mainwindow.cpp

#include "mainwindow.h"
#include <QMessageBox>
#include <QInputDialog>
#include <QCryptographicHash>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    setWindowTitle("Password Manager");
    setFixedSize(800, 600);

    centralWidget = new QWidget(this);
    setCentralWidget(centralWidget);
    
    mainLayout = new QVBoxLayout(centralWidget);
    
    //create table
    tableWidget = new QTableWidget(this);
    tableWidget->setColumnCount(3);
    tableWidget->setHorizontalHeaderLabels({"Website", "Username", "Password"});
    tableWidget->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
    
    // buttons
    QHBoxLayout *buttonLayout = new QHBoxLayout();
    addButton = new QPushButton("Add Entry", this);
    deleteButton = new QPushButton("Delete Entry", this);
    
    buttonLayout->addWidget(addButton);
    buttonLayout->addWidget(deleteButton);
    
    mainLayout->addWidget(tableWidget);
    mainLayout->addLayout(buttonLayout);
    


    connect(addButton, &QPushButton::clicked, this, &MainWindow::onAddEntry);
    connect(deleteButton, &QPushButton::clicked, this, &MainWindow::onDeleteEntry);
    connect(tableWidget, &QTableWidget::cellDoubleClicked, this, &MainWindow::onShowPassword);
    
    updateTable();
}

MainWindow::~MainWindow() {}

void MainWindow::onAddEntry() {
    bool ok;
    QString website = QInputDialog::getText(this, "Add Entry",
                                          "Website:", QLineEdit::Normal, "", &ok);
    if (!ok || website.isEmpty())
        return;
        
    QString username = QInputDialog::getText(this, "Add Entry",
                                           "Username:", QLineEdit::Normal, "", &ok);
    if (!ok)
        return;
        
    QString password = QInputDialog::getText(this, "Add Entry",
                                           "Password:", QLineEdit::Password, "", &ok);
    if (!ok)
        return;
        
    PasswordEntry entry{website, username, encryptString(password)};
    passwords.append(entry);
    updateTable();
}

void MainWindow::onDeleteEntry() {
    int row = tableWidget->currentRow();
    if (row >= 0) {
        passwords.remove(row);
        updateTable();
    }
}

void MainWindow::onShowPassword() {
    int row = tableWidget->currentRow();
    if (row >= 0) {
        QString decryptedPassword = decryptString(passwords[row].password);
        QMessageBox::information(this, "Password",
                               "Password: " + decryptedPassword);
    }
}

// XOR encryption
QString MainWindow::encryptString(const QString &input) {
    // AGAIN, In a real application, use a safer encryption library/method
    QString key = "SECRET_KEY";
    QString result;
    for (int i = 0; i < input.length(); i++) {
        result += QChar(input[i].unicode() ^ key[i % key.length()].unicode());
    }
    return result.toUtf8().toBase64();
}

QString MainWindow::decryptString(const QString &input) {
    QString key = "SECRET_KEY";
    QString decoded = QByteArray::fromBase64(input.toUtf8());
    QString result;
    for (int i = 0; i < decoded.length(); i++) {
        result += QChar(decoded[i].unicode() ^ key[i % key.length()].unicode());
    }
    return result;
}

void MainWindow::updateTable() {
    tableWidget->setRowCount(passwords.size());
    for (int i = 0; i < passwords.size(); i++) {
        tableWidget->setItem(i, 0, new QTableWidgetItem(passwords[i].website));
        tableWidget->setItem(i, 1, new QTableWidgetItem(passwords[i].username));
        tableWidget->setItem(i, 2, new QTableWidgetItem("********"));
    }
}