Refactor UI to use interfaces everywhere

21 files changed, 630 insertions, 588 deletions

diff --git a/config/config.go b/config/config.go
index 4ad6793..9179a58 100644
--- a/config/config.go
+++ b/config/config.go
@@ -23,7 +23,7 @@ import (
 	"path/filepath"
 
 	"gopkg.in/yaml.v2"
-	"maunium.net/go/gomuks/ui/debug"
+	"maunium.net/go/gomuks/debug"
 )
 
 // Config contains the main config of gomuks.
diff --git a/config/session.go b/config/session.go
index 337a14b..d12bc20 100644
--- a/config/session.go
+++ b/config/session.go
@@ -24,7 +24,7 @@ import (
 	"maunium.net/go/gomatrix"
 	"maunium.net/go/gomuks/matrix/pushrules"
 	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/ui/debug"
+	"maunium.net/go/gomuks/debug"
 )
 
 type Session struct {
diff --git a/ui/debug/debug.go b/debug/debug.go
index 3f47980..9af3d9d 100644
--- a/ui/debug/debug.go
+++ b/debug/debug.go
@@ -18,104 +18,43 @@ package debug
 
 import (
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
 	"time"
 
 	"runtime/debug"
 
-	"maunium.net/go/tview"
 )
 
-type Printer interface {
-	Printf(text string, args ...interface{})
-	Print(text ...interface{})
-}
-
-type Pane struct {
-	*tview.TextView
-	Height int
-	Width  int
-	num    int
-}
-
-var Default Printer
-var RedirectAllExt bool
-
-func NewPane() *Pane {
-	pane := tview.NewTextView()
-	pane.
-		SetScrollable(true).
-		SetWrap(true).
-		SetBorder(true).
-		SetTitle("Debug output")
-	fmt.Fprintln(pane, "[0] Debug pane initialized")
+var writer io.Writer
 
-	return &Pane{
-		TextView: pane,
-		Height:   35,
-		Width:    80,
-		num:      0,
+func init() {
+	var err error
+	writer, err = os.OpenFile("/tmp/gomuks-debug.log", os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
+	if err != nil {
+		writer = nil
 	}
 }
 
-func (db *Pane) Printf(text string, args ...interface{}) {
-	db.WriteString(fmt.Sprintf(text, args...) + "\n")
-}
-
-func (db *Pane) Print(text ...interface{}) {
-	db.WriteString(fmt.Sprintln(text...))
-}
-
-func (db *Pane) WriteString(text string) {
-	db.num++
-	fmt.Fprintf(db, "[%d] %s", db.num, text)
-}
-
-type PaneSide int
-
-const (
-	Top PaneSide = iota
-	Bottom
-	Left
-	Right
-)
-
-func (db *Pane) Wrap(main tview.Primitive, side PaneSide) tview.Primitive {
-	rows, columns := []int{0}, []int{0}
-	mainRow, mainColumn, paneRow, paneColumn := 0, 0, 0, 0
-	switch side {
-	case Top:
-		rows = []int{db.Height, 0}
-		mainRow = 1
-	case Bottom:
-		rows = []int{0, db.Height}
-		paneRow = 1
-	case Left:
-		columns = []int{db.Width, 0}
-		mainColumn = 1
-	case Right:
-		columns = []int{0, db.Width}
-		paneColumn = 1
+func Printf(text string, args ...interface{}) {
+	if writer != nil {
+		fmt.Fprintf(writer, time.Now().Format("[2006-01-02 15:04:05] "))
+		fmt.Fprintf(writer, text+"\n", args...)
 	}
-	return tview.NewGrid().SetRows(rows...).SetColumns(columns...).
-		AddItem(main, mainRow, mainColumn, 1, 1, 1, 1, true).
-		AddItem(db, paneRow, paneColumn, 1, 1, 1, 1, false)
 }
 
-func Printf(text string, args ...interface{}) {
-	if RedirectAllExt {
-		ExtPrintf(text, args...)
-	} else if Default != nil {
-		Default.Printf(text, args...)
+func Print(text ...interface{}) {
+	if writer != nil {
+		fmt.Fprintf(writer, time.Now().Format("[2006-01-02 15:04:05] "))
+		fmt.Fprintln(writer, text...)
 	}
 }
 
-func Print(text ...interface{}) {
-	if RedirectAllExt {
-		ExtPrint(text...)
-	} else if Default != nil {
-		Default.Print(text...)
+func PrintStack() {
+	if writer != nil {
+		data := debug.Stack()
+		writer.Write(data)
 	}
 }
 
diff --git a/debug/doc.go b/debug/doc.go
new file mode 100644
index 0000000..253441c
--- /dev/null
+++ b/debug/doc.go
@@ -0,0 +1,2 @@
+// Package debug contains utilities to log debug messages and display panics nicely.
+package debug
diff --git a/gomuks.go b/gomuks.go
index 60a4d2b..5edae3a 100644
--- a/gomuks.go
+++ b/gomuks.go
@@ -23,10 +23,10 @@ import (
 	"time"
 
 	"maunium.net/go/gomuks/config"
+	"maunium.net/go/gomuks/debug"
 	"maunium.net/go/gomuks/interface"
 	"maunium.net/go/gomuks/matrix"
 	"maunium.net/go/gomuks/ui"
-	"maunium.net/go/gomuks/ui/debug"
 	"maunium.net/go/tview"
 )
 
@@ -35,7 +35,6 @@ type Gomuks struct {
 	app       *tview.Application
 	ui        *ui.GomuksUI
 	matrix    *matrix.Container
-	debug     *debug.Pane
 	debugMode bool
 	config    *config.Config
 	stop      chan bool
@@ -43,19 +42,14 @@ type Gomuks struct {
 
 // NewGomuks creates a new Gomuks instance with everything initialized,
 // but does not start it.
-func NewGomuks(enableDebug, forceExternalDebug bool) *Gomuks {
+func NewGomuks(enableDebug bool) *Gomuks {
 	configDir := filepath.Join(os.Getenv("HOME"), ".config/gomuks")
 	gmx := &Gomuks{
-		app:  tview.NewApplication(),
-		stop: make(chan bool, 1),
+		app:       tview.NewApplication(),
+		stop:      make(chan bool, 1),
+		debugMode: enableDebug,
 	}
 
-	gmx.debug = debug.NewPane()
-	gmx.debug.SetChangedFunc(func() {
-		gmx.ui.Render()
-	})
-	debug.Default = gmx.debug
-
 	gmx.config = config.NewConfig(configDir)
 	gmx.ui = ui.NewGomuksUI(gmx)
 	gmx.matrix = matrix.NewContainer(gmx)
@@ -68,15 +62,6 @@ func NewGomuks(enableDebug, forceExternalDebug bool) *Gomuks {
 	_ = gmx.matrix.InitClient()
 
 	main := gmx.ui.InitViews()
-	if enableDebug {
-		debug.EnableExternal()
-		if forceExternalDebug {
-			debug.RedirectAllExt = true
-		} else {
-			main = gmx.debug.Wrap(main, debug.Right)
-		}
-		gmx.debugMode = true
-	}
 	gmx.app.SetRoot(main, true)
 
 	return gmx
@@ -85,10 +70,10 @@ func NewGomuks(enableDebug, forceExternalDebug bool) *Gomuks {
 // Save saves the active session and message history.
 func (gmx *Gomuks) Save() {
 	if gmx.config.Session != nil {
-		gmx.debug.Print("Saving session...")
+		debug.Print("Saving session...")
 		_ = gmx.config.Session.Save()
 	}
-	gmx.debug.Print("Saving history...")
+	debug.Print("Saving history...")
 	gmx.ui.MainView().SaveAllHistory()
 }
 
@@ -112,9 +97,9 @@ func (gmx *Gomuks) StartAutosave() {
 // Stop stops the Matrix syncer, the tview app and the autosave goroutine,
 // then saves everything and calls os.Exit(0).
 func (gmx *Gomuks) Stop() {
-	gmx.debug.Print("Disconnecting from Matrix...")
+	debug.Print("Disconnecting from Matrix...")
 	gmx.matrix.Stop()
-	gmx.debug.Print("Cleaning up UI...")
+	debug.Print("Cleaning up UI...")
 	gmx.app.Stop()
 	gmx.stop <- true
 	gmx.Save()
@@ -170,8 +155,8 @@ func (gmx *Gomuks) UI() ifc.GomuksUI {
 }
 
 func main() {
-	debugVar := os.Getenv("DEBUG")
-	NewGomuks(len(debugVar) > 0, debugVar == "ext").Start()
+	enableDebug := len(os.Getenv("DEBUG")) > 0
+	NewGomuks(enableDebug).Start()
 
