package res

import (
	"path/filepath"
	"strings"
	"testing"
)

func existsIn(paths ...string) func(string) bool {
	set := map[string]bool{}
	for _, p := range paths {
		set[filepath.Clean(p)] = true
	}
	return func(p string) bool { return set[filepath.Clean(p)] }
}

func TestLocate_EnvWins(t *testing.T) {
	got, err := Locate("/opt/custom", "/bin", "/work", existsIn("/opt/custom", "/bin/resources"))
	if err != nil || got != "/opt/custom" {
		t.Fatalf("got %q, %v; want /opt/custom", got, err)
	}
}

func TestLocate_EnvMissingIsError(t *testing.T) {
	_, err := Locate("/nope", "/bin", "/work", existsIn("/bin/resources"))
	if err == nil || !strings.Contains(err.Error(), EnvVar) {
		t.Fatalf("expected error mentioning %s, got %v", EnvVar, err)
	}
}

func TestLocate_ExeDirBeforeCwd(t *testing.T) {
	got, err := Locate("", "/app", "/work", existsIn("/app/resources", "/work/resources"))
	if err != nil || got != filepath.Join("/app", DirName) {
		t.Fatalf("got %q, %v", got, err)
	}
}

func TestLocate_WalksUpFromCwd(t *testing.T) {
	// Som vid `go run`/dlv: binären i en temp-mapp, cwd djupt inne i repot.
	got, err := Locate("", "/tmp/go-build123", "/repo/internal/level", existsIn("/repo/resources"))
	if err != nil || got != filepath.Join("/repo", DirName) {
		t.Fatalf("got %q, %v", got, err)
	}
}

func TestLocate_NothingFound(t *testing.T) {
	_, err := Locate("", "/a", "/b/c", existsIn())
	if err == nil {
		t.Fatal("expected error")
	}
}

// TestDir_RealRepo kör mot det riktiga repot: testet körs med cwd = paketmappen,
// så uppsökningen måste hitta <repo>/resources.
func TestDir_RealRepo(t *testing.T) {
	d, err := Dir()
	if err != nil {
		t.Fatal(err)
	}
	if filepath.Base(d) != DirName {
		t.Fatalf("unexpected dir %q", d)
	}
	if _, err := ReadFile("text", "sv.json"); err != nil {
		t.Fatalf("resources/text/sv.json ska finnas: %v", err)
	}
	var m map[string]string
	if err := LoadJSON(&m, "text", "sv.json"); err != nil {
		t.Fatal(err)
	}
	if m["game.title"] == "" {
		t.Fatal("sv.json saknar game.title")
	}
	if _, err := LoadImage("sprites", "placeholder.png"); err != nil {
		t.Fatal(err)
	}
}