/*
	Copyright 2006-2026 The QElectroTech Team
	This file is part of QElectroTech.

	QElectroTech is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 2 of the License, or
	(at your option) any later version.

	QElectroTech 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 QElectroTech. If not, see <http://www.gnu.org/licenses/>.
*/
#include "elementpickerpopup.h"

#include "elementscollectionwidget.h"

#include <QAction>
#include <QGuiApplication>
#include <QHBoxLayout>
#include <QListWidget>
#include <QMenu>
#include <QPushButton>
#include <QToolButton>
#include <QCloseEvent>
#include <QCursor>
#include <QKeyEvent>
#include <QMouseEvent>
#include <QLabel>
#include <QLineEdit>
#include <QListView>
#include <QScreen>
#include <QSizeGrip>
#include <QStandardItemModel>
#include <QTimer>
#include <QVBoxLayout>
#include <QDir>
#include <QFileInfo>
#include <QSettings>

#include <limits>

#include "../qetapp.h"
#include "../qetpalette.h"
#include "../shortcutmanager.h"
#include "elementpreviewdelegate.h"
#include "elementslocation.h"

	//The palette is read from disk each time the picker opens. It is meant as
	//a shortlist, and a large custom collection would otherwise make opening
	//slow and the grid unusable.
static const int max_palette_entries = 60;

/**
	@brief elementIcon
	@return the element preview @a icon, adapted to @a widget's palette at
	@a size. The shortcut bar and its editor mix these with command icons,
	which already follow the palette through the icon theme, so the
	element icons are adapted once here rather than by an
	ElementPreviewDelegate over the whole list. An item dragged from one
	list to another keeps its adapted icon.
*/
static QIcon elementIcon(const QIcon &icon, const QSize &size, const QWidget *widget)
{
	if (icon.isNull() || !QET::Palette::isDark(widget->palette())) {
		return icon;
	}
	return QIcon(QET::Palette::forPalette(
		icon.pixmap(size, widget->devicePixelRatio()),
		widget->palette()));
}

/**
	@brief ElementPickerPopup::ElementPickerPopup
	@param source : the collection widget whose model the search runs against
	@param parent
*/
ElementPickerPopup::ElementPickerPopup(ElementsCollectionWidget *source,
				       QWidget *parent) :
	QFrame(parent, Qt::Popup),
	m_source(source)
{
	setFrameShape(QFrame::StyledPanel);
	setFrameShadow(QFrame::Raised);
	setMinimumWidth(340);

	auto *layout = new QVBoxLayout(this);
	layout->setContentsMargins(6, 6, 6, 6);
	layout->setSpacing(4);

		//Command row, shown when the picker is opened as the shortcut bar
	m_commands = new QWidget(this);
	m_commands_layout = new QHBoxLayout(m_commands);
	m_commands_layout->setContentsMargins(0, 0, 0, 0);
	m_commands_layout->setSpacing(2);
	m_commands->hide();
		//SolidWorks: right-click the bar to customise it
	m_commands->setContextMenuPolicy(Qt::CustomContextMenu);
	connect(m_commands, &QWidget::customContextMenuRequested, this, [this](const QPoint &pos) {
		QMenu menu;
		menu.addAction(tr("Personnaliser la barre…"), this, &ElementPickerPopup::startCustomising);
		menu.exec(m_commands->mapToGlobal(pos));
	});

