#include "reportdialog.h"

#include "mainwindow.h"

#include <posprinter.h>

#include <QFileDialog>
#include <QFontDatabase>
#include <QPainter>
#include <QSettings>
#include <QtPrintSupport/QPrintDialog>
#include <QtPrintSupport/QPrinter>

ReportDialog::ReportDialog(QWidget* parent, Qt::WindowFlags f) : QDialog(parent, f)
{
    ui_.setupUi(this);
    market_ = dynamic_cast<MainWindow*>(parent)->getMarketplace();
    model_ = std::make_unique<ReportModel>(market_, ui_.reportView);
    ui_.reportView->setModel(model_.get());
    ui_.reportView->hideColumn(0);

    connect(ui_.exportCsvButton, &QPushButton::clicked, this,
            &ReportDialog::onExportCsvButtonClicked);
    connect(ui_.printReportButton, &QPushButton::clicked, this,
            &ReportDialog::onPrintReportButtonClicked);
    connect(ui_.printSellerReceiptButton, &QPushButton::clicked, this,
            &ReportDialog::onPrintSellerReceiptButtonClicked);
    connect(ui_.reportView->selectionModel(), &QItemSelectionModel::selectionChanged, this,
            &ReportDialog::onReportViewSelectionChanged);
}

void ReportDialog::onExportCsvButtonClicked()
{
    QSettings settings;
    int feeInPercent = settings.value("global/feeInPercent").toInt();
    int maxFeeInEuro = settings.value("global/maxFeeInEuro").toInt();

    QFileDialog fileDialog(this);
    fileDialog.setFileMode(QFileDialog::AnyFile);
    fileDialog.setNameFilter("CSV Files (*.csv)");
    fileDialog.setAcceptMode(QFileDialog::AcceptSave);
    if (fileDialog.exec()) {
        market_->exportReportToCSV(fileDialog.selectedFiles().at(0).toStdString(), feeInPercent,
                                   maxFeeInEuro);
    }
}

void ReportDialog::onPrintReportButtonClicked()
{
    QPrinter printer;

    QPrintDialog dialog(&printer, this);
    dialog.setWindowTitle("Bericht drucken");

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

    QSettings settings;
    int feeInPercent = settings.value("global/feeInPercent").toInt();
    int maxFeeInEuro = settings.value("global/maxFeeInEuro").toInt();

    QPainter painter;
    int height = printer.height();
    int width = printer.width();
    const double ENTRIES_PER_PAGE = 50.0;
    const auto& sellers = market_->getSellers();
    unsigned int numPages = std::ceil(sellers.size() / ENTRIES_PER_PAGE);

    painter.begin(&printer);
    QFont fixedFont = QFontDatabase::systemFont(QFontDatabase::FixedFont);
    fixedFont.setPointSize(12);

    for (unsigned int i = 1; i <= numPages; ++i) {
        if (i > 1)
            printer.newPage();
        painter.setFont(QFont("Arial", 16, QFont::Bold));
        painter.drawText(QRect(0, 0, width, height), Qt::AlignTop | Qt::AlignHCenter,
                         "Auswertung Kindersachenmarkt");
        painter.setFont(fixedFont);
        QString content;
        content += QString("%1 %2 %3 %4 %5 %6 %7")
                       .arg("Nr.", -3)
                       .arg("Nachname", -14)
                       .arg("Vorname", -14)
                       .arg("geliefert", -9)
                       .arg("verkauft", -8)
                       .arg("Umsatz", -10)
                       .arg("Auszahlung\n", -11);
        content.append(
            "---------------------------------------------------------------------------\n");
        for (unsigned int j = 0; j < ENTRIES_PER_PAGE && (i * j) < sellers.size(); ++j) {
            content += QString("%1 %2 %3 %4 %5 %6 %7\n")
                           .arg(sellers.at(i * j)->getSellerNo(), 3)
                           .arg(sellers.at(i * j)->getLastName().substr(0, 14).c_str(), -14)
                           .arg(sellers.at(i * j)->getFirstName().substr(0, 14).c_str(), -14)
                           .arg(sellers.at(i * j)->numArticlesOffered(), 9)
                           .arg(sellers.at(i * j)->numArticlesSold(), 8)
                           .arg(sellers.at(i * j)->sumAsString().c_str(), 10)
                           .arg(paymentAsString(sellers.at(i * j)->sumInCents(), feeInPercent,
                                                maxFeeInEuro * 100)
                                    .c_str(),
                                11);
        }
        painter.drawText(QRect(0, 50, width, height), Qt::AlignLeft, content);
    }

