package inc

import (
	"testing"

	inkwell "git.teletypegames.org/engines/inkwell"
)

func TestScreenNavWrapsBothWays(t *testing.T) {
	g := inkwell.NewGame("t", ScreenW, ScreenH)
	for _, n := range []string{"a", "b", "c"} {
		g.SceneManager.Register(inkwell.Scene{
			Name:       n,
			Background: "bg",
		})
	}
	w := newWorld(g)
	nav := &screenNav{
		Name: "screen_nav",
		W:    w,
	}
	at := func(name string) {
		EnterScene(w, name).Start().Tick(&inkwell.Ctx{
			Game: g,
		})
	}

	for _, tc := range []struct {
		from string
		step int
		want string
	}{
		{
			from: "a",
			step: 1,
			want: "b",
		},
		{
			from: "b",
			step: 1,
			want: "c",
		},
		{
			from: "c",
			step: 1,
			want: "a",
		},
		{
			from: "c",
			step: -1,
			want: "b",
		},
		{
			from: "b",
			step: -1,
			want: "a",
		},
		{
			from: "a",
			step: -1,
			want: "c",
		},
	} {
		at(tc.from)
		if got := nav.neighbour(g, tc.step); got != tc.want {
			t.Errorf("from %q step %+d = %q, want %q", tc.from, tc.step, got, tc.want)
		}
	}
}