		//Customising, shown instead of everything else. Two lists that
		//commands are dragged between: the bar, left to right, and the
		//commands that are not on it.
	m_editor = new QWidget(this);
	auto *editor_layout = new QVBoxLayout(m_editor);
	editor_layout->setContentsMargins(0, 0, 0, 0);
	auto *help = new QLabel(
		tr("Glissez les commandes et les éléments dans la barre, hors de la "
		   "barre, ou d'une place à l'autre. Un double-clic fait passer une "
		   "commande ou un élément d'une liste à l'autre."), m_editor);
	help->setWordWrap(true);
	m_edit_row = new QListWidget(m_editor);
	m_edit_row->setFlow(QListView::LeftToRight);
	m_edit_row->setWrapping(false);
	m_edit_row->setIconSize(QSize(24, 24));
	m_edit_row->setFixedHeight(44);
	m_edit_available = new QListWidget(m_editor);
	m_edit_available->setIconSize(QSize(20, 20));
	m_edit_available->setMinimumHeight(220);
	for (QListWidget *list : {m_edit_row, m_edit_available}) {
		list->setDragDropMode(QAbstractItemView::DragDrop);
		list->setDefaultDropAction(Qt::MoveAction);
		list->setSelectionMode(QAbstractItemView::SingleSelection);
	}
		//A drop copies the item as it was in the other list, so a command
		//dragged onto the bar would keep its text and one dragged off would
		//have none. Set the text for the list it has landed in.
		//Deferred: a drop inserts the row first and copies the item's data
		//into it afterwards.
	auto relabel = [this](QListWidget *list, bool icon_only) {
		return [this, list, icon_only]() {
			QTimer::singleShot(0, this, [list, icon_only]() {
				for (int i = 0 ; i < list->count() ; ++i) {
					QListWidgetItem *item = list->item(i);
					item->setText(icon_only && !item->icon().isNull()
						      ? QString() : item->toolTip());
				}
			});
		};
	};
	connect(m_edit_row->model(), &QAbstractItemModel::rowsInserted,
		this, relabel(m_edit_row, true));
	connect(m_edit_available->model(), &QAbstractItemModel::rowsInserted,
		this, relabel(m_edit_available, false));
		//An element dragged off the bar onto the commands is removed from
		//the bar, not listed as a command
	connect(m_edit_available->model(), &QAbstractItemModel::rowsInserted, this, [this]() {
		QTimer::singleShot(0, this, [this]() {
			for (int i = m_edit_available->count() - 1 ; i >= 0 ; --i) {
				if (ShortcutBarSettings::isElement(
					    m_edit_available->item(i)->data(Qt::UserRole).toString())) {
					delete m_edit_available->takeItem(i);
				}
			}
		});
	});

	connect(m_edit_row, &QListWidget::itemDoubleClicked, this, [this](QListWidgetItem *item) {
		const QString id = item->data(Qt::UserRole).toString();
		delete item;
		if (!ShortcutBarSettings::isElement(id)) {
			m_edit_available->addItem(barItem(id, false));
		}
	});
	connect(m_edit_available, &QListWidget::itemDoubleClicked, this, [this](QListWidgetItem *item) {
		const QString id = item->data(Qt::UserRole).toString();
		delete item;
		m_edit_row->addItem(barItem(id, true));
	});

		//Elements to pin: the same ranked search as the picker, dragged
		//onto the bar. Copied, not moved, so a result can be pinned and
		//still be seen in the list.
	m_edit_symbols_box = new QWidget(m_editor);
	auto *symbols_layout = new QVBoxLayout(m_edit_symbols_box);
	symbols_layout->setContentsMargins(0, 0, 0, 0);
	m_edit_symbols_search = new QLineEdit(m_edit_symbols_box);
	m_edit_symbols_search->setPlaceholderText(tr("Rechercher un élément…"));
	m_edit_symbols_search->setClearButtonEnabled(true);
	m_edit_symbols = new QListWidget(m_edit_symbols_box);
	m_edit_symbols->setIconSize(QSize(32, 32));
	m_edit_symbols->setMinimumHeight(220);
	m_edit_symbols->setDragDropMode(QAbstractItemView::DragOnly);
	m_edit_symbols->setDefaultDropAction(Qt::CopyAction);
	m_edit_symbols->setSelectionMode(QAbstractItemView::SingleSelection);
	symbols_layout->addWidget(new QLabel(tr("Éléments :"), m_edit_symbols_box));
	symbols_layout->addWidget(m_edit_symbols_search);
	symbols_layout->addWidget(m_edit_symbols);

