#include "profile_dialog.h"

#include <QComboBox>
#include <QDialogButtonBox>
#include <QFileDialog>
#include <QFormLayout>
#include <QHBoxLayout>
#include <QLabel>
#include <QLineEdit>
#include <QMessageBox>
#include <QPushButton>
#include <QSignalBlocker>
#include <QSpinBox>
#include <QVBoxLayout>

namespace {
int standardPortForProtocol(const QString& protocol)
{
    if (protocol == QStringLiteral("RDP")) {
        return 3389;
    }
    if (protocol == QStringLiteral("VNC")) {
        return 5900;
    }
    return 22; // SSH default
}
}

ProfileDialog::ProfileDialog(QWidget* parent)
    : QDialog(parent),
      m_nameInput(new QLineEdit(this)),
      m_hostInput(new QLineEdit(this)),
      m_portInput(new QSpinBox(this)),
      m_usernameInput(new QLineEdit(this)),
      m_protocolInput(new QComboBox(this)),
      m_authModeInput(new QComboBox(this)),
      m_privateKeyPathInput(new QLineEdit(this)),
      m_browsePrivateKeyButton(new QPushButton(QStringLiteral("Browse"), this)),
      m_knownHostsPolicyInput(new QComboBox(this))
{
    resize(520, 340);

    auto* layout = new QVBoxLayout(this);
    auto* form = new QFormLayout();

    m_nameInput->setPlaceholderText(QStringLiteral("Production Bastion"));
    m_hostInput->setPlaceholderText(QStringLiteral("example.internal"));
    m_portInput->setRange(1, 65535);
    m_portInput->setValue(22);
    m_usernameInput->setPlaceholderText(QStringLiteral("deploy"));

    m_protocolInput->addItems({QStringLiteral("SSH"), QStringLiteral("RDP"), QStringLiteral("VNC")});
    m_authModeInput->addItems({QStringLiteral("Password"), QStringLiteral("Private Key")});
    m_knownHostsPolicyInput->addItems(
        {QStringLiteral("Ask"), QStringLiteral("Strict"), QStringLiteral("Accept New"), QStringLiteral("Ignore")});

    m_privateKeyPathInput->setPlaceholderText(QStringLiteral("/home/user/.ssh/id_ed25519"));

    auto* privateKeyRow = new QWidget(this);
    auto* privateKeyLayout = new QHBoxLayout(privateKeyRow);
    privateKeyLayout->setContentsMargins(0, 0, 0, 0);
    privateKeyLayout->addWidget(m_privateKeyPathInput, 1);
    privateKeyLayout->addWidget(m_browsePrivateKeyButton);

    connect(m_browsePrivateKeyButton,
            &QPushButton::clicked,
            this,
            [this]() {
                const QString selected = QFileDialog::getOpenFileName(this,
                                                                      QStringLiteral("Select Private Key"),
                                                                      QString(),
                                                                      QStringLiteral("All Files (*)"));
                if (!selected.isEmpty()) {
                    m_privateKeyPathInput->setText(selected);
                }
            });

    connect(m_protocolInput,
            &QComboBox::currentTextChanged,
            this,
            [this](const QString& protocol) {
                m_portInput->setValue(standardPortForProtocol(protocol));
                refreshAuthFields();
            });

    connect(m_authModeInput,
            &QComboBox::currentTextChanged,
            this,
            [this](const QString&) { refreshAuthFields(); });

    form->addRow(QStringLiteral("Name"), m_nameInput);
    form->addRow(QStringLiteral("Host"), m_hostInput);
    form->addRow(QStringLiteral("Port"), m_portInput);
    form->addRow(QStringLiteral("Username"), m_usernameInput);
    form->addRow(QStringLiteral("Protocol"), m_protocolInput);
    form->addRow(QStringLiteral("Auth Mode"), m_authModeInput);
    form->addRow(QStringLiteral("Private Key"), privateKeyRow);
    form->addRow(QStringLiteral("Known Hosts"), m_knownHostsPolicyInput);

    auto* note = new QLabel(
        QStringLiteral("Passwords are requested at connect time and are not stored."),
        this);
    note->setWordWrap(true);

    auto* buttons = new QDialogButtonBox(QDialogButtonBox::Ok | QDialogButtonBox::Cancel, this);
    connect(buttons, &QDialogButtonBox::accepted, this, &QDialog::accept);
    connect(buttons, &QDialogButtonBox::rejected, this, &QDialog::reject);

    layout->addLayout(form);
    layout->addWidget(note);
    layout->addWidget(buttons);

    refreshAuthFields();
}

void ProfileDialog::setDialogTitle(const QString& title)
{
    setWindowTitle(title);
}

void ProfileDialog::setProfile(const Profile& profile)
{
    m_nameInput->setText(profile.name);
    m_hostInput->setText(profile.host);
    m_portInput->setValue(profile.port > 0 ? profile.port : 22);
    m_usernameInput->setText(profile.username);
    m_privateKeyPathInput->setText(profile.privateKeyPath);

    const int protocolIndex = m_protocolInput->findText(profile.protocol);
    {
        // Keep stored custom port when loading an existing profile.
        const QSignalBlocker blocker(m_protocolInput);
        m_protocolInput->setCurrentIndex(protocolIndex >= 0 ? protocolIndex : 0);
    }

    const int authModeIndex = m_authModeInput->findText(profile.authMode);
    m_authModeInput->setCurrentIndex(authModeIndex >= 0 ? authModeIndex : 0);

    const int knownHostsIndex = m_knownHostsPolicyInput->findText(profile.knownHostsPolicy);
    m_knownHostsPolicyInput->setCurrentIndex(knownHostsIndex >= 0 ? knownHostsIndex : 0);

    refreshAuthFields();
}

Profile ProfileDialog::profile() const
{
    Profile profile;
    profile.id = -1;
    profile.name = m_nameInput->text().trimmed();
    profile.host = m_hostInput->text().trimmed();
    profile.port = m_portInput->value();
    profile.username = m_usernameInput->text().trimmed();
    profile.protocol = m_protocolInput->currentText();
    profile.authMode = m_authModeInput->currentText();
    profile.privateKeyPath = m_privateKeyPathInput->text().trimmed();
    profile.knownHostsPolicy = m_knownHostsPolicyInput->currentText();
    return profile;
}

void ProfileDialog::accept()
{
    if (m_nameInput->text().trimmed().isEmpty()) {
        QMessageBox::warning(this,
                             QStringLiteral("Validation Error"),
                             QStringLiteral("Profile name is required."));
        return;
    }

    if (m_hostInput->text().trimmed().isEmpty()) {
        QMessageBox::warning(this,
                             QStringLiteral("Validation Error"),
                             QStringLiteral("Host is required."));
        return;
    }

    if (m_protocolInput->currentText() == QStringLiteral("SSH")
        && m_usernameInput->text().trimmed().isEmpty()) {
        QMessageBox::warning(this,
                             QStringLiteral("Validation Error"),
                             QStringLiteral("Username is required for SSH profiles."));
        return;
    }

    QDialog::accept();
}

void ProfileDialog::refreshAuthFields()
{
    const bool isSsh = m_protocolInput->currentText() == QStringLiteral("SSH");
    const bool isPrivateKey = m_authModeInput->currentText() == QStringLiteral("Private Key");

    m_authModeInput->setEnabled(isSsh);
    m_privateKeyPathInput->setEnabled(isSsh && isPrivateKey);
    m_browsePrivateKeyButton->setEnabled(isSsh && isPrivateKey);
    m_knownHostsPolicyInput->setEnabled(isSsh);
}