#include "exportdialog.h"
#include "ui_exportdialog.h"

// Qt includes
#include <QFileDialog>
#include <QFile>
#include <QMessageBox>

// dbcorelib includes
#include "utils/timeutils.h"

// zeiterfassungcorelib includes
#include "utils/timeutils.h"

// zeiterfassungguilib includes
#include "mainwindow.h"

// zeiterfassungnetworklib includes
#include "zeiterfassungapi.h"
#include "replies/getbookingsreply.h"

ExportDialog::ExportDialog(MainWindow &mainWindow, QWidget *parent) :
    ZeiterfassungDialog(parent),
    ui(new Ui::ExportDialog),
    m_mainWindow(mainWindow)
{
    ui->setupUi(this);

    connect(ui->dateEditFrom, &QDateEdit::dateChanged, ui->dateEditTo, &QDateEdit::setMinimumDate);
    connect(ui->pushButton, &QAbstractButton::pressed, this, &ExportDialog::start);

    ui->dateEditFrom->setDate(beginOfMonth(QDate::currentDate().addMonths(-1)));
    ui->dateEditTo->setDate(endOfMonth(QDate::currentDate().addMonths(-1)));
}

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

void ExportDialog::start()
{
    if(ui->dateEditFrom->date() > ui->dateEditTo->date())
    {
        QMessageBox::warning(this, tr("Invalid date selection!"), tr("Invalid date selection!\n\n%0").arg(tr("From date cannot be after to date!")));
        return;
    }

    const auto filename = QFileDialog::getSaveFileName(this, tr("Save Export as"), QString(), QString("%0 (*.csv)").arg(tr("CSV-File")));

    auto file = std::make_unique<QFile>(filename);
    if(!file->open(QIODevice::WriteOnly | QIODevice::Truncate | QIODevice::Text))
    {
        QMessageBox::warning(this, tr("Could not open export file!"), tr("Could not open export file!\n\n%0").arg(file->errorString()));
        return;
    }

    m_file = std::move(file);

    m_textStream.setDevice(m_file.get());

    m_date = ui->dateEditFrom->date();
    m_toDate = ui->dateEditTo->date();

    ui->pushButton->setEnabled(false);

    ui->progressBar->setMaximum(m_date.daysTo(m_toDate) + 1);
    ui->progressBar->setValue(0);
    ui->progressBar->setEnabled(true);

    ui->plainTextEdit->clear();

    nextDate();
}

void ExportDialog::requestFinished()
{
    ui->progressBar->setValue(ui->progressBar->maximum() - m_date.daysTo(m_toDate));

    const auto date = QLocale().toString(m_date, QLocale::ShortFormat);

    // writes a log line with date prefixed
    const auto log = [plainTextEdit=ui->plainTextEdit, &date](const QString &msg){
        plainTextEdit->appendHtml(QStringLiteral("<b>%0</b> %1<br/>").arg(date, msg));
    };

    if(m_reply->success())
    {
        const auto logBooking = [log](const GetBookingsReply::Booking &booking){
            log(QString("booking %0 %1").arg(QLocale().toString(booking.time), booking.type));
        };

        int totalSeconds = 0;

        auto iter = m_reply->bookings().constBegin();
        while(true)
        {
            if(iter == m_reply->bookings().constEnd())
                break;

            const auto &startBooking = *(iter++);
            logBooking(startBooking);

            if(startBooking.type != "K")
            {
                log("<span style=\"color: red;\">unexpected booking type!</span>");
                break;
            }

            if(iter == m_reply->bookings().constEnd())
            {
                log("<span style=\"color: red;\">missing end booking!</span>");
                break;
            }

            const auto &endBooking = *(iter++);
            logBooking(endBooking);

            if(endBooking.type != "G")
            {
                log("<span style=\"color: red;\">unexpected booking type!</span>");
                break;
            }

            totalSeconds += startBooking.time.secsTo(endBooking.time);
        }

        const auto totalTime = QTime(0, 0).addSecs(totalSeconds).toString(QStringLiteral("HH:mm:ss"));

        m_textStream << date << ';' << totalTime << endl;

        log(QString("<span style=\"color: darkgreen;\">succeeded (%0)</span>!").arg(totalTime));
    }
    else
    {
        log(QString("<span style=\"color: red;\">failed to load</span>: %1").arg(m_reply->message()));
    }

    if(m_date < m_toDate)
    {
        m_date = m_date.addDays(1);
        nextDate();
    }
    else
    {
        m_file = nullptr;
        m_textStream.setDevice(nullptr);
        m_reply = nullptr;
        QMessageBox::information(this, tr("Export finished!"), tr("Export finished!"));
        ui->pushButton->setEnabled(true);
    }
}

void ExportDialog::nextDate()
{
    m_reply = m_mainWindow.erfassung().doGetBookings(m_mainWindow.userInfo().userId, m_date, m_date);
    connect(m_reply.get(), &ZeiterfassungReply::finished, this, &ExportDialog::requestFinished);
}