/******************************************************************************
 * QSkinny - Copyright (C) 2016 Uwe Rathmann
 *           SPDX-License-Identifier: BSD-3-Clause
 *****************************************************************************/

#include "QskSkin.h"

#include "QskAnimationHint.h"
#include "QskAspect.h"
#include "QskColorFilter.h"
#include "QskGraphic.h"
#include "QskGraphicProviderMap.h"
#include "QskSkinHintTable.h"
#include "QskStandardSymbol.h"
#include "QskPlatform.h"

#include "QskMargins.h"

#include <qguiapplication.h>
#include <qpa/qplatformdialoghelper.h>
#include <qpa/qplatformtheme.h>

#include <cmath>
#include <unordered_map>

#include "QskBox.h"
#include "QskBoxSkinlet.h"

#include "QskCheckBox.h"
#include "QskCheckBoxSkinlet.h"

#include "QskComboBox.h"
#include "QskComboBoxSkinlet.h"

#include "QskFocusIndicator.h"
#include "QskFocusIndicatorSkinlet.h"

#include "QskGraphicLabel.h"
#include "QskGraphicLabelSkinlet.h"

#include "QskListView.h"
#include "QskListViewSkinlet.h"

#include "QskMenu.h"
#include "QskMenuSkinlet.h"

#include "QskPageIndicator.h"
#include "QskPageIndicatorSkinlet.h"

#include "QskPopup.h"
#include "QskPopupSkinlet.h"

#include "QskProgressBar.h"
#include "QskProgressBarSkinlet.h"

#include "QskRadioBox.h"
#include "QskRadioBoxSkinlet.h"

#include "QskPushButton.h"
#include "QskPushButtonSkinlet.h"

#include "QskScrollView.h"
#include "QskScrollViewSkinlet.h"

#include "QskSegmentedBar.h"
#include "QskSegmentedBarSkinlet.h"

#include "QskSeparator.h"
#include "QskSeparatorSkinlet.h"

#include "QskSlider.h"
#include "QskSliderSkinlet.h"

#include "QskSpinBox.h"
#include "QskSpinBoxSkinlet.h"

#include "QskSubWindow.h"
#include "QskSubWindowSkinlet.h"

#include "QskSubWindowArea.h"
#include "QskSubWindowAreaSkinlet.h"

#include "QskSwitchButton.h"
#include "QskSwitchButtonSkinlet.h"

#include "QskTabButton.h"
#include "QskTabButtonSkinlet.h"

#include "QskTabView.h"
#include "QskTabViewSkinlet.h"

#include "QskTextLabel.h"
#include "QskTextLabelSkinlet.h"

#include "QskTextInput.h"
#include "QskTextInputSkinlet.h"

#include "QskStatusIndicator.h"
#include "QskStatusIndicatorSkinlet.h"

static inline QskSkinlet* qskNewSkinlet( const QMetaObject* metaObject, QskSkin* skin )
{
    const QByteArray signature = metaObject->className() + QByteArrayLiteral( "(QskSkin*)" );

    QskSkinlet* skinlet = nullptr;

    const int index = metaObject->indexOfConstructor( signature.constData() );
    if ( index >= 0 )
    {
        void* param[] = { &skinlet, &skin };
        metaObject->static_metacall( QMetaObject::CreateInstance, index, param );
    }

    return skinlet;
}

namespace
{
    class SkinletData
    {
      public:
        SkinletData( const QMetaObject* metaObject )
            : metaObject( metaObject )
            , skinlet( nullptr )
        {
        }

        ~SkinletData()
        {
            delete skinlet;
        }

        const QMetaObject* metaObject;
        QskSkinlet* skinlet;
    };
}

class QskSkin::PrivateData
{
  public:
    std::unordered_map< const QMetaObject*, SkinletData > skinletMap;

    QskSkinHintTable hintTable;

    std::unordered_map< int, QFont > fonts;
    std::unordered_map< int, QskColorFilter > graphicFilters;

    QskGraphicProviderMap graphicProviders;
};

QskSkin::QskSkin( QObject* parent )
    : QObject( parent )
    , m_data( new PrivateData() )
{
    declareSkinlet< QskControl, QskSkinlet >();

