/* SPDX-FileCopyrightText: 2026 Project Tick
 * SPDX-FileContributor: Project Tick
 * SPDX-License-Identifier: GPL-3.0-or-later WITH LicenseRef-MeshMC-MMCO-Module-Exception-1.0
 *
 *   MeshMC - A Custom Launcher for Minecraft
 *   Copyright (C) 2026 Project Tick
 *
 *   This program 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 3 of the License, or
 *   (at your option) any later version, with the additional permission
 *   described in the MeshMC MMCO Module Exception 1.0.
 *
 *   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, see <https://www.gnu.org/licenses/>.
 *
 *   You should have received a copy of the MeshMC MMCO Module Exception 1.0
 *   along with this program.  If not, see <https://projecttick.org/licenses/>.
 *
 *  This file incorporates work covered by the following copyright and
 *  permission notice:
 *
 * Copyright 2013-2021 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <QKeyEvent>
#include <QPushButton>
#include <QFileDialog>

#include "Application.h"

#include "IconPickerDialog.h"
#include "ui_IconPickerDialog.h"

#include "ui/instanceview/InstanceDelegate.h"

#include "icons/IconList.h"
#include "icons/IconUtils.h"
#include <DesktopServices.h>

IconPickerDialog::IconPickerDialog(QWidget* parent)
	: QDialog(parent), ui(new Ui::IconPickerDialog)
{
	ui->setupUi(this);
	setWindowModality(Qt::WindowModal);

	auto contentsWidget = ui->iconView;
	contentsWidget->setViewMode(QListView::IconMode);
	contentsWidget->setFlow(QListView::LeftToRight);
	contentsWidget->setIconSize(QSize(48, 48));
	contentsWidget->setMovement(QListView::Static);
	contentsWidget->setResizeMode(QListView::Adjust);
	contentsWidget->setSelectionMode(QAbstractItemView::SingleSelection);
	contentsWidget->setSpacing(5);
	contentsWidget->setWordWrap(false);
	contentsWidget->setWrapping(true);
	contentsWidget->setUniformItemSizes(true);
	contentsWidget->setTextElideMode(Qt::ElideRight);
	contentsWidget->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
	contentsWidget->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
	contentsWidget->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	contentsWidget->setItemDelegate(new ListViewDelegate());

	// contentsWidget->setAcceptDrops(true);
	contentsWidget->setDropIndicatorShown(true);
	contentsWidget->viewport()->setAcceptDrops(true);
	contentsWidget->setDragDropMode(QAbstractItemView::DropOnly);
	contentsWidget->setDefaultDropAction(Qt::CopyAction);

	contentsWidget->installEventFilter(this);

	contentsWidget->setModel(APPLICATION->icons().get());

	// NOTE: ResetRole forces the button to be on the left, while the OK/Cancel
	// ones are on the right. We win.
	auto buttonAdd =
		ui->buttonBox->addButton(tr("Add Icon"), QDialogButtonBox::ResetRole);
	auto buttonRemove = ui->buttonBox->addButton(tr("Remove Icon"),
												 QDialogButtonBox::ResetRole);

	connect(buttonAdd, &QPushButton::clicked, this,
			&IconPickerDialog::addNewIcon);
	connect(buttonRemove, &QPushButton::clicked, this,
			&IconPickerDialog::removeSelectedIcon);

	connect(contentsWidget, &QListView::doubleClicked, this,
			&IconPickerDialog::activated);

	connect(contentsWidget->selectionModel(),
			&QItemSelectionModel::selectionChanged, this,
			&IconPickerDialog::selectionChanged);

	auto buttonFolder = ui->buttonBox->addButton(tr("Open Folder"),
												 QDialogButtonBox::ResetRole);
	connect(buttonFolder, &QPushButton::clicked, this,
			&IconPickerDialog::openFolder);
}

bool IconPickerDialog::eventFilter(QObject* obj, QEvent* evt)
{
	if (obj != ui->iconView)
		return QDialog::eventFilter(obj, evt);
	if (evt->type() != QEvent::KeyPress) {
		return QDialog::eventFilter(obj, evt);
	}
	QKeyEvent* keyEvent = static_cast<QKeyEvent*>(evt);
	switch (keyEvent->key()) {
		case Qt::Key_Delete:
			removeSelectedIcon();
			return true;
		case Qt::Key_Plus:
			addNewIcon();
			return true;
		default:
			break;
	}
	return QDialog::eventFilter(obj, evt);
}

void IconPickerDialog::addNewIcon()
{
	//: The title of the select icons open file dialog
	QString selectIcons = tr("Select Icons");
	//: The type of icon files
	auto filter = IconUtils::getIconFilter();
	QStringList fileNames = QFileDialog::getOpenFileNames(
		this, selectIcons, QString(), tr("Icons %1").arg(filter));
	APPLICATION->icons()->installIcons(fileNames);
}

void IconPickerDialog::removeSelectedIcon()
{
	APPLICATION->icons()->deleteIcon(selectedIconKey);
}

void IconPickerDialog::activated(QModelIndex index)
{
	selectedIconKey = index.data(Qt::UserRole).toString();
	accept();
}

void IconPickerDialog::selectionChanged(QItemSelection selected,
										QItemSelection deselected)
{
	if (selected.empty())
		return;

	QString key =
		selected.first().indexes().first().data(Qt::UserRole).toString();
	if (!key.isEmpty()) {
		selectedIconKey = key;
	}
}

int IconPickerDialog::execWithSelection(QString selection)
{
	auto list = APPLICATION->icons();
	auto contentsWidget = ui->iconView;
	selectedIconKey = selection;

	int index_nr = list->getIconIndex(selection);
	auto model_index = list->index(index_nr);
	contentsWidget->selectionModel()->select(model_index,
											 QItemSelectionModel::Current |
												 QItemSelectionModel::Select);

	QMetaObject::invokeMethod(this, "delayed_scroll", Qt::QueuedConnection,
							  Q_ARG(QModelIndex, model_index));
	return QDialog::exec();
}

void IconPickerDialog::delayed_scroll(QModelIndex model_index)
{
	auto contentsWidget = ui->iconView;
	contentsWidget->scrollTo(model_index);
}

IconPickerDialog::~IconPickerDialog()
{
	delete ui;
}

void IconPickerDialog::openFolder()
{
	DesktopServices::openDirectory(APPLICATION->icons()->getDirectory(), true);
}