 	// We use os.Exit() everywhere, so exiting by returning from Start() shouldn't happen.
 	time.Sleep(5 * time.Second)
diff --git a/interface/ui.go b/interface/ui.go
index c0ddf53..0ddbde7 100644
--- a/interface/ui.go
+++ b/interface/ui.go
@@ -17,11 +17,12 @@
 package ifc
 
 import (
+	"time"
+
+	"github.com/gdamore/tcell"
 	"maunium.net/go/gomatrix"
 	"maunium.net/go/gomuks/matrix/pushrules"
 	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/ui/types"
-	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )
 
@@ -42,7 +43,7 @@ type GomuksUI interface {
 }
 
 type MainView interface {
-	GetRoom(roomID string) *widget.RoomView
+	GetRoom(roomID string) RoomView
 	HasRoom(roomID string) bool
 	AddRoom(roomID string)
 	RemoveRoom(roomID string)
@@ -50,11 +51,75 @@ type MainView interface {
 	SaveAllHistory()
 
 	SetTyping(roomID string, users []string)
-	AddServiceMessage(roomID *widget.RoomView, message string)
-	ProcessMessageEvent(roomView *widget.RoomView, evt *gomatrix.Event) *types.Message
-	ProcessMembershipEvent(roomView *widget.RoomView, evt *gomatrix.Event) *types.Message
-	NotifyMessage(room *rooms.Room, message *types.Message, should pushrules.PushActionArrayShould)
+	ProcessMessageEvent(roomView RoomView, evt *gomatrix.Event) Message
+	ProcessMembershipEvent(roomView RoomView, evt *gomatrix.Event) Message
+	NotifyMessage(room *rooms.Room, message Message, should pushrules.PushActionArrayShould)
 }
 
 type LoginView interface {
 }
+
+type MessageDirection int
+
+const (
+	AppendMessage  MessageDirection = iota
+	PrependMessage
+	IgnoreMessage
+)
+
+type RoomView interface {
+	MxRoom() *rooms.Room
+	SaveHistory(dir string) error
+	LoadHistory(dir string) (int, error)
+
+	SetStatus(status string)
+	SetTyping(users []string)
+	UpdateUserList()
+
+	NewMessage(id, sender, msgtype, text string, timestamp time.Time) Message
+	NewTempMessage(msgtype, text string) Message
+	AddMessage(message Message, direction MessageDirection)
+	AddServiceMessage(message string)
+}
+
+type MessageMeta interface {
+	Sender() string
+	SenderColor() tcell.Color
+	TextColor() tcell.Color
+	TimestampColor() tcell.Color
+	Timestamp() string
+	Date() string
+	CopyFrom(from MessageMeta)
+}
+
+// MessageState is an enum to specify if a Message is being sent, failed to send or was successfully sent.
+type MessageState int
+
+// Allowed MessageStates.
+const (
+	MessageStateSending MessageState = iota
+	MessageStateDefault
+	MessageStateFailed
+)
+
+type Message interface {
+	MessageMeta
+
+	SetIsHighlight(isHighlight bool)
+	IsHighlight() bool
+
+	SetIsService(isService bool)
+	IsService() bool
+
+	SetID(id string)
+	ID() string
+
+	SetType(msgtype string)
+	Type() string
+
+	SetText(text string)
+	Text() string
+
+	SetState(state MessageState)
+	State() MessageState
+}
diff --git a/matrix/matrix.go b/matrix/matrix.go
index 7391ca0..6fff6d8 100644
--- a/matrix/matrix.go
+++ b/matrix/matrix.go
@@ -22,13 +22,14 @@ import (
 	"strings"
 	"time"
 
-	"maunium.net/go/gomatrix"
-	"maunium.net/go/gomuks/config"
-	"maunium.net/go/gomuks/interface"
-	"maunium.net/go/gomuks/matrix/pushrules"
-	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/ui/debug"
-	"maunium.net/go/gomuks/ui/widget"
+
+"maunium.net/go/gomatrix"
+"maunium.net/go/gomuks/config"
+"maunium.net/go/gomuks/debug"
+"maunium.net/go/gomuks/interface"
+"maunium.net/go/gomuks/matrix/pushrules"
+"maunium.net/go/gomuks/matrix/rooms"
+
 )
 
 // Container is a wrapper for a gomatrix Client and some other stuff.
@@ -224,10 +225,10 @@ func (c *Container) HandleMessage(evt *gomatrix.Event) {
 	message := mainView.ProcessMessageEvent(roomView, evt)
 	if message != nil {
 		if c.syncer.FirstSyncDone {
-			pushRules := c.PushRules().GetActions(roomView.Room, evt).Should()
-			mainView.NotifyMessage(roomView.Room, message, pushRules)
+			pushRules := c.PushRules().GetActions(roomView.MxRoom(), evt).Should()
+			mainView.NotifyMessage(roomView.MxRoom(), message, pushRules)
 		}
-		roomView.AddMessage(message, widget.AppendMessage)
+		roomView.AddMessage(message, ifc.AppendMessage)
 		c.ui.Render()
 	}
 }
@@ -255,8 +256,7 @@ func (c *Container) processOwnMembershipChange(evt *gomatrix.Event) {
 	if evt.Unsigned.PrevContent != nil {
 		prevMembership, _ = evt.Unsigned.PrevContent["membership"].(string)
 	}
-	const Hour = 1 * 60 * 60 * 1000
-	if membership == prevMembership || evt.Unsigned.Age > Hour {
+	if membership == prevMembership {
 		return
 	}
 	switch membership {
@@ -282,15 +282,15 @@ func (c *Container) HandleMembership(evt *gomatrix.Event) {
 	message := mainView.ProcessMembershipEvent(roomView, evt)
 	if message != nil {
 		// TODO this shouldn't be necessary
-		roomView.Room.UpdateState(evt)
+		roomView.MxRoom().UpdateState(evt)
 		// TODO This should probably also be in a different place
 		roomView.UpdateUserList()
 
 		if c.syncer.FirstSyncDone {
-			pushRules := c.PushRules().GetActions(roomView.Room, evt).Should()
-			mainView.NotifyMessage(roomView.Room, message, pushRules)
+			pushRules := c.PushRules().GetActions(roomView.MxRoom(), evt).Should()
+			mainView.NotifyMessage(roomView.MxRoom(), message, pushRules)
 		}
-		roomView.AddMessage(message, widget.AppendMessage)
+		roomView.AddMessage(message, ifc.AppendMessage)
 		c.ui.Render()
 	}
 }
diff --git a/ui/debug/doc.go b/ui/debug/doc.go
deleted file mode 100644
index a321689..0000000
--- a/ui/debug/doc.go
+++ /dev/null
@@ -1,2 +0,0 @@
-// Package debug contains utilities to display debug messages while running an interactive tview program.
-package debug
diff --git a/ui/widget/message-view.go b/ui/message-view.go
index f0bdbad..f9d477b 100644
--- a/ui/widget/message-view.go
+++ b/ui/message-view.go
@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package widget
+package ui
 
 import (
 	"encoding/gob"
@@ -24,8 +24,10 @@ import (
 	"time"
 
 	"github.com/gdamore/tcell"
-	"maunium.net/go/gomuks/ui/debug"
-	"maunium.net/go/gomuks/ui/types"
+	"maunium.net/go/gomuks/debug"
+	"maunium.net/go/gomuks/interface"
+	"maunium.net/go/gomuks/ui/messages"
+	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )
 
@@ -44,11 +46,11 @@ type MessageView struct {
 	prevHeight   int
 	prevMsgCount int
 
-	messageIDs map[string]*types.Message
-	messages   []*types.Message
+	messageIDs map[string]messages.UIMessage
+	messages   []messages.UIMessage
 
 	textBuffer []string
-	metaBuffer []types.MessageMeta
+	metaBuffer []ifc.MessageMeta
 }
 
 func NewMessageView() *MessageView {
@@ -60,10 +62,10 @@ func NewMessageView() *MessageView {
 		TimestampWidth:  8,
 		ScrollOffset:    0,
 
