#include <poppler-qt5.h>
#include <QLabel>
#include <QtDebug>
#include <QFileInfo>
#include <QDesktopServices>
#include <QUrl>
#include <QClipboard>
#include <QtGlobal>
#include <QSettings>
#include <QDateTime>
#include <QProcess>
#include <QComboBox>
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "clicklabel.h"
MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow)
{
	ui->setupUi(this);

	searchWorker = new SearchWorker(QSettings().value("dbpath").toString());
	pdfWorker = new PdfWorker();
	searchWorker->moveToThread(&searchThread);
	pdfWorker->moveToThread(&pdfWorkerThread);
	connectSignals();
	searchThread.start();
	ui->treeResultsList->setContextMenuPolicy(Qt::ContextMenuPolicy::CustomContextMenu);

	ui->tabWidget->setCurrentIndex(0);
	ui->statusBar->addWidget(ui->lblSearchResults);
	ui->statusBar->addWidget(ui->pdfProcessBar);
	ui->pdfProcessBar->hide();
}

void MainWindow::connectSignals()
{
	connect(ui->txtSearch, &QLineEdit::returnPressed, this, &MainWindow::lineEditReturnPressed);
	connect(this, &MainWindow::beginSearch, searchWorker, &SearchWorker::search);
	connect(searchWorker, &SearchWorker::searchResultsReady, this, &MainWindow::handleSearchResults);
	connect(searchWorker, &SearchWorker::searchCancelled, this, &MainWindow::handleCancelledSearch);
	connect(searchWorker, &SearchWorker::searchError, this, &MainWindow::handleSearchError);
	connect(ui->treeResultsList, &QTreeWidget::itemActivated, this, &MainWindow::treeSearchItemActivated);
	connect(ui->treeResultsList, &QTreeWidget::customContextMenuRequested, this,
			&MainWindow::showSearchResultsContextMenu);
	connect(ui->tabWidget, &QTabWidget::currentChanged, this, &MainWindow::tabChanged);
	connect(this, &MainWindow::startPdfPreviewGeneration, pdfWorker, &PdfWorker::generatePreviews);
	connect(pdfWorker, &PdfWorker::previewReady, this, &MainWindow::pdfPreviewReceived);
	connect(pdfWorker, &PdfWorker::previewsFinished, [&] { this->pdfDirty = false; });
	connect(ui->comboScale, qOverload<const QString &>(&QComboBox::currentIndexChanged), this,
			&MainWindow::comboScaleChanged);
}

void MainWindow::comboScaleChanged(QString text)
{
	makePdfPreview();
}
bool MainWindow::pdfTabActive()
{
	return ui->tabWidget->currentIndex() == 1;
}

void MainWindow::keyPressEvent(QKeyEvent *event)
{
	bool quit =
		((event->modifiers() & Qt::ControlModifier && event->key() == Qt::Key_Q) || event->key() == Qt::Key_Escape);
	if(quit)
	{
		qApp->quit();
	}

	if(event->modifiers() & Qt::ControlModifier)
	{

		if(event->key() == Qt::Key_L)
		{
			ui->txtSearch->setFocus();
			ui->txtSearch->selectAll();
		}
	}
	QWidget::keyPressEvent(event);
}

void MainWindow::tabChanged()
{
	if(pdfTabActive())
	{
		if(pdfDirty)
		{
			makePdfPreview();
		}
		ui->pdfProcessBar->show();
	}
	else
	{
		ui->pdfProcessBar->hide();
	}
}

void MainWindow::pdfPreviewReceived(PdfPreview preview)
{
	ClickLabel *label = new ClickLabel();
	label->setPixmap(QPixmap::fromImage(preview.previewImage));
	ui->scrollAreaWidgetContents->layout()->addWidget(label);
	ui->pdfProcessBar->setValue(++processedPdfPreviews);
	connect(label, &ClickLabel::clicked,
			[=]()
			{
				QSettings settings;
				QString command = settings.value("pdfviewer").toString();
				qDebug() << command;
				if(command != "" && command.contains("%p") && command.contains("%f"))
				{
					command = command.replace("%f", preview.documentPath);
					command = command.replace("%p", QString::number(preview.page));
					QStringList splitted = command.split(" ");
					if(splitted.size() > 1)
					{
						QString cmd = splitted[0];
						QStringList args = splitted.mid(1);
						QProcess::startDetached(cmd, args);
					}
				}
				else
				{
					QDesktopServices::openUrl(QUrl::fromLocalFile(preview.documentPath));
				}
			});
}