	auto *symbols_timer = new QTimer(this);
	symbols_timer->setSingleShot(true);
	symbols_timer->setInterval(300);
	connect(m_edit_symbols_search, &QLineEdit::textChanged, this,
		[symbols_timer]() { symbols_timer->start(); });
	connect(symbols_timer, &QTimer::timeout, this, &ElementPickerPopup::runSymbolSearch);
	connect(m_edit_symbols, &QListWidget::itemDoubleClicked, this, [this](QListWidgetItem *item) {
		m_edit_row->addItem(barItem(item->data(Qt::UserRole).toString(), true));
	});
	auto *defaults = new QPushButton(tr("Valeurs par défaut"), m_editor);
	auto *cancel = new QPushButton(tr("Annuler"), m_editor);
	auto *done = new QPushButton(tr("Terminé"), m_editor);
	done->setDefault(true);
	connect(defaults, &QPushButton::clicked, this, [this]() {
		fillCustomising(ShortcutBarSettings::defaultIds(m_context));
	});
	connect(cancel, &QPushButton::clicked, this, [this]() { finishCustomising(false); });
	connect(done, &QPushButton::clicked, this, [this]() { finishCustomising(true); });
	auto *editor_buttons = new QHBoxLayout();
	editor_buttons->addWidget(defaults);
	editor_buttons->addStretch();
	editor_buttons->addWidget(cancel);
	editor_buttons->addWidget(done);
	editor_layout->addWidget(help);
	editor_layout->addWidget(new QLabel(tr("Dans la barre :"), m_editor));
	editor_layout->addWidget(m_edit_row);
	auto *lists = new QHBoxLayout();
	auto *commands_column = new QVBoxLayout();
	commands_column->addWidget(new QLabel(tr("Autres commandes :"), m_editor));
	commands_column->addWidget(m_edit_available);
	lists->addLayout(commands_column);
	lists->addWidget(m_edit_symbols_box);
	editor_layout->addLayout(lists);
	editor_layout->addLayout(editor_buttons);
	m_editor->hide();

	m_search = new QLineEdit(this);
	m_search->setPlaceholderText(tr("Rechercher un élément…"));
	m_search->setClearButtonEnabled(true);

	m_model = new QStandardItemModel(this);
	m_view = new QListView(this);
	m_view->setModel(m_model);
		//Element previews are black line art; adapt them to a dark palette
	m_view->setItemDelegate(new ElementPreviewDelegate(m_view));
	m_view->setIconSize(QSize(40, 40));
	m_view->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
	m_view->setEditTriggers(QAbstractItemView::NoEditTriggers);
	m_view->setMinimumHeight(260);

	m_hint = new QLabel(tr("Entrée pour insérer · Échap pour fermer"), this);
	m_hint->setEnabled(false);
		//Wrapped rather than cut off when the bar is made narrow
	m_hint->setWordWrap(true);

		//The bar's width is the user's: dragging the grip wraps the tiles
		//onto more rows, and the width is kept for next time
	m_grip = new QSizeGrip(this);
	m_grip->setToolTip(tr("Glisser pour changer la largeur de la barre"));
	m_grip->installEventFilter(this);
	auto *hint_row = new QHBoxLayout();
	hint_row->addWidget(m_hint, 1);
	hint_row->addWidget(m_grip, 0, Qt::AlignBottom | Qt::AlignRight);

	layout->addWidget(m_commands);
	layout->addWidget(m_search);
	layout->addWidget(m_view);
	layout->addLayout(hint_row);
	layout->addWidget(m_editor);

		//Search as you type, after a short idle: shorter than the dock's
		//500 ms, since the popup is opened and closed in a few seconds, but
		//the collection is large enough that every keystroke would show.
	auto *timer = new QTimer(this);
	timer->setSingleShot(true);
	timer->setInterval(300);
	connect(m_search, &QLineEdit::textChanged, this,
		[timer]() { timer->start(); });
	connect(timer, &QTimer::timeout, this, &ElementPickerPopup::runSearch);

	connect(m_view, &QListView::doubleClicked, this,
		[this](const QModelIndex &) { chooseCurrent(); });
}

/**
	@brief ElementPickerPopup::popUpAt
	Show the picker at @a global_pos, kept on screen, with the search field
	focused and any previous query cleared.
	@param global_pos
*/
void ElementPickerPopup::popUpAt(const QPoint &global_pos)
{
	m_bar_mode = false;
	setCommands({});
	show(global_pos);
}

/**
	@brief ElementPickerPopup::popUpShortcutBar
	Show the picker at @a global_pos with the shortcut bar's commands for
	@a context above it.
	@param global_pos
	@param context
*/
void ElementPickerPopup::popUpShortcutBar(const QPoint &global_pos,
					  ShortcutBarSettings::Context context)
{
	m_bar_mode = true;
	m_context = context;
	setCommands(ShortcutBarSettings::ids(context));
	show(global_pos);
}

