From 0aaabff503bac6fa1235a51cda1d0c7dea7978a9 Mon Sep 17 00:00:00 2001
From: surdeus <surdeus@gmail.com>
Date: Wed, 27 Sep 2023 14:09:49 +0300
Subject: [PATCH] Finally implemented at least not stable but working version.

---
 cmd/test/main.go | 178 ++++++++++++++++++++++-------------------------
 tg/beh.go        |  19 +----
 tg/bot.go        |  20 ++++--
 tg/command.go    |  40 +++++------
 tg/compo.go      |  19 ++---
 tg/context.go    |  76 +++++++++++---------
 tg/file.go       |  11 +--
 tg/filter.go     |   6 +-
 tg/inline.go     |   9 +--
 tg/message.go    |   5 +-
 tg/read.go       |  49 -------------
 tg/reply.go      |  12 ++--
 tg/session.go    |  11 +--
 13 files changed, 206 insertions(+), 249 deletions(-)

diff --git a/cmd/test/main.go b/cmd/test/main.go
index 2578832..e24f9eb 100644
--- a/cmd/test/main.go
+++ b/cmd/test/main.go
@@ -7,8 +7,8 @@ import (
 	"fmt"
 
 	"github.com/mojosa-software/got/tg"
-	"math/rand"
-	"strconv"
+	//"math/rand"
+	//"strconv"
 )
 
 type BotData struct {
@@ -20,17 +20,19 @@ type SessionData struct {
 }
 
 type MutateMessageWidget struct {
+	*tg.Compo
 	Mutate func(string) string
 }
 
 func NewMutateMessageWidget(fn func(string) string) *MutateMessageWidget {
 	ret := &MutateMessageWidget{}
+	ret.Compo = tg.NewCompo()
 	ret.Mutate = fn
 	return ret
 }
 
 func (w *MutateMessageWidget) Serve(c *tg.Context) {
-	args, ok := c.Arg.(tg.ArgSlice)
+	args, ok := c.Arg.([]any)
 	if ok {
 		for _, arg := range args {
 			c.Sendf("%v", arg)
@@ -42,7 +44,7 @@ func (w *MutateMessageWidget) Serve(c *tg.Context) {
 	}
 }
 
-func (w *MutateMessageWidget) Filter(u *tg.Update, _ tg.MessageMap) bool {
+func (w *MutateMessageWidget) Filter(u *tg.Update) bool {
 	if u.Message == nil {
 		return true
 	}
@@ -75,8 +77,6 @@ var (
 		backButton,
 	)
 
-	navKeyboard = 
-
 	sendLocationKeyboard = tg.NewKeyboard().Row(
 		tg.NewButton("Send location").
 			WithSendLocation(true).
@@ -103,17 +103,19 @@ WithInitFunc(func(c *tg.Context) {
 	c.Session.Data = &SessionData{}
 }).WithRootNode(tg.NewRootNode(
 	// The "/" widget.
-	tg.WidgetFunc(func(c *tg.Context) tg.UIs {return tg.UIs{
+	tg.RenderFunc(func(c *tg.Context) tg.UI {return tg.UI {
 
 		tg.NewKeyboard().Row(
 				tg.NewButton("GoT Github page").
 					WithUrl("https://github.com/mojosa-software/got"),
-			).Inline().Widget(
+			).Inline().Compo(
 				fmt.Sprintf(
-					"Hello, %s!\n"
-					"The testing bot started!\n",
-					"You can see the basics of usage in the ",
-					"cmd/test/main.go file!",
+					fmt.Sprint(
+						"Hello, %s!\n",
+						"The testing bot started!\n",
+						"You can see the basics of usage in the ",
+						"cmd/test/main.go file!",
+					),
 					c.SentFrom().UserName,
 				),
 			),
@@ -124,72 +126,84 @@ WithInitFunc(func(c *tg.Context) {
 				tg.NewButton("Mutate messages").Go("/mutate-messages"),
 			).Row(
 				tg.NewButton("Send location").Go("/send-location"),
-			).Reply().Widget(
+			).Reply().Compo(
 				"Choose the point of your interest",
 			),
 
