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/*
* qtmaildir - a Qt6 mail client for notmuch-indexed Maildirs
* Copyright (C) 2026 Danilo M. <danix@danix.xyz>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#pragma once
#include <QByteArray>
#include <QString>
#include <optional>
/// Every write to the calendar vdir goes through here.
///
/// One function covers create, edit, delete and every undo of those, because
/// each is the same act: the file must currently be X, and must become Y,
/// where either may be "absent". vdirsyncer writes the same files from cron,
/// so "must currently be X" is the stale check that stops a save from
/// silently discarding what a sync just pulled.
namespace CalendarWriter {
enum class Result { Ok, Stale, IoError };
/// `expected` nullopt: the file must not exist. `newText` nullopt: delete it.
/// A write goes to a hidden temporary in the same directory and is renamed
/// into place, so vdirsyncer, which lists only *.ics, never reads half a file.
Result replace(const QString &path, const std::optional<QByteArray> &expected,
const std::optional<QByteArray> &newText, QString *error);
} // namespace CalendarWriter
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