package cmd

// paginateGitea walks pages of a gitea SDK list method until the response
// is short (last page) or we hit limit. limit=0 means unlimited.
//
// Forgejo/Gitea caps PageSize at 50, so naive `PageSize: limit` for limit > 50
// silently truncated results across most `fj * list` commands. This helper
// centralizes the loop so every list command paginates consistently.
//
// fetch is called with (page, pageSize) and returns the items for that page.
// The 1-based `page` matches the gitea SDK convention.
func paginateGitea[T any](limit int, fetch func(page, pageSize int) ([]T, error)) ([]T, error) {
	const maxPageSize = 50
	pageSize := maxPageSize
	if limit > 0 && limit < pageSize {
		pageSize = limit
	}

	var all []T
	for page := 1; ; page++ {
		if limit > 0 && len(all) >= limit {
			break
		}
		batch, err := fetch(page, pageSize)
		if err != nil {
			return all, err
		}
		if len(batch) == 0 {
			break
		}
		all = append(all, batch...)
		// A short page (less than the requested size) is the conventional
		// "you've reached the end" signal — saves one extra round-trip.
		if len(batch) < pageSize {
			break
		}
	}

	if limit > 0 && len(all) > limit {
		all = all[:limit]
	}
	return all, nil
}