package braille

import (
	"reflect"
	"testing"
)

func TestLineComposesFocusedRegionWithoutChangingSpacing(t *testing.T) {
	line := Line{Regions: []Region{
		{Text: "Context "},
		{Text: "é界", Cursor: 1},
		{Text: " entry"},
	}, Focus: 1}
	frame, err := line.Frame()
	if err != nil || !reflect.DeepEqual(frame, Frame{Text: "Context é界 entry", Cursor: 9}) {
		t.Fatalf("frame=%+v err=%v", frame, err)
	}
	line.Focus = -1
	frame, err = line.Frame()
	if err != nil || frame.Cursor != -1 {
		t.Fatalf("unfocused frame=%+v err=%v", frame, err)
	}
}

func TestLineRejectsInvalidFocusAndCursor(t *testing.T) {
	for _, line := range []Line{
		{Focus: 0},
		{Regions: []Region{{Text: "x"}}, Focus: -2},
		{Regions: []Region{{Text: "x", Cursor: 2}}, Focus: 0},
	} {
		if _, err := line.Frame(); err == nil {
			t.Fatalf("accepted invalid line %+v", line)
		}
	}
}