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#include "vcsbaseeditorconfig.h"

#include <QComboBox>
#include <QAction>
#include <QHBoxLayout>

#include <QStringList>
#include <QDebug>

namespace VcsBase {

namespace Internal {

class SettingMappingData
{
public:
    enum Type
    {
        Invalid,
        Bool,
        String,
        Int
    };

    SettingMappingData() : boolSetting(0), m_type(Invalid)
    { }

    SettingMappingData(bool *setting) : boolSetting(setting), m_type(Bool)
    { }

    SettingMappingData(QString *setting) : stringSetting(setting), m_type(String)
    { }

    SettingMappingData(int *setting) : intSetting(setting), m_type(Int)
    { }

    Type type() const
    {
        return m_type;
    }

    union {
        bool *boolSetting;
        QString *stringSetting;
        int *intSetting;
    };

private:
    Type m_type;
};

class VcsBaseEditorConfigPrivate
{
public:
    VcsBaseEditorConfigPrivate(QToolBar *toolBar) : m_toolBar(toolBar)
    {
        if (!toolBar)
            return;
        toolBar->setContentsMargins(3, 0, 3, 0);
        toolBar->setToolButtonStyle(Qt::ToolButtonIconOnly);
    }

    QStringList m_baseArguments;
    QList<VcsBaseEditorConfig::OptionMapping> m_optionMappings;
    QHash<QObject *, SettingMappingData> m_settingMapping;
    QToolBar *m_toolBar;
};

} // namespace Internal

/*!
    \class VcsBase::VcsBaseEditorConfig

    \brief The VcsBaseEditorConfig is a widget/action aggregator for use
    with VcsBase::VcsBaseEditor, influencing for example the generation of VCS diff output.

    The class maintains a list of command line arguments (starting from baseArguments())
    which are set according to the state of the inside widgets. A change signal is provided
    that should trigger the rerun of the VCS operation.
*/

VcsBaseEditorConfig::ComboBoxItem::ComboBoxItem(const QString &text, const QVariant &val) :
    displayText(text),
    value(val)
{
}

VcsBaseEditorConfig::VcsBaseEditorConfig(QToolBar *toolBar) :
    QObject(toolBar), d(new Internal::VcsBaseEditorConfigPrivate(toolBar))
{
    connect(this, &VcsBaseEditorConfig::argumentsChanged,
            this, &VcsBaseEditorConfig::handleArgumentsChanged);
}

VcsBaseEditorConfig::~VcsBaseEditorConfig()
{
    delete d;
}

QStringList VcsBaseEditorConfig::baseArguments() const
{
    return d->m_baseArguments;
}

void VcsBaseEditorConfig::setBaseArguments(const QStringList &b)
{
    d->m_baseArguments = b;
}

QAction *VcsBaseEditorConfig::addButton(const QString &label, const QIcon &icon)
{
    auto action = new QAction(icon, label, d->m_toolBar);
    connect(action, &QAction::triggered, this, &VcsBaseEditorConfig::argumentsChanged);
    addAction(action);
    return action;
}

QStringList VcsBaseEditorConfig::arguments() const
{
    // Compile effective arguments
    QStringList args = baseArguments();
    foreach (const OptionMapping &mapping, optionMappings())
        args += argumentsForOption(mapping);
    return args;
}

QAction *VcsBaseEditorConfig::addToggleButton(const QString &option,
                                              const QString &label,
                                              const QString &tooltip)
{
    return addToggleButton(option.isEmpty() ? QStringList() : QStringList(option), label, tooltip);
}

QAction *VcsBaseEditorConfig::addToggleButton(const QStringList &options,
                                              const QString &label,
                                              const QString &tooltip)
{
    auto action = new QAction(label, d->m_toolBar);
    action->setToolTip(tooltip);
    action->setCheckable(true);
    connect(action, &QAction::toggled, this, &VcsBaseEditorConfig::argumentsChanged);
    addAction(action);
    d->m_optionMappings.append(OptionMapping(options, action));
    return action;
}

