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

#include "version.h"

#include <QJsonObject>
#include <QJsonDocument>
#include <QFile>
#include <QFileDialog>
#include <QDataWidgetMapper>
#include <QCloseEvent>
#include <QMessageBox>
#include <QtPrintSupport/QPrinter>
#include <QtPrintSupport/QPrintDialog>
#include <QTextDocument>
#include <QPainter>

#include <QDebug>

#include <fstream>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
    , m_dataModel(this)
{
	ui->setupUi(this);
	setupUi();

	newFile();
}

MainWindow::MainWindow(QWidget *parent, const QString &filename)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
    , m_dataModel(this)
{
	ui->setupUi(this);
	setupUi();

	openFile(filename);
}

void MainWindow::setupUi()
{
	ui->metaDataWidget->setModel(&m_dataModel.m_metaData);
	ui->verbEndWidget->setModel(&m_dataModel.m_verbEnd);
	ui->genusWidget->setModel(&m_dataModel.m_genus);
	ui->pluralWidget->setModel(&m_dataModel.m_plural);
	ui->akkusativDativWidget->setAkkusativModel(&m_dataModel.m_akkusativ);
	ui->akkusativDativWidget->setDativModel(&m_dataModel.m_dativ);

	ui->v2SvkWidget->setWFModel(&m_dataModel.m_wfModel);
	ui->v2SvkWidget->setOTModel(&m_dataModel.m_otModel);
	ui->v2SvkWidget->setTPrModel(&m_dataModel.m_tPrModel);
	ui->v2SvkWidget->setTPeModel(&m_dataModel.m_tPeModel);

	ui->lateSkillsWidget->setPassivModel(&m_dataModel.m_passiv);
	ui->lateSkillsWidget->setGenitivModel(&m_dataModel.m_genitiv);
	ui->resultWidget->setModel(&m_dataModel.m_results);

	connect(ui->actionNew, &QAction::triggered, this, &MainWindow::newFile);
	connect(ui->actionOpen, &QAction::triggered, this, qOverload<>(&MainWindow::openFile));
	connect(ui->actionSave, &QAction::triggered, this, qOverload<>(&MainWindow::saveFile));
	connect(ui->actionSave_as, &QAction::triggered, this, &MainWindow::saveFileAs);
	connect(ui->actionPrint, &QAction::triggered, this, &MainWindow::print);
	connect(ui->actionExport_PDF, &QAction::triggered, this, qOverload<>(&MainWindow::savePdf));

	connect(ui->actionAbout, &QAction::triggered, this, &MainWindow::aboutDialog);

	connect(&m_dataModel, &DataModel::modelChanged, this, &MainWindow::dataModelChanged);
}

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

void MainWindow::newFile()
{
	closeFile();

	setWindowModified(false);
	setWindowTitle("untitled[*]");
	m_filename = "";
	m_saveOnClose = false;
}

void MainWindow::openFile()
{
	QString filename =
	    QFileDialog::getOpenFileName(this, "Open file", "", "ESGRAF 4-8 (*.esgraf48)");
	if (filename.isEmpty())
	{
		return;
	}

	try
	{
		openFile(filename);
	}
	catch (std::exception &e)
	{
		QString errorMessage = QString("Error loading \"") + filename + "\": " + e.what();
		QMessageBox::critical(this, "Error", errorMessage);
	}
}

void MainWindow::openFile(const QString &filename)
{
	closeFile();

	m_dataModel.read(filename);

	setWindowModified(false);
	setWindowTitle(filename + "[*]");
	m_saveOnClose = false;
	m_filename = filename;

	ui->metaDataWidget->toFirst();
}

void MainWindow::saveFile()
{
	if (m_filename.isEmpty())
	{
		saveFileAs();
	}
	else
	{
		saveFile(m_filename);
	}
}

void MainWindow::saveFileAs()
{
	QFileDialog saveFilenameDialog(this);
	saveFilenameDialog.setAcceptMode(QFileDialog::AcceptSave);
	saveFilenameDialog.setDefaultSuffix("esgraf48");
	saveFilenameDialog.setFileMode(QFileDialog::AnyFile);
	saveFilenameDialog.setNameFilter("ESGRAF 4-8 (*.esgraf48)");
	saveFilenameDialog.setWindowTitle("Save file");

	if (!saveFilenameDialog.exec())
	{
		return;
	}

	saveFile(saveFilenameDialog.selectedFiles().first());
}

void MainWindow::closeFile()
{
	if (m_saveOnClose == true)
	{
		QMessageBox msgBox;
		msgBox.setText("The document has been modified.");
		msgBox.setInformativeText("Do you want to save your changes?");
		msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard);
		msgBox.setDefaultButton(QMessageBox::Save);

		if (msgBox.exec() == QMessageBox::Save)
		{
			saveFile();
		}
	}
}

void MainWindow::print() const
{
	QPrinter printer;
	printer.setPaperSize(QPrinter::A4);
	printer.setPageMargins(20, 20, 20, 20, QPrinter::Millimeter);

	QPrintDialog dialog(&printer);
	if (dialog.exec() != QDialog::Accepted)
	{
		return;
	}

	m_dataModel.printTo(printer);
}

void MainWindow::dataModelChanged()
{
	m_saveOnClose = true;
	setWindowModified(true);
}

void MainWindow::savePdf()
{
	QFileDialog saveFilenameDialog(this);
	saveFilenameDialog.setDefaultSuffix("pdf");
	saveFilenameDialog.setFileMode(QFileDialog::AnyFile);
	saveFilenameDialog.setNameFilter("PDF File (*.pdf)");
	saveFilenameDialog.setWindowTitle("Save file");

	if (!saveFilenameDialog.exec())
	{
		return;
	}

	savePdf(saveFilenameDialog.selectedFiles().first());
}

void MainWindow::closeEvent(QCloseEvent *event)
{
	closeFile();
}

void MainWindow::saveFile(const QString &filename)
{
	try
	{
		m_dataModel.write(filename);
	}
	catch (std::exception &e)
	{
		QString errorMessage = QString("Error saving \"") + filename + "\": " + e.what();
		QMessageBox::critical(this, "Error", errorMessage);
		return;
	}

	qDebug() << "Wrote" << filename;

	setWindowTitle(filename + "[*]");
	setWindowModified(false);
	m_filename = filename;
	m_saveOnClose = false;
}

void MainWindow::savePdf(const QString &filename)
{
	QPrinter printer;
	printer.setOutputFormat(QPrinter::PdfFormat);
	printer.setPaperSize(QPrinter::A4);
	printer.setPageMargins(20, 20, 20, 20, QPrinter::Millimeter);
	printer.setOutputFileName(filename);

	m_dataModel.printTo(printer);
}

void MainWindow::aboutDialog()
{
	QString infoString =
	    QString::fromUtf8(ESGRAF48_DESCRIPTION) + " Version " + QString::fromUtf8(ESGRAF48_VERSION);
	QMessageBox::information(this, ESGRAF48_DESCRIPTION, infoString);
}