/* Copyright 2013 MultiMC Contributors
 *
 * Authors: Andrew Okin
 *          Peterix
 *          Orochimarufan <orochimarufan.x3@gmail.com>
 *
 * 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 <MultiMC.h>

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QMenu>
#include <QMessageBox>
#include <QInputDialog>

#include <QDesktopServices>
#include <QUrl>
#include <QDir>
#include <QFileInfo>
#include <QLabel>
#include <QToolButton>

#include "osutils.h"
#include "userutils.h"
#include "pathutils.h"

#include "categorizedview.h"
#include "categorydrawer.h"

#include "gui/settingsdialog.h"
#include "gui/newinstancedialog.h"
#include "gui/logindialog.h"
#include "gui/ProgressDialog.h"
#include "gui/aboutdialog.h"
#include "gui/versionselectdialog.h"
#include "gui/lwjglselectdialog.h"
#include "gui/consolewindow.h"
#include "gui/instancesettings.h"

#include "logic/lists/InstanceList.h"
#include "logic/lists/MinecraftVersionList.h"
#include "logic/lists/LwjglVersionList.h"
#include "logic/lists/IconList.h"

#include "logic/tasks/LoginTask.h"
#include "logic/BaseInstance.h"
#include "logic/InstanceFactory.h"
#include "logic/MinecraftProcess.h"
#include "logic/OneSixAssets.h"
#include "logic/OneSixUpdate.h"

#include "logic/LegacyInstance.h"

#include "instancedelegate.h"
#include "IconPickerDialog.h"
#include "LabeledToolButton.h"
#include "EditNotesDialog.h"

MainWindow::MainWindow ( QWidget *parent )
	:QMainWindow ( parent ), ui ( new Ui::MainWindow )
{
	ui->setupUi ( this );
	setWindowTitle ( QString ( "MultiMC %1" ).arg ( MMC->version().toString() ) );
	
	// Set the selected instance to null
	m_selectedInstance = nullptr;
	// Set active instance to null.
	m_activeInst = nullptr;
	
	// OSX magic.
	setUnifiedTitleAndToolBarOnMac(true);
	
	// The instance action toolbar customizations
	{
		ui->instanceToolBar->setEnabled(false);
		// the rename label is inside the rename tool button
		renameButton = new LabeledToolButton();
		renameButton->setText("Instance Name");
		renameButton->setToolTip(ui->actionRenameInstance->toolTip());
		connect(renameButton, SIGNAL(clicked(bool)), SLOT(on_actionRenameInstance_triggered()));
		ui->instanceToolBar->insertWidget(ui->actionLaunchInstance, renameButton);
		ui->instanceToolBar->insertSeparator(ui->actionLaunchInstance);
		renameButton->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Preferred);
	}
	
	// Create the instance list widget
	{
		view = new KCategorizedView ( ui->centralWidget );
		drawer = new KCategoryDrawer ( view );
		
		view->setSelectionMode ( QAbstractItemView::SingleSelection );
		view->setCategoryDrawer ( drawer );
		view->setCollapsibleBlocks ( true );
		view->setViewMode ( QListView::IconMode );
		view->setFlow ( QListView::LeftToRight );
		view->setWordWrap(true);
		view->setMouseTracking ( true );
		view->viewport()->setAttribute ( Qt::WA_Hover );
		auto delegate = new ListViewDelegate();
		view->setItemDelegate(delegate);
		view->setSpacing(10);
		view->setUniformItemWidths(true);
		
		// do not show ugly blue border on the mac
		view->setAttribute(Qt::WA_MacShowFocusRect, false);
		
		view->installEventFilter(this);

		proxymodel = new InstanceProxyModel ( this );
		proxymodel->setSortRole ( KCategorizedSortFilterProxyModel::CategorySortRole );
		proxymodel->setFilterRole ( KCategorizedSortFilterProxyModel::CategorySortRole );
		//proxymodel->setDynamicSortFilter ( true );
		
