/*
	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 "conductorpropertieseditorwidget.h"

#include "../QPropertyUndoCommand/qpropertyundocommand.h"
#include "../diagram.h"
#include "../qetgraphicsitem/conductor.h"
#include "conductorpropertieswidget.h"
#include "../qtextorientationspinboxwidget.h"

#include <KColorButton>

#include <QAbstractButton>
#include <QAbstractSpinBox>
#include <QCheckBox>
#include <QComboBox>
#include <QGroupBox>
#include <QLineEdit>
#include <QScrollArea>
#include <QSettings>
#include <QSizePolicy>
#include <QSlider>
#include <QVBoxLayout>

/**
	@brief ConductorPropertiesEditorWidget::ConductorPropertiesEditorWidget
	@param conductor : conductor to edit
	@param parent : parent widget
*/
ConductorPropertiesEditorWidget::ConductorPropertiesEditorWidget(
		Conductor *conductor, QWidget *parent) :
	PropertiesEditorWidget(parent),
	m_cpw(new ConductorPropertiesWidget(this))
{
	// The conductor widget is dialog-sized (min width ~600px), far too wide for
	// a dock. Host it in a scroll area with a small minimum width so the dock
	// can be dragged to any width (a scrollbar appears when narrower than the
	// content). QET already persists dock geometry across restarts via
	// QETDiagramEditor save/restoreState, so the chosen width is remembered.
	// "Apply to all conductors of the potential": same semantics as the modal
	// dialog's checkbox (ConductorPropertiesDialog::applyAll), pinned at the top
	// of the panel so it stays visible above the scrolling tabs (#500). Unlike
	// the dialog the choice is persisted, so a user who always wants it on (or
	// off) sets it once. It is a child of this editor, not of m_cpw, so it is
	// deliberately outside the live-edit signal wiring in connectChangeSignals()
	// (toggling it must not push an edit, only change how the next edit applies).
	// Reuse the modal dialog's exact wording for consistency (and so the
	// existing translation applies).
	m_apply_all_cb = new QCheckBox(
		tr("Appliquer les propriétés à l'ensemble des conducteurs de ce potentiel"),
		this);
	m_apply_all_cb->setChecked(QSettings().value(
		QStringLiteral("diagrameditor/conductor_apply_all"), true).toBool());
	connect(m_apply_all_cb, &QCheckBox::toggled, this, [](bool on) {
		QSettings().setValue(
			QStringLiteral("diagrameditor/conductor_apply_all"), on);
	});

	auto *scroll = new QScrollArea(this);
	scroll->setWidgetResizable(true);
	scroll->setFrameShape(QFrame::NoFrame);
	scroll->setWidget(m_cpw);
	auto *layout = new QVBoxLayout(this);
	layout->setContentsMargins(0, 0, 0, 0);
	layout->addWidget(m_apply_all_cb);
	layout->addWidget(scroll);
	setMinimumWidth(120);
	// Expand vertically to fill the dock like the other editors do (otherwise
	// the panel sits at its small size hint with empty space below it, #500),
	// while keeping a minimum height so it stays usable when the dock is short.
	setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Expanding);
	setMinimumHeight(200);
	setDisabled(true);
	setConductor(conductor);
}

ConductorPropertiesEditorWidget::~ConductorPropertiesEditorWidget()
{}

/**
	@brief ConductorPropertiesEditorWidget::setConductor
	Set (or change) the conductor whose properties are edited.
	@param conductor
*/
void ConductorPropertiesEditorWidget::setConductor(Conductor *conductor)
{
	if (!conductor) return;
	if (m_conductor && m_conductor != conductor)
		disconnect(m_conductor, &Conductor::propertiesChange,
				   this, &ConductorPropertiesEditorWidget::updateUi);
	m_conductor = conductor;
		//Keep the dock in sync when the conductor is edited elsewhere (e.g. the
		//modal "Edit conductor" dialog); otherwise a stale snapshot would be
		//written back on the next apply() and overwrite that change (issue #500).
	connect(m_conductor, &Conductor::propertiesChange,
			this, &ConductorPropertiesEditorWidget::updateUi, Qt::UniqueConnection);
	setEnabled(true);
	updateUi();
}

/**
	@brief ConductorPropertiesEditorWidget::apply
	Push the edit onto the diagram's undo stack.
*/
void ConductorPropertiesEditorWidget::apply()
{
	// Ignore the field-change signals emitted while the widget is being loaded
	// programmatically (updateUi/reset): mid-load the widget holds a partial
	// state that must not be committed onto the conductor.
	if (m_updating) return;
	if (!m_conductor || !m_conductor->diagram()) return;
	if (QUndoCommand *undo = associatedUndo())
		m_conductor->diagram()->undoStack().push(undo);
	m_initial = m_conductor->properties();
}