QComboBox *VcsBaseEditorConfig::addComboBox(const QStringList &options,
                                            const QList<ComboBoxItem> &items)
{
    auto cb = new QComboBox;
    foreach (const ComboBoxItem &item, items)
        cb->addItem(item.displayText, item.value);
    connect(cb, static_cast<void (QComboBox::*)(int)>(&QComboBox::currentIndexChanged),
            this, &VcsBaseEditorConfig::argumentsChanged);
    d->m_toolBar->addWidget(cb);
    d->m_optionMappings.append(OptionMapping(options, cb));
    return cb;
}

void VcsBaseEditorConfig::mapSetting(QAction *button, bool *setting)
{
    if (!d->m_settingMapping.contains(button) && button) {
        d->m_settingMapping.insert(button, Internal::SettingMappingData(setting));
        if (setting) {
            QSignalBlocker blocker(button);
            button->setChecked(*setting);
        }
    }
}

void VcsBaseEditorConfig::mapSetting(QComboBox *comboBox, QString *setting)
{
    if (!d->m_settingMapping.contains(comboBox) && comboBox) {
        d->m_settingMapping.insert(comboBox, Internal::SettingMappingData(setting));
        if (setting) {
            QSignalBlocker blocker(comboBox);
            const int itemIndex = comboBox->findData(*setting);
            if (itemIndex != -1)
                comboBox->setCurrentIndex(itemIndex);
        }
    }
}

void VcsBaseEditorConfig::mapSetting(QComboBox *comboBox, int *setting)
{
    if (d->m_settingMapping.contains(comboBox) || !comboBox)
        return;

    d->m_settingMapping.insert(comboBox, Internal::SettingMappingData(setting));

    if (!setting || *setting < 0 || *setting >= comboBox->count())
        return;

    QSignalBlocker blocker(comboBox);
    comboBox->setCurrentIndex(*setting);
}

void VcsBaseEditorConfig::handleArgumentsChanged()
{
    updateMappedSettings();
    executeCommand();
}

void VcsBaseEditorConfig::executeCommand()
{
    emit commandExecutionRequested();
}

VcsBaseEditorConfig::OptionMapping::OptionMapping(const QString &option, QObject *obj) :
    object(obj)
{
    if (!option.isEmpty())
        options << option;
}

VcsBaseEditorConfig::OptionMapping::OptionMapping(const QStringList &optionList, QObject *obj) :
    options(optionList),
    object(obj)
{
}

const QList<VcsBaseEditorConfig::OptionMapping> &VcsBaseEditorConfig::optionMappings() const
{
    return d->m_optionMappings;
}

QStringList VcsBaseEditorConfig::argumentsForOption(const OptionMapping &mapping) const
{
    const QAction *action = qobject_cast<const QAction *>(mapping.object);
    if (action && action->isChecked())
        return mapping.options;

    const QComboBox *cb = qobject_cast<const QComboBox *>(mapping.object);
    if (cb) {
        const QString value = cb->itemData(cb->currentIndex()).toString();
        QStringList args;
        foreach (const QString &option, mapping.options)
            args << option.arg(value);
        return args;
    }

    return QStringList();
}

void VcsBaseEditorConfig::updateMappedSettings()
{
    foreach (const OptionMapping &optMapping, d->m_optionMappings) {
        if (d->m_settingMapping.contains(optMapping.object)) {
            Internal::SettingMappingData& settingData = d->m_settingMapping[optMapping.object];
            switch (settingData.type()) {
            case Internal::SettingMappingData::Bool :
            {
                if (auto action = qobject_cast<const QAction *>(optMapping.object))
                    *settingData.boolSetting = action->isChecked();
                break;
            }
            case Internal::SettingMappingData::String :
            {
                const QComboBox *cb = qobject_cast<const QComboBox *>(optMapping.object);
                if (cb && cb->currentIndex() != -1)
                    *settingData.stringSetting = cb->itemData(cb->currentIndex()).toString();
                break;
            }
            case Internal::SettingMappingData::Int:
            {
                const QComboBox *cb = qobject_cast<const QComboBox *>(optMapping.object);
                if (cb && cb->currentIndex() != -1)
                    *settingData.intSetting = cb->currentIndex();
                break;
            }
            case Internal::SettingMappingData::Invalid : break;
            } // end switch ()
        }
    }
}

void VcsBaseEditorConfig::addAction(QAction *action)
{
    const QList<QAction *> actions = d->m_toolBar->actions();
    // Insert the action before line/column and split actions.
    d->m_toolBar->insertAction(actions.at(qMax(actions.count() - 2, 0)), action);
}

} // namespace VcsBase