package runner

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

// The bank read-out is opened at the path the ENGINE published (`artifacts.bank_export`, row 213) —
// the derivation from `book.yaml` that used to live here copied another zone's path convention and
// is gone with this pin's previous edition.
//
// Mutation caught: treating an empty published path as "no bank yet" — on an engine build from
// before the envelope that would silently stop every bank refresh, so it must refuse loudly instead.
func TestTheBankIsReadAtThePathTheEnginePublished(t *testing.T) {
	dir := t.TempDir()
	path := filepath.Join(dir, "sample-zh.db.bank.json")
	if _, err := ReadBank(path); !errors.Is(err, ErrNoBank) {
		t.Fatalf("a published place with no file yet answered %v, want ErrNoBank", err)
	}
	if err := os.WriteFile(path, []byte(`{"bank_version":"tm-bank-v1","book_id":"sample-zh","terms":[]}`), 0o644); err != nil {
		t.Fatal(err)
	}
	if _, err := ReadBank(path); err != nil {
		t.Fatalf("the read-out at the published path: %v", err)
	}
	if _, err := ReadBank(""); err == nil || errors.Is(err, ErrNoBank) {
		t.Errorf("an empty published path answered %v, want a loud refusal naming the missing envelope", err)
	}
}