-		messages:   make([]*types.Message, 0),
-		messageIDs: make(map[string]*types.Message),
+		messages:   make([]messages.UIMessage, 0),
+		messageIDs: make(map[string]messages.UIMessage),
 		textBuffer: make([]string, 0),
-		metaBuffer: make([]types.MessageMeta, 0),
+		metaBuffer: make([]ifc.MessageMeta, 0),
 
 		widestSender: 5,
 		prevWidth:    -1,
@@ -72,11 +74,11 @@ func NewMessageView() *MessageView {
 	}
 }
 
-func (view *MessageView) NewMessage(id, sender, msgtype, text string, timestamp time.Time) *types.Message {
-	return types.NewMessage(id, sender, msgtype, text,
+func (view *MessageView) NewMessage(id, sender, msgtype, text string, timestamp time.Time) messages.UIMessage {
+	return messages.NewMessage(id, sender, msgtype, text,
 		timestamp.Format(view.TimestampFormat),
 		timestamp.Format(view.DateFormat),
-		GetHashColor(sender))
+		widget.GetHashColor(sender))
 }
 
 func (view *MessageView) SaveHistory(path string) error {
@@ -112,7 +114,7 @@ func (view *MessageView) LoadHistory(path string) (int, error) {
 	}
 
 	for _, message := range view.messages {
-		view.updateWidestSender(message.Sender)
+		view.updateWidestSender(message.Sender())
 	}
 
 	return len(view.messages), nil
@@ -127,57 +129,61 @@ func (view *MessageView) updateWidestSender(sender string) {
 	}
 }
 
-type MessageDirection int
-
-const (
-	AppendMessage MessageDirection = iota
-	PrependMessage
-	IgnoreMessage
-)
-
-func (view *MessageView) UpdateMessageID(message *types.Message, newID string) {
-	delete(view.messageIDs, message.ID)
-	message.ID = newID
-	view.messageIDs[message.ID] = message
+func (view *MessageView) UpdateMessageID(ifcMessage ifc.Message, newID string) {
+	message, ok := ifcMessage.(messages.UIMessage)
+	if !ok {
+		debug.Print("[Warning] Passed non-UIMessage ifc.Message object to UpdateMessageID().")
+		debug.PrintStack()
+		return
+	}
+	delete(view.messageIDs, message.ID())
+	message.SetID(newID)
+	view.messageIDs[message.ID()] = message
 }
 
-func (view *MessageView) AddMessage(message *types.Message, direction MessageDirection) {
-	if message == nil {
+func (view *MessageView) AddMessage(ifcMessage ifc.Message, direction ifc.MessageDirection) {
+	if ifcMessage == nil {
+		return
+	}
+	message, ok := ifcMessage.(messages.UIMessage)
+	if !ok {
+		debug.Print("[Warning] Passed non-UIMessage ifc.Message object to AddMessage().")
+		debug.PrintStack()
 		return
 	}
 
-	msg, messageExists := view.messageIDs[message.ID]
+	msg, messageExists := view.messageIDs[message.ID()]
 	if msg != nil && messageExists {
-		message.CopyTo(msg)
+		msg.CopyFrom(message)
 		message = msg
-		direction = IgnoreMessage
+		direction = ifc.IgnoreMessage
 	}
 
-	view.updateWidestSender(message.Sender)
+	view.updateWidestSender(message.Sender())
 
 	_, _, width, _ := view.GetInnerRect()
 	width -= view.TimestampWidth + TimestampSenderGap + view.widestSender + SenderMessageGap
 	message.CalculateBuffer(width)
 
-	if direction == AppendMessage {
+	if direction == ifc.AppendMessage {
 		if view.ScrollOffset > 0 {
 			view.ScrollOffset += message.Height()
 		}
 		view.messages = append(view.messages, message)
 		view.appendBuffer(message)
-	} else if direction == PrependMessage {
-		view.messages = append([]*types.Message{message}, view.messages...)
+	} else if direction == ifc.PrependMessage {
+		view.messages = append([]messages.UIMessage{message}, view.messages...)
 	}
 
-	view.messageIDs[message.ID] = message
+	view.messageIDs[message.ID()] = message
 }
 
-func (view *MessageView) appendBuffer(message *types.Message) {
+func (view *MessageView) appendBuffer(message messages.UIMessage) {
 	if len(view.metaBuffer) > 0 {
 		prevMeta := view.metaBuffer[len(view.metaBuffer)-1]
-		if prevMeta != nil && prevMeta.GetDate() != message.Date {
-			view.textBuffer = append(view.textBuffer, fmt.Sprintf("Date changed to %s", message.Date))
-			view.metaBuffer = append(view.metaBuffer, &types.BasicMeta{TextColor: tcell.ColorGreen})
+		if prevMeta != nil && prevMeta.Date() != message.Date() {
+			view.textBuffer = append(view.textBuffer, fmt.Sprintf("Date changed to %s", message.Date()))
+			view.metaBuffer = append(view.metaBuffer, &messages.BasicMeta{BTextColor: tcell.ColorGreen})
 		}
 	}
 
@@ -195,7 +201,7 @@ func (view *MessageView) recalculateBuffers() {
 	recalculateMessageBuffers := width != view.prevWidth
 	if height != view.prevHeight || recalculateMessageBuffers || len(view.messages) != view.prevMsgCount {
 		view.textBuffer = []string{}
-		view.metaBuffer = []types.MessageMeta{}
+		view.metaBuffer = []ifc.MessageMeta{}
 		view.prevMsgCount = 0
 		for _, message := range view.messages {
 			if recalculateMessageBuffers {
@@ -280,7 +286,7 @@ func (view *MessageView) Draw(screen tcell.Screen) {
 	view.recalculateBuffers()
 
 	if len(view.textBuffer) == 0 {
-		writeLineSimple(screen, "It's quite empty in here.", x, y+height)
+		widget.WriteLineSimple(screen, "It's quite empty in here.", x, y+height)
 		return
 	}
 
@@ -294,11 +300,11 @@ func (view *MessageView) Draw(screen tcell.Screen) {
 		if view.LoadingMessages {
 			message = "Loading more messages..."
 		}
-		writeLineSimpleColor(screen, message, messageX, y, tcell.ColorGreen)
+		widget.WriteLineSimpleColor(screen, message, messageX, y, tcell.ColorGreen)
 	}
 
 	if len(view.textBuffer) != len(view.metaBuffer) {
-		debug.ExtPrintf("Unexpected text/meta buffer length mismatch: %d != %d.", len(view.textBuffer), len(view.metaBuffer))
+		debug.Printf("Unexpected text/meta buffer length mismatch: %d != %d.", len(view.textBuffer), len(view.metaBuffer))
 		return
 	}
 
@@ -313,7 +319,7 @@ func (view *MessageView) Draw(screen tcell.Screen) {
 		scrollBarPos = height - int(math.Round(float64(view.ScrollOffset)/contentHeight*viewportHeight))
 	}
 
-	var prevMeta types.MessageMeta
+	var prevMeta ifc.MessageMeta
 	firstLine := true
 	skippedLines := 0
 
@@ -338,17 +344,17 @@ func (view *MessageView) Draw(screen tcell.Screen) {
 
 		text, meta := view.textBuffer[index], view.metaBuffer[index]
 		if meta != prevMeta {
-			if len(meta.GetTimestamp()) > 0 {
-				writeLineSimpleColor(screen, meta.GetTimestamp(), x, y+line, meta.GetTimestampColor())
+			if len(meta.Timestamp()) > 0 {
+				widget.WriteLineSimpleColor(screen, meta.Timestamp(), x, y+line, meta.TimestampColor())
 			}
-			if prevMeta == nil || meta.GetSender() != prevMeta.GetSender() {
-				writeLineColor(
-					screen, tview.AlignRight, meta.GetSender(),
+			if prevMeta == nil || meta.Sender() != prevMeta.Sender() {
+				widget.WriteLineColor(
+					screen, tview.AlignRight, meta.Sender(),
 					usernameX, y+line, view.widestSender,
-					meta.GetSenderColor())
+					meta.SenderColor())
 			}
 			prevMeta = meta
 		}
-		writeLineSimpleColor(screen, text, messageX, y+line, meta.GetTextColor())
+		widget.WriteLineSimpleColor(screen, text, messageX, y+line, meta.TextColor())
 	}
 }
diff --git a/ui/messages/doc.go b/ui/messages/doc.go
new file mode 100644
index 0000000..7c3c077
--- /dev/null
+++ b/ui/messages/doc.go
@@ -0,0 +1,2 @@
+// Package types contains common type definitions used by the UI.
+package messages
diff --git a/ui/debug/external.go b/ui/messages/message.go
index faabbcc..ef0966c 100644
--- a/ui/debug/external.go
+++ b/ui/messages/message.go
@@ -14,32 +14,16 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package debug
+package messages
 
