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#include "branchadddialog.h"
#include "ui_branchadddialog.h"

#include <utils/hostosinfo.h>

#include <QPushButton>
#include <QValidator>

namespace Git {
namespace Internal {

/*!
 * \brief The BranchNameValidator class validates the corresponding string as
 * a valid Git branch name.
 *
 * The class does this by a couple of rules that are applied on the string.
 *
 */
class BranchNameValidator : public QValidator
{
public:
    BranchNameValidator(const QStringList &localBranches, QObject *parent = 0) :
        QValidator(parent),
        m_invalidChars(QLatin1String(
                                   "\\s"          // no whitespace
                                   "|~"         // no "~"
                                   "|\\^"       // no "^"
                                   "|\\["       // no "["
                                   "|\\.\\."    // no ".."
                                   "|/\\."      // no slashdot
                                   "|:"         // no ":"
                                   "|@\\{"      // no "@{" sequence
                                   "|\\\\"      // no backslash
                                   "|//"    // no double slash
                                   "|^[/-]"  // no leading slash or dash
                                   )),
        m_localBranches(localBranches)
    {
    }

    ~BranchNameValidator() {}

    State validate(QString &input, int &pos) const
    {
        Q_UNUSED(pos)

        // NoGos

        if (input.contains(m_invalidChars))
            return Invalid;


        // "Intermediate" patterns, may change to Acceptable when user edits further:

        if (input.endsWith(QLatin1String(".lock"))) //..may not end with ".lock"
            return Intermediate;

        if (input.endsWith(QLatin1Char('.'))) // no dot at the end (but allowed in the middle)
            return Intermediate;

        if (input.endsWith(QLatin1Char('/'))) // no slash at the end (but allowed in the middle)
            return Intermediate;

        if (m_localBranches.contains(input, Utils::HostOsInfo::isWindowsHost()
                                     ? Qt::CaseInsensitive : Qt::CaseSensitive)) {
            return Intermediate;
        }

        // is a valid branch name
        return Acceptable;
    }

private:
    const QRegExp m_invalidChars;
    QStringList m_localBranches;
};


BranchAddDialog::BranchAddDialog(const QStringList &localBranches, bool addBranch, QWidget *parent) :
    QDialog(parent),
    m_ui(new Ui::BranchAddDialog)
{
    m_ui->setupUi(this);
    setWindowTitle(addBranch ? tr("Add Branch") : tr("Rename Branch"));
    m_ui->branchNameEdit->setValidator(new BranchNameValidator(localBranches, this));
    connect(m_ui->branchNameEdit, SIGNAL(textChanged(QString)), this, SLOT(updateButtonStatus()));
}

BranchAddDialog::~BranchAddDialog()
{
    delete m_ui;
}

void BranchAddDialog::setBranchName(const QString &n)
{
    m_ui->branchNameEdit->setText(n);
    m_ui->branchNameEdit->selectAll();
}

QString BranchAddDialog::branchName() const
{
    return m_ui->branchNameEdit->text();
}

void BranchAddDialog::setTrackedBranchName(const QString &name, bool remote)
{
    m_ui->trackingCheckBox->setVisible(true);
    if (!name.isEmpty()) {
        m_ui->trackingCheckBox->setText(remote ? tr("Track remote branch \'%1\'").arg(name) :
                                                 tr("Track local branch \'%1\'").arg(name));
        m_ui->trackingCheckBox->setChecked(remote);
    } else {
        m_ui->trackingCheckBox->setVisible(false);
        m_ui->trackingCheckBox->setChecked(false);
    }
}

bool BranchAddDialog::track()
{
    return m_ui->trackingCheckBox->isChecked();
}

/*! Updates the ok button enabled state of the dialog according to the validity of the branch name. */
void BranchAddDialog::updateButtonStatus()
{
    m_ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(m_ui->branchNameEdit->hasAcceptableInput());
}

} // namespace Internal
} // namespace Git