/**
	@brief ElementPickerPopup::commandAction
	@return the action registered under @a id by the window this popup
	belongs to, or nullptr
*/
QAction *ElementPickerPopup::commandAction(const QString &id) const
{
	return ShortcutManager::instance().action(id, parentWidget());
}

/**
	@brief ElementPickerPopup::show
	Reset the search and show at @a global_pos, kept on screen.
*/
void ElementPickerPopup::show(const QPoint &global_pos)
{
	m_search->clear();
	m_model->clear();
	showPalette();

	keepOnScreen(global_pos);
	QFrame::show();
	m_search->setFocus();
}

/**
	@brief ElementPickerPopup::keepOnScreen
	Fit the popup to its contents and move it to @a global_pos, kept fully on
	the screen that point is on: opening at the cursor near a right or bottom
	edge would otherwise push it off.
*/
void ElementPickerPopup::keepOnScreen(const QPoint &global_pos)
{
	adjustSize();
		//The sizes the user gave the customising window and the bar
	if (m_customising) {
		const QSize size = ShortcutBarSettings::editorSize();
		if (size.isValid()) {
			resize(size.expandedTo(minimumSizeHint()));
		}
	} else if (m_bar_mode && ShortcutBarSettings::barWidth() > 0) {
		resize(qMax(ShortcutBarSettings::barWidth(), minimumSizeHint().width()),
		       height());
	}
	QPoint pos = global_pos;

	if (QScreen *screen = QGuiApplication::screenAt(global_pos)) {
		const QRect avail = screen->availableGeometry();
		pos.setX(qBound(avail.left(),
				pos.x(), avail.right() - width()));
		pos.setY(qBound(avail.top(),
				pos.y(), avail.bottom() - height()));
	}

	move(pos);
}

/**
	@brief ElementPickerPopup::setCommands
	Show @a ids as a row of buttons above the search field, or hide the row
	when there are none. A disabled command keeps its place, greyed out, so
	the row looks the same every time for a given selection. An id no live
	action carries, or a pinned element that no longer exists, is skipped.

	Clicking a button closes the picker first, then triggers the action: a
	command such as "add a line" starts a mode on the folio, which needs the
	focus the popup holds. A pinned element is placed, as if chosen from the
	picker.
	@param ids : command ids and pinned elements' collection paths
*/
void ElementPickerPopup::setCommands(const QStringList &ids)
{
	while (QLayoutItem *item = m_commands_layout->takeAt(0)) {
		delete item->widget();
		delete item;
	}
	qDeleteAll(m_tiles);
	m_tiles.clear();
	m_tile_rows = new QVBoxLayout();
	m_tile_rows->setSpacing(2);
	m_commands_layout->addLayout(m_tile_rows);

	for (const QString &id : ids)
	{
		if (ShortcutBarSettings::isElement(id))
		{
			const ElementsLocation location(id);
			if (!location.exist()) {
				continue;
			}
			auto *button = new QToolButton(m_commands);
			button->setAutoRaise(true);
			button->setIconSize(QSize(24, 24));
			button->setIcon(elementIcon(location.icon(), QSize(24, 24), this));
			button->setToolTip(location.name());
			button->setFocusPolicy(Qt::NoFocus);
			connect(button, &QToolButton::clicked, this, [this, location]() {
				hide();
				emit elementChosen(location);
			});
			m_tiles << button;
			continue;
		}

