/*
  Copyright (C) 2017 Grégory Soutadé
  
  This file is part of Hex offsets.
  
  Hex offsets is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  Hex offsets is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with Hex offsets.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "mainwindow.hpp"
#include "ui_mainwindow.h"
#include "uientry.hpp"

#include <QClipboard>

MainWindow::MainWindow(QWidget *parent, int entriesNumber) :
    QMainWindow(parent),
    ui(new Ui::MainWindow),
    editConversion(false),
    entriesNumber(entriesNumber)
{
    int i;
    UIEntry* entry;

    errorFont.setBold(true);
    redPalette.setColor(QPalette::Text, Qt::red);

    ui->setupUi(this);

    QWidget* curWidget = this->ui->lineBase;
    for(i=0; i<UIEntry::MIN_ENTRIES_NUMBER; i++)
    {
        entry = new UIEntry(0, this);
        ui->verticalLayout->insertWidget(1+i, entry);
        setTabOrder(curWidget, entry->getLine());
        entries.push_back(entry);
        curWidget = entry->getLine();
    }

    this->ui->spinUIEntries->setValue(entriesNumber);
}

class InvalidNumberException
{
};

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

void MainWindow::addValue(QLineEdit* line, UIEntry* entry, long* result, int base)
{
    long temp;
    bool ok;

    if (line->text().length() == 0) return;

    temp = line->text().toLong(&ok, base);
    if (!ok)
    {
        line->setPalette(redPalette);
        line->setFont(errorFont);
        throw(InvalidNumberException());
    }
    else
    {
        line->setPalette(blackPalette);
        line->setFont(normalFont);

        if (entry && !entry->enabled())
            return;

        if (!entry || entry->getOperation() == UIEntry::OPERATION_PLUS)
            *result += temp;
        else
            *result -= temp;
    }
}

void MainWindow::setTextValue(QLineEdit* line, long value, int base)
{
    QString qres;

    if (base == 10 || value >= 0)
        qres.setNum(value, base);
    else
    {
        qres = "-" + qres.setNum(-value, 16);
    }
    line->setText(qres);

}

void MainWindow::computeResult(void)
{
    long result = 0;
    QString qres;

    try
    {
        this->addValue(this->ui->lineBase, 0, &result);
        for (auto entry : entries)
        {
            addValue(entry->getLine(), entry, &result);
        }

        setTextValue(ui->lineResult, result);
    }
    catch(InvalidNumberException e)
    {
        this->ui->lineResult->setText(QString("NaN"));
    }
}

void MainWindow::on_lineBase_textChanged(const QString &arg1)
{
    (void) arg1;
    computeResult();
}

void MainWindow::on_buttonCopyClipboard_clicked()
{
    QApplication::clipboard()->setText(this->ui->lineResult->text());
}

void MainWindow::on_lineDec_textChanged(const QString &arg1)
{
    long result = 0;
    (void) arg1;

    if (editConversion) return;

    editConversion = true;
    try
    {
        addValue(ui->lineDec, 0, &result, 10);
        setTextValue(ui->lineHex, result);
    }
    catch (InvalidNumberException e)
    {
    }

    editConversion = false;
}

void MainWindow::on_lineHex_textChanged(const QString &arg1)
{
    long result = 0;

    (void) arg1;

    if (editConversion) return;

    editConversion = true;
    try
    {
        addValue(ui->lineHex, 0, &result);
        setTextValue(ui->lineDec, result, 10);
    }
    catch (InvalidNumberException e)
    {
    }

    editConversion = false;
}

void MainWindow::on_buttonClearBase_clicked()
{
    this->ui->lineBase->clear();
}

void MainWindow::on_buttonClearAll_clicked()
{
    this->ui->lineBase->clear();
    for (auto entry : entries)
    {
        entry->clear();
    }
}

void MainWindow::on_spinUIEntries_valueChanged(int newValue)
{
    int i, start;
    UIEntry* entry = entries[entries.size()-1];
    QWidget* curWidget = entry->getLine();

    start = entries.size();
    if (newValue == start)
        return;
    else if (newValue > start)
    {
        for(i=start; i<newValue; i++)
        {
            entry = new UIEntry((QWidget*)ui->verticalLayout, this);
            ui->verticalLayout->insertWidget(1+i, entry);
            entries.push_back(entry);
            setTabOrder(curWidget, entry->getLine());
            curWidget = entry->getLine();
        }
    }
    else
    {
        while (start-- > newValue)
        {
            entry = entries.back();
            ui->verticalLayout->removeWidget(entry);

            delete entry;
            entries.pop_back();
        }
    }

    resize(width(), minimumHeight());
    computeResult();
}