package reference

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

func TestReadUsesBundledSnapshot(t *testing.T) {
	service := NewService(t.TempDir())
	payload, err := service.Read("gpu")
	if err != nil {
		t.Fatal(err)
	}
	if payload["kind"] != "gpu" {
		t.Fatalf("kind = %#v", payload["kind"])
	}
	items, ok := payload["items"].([]any)
	if !ok || len(items) < 10 {
		t.Fatalf("unexpected items: %#v", payload["items"])
	}
}

func TestReadPrefersValidOverride(t *testing.T) {
	root := t.TempDir()
	dir := filepath.Join(root, "reference-data")
	if err := os.MkdirAll(dir, 0o750); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(dir, "cpu-ranking.json"), []byte(`{"schemaVersion":1,"kind":"cpu","version":"override","items":[]}`), 0o640); err != nil {
		t.Fatal(err)
	}
	payload, err := NewService(root).Read("cpu")
	if err != nil {
		t.Fatal(err)
	}
	if payload["version"] != "override" {
		t.Fatalf("version = %#v", payload["version"])
	}
}

func TestReadRejectsUnknownKind(t *testing.T) {
	if _, err := NewService("").Read("unknown"); err != ErrNotFound {
		t.Fatalf("err = %v", err)
	}
}