		// FIXME: instList should be global-ish, or at least not tied to the main window... maybe the application itself?
		proxymodel->setSourceModel ( MMC->instances().data() );
		proxymodel->sort ( 0 );
		view->setFrameShape ( QFrame::NoFrame );
		view->setModel ( proxymodel );
		
		ui->horizontalLayout->addWidget ( view );
	}
	// The cat background
	{
		bool cat_enable = MMC->settings()->get("TheCat").toBool();
		ui->actionCAT->setChecked(cat_enable);
		connect(ui->actionCAT, SIGNAL(toggled(bool)), SLOT(onCatToggled(bool)));
		setCatBackground(cat_enable);
	}
	// start instance when double-clicked
	connect(view, SIGNAL(doubleClicked(const QModelIndex &)), this, SLOT(instanceActivated(const QModelIndex &)));
	// track the selection -- update the instance toolbar
	connect(
	        view->selectionModel(),
	        SIGNAL(currentChanged(const QModelIndex &,const QModelIndex &)),
	        this,
	        SLOT(instanceChanged(const QModelIndex &,const QModelIndex &))
	       );
	// model reset -> selection is invalid. All the instance pointers are wrong.
	// FIXME: stop using POINTERS everywhere
	connect(MMC->instances().data() ,SIGNAL(dataIsInvalid()),SLOT(selectionBad()));
	
	// run the things that load and download other things... FIXME: this is NOT the place
	// FIXME: invisible actions in the background = NOPE.
	{
		if (!MMC->minecraftlist()->isLoaded())
		{
			m_versionLoadTask = MMC->minecraftlist()->getLoadTask();
			startTask(m_versionLoadTask);
		}
		if (!MMC->lwjgllist()->isLoaded())
		{
			MMC->lwjgllist()->loadList();
		}
		assets_downloader = new OneSixAssets();
		assets_downloader->start();
	}
}

MainWindow::~MainWindow()
{
	delete ui;
	delete proxymodel;
	delete drawer;
	delete assets_downloader;
}

bool MainWindow::eventFilter ( QObject* obj, QEvent* ev )
{
	if(obj == view)
	{
		if (ev->type() == QEvent::KeyPress)
		{
			QKeyEvent *keyEvent = static_cast<QKeyEvent*>(ev);
			switch(keyEvent->key())
			{
				case Qt::Key_Enter:
				case Qt::Key_Return:
					on_actionLaunchInstance_triggered();
					return true;
				case Qt::Key_Delete:
					on_actionDeleteInstance_triggered();
					return true;
				case Qt::Key_F5:
					on_actionRefresh_triggered();
					return true;
				case Qt::Key_F2:
					on_actionRenameInstance_triggered();
					return true;
				default:
					break;
			}
		}
	}
	return QMainWindow::eventFilter ( obj, ev );
}

void MainWindow::onCatToggled ( bool state )
{
	setCatBackground(state);
	MMC->settings()->set("TheCat", state);
}

void MainWindow::setCatBackground ( bool enabled )
{
	if(enabled)
	{
		view->setStyleSheet(
			"QListView"
			"{"
				"background-image: url(:/backgrounds/kitteh);"
				"background-attachment: fixed;"
				"background-clip: padding;"
				"background-position: top right;"
				"background-repeat: none;"
				"background-color:palette(base);"
			"}"
		);
	}
	else
	{
		view->setStyleSheet(QString());
	}
}


void MainWindow::instanceActivated ( QModelIndex index )
{
	if(!index.isValid())
		return;
	BaseInstance * inst = (BaseInstance *) index.data(InstanceList::InstancePointerRole).value<void *>();
	doLogin();
}

void MainWindow::on_actionAddInstance_triggered()
{
	if (!MMC->minecraftlist()->isLoaded() &&
		m_versionLoadTask && m_versionLoadTask->isRunning())
	{
		QEventLoop waitLoop;
		waitLoop.connect(m_versionLoadTask, SIGNAL(failed(QString)), SLOT(quit()));
		waitLoop.connect(m_versionLoadTask, SIGNAL(succeeded()), SLOT(quit()));
		waitLoop.exec();
	}
	
	NewInstanceDialog newInstDlg( this );
	if (!newInstDlg.exec())
		return;
	
	BaseInstance *newInstance = NULL;
	
