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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 <QList>
#include <QUrl>
#include <QWidget>
#include "htmlbuilder.h"
#include "mimeparser.h"
class QLabel;
class QPushButton;
class QWebEngineView;
class QWebEngineProfile;
class CidSchemeHandler;
class TagColors;
class TagStrip;
class RequestInterceptor;
/// The message pane: thread header, body, attachment bar.
///
/// A whole thread renders into one web view. A newsletter thread can hold
/// dozens of messages, and one view per message would spawn one Chromium
/// render process per message.
class MessageView : public QWidget
{
Q_OBJECT
public:
explicit MessageView(QWidget *parent = nullptr);
~MessageView() override;
/// The base URL every document in this pane is loaded with, and the only
/// qtmaildir: URL the interceptor trusts. Defined once so setHtml() and
/// setDocumentUrl() cannot drift apart: if they ever disagree, the
/// interceptor fails closed and the pane renders nothing at all.
static QUrl documentUrl() { return QUrl(QStringLiteral("qtmaildir://message")); }
/// Renders a whole thread, oldest first. Items whose expanded flag is
/// false collapse to a one-line stub.
void showThread(const QList<ThreadRenderItem> &items);
void showError(const QString &text, const QString &filePath);
void clear();
/// Shows the branded pane used when no thread is displayed.
///
/// Separate from clear(), which still exists and still blanks: clear()
/// drops the previous thread's state, and a caller that wants the
/// placeholder asks for it afterwards. Keeping them apart is what stops
/// the pane flashing a logo between selecting a thread and rendering it,
/// which the item lists as a constraint.
///
/// helpers are already-translated lines; an empty query makes one plain
/// text rather than a link.
void showPlaceholder(const QList<HtmlBuilder::PlaceholderHelper> &helpers);
/// True while the placeholder is what the view is showing. Lets the window
/// re-render it with fresh counts without guessing what is on screen.
bool showingPlaceholder() const { return m_showingPlaceholder; }
/// Supplies the tag strip's colours. Not owned; must outlive the view.
void setTagColors(const TagColors *colours);
/// Tags of the thread on display, shown as chips along the bottom.
void setTags(const QStringList &tags);
/// The full headers of every message in the thread, read-only. Also
/// reachable from the button beside the header; public so the window's
/// message_details action can call it.
///
/// Plain text, not rich: header values are attacker-controlled and this
/// dialog exists to show them verbatim, so the format that cannot
/// interpret markup is the right one.
void showDetailsDialog();
/// The body zoom factor. Chromium's own range is roughly 0.25 to 5.0;
/// these are tighter, since a pane at either extreme is unusable and the
/// only visible way back is a menu entry the user cannot read.
static constexpr qreal kMinZoom = 0.5;
static constexpr qreal kMaxZoom = 3.0;
static constexpr qreal kDefaultZoom = 1.0;
/// Clamps to [kMinZoom, kMaxZoom]. A non-finite or non-positive value,
/// which is what a corrupt state file yields, falls back to kDefaultZoom.
static qreal clampZoom(qreal factor);
qreal zoomFactor() const;
void setZoomFactor(qreal factor);
public slots:
void toggleHtml();
void loadRemoteContent();
void zoomIn();
void zoomOut();
void zoomReset();
signals:
void statusMessage(const QString &text);
/// A helper line on the placeholder was clicked. The window runs the query;
/// the view has no business driving the query bar itself.
///
/// **Gated on the placeholder being what is displayed.** A message body is
/// attacker-controlled HTML and can carry a qtmaildir-query: link as easily
/// as any other; without the gate, clicking one would let a stranger's mail
/// drive the thread list. The consequence is mild (a query runs, nothing is
/// mutated or sent), but "a link in a message does something inside the
/// app" is a boundary worth keeping shut rather than arguing about.
void queryRequested(const QString &query);
protected:
/// Turns Ctrl+wheel over the body into zoom, and Ctrl+middle-click into a
/// reset. Both events are delivered to the web view's internal QQuickWidget
/// focus proxy, not to the view itself, so this filters the whole subtree
/// rather than one widget.
bool eventFilter(QObject *watched, QEvent *event) override;
/// Re-renders when the desktop theme changes.
///
/// The document's colours are baked into its stylesheet at build time, so
/// unlike a widget it does not restyle itself: switching the desktop from
/// light to dark would otherwise leave the open thread on the old palette
/// until the next selection.
void changeEvent(QEvent *event) override;
private:
void render();
void updateHeader();
void setDocument(const QString &html);
/// Rebuilds the attachment bar from m_items. Called from render(), so a
/// toggle between HTML and plain text keeps the bar in step with what is
/// on screen.
///
/// The bar holds ONE button however many attachments a thread carries. A
/// button per file resized the splitter and crushed the thread list on a
/// thread with fifteen of them.
void rebuildAttachmentBar();
/// The list of attachments, with a save button each and a "save all".
void showAttachmentDialog();
/// Saves one attachment, asking for the target directory. Writing goes
/// through Attachment::saveTo(), which is where the path-traversal guard
/// lives; the filename in a message is attacker-controlled.
void saveAttachment(const Attachment &attachment);
/// Saves every attachment into a new subdirectory of a directory the user
/// picks, so fifteen files do not land loose among hundreds of others and
/// cannot collide with what is already there.
void saveAllAttachments();
/// Every attachment in the thread, in the order the messages render.
QList<Attachment> allAttachments() const;
QList<ThreadRenderItem> m_items;
bool m_preferHtml = true;
/// Gates queryRequested(), so a link in a message body cannot run a query.
bool m_showingPlaceholder = false;
QWebEngineProfile *m_profile = nullptr;
QWebEngineView *m_view = nullptr;
RequestInterceptor *m_interceptor = nullptr;
CidSchemeHandler *m_cidHandler = nullptr;
QLabel *m_headerLabel = nullptr;
QLabel *m_blockedLabel = nullptr;
QPushButton *m_loadRemoteButton = nullptr;
QPushButton *m_detailsButton = nullptr;
QWidget *m_attachmentBar = nullptr;
TagStrip *m_tagStrip = nullptr;
};
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