 	}}),
 
 	tg.NewNode(
-		"mutate-messages", tg.NewPage().WithReply(
-			tg.NewKeyboard().Row(
-				tg.NewButton("Upper case").Go("upper-case"),
-				tg.NewButton("Lower case").Go("lower-case"),
-			).Row(
-				backButton,
-			).Reply().Widget(
-				"Choose the function to mutate string",
-			),
-		),
+		"mutate-messages", tg.RenderFunc(func(c *tg.Context) tg.UI {
+			return tg.UI{
+				tg.NewKeyboard().Row(
+					tg.NewButton("Upper case").Go("upper-case"),
+					tg.NewButton("Lower case").Go("lower-case"),
+				).Row(
+					backButton,
+				).Reply().Compo(
+					"Choose the function to mutate string",
+				),
+			}
+		}),
 		tg.NewNode(
-			"upper-case", tg.NewPage().WithReply(
-				backKeyboard.Reply().
-					Widget(
-						"Type a string and the bot will convert it to upper case",
-					),
-			).WithSub(
-				NewMutateMessageWidget(strings.ToUpper),
-			),
-		),
-		tg.NewNode(
-			"lower-case", tg.NewPage().WithReply(
-				backKeyboard.Reply().
-					Widget(
-						"Type a string and the bot will convert it to lower case",
-					),
-			).WithSub(
-				NewMutateMessageWidget(strings.ToLower),
-			),
-		),
-	),
-
-	tg.NewNode(
-		"inc-dec", tg.NewPage().WithReply(
-				incDecKeyboard.Reply().Widget("Press the buttons to increment and decrement"),
-			).ActionFunc(func(c *tg.Context) {
-				// The function will be calleb before serving page.
-				d := ExtractSessionData(c)
-				c.Sendf("Current counter value = %d", d.Counter)
+			"upper-case", tg.RenderFunc(func(c *tg.Context) tg.UI {
+				return tg.UI{
+					backKeyboard.Reply().Compo(
+							"Type a string and the bot will convert it to upper case",
+						),
+					NewMutateMessageWidget(strings.ToUpper),
+				}
 			}),
+		),
+		tg.NewNode(
+			"lower-case", tg.RenderFunc(func(c *tg.Context) tg.UI {
+				return tg.UI{
+					backKeyboard.Reply().
+						Compo(
+							"Type a string and the bot will convert it to lower case",
+						),
+					NewMutateMessageWidget(strings.ToLower),
+				}
+			}),
+		),
 	),
 