void MainWindow::lineEditReturnPressed()
{
	QString q = ui->txtSearch->text();
	if(!searchWorker->checkParanthesis(q))
	{
		ui->lblSearchResults->setText("Invalid paranthesis");
		return;
	}
	// TODO: validate q;
	ui->lblSearchResults->setText("Searching...");
	emit beginSearch(q);
}

void MainWindow::handleSearchResults(const QVector<SearchResult> &results)
{
	this->pdfSearchResults.clear();
	ui->treeResultsList->clear();
	ui->lblSearchResults->setText("Results: " + QString::number(results.size()));
	QString lastpath = "";
	for(const SearchResult &result : results)
	{
		if(lastpath != result.fileData.absPath)
		{
			QFileInfo pathInfo(result.fileData.absPath);
			QString fileName = pathInfo.fileName();
			QTreeWidgetItem *item = new QTreeWidgetItem(ui->treeResultsList);

			QDateTime dt = QDateTime::fromSecsSinceEpoch(result.fileData.mtime);
			item->setIcon(0, iconProvider.icon(pathInfo));
			item->setText(0, fileName);
			item->setText(1, result.fileData.absPath);
			item->setText(2, dt.toString(Qt::ISODate));
		}

		// TODO: this must be user defined or done more intelligently
		if(this->pdfSearchResults.size() < 300)
		{
			if(result.fileData.absPath.endsWith(".pdf"))
			{
				this->pdfSearchResults.append(result);
			}
		}
		lastpath = result.fileData.absPath;
	}
	ui->treeResultsList->resizeColumnToContents(0);
	ui->treeResultsList->resizeColumnToContents(1);
	pdfDirty = !this->pdfSearchResults.empty();
	if(pdfTabActive() && pdfDirty)
	{
		makePdfPreview();
	}
}

void MainWindow::makePdfPreview()
{
	if(!pdfWorkerThread.isRunning())
		pdfWorkerThread.start();

	pdfWorker->cancelAndWait();
	QCoreApplication::processEvents(); // Process not processed images
	qDeleteAll(ui->scrollAreaWidgetContents->children());

	ui->scrollAreaWidgetContents->setLayout(new QHBoxLayout());
	ui->pdfProcessBar->setMaximum(this->pdfSearchResults.size());
	processedPdfPreviews = 0;
	QString scaleText = ui->comboScale->currentText();
	scaleText.chop(1);

	emit startPdfPreviewGeneration(this->pdfSearchResults, scaleText.toInt() / 100.);
}

void MainWindow::handleCancelledSearch()
{
}

void MainWindow::handleSearchError(QString error)
{
	ui->lblSearchResults->setText("Error:" + error);
}

void MainWindow::treeSearchItemActivated(QTreeWidgetItem *item, int i)
{
	QDesktopServices::openUrl(QUrl::fromLocalFile(item->text(1)));
}

void MainWindow::showSearchResultsContextMenu(const QPoint &point)
{
	QTreeWidgetItem *item = ui->treeResultsList->itemAt(point);
	if(item == nullptr)
	{
		return;
	}
	QMenu menu("SearchResult", this);
	menu.addAction("Copy filename to clipboard", [&] { QGuiApplication::clipboard()->setText(item->text(0)); });
	menu.addAction("Copy full path to clipboard", [&] { QGuiApplication::clipboard()->setText(item->text(1)); });
	menu.addAction("Open containing folder",
				   [&]
				   {
					   QFileInfo pathinfo(item->text(1));
					   QString dir = pathinfo.absolutePath();
					   QDesktopServices::openUrl(QUrl::fromLocalFile(dir));
				   });
	menu.exec(QCursor::pos());
}

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