#include "Introduction.h"
#include "CompositionButton.h"
#include <QPushButton>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QGroupBox>
#include <QLineEdit>
#include <QMap>
#include <QDateTime>
#include <QSettings>
#include <QLabel>
#include <QMenuBar>
#include <QPlainTextEdit>
#include <QStyle>
#include <QFile>
#include <QApplication>
#include <QDialogButtonBox>
#include <QScrollArea>
#include <QScrollBar>
#include <QAbstractButton>

Introduction::Introduction(QWidget *parent) :
	QDialog(parent),
	m_title(0),
	m_edit(0),
	m_editApply(0),
	m_existingCompositionBox(0)
{
#ifdef Q_OS_MAC
	QMenuBar *globalMenu = new QMenuBar(this);
	globalMenu->addMenu(QLatin1String("About"))->addAction(QLatin1String("About Author"), this, SLOT(about()));
#endif
	setWindowTitle(tr("Author - Introduction"));
	QHBoxLayout *layout = new QHBoxLayout;

	QGroupBox *newCompositionBox = new QGroupBox(tr("Create a New Composition"));
	QVBoxLayout *newCompositionBoxLayout = new QVBoxLayout;
	QLabel *instructions = new QLabel(tr("<h3>Welcome to <i>Author</i>. To get started with your finely authored composition, please enter a title.</h3>"));
	QFont font;
	font.setFamily("CMU Typewriter Text Variable Width");
	instructions->setFont(font);
	instructions->setWordWrap(true);
	QLabel *image = new QLabel;
	image->setPixmap(QPixmap(QLatin1String(":/journal.png")));
	newCompositionBoxLayout->addWidget(instructions);
	newCompositionBoxLayout->addStretch();
	newCompositionBoxLayout->addWidget(image, 0, Qt::AlignCenter);
	newCompositionBoxLayout->addStretch();
	font.setPointSize(16);
	font.setBold(true);
	m_title = new QLineEdit(defaultName());
	m_title->setFont(font);
	m_title->setAlignment(Qt::AlignCenter);
	newCompositionBoxLayout->addWidget(m_title);
	QPushButton *okay = new QPushButton(tr("Wonderful, let's begin!"));
	font.setPointSize(18);
	okay->setFont(font);
	connect(okay, SIGNAL(clicked()), this, SLOT(accept()));
	newCompositionBoxLayout->addWidget(okay);
	newCompositionBox->setLayout(newCompositionBoxLayout);
	layout->addWidget(newCompositionBox);

	QSettings s;
	bool hasExisting = false;
	foreach (const QString &title, s.childGroups()) {
		const QString key = QString("%1/lastModified").arg(title);
		if (s.contains(key)) {
			hasExisting = true;
			break;
		}
	}
	if (hasExisting) {
		m_existingCompositionBox = new QGroupBox(tr("Resume an Existing Composition"));
		QVBoxLayout *existingCompositionBoxLayout = new QVBoxLayout;
		existingCompositionBoxLayout->setSpacing(0);
		QMap<QDateTime, QString> sorter;
		foreach (const QString &title, s.childGroups()) {
			const QString key = QString("%1/lastModified").arg(title);
			if (s.contains(key))
				sorter.insertMulti(s.value(key).toDateTime(), title);
		}
		QMapIterator<QDateTime, QString> i(sorter);
		while (i.hasNext()) {
			i.next();
			CompositionButton *button = new CompositionButton(i.value(), i.key());
			m_compositionButtons.append(button);
			connect(button, SIGNAL(selected()), this, SLOT(loadExisting()));
			existingCompositionBoxLayout->insertWidget(0, button);
		}
		existingCompositionBoxLayout->addStretch();

		QWidget *container = new QWidget;
		container->setLayout(existingCompositionBoxLayout);
		QScrollArea *scroller = new QScrollArea;
		scroller->setFrameStyle(QFrame::NoFrame);
		scroller->setWidget(container);
		QVBoxLayout *scrollerLayout = new QVBoxLayout;
		scrollerLayout->setContentsMargins(0, 0, 0, 0);
		scrollerLayout->addWidget(scroller);
		container->setAutoFillBackground(false);
		scroller->viewport()->setAutoFillBackground(false);
		scroller->setMinimumWidth(scroller->sizeHint().width() + scroller->verticalScrollBar()->sizeHint().width());

		m_edit = new QPushButton(QIcon(QLatin1String(":/renameremove.png")), tr("Rename or Remove"));
		connect(m_edit, SIGNAL(clicked()), this, SLOT(edit()));
		m_editApply = new QDialogButtonBox(QDialogButtonBox::Apply | QDialogButtonBox::Discard);
		m_editApply->setCenterButtons(true);
		connect(m_editApply, SIGNAL(clicked(QAbstractButton*)), this, SLOT(applyDiscard(QAbstractButton*)));
		scrollerLayout->addWidget(m_edit);

		m_existingCompositionBox->setLayout(scrollerLayout);
		layout->addWidget(m_existingCompositionBox);
	}

