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diff --git a/src/caltypes.h b/src/caltypes.h
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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 "repeatrule.h"
+
+#include <QByteArray>
+#include <QColor>
+#include <QDateTime>
+#include <QList>
+#include <QString>
+
+/// One vdir collection: a subdirectory of calendars_dir.
+struct CalCollection
+{
+    QString dir;          ///< The directory's own name, e.g. "52".
+    QString path;         ///< Absolute path.
+    /// From the vdir's `displayname` file, which vdirsyncer's metasync fills
+    /// from the server; the directory name when absent.
+    QString displayName;
+    /// From the vdir's `color` file (`#RRGGBB`); a colour hashed from the
+    /// directory name when absent, so no collection is ever invisible.
+    QColor color;
+    bool readOnly = false;  ///< The directory is not writable.
+};
+
+struct CalPerson
+{
+    QString name;      ///< CN, possibly empty.
+    QString address;   ///< The address with "mailto:" removed.
+    QString partstat;  ///< PARTSTAT as written, e.g. "ACCEPTED"; empty if absent.
+};
+
+/// A RECURRENCE-ID override: one occurrence of a series moved or changed.
+struct CalOverride
+{
+    QDateTime recurrenceId;  ///< The original slot it replaces.
+    QDateTime start;
+    QDateTime end;
+    bool allDay = false;
+    QString summary;
+    QString location;
+    QString description;
+    bool cancelled = false;  ///< STATUS:CANCELLED: the slot is removed.
+};
+
+/// One .ics file's event, as the rest of the application sees it.
+struct CalEvent
+{
+    QString filePath;
+    QString collectionDir;
+    QString uid;
+    QString summary;
+    QString location;
+    QString description;
+    QDateTime start;
+    QDateTime end;   ///< Exclusive. For an all-day event, midnight after the last day.
+    bool allDay = false;
+    RepeatRule repeat;  ///< Freq::None when the event does not repeat.
+    QList<QDateTime> exdates;
+    QList<CalOverride> overrides;
+    bool hasAlarm = false;
+    CalPerson organizer;  ///< Empty address: no ORGANIZER.
+    QList<CalPerson> attendees;
+    int sequence = 0;
+    QByteArray rawText;  ///< The file exactly as read: stale checks and undo.
+};
+
+/// One expanded occurrence. What a view is built from.
+struct Occurrence
+{
+    int eventIndex = -1;       ///< Into LoadResult::events.
+    QDateTime start;
+    QDateTime end;
+    bool allDay = false;
+    /// The slot this occurrence fills in its series, which is what a
+    /// RECURRENCE-ID or an EXDATE names. Invalid for a non-repeating event.
+    QDateTime recurrenceId;
+    bool isOverride = false;
+    int overrideIndex = -1;    ///< Into CalEvent::overrides when isOverride.
+};
+
+/// An occurrence plus what a view draws. Views see nothing else.
+struct CalendarItem
+{
+    Occurrence occurrence;
+    QString title;
+    QColor color;
+};
+
+/// What the edit form produces.
+struct EventEdit
+{
+    QString summary;
+    QString location;
+    QString description;
+    QDateTime start;
+    QDateTime end;
+    bool allDay = false;
+    RepeatRule repeat;
+    QString collectionDir;
+};
+
+struct LoadResult
+{
+    QList<CalCollection> collections;
+    QList<CalEvent> events;
+    int unparsable = 0;     ///< Files skipped because they did not parse.
+    int unknownZones = 0;   ///< Events whose TZID resolved to nothing, shown in local time.
+};