	QString instDirName = DirNameFromString(newInstDlg.instName());
	QString instDir = PathCombine(MMC->settings()->get("InstanceDir").toString(), instDirName);
	
	auto &loader = InstanceFactory::get();
	
	auto error = loader.createInstance(newInstance, newInstDlg.selectedVersion(), instDir);
	QString errorMsg = QString("Failed to create instance %1: ").arg(instDirName);
	switch (error)
	{
	case InstanceFactory::NoCreateError:
		newInstance->setName(newInstDlg.instName());
		newInstance->setIconKey(newInstDlg.iconKey());
		MMC->instances()->add(InstancePtr(newInstance));
		return;
	
	case InstanceFactory::InstExists:
		errorMsg += "An instance with the given directory name already exists.";
		QMessageBox::warning(this, "Error", errorMsg);
		break;
		
	case InstanceFactory::CantCreateDir:
		errorMsg += "Failed to create the instance directory.";
		QMessageBox::warning(this, "Error", errorMsg);
		break;
		
	default:
		errorMsg += QString("Unknown instance loader error %1").arg(error);
		QMessageBox::warning(this, "Error", errorMsg);
		break;
	}
}

void MainWindow::on_actionChangeInstIcon_triggered()
{
	if(!m_selectedInstance)
		return;
	
	IconPickerDialog dlg(this);
	dlg.exec(m_selectedInstance->iconKey());
	if(dlg.result() == QDialog::Accepted)
	{
		m_selectedInstance->setIconKey(dlg.selectedIconKey);
		auto ico = MMC->icons()->getIcon(dlg.selectedIconKey);
		ui->actionChangeInstIcon->setIcon(ico);
	}
}


void MainWindow::on_actionChangeInstGroup_triggered()
{
	if(!m_selectedInstance)
		return;
	
	bool ok = false;
	QString name ( m_selectedInstance->group() );
	name = QInputDialog::getText ( this, tr ( "Group name" ), tr ( "Enter a new group name." ),
									QLineEdit::Normal, name, &ok );
	if(ok)
		m_selectedInstance->setGroupPost(name);
}


void MainWindow::on_actionViewInstanceFolder_triggered()
{
	QString str = MMC->settings()->get ( "InstanceDir" ).toString();
	openDirInDefaultProgram ( str );
}

void MainWindow::on_actionRefresh_triggered()
{
	MMC->instances()->loadList();
}

void MainWindow::on_actionViewCentralModsFolder_triggered()
{
	openDirInDefaultProgram ( MMC->settings()->get ( "CentralModsDir" ).toString() , true);
}

void MainWindow::on_actionConfig_Folder_triggered()
{
	if(m_selectedInstance)
	{
		QString str = m_selectedInstance->instanceConfigFolder();
		openDirInDefaultProgram ( QDir(str).absolutePath() );
	}
}


void MainWindow::on_actionCheckUpdate_triggered()
{

}

void MainWindow::on_actionSettings_triggered()
{
	SettingsDialog dialog ( this );
	dialog.exec();
}

void MainWindow::on_actionReportBug_triggered()
{
	openWebPage ( QUrl ( "http://multimc.myjetbrains.com/youtrack/dashboard#newissue=yes" ) );
}

void MainWindow::on_actionNews_triggered()
{
	openWebPage ( QUrl ( "http://forkk.net/tag/multimc.html" ) );
}

void MainWindow::on_actionAbout_triggered()
{
	AboutDialog dialog ( this );
	dialog.exec();
}

void MainWindow::on_mainToolBar_visibilityChanged ( bool )
{
	// Don't allow hiding the main toolbar.
	// This is the only way I could find to prevent it... :/
	ui->mainToolBar->setVisible ( true );
}

void MainWindow::on_actionDeleteInstance_triggered()
{
	if (m_selectedInstance)
	{
		int response = QMessageBox::question(this, "CAREFUL", 
						     QString("This is permanent! Are you sure?\nAbout to delete: ") + m_selectedInstance->name());
		if (response == QMessageBox::Yes)
		{
			m_selectedInstance->nuke();
		}
	}
}

void MainWindow::on_actionRenameInstance_triggered()
{
	if(m_selectedInstance)
	{
		bool ok = false;
		QString name ( m_selectedInstance->name() );
		name = QInputDialog::getText ( this, tr ( "Instance name" ), tr ( "Enter a new instance name." ),
									   QLineEdit::Normal, name, &ok );
		
		if (name.length() > 0)
		{
			if(ok && name.length())
			{
				m_selectedInstance->setName(name);
				renameButton->setText(name);
			}
		}
		
