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

#include <QProcess>
#include <QFormLayout>
#include <QSpacerItem>
#include <QFormLayout>
#include <QHBoxLayout>
#include <QPushButton>
#include <QLabel>
#include <QLineEdit>
#include <QPlainTextEdit>

namespace Git {
namespace Internal {

ChangeSelectionDialog::ChangeSelectionDialog(const QString &workingDirectory, QWidget *parent)
    : QDialog(parent)
    , m_process(0)
    , m_workingDirectoryLabel(new QLabel(workingDirectory, this))
    , m_changeNumberEdit(new QLineEdit(this))
    , m_detailsText(new QPlainTextEdit(this))
    , m_showButton(new QPushButton(tr("Show"), this))
    , m_cherryPickButton(new QPushButton(tr("Cherry Pick"), this))
    , m_revertButton(new QPushButton(tr("Revert"), this))
    , m_checkoutButton(new QPushButton(tr("Checkout"), this))
    , m_cancelButton(new QPushButton(tr("Cancel"), this))
    , m_command(NoCommand)
{
    bool ok;
    m_gitBinaryPath = GitPlugin::instance()->gitClient()->gitBinaryPath(&ok);
    if (!ok)
        return;

    QGridLayout* layout = new QGridLayout(this);
    layout->addWidget(new QLabel(tr("Working Directory:"), this), 0, 0 , 1, 1);
    layout->addWidget(m_workingDirectoryLabel, 0, 1, 1, 1);
    layout->addWidget(new QLabel(tr("Change:"), this),1, 0, 1, 1);
    layout->addWidget(m_changeNumberEdit, 1, 1, 1, 1);
    layout->addWidget(m_detailsText, 2, 0, 1, 2);

    QHBoxLayout* buttonsLine = new QHBoxLayout();
    buttonsLine->addWidget(m_cancelButton);
    buttonsLine->addStretch();
    buttonsLine->addWidget(m_checkoutButton);
    buttonsLine->addWidget(m_revertButton);
    buttonsLine->addWidget(m_cherryPickButton);
    buttonsLine->addWidget(m_showButton);

    layout->addLayout(buttonsLine, 3, 0 ,1 ,2);

    m_changeNumberEdit->setFocus(Qt::ActiveWindowFocusReason);
    m_changeNumberEdit->setText(QLatin1String("HEAD"));
    m_changeNumberEdit->selectAll();

    setWindowTitle(tr("Select a Git Commit"));
    setGeometry(0, 0, 550, 350);
    adjustPosition(parent);

    m_gitEnvironment = GitPlugin::instance()->gitClient()->processEnvironment();
    connect(m_changeNumberEdit, SIGNAL(textChanged(QString)),
            this, SLOT(recalculateDetails(QString)));
    connect(m_showButton, SIGNAL(clicked()), this, SLOT(acceptShow()));
    connect(m_cherryPickButton, SIGNAL(clicked()), this, SLOT(acceptCherryPick()));
    connect(m_revertButton, SIGNAL(clicked()), this, SLOT(acceptRevert()));
    connect(m_checkoutButton, SIGNAL(clicked()), this, SLOT(acceptCheckout()));
    connect(m_cancelButton, SIGNAL(clicked()), this, SLOT(reject()));

    recalculateDetails(m_changeNumberEdit->text());
}

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

QString ChangeSelectionDialog::change() const
{
    return m_changeNumberEdit->text();
}

QString ChangeSelectionDialog::workingDirectory() const
{
    return m_workingDirectoryLabel->text();
}

ChangeCommand ChangeSelectionDialog::command() const
{
    return m_command;
}

void ChangeSelectionDialog::acceptCheckout()
{
    m_command = Checkout;
    accept();
}

void ChangeSelectionDialog::acceptCherryPick()
{
    m_command = CherryPick;
    accept();
}

void ChangeSelectionDialog::acceptRevert()
{
    m_command = Revert;
    accept();
}

void ChangeSelectionDialog::acceptShow()
{
    m_command = Show;
    accept();
}

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

void ChangeSelectionDialog::enableButtons(bool b)
{
    m_showButton->setEnabled(b);
    m_cherryPickButton->setEnabled(b);
    m_revertButton->setEnabled(b);
}

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

    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_detailsText->setPlainText(tr("Error: Could not start Git."));
    else
        m_detailsText->setPlainText(tr("Fetching commit data..."));
}

} // Internal
} // Git