package editor

import "testing"

// TASK-004: vertical motion must not rescan + rewrap the whole document twice.
// buildVisual is O(document); one keystroke should trigger at most one scan.

func setupDoc(t *testing.T) *Editor {
	t.Helper()
	e := New()
	e.SetContent([]byte("line one\nline two\nline three\nline four"))
	e.SetSize(80, 24)
	return e
}

func TestMoveDownBuildsVisualOnce(t *testing.T) {
	e := setupDoc(t)
	e.buildCount = 0
	e.MoveDown()
	if e.buildCount > 1 {
		t.Errorf("MoveDown built visual %d times, want <= 1", e.buildCount)
	}
}

func TestMoveUpBuildsVisualOnce(t *testing.T) {
	e := setupDoc(t)
	e.MoveDocEnd()
	e.buildCount = 0
	e.MoveUp()
	if e.buildCount > 1 {
		t.Errorf("MoveUp built visual %d times, want <= 1", e.buildCount)
	}
}

func TestMoveToVisualBuildsVisualOnce(t *testing.T) {
	e := setupDoc(t)
	e.buildCount = 0
	e.MoveToVisual(2, 1)
	if e.buildCount > 1 {
		t.Errorf("MoveToVisual built visual %d times, want <= 1", e.buildCount)
	}
}