-import (
-	"fmt"
-	"io"
-	"os"
-)
+import "maunium.net/go/gomuks/interface"
 
-var writer io.Writer
+// Message is a wrapper for the content and metadata of a Matrix message intended to be displayed.
+type UIMessage interface {
+	ifc.Message
 
-func EnableExternal() {
-	var err error
-	writer, err = os.OpenFile("/tmp/gomuks-debug.log", os.O_WRONLY|os.O_APPEND, 0644)
-	if err != nil {
-		writer = nil
-	}
-}
-
-func ExtPrintf(text string, args ...interface{}) {
-	if writer != nil {
-		fmt.Fprintf(writer, text+"\n", args...)
-	}
-}
-
-func ExtPrint(text ...interface{}) {
-	if writer != nil {
-		fmt.Fprintln(writer, text...)
-	}
+	CalculateBuffer(width int)
+	RecalculateBuffer()
+	Buffer() []string
+	Height() int
 }
diff --git a/ui/messages/meta.go b/ui/messages/meta.go
new file mode 100644
index 0000000..8cb6c1b
--- /dev/null
+++ b/ui/messages/meta.go
@@ -0,0 +1,70 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"github.com/gdamore/tcell"
+	"maunium.net/go/gomuks/interface"
+)
+
+// BasicMeta is a simple variable store implementation of MessageMeta.
+type BasicMeta struct {
+	BSender, BTimestamp, BDate                string
+	BSenderColor, BTextColor, BTimestampColor tcell.Color
+}
+
+// Sender gets the string that should be displayed as the sender of this message.
+func (meta *BasicMeta) Sender() string {
+	return meta.BSender
+}
+
+// SenderColor returns the color the name of the sender should be shown in.
+func (meta *BasicMeta) SenderColor() tcell.Color {
+	return meta.BSenderColor
+}
+
+// Timestamp returns the formatted time when the message was sent.
+func (meta *BasicMeta) Timestamp() string {
+	return meta.BTimestamp
+}
+
+// Date returns the formatted date when the message was sent.
+func (meta *BasicMeta) Date() string {
+	return meta.BDate
+}
+
+// TextColor returns the color the actual content of the message should be shown in.
+func (meta *BasicMeta) TextColor() tcell.Color {
+	return meta.BTextColor
+}
+
+// TimestampColor returns the color the timestamp should be shown in.
+//
+// This usually does not apply to the date, as it is rendered separately from the message.
+func (meta *BasicMeta) TimestampColor() tcell.Color {
+	return meta.BTimestampColor
+}
+
+// CopyFrom replaces the content of this meta object with the content of the given object.
+func (meta *BasicMeta) CopyFrom(from ifc.MessageMeta) {
+	meta.BSender = from.Sender()
+	meta.BTimestamp = from.Timestamp()
+	meta.BDate = from.Date()
+	meta.BSenderColor = from.SenderColor()
+	meta.BTextColor = from.TextColor()
+	meta.BTimestampColor = from.TimestampColor()
+}
diff --git a/ui/messages/textmessage.go b/ui/messages/textmessage.go
new file mode 100644
index 0000000..1f37418
--- /dev/null
+++ b/ui/messages/textmessage.go
@@ -0,0 +1,295 @@
+// gomuks - A terminal Matrix client written in Go.
+// Copyright (C) 2018 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package messages
+
+import (
+	"encoding/gob"
+	"fmt"
+	"regexp"
+	"strings"
+
+	"github.com/gdamore/tcell"
+	"github.com/mattn/go-runewidth"
+	"maunium.net/go/gomuks/interface"
+)
+
+func init() {
+	gob.Register(&UITextMessage{})
+}
+
+type UITextMessage struct {
+	MsgID           string
+	MsgType         string
+	MsgSender       string
+	MsgSenderColor  tcell.Color
+	MsgTimestamp    string
+	MsgDate         string
+	MsgText         string
+	MsgState        ifc.MessageState
+	MsgIsHighlight  bool
+	MsgIsService    bool
+	buffer          []string
+	prevBufferWidth int
+}
+
+// NewMessage creates a new Message object with the provided values and the default state.
+func NewMessage(id, sender, msgtype, text, timestamp, date string, senderColor tcell.Color) UIMessage {
+	return &UITextMessage{
+		MsgSender:       sender,
+		MsgTimestamp:    timestamp,
+		MsgDate:         date,
+		MsgSenderColor:  senderColor,
+		MsgType:         msgtype,
+		MsgText:         text,
+		MsgID:           id,
+		prevBufferWidth: 0,
+		MsgState:        ifc.MessageStateDefault,
+		MsgIsHighlight:  false,
+		MsgIsService:    false,
+	}
+}
+
+// CopyFrom replaces the content of this message object with the content of the given object.
+func (msg *UITextMessage) CopyFrom(from ifc.MessageMeta) {
+	msg.MsgSender = from.Sender()
+	msg.MsgTimestamp = from.Timestamp()
+	msg.MsgDate = from.Date()
+	msg.MsgSenderColor = from.SenderColor()
+
+	fromMsg, ok := from.(UIMessage)
+	if ok {
+		msg.MsgID = fromMsg.ID()
+		msg.MsgType = fromMsg.Type()
+		msg.MsgText = fromMsg.Text()
+		msg.MsgState = fromMsg.State()
+		msg.MsgIsService = fromMsg.IsService()
+		msg.MsgIsHighlight = fromMsg.IsHighlight()
+
+		msg.RecalculateBuffer()
+	}
+}
+
+// Sender gets the string that should be displayed as the sender of this message.
+//
+// If the message is being sent, the sender is "Sending...".
+// If sending has failed, the sender is "Error".
+// If the message is an emote, the sender is blank.
+// In any other case, the sender is the display name of the user who sent the message.
+func (msg *UITextMessage) Sender() string {
+	switch msg.MsgState {
+	case ifc.MessageStateSending:
+		return "Sending..."
+	case ifc.MessageStateFailed:
+		return "Error"
+	}
+	switch msg.MsgType {
+	case "m.emote":
+		// Emotes don't show a separate sender, it's included in the buffer.
+		return ""
+	default:
+		return msg.MsgSender
+	}
+}
+
+func (msg *UITextMessage) getStateSpecificColor() tcell.Color {
+	switch msg.MsgState {
+	case ifc.MessageStateSending:
+		return tcell.ColorGray
+	case ifc.MessageStateFailed:
+		return tcell.ColorRed
+	case ifc.MessageStateDefault:
+		fallthrough
+	default:
+		return tcell.ColorDefault
+	}
+}
+
+// SenderColor returns the color the name of the sender should be shown in.
+//
+// If the message is being sent, the color is gray.
+// If sending has failed, the color is red.
+//
+// In any other case, the color is whatever is specified in the Message struct.
+// Usually that means it is the hash-based color of the sender (see ui/widget/color.go)
+func (msg *UITextMessage) SenderColor() tcell.Color {
+	stateColor := msg.getStateSpecificColor()
+	switch {
+	case stateColor != tcell.ColorDefault:
+		return stateColor
+	case msg.MsgIsService:
+		return tcell.ColorGray
+	default:
+		return msg.MsgSenderColor
+	}
+}
+
+// TextColor returns the color the actual content of the message should be shown in.
+func (msg *UITextMessage) TextColor() tcell.Color {
+	stateColor := msg.getStateSpecificColor()
+	switch {
+	case stateColor != tcell.ColorDefault:
+		return stateColor
+	case msg.MsgIsService:
+		return tcell.ColorGray
+	case msg.MsgIsHighlight:
+		return tcell.ColorYellow
+	case msg.MsgType == "m.room.member":
+		return tcell.ColorGreen
+	default:
+		return tcell.ColorDefault
+	}
+}
+
+// TimestampColor returns the color the timestamp should be shown in.
+//
+// As with SenderColor(), messages being sent and messages that failed to be sent are
+// gray and red respectively.
+//
+// However, other messages are the default color instead of a color stored in the struct.
+func (msg *UITextMessage) TimestampColor() tcell.Color {
+	return msg.getStateSpecificColor()
+}
+
+// RecalculateBuffer calculates the buffer again with the previously provided width.
+func (msg *UITextMessage) RecalculateBuffer() {
+	msg.CalculateBuffer(msg.prevBufferWidth)
+}
+
+// Buffer returns the computed text buffer.
+//
+// The buffer contains the text of the message split into lines with a maximum
+// width of whatever was provided to CalculateBuffer().
+//
+// N.B. This will NOT automatically calculate the buffer if it hasn't been
+//      calculated already, as that requires the target width.
+func (msg *UITextMessage) Buffer() []string {
+	return msg.buffer
+}
+
+// Height returns the number of rows in the computed buffer (see Buffer()).
+func (msg *UITextMessage) Height() int {
+	return len(msg.buffer)
+}
+
+// Timestamp returns the formatted time when the message was sent.
+func (msg *UITextMessage) Timestamp() string {
+	return msg.MsgTimestamp
+}
+
+// Date returns the formatted date when the message was sent.
+func (msg *UITextMessage) Date() string {
+	return msg.MsgDate
+}
+
+func (msg *UITextMessage) ID() string {
+	return msg.MsgID
+}
+
+func (msg *UITextMessage) SetID(id string) {
+	msg.MsgID = id
+}
+
+func (msg *UITextMessage) Type() string {
+	return msg.MsgType
+}
+
+func (msg *UITextMessage) SetType(msgtype string) {
+	msg.MsgType = msgtype
+}
+
+func (msg *UITextMessage) Text() string {
+	return msg.MsgText
+}
+
+func (msg *UITextMessage) SetText(text string) {
+	msg.MsgText = text
+}
+
+func (msg *UITextMessage) State() ifc.MessageState {
+	return msg.MsgState
+}
+
+func (msg *UITextMessage) SetState(state ifc.MessageState) {
+	msg.MsgState = state
+}
+
+func (msg *UITextMessage) IsHighlight() bool {
+	return msg.MsgIsHighlight
+}
+
+func (msg *UITextMessage) SetIsHighlight(isHighlight bool) {
+	msg.MsgIsHighlight = isHighlight
+}
+
+func (msg *UITextMessage) IsService() bool {
+	return msg.MsgIsService
+}
+
+func (msg *UITextMessage) SetIsService(isService bool) {
+	msg.MsgIsService = isService
+}
+
+// Regular expressions used to split lines when calculating the buffer.
+//
+// From tview/textview.go
+var (
+	boundaryPattern = regexp.MustCompile("([[:punct:]]\\s*|\\s+)")
+	spacePattern    = regexp.MustCompile(`\s+`)
+)
+
+// CalculateBuffer generates the internal buffer for this message that consists
+// of the text of this message split into lines at most as wide as the width
+// parameter.
+func (msg *UITextMessage) CalculateBuffer(width int) {
+	if width < 2 {
+		return
+	}
+
+	msg.buffer = []string{}
+	text := msg.MsgText
+	if msg.MsgType == "m.emote" {
+		text = fmt.Sprintf("* %s %s", msg.MsgSender, msg.MsgText)
+	}
+
+	forcedLinebreaks := strings.Split(text, "\n")
+	newlines := 0
+	for _, str := range forcedLinebreaks {
+		if len(str) == 0 && newlines < 1 {
+			msg.buffer = append(msg.buffer, "")
+			newlines++
+		} else {
+			newlines = 0
+		}
+		// From tview/textview.go#reindexBuffer()
+		for len(str) > 0 {
+			extract := runewidth.Truncate(str, width, "")
+			if len(extract) < len(str) {
+				if spaces := spacePattern.FindStringIndex(str[len(extract):]); spaces != nil && spaces[0] == 0 {
+					extract = str[:len(extract)+spaces[1]]
+				}
+
+				matches := boundaryPattern.FindAllStringIndex(extract, -1)
+				if len(matches) > 0 {
+					extract = extract[:matches[len(matches)-1][1]]
+				}
+			}
+			msg.buffer = append(msg.buffer, extract)
+			str = str[len(extract):]
+		}
+	}
+	msg.prevBufferWidth = width
+}
diff --git a/ui/widget/room-list.go b/ui/room-list.go
index d2fb543..2ff3ed7 100644
--- a/ui/widget/room-list.go
+++ b/ui/room-list.go
@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package widget
+package ui
 
