package eprel

import (
	"context"
	"testing"
)

// stubFetcher verifies the Fetcher interface is usable from processing tests.
type stubFetcher struct {
	enabled bool
	data    *Data
	err     error
	calls   int
	lastID  string
}

func (s *stubFetcher) Enabled() bool { return s.enabled }

func (s *stubFetcher) Fetch(_ context.Context, id string) (*Data, error) {
	s.calls++
	s.lastID = id
	return s.data, s.err
}

func TestFetcherInterface(t *testing.T) {
	var _ Fetcher = (*Client)(nil)
	var _ Fetcher = Disabled{}
	var _ Fetcher = (*stubFetcher)(nil)

	st := &stubFetcher{enabled: true, data: &Data{ID: "1", Label: "L"}}
	got, err := st.Fetch(context.Background(), "1")
	if err != nil || got.ID != "1" || st.calls != 1 {
		t.Fatalf("stub: %#v err=%v", got, err)
	}
}