/* Copyright 2013-2017 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 "MultiMCPage.h"
#include "ui_MultiMCPage.h"

#include <QFileDialog>
#include <QMessageBox>
#include <QDir>
#include <QTextCharFormat>

#include "updater/UpdateChecker.h"

#include "settings/SettingsObject.h"
#include <FileSystem.h>
#include "MultiMC.h"
#include "BuildConfig.h"
#include "themes/ITheme.h"

// FIXME: possibly move elsewhere
enum InstSortMode
{
	// Sort alphabetically by name.
	Sort_Name,
	// Sort by which instance was launched most recently.
	Sort_LastLaunch
};

MultiMCPage::MultiMCPage(QWidget *parent) : QWidget(parent), ui(new Ui::MultiMCPage)
{
	ui->setupUi(this);
	auto origForeground = ui->fontPreview->palette().color(ui->fontPreview->foregroundRole());
	auto origBackground = ui->fontPreview->palette().color(ui->fontPreview->backgroundRole());
	m_colors.reset(new LogColorCache(origForeground, origBackground));

	ui->sortingModeGroup->setId(ui->sortByNameBtn, Sort_Name);
	ui->sortingModeGroup->setId(ui->sortLastLaunchedBtn, Sort_LastLaunch);

	defaultFormat = new QTextCharFormat(ui->fontPreview->currentCharFormat());

	m_languageModel = MMC->translations();
	loadSettings();

	if(BuildConfig.UPDATER_ENABLED)
	{
		QObject::connect(MMC->updateChecker().get(), &UpdateChecker::channelListLoaded, this,
						&MultiMCPage::refreshUpdateChannelList);

		if (MMC->updateChecker()->hasChannels())
		{
			refreshUpdateChannelList();
		}
		else
		{
			MMC->updateChecker()->updateChanList(false);
		}
	}
	else
	{
		ui->updateSettingsBox->setHidden(true);
	}
	// Analytics
	if(BuildConfig.ANALYTICS_ID.isEmpty())
	{
		ui->tabWidget->removeTab(ui->tabWidget->indexOf(ui->analyticsTab));
	}
	connect(ui->fontSizeBox, SIGNAL(valueChanged(int)), SLOT(refreshFontPreview()));
	connect(ui->consoleFont, SIGNAL(currentFontChanged(QFont)), SLOT(refreshFontPreview()));
	connect(ui->languageBox, SIGNAL(currentIndexChanged(int)), SLOT(languageIndexChanged(int)));
}

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

bool MultiMCPage::apply()
{
	applySettings();
	return true;
}

void MultiMCPage::on_instDirBrowseBtn_clicked()
{
	QString raw_dir = QFileDialog::getExistingDirectory(this, tr("Instance Folder"), ui->instDirTextBox->text());

	// do not allow current dir - it's dirty. Do not allow dirs that don't exist
	if (!raw_dir.isEmpty() && QDir(raw_dir).exists())
	{
		QString cooked_dir = FS::NormalizePath(raw_dir);
		if (FS::checkProblemticPathJava(QDir(cooked_dir)))
		{
			QMessageBox warning;
			warning.setText(tr("You're trying to specify an instance folder which\'s path "
							   "contains at least one \'!\'. "
							   "Java is known to cause problems if that is the case, your "
							   "instances (probably) won't start!"));
			warning.setInformativeText(
				tr("Do you really want to use this path? "
				   "Selecting \"No\" will close this and not alter your instance path."));
			warning.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
			int result = warning.exec();
			if (result == QMessageBox::Yes)
			{
				ui->instDirTextBox->setText(cooked_dir);
			}
		}
		else
		{
			ui->instDirTextBox->setText(cooked_dir);
		}
	}
}

void MultiMCPage::on_iconsDirBrowseBtn_clicked()
{
	QString raw_dir = QFileDialog::getExistingDirectory(this, tr("Icons Folder"), ui->iconsDirTextBox->text());