 import (
 	"fmt"
@@ -22,6 +22,7 @@ import (
 
 	"github.com/gdamore/tcell"
 	"maunium.net/go/gomuks/matrix/rooms"
+	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )
 
@@ -126,11 +127,11 @@ func (list *RoomList) Draw(screen tcell.Screen) {
 				unreadMessageCount += "!"
 			}
 			unreadMessageCount = fmt.Sprintf("(%s)", unreadMessageCount)
-			writeLine(screen, tview.AlignRight, unreadMessageCount, x+lineWidth-6, y, 6, style)
+			widget.WriteLine(screen, tview.AlignRight, unreadMessageCount, x+lineWidth-6, y, 6, style)
 			lineWidth -= len(unreadMessageCount) + 1
 		}
 
-		writeLine(screen, tview.AlignLeft, text, x, y, lineWidth, style)
+		widget.WriteLine(screen, tview.AlignLeft, text, x, y, lineWidth, style)
 
 		y++
 		if y >= bottomLimit {
diff --git a/ui/widget/room-view.go b/ui/room-view.go
index 4bab779..24325b4 100644
--- a/ui/widget/room-view.go
+++ b/ui/room-view.go
@@ -14,7 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-package widget
+package ui
 
 import (
 	"fmt"
@@ -24,8 +24,10 @@ import (
 	"time"
 
 	"github.com/gdamore/tcell"
+	"maunium.net/go/gomuks/interface"
 	"maunium.net/go/gomuks/matrix/rooms"
-	"maunium.net/go/gomuks/ui/types"
+	"maunium.net/go/gomuks/ui/messages"
+	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )
 
@@ -36,8 +38,8 @@ type RoomView struct {
 	content  *MessageView
 	status   *tview.TextView
 	userList *tview.TextView
-	ulBorder *Border
-	input    *AdvancedInputField
+	ulBorder *widget.Border
+	input    *widget.AdvancedInputField
 	Room     *rooms.Room
 }
 
@@ -48,8 +50,8 @@ func NewRoomView(room *rooms.Room) *RoomView {
 		content:  NewMessageView(),
 		status:   tview.NewTextView(),
 		userList: tview.NewTextView(),
-		ulBorder: NewBorder(),
-		input:    NewAdvancedInputField(),
+		ulBorder: widget.NewBorder(),
+		input:    widget.NewAdvancedInputField(),
 		Room:     room,
 	}
 
@@ -129,7 +131,7 @@ func (view *RoomView) GetInputText() string {
 	return view.input.GetText()
 }
 
-func (view *RoomView) GetInputField() *AdvancedInputField {
+func (view *RoomView) GetInputField() *widget.AdvancedInputField {
 	return view.input
 }
 
@@ -230,15 +232,19 @@ func (view *RoomView) MessageView() *MessageView {
 	return view.content
 }
 
+func (view *RoomView) MxRoom() *rooms.Room {
+	return view.Room
+}
+
 func (view *RoomView) UpdateUserList() {
 	var joined strings.Builder
 	var invited strings.Builder
 	for _, user := range view.Room.GetMembers() {
 		if user.Membership == "join" {
-			joined.WriteString(AddHashColor(user.DisplayName))
+			joined.WriteString(widget.AddHashColor(user.DisplayName))
 			joined.WriteRune('\n')
 		} else if user.Membership == "invite" {
-			invited.WriteString(AddHashColor(user.DisplayName))
+			invited.WriteString(widget.AddHashColor(user.DisplayName))
 			invited.WriteRune('\n')
 		}
 	}
@@ -249,7 +255,7 @@ func (view *RoomView) UpdateUserList() {
 	}
 }
 
-func (view *RoomView) NewMessage(id, sender, msgtype, text string, timestamp time.Time) *types.Message {
+func (view *RoomView) newUIMessage(id, sender, msgtype, text string, timestamp time.Time) messages.UIMessage {
 	member := view.Room.GetMember(sender)
 	if member != nil {
 		sender = member.DisplayName
@@ -257,19 +263,29 @@ func (view *RoomView) NewMessage(id, sender, msgtype, text string, timestamp tim
 	return view.content.NewMessage(id, sender, msgtype, text, timestamp)
 }
 