/**
	@brief ConductorPropertiesEditorWidget::setLiveEdit
	In live-edit mode (how the dock uses every editor), each field change is
	applied immediately instead of via an explicit apply() call. Without this
	override the base class is a no-op and edits in the dock were never applied
	(issue #500).
	@param live_edit true to enable live edit
	@return always true
*/
bool ConductorPropertiesEditorWidget::setLiveEdit(bool live_edit)
{
	if (m_live_edit == live_edit) return true;
	m_live_edit = live_edit;

	if (m_live_edit) connectChangeSignals();
	else             disconnectChangeSignals();

	return true;
}

/**
	@brief ConductorPropertiesEditorWidget::connectChangeSignals
	Wire every editable control of the hosted ConductorPropertiesWidget to
	apply(). Commit-style signals (editingFinished / activated / toggled /
	sliderReleased) are used rather than per-keystroke ones so each edit yields
	a single, clean undo step. Loading the widget programmatically (updateUi)
	also fires some of these, but apply() is a no-op then because
	associatedUndo() returns nullptr when the properties are unchanged.
*/
void ConductorPropertiesEditorWidget::connectChangeSignals()
{
	if (!m_cpw) return;

	const auto add = [this](QMetaObject::Connection c) {
		m_live_connections << c;
	};

	for (auto *w : m_cpw->findChildren<QLineEdit *>())
		add(connect(w, &QLineEdit::editingFinished,
					this, &ConductorPropertiesEditorWidget::apply));
	for (auto *w : m_cpw->findChildren<QAbstractSpinBox *>())
		add(connect(w, &QAbstractSpinBox::editingFinished,
					this, &ConductorPropertiesEditorWidget::apply));
	for (auto *w : m_cpw->findChildren<QComboBox *>())
		add(connect(w, QOverload<int>::of(&QComboBox::activated),
					this, &ConductorPropertiesEditorWidget::apply));
	for (auto *w : m_cpw->findChildren<QSlider *>())
		add(connect(w, &QSlider::sliderReleased,
					this, &ConductorPropertiesEditorWidget::apply));
	for (auto *w : m_cpw->findChildren<KColorButton *>())
		add(connect(w, &KColorButton::changed,
					this, &ConductorPropertiesEditorWidget::apply));
	for (auto *w : m_cpw->findChildren<QTextOrientationSpinBoxWidget *>())
		add(connect(w, QOverload<>::of(&QTextOrientationSpinBoxWidget::editingFinished),
					this, &ConductorPropertiesEditorWidget::apply));
	// Checkboxes and the checkable group boxes (single/multi wire, bicolor…).
	for (auto *w : m_cpw->findChildren<QAbstractButton *>())
		if (w->isCheckable())
			add(connect(w, &QAbstractButton::toggled,
						this, &ConductorPropertiesEditorWidget::apply));
	for (auto *w : m_cpw->findChildren<QGroupBox *>())
		if (w->isCheckable())
			add(connect(w, &QGroupBox::toggled,
						this, &ConductorPropertiesEditorWidget::apply));
}

/**
	@brief ConductorPropertiesEditorWidget::disconnectChangeSignals
	Tear down the live-edit connections made by connectChangeSignals().
*/
void ConductorPropertiesEditorWidget::disconnectChangeSignals()
{
	for (const QMetaObject::Connection &c : m_live_connections)
		disconnect(c);
	m_live_connections.clear();
}

/**
	@brief ConductorPropertiesEditorWidget::reset
	Discard the in-progress edit, restoring the conductor's current properties.
*/
void ConductorPropertiesEditorWidget::reset()
{
	if (!m_conductor) return;
	m_updating = true;
	m_cpw->setProperties(m_initial);
	m_updating = false;
}

/**
	@brief ConductorPropertiesEditorWidget::updateUi
	Reload the widget from the conductor (e.g. when the selection changes).
*/
void ConductorPropertiesEditorWidget::updateUi()
{
	if (!m_conductor) return;
	m_updating = true;
	m_initial = m_conductor->properties();
	m_cpw->setProperties(m_initial);
	m_updating = false;
}

/**
	@brief ConductorPropertiesEditorWidget::associatedUndo
	@return the edit as a QPropertyUndoCommand, or nullptr if unchanged.

	When "apply to all" is ticked, every conductor on the same potential is
	updated in the same undo step (one undo reverts them all), exactly as the
	modal dialog does (ConductorPropertiesDialog::PropertiesDialog). Otherwise
	only the selected conductor is changed.
*/
QUndoCommand *ConductorPropertiesEditorWidget::associatedUndo() const
{
	if (!m_conductor) return nullptr;

	const ConductorProperties new_properties = m_cpw->properties();
	if (new_properties == m_conductor->properties()) return nullptr;

	QVariant old_value, new_value;
	old_value.setValue(m_conductor->properties());
	new_value.setValue(new_properties);

	auto *undo = new QPropertyUndoCommand(
		m_conductor, "properties", old_value, new_value);
	undo->setText(tr("Modifier les propriétés d'un conducteur", "undo caption"));

	// Propagate to every conductor on the same potential, as the modal dialog
	// does: each related conductor becomes a child command of the same undo
	// step, set to the same target properties.
	if (m_apply_all_cb && m_apply_all_cb->isChecked())
	{
		const auto potential = m_conductor->relatedPotentialConductors();
		if (!potential.isEmpty())
		{
			undo->setText(tr("Modifier les propriétés de plusieurs conducteurs",
							  "undo caption"));
			for (Conductor *potential_conductor : potential)
			{
				QVariant old_v;
				old_v.setValue(potential_conductor->properties());
				new QPropertyUndoCommand(
					potential_conductor, "properties", old_v, new_value, undo);
			}
		}
	}
	return undo;
}

/**
	@brief ConductorPropertiesEditorWidget::title
	@return the panel title.
*/
QString ConductorPropertiesEditorWidget::title() const
{
	return tr("Conducteur");
}