 	tg.NewNode(
-		"send-location", tg.NewPage().WithReply(
-			sendLocationKeyboard.Widget("Press the button to send your location!"),
-		).WithInline(
-			tg.NewKeyboard().Row(
-				tg.NewButton(
-					"Check",
-				).WithData(
-					"check",
-				).ActionFunc(func(c *tg.Context) {
-					d := ExtractSessionData(c)
-					c.Sendf("Counter = %d", d.Counter)
-				}),
-			).Inline().Widget("Press the button to display your counter"),
-		),
+		"inc-dec", tg.RenderFunc(func(c *tg.Context) tg.UI {
+			d := ExtractSessionData(c)
+			return tg.UI{
+				incDecKeyboard.Reply().Compo(fmt.Sprintf(
+					"Press the buttons to increment and decrement.\n" +
+					"Current counter value = %d", d.Counter,
+				)),
+			}
+		}),
 	),
-)).WithCommands(
+
+	tg.NewNode(
+		"send-location", tg.RenderFunc(func(c *tg.Context) tg.UI {
+			return tg.UI {
+				tg.NewKeyboard().Row(
+					tg.NewButton(
+						"Check",
+					).WithData(
+						"check",
+					).WithAction(tg.Func(func(c *tg.Context) {
+						d := ExtractSessionData(c)
+						c.Sendf("Counter = %d", d.Counter)
+					})),
+				).Inline().Compo("Press the button to display your counter"),
+
+				sendLocationKeyboard.Compo(
+					"Press the button to send your location!",
+				),
+			}
+		}),
+	),
+)).WithRoot(tg.NewCommandCompo().
+WithPreStart(tg.Func(func(c *tg.Context){
+	c.Sendf("Please, use /start ")
+})).WithCommands(
 	tg.NewCommand("info").
 		ActionFunc(func(c *tg.Context){
 			c.SendfHTML(`<a href="https://res.cloudinary.com/demo/image/upload/v1312461204/sample.jpg">cock</a><strong>cock</strong> die`)
@@ -219,37 +233,15 @@ WithInitFunc(func(c *tg.Context) {
 		}),
 	tg.NewCommand("botname").
 		Desc("get the bot name").
-		ActionFunc(func(c *tg.Context) {
+		WithAction(tg.Func(func(c *tg.Context) {
 			bd := c.Bot.Data.(*BotData)
 			c.Sendf("My name is %q", bd.Name)
-		}),
+		})),
 	tg.NewCommand("dynamic").
 		Desc("check of the dynamic work").
-		WidgetFunc(func(c *tg.Context){
-			nRow, nBtn := rand.Int()%10, rand.Int()%5
-			rows := []tg.ButtonRow{}
-			for i:=0 ; i<nRow ; i++ {
-				row := []*tg.Button{}
-				for j:=0 ; j<nBtn ; j++ {
-					row = append(row, tg.NewButton(
-						strconv.Itoa(i) + " " + strconv.Itoa(j),
-					))
-				}
-				rows = append(rows, row)
-			}
-			kbd := tg.NewKeyboard(rows...).ActionFunc(func(c *tg.Context){
-				c.Sendf(u.)
-			})Inline().Widget("sample text")
-			c.Send(kbd)
-			kbdChn := c.RunWidget(kbd)
-			for u := range c.Input() {
-				if kbd.Filter(u, nil) {
-					continue
-				}
-				kbdChn.Send(u)
-			}
-		}),
-)
+		WithWidget(tg.Func(func(c *tg.Context){
+		})),
+	))
 
 var gBeh = tg.NewGroupBehaviour().
 	InitFunc(func(c *tg.GC) {
diff --git a/tg/beh.go b/tg/beh.go
index 067cce5..92702f3 100644
--- a/tg/beh.go
+++ b/tg/beh.go
@@ -5,7 +5,7 @@ package tg
 
 // The type describes behaviour for the bot in personal chats.
 type Behaviour struct {
-	Root Widget
+	Root Component
 	Init      Action
 	Screens   ScreenMap
 }
@@ -17,12 +17,6 @@ func NewBehaviour() *Behaviour {
 	}
 }
 
-// Set the root widget. Mostly the CommandWidget is used.
-func (b *Behaviour) WithRoot(root Widget) *Behaviour {
-	b.Root = root
-	return b
-}
-
 // The Action will be called on session creation,
 // not when starting or restarting the bot with the Start Action.
 func (b *Behaviour) WithInit(a Action) *Behaviour {
@@ -61,15 +55,8 @@ func (b *Behaviour) WithRootNode(node *RootNode) *Behaviour {
 
 // The function sets as the standard root widget CommandWidget
 // and its commands..
-func (b *Behaviour) WithCommands(cmds ...*Command) *Behaviour {
-	b.Root = NewCommandWidget().
-		WithCommands(cmds...).
-		WithPreStartFunc(func(c *Context){
-			c.Sendf("Please, use the /start command to start")
-		}).WithUsageFunc(func(c *Context){
-			c.Sendf("No such command")
-		})
-
+func (b *Behaviour) WithRoot(root Component) *Behaviour {
+	b.Root = root
 	return b
 }
 
diff --git a/tg/bot.go b/tg/bot.go
index f7c20c7..b2a804c 100644
--- a/tg/bot.go
+++ b/tg/bot.go
@@ -39,6 +39,7 @@ func NewBot(token string) (*Bot, error) {
 
 	return &Bot{
 		Api: bot,
+		contexts: make(map[SessionId] *context),
 	}, nil
 }
 