-func (view *RoomView) NewTempMessage(msgtype, text string) *types.Message {
+func (view *RoomView) NewMessage(id, sender, msgtype, text string, timestamp time.Time) ifc.Message {
+	return view.newUIMessage(id, sender, msgtype, text, timestamp)
+}
+
+func (view *RoomView) NewTempMessage(msgtype, text string) ifc.Message {
 	now := time.Now()
 	id := strconv.FormatInt(now.UnixNano(), 10)
 	sender := ""
 	if ownerMember := view.Room.GetSessionOwner(); ownerMember != nil {
 		sender = ownerMember.DisplayName
 	}
-	message := view.NewMessage(id, sender, msgtype, text, now)
-	message.State = types.MessageStateSending
-	view.AddMessage(message, AppendMessage)
+	message := view.newUIMessage(id, sender, msgtype, text, now)
+	message.SetState(ifc.MessageStateSending)
+	view.AddMessage(message, ifc.AppendMessage)
 	return message
 }
 
-func (view *RoomView) AddMessage(message *types.Message, direction MessageDirection) {
+func (view *RoomView) AddServiceMessage(text string) {
+	message := view.newUIMessage("", "*", "gomuks.service", text, time.Now())
+	message.SetIsService(true)
+	view.AddMessage(message, ifc.AppendMessage)
+}
+
+func (view *RoomView) AddMessage(message ifc.Message, direction ifc.MessageDirection) {
 	view.content.AddMessage(message, direction)
 }
diff --git a/ui/types/doc.go b/ui/types/doc.go
deleted file mode 100644
index 5bc229c..0000000
--- a/ui/types/doc.go
+++ /dev/null
@@ -1,2 +0,0 @@
-// Package types contains common type definitions used mostly by the UI, but also other parts of gomuks.
-package types
diff --git a/ui/types/message.go b/ui/types/message.go
deleted file mode 100644
index fa3b6ef..0000000
--- a/ui/types/message.go
+++ /dev/null
@@ -1,234 +0,0 @@
-// gomuks - A terminal Matrix client written in Go.
-// Copyright (C) 2018 Tulir Asokan
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package types
-
-import (
-	"fmt"
-	"regexp"
-	"strings"
-
-	"github.com/gdamore/tcell"
-	"github.com/mattn/go-runewidth"
-)
-
-// MessageState is an enum to specify if a Message is being sent, failed to send or was successfully sent.
-type MessageState int
-
-// Allowed MessageStates.
-const (
-	MessageStateSending MessageState = iota
-	MessageStateDefault
-	MessageStateFailed
-)
-
-// Message is a wrapper for the content and metadata of a Matrix message intended to be displayed.
-type Message struct {
-	ID              string
-	Type            string
-	Sender          string
-	SenderColor     tcell.Color
-	TextColor       tcell.Color
-	Timestamp       string
-	Date            string
-	Text            string
-	State           MessageState
-	buffer          []string
-	prevBufferWidth int
-}
-
-// NewMessage creates a new Message object with the provided values and the default state.
-func NewMessage(id, sender, msgtype, text, timestamp, date string, senderColor tcell.Color) *Message {
-	return &Message{
-		Sender:          sender,
-		Timestamp:       timestamp,
-		Date:            date,
-		SenderColor:     senderColor,
-		TextColor:       tcell.ColorDefault,
-		Type:            msgtype,
-		Text:            text,
-		ID:              id,
-		prevBufferWidth: 0,
-		State:           MessageStateDefault,
-	}
-}
-
-// CopyTo copies the content of this message to the given message.
-func (message *Message) CopyTo(to *Message) {
-	to.ID = message.ID
-	to.Type = message.Type
-	to.Sender = message.Sender
-	to.SenderColor = message.SenderColor
-	to.TextColor = message.TextColor
-	to.Timestamp = message.Timestamp
-	to.Date = message.Date
-	to.Text = message.Text
-	to.State = message.State
-	to.RecalculateBuffer()
-}
-
-// GetSender gets the string that should be displayed as the sender of this message.
-//
-// If the message is being sent, the sender is "Sending...".
-// If sending has failed, the sender is "Error".
-// If the message is an emote, the sender is blank.
-// In any other case, the sender is the display name of the user who sent the message.
-func (message *Message) GetSender() string {
-	switch message.State {
-	case MessageStateSending:
-		return "Sending..."
-	case MessageStateFailed:
-		return "Error"
-	}
-	switch message.Type {
-	case "m.emote":
-		// Emotes don't show a separate sender, it's included in the buffer.
-		return ""
-	default:
-		return message.Sender
-	}
-}
-
-func (message *Message) getStateSpecificColor() tcell.Color {
-	switch message.State {
-	case MessageStateSending:
-		return tcell.ColorGray
-	case MessageStateFailed:
-		return tcell.ColorRed
-	case MessageStateDefault:
-		fallthrough
-	default:
-		return tcell.ColorDefault
-	}
-}
-
-// GetSenderColor returns the color the name of the sender should be shown in.
-//
-// If the message is being sent, the color is gray.
-// If sending has failed, the color is red.
-//
-// In any other case, the color is whatever is specified in the Message struct.
-// Usually that means it is the hash-based color of the sender (see ui/widget/color.go)
-func (message *Message) GetSenderColor() (color tcell.Color) {
-	color = message.getStateSpecificColor()
-	if color == tcell.ColorDefault {
-		color = message.SenderColor
-	}
-	return
-}
-
-// GetTextColor returns the color the actual content of the message should be shown in.
-//
-// This returns the same colors as GetSenderColor(), but takes the default color from a different variable.
-func (message *Message) GetTextColor() (color tcell.Color) {
-	color = message.getStateSpecificColor()
-	if color == tcell.ColorDefault {
-		color = message.TextColor
-	}
-	return
-}
-
-// GetTimestampColor returns the color the timestamp should be shown in.
-//
-// As with GetSenderColor(), messages being sent and messages that failed to be sent are
-// gray and red respectively.
-//
-// However, other messages are the default color instead of a color stored in the struct.
-func (message *Message) GetTimestampColor() tcell.Color {
-	return message.getStateSpecificColor()
-}
-
-// RecalculateBuffer calculates the buffer again with the previously provided width.
-func (message *Message) RecalculateBuffer() {
-	message.CalculateBuffer(message.prevBufferWidth)
-}
-
-// Buffer returns the computed text buffer.
-//
-// The buffer contains the text of the message split into lines with a maximum
-// width of whatever was provided to CalculateBuffer().
-//
-// N.B. This will NOT automatically calculate the buffer if it hasn't been
-//      calculated already, as that requires the target width.
-func (message *Message) Buffer() []string {
-	return message.buffer
-}
-
-// Height returns the number of rows in the computed buffer (see Buffer()).
-func (message *Message) Height() int {
-	return len(message.buffer)
-}
-
-// GetTimestamp returns the formatted time when the message was sent.
-func (message *Message) GetTimestamp() string {
-	return message.Timestamp
-}
-
-// GetDate returns the formatted date when the message was sent.
-func (message *Message) GetDate() string {
-	return message.Date
-}
-
-// Regular expressions used to split lines when calculating the buffer.
-//
-// From tview/textview.go
-var (
-	boundaryPattern = regexp.MustCompile("([[:punct:]]\\s*|\\s+)")
-	spacePattern    = regexp.MustCompile(`\s+`)
-)
-
-// CalculateBuffer generates the internal buffer for this message that consists
-// of the text of this message split into lines at most as wide as the width
-// parameter.
-func (message *Message) CalculateBuffer(width int) {
-	if width < 2 {
-		return
-	}
-
-	message.buffer = []string{}
-	text := message.Text
-	if message.Type == "m.emote" {
-		text = fmt.Sprintf("* %s %s", message.Sender, message.Text)
-	}
-
-	forcedLinebreaks := strings.Split(text, "\n")
-	newlines := 0
-	for _, str := range forcedLinebreaks {
-		if len(str) == 0 && newlines < 1 {
-			message.buffer = append(message.buffer, "")
-			newlines++
-		} else {
-			newlines = 0
-		}
-		// From tview/textview.go#reindexBuffer()
-		for len(str) > 0 {
-			extract := runewidth.Truncate(str, width, "")
-			if len(extract) < len(str) {
-				if spaces := spacePattern.FindStringIndex(str[len(extract):]); spaces != nil && spaces[0] == 0 {
-					extract = str[:len(extract)+spaces[1]]
-				}
-
-				matches := boundaryPattern.FindAllStringIndex(extract, -1)
-				if len(matches) > 0 {
-					extract = extract[:matches[len(matches)-1][1]]
-				}
-			}
-			message.buffer = append(message.buffer, extract)
-			str = str[len(extract):]
-		}
-	}
-	message.prevBufferWidth = width
-}
diff --git a/ui/types/meta.go b/ui/types/meta.go
deleted file mode 100644
index fdc6dba..0000000
--- a/ui/types/meta.go
+++ /dev/null
@@ -1,71 +0,0 @@
-// gomuks - A terminal Matrix client written in Go.
-// Copyright (C) 2018 Tulir Asokan
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-package types
-
-import (
-	"github.com/gdamore/tcell"
-)
-
-// MessageMeta is an interface to get the metadata of a message.
-//
-// See BasicMeta for a simple implementation and documentation of methods.
-type MessageMeta interface {
-	GetSender() string
-	GetSenderColor() tcell.Color
-	GetTextColor() tcell.Color
-	GetTimestampColor() tcell.Color
-	GetTimestamp() string
-	GetDate() string
-}
-
-// BasicMeta is a simple variable store implementation of MessageMeta.
-type BasicMeta struct {
-	Sender, Timestamp, Date                string
-	SenderColor, TextColor, TimestampColor tcell.Color
-}
-
-// GetSender gets the string that should be displayed as the sender of this message.
-func (meta *BasicMeta) GetSender() string {
-	return meta.Sender
-}
-
-// GetSenderColor returns the color the name of the sender should be shown in.
-func (meta *BasicMeta) GetSenderColor() tcell.Color {
-	return meta.SenderColor
-}
-
-// GetTimestamp returns the formatted time when the message was sent.
-func (meta *BasicMeta) GetTimestamp() string {
-	return meta.Timestamp
-}
-
-// GetDate returns the formatted date when the message was sent.
-func (meta *BasicMeta) GetDate() string {
-	return meta.Date
-}
-
-// GetTextColor returns the color the actual content of the message should be shown in.
-func (meta *BasicMeta) GetTextColor() tcell.Color {
-	return meta.TextColor
-}
-
-// GetTimestampColor returns the color the timestamp should be shown in.
-//
-// This usually does not apply to the date, as it is rendered separately from the message.
-func (meta *BasicMeta) GetTimestampColor() tcell.Color {
-	return meta.TimestampColor
-}
diff --git a/ui/view-login.go b/ui/view-login.go
index ff0e44e..8343aaa 100644
--- a/ui/view-login.go
+++ b/ui/view-login.go
@@ -19,7 +19,7 @@ package ui
 import (
 	"maunium.net/go/gomuks/config"
 	"maunium.net/go/gomuks/interface"
-	"maunium.net/go/gomuks/ui/debug"
+	"maunium.net/go/gomuks/debug"
 	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )
diff --git a/ui/view-main.go b/ui/view-main.go
index fd05492..b3b5b82 100644
--- a/ui/view-main.go
+++ b/ui/view-main.go
@@ -27,12 +27,11 @@ import (
 	"github.com/mattn/go-runewidth"
 	"maunium.net/go/gomatrix"
 	"maunium.net/go/gomuks/config"
+	"maunium.net/go/gomuks/debug"
 	"maunium.net/go/gomuks/interface"
 	"maunium.net/go/gomuks/matrix/pushrules"
 	"maunium.net/go/gomuks/matrix/rooms"
 	"maunium.net/go/gomuks/notification"
-	"maunium.net/go/gomuks/ui/debug"
-	"maunium.net/go/gomuks/ui/types"
 	"maunium.net/go/gomuks/ui/widget"
 	"maunium.net/go/tview"
 )
@@ -40,9 +39,9 @@ import (
 type MainView struct {
 	*tview.Flex
 
