#include "keygendialog.h"
#include "configdialog.h"
#include "qprogressindicator.h"
#include "ui_keygendialog.h"
#include <QMessageBox>
#include <QRegularExpression>

#ifdef QT_DEBUG
#include "debughelper.h"
#endif

/**
 * @brief KeygenDialog::KeygenDialog basic constructor.
 * @param parent
 */
KeygenDialog::KeygenDialog(ConfigDialog *parent)
    : QDialog(parent), ui(new Ui::KeygenDialog) {
  ui->setupUi(this);
  dialog = parent;
}

/**
 * @brief KeygenDialog::~KeygenDialog even more basic destructor.
 */
KeygenDialog::~KeygenDialog() { delete ui; }

/**
 * @brief KeygenDialog::on_passphrase1_textChanged see if we want to have
 * protection.
 * @param arg1
 */
void KeygenDialog::on_passphrase1_textChanged(const QString &arg1) {
  bool state = ui->passphrase1->text() == ui->passphrase2->text();
  if (state) {
    replace("Passphrase", arg1);
    no_protection(arg1.isEmpty());
  }

  ui->buttonBox->setEnabled(state);
}

/**
 * @brief KeygenDialog::on_passphrase2_textChanged wrapper for
 * KeygenDialog::on_passphrase1_textChanged
 * @param arg1
 */
void KeygenDialog::on_passphrase2_textChanged(const QString &arg1) {
  on_passphrase1_textChanged(arg1);
}

/**
 * @brief KeygenDialog::on_checkBox_stateChanged expert mode enabled / disabled.
 * @param arg1
 */
void KeygenDialog::on_checkBox_stateChanged(int arg1) {
  ui->plainTextEdit->setReadOnly(!arg1);
  ui->plainTextEdit->setEnabled(arg1);
}

/**
 * @brief KeygenDialog::on_email_textChanged update the email in keypair
 * generation template.
 * @param arg1
 */
void KeygenDialog::on_email_textChanged(const QString &arg1) {
  replace("Name-Email", arg1);
}

/**
 * @brief KeygenDialog::on_name_textChanged update the name in keypair
 * generation template.
 * @param arg1
 */
void KeygenDialog::on_name_textChanged(const QString &arg1) {
  replace("Name-Real", arg1);
}

/**
 * @brief KeygenDialog::replace do some regex magic. fore replacing Passphrase
 * and protection in keypair generation template.
 * @param key
 * @param value
 */
void KeygenDialog::replace(const QString &key, const QString &value) {
  QStringList clear;
  QString expert = ui->plainTextEdit->toPlainText();
  static const QRegularExpression newLines{"[\r\n]"};
#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
  const QStringList lines = expert.split(newLines, Qt::SkipEmptyParts);
#else
  const QStringList lines = expert.split(newLines, QString::SkipEmptyParts);
#endif
  for (QString line : lines) {
    line.replace(QRegularExpression(key + ":.*"), key + ": " + value);
    if (key == "Passphrase")
      line.replace("%no-protection", "Passphrase: " + value);
    clear.append(line);
  }
  ui->plainTextEdit->setPlainText(clear.join("\n"));
}

/**
 * @brief KeygenDialog::no_protection remove protection in keypair generation
 * template.
 * @param enable
 */
void KeygenDialog::no_protection(bool enable) {
  QStringList clear;
  QString expert = ui->plainTextEdit->toPlainText();
  static const QRegularExpression newLines{"[\r\n]"};
#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
  const QStringList lines = expert.split(newLines, Qt::SkipEmptyParts);
#else
  const QStringList lines = expert.split(newLines, QString::SkipEmptyParts);
#endif
  for (QString line : lines) {
    bool remove = false;
    if (!enable) {
      if (line.indexOf("%no-protection") == 0)
        remove = true;
    } else {
      if (line.indexOf("Passphrase") == 0)
        line = "%no-protection";
    }
    if (!remove)
      clear.append(line);
  }
  ui->plainTextEdit->setPlainText(clear.join("\n"));
}

/**
 * @brief KeygenDialog::done we are going to create a key pair and show the
 * QProgressIndicator and some text since the generation will take some time.
 * @param r
 */
void KeygenDialog::done(int r) {
  if (QDialog::Accepted == r) { // ok was pressed
    // check name
    if (ui->name->text().length() < 5) {
      QMessageBox::critical(this, tr("Invalid name"),
                            tr("Name must be at least 5 characters long."));
      return;
    }

    // check email
    static const QRegularExpression mailre(
        QRegularExpression::anchoredPattern(
            R"(\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b)"),
        QRegularExpression::CaseInsensitiveOption);
    if (!mailre.match(ui->email->text()).hasMatch()) {
      QMessageBox::critical(
          this, tr("Invalid email"),
          tr("The email address you typed is not a valid email address."));
      return;
    }

    ui->widget->setEnabled(false);
    ui->buttonBox->setEnabled(false);
    ui->checkBox->setEnabled(false);
    ui->plainTextEdit->setEnabled(false);

    auto *pi = new QProgressIndicator();
    pi->startAnimation();
    pi->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

    ui->frame->hide();
    ui->label->setText(
        tr("This operation can take some minutes.<br />"
           "We need to generate a lot of random bytes. It is a good idea to "
           "perform some other action (type on the keyboard, move the mouse, "
           "utilize the disks) during the prime generation; this gives the "
           "random number generator a better chance to gain enough entropy."));

    this->layout()->addWidget(pi);

    this->show();
    dialog->genKey(ui->plainTextEdit->toPlainText(), this);
  } else { // cancel, close or exc was pressed
    QDialog::done(r);
    return;
  }
}

/**
 * @brief KeygenDialog::closeEvent we are done here.
 * @param event
 */
void KeygenDialog::closeEvent(QCloseEvent *event) {
  // TODO(annejan) save window size or somethign
  event->accept();
}