    // pieces booked on the special account "Sonderkonto"
    const auto specialSeller = market_->findSellerWithUuid("11111111-1111-1111-1111-111111111111");
    if (specialSeller && specialSeller->numArticlesSold() > 0) {
        printer.newPage();
        painter.setFont(QFont("Arial", 16, QFont::Bold));
        painter.drawText(QRect(0, 0, width, height), Qt::AlignTop | Qt::AlignHCenter,
                         "Auswertung Kindersachenmarkt");
        painter.setFont(fixedFont);
        QString content("Einzelteile ohne Nummer\n=======================\n\n");
        unsigned int lines{0};
        unsigned int pages{1};
        for (const auto& article : specialSeller->getArticles(true)) {
            content += QString("- %1:").arg(article->getDescription().substr(0, 45).c_str(), -45);
            content += QString("%1\n").arg(article->getPriceAsString().c_str(), 11);
            ++lines;
            if (lines % static_cast<int>(ENTRIES_PER_PAGE) == 0 &&
                (pages * lines) < specialSeller->getArticles(true).size()) {
                painter.drawText(QRect(0, 50, width, height), Qt::AlignLeft, content);
                lines = 0;
                ++pages;
                printer.newPage();
                painter.setFont(QFont("Arial", 16, QFont::Bold));
                painter.drawText(QRect(0, 0, width, height), Qt::AlignTop | Qt::AlignHCenter,
                                 "Auswertung Kindersachenmarkt");
                painter.setFont(QFont("monospace", 12));
                content = "Einzelteile ohne Nummer\n=======================\n\n";
            }
        }
        painter.drawText(QRect(0, 50, width, height), Qt::AlignLeft, content);
    }

    // overall statistics
    printer.newPage();
    painter.setFont(QFont("Arial", 16, QFont::Bold));
    painter.drawText(QRect(0, 0, width, height), Qt::AlignTop | Qt::AlignHCenter,
                     "Auswertung Kindersachenmarkt");
    painter.setFont(fixedFont);
    QString content("Gesamtstatistik\n===============\n\n");
    content += QString("Registrierte Verkäufer: %1\n").arg(sellers.size(), 6);
    content += QString("Verkaufte Artikel:      %1\n\n").arg(market_->getNumArticlesSold(), 6);
    content += QString("  Gesamtumsatz:     %1\n").arg(market_->getOverallSumAsString().c_str(), 10);
    content +=
        QString("  Ausgezahlt:       %1\n")
            .arg(market_->getOverallPaymentAsString(feeInPercent, maxFeeInEuro * 100).c_str(), 10);
    content +=
        QString("  Verbleibend:      %1\n")
            .arg(market_->getOverallRevenueAsString(feeInPercent, maxFeeInEuro * 100).c_str(), 10);
    painter.drawText(QRect(0, 50, width, height), Qt::AlignLeft, content);

    painter.end();
}

void ReportDialog::onPrintSellerReceiptButtonClicked()
{
    QSettings settings;
    int feeInPercent = settings.value("global/feeInPercent").toInt();
    int maxFeeInEuro = settings.value("global/maxFeeInEuro").toInt();

    auto selModel = ui_.reportView->selectionModel();
    if (selModel->hasSelection() == false)
        return;

    auto indexes = selModel->selectedRows();
    auto& seller = market_->getSellers().at(indexes[0].row());
    PosPrinter printer;
    if (printer.isValid())
        printer.printSellerReceipt(seller.get(), feeInPercent, maxFeeInEuro * 100);
}

void ReportDialog::onReportViewSelectionChanged(const QItemSelection& selected,
                                                [[maybe_unused]] const QItemSelection& deselected)
{
    if (selected.size() > 0) {
        ui_.printSellerReceiptButton->setEnabled(true);
    } else {
        ui_.printSellerReceiptButton->setEnabled(false);
    }
}