		QAction *action = commandAction(id);
		if (!action) {
			continue;
		}
		auto *button = new QToolButton(m_commands);
		button->setAutoRaise(true);
		button->setIconSize(QSize(24, 24));
		const QString text = action->text().remove(QLatin1Char('&'));
		if (action->icon().isNull()) {
			button->setText(text);
			button->setToolButtonStyle(Qt::ToolButtonTextOnly);
		} else {
			button->setIcon(action->icon());
		}
		const QKeySequence key = action->shortcut();
		QString tip = key.isEmpty()
				? text
				: QStringLiteral("%1 (%2)").arg(
					  text, key.toString(QKeySequence::NativeText));
			//The status tip says what the command does, which a short
			//name such as "Orienter les textes" does not
		if (!action->statusTip().isEmpty()) {
			tip += QLatin1Char('\n') + action->statusTip();
		}
		button->setToolTip(tip);
		button->setEnabled(action->isEnabled());
		button->setFocusPolicy(Qt::NoFocus);
		connect(button, &QToolButton::clicked, this, [this, action]() {
			hide();
			action->trigger();
		});
		m_tiles << button;
	}
	m_commands_layout->addStretch();
	if (m_bar_mode)
	{
		auto *customise = new QToolButton(m_commands);
		customise->setAutoRaise(true);
		customise->setText(QStringLiteral("…"));
		customise->setToolTip(tr("Personnaliser la barre…"));
		customise->setFocusPolicy(Qt::NoFocus);
		connect(customise, &QToolButton::clicked, this, &ElementPickerPopup::startCustomising);
		m_commands_layout->addWidget(customise, 0, Qt::AlignTop);
	}
	layoutTiles(ShortcutBarSettings::barWidth());
	m_grip->setVisible(m_bar_mode);
		//An empty bar still shows, so it can be customised back
	m_commands->setVisible(m_bar_mode || !ids.isEmpty());
}

/**
	@brief ElementPickerPopup::layoutTiles
	Put the bar's tiles in rows no wider than the bar at @a bar_width, in
	their order, as many per row as fit. A @a bar_width of 0 or less, the
	width the user never set, keeps them on one row.
*/
void ElementPickerPopup::layoutTiles(int bar_width)
{
	if (!m_tile_rows) {
		return;
	}
		//Emptying a row layout leaves its buttons alone; they go into the
		//new rows below
	while (QLayoutItem *item = m_tile_rows->takeAt(0)) {
		delete item->layout();
	}

		//Room left beside the tiles: the popup's margins and the "…" button
	const int limit = bar_width > 0
			? bar_width - 12 - 30
			: std::numeric_limits<int>::max();
	QHBoxLayout *row = nullptr;
	int used = 0;
	for (QToolButton *tile : std::as_const(m_tiles))
	{
		const int w = tile->sizeHint().width() + m_tile_rows->spacing();
		if (!row || (used + w > limit && used > 0)) {
			row = new QHBoxLayout();
			row->setSpacing(2);
			row->addStretch();
			m_tile_rows->addLayout(row);
			used = 0;
		}
			//Before the stretch, which stays last so the row is left-aligned
		row->insertWidget(row->count() - 1, tile);
		used += w;
	}
}

/**
	@brief ElementPickerPopup::eventFilter
	Drive the size grip by hand. QSizeGrip asks the window manager to do the
	resize, and a popup is a window the window manager does not manage, so
	on X11 nothing would happen. Only the width follows the mouse: the tiles
	re-flow into rows as it changes, the height follows the rows, and the
	width is saved when the grip is let go.
*/
bool ElementPickerPopup::eventFilter(QObject *watched, QEvent *event)
{
	if (watched != m_grip) {
		return QFrame::eventFilter(watched, event);
	}
	switch (event->type())
	{
		case QEvent::MouseButtonPress: {
			auto *me = static_cast<QMouseEvent *>(event);
			if (me->button() != Qt::LeftButton) {
				break;
			}
			m_grip_active = true;
			m_grip_press_x = me->globalPosition().toPoint().x();
			m_grip_press_width = width();
			return true;
		}
		case QEvent::MouseMove: {
			if (!m_grip_active) {
				break;
			}
			auto *me = static_cast<QMouseEvent *>(event);
			const int w = qMax(minimumWidth(), m_grip_press_width
					   + me->globalPosition().toPoint().x() - m_grip_press_x);
			layoutTiles(w);
			layout()->activate();
			resize(w, sizeHint().height());
			return true;
		}
		case QEvent::MouseButtonRelease:
			if (!m_grip_active) {
				break;
			}
			m_grip_active = false;
			ShortcutBarSettings::setBarWidth(width());
			return true;
		default:
			break;
	}
	return QFrame::eventFilter(watched, event);
}