	// do not allow current dir - it's dirty. Do not allow dirs that don't exist
	if (!raw_dir.isEmpty() && QDir(raw_dir).exists())
	{
		QString cooked_dir = FS::NormalizePath(raw_dir);
		ui->iconsDirTextBox->setText(cooked_dir);
	}
}
void MultiMCPage::on_modsDirBrowseBtn_clicked()
{
	QString raw_dir = QFileDialog::getExistingDirectory(this, tr("Mods Folder"), ui->modsDirTextBox->text());

	// do not allow current dir - it's dirty. Do not allow dirs that don't exist
	if (!raw_dir.isEmpty() && QDir(raw_dir).exists())
	{
		QString cooked_dir = FS::NormalizePath(raw_dir);
		ui->modsDirTextBox->setText(cooked_dir);
	}
}

void MultiMCPage::languageIndexChanged(int index)
{
	auto languageCode = ui->languageBox->itemData(ui->languageBox->currentIndex()).toString();
	if(languageCode.isEmpty())
	{
		qWarning() << "Unknown language at index" << index;
		return;
	}
	auto translations = MMC->translations();
	translations->selectLanguage(languageCode);
	translations->updateLanguage(languageCode);
}

void MultiMCPage::refreshUpdateChannelList()
{
	// Stop listening for selection changes. It's going to change a lot while we update it and
	// we don't need to update the
	// description label constantly.
	QObject::disconnect(ui->updateChannelComboBox, SIGNAL(currentIndexChanged(int)), this,
						SLOT(updateChannelSelectionChanged(int)));

	QList<UpdateChecker::ChannelListEntry> channelList = MMC->updateChecker()->getChannelList();
	ui->updateChannelComboBox->clear();
	int selection = -1;
	for (int i = 0; i < channelList.count(); i++)
	{
		UpdateChecker::ChannelListEntry entry = channelList.at(i);

		// When it comes to selection, we'll rely on the indexes of a channel entry being the
		// same in the
		// combo box as it is in the update checker's channel list.
		// This probably isn't very safe, but the channel list doesn't change often enough (or
		// at all) for
		// this to be a big deal. Hope it doesn't break...
		ui->updateChannelComboBox->addItem(entry.name);

		// If the update channel we just added was the selected one, set the current index in
		// the combo box to it.
		if (entry.id == m_currentUpdateChannel)
		{
			qDebug() << "Selected index" << i << "channel id" << m_currentUpdateChannel;
			selection = i;
		}
	}

	ui->updateChannelComboBox->setCurrentIndex(selection);

	// Start listening for selection changes again and update the description label.
	QObject::connect(ui->updateChannelComboBox, SIGNAL(currentIndexChanged(int)), this,
					 SLOT(updateChannelSelectionChanged(int)));
	refreshUpdateChannelDesc();

	// Now that we've updated the channel list, we can enable the combo box.
	// It starts off disabled so that if the channel list hasn't been loaded, it will be
	// disabled.
	ui->updateChannelComboBox->setEnabled(true);
}

void MultiMCPage::updateChannelSelectionChanged(int index)
{
	refreshUpdateChannelDesc();
}

void MultiMCPage::refreshUpdateChannelDesc()
{
	// Get the channel list.
	QList<UpdateChecker::ChannelListEntry> channelList = MMC->updateChecker()->getChannelList();
	int selectedIndex = ui->updateChannelComboBox->currentIndex();
	if (selectedIndex < 0)
	{
		return;
	}
	if (selectedIndex < channelList.count())
	{
		// Find the channel list entry with the given index.
		UpdateChecker::ChannelListEntry selected = channelList.at(selectedIndex);

		// Set the description text.
		ui->updateChannelDescLabel->setText(selected.description);

		// Set the currently selected channel ID.
		m_currentUpdateChannel = selected.id;
	}
}

void MultiMCPage::applySettings()
{
	auto s = MMC->settings();

	// Language
	s->set("Language", ui->languageBox->itemData(ui->languageBox->currentIndex()).toString());

	if (ui->resetNotificationsBtn->isChecked())
	{
		s->set("ShownNotifications", QString());
	}