	}
}

void MainWindow::on_actionViewSelectedInstFolder_triggered()
{
	if(m_selectedInstance)
	{
		QString str = m_selectedInstance->instanceRoot();
		openDirInDefaultProgram ( QDir(str).absolutePath() );
	}
}

void MainWindow::on_actionEditInstMods_triggered()
{
	if (m_selectedInstance)
	{
		auto dialog = m_selectedInstance->createModEditDialog(this);
		if(dialog)
			dialog->exec();
		dialog->deleteLater();
	}
}

void MainWindow::closeEvent ( QCloseEvent *event )
{
	// Save the window state and geometry.
	// TODO: Make this work with the new settings system.
//	settings->getConfig().setValue("MainWindowGeometry", saveGeometry());
//	settings->getConfig().setValue("MainWindowState", saveState());
	QMainWindow::closeEvent ( event );
}

void MainWindow::on_instanceView_customContextMenuRequested ( const QPoint &pos )
{
	QMenu *instContextMenu = new QMenu ( "Instance", this );

	// Add the actions from the toolbar to the context menu.
	instContextMenu->addActions ( ui->instanceToolBar->actions() );

	instContextMenu->exec ( view->mapToGlobal ( pos ) );
}

void MainWindow::on_actionLaunchInstance_triggered()
{
	if(m_selectedInstance)
	{
		doLogin();
	}
}

void MainWindow::doLogin(const QString& errorMsg)
{
	if (!m_selectedInstance)
		return;
	
	LoginDialog* loginDlg = new LoginDialog(this, errorMsg);
	if (!m_selectedInstance->lastLaunch())
		loginDlg->forceOnline();
	  
	loginDlg->exec();
	if(loginDlg->result() == QDialog::Accepted)
	{
		if (loginDlg->isOnline()) 
		{
			UserInfo uInfo{loginDlg->getUsername(), loginDlg->getPassword()};

			ProgressDialog* tDialog = new ProgressDialog(this);
			LoginTask* loginTask = new LoginTask(uInfo, tDialog);
			connect(loginTask, SIGNAL(succeeded()),SLOT(onLoginComplete()), Qt::QueuedConnection);
			connect(loginTask, SIGNAL(failed(QString)), SLOT(doLogin(QString)), Qt::QueuedConnection);
			m_activeInst = m_selectedInstance;
			tDialog->exec(loginTask);
		}
		else
		{
			QString user = loginDlg->getUsername();
			if (user.length() == 0)
			  user = QString("Offline");
			m_activeLogin = {user, QString("Offline"), qint64(-1)};
			m_activeInst = m_selectedInstance;
			launchInstance(m_activeInst, m_activeLogin);
		}
	}
}

void MainWindow::onLoginComplete()
{
	if(!m_activeInst)
		return;
	LoginTask * task = (LoginTask *) QObject::sender();
	m_activeLogin = task->getResult();
	
	BaseUpdate *updateTask = m_activeInst->doUpdate();
	if(!updateTask)
	{
		launchInstance(m_activeInst, m_activeLogin);
	}
	else
	{
		ProgressDialog *tDialog = new ProgressDialog(this);
		connect(updateTask, SIGNAL(succeeded()),SLOT(onGameUpdateComplete()));
		connect(updateTask, SIGNAL(failed(QString)), SLOT(onGameUpdateError(QString)));
		tDialog->exec(updateTask);
	}
}

void MainWindow::onGameUpdateComplete()
{
	launchInstance(m_activeInst, m_activeLogin);
}

void MainWindow::onGameUpdateError(QString error)
{
	QMessageBox::warning(this, "Error updating instance", error);
}

void MainWindow::launchInstance(BaseInstance *instance, LoginResponse response)
{
	Q_ASSERT_X(instance != NULL, "launchInstance", "instance is NULL");
	
	proc = instance->prepareForLaunch(response.username, response.sessionID);
	if(!proc)
		return;
	
	// Prepare GUI: If it shall stay open disable the required parts
	if (MMC->settings()->get("NoHide").toBool())
	{
		ui->actionLaunchInstance->setEnabled(false);
	}
	else
	{
		this->hide();
	}
	
	console = new ConsoleWindow(proc);
	console->show();
	connect(proc, SIGNAL(log(QString, MessageLevel::Enum)), 
			console, SLOT(write(QString, MessageLevel::Enum)));
	connect(proc, SIGNAL(ended()), this, SLOT(instanceEnded()));
	proc->setLogin(m_activeLogin.username, m_activeLogin.sessionID);
	proc->launch();
}

void MainWindow::taskStart()
{
	// Nothing to do here yet.
}

void MainWindow::taskEnd()
{
	QObject *sender = QObject::sender();
	if (sender == m_versionLoadTask)
		m_versionLoadTask = NULL;
	
	sender->deleteLater();
}

void MainWindow::startTask(Task *task)
{
	connect(task, SIGNAL(started()), SLOT(taskStart()));
	connect(task, SIGNAL(succeeded()), SLOT(taskEnd()));
	connect(task, SIGNAL(failed(QString)), SLOT(taskEnd()));
	task->start();
}