-	roomList         *widget.RoomList
+	roomList         *RoomList
 	roomView         *tview.Pages
-	rooms            map[string]*widget.RoomView
+	rooms            map[string]*RoomView
 	currentRoomIndex int
 	roomIDs          []string
 
@@ -57,9 +56,9 @@ type MainView struct {
 func (ui *GomuksUI) NewMainView() tview.Primitive {
 	mainView := &MainView{
 		Flex:     tview.NewFlex(),
-		roomList: widget.NewRoomList(),
+		roomList: NewRoomList(),
 		roomView: tview.NewPages(),
-		rooms:    make(map[string]*widget.RoomView),
+		rooms:    make(map[string]*RoomView),
 
 		matrix: ui.gmx.Matrix(),
 		gmx:    ui.gmx,
@@ -81,7 +80,7 @@ func (view *MainView) BumpFocus() {
 	view.lastFocusTime = time.Now()
 }
 
-func (view *MainView) InputChanged(roomView *widget.RoomView, text string) {
+func (view *MainView) InputChanged(roomView *RoomView, text string) {
 	if len(text) == 0 {
 		go view.matrix.SendTyping(roomView.Room.ID, false)
 	} else if text[0] != '/' {
@@ -101,7 +100,7 @@ func findWordToTabComplete(text string) string {
 	return output
 }
 
-func (view *MainView) InputTabComplete(roomView *widget.RoomView, text string, cursorOffset int) string {
+func (view *MainView) InputTabComplete(roomView *RoomView, text string, cursorOffset int) string {
 	str := runewidth.Truncate(text, cursorOffset, "")
 	word := findWordToTabComplete(str)
 	userCompletions := roomView.AutocompleteUser(word)
@@ -118,7 +117,7 @@ func (view *MainView) InputTabComplete(roomView *widget.RoomView, text string, c
 	return text
 }
 
-func (view *MainView) InputSubmit(roomView *widget.RoomView, text string) {
+func (view *MainView) InputSubmit(roomView *RoomView, text string) {
 	if len(text) == 0 {
 		return
 	} else if text[0] == '/' {
@@ -132,23 +131,23 @@ func (view *MainView) InputSubmit(roomView *widget.RoomView, text string) {
 	roomView.SetInputText("")
 }
 
-func (view *MainView) SendMessage(roomView *widget.RoomView, text string) {
+func (view *MainView) SendMessage(roomView *RoomView, text string) {
 	tempMessage := roomView.NewTempMessage("m.text", text)
 	go view.sendTempMessage(roomView, tempMessage)
 }
 
-func (view *MainView) sendTempMessage(roomView *widget.RoomView, tempMessage *types.Message) {
+func (view *MainView) sendTempMessage(roomView *RoomView, tempMessage ifc.Message) {
 	defer view.gmx.Recover()
-	eventID, err := view.matrix.SendMessage(roomView.Room.ID, tempMessage.Type, tempMessage.Text)
+	eventID, err := view.matrix.SendMessage(roomView.Room.ID, tempMessage.Type(), tempMessage.Text())
 	if err != nil {
-		tempMessage.State = types.MessageStateFailed
+		tempMessage.SetState(ifc.MessageStateFailed)
 		roomView.SetStatus(fmt.Sprintf("Failed to send message: %s", err))
 	} else {
 		roomView.MessageView().UpdateMessageID(tempMessage, eventID)
 	}
 }
 
-func (view *MainView) HandleCommand(roomView *widget.RoomView, command string, args []string) {
+func (view *MainView) HandleCommand(roomView *RoomView, command string, args []string) {
 	defer view.gmx.Recover()
 	debug.Print("Handling command", command, args)
 	switch command {
@@ -169,16 +168,16 @@ func (view *MainView) HandleCommand(roomView *widget.RoomView, command string, a
 		debug.Print("Leave room result:", view.matrix.LeaveRoom(roomView.Room.ID))
 	case "/join":
 		if len(args) == 0 {
-			view.AddServiceMessage(roomView, "Usage: /join <room>")
+			roomView.AddServiceMessage("Usage: /join <room>")
 			break
 		}
 		debug.Print("Join room result:", view.matrix.JoinRoom(args[0]))
 	default:
-		view.AddServiceMessage(roomView, "Unknown command.")
+		roomView.AddServiceMessage("Unknown command.")
 	}
 }
 
-func (view *MainView) KeyEventHandler(roomView *widget.RoomView, key *tcell.EventKey) *tcell.EventKey {
+func (view *MainView) KeyEventHandler(roomView *RoomView, key *tcell.EventKey) *tcell.EventKey {
 	view.BumpFocus()
 
 	k := key.Key()
@@ -220,7 +219,7 @@ func (view *MainView) KeyEventHandler(roomView *widget.RoomView, key *tcell.Even
 
 const WheelScrollOffsetDiff = 3
 
-func (view *MainView) MouseEventHandler(roomView *widget.RoomView, event *tcell.EventMouse) *tcell.EventMouse {
+func (view *MainView) MouseEventHandler(roomView *RoomView, event *tcell.EventMouse) *tcell.EventMouse {
 	if event.Buttons() == tcell.ButtonNone {
 		return event
 	}
@@ -300,7 +299,7 @@ func (view *MainView) addRoom(index int, room string) {
 
 	view.roomList.Add(roomStore)
 	if !view.roomView.HasPage(room) {
-		roomView := widget.NewRoomView(roomStore).
+		roomView := NewRoomView(roomStore).
 			SetInputSubmitFunc(view.InputSubmit).
 			SetInputChangedFunc(view.InputChanged).
 			SetTabCompleteFunc(view.InputTabComplete).
@@ -319,7 +318,7 @@ func (view *MainView) addRoom(index int, room string) {
 	}
 }
 
