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#include "changeselectiondialog.h"
#include "gitplugin.h"
#include "gitclient.h"

#include <QFileDialog>
#include <QMessageBox>
#include <QProcess>

namespace Git {
namespace Internal {

ChangeSelectionDialog::ChangeSelectionDialog(const QString &workingDirectory, QWidget *parent)
    : QDialog(parent)
    , m_process(0)
{
    m_ui.setupUi(this);
    if (!workingDirectory.isEmpty()) {
        setWorkingDirectory(workingDirectory);
        m_ui.workingDirectoryButton->setEnabled(false);
        m_ui.workingDirectoryEdit->setEnabled(false);
    }
    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
    connect(m_ui.workingDirectoryButton, SIGNAL(clicked()), this, SLOT(selectWorkingDirectory()));
    setWindowTitle(tr("Select a Git Commit"));

    bool ok;
    m_gitBinaryPath = GitPlugin::instance()->gitClient()->gitBinaryPath(&ok);
    if (!ok)
        return;

    m_gitEnvironment = GitPlugin::instance()->gitClient()->processEnvironment();
    connect(m_ui.changeNumberEdit, SIGNAL(textChanged(QString)),
            this, SLOT(recalculateDetails(QString)));
    recalculateDetails(m_ui.changeNumberEdit->text());
}

ChangeSelectionDialog::~ChangeSelectionDialog()
{
    delete m_process;
}

QString ChangeSelectionDialog::change() const
{
    return m_ui.changeNumberEdit->text();
}

QString ChangeSelectionDialog::workingDirectory() const
{
    return m_ui.workingDirectoryEdit->text();
}

void ChangeSelectionDialog::setWorkingDirectory(const QString &s)
{
    if (s.isEmpty())
        return;
    m_ui.workingDirectoryEdit->setText(QDir::toNativeSeparators(s));
    m_ui.changeNumberEdit->setFocus(Qt::ActiveWindowFocusReason);
    m_ui.changeNumberEdit->setText(QLatin1String("HEAD"));
    m_ui.changeNumberEdit->selectAll();
}

void ChangeSelectionDialog::selectWorkingDirectory()
{
    QString location = QFileDialog::getExistingDirectory(this, tr("Select Working Directory"),
                                                         m_ui.workingDirectoryEdit->text());
    if (location.isEmpty())
        return;

    // Verify that the location is a repository
    // We allow specifying a directory, which is not the head directory of the repository.
    // This is useful for git show commit:./file
    QString topLevel = GitPlugin::instance()->gitClient()->findRepositoryForDirectory(location);
    if (!topLevel.isEmpty())
        m_ui.workingDirectoryEdit->setText(location);
    else // Did not find a repo
        QMessageBox::critical(this, tr("Error"),
                              tr("Selected directory is not a Git repository."));
}

//! Set commit message in details
void ChangeSelectionDialog::setDetails(int exitCode)
{
    if (exitCode == 0)
        m_ui.detailsText->setPlainText(QString::fromUtf8(m_process->readAllStandardOutput()));
    else
        m_ui.detailsText->setPlainText(tr("Error: Unknown reference"));
}

void ChangeSelectionDialog::recalculateDetails(const QString &ref)
{
    if (m_process) {
        m_process->kill();
        m_process->waitForFinished();
        delete m_process;
    }

    QStringList args;
    args << QLatin1String("log") << QLatin1String("-n1") << ref;

    m_process = new QProcess(this);
    m_process->setWorkingDirectory(workingDirectory());
    m_process->setProcessEnvironment(m_gitEnvironment);

    connect(m_process, SIGNAL(finished(int)), this, SLOT(setDetails(int)));

    m_process->start(m_gitBinaryPath, args);
    m_process->closeWriteChannel();
    if (!m_process->waitForStarted())
        m_ui.detailsText->setPlainText(tr("Error: Could not start Git."));
    else
        m_ui.detailsText->setPlainText(tr("Fetching commit data..."));
}

} // Internal
} // Git