@@ -50,14 +51,18 @@ func (bot *Bot) Debug(debug bool) *Bot {
 // Send the Renderable to the specified session client side.
 // Can be used for both group and private sessions.
 func (bot *Bot) Send(
-	sid SessionId, v Sendable,
+	sid SessionId, v Sendable, args ...any,
 ) (*Message, error) {
-	c, ok := bot.contexts[sid]
+	ctx, ok := bot.contexts[sid]
 	if !ok {
 		return nil, ContextNotExistErr
 	}
 
-	config  := v.Render(sid, bot)
+	c := &Context{
+		context: ctx,
+	}
+
+	config := v.SendConfig(c.WithArg(c.MakeArg(args)))
 	if config.Error != nil {
 		return nil, config.Error
 	}
@@ -220,18 +225,19 @@ func (bot *Bot) handlePrivate(updates chan *Update) {
 		sid = SessionId(u.FromChat().ID)
 		ctx, ctxOk := bot.contexts[sid]
 		 if u.Message != nil && !ctxOk {
-			// Create context on any message
-			// if we have no one.
+
 			session, sessionOk := bot.sessions[sid]
 			if !sessionOk {
 				// Creating session if we have none.
-				session = bot.sessions.Add(sid)
+				session = bot.sessions.Add(sid, PrivateSessionScope)
 			}
 			session = bot.sessions[sid]
+
+			// Create context on any message
+			// if we have no one.
 			ctx = &context{
 				Bot:     bot,
 				Session: session,
-				scope: PrivateContextScope,
 				updates: NewUpdateChan(),
 			}
 			 if !ctxOk {
diff --git a/tg/command.go b/tg/command.go
index 9730798..1fd1c45 100644
--- a/tg/command.go
+++ b/tg/command.go
@@ -100,21 +100,21 @@ func (c *GroupCommand) ToApi() tgbotapi.BotCommand {
 
 // The type is used to recognize commands and execute
 // its actions and widgets .
-type CommandWidget struct {
+type CommandCompo struct {
 	PreStart Action
 	Commands  CommandMap
 	Usage Action
 }
 
-// Returns new empty CommandWidget.
-func NewCommandWidget() *CommandWidget {
-	ret := &CommandWidget{}
+// Returns new empty CommandCompo.
+func NewCommandCompo() *CommandCompo {
+	ret := &CommandCompo{}
 	ret.Commands = make(CommandMap)
 	return ret
 }
 
 // Set the commands to handle.
-func (w *CommandWidget) WithCommands(cmds ...*Command) *CommandWidget {
+func (w *CommandCompo) WithCommands(cmds ...*Command) *CommandCompo {
 	for _, cmd := range cmds {
 		if cmd.Name == "" {
 			panic("empty command name")
@@ -129,41 +129,41 @@ func (w *CommandWidget) WithCommands(cmds ...*Command) *CommandWidget {
 }
 
 // Set the prestart action.
-func (w *CommandWidget) WithPreStart(a Action) *CommandWidget {
+func (w *CommandCompo) WithPreStart(a Action) *CommandCompo {
 	w.PreStart = a
 	return w
 }
 
 // Set the prestart action with function.
-func (w *CommandWidget) WithPreStartFunc(fn ActionFunc) *CommandWidget {
+func (w *CommandCompo) WithPreStartFunc(fn ActionFunc) *CommandCompo {
 	return w.WithPreStart(fn)
 }
 
 // Set the usage action.
-func (w *CommandWidget) WithUsage(a Action) *CommandWidget {
+func (w *CommandCompo) WithUsage(a Action) *CommandCompo {
 	w.Usage = a
 	return w
 }
 