	setLayout(layout);
	setMinimumHeight(sizeHint().height());
	setFixedWidth(sizeHint().width());
}
Introduction::~Introduction()
{
	if (m_existingCompositionBox) {
		if (m_edit)
			m_edit->deleteLater();
		if (m_editApply)
			m_editApply->deleteLater();
	}
}
QString Introduction::title() const
{
	if (m_title->text().trimmed().length() == 0)
		return defaultName();
	return m_title->text().trimmed();
}
QString Introduction::defaultName() const
{
	int index = 1;
	QString pattern("A %1%2 Composition");
	QString name;
	QSettings s;
	do {
		QString suffix;
		if (10 < (index % 100) && (index % 100) < 14)
			suffix = tr("th");
		switch (index % 10) {
		case 1:
			suffix = tr("st");
			break;
		case 2:
			suffix = tr("nd");
			break;
		case 3:
			suffix = tr("rd");
			break;
		default:
			suffix = tr("th");
			break;
		}
		name = pattern.arg(QString::number(index), suffix);
		++index;
	} while (s.contains(name + QLatin1String("/state")));
	return name;
}
void Introduction::loadExisting()
{
	CompositionButton *button = qobject_cast<CompositionButton*>(sender());
	if (!button)
		return;
	if (button->editMode())
		button->setDeleted(!button->deleted());
	else {
		m_title->setText(button->title());
		accept();
	}
}
void Introduction::about()
{
	QDialog *about = new QDialog(0, Qt::Popup);
	about->setAttribute(Qt::WA_DeleteOnClose);
	QVBoxLayout *layout = new QVBoxLayout;
	QLabel *mainText = new QLabel(tr("<img src=\":/typewriter.png\" width=\"64\" height=\"64\" align=\"left\"><h4><i>Author</i> for Mac v%1</h4><p align=\"justify\"><i>Author</i> helps you write distraction free as the great writers have for centuries. It was inspired by many long conversations with <a href=\"http://www.signal11.com\">Adam Weiss</a> and was birthed by <a href=\"http://www.jasondonenfeld.com\">Jason Donenfeld</a> and <a href=\"http://www.zx2c4.com\">ZX2C4 Software</a>.</p><p>Visit the <a href=\"http://www.zx2c4.com/projects/author\"><i>Author</i> website</a> for more information. You may address any questions to <a href=\"mailto:AuthorApp@zx2c4.com\">AuthorApp@zx2c4.com</a>.</p><p>(C) Copyright 2011 Jason A. Donenfeld. All Rights Reserved.</p>").arg(QApplication::applicationVersion()));
	mainText->setOpenExternalLinks(true);
	mainText->setTextInteractionFlags(Qt::TextInteractionFlags(style()->styleHint(QStyle::SH_MessageBox_TextInteractionFlags, 0, this)));
	mainText->setWordWrap(true);
	layout->addWidget(mainText);
	QFile licenseText(QLatin1String(":/licenses.txt"));
	licenseText.open(QIODevice::ReadOnly);
	QPlainTextEdit *licenses = new QPlainTextEdit(licenseText.readAll());
	licenseText.close();
	QFont font;
	font.setPointSize(8);
	licenses->setFont(font);
	licenses->setReadOnly(true);
	licenses->setMaximumHeight(100);
	layout->addWidget(licenses);
	QDialogButtonBox *buttons = new QDialogButtonBox(QDialogButtonBox::Ok);
	buttons->setCenterButtons(style()->styleHint(QStyle::SH_MessageBox_CenterButtons, 0, this));
	connect(buttons, SIGNAL(accepted()), about, SLOT(accept()));
	layout->addWidget(buttons);
	about->setLayout(layout);
	about->exec();
}
void Introduction::edit()
{
	foreach (CompositionButton *button, m_compositionButtons)
		button->setEditMode(true);
	QLayout *layout = m_edit->parentWidget()->layout();
	layout->removeWidget(m_edit);
	m_edit->setParent(0);
	layout->addWidget(m_editApply);
}
void Introduction::applyDiscard(QAbstractButton *button)
{
	bool apply = m_editApply->buttonRole(button) == QDialogButtonBox::ApplyRole;
	QSettings s;
	foreach (CompositionButton *compositionButton, m_compositionButtons) {
		if (apply && compositionButton->deleted()) {
			s.remove(compositionButton->title());
			m_compositionButtons.removeOne(compositionButton);
			compositionButton->deleteLater();
		}
		else if (apply && compositionButton->editedTitle().trimmed().length() > 0 && compositionButton->editedTitle().trimmed() != compositionButton->title().trimmed()) {
			if (s.childGroups().contains(compositionButton->editedTitle().trimmed())) {
				compositionButton->setEditMode(false, false);
				continue;
			}
			foreach (const QString &key, s.allKeys()) {
				if (key.startsWith(compositionButton->title() + QLatin1String("/"))) {
					QString newKey = key;
					newKey.replace(compositionButton->title(), compositionButton->editedTitle().trimmed());
					s.setValue(newKey, s.value(key));
				}
			}
			s.remove(compositionButton->title());
			compositionButton->setEditMode(false, true);
		} else
			compositionButton->setEditMode(false, false);
	}
	QLayout *layout = m_editApply->parentWidget()->layout();
	layout->removeWidget(m_editApply);
	m_editApply->setParent(0);
	layout->addWidget(m_edit);
	if (m_compositionButtons.isEmpty()) {
		delete m_existingCompositionBox;
		m_existingCompositionBox = 0;
		setFixedWidth(sizeHint().width());
	}
}