/**
	@brief ElementPickerPopup::barItem
	@return a list item for @a id, a command or a pinned element: icon only,
	for the bar row, or icon and text, for the other lists. The id is in
	UserRole.
*/
QListWidgetItem *ElementPickerPopup::barItem(const QString &id, bool icon_only) const
{
	QString text = id;
	QIcon icon;
	if (ShortcutBarSettings::isElement(id)) {
		const ElementsLocation location(id);
		if (location.exist()) {
			text = location.name();
			icon = elementIcon(location.icon(), QSize(24, 24), this);
		}
	} else if (QAction *action = commandAction(id)) {
		text = action->text().remove(QLatin1Char('&'));
		icon = action->icon();
	}
	auto *item = new QListWidgetItem();
	item->setData(Qt::UserRole, id);
	item->setToolTip(text);
	if (!icon.isNull()) {
		item->setIcon(icon);
	}
	if (!icon_only || item->icon().isNull()) {
		item->setText(text);
	}
	return item;
}

/**
	@brief ElementPickerPopup::startCustomising
	Turn the bar into a small window holding the two lists. A Qt::Popup
	closes as soon as the mouse is pressed outside it and keeps the mouse
	grab during a drag, so the window is re-shown as a tool window for the
	time of the edit.
*/
void ElementPickerPopup::startCustomising()
{
	const QPoint where = pos();
	m_customising = true;
	hide();
	setWindowFlags(Qt::Tool);
	setWindowTitle(tr("Personnaliser la barre de raccourcis : %1")
		       .arg(ShortcutBarSettings::title(m_context)));

	fillCustomising(ShortcutBarSettings::ids(m_context));
	m_commands->hide();
	setPickerVisible(false);
	m_grip->hide();
		//Elements are pinned to the empty-folio bar only: with something
		//selected, the bar is for acting on it, not for adding more
	m_edit_symbols_search->clear();
	m_edit_symbols->clear();
	m_edit_symbols_box->setVisible(m_context == ShortcutBarSettings::Canvas);
	m_editor->show();

	keepOnScreen(where);
	QFrame::show();
	activateWindow();
}

/**
	@brief ElementPickerPopup::fillCustomising
	Put @a ids on the bar row, and every other available command in the
	list below it.
*/
void ElementPickerPopup::fillCustomising(const QStringList &ids)
{
	m_edit_row->clear();
	m_edit_available->clear();
	for (const QString &id : ids) {
		m_edit_row->addItem(barItem(id, true));
	}
	for (const QString &id : ShortcutBarSettings::availableIds()) {
		if (!ids.contains(id)) {
			m_edit_available->addItem(barItem(id, false));
		}
	}
	m_edit_available->sortItems();
}

/**
	@brief ElementPickerPopup::runSymbolSearch
	Fill the customising window's element list with the ranked hits for its
	search field. Elements embedded in a project are left out: their path
	names the project as it is loaded now, so it would not find them again
	in a later session.
*/
void ElementPickerPopup::runSymbolSearch()
{
	m_edit_symbols->clear();
	if (!m_source) {
		return;
	}
	const QVector<ElementSearchHit> hits =
		m_source->rankedSearch(m_edit_symbols_search->text());
	for (const ElementSearchHit &hit : hits)
	{
		if (ElementsLocation(hit.path).isProject()) {
			continue;
		}
		auto *item = new QListWidgetItem(
			elementIcon(hit.icon, m_edit_symbols->iconSize(), this), hit.name);
		item->setData(Qt::UserRole, hit.path);
		item->setToolTip(QStringLiteral("%1\n%2").arg(hit.name, hit.folder));
		m_edit_symbols->addItem(item);
		if (m_edit_symbols->count() >= max_palette_entries) {
			break;
		}
	}
}

/**
	@brief ElementPickerPopup::finishCustomising
	Leave the edit, saving the bar row when @a save, and show the bar again
	at the cursor so the result can be seen and used straight away. The
	window's size is kept either way.
*/
void ElementPickerPopup::finishCustomising(bool save)
{
	if (save)
	{
		QStringList ids;
		for (int i = 0 ; i < m_edit_row->count() ; ++i) {
			ids << m_edit_row->item(i)->data(Qt::UserRole).toString();
		}
		ShortcutBarSettings::setIds(m_context, ids);
	}

