package ui

import (
	"testing"
	"time"

	"github.com/gdamore/tcell/v2"
	"github.com/rivo/tview"
)

// Pressing Down in an empty table used to loop forever in tview because the
// placeholder row is not selectable.
func TestEmptyTableDownDoesNotHang(t *testing.T) {
	tbl := tview.NewTable().SetSelectable(true, false).SetFixed(1, 0)
	restoreSelection(tbl, 0, 0, "empty")

	screen := tcell.NewSimulationScreen("")
	if err := screen.Init(); err != nil {
		t.Fatal(err)
	}
	defer screen.Fini()
	screen.SetSize(80, 10)
	tbl.SetRect(0, 0, 80, 10)

	done := make(chan struct{})
	go func() {
		tbl.Draw(screen)
		tbl.InputHandler()(tcell.NewEventKey(tcell.KeyDown, 0, 0), func(tview.Primitive) {})
		tbl.InputHandler()(tcell.NewEventKey(tcell.KeyUp, 0, 0), func(tview.Primitive) {})
		tbl.Draw(screen)
		close(done)
	}()
	select {
	case <-done:
	case <-time.After(2 * time.Second):
		t.Fatal("table input handler hung on an empty table")
	}
}