	// Updates
	s->set("AutoUpdate", ui->autoUpdateCheckBox->isChecked());
	s->set("UpdateChannel", m_currentUpdateChannel);
	auto original = s->get("IconTheme").toString();
	//FIXME: make generic
	switch (ui->themeComboBox->currentIndex())
	{
	case 1:
		s->set("IconTheme", "pe_dark");
		break;
	case 2:
		s->set("IconTheme", "pe_light");
		break;
	case 3:
		s->set("IconTheme", "pe_blue");
		break;
	case 4:
		s->set("IconTheme", "pe_colored");
		break;
	case 5:
		s->set("IconTheme", "OSX");
		break;
	case 6:
		s->set("IconTheme", "iOS");
		break;
	case 7:
		s->set("IconTheme", "flat");
		break;
	case 8:
		s->set("IconTheme", "custom");
		break;
	case 0:
	default:
		s->set("IconTheme", "multimc");
		break;
	}

	if(original != s->get("IconTheme"))
	{
		MMC->setIconTheme(s->get("IconTheme").toString());
	}

	auto originalAppTheme = s->get("ApplicationTheme").toString();
	auto newAppTheme = ui->themeComboBoxColors->currentData().toString();
	if(originalAppTheme != newAppTheme)
	{
		s->set("ApplicationTheme", newAppTheme);
		MMC->setApplicationTheme(newAppTheme, false);
	}

	// Console settings
	s->set("ShowConsole", ui->showConsoleCheck->isChecked());
	s->set("AutoCloseConsole", ui->autoCloseConsoleCheck->isChecked());
	s->set("ShowConsoleOnError", ui->showConsoleErrorCheck->isChecked());
	QString consoleFontFamily = ui->consoleFont->currentFont().family();
	s->set("ConsoleFont", consoleFontFamily);
	s->set("ConsoleFontSize", ui->fontSizeBox->value());
	s->set("ConsoleMaxLines", ui->lineLimitSpinBox->value());
	s->set("ConsoleOverflowStop", ui->checkStopLogging->checkState() != Qt::Unchecked);

	// Folders
	// TODO: Offer to move instances to new instance folder.
	s->set("InstanceDir", ui->instDirTextBox->text());
	s->set("CentralModsDir", ui->modsDirTextBox->text());
	s->set("IconsDir", ui->iconsDirTextBox->text());

	auto sortMode = (InstSortMode)ui->sortingModeGroup->checkedId();
	switch (sortMode)
	{
	case Sort_LastLaunch:
		s->set("InstSortMode", "LastLaunch");
		break;
	case Sort_Name:
	default:
		s->set("InstSortMode", "Name");
		break;
	}

	// Analytics
	if(!BuildConfig.ANALYTICS_ID.isEmpty())
	{
		s->set("Analytics", ui->analyticsCheck->isChecked());
	}
}
void MultiMCPage::loadSettings()
{
	auto s = MMC->settings();
	// Language
	{
		ui->languageBox->setModel(m_languageModel.get());
		ui->languageBox->setCurrentIndex(ui->languageBox->findData(s->get("Language").toString()));
	}

	// Updates
	ui->autoUpdateCheckBox->setChecked(s->get("AutoUpdate").toBool());
	m_currentUpdateChannel = s->get("UpdateChannel").toString();
	//FIXME: make generic
	auto theme = s->get("IconTheme").toString();
	if (theme == "pe_dark")
	{
		ui->themeComboBox->setCurrentIndex(1);
	}
	else if (theme == "pe_light")
	{
		ui->themeComboBox->setCurrentIndex(2);
	}
	else if (theme == "pe_blue")
	{
		ui->themeComboBox->setCurrentIndex(3);
	}
	else if (theme == "pe_colored")
	{
		ui->themeComboBox->setCurrentIndex(4);
	}
	else if (theme == "OSX")
	{
		ui->themeComboBox->setCurrentIndex(5);
	}
	else if (theme == "iOS")
	{
		ui->themeComboBox->setCurrentIndex(6);
	}
	else if (theme == "flat")
	{
		ui->themeComboBox->setCurrentIndex(7);
	}
	else if (theme == "custom")
	{
		ui->themeComboBox->setCurrentIndex(8);
	}
	else
	{
		ui->themeComboBox->setCurrentIndex(0);
	}