// Create A Desktop Shortcut
void MainWindow::on_actionMakeDesktopShortcut_triggered()
{
	QString name ( "Test" );
	name = QInputDialog::getText ( this, tr ( "MultiMC Shortcut" ), tr ( "Enter a Shortcut Name." ), QLineEdit::Normal, name );

	Util::createShortCut ( Util::getDesktopDir(), QApplication::instance()->applicationFilePath(), QStringList() << "-dl" << QDir::currentPath() << "test", name, "application-x-octet-stream" );

	QMessageBox::warning ( this, tr("Not useful"), tr("A Dummy Shortcut was created. it will not do anything productive") );
}

// BrowserDialog
void MainWindow::openWebPage ( QUrl url )
{
	QDesktopServices::openUrl(url);
}

void MainWindow::on_actionChangeInstMCVersion_triggered()
{
	if (view->selectionModel()->selectedIndexes().count() < 1)
		return;
	
	VersionSelectDialog vselect(m_selectedInstance->versionList().data(), this);
	if (vselect.exec() && vselect.selectedVersion())
	{
		m_selectedInstance->setIntendedVersionId(vselect.selectedVersion()->descriptor());
	}
}

void MainWindow::on_actionChangeInstLWJGLVersion_triggered()
{
	if (!m_selectedInstance)
		return;
	
	LWJGLSelectDialog lselect(this);
	lselect.exec();
	if (lselect.result() == QDialog::Accepted)
	{
		LegacyInstance * linst = (LegacyInstance *) m_selectedInstance;
		linst->setLWJGLVersion(lselect.selectedVersion());
	}
}

void MainWindow::on_actionInstanceSettings_triggered()
{
	if (view->selectionModel()->selectedIndexes().count() < 1)
		return;

	InstanceSettings settings(&m_selectedInstance->settings(), this);
	settings.setWindowTitle(QString("Instance settings"));
	settings.exec();
}

void MainWindow::instanceChanged( const QModelIndex& current, const QModelIndex& previous )
{
	if(current.isValid() && nullptr != (m_selectedInstance = (BaseInstance *) current.data(InstanceList::InstancePointerRole).value<void *>()))
	{
		ui->instanceToolBar->setEnabled(true);
		QString iconKey = m_selectedInstance->iconKey();
		renameButton->setText(m_selectedInstance->name());
		ui->actionChangeInstLWJGLVersion->setEnabled(m_selectedInstance->menuActionEnabled("actionChangeInstLWJGLVersion"));
		ui->actionEditInstMods->setEnabled(m_selectedInstance->menuActionEnabled("actionEditInstMods"));
		statusBar()->clearMessage();
		statusBar()->showMessage(m_selectedInstance->getStatusbarDescription());
		auto ico =MMC->icons()->getIcon(iconKey);
		ui->actionChangeInstIcon->setIcon(ico);
	}
	else
	{
		selectionBad();
	}
}

void MainWindow::selectionBad()
{
	m_selectedInstance = nullptr;
	QString iconKey = "infinity";
	statusBar()->clearMessage();
	ui->instanceToolBar->setEnabled(false);
	renameButton->setText(tr("Rename Instance"));
	auto ico = MMC->icons()->getIcon(iconKey);
	ui->actionChangeInstIcon->setIcon(ico);
}



void MainWindow::on_actionEditInstNotes_triggered()
{
	if (!m_selectedInstance)
		return;
	LegacyInstance * linst = (LegacyInstance *) m_selectedInstance;
	
	EditNotesDialog noteedit(linst->notes(), linst->name(), this);
	noteedit.exec();
	if (noteedit.result() == QDialog::Accepted)
	{
		
		linst->setNotes(noteedit.getText());
	}
}

void MainWindow::instanceEnded()
{
	this->show();
	ui->actionLaunchInstance->setEnabled(m_selectedInstance);
}