 // Set the usage action with function.
-func (w *CommandWidget) WithUsageFunc(fn ActionFunc) *CommandWidget {
+func (w *CommandCompo) WithUsageFunc(fn ActionFunc) *CommandCompo {
 	return w.WithUsage(fn)
 }
 
-func (widget *CommandWidget) Filter(
+func (widget *CommandCompo) Filter(
 	u *Update,
-	msgs ...*Message,
 ) bool {
-	/*if u.Message == nil || !u.Message.IsCommand() {
+	if u.Message == nil || !u.Message.IsCommand() {
 		return false
-	}*/
+	}
 
 	return false
 }
 
-func (widget *CommandWidget) Serve(c *Context) {
+// Implementing server.
+func (compo *CommandCompo) Serve(c *Context) {
 	commanders := make(map[CommandName] BotCommander)
-	for k, v := range widget.Commands {
+	for k, v := range compo.Commands {
 		commanders[k] = v
 	}
 	c.Bot.SetCommands(
@@ -178,7 +178,7 @@ func (widget *CommandWidget) Serve(c *Context) {
 			// while we have the empty screen.
 			// E. g. the session did not start.
 			if !(u.Message.IsCommand() && u.Message.Command() == "start") {
-				c.Run(widget.PreStart, u)
+				c.WithUpdate(u).Run(compo.PreStart)
 				continue
 			}
 		}
@@ -186,16 +186,16 @@ func (widget *CommandWidget) Serve(c *Context) {
 		if u.Message != nil && u.Message.IsCommand() {
 			// Command handling.
 			cmdName := CommandName(u.Message.Command())
-			cmd, ok := widget.Commands[cmdName]
+			cmd, ok := compo.Commands[cmdName]
 			if !ok {
-				c.Run(widget.Usage, u)
+				c.WithUpdate(u).Run(compo.Usage)
 				continue
 			}
 
-			c.Run(cmd.Action, u)
+			c.WithUpdate(u).Run(cmd.Action)
 			if cmd.Widget != nil {
 				cmdUpdates.Close()
-				cmdUpdates = c.runWidget(cmd.Widget)
+				cmdUpdates = c.WithUpdate(u).RunWidget(cmd.Widget)
 			}
 			continue
 		}
diff --git a/tg/compo.go b/tg/compo.go
index 4820b5d..e54c86b 100644
--- a/tg/compo.go
+++ b/tg/compo.go
@@ -9,7 +9,7 @@ type Widget interface {
 
 // The way to describe custom function based Widgets.
 type RenderFunc func(c *Context) UI
-func (fn RenderFunc) Uis(c *Context) UI {
+func (fn RenderFunc) Render(c *Context) UI {
 	return fn(c)
 }
 
@@ -30,15 +30,18 @@ type Component interface {
 }
 
 // The type to embed into potential components.
-// Implements empty versions of interfaces
-// and contains 
+// Implements empty versions of interfaces.
 type Compo struct{
 	*Message
 }
 
-// Defalut setting message 
-func (compo Compo) SetMessage(msg *Message) { compo.Message = msg }
-func (compo Compo) GetMessage() *Message { return compo.Message }
-// Default non filtering filter. Always returns false.
-func (compo Compo) Filter(_ *Update, _ *Message) bool {return false}
+func NewCompo() *Compo {
+	return &Compo{}
+}
+
+// Defalut setting message 
+func (compo *Compo) SetMessage(msg *Message) { compo.Message = msg }
+func (compo *Compo) GetMessage() *Message { return compo.Message }
+// Default non filtering filter. Always returns false.
+func (compo *Compo) Filter(_ *Update) bool {return false}
 
diff --git a/tg/context.go b/tg/context.go
index f8d1078..d814b6d 100644
--- a/tg/context.go
+++ b/tg/context.go
@@ -16,7 +16,7 @@ func (f Func) Act(c *Context) {
 func (f Func) Serve(c *Context) {
 	f(c)
 }
-func(f Func) Filter(_ *Context) bool {
+func(f Func) Filter(_ *Update) bool {
 	return false
 }
 func (f Func) Render(_ *Context) UI {
@@ -68,7 +68,7 @@ func (c *Context) PrevPath() Path {
 
 func (c *Context) Run(a Action) {
 	if a != nil {
-		a.Act(c.Copy().WithUpdate(u))
+		a.Act(c)
 	}
 }
 
