package companion

import "testing"

func TestFileSnapshotSequenceStorePersistsMonotonicSequence(t *testing.T) {
	t.Chdir(t.TempDir())
	store, err := NewFileSnapshotSequenceStore(SnapshotSequenceFilename)
	if err != nil {
		t.Fatalf("create sequence store: %v", err)
	}
	first, err := store.Next("players", "current", 100)
	if err != nil || first != 100 {
		t.Fatalf("reserve first sequence: sequence=%d err=%v", first, err)
	}
	restarted, err := NewFileSnapshotSequenceStore(SnapshotSequenceFilename)
	if err != nil {
		t.Fatalf("restart sequence store: %v", err)
	}
	second, err := restarted.Next("players", "current", 1)
	if err != nil || second != 101 {
		t.Fatalf("reserve persisted sequence: sequence=%d err=%v", second, err)
	}
}

func TestFileSnapshotSequenceStoreRejectsHostPaths(t *testing.T) {
	for _, filename := range []string{"../snapshot-sequences.json", "/tmp/snapshot-sequences.json", ""} {
		if _, err := NewFileSnapshotSequenceStore(filename); err == nil {
			t.Fatalf("expected invalid filename rejection: %q", filename)
		}
	}
}