-func (view *MainView) GetRoom(id string) *widget.RoomView {
+func (view *MainView) GetRoom(id string) ifc.RoomView {
 	return view.rooms[id]
 }
 
@@ -352,7 +351,7 @@ func (view *MainView) RemoveRoom(room string) {
 	} else {
 		removeIndex = sort.StringSlice(view.roomIDs).Search(room)
 	}
-	view.roomList.Remove(roomView.Room)
+	view.roomList.Remove(roomView.MxRoom())
 	view.roomIDs = append(view.roomIDs[:removeIndex], view.roomIDs[removeIndex+1:]...)
 	view.roomView.RemovePage(room)
 	delete(view.rooms, room)
@@ -363,7 +362,7 @@ func (view *MainView) SetRooms(rooms []string) {
 	view.roomIDs = rooms
 	view.roomList.Clear()
 	view.roomView.Clear()
-	view.rooms = make(map[string]*widget.RoomView)
+	view.rooms = make(map[string]*RoomView)
 	for index, room := range rooms {
 		view.addRoom(index, room)
 	}
@@ -385,14 +384,14 @@ func sendNotification(room *rooms.Room, sender, text string, critical, sound boo
 	notification.Send(sender, text, critical, sound)
 }
 
-func (view *MainView) NotifyMessage(room *rooms.Room, message *types.Message, should pushrules.PushActionArrayShould) {
+func (view *MainView) NotifyMessage(room *rooms.Room, message ifc.Message, should pushrules.PushActionArrayShould) {
 	// Whether or not the room where the message came is the currently shown room.
 	isCurrent := room.ID == view.CurrentRoomID()
 	// Whether or not the terminal window is focused.
 	isFocused := view.lastFocusTime.Add(30 * time.Second).Before(time.Now())
 
 	// Whether or not the push rules say this message should be notified about.
-	shouldNotify := (should.Notify || !should.NotifySpecified) && message.Sender != view.config.Session.UserID
+	shouldNotify := (should.Notify || !should.NotifySpecified) && message.Sender() != view.config.Session.UserID
 
 	if !isCurrent {
 		// The message is not in the current room, show new message status in room list.
@@ -406,21 +405,10 @@ func (view *MainView) NotifyMessage(room *rooms.Room, message *types.Message, sh
 	if shouldNotify && !isFocused {
 		// Push rules say notify and the terminal is not focused, send desktop notification.
 		shouldPlaySound := should.PlaySound && should.SoundName == "default"
-		sendNotification(room, message.Sender, message.Text, should.Highlight, shouldPlaySound)
+		sendNotification(room, message.Sender(), message.Text(), should.Highlight, shouldPlaySound)
 	}
 
-	if should.Highlight {
-		// Message is highlight, set color.
-		message.TextColor = tcell.ColorYellow
-	}
-}
-
-func (view *MainView) AddServiceMessage(roomView *widget.RoomView, text string) {
-	message := roomView.NewMessage("", "*", "gomuks.service", text, time.Now())
-	message.TextColor = tcell.ColorGray
-	message.SenderColor = tcell.ColorGray
-	roomView.AddMessage(message, widget.AppendMessage)
-	view.parent.Render()
+	message.SetIsHighlight(should.Highlight)
 }
 
 func (view *MainView) LoadHistory(room string, initial bool) {
@@ -452,20 +440,20 @@ func (view *MainView) LoadHistory(room string, initial bool) {
 	}
 	history, prevBatch, err := view.matrix.GetHistory(roomView.Room.ID, batch, 50)
 	if err != nil {
-		view.AddServiceMessage(roomView, "Failed to fetch history")
+		roomView.AddServiceMessage("Failed to fetch history")
 		debug.Print("Failed to fetch history for", roomView.Room.ID, err)
 		return
 	}
 	roomView.Room.PrevBatch = prevBatch
 	for _, evt := range history {
-		var message *types.Message
+		var message ifc.Message
 		if evt.Type == "m.room.message" {
 			message = view.ProcessMessageEvent(roomView, &evt)
 		} else if evt.Type == "m.room.member" {
 			message = view.ProcessMembershipEvent(roomView, &evt)
 		}
 		if message != nil {
-			roomView.AddMessage(message, widget.PrependMessage)
+			roomView.AddMessage(message, ifc.PrependMessage)
 		}
 	}
 	err = roomView.SaveHistory(view.config.HistoryDir)
@@ -476,7 +464,7 @@ func (view *MainView) LoadHistory(room string, initial bool) {
 	view.parent.Render()
 }
 
-func (view *MainView) ProcessMessageEvent(room *widget.RoomView, evt *gomatrix.Event) (message *types.Message) {
+func (view *MainView) ProcessMessageEvent(room ifc.RoomView, evt *gomatrix.Event) ifc.Message {
 	text, _ := evt.Content["body"].(string)
 	msgtype, _ := evt.Content["msgtype"].(string)
 	return room.NewMessage(evt.ID, evt.Sender, msgtype, text, unixToTime(evt.Timestamp))
@@ -519,14 +507,12 @@ func (view *MainView) getMembershipEventContent(evt *gomatrix.Event) (sender, te
 	return
 }
 
-func (view *MainView) ProcessMembershipEvent(room *widget.RoomView, evt *gomatrix.Event) (message *types.Message) {
+func (view *MainView) ProcessMembershipEvent(room ifc.RoomView, evt *gomatrix.Event) ifc.Message {
 	sender, text := view.getMembershipEventContent(evt)
 	if len(text) == 0 {
-		return
+		return nil
 	}
-	message = room.NewMessage(evt.ID, sender, "m.room.member", text, unixToTime(evt.Timestamp))
-	message.TextColor = tcell.ColorGreen
-	return
+	return room.NewMessage(evt.ID, sender, "m.room.member", text, unixToTime(evt.Timestamp))
 }
 
 func unixToTime(unix int64) time.Time {
diff --git a/ui/widget/util.go b/ui/widget/util.go
index 0888210..bd80903 100644
--- a/ui/widget/util.go
+++ b/ui/widget/util.go
@@ -22,19 +22,19 @@ import (
 	"maunium.net/go/tview"
 )
 
-func writeLineSimple(screen tcell.Screen, line string, x, y int) {
-	writeLine(screen, tview.AlignLeft, line, x, y, 1<<30, tcell.StyleDefault)
+func WriteLineSimple(screen tcell.Screen, line string, x, y int) {
+	WriteLine(screen, tview.AlignLeft, line, x, y, 1<<30, tcell.StyleDefault)
 }
 
-func writeLineSimpleColor(screen tcell.Screen, line string, x, y int, color tcell.Color) {
-	writeLine(screen, tview.AlignLeft, line, x, y, 1<<30, tcell.StyleDefault.Foreground(color))
+func WriteLineSimpleColor(screen tcell.Screen, line string, x, y int, color tcell.Color) {
+	WriteLine(screen, tview.AlignLeft, line, x, y, 1<<30, tcell.StyleDefault.Foreground(color))
 }
 
-func writeLineColor(screen tcell.Screen, align int, line string, x, y, maxWidth int, color tcell.Color) {
-	writeLine(screen, align, line, x, y, maxWidth, tcell.StyleDefault.Foreground(color))
+func WriteLineColor(screen tcell.Screen, align int, line string, x, y, maxWidth int, color tcell.Color) {
+	WriteLine(screen, align, line, x, y, maxWidth, tcell.StyleDefault.Foreground(color))
 }
 
-func writeLine(screen tcell.Screen, align int, line string, x, y, maxWidth int, style tcell.Style) {
+func WriteLine(screen tcell.Screen, align int, line string, x, y, maxWidth int, style tcell.Style) {
 	offsetX := 0
 	if align == tview.AlignRight {
 		offsetX = maxWidth - runewidth.StringWidth(line)