@@ -186,52 +186,62 @@ func (c *Context) PathExist(pth Path) bool {
 	return c.Bot.behaviour.PathExist(pth)
 }
 
-// Run widget in background returning the new input channel for it.
-func (c *Context) runWidget(widget Widget, args ...any) *UpdateChan {
-	if widget == nil {
-		return nil
-	}
-
+func (c *Context) MakeArg(args []any) any {
 	var arg any
 	if len(args) == 1 {
 		arg = args[0]
 	} else if len(args) > 1 {
 		arg = args
 	}
+	return arg
+}
+
+func (c *Context) RunCompo(compo Component, args ...any) *UpdateChan {
+	s, ok := compo.(Sendable)
+	if ok {
+		msg, err := c.Send(s)
+		if err != nil {
+			panic("could not send the message")
+		}
+		s.SetMessage(msg)
+	}
+	updates := NewUpdateChan()
+	go func() {
+		compo.Serve(
+			c.WithInput(updates).
+				WithArg(c.MakeArg(args)),
+		)
+		// To let widgets finish themselves before
+		// the channel is closed and close it by themselves.
+		updates.Close()
+	}()
+	return updates
+}
+
+// Run widget in background returning the new input channel for it.
+func (c *Context) RunWidget(widget Widget, args ...any) *UpdateChan {
+	if widget == nil {
+		return nil
+	}
 
 	pth := c.Path()
-	uis := widget.UI()
+	compos := widget.Render(c.WithArg(c.MakeArg(args)))
 	// Leave if changed path.
 	if pth != c.Path() {
 		return nil
 	}
-	chns := make(map[UI] *UpdateChan)
-	for _, ui := range uis {
-		s, ok := ui.(Sendable)
-		if ok {
-			msg := c.Send(s.SendConfig(c))
-			ui.SetMessage(msg)
-		}
-		updates := NewUpdateChan()
-		go func() {
-			ui.Serve(
-				c.Copy().
-					WithInput(updates).
-					WithArg(arg),
-			)
-			// To let widgets finish themselves before
-			// the channel is closed and close it by themselves.
-			updates.Close()
-		}()
-		chns[ui] = updates
+	chns := make([]*UpdateChan, len(compos))
+	for i, compo := range compos {
+		chns[i] = c.RunCompo(compo)
 	}
 
 	ret := NewUpdateChan()
 	go func() {
-		for u := range ret {
-			for ui := range uis {
-				if !ui.Filter() {
-					chns[ui] <- u
+		for u := range ret.Chan() {
+			for i, compo := range compos {
+				chn := chns[i]
+				if !compo.Filter(u) {
+					chn.Send(u)
 				}
 			}
 		}
@@ -239,7 +249,7 @@ func (c *Context) runWidget(widget Widget, args ...any) *UpdateChan {
 		for _, chn := range chns {
 			chn.Close()
 		}
-	}
+	}()
 
 	return ret
 }
diff --git a/tg/file.go b/tg/file.go
index 9ea91ef..e0d8e1d 100644
--- a/tg/file.go
+++ b/tg/file.go
@@ -23,15 +23,18 @@ var (
 )
 
 type File struct {
+	*Compo
 	path    string
 	typ     FileType
 	caption string
 }
 
 func NewFile(path string) *File {
-	return &File{
+	ret := &File{
 		path: path,
 	}
+	ret.Compo = NewCompo()
+	return ret
 }
 