	ShortcutBarSettings::setEditorSize(size());
	m_customising = false;
	hide();
	m_editor->hide();
	setPickerVisible(true);
	setWindowFlags(Qt::Popup);
	setWindowTitle(QString());
		//At the cursor, like any other opening of the bar
	popUpShortcutBar(QCursor::pos(), m_context);
}

/**
	@brief ElementPickerPopup::closeEvent
	Closing the customising window from its title bar cancels the edit,
	like the Annuler button, rather than leaving the bar half-edited.
*/
void ElementPickerPopup::closeEvent(QCloseEvent *event)
{
	if (m_customising) {
		event->ignore();
		finishCustomising(false);
		return;
	}
	QFrame::closeEvent(event);
}

/**
	@brief ElementPickerPopup::setPickerVisible
	Show or hide the search field, the results and the hint line.
*/
void ElementPickerPopup::setPickerVisible(bool visible)
{
	m_search->setVisible(visible);
	m_view->setVisible(visible);
	m_hint->setVisible(visible);
}

/**
	@brief ElementPickerPopup::runSearch
*/
void ElementPickerPopup::runSearch()
{
	m_model->clear();
	if (!m_source) {
		return;
	}

	if (m_search->text().isEmpty()) {
		const bool was_hidden = m_view->isHidden();
		showPalette();
		if (was_hidden != m_view->isHidden()) {
			keepOnScreen(pos());
		}
		return;
	}

	if (m_view->isHidden()) {
		m_view->show();
		keepOnScreen(pos());
	}
	m_palette_mode = false;
	m_view->setViewMode(QListView::ListMode);
	m_view->setGridSize(QSize());
	m_view->setIconSize(QSize(40, 40));

	const QVector<ElementSearchHit> hits = m_source->rankedSearch(m_search->text());
	for (const ElementSearchHit &hit : hits)
	{
		auto *item = new QStandardItem(hit.name);
		item->setIcon(hit.icon);
		item->setEditable(false);
		item->setToolTip(hit.folder);
		item->setData(hit.path, Qt::UserRole + 2);
		m_model->appendRow(item);
	}

		//Preselect the best hit so Enter works straight from the search field
		//without arrowing down first -- that is the whole point of the popup.
	if (m_model->rowCount()) {
		m_view->setCurrentIndex(m_model->index(0, 0));
	}
	m_hint->setText(hits.isEmpty()
			? tr("Aucun résultat")
			: tr("Entrée pour insérer · Échap pour fermer"));
}

/**
	@brief ElementPickerPopup::chooseCurrent
	Emit the highlighted element and close.
*/
void ElementPickerPopup::chooseCurrent()
{
	const QModelIndex index = m_view->currentIndex();
	if (!index.isValid()) {
		return;
	}
	const QString path = index.data(Qt::UserRole + 2).toString();
	if (path.isEmpty()) {
		return;
	}

	ElementsLocation location(path);
	if (!location.exist()) {
		return;
	}

		//Close before emitting: placement mode wants the focus, and a popup
		//still up would keep the grab.
	hide();
	emit elementChosen(location);
}

/**
	@brief ElementPickerPopup::keyPressEvent
	Drive the list from the search field, so the hands never leave the
	keyboard: Up/Down move the selection, Enter places, Esc closes.
	@param event
*/
void ElementPickerPopup::keyPressEvent(QKeyEvent *event)
{
	switch (event->key())
	{
		case Qt::Key_Escape:
			if (m_customising) {
				finishCustomising(false);
			} else {
				hide();
			}
			return;
		case Qt::Key_Return:
		case Qt::Key_Enter:
			if (m_customising && m_edit_symbols_search->hasFocus()) {
					//Enter in the element search pins the best hit rather
					//than closing the window. Searched now, not on the
					//timer, so a quick Enter after typing gets this text.
				runSymbolSearch();
				if (QListWidgetItem *item = m_edit_symbols->item(0)) {
					m_edit_row->addItem(barItem(item->data(Qt::UserRole).toString(), true));
				}
			} else if (m_customising) {
				finishCustomising(true);
			} else {
				chooseCurrent();
			}
			return;
		case Qt::Key_Down:
		case Qt::Key_Up:
		case Qt::Key_PageDown:
		case Qt::Key_PageUp:
			if (!m_customising && m_model->rowCount()) {
					//Forwarded rather than focus-switched, so typing carries
					//on going to the search field.
				QCoreApplication::sendEvent(m_view, event);
				return;
			}
			break;
		default:
			break;
	}
	QFrame::keyPressEvent(event);
}

/**
	@brief ElementPickerPopup::showPalette
	With an empty search field, show the quick palette as an icon grid.

