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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 <QObject>
#include <QStringList>
#include <QVector>
#include "types.h"
struct _notmuch_database;
typedef struct _notmuch_database notmuch_database_t;
/// Owns the only notmuch database handle in the process.
///
/// libnotmuch is not thread-safe and queries over a large database block, so
/// this object lives on its own thread and the UI reaches it only through
/// queued signals. No notmuch pointer ever leaves this class.
class NotmuchWorker : public QObject
{
Q_OBJECT
public:
/// notmuchConfigPath may be empty, in which case notmuch resolves its own
/// config and therefore its own database.path.
explicit NotmuchWorker(const QString ¬muchConfigPath, QObject *parent = nullptr);
~NotmuchWorker() override;
/// Threads emitted per threadsReady() signal.
static constexpr int kBatchSize = 200;
public slots:
/// Runs a query. generation lets the UI discard results from a superseded
/// query without the worker needing to know about cancellation.
void runQuery(const QString &query, quint64 generation);
/// Loads the messages of one thread, oldest first. matchQuery is the
/// user's current query; messages matching it render expanded, the rest
/// as stubs.
void loadThread(const QString &threadId, const QString &matchQuery,
quint64 generation);
/// Applies tag changes. Opens the database read-write, applies, and closes
/// immediately: notmuch's write lock is exclusive process-wide, so holding
/// it would block the user's cron `notmuch new`.
void applyTags(const TagChange &change);
/// Batch tagging over whole threads. The UI holds thread ids, not message
/// ids, for rows it has not opened, so the resolution happens here where
/// the database handle lives. This is the path the archive/flag/delete
/// actions use on a multi-row selection.
void applyTagsToThreads(const QStringList &threadIds,
const QStringList &add,
const QStringList &remove,
const QString &description);
signals:
void threadsReady(const QVector<ThreadSummary> &threads, quint64 generation);
void queryFinished(int totalThreads, quint64 generation);
void threadLoaded(const QVector<MessageRef> &messages, quint64 generation);
void tagsApplied(const TagChange &change);
void errorOccurred(const QString &message);
private:
bool openReadOnly();
void close();
QByteArray configPathArg() const;
QString m_configPath;
notmuch_database_t *m_db = nullptr;
};
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