namespace NotesApp.Storage;

// Shared by NoteViewActivity (recomputing its own preview after loading/saving) and
// NoteListActivity (recomputing a row's preview whenever NoteContentCache finishes fetching
// that note's full body) - both need the exact same rules, or the list and the editor would
// disagree on what a note's preview looks like.
public static class NotePreviewBuilder
{
    private const int MaxLength = 300;

    public static string Build(string content)
    {
        var withoutFrontmatter = NoteFrontmatter.StripBlock(content);

        var trimmed =
            withoutFrontmatter.Length > MaxLength
                ? withoutFrontmatter[..MaxLength]
                : withoutFrontmatter;
        var lastNewline = trimmed.LastIndexOf('\n');
        return lastNewline > 0 ? trimmed[..lastNewline] : trimmed;
    }
}