	The palette is a folder, not a config file. QET already has a user-owned,
	drag-populated, icon-rendering collection -- so a palette is just a
	directory whose subfolders are categories and whose contents are entries.
	That gives set-up (drag into the folder), ordering (the 01_/02_ filename
	convention the shipped collection already uses), team sharing
	(companyElementsDir) and version control for free, with no schema, parser,
	merge rules or "reset to defaults" to build or maintain.

	Only the path lives in QSettings, defaulting to the user's custom
	collection.
*/
void ElementPickerPopup::showPalette()
{
	m_palette_mode = true;
	m_model->clear();

		//Elements pinned to the bar replace the folder grid: the bar already
		//shows the user's shortlist, and a second one below it is noise.
		//The search still works; the list comes back as soon as one types.
	if (m_bar_mode && ShortcutBarSettings::hasElements(m_context)) {
		m_view->hide();
		m_hint->setText(tr("Tapez pour rechercher un élément · Échap pour fermer"));
		return;
	}
	m_view->show();

	m_view->setViewMode(QListView::IconMode);
	m_view->setIconSize(QSize(48, 48));
	m_view->setGridSize(QSize(92, 84));
	m_view->setResizeMode(QListView::Adjust);
	m_view->setWordWrap(true);
	m_view->setMovement(QListView::Static);

	QSettings settings;
	const QString path = settings.value(
		QStringLiteral("elementscollection/palette-path"),
		QETApp::customElementsDir()).toString();

	const int count = loadPaletteDir(path, QString(), 0);

	if (!count) {
		m_hint->setText(
			tr("Palette vide — glissez des éléments dans votre collection "
			   "personnelle, ou tapez pour rechercher"));
	} else {
		m_hint->setText(tr("Entrée pour insérer · Échap pour fermer"));
		m_view->setCurrentIndex(m_model->index(0, 0));
	}
}

/**
	@brief ElementPickerPopup::loadPaletteDir
	Add every .elmt under @a dir_path to the grid, recursing into subfolders.
	@param dir_path
	@param prefix : folder path so far, shown as the entry's tooltip
	@param depth : recursion guard -- a palette is a shortlist, and the whole
	shipped collection would not be usable as a grid anyway
	@return how many entries were added
*/
int ElementPickerPopup::loadPaletteDir(const QString &dir_path,
				       const QString &prefix, int depth)
{
	if (depth > 3 || m_model->rowCount() >= max_palette_entries) {
		return 0;
	}
	QDir dir(dir_path);
	if (!dir.exists()) {
		return 0;
	}

	int added = 0;
		//Sorted by name, which is what makes the 01_/02_ filename convention
		//work as the ordering mechanism.
	const QFileInfoList entries = dir.entryInfoList(
		QDir::Files | QDir::Dirs | QDir::NoDotAndDotDot, QDir::Name);

	for (const QFileInfo &info : entries)
	{
		if (m_model->rowCount() >= max_palette_entries) {
			break;
		}
		if (info.isDir()) {
			added += loadPaletteDir(info.absoluteFilePath(),
						prefix.isEmpty()
							? info.fileName()
							: prefix + QStringLiteral(" / ")
								+ info.fileName(),
						depth + 1);
			continue;
		}
		if (info.suffix().compare(QStringLiteral("elmt"),
					  Qt::CaseInsensitive) != 0) {
			continue;
		}

		ElementsLocation location(info.absoluteFilePath());
		if (!location.exist()) {
			continue;
		}

		auto *item = new QStandardItem(location.name().isEmpty()
						       ? info.completeBaseName()
						       : location.name());
		item->setIcon(location.icon());
		item->setEditable(false);
		item->setToolTip(prefix.isEmpty() ? info.completeBaseName() : prefix);
		item->setData(info.absoluteFilePath(), Qt::UserRole + 2);
		item->setTextAlignment(Qt::AlignHCenter | Qt::AlignTop);
		m_model->appendRow(item);
		++added;
	}
	return added;
}