.friend == "" {
		// nothing to send and no friend selected
		log.Printf("no send since msg = %q or Friend = %q", msg, h.friend)
		return
	}

	// determine current user to send message to and use client to send the message
	if client != nil {
		h.chatBox.User = h.friend
		ctx.Async(func() {
			if err := client.Send(h.friend, msg); err != nil {
				h.dialog.ShowError("error sending message", err.Error())
			}
		})
	}

}

func (h *SaltyChat) focusChatInput() {
	chatInputValue := h.JsUtil.JsValueAtPath(h.chatInput.Id + "-input")
	chatInputValue.Set("value", "")
	chatInputValue.Call("focus")
}