From 335f57fbc8403b32b5e3d8ea1cb1b713cdacb5fc Mon Sep 17 00:00:00 2001
From: citrons <citrons@mondecitronne.com>
Date: Sun, 1 Jun 2025 19:10:35 -0500
Subject: message history

---
 client/buffer/buffer.go  |  6 +++++-
 client/channel_window.go | 38 +++++++++++++++++++++++++++++++++++++-
 tui/layout.go            | 14 ++++++--------
 3 files changed, 48 insertions(+), 10 deletions(-)

diff --git a/client/buffer/buffer.go b/client/buffer/buffer.go
index b57ec26..921ad00 100644
--- a/client/buffer/buffer.go
+++ b/client/buffer/buffer.go
@@ -31,6 +31,10 @@ func (l List) Next() *List {
 	return l.next
 }
 
+func (l List) Msg() Message {
+	return l.msg
+}
+
 func (b *Buffer) Top() *List {
 	return b.top
 }
@@ -57,7 +61,7 @@ func (b *Buffer) AddTop(msg Message) {
 	if b.top != nil {
 		b.top.prev = &l
 		l.next = b.top
-		l.odd = !b.bottom.odd
+		l.odd = !b.top.odd
 	}
 	b.top = &l
 	if b.bottom == nil {
diff --git a/client/channel_window.go b/client/channel_window.go
index 43ce83f..b4c9b9f 100644
--- a/client/channel_window.go
+++ b/client/channel_window.go
@@ -19,6 +19,7 @@ type channelWindow struct {
 	input tui.TextInput
 	watchedUsers map[string]bool
 	loadingHistory bool
+	endOfHistory bool
 }
 
 type channelMsg struct {
@@ -34,6 +35,7 @@ func (cl channelLocation) CreateWindow() window.Window {
 		location: cl, watchedUsers: make(map[string]bool),
 	}
 	globalApp.cache.Watch(cl.id)
+	cw.loadMoreHistory()
 	return cw
 }
 
@@ -73,6 +75,9 @@ func (cw *channelWindow) Kill() {
 }
 
 func (cw *channelWindow) Buffer() *buffer.Buffer {
+	if cw.buf.AtTop() {
+		cw.loadMoreHistory()
+	}
 	return &cw.buf
 }
 
@@ -107,6 +112,37 @@ func (cw *channelWindow) leaveChannel() {
 	globalApp.windowCache.Evict(cw.location)
 }
 
+func (cw *channelWindow) loadMoreHistory() {
+	if cw.loadingHistory || cw.endOfHistory {
+		return
+	}
+	cw.loadingHistory = true
+
+	rq := proto.Object {Fields: make(map[string]string)}
+	top := cw.buf.Top()
+	if top != nil {
+		rq.Kind = "before"
+		rq.Fields[""] = top.Msg().(channelMsg).Object.Id
+	} else {
+		rq.Kind = "latest"
+	}
+	cb := func(response proto.Command) {
+		cw.loadingHistory = false
+		switch response.Kind {
+		case "history":
+			if len(response.Args) == 0 {
+				cw.endOfHistory = true
+			}
+			for i := len(response.Args) - 1; i >= 0; i-- {
+				cw.buf.AddTop(channelMsg {response.Args[i], cw})
+			}
+		case "fail":
+			cw.endOfHistory = true
+		}
+	}
+	globalApp.Request(proto.NewCmd("history", cw.location.id, rq), cb)
+}
+
 type userListMsg struct {
 	index int
 	channelName string
@@ -177,7 +213,7 @@ func (cw *channelWindow) ShowStatusLine() {
 	}
 	tui.Text(ch.Fields[""], nil)
 	if cw.loadingHistory {
-		tui.Text("...", nil)
+		tui.Text(" ...", nil)
 	}
 }
 
diff --git a/tui/layout.go b/tui/layout.go
index 5811f4e..480f3cc 100644
--- a/tui/layout.go
+++ b/tui/layout.go
@@ -285,9 +285,10 @@ func (b *Box) computePositions(axis int) {
 
 			if last != nil {
 				lastPos := last.computedPosition
-				lastPos += last.computedSize[axis]
 				if b.Dir.reverse() {
 					lastPos = b.computedSize[axis] - lastPos
+				} else {
+					lastPos += last.computedSize[axis]
 				}
 				b.Scroll.absolute = min(b.Scroll.absolute, lastPos - b.computedSize[axis])
 			}
@@ -300,7 +301,7 @@ func (b *Box) computePositions(axis int) {
 				} else {
 					c.computedPosition += b.Scroll.absolute
 				}
-				if c.computedPosition > b.computedRect.min[axis] &&
+				if c.computedPosition >= b.computedRect.min[axis] &&
 						c.computedPosition < b.computedRect.max[axis] {
 					if firstShown == nil {
 						firstShown = c
@@ -308,12 +309,9 @@ func (b *Box) computePositions(axis int) {
 					lastShown = c
 				}
 			}
-			if firstShown == first {
-				b.Scroll.atFirst = true
-			}
-			if lastShown == last {
-				b.Scroll.atLast = true
-			}
+			b.Scroll.atFirst = firstShown == first
+			b.Scroll.atLast = lastShown == last
+
 			if firstShown != nil {
 				p := first.computedPosition
 				if b.Dir.reverse() {
-- 
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