	{
		auto currentTheme = s->get("ApplicationTheme").toString();
		auto themes = MMC->getValidApplicationThemes();
		int idx = 0;
		for(auto &theme: themes)
		{
			ui->themeComboBoxColors->addItem(theme->name(), theme->id());
			if(currentTheme == theme->id())
			{
				ui->themeComboBoxColors->setCurrentIndex(idx);
			}
			idx++;
		}
	}

	// Console settings
	ui->showConsoleCheck->setChecked(s->get("ShowConsole").toBool());
	ui->autoCloseConsoleCheck->setChecked(s->get("AutoCloseConsole").toBool());
	ui->showConsoleErrorCheck->setChecked(s->get("ShowConsoleOnError").toBool());
	QString fontFamily = MMC->settings()->get("ConsoleFont").toString();
	QFont consoleFont(fontFamily);
	ui->consoleFont->setCurrentFont(consoleFont);

	bool conversionOk = true;
	int fontSize = MMC->settings()->get("ConsoleFontSize").toInt(&conversionOk);
	if(!conversionOk)
	{
		fontSize = 11;
	}
	ui->fontSizeBox->setValue(fontSize);
	refreshFontPreview();
	ui->lineLimitSpinBox->setValue(s->get("ConsoleMaxLines").toInt());
	ui->checkStopLogging->setChecked(s->get("ConsoleOverflowStop").toBool());

	// Folders
	ui->instDirTextBox->setText(s->get("InstanceDir").toString());
	ui->modsDirTextBox->setText(s->get("CentralModsDir").toString());
	ui->iconsDirTextBox->setText(s->get("IconsDir").toString());

	QString sortMode = s->get("InstSortMode").toString();

	if (sortMode == "LastLaunch")
	{
		ui->sortLastLaunchedBtn->setChecked(true);
	}
	else
	{
		ui->sortByNameBtn->setChecked(true);
	}

	// Analytics
	if(!BuildConfig.ANALYTICS_ID.isEmpty())
	{
		ui->analyticsCheck->setChecked(s->get("Analytics").toBool());
	}
}

void MultiMCPage::refreshFontPreview()
{
	int fontSize = ui->fontSizeBox->value();
	QString fontFamily = ui->consoleFont->currentFont().family();
	ui->fontPreview->clear();
	defaultFormat->setFont(QFont(fontFamily, fontSize));
	{
		QTextCharFormat format(*defaultFormat);
		format.setForeground(m_colors->getFront(MessageLevel::Error));
		// append a paragraph/line
		auto workCursor = ui->fontPreview->textCursor();
		workCursor.movePosition(QTextCursor::End);
		workCursor.insertText(tr("[Something/ERROR] A spooky error!"), format);
		workCursor.insertBlock();
	}
	{
		QTextCharFormat format(*defaultFormat);
		format.setForeground(m_colors->getFront(MessageLevel::Message));
		// append a paragraph/line
		auto workCursor = ui->fontPreview->textCursor();
		workCursor.movePosition(QTextCursor::End);
		workCursor.insertText(tr("[Test/INFO] A harmless message..."), format);
		workCursor.insertBlock();
	}
	{
		QTextCharFormat format(*defaultFormat);
		format.setForeground(m_colors->getFront(MessageLevel::Warning));
		// append a paragraph/line
		auto workCursor = ui->fontPreview->textCursor();
		workCursor.movePosition(QTextCursor::End);
		workCursor.insertText(tr("[Something/WARN] A not so spooky warning."), format);
		workCursor.insertBlock();
	}
}