improve ui architecture

internal/adapters/ui/splash.go

@@ -0,0 +1,66 @@
+package ui
+
+import (
+	"github.com/gdamore/tcell/v2"
+	"github.com/rivo/tview"
+	"strings"
+	"time"
+)
+
+// buildSplash creates a splash screen with a spinner; returns primitive and a stop function
+func buildSplash(app *tview.Application) (tview.Primitive, func()) {
+	// Brand styling
+	title := "[#FFFFFF::b]lazy[-][#55D7FF::b]ssh[-]"
+	tagline := "[#AAAAAA]Fast server picker TUI • Loading your servers…[-]"
+	spinnerFrames := []string{"⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"}
+
+	text := tview.NewTextView().
+		SetDynamicColors(true).
+		SetTextAlign(tview.AlignCenter)
+	text.SetBorder(true).
+		SetTitle(" 🚀  lazyssh ").
+		SetBorderColor(tcell.Color238).
+		SetTitleColor(tcell.Color250)
+
+	// layout to center the card
+	box := tview.NewFlex().SetDirection(tview.FlexRow).
+		AddItem(tview.NewBox(), 0, 1, false).
+		AddItem(text, 9, 0, false).
+		AddItem(tview.NewBox(), 0, 1, false)
+
+	container := tview.NewFlex().SetDirection(tview.FlexColumn).
+		AddItem(tview.NewBox(), 0, 1, false).
+		AddItem(box, 0, 2, false).
+		AddItem(tview.NewBox(), 0, 1, false)
+
+	stop := make(chan struct{})
+	go func() {
+		i := 0
+		for {
+			select {
+			case <-stop:
+				return
+			case <-time.After(90 * time.Millisecond):
+				frame := spinnerFrames[i%len(spinnerFrames)]
+
+				width := 20
+				filled := i % (width + 1)
+				prog := strings.Repeat("█", filled) + strings.Repeat("░", width-filled)
+
+				// rotate tips every ~12 frames
+				i++
+				app.QueueUpdateDraw(func() {
+					text.SetText(
+						"\n" +
+							"[::b]" + title + "[-]\n" +
+							"\n" + frame + "  " + tagline + "\n" +
+							"\n[#55D7FF]" + prog,
+					)
+				})
+			}
+		}
+	}()
+
+	stopFunc := func() { close(stop) }
+	return container, stopFunc
+}