 func (f *File) withType(typ FileType) *File {
@@ -73,14 +76,14 @@ func (f *File) SendData() string {
 	return ""
 }
 func (f *File) SendConfig(
-	sid SessionId, bot *Bot,
+	c *Context,
 ) (*SendConfig) {
 	var config SendConfig
-	cid := sid.ToApi()
+	sid := c.Session.Id.ToApi()
 
 	switch f.Type() {
 	case ImageFileType:
-		photo := tgbotapi.NewPhoto(cid, f)
+		photo := tgbotapi.NewPhoto(sid, f)
 		photo.Caption = f.caption
 
 		config.Image = &photo
diff --git a/tg/filter.go b/tg/filter.go
index e0b51aa..cafe364 100644
--- a/tg/filter.go
+++ b/tg/filter.go
@@ -10,9 +10,9 @@ type Filterer interface {
 	Filter(*Update) bool
 }
 
-type FilterFunc func(*Update, MessageMap) bool
+type FilterFunc func(*Update) bool
 func (f FilterFunc) Filter(
-	u *Update, msgs MessageMap,
+	u *Update,
 ) bool {
-	return f(u, msgs)
+	return f(u)
 }
diff --git a/tg/inline.go b/tg/inline.go
index 3759a2f..1cbfb9a 100644
--- a/tg/inline.go
+++ b/tg/inline.go
@@ -25,15 +25,16 @@ func (kbd *Inline) ToApi() tgbotapi.InlineKeyboardMarkup {
 
 // Transform the keyboard to widget with the specified text.
 func (kbd *Inline) Compo(text string) *InlineCompo {
-	ret := &InlinCompo{}
+	ret := &InlineCompo{}
 	ret.Inline = kbd
 	ret.Text = text
+	ret.Compo = NewCompo()
 	return ret
 }
 
 // The type implements message with an inline keyboard.
 type InlineCompo struct {
-	Compo
+	*Compo
 	Text string
 	*Inline
 }
@@ -87,13 +88,13 @@ func (widget *InlineCompo) Serve(c *Context) {
 		} else if widget.Action != nil {
 			act = widget.Action
 		}
-		c.Run(act, u)
+		c.WithUpdate(u).Run(act)
 	}
 }
 
 // Implementing the Filterer interface.
 func (compo *InlineCompo) Filter(u *Update) bool {
-	if widget == nil || u.CallbackQuery == nil {
+	if compo == nil || u.CallbackQuery == nil {
 		return true
 	}
 
diff --git a/tg/message.go b/tg/message.go
index 206fa3c..10dcbb8 100644
--- a/tg/message.go
+++ b/tg/message.go
@@ -6,6 +6,7 @@ import (
 
 // Simple text message type.
 type MessageConfig struct {
+	Compo
 	ParseMode string
 	Text string
 }
@@ -38,10 +39,10 @@ func (msg *MessageConfig) HTML() *MessageConfig {
 }
 
 func (config *MessageConfig) SendConfig(
-	sid SessionId, bot *Bot,
+	c *Context,
 ) (*SendConfig) {
 	var ret SendConfig
-	msg := tgbotapi.NewMessage(sid.ToApi(), config.Text)
+	msg := tgbotapi.NewMessage(c.Session.Id.ToApi(), config.Text)
 	ret.Message = &msg
 	ret.Message.ParseMode = config.ParseMode
 	return &ret
diff --git a/tg/read.go b/tg/read.go
index e221646..77cfbc1 100644
--- a/tg/read.go
+++ b/tg/read.go
@@ -1,52 +1,3 @@
 package tg
 
