/* Copyright 2014 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 "PageDialog.h"
#include "gui/Platform.h"
#include <QStackedLayout>
#include <QPushButton>
#include <QSortFilterProxyModel>
#include "MultiMC.h"
#include <QStyledItemDelegate>
#include <QListView>
#include <QLineEdit>
#include <QLabel>
#include <QDialogButtonBox>
#include <QGridLayout>

#include "PageDialog_p.h"
#include <gui/widgets/IconLabel.h>

class PageEntryFilterModel : public QSortFilterProxyModel
{
public:
	explicit PageEntryFilterModel(QObject *parent = 0) : QSortFilterProxyModel(parent)
	{
	}

protected:
	bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const
	{
		// Regular contents check, then check page-filter.
		if (QSortFilterProxyModel::filterAcceptsRow(sourceRow, sourceParent))
			return true;

		const QString pattern = filterRegExp().pattern();
		const auto model = static_cast<PageModel *>(sourceModel());
		const auto page = model->pages().at(sourceRow);
		return page->shouldDisplay();
	}
};

PageDialog::PageDialog(BasePageProviderPtr pageProvider, QWidget *parent) : QDialog(parent)
{
	MultiMCPlatform::fixWM_CLASS(this);
	createUI();
	setWindowTitle(pageProvider->dialogTitle());

	m_model = new PageModel(this);
	m_proxyModel = new PageEntryFilterModel(this);
	int firstIndex = -1;
	auto pages = pageProvider->getPages();
	for(auto page: pages)
	{
		page->index = m_pageStack->addWidget(dynamic_cast<QWidget *>(page));
		if(firstIndex == -1)
		{
			firstIndex = page->index;
		}
	}
	m_model->setPages(pages);

	m_proxyModel->setSourceModel(m_model);
	m_proxyModel->setFilterCaseSensitivity(Qt::CaseInsensitive);

	m_pageList->setIconSize(QSize(pageIconSize, pageIconSize));
	m_pageList->setSelectionMode(QAbstractItemView::SingleSelection);
	m_pageList->setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
	m_pageList->setModel(m_proxyModel);
    connect(m_pageList->selectionModel(), SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
            this, SLOT(currentChanged(QModelIndex)));
	
	m_pageStack->setStackingMode(QStackedLayout::StackOne);
	m_pageList->setFocus();
}

void PageDialog::createUI()
{
	m_pageStack = new QStackedLayout;
	m_filter = new QLineEdit;
	m_pageList = new PageView;
	m_header = new QLabel();
	m_iconHeader = new IconLabel(this, QIcon::fromTheme("bug"), QSize(24,24));

	QFont headerLabelFont = m_header->font();
	headerLabelFont.setBold(true);
	const int pointSize = headerLabelFont.pointSize();
	if (pointSize > 0)
		headerLabelFont.setPointSize(pointSize + 2);
	m_header->setFont(headerLabelFont);

	QHBoxLayout *headerHLayout = new QHBoxLayout;
	const int leftMargin = MMC->style()->pixelMetric(QStyle::PM_LayoutLeftMargin);
	headerHLayout->addSpacerItem(
		new QSpacerItem(leftMargin, 0, QSizePolicy::Fixed, QSizePolicy::Ignored));
	headerHLayout->addWidget(m_header);
	headerHLayout->addSpacerItem(
		new QSpacerItem(0, 0, QSizePolicy::Expanding, QSizePolicy::Ignored));
	headerHLayout->addWidget(m_iconHeader);

	m_pageStack->setMargin(0);
	m_pageStack->addWidget(new QWidget(this));

	QDialogButtonBox *buttons = new QDialogButtonBox(
		QDialogButtonBox::Ok | QDialogButtonBox::Apply | QDialogButtonBox::Cancel);
	buttons->button(QDialogButtonBox::Ok)->setDefault(true);
	connect(buttons->button(QDialogButtonBox::Apply), SIGNAL(clicked()), this, SLOT(apply()));
	connect(buttons, SIGNAL(accepted()), this, SLOT(accept()));
	connect(buttons, SIGNAL(rejected()), this, SLOT(reject()));

	QGridLayout *mainGridLayout = new QGridLayout;
	mainGridLayout->addLayout(headerHLayout, 0, 1, 1, 1);
	mainGridLayout->addWidget(m_pageList, 0, 0, 2, 1);
	mainGridLayout->addLayout(m_pageStack, 1, 1, 1, 1);
	mainGridLayout->addWidget(buttons, 2, 0, 1, 2);
	mainGridLayout->setColumnStretch(1, 4);
	setLayout(mainGridLayout);
}

void PageDialog::showPage(int row)
{
	auto page = m_model->pages().at(row);
	m_pageStack->setCurrentIndex(page->index);
	m_header->setText(page->displayName());
	m_iconHeader->setIcon(page->icon());
}

void PageDialog::currentChanged(const QModelIndex &current)
{
	if (current.isValid())
	{
		showPage(m_proxyModel->mapToSource(current).row());
	}
	else
	{
		m_pageStack->setCurrentIndex(0);
		m_header->setText(QString());
		m_iconHeader->setIcon(QIcon::fromTheme("bug"));
	}
}

void PageDialog::apply()
{
}