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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 "caltypes.h"
#include "config.h"
#include <QFileSystemWatcher>
#include <QHash>
#include <QMainWindow>
#include <QTimer>
#include <QUndoStack>
#include <optional>
class AgendaView;
class CalendarSync;
class EventPane;
class MonthView;
class QComboBox;
class QLabel;
class QSpinBox;
class QStackedWidget;
class QToolButton;
/// The calendar (item 206): its own top-level window, like ComposeWindow.
/// Spec: docs/superpowers/specs/2026-09-24-calendar-design.md.
class CalendarWindow : public QMainWindow
{
Q_OBJECT
public:
CalendarWindow(const Config &config, const QStringList &ownAddresses,
const QString &uiStatePath, QWidget *parent = nullptr);
~CalendarWindow() override;
void showMonth(int year, int month);
/// Selects an event's occurrence (the first in view when `start` is
/// invalid). False when not found, or refused by the edit lock.
bool selectEvent(const QString &uid, const QDateTime &start = {});
QString selectedUid() const;
bool isEditing() const;
QUndoStack *undoStack() { return &m_undo; }
/// One file's before and after, either absent. What a write and its undo
/// are made of.
struct Change
{
QString path;
std::optional<QByteArray> before;
std::optional<QByteArray> after;
};
/// Applies `changes` in order through CalendarWriter. On a failure the
/// ones already applied are rolled back and the reason is reported.
bool applyChanges(const QList<Change> &changes, bool reverse);
protected:
void closeEvent(QCloseEvent *event) override;
private:
void buildUi();
void buildActions();
void reload();
void rebuildItems();
void refreshToolbar();
void select(int item);
void startEdit();
void startNew(const QDate &day);
QDate defaultNewDay() const;
bool save();
void cancelEdit();
void deleteSelected();
bool writeAndRecord(const QString &label, const QList<Change> &changes);
void checkAfterSync();
const CalCollection *collection(const QString &dir) const;
QList<CalCollection> writableCollections() const;
QString defaultCollection() const;
void status(const QString &text);
Config m_config;
QStringList m_ownAddresses;
QString m_uiStatePath;
LoadResult m_data;
QList<CalendarItem> m_items;
int m_year;
int m_month;
int m_selected = -1;
QString m_selectedUid; ///< survives a reload
QDateTime m_selectedStart;
// The open edit. m_editPath empty with m_editing: a new event.
QString m_editPath;
QByteArray m_editBase;
bool m_editWholeSeries = true;
QDateTime m_editRecurrenceId;
QUndoStack m_undo;
CalendarSync *m_sync;
QFileSystemWatcher m_watcher;
QTimer m_reloadTimer;
/// Written since the last sync started: path to the text written, or
/// nullopt for a deletion. Checked by meaning after the next sync.
QHash<QString, std::optional<QByteArray>> m_written;
QHash<QString, std::optional<QByteArray>> m_checking;
QComboBox *m_collectionBox;
QComboBox *m_monthBox;
QSpinBox *m_yearSpin;
QToolButton *m_monthButton;
QToolButton *m_agendaButton;
QStackedWidget *m_views;
MonthView *m_monthView;
AgendaView *m_agendaView;
EventPane *m_pane;
QLabel *m_dataWarning;
};
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