-// The type to descsribe one line reading widget.
-type UpdateRead struct {
-	Pre Action
-	Filterer Filterer
-	Post Widget
-}
-
-func (rd *UpdateRead) Filter(u *Update, msgs MessageMap) bool {
-	if rd.Filterer != nil {
-		return rd.Filterer.Filter(u, msgs)
-	}
-
-	return false
-}
-
-// Returns new empty update reader.
-func NewUpdateRead(filter Filterer, post Widget) *UpdateRead {
-	ret := &UpdateRead{}
-	ret.Filterer = filter
-	ret.Post = post
-	return ret
-}
-
-func (rd *UpdateRead) WithPre(a Action) *UpdateRead {
-	rd.Pre = a
-	return rd
-}
-
-func NewTextMessageRead(pre Action, post Widget) *UpdateRead {
-	ret := NewUpdateRead(
-		FilterFunc(func(u *Update, _ MessageMap) bool {
-			return u.Message == nil
-		}),
-		post,
-	).WithPre(pre)
-	return ret
-}
-
-func (rd *UpdateRead) Serve(c *Context) {
-	c.Run(rd.Pre, c.Update)
-	for u := range c.Input() {
-		if rd.Filter(u, nil) {
-			continue
-		}
-		c.RunWidget(rd.Post, u)
-		break
-	}
-}
-
 
diff --git a/tg/reply.go b/tg/reply.go
index 3dc7467..7727dde 100644
--- a/tg/reply.go
+++ b/tg/reply.go
@@ -55,17 +55,19 @@ func (kbd *Reply) Compo(text string) *ReplyCompo {
 	ret := &ReplyCompo{}
 	ret.Reply = kbd
 	ret.Text = text
+	ret.Compo = NewCompo()
 	return ret
 }
 
 // The type implements reply keyboard widget.
 type ReplyCompo struct {
+	*Compo
 	Text string
 	*Reply
 }
 
 // Implementing the sendable interface.
-func (compo *ReplyCompo) Render(
+func (compo *ReplyCompo) SendConfig(
 	c *Context,
 ) (*SendConfig) {
 	sid := c.Session.Id.ToApi()
@@ -98,10 +100,10 @@ func (compo *ReplyCompo) Filter(
 		return true
 	}
 
-	_, ok := widget.ButtonMap()[u.Message.Text]
+	_, ok := compo.ButtonMap()[u.Message.Text]
 	if !ok {
 		if u.Message.Location != nil {
-			locBtn := widget.ButtonMap().LocationButton()
+			locBtn := compo.ButtonMap().LocationButton()
 			if locBtn == nil {
 				return true
 			}
@@ -117,7 +119,7 @@ func (compo *ReplyCompo) Serve(c *Context) {
 	for u := range c.Input() {
 		var btn *Button
 		text := u.Message.Text
-		btns := widget.ButtonMap()
+		btns := compo.ButtonMap()
 
 		btn, ok := btns[text]
 		if !ok {
@@ -127,7 +129,7 @@ func (compo *ReplyCompo) Serve(c *Context) {
 		}
 
 		if btn != nil {
-			c.Run(btn.Action, u)
+			c.WithUpdate(u).Run(btn.Action)
 		}
 	}
 }
diff --git a/tg/session.go b/tg/session.go
index bfdb8f4..2ffa67d 100644
--- a/tg/session.go
+++ b/tg/session.go
@@ -4,7 +4,7 @@ package tg
 // related to.
 type SessionScope uint8
 const (
-	NoSessionScope ContextScope = iota
+	NoSessionScope SessionScope = iota
 	PrivateSessionScope
 	GroupSessionScope
 	ChannelSessionScope
@@ -30,9 +30,10 @@ type Session struct {
 }
 
 // Return new empty session with specified user ID.
-func NewSession(id SessionId) *Session {
+func NewSession(id SessionId, scope SessionScope) *Session {
 	return &Session{
 		Id: id,
+		Scope: scope,
 	}
 }
 
@@ -41,9 +42,9 @@ func NewSession(id SessionId) *Session {
 type SessionMap map[SessionId]*Session
 
 // Add new empty session by it's ID.
-func (sm SessionMap) Add(sid SessionId) *Session {
-	ret := NewSession(sid)
-	sm[sid] = NewSession(sid)
+func (sm SessionMap) Add(sid SessionId, scope SessionScope) *Session {
+	ret := NewSession(sid, scope)
+	sm[sid] = ret
 	return ret
 }