#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QFileDialog>
#include <QDockWidget>
#include <QLabel>
#include <poppler-qt5.h>
#include "infowidget/infowidget.h"
#include "contentswidget/contentswidget.h"

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

    auto *infoDock = new QDockWidget(tr("Info"), this);
    info = new InfoForm(infoDock);
    infoDock->setWidget(info);
    addDockWidget(Qt::LeftDockWidgetArea, infoDock);

    auto *contentsDock = new QDockWidget(tr("Contents"), this);
    contents = new ContentsForm(contentsDock);
    contentsDock->setWidget(contents);
    addDockWidget(Qt::LeftDockWidgetArea, contentsDock);

    connect(ui->actionOpen, &QAction::triggered, this, [this]() {
        const QString userPath = QFileDialog::getOpenFileName(this, tr("Select PDF to open"), QDir::homePath(), tr("PDF Files (*.pdf);;All Files (*)"));
        if(!userPath.isEmpty())
            this->open(userPath);
    });
    connect(ui->actionQuit, &QAction::triggered, qApp, &QApplication::quit);

    // navigation
    connect(ui->previous, &QToolButton::clicked, this, [this]() {
        const int currentPage = ui->pageNumber->text().toInt();
        this->showPage(currentPage - 1);
    });
    connect(ui->next, &QToolButton::clicked, this, [this]() {
        const int currentPage = ui->pageNumber->text().toInt();
        this->showPage(currentPage + 1);
    });
    connect(ui->pageNumber, &QLineEdit::textEdited, this, [this](const QString &text) {
        const int page = text.toInt();
        this->showPage(page);
    });
}

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

void MainWindow::open(const QString &path)
{
    if(path.isEmpty()) {
        return;
    }

    if(!QFile::exists(path)) {
        statusBar()->showMessage(tr("Couldn't open file because it doesn't exist"), 3000);
        return;
    }

    qDebug("open path: %s", qUtf8Printable(path));
    delete document;

    document = Poppler::Document::load(path);
    if(!document || document->isLocked()) {
        statusBar()->showMessage(tr("Couldn't parse file"), 3000);
        return;
    }

    info->setMetadata(InfoForm::Title, document->title());
    info->setMetadata(InfoForm::Subject, document->subject());
    info->setMetadata(InfoForm::Author, document->author());
    info->setMetadata(InfoForm::Creator, document->creator());
    info->setMetadata(InfoForm::CreationDate, document->creationDate().toString(Qt::RFC2822Date));
    info->setMetadata(InfoForm::ModificationDate, document->modificationDate().toString(Qt::RFC2822Date));
    info->setMetadata(InfoForm::Producer, document->producer());

    contents->setContents(document->toc());

    showPage(0);

    statusBar()->showMessage(tr("Opened file %1").arg(path), 3000);
}

void MainWindow::showPage(int pageNumber)
{
    auto *page = document->page(pageNumber);
    if(page == nullptr)
        return;

    ui->pageNumber->setText(QString::number(pageNumber));

    const auto image = page->renderToImage();
    auto *label = new QLabel(this);
    label->setPixmap(QPixmap::fromImage(image));

    ui->scrollArea->setWidget(label);

    delete page;
}