/*
 * 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 <QHash>
#include <QList>
#include <QSet>
#include <QString>

#include "htmlbuilder.h"
#include "mimeparser.h"

/// The inline parts of a whole thread, keyed by their namespaced cid.
struct ThreadCidMap
{
    QHash<QString, InlinePart> parts;  ///< For the scheme handler.
    QSet<QString> allowedCids;         ///< For the interceptor. Same keys.
};

/// Flattens every message's inline parts into one namespaced map.
///
/// Two messages in a thread commonly share a Content-ID (cid:logo@example.org
/// from the same sender's newsletter template), and the thread renders as one
/// document, so the raw ids would collide and one message would show another's
/// image. Keys are "<prefix>!<content-id>".
///
/// A cidPrefix containing '!' would break the split that keeps those apart, so
/// it is sanitized here rather than trusted: Q_ASSERT fires in debug builds but
/// is compiled out in release, and this map decides which bytes a message can
/// name. Sanitizing is injective, so two distinct prefixes stay distinct.
ThreadCidMap buildThreadCidMap(const QList<ThreadRenderItem> &items);