    declareSkinlet< QskBox, QskBoxSkinlet >();
    declareSkinlet< QskCheckBox, QskCheckBoxSkinlet >();
    declareSkinlet< QskComboBox, QskComboBoxSkinlet >();
    declareSkinlet< QskFocusIndicator, QskFocusIndicatorSkinlet >();
    declareSkinlet< QskGraphicLabel, QskGraphicLabelSkinlet >();
    declareSkinlet< QskListView, QskListViewSkinlet >();
    declareSkinlet< QskPageIndicator, QskPageIndicatorSkinlet >();
    declareSkinlet< QskPopup, QskPopupSkinlet >();
    declareSkinlet< QskMenu, QskMenuSkinlet >();
    declareSkinlet< QskPushButton, QskPushButtonSkinlet >();
    declareSkinlet< QskScrollView, QskScrollViewSkinlet >();
    declareSkinlet< QskSegmentedBar, QskSegmentedBarSkinlet >();
    declareSkinlet< QskSeparator, QskSeparatorSkinlet >();
    declareSkinlet< QskSlider, QskSliderSkinlet >();
    declareSkinlet< QskSpinBox, QskSpinBoxSkinlet >();
    declareSkinlet< QskStatusIndicator, QskStatusIndicatorSkinlet >();
    declareSkinlet< QskSubWindow, QskSubWindowSkinlet >();
    declareSkinlet< QskSubWindowArea, QskSubWindowAreaSkinlet >();
    declareSkinlet< QskSwitchButton, QskSwitchButtonSkinlet >();
    declareSkinlet< QskTabButton, QskTabButtonSkinlet >();
    declareSkinlet< QskTabView, QskTabViewSkinlet >();
    declareSkinlet< QskTextLabel, QskTextLabelSkinlet >();
    declareSkinlet< QskTextInput, QskTextInputSkinlet >();
    declareSkinlet< QskProgressBar, QskProgressBarSkinlet >();
    declareSkinlet< QskRadioBox, QskRadioBoxSkinlet >();

    const QFont font = QGuiApplication::font();
    setupFonts( font.family(), font.weight(), font.italic() );

    const auto noMargins = QVariant::fromValue( QskMargins( 0 ) );

    {
        // some defaults
        const auto aspect = QskAspect::NoSubcontrol | QskAspect::Metric;

        setSkinHint( aspect | QskAspect::Margin, noMargins );
        setSkinHint( aspect | QskAspect::Padding, noMargins );
        setSkinHint( aspect | QskAspect::Spacing, 0 );
    }

    setSkinHint( QskControl::Background | QskAspect::Metric | QskAspect::Padding, noMargins );

    setSkinHint( QskControl::Background | QskAspect::Color,
        QVariant::fromValue( QskGradient() ) );
}

QskSkin::~QskSkin()
{
}

void QskSkin::setSkinHint( QskAspect aspect, const QVariant& skinHint )
{
    m_data->hintTable.setHint( aspect, skinHint );
}

const QVariant& QskSkin::skinHint( QskAspect aspect ) const
{
    return m_data->hintTable.hint( aspect );
}

void QskSkin::declareSkinlet( const QMetaObject* metaObject,
    const QMetaObject* skinletMetaObject )
{
    Q_ASSERT( skinletMetaObject->constructorCount() );

    const auto it = m_data->skinletMap.find( metaObject );

    if ( it != m_data->skinletMap.cend() )
    {
        auto& entry = it->second;
        if ( entry.metaObject != skinletMetaObject )
        {
            entry.metaObject = skinletMetaObject;

            delete entry.skinlet;
            entry.skinlet = nullptr;
        }
    }
    else
    {
        m_data->skinletMap.emplace( metaObject, skinletMetaObject );
    }
}

void QskSkin::setupFonts( const QString& family, int weight, bool italic )
{
    const int sizes[] = { 10, 15, 20, 32, 66 };
    static_assert( sizeof( sizes ) / sizeof( sizes[ 0 ] ) == HugeFont,
        "QskSkin::setupFonts: bad list size." );

    QFont font( family, -1, weight, italic );

    for ( int i = TinyFont; i <= HugeFont; i++ )
    {
        font.setPixelSize( qRound( qskDpToPixels( sizes[i - 1] ) ) );
        m_data->fonts[ i ] = font;
    }

    const QFont appFont( QGuiApplication::font() );
    if ( appFont.pixelSize() > 0 )
        font.setPixelSize( appFont.pixelSize() );
    else
        font.setPointSize( appFont.pointSize() );

    m_data->fonts[ QskSkin::DefaultFont ] = font;
}

void QskSkin::setFont( int fontRole, const QFont& font )
{
    m_data->fonts[ fontRole ] = font;
}

void QskSkin::resetFont( int fontRole )
{
    m_data->fonts.erase( fontRole );
}

QFont QskSkin::font( int fontRole ) const
{
    auto it = m_data->fonts.find( fontRole );
    if ( it != m_data->fonts.cend() )
        return it->second;

    it = m_data->fonts.find( QskSkin::DefaultFont );
    if ( it != m_data->fonts.cend() )
        return it->second;

    return QGuiApplication::font();
}

void QskSkin::setGraphicFilter( int graphicRole, const QskColorFilter& colorFilter )
{
    m_data->graphicFilters[ graphicRole ] = colorFilter;
}

void QskSkin::resetGraphicFilter( int graphicRole )
{
    m_data->graphicFilters.erase( graphicRole );
}

QskColorFilter QskSkin::graphicFilter( int graphicRole ) const
{
    auto it = m_data->graphicFilters.find( graphicRole );
    if ( it != m_data->graphicFilters.cend() )
        return it->second;

    return QskColorFilter();
}

const QskSkinHintTable& QskSkin::hintTable() const
{
    return m_data->hintTable;
}

QskSkinHintTable& QskSkin::hintTable()
{
    return m_data->hintTable;
}

const std::unordered_map< int, QFont >& QskSkin::fonts() const
{
    return m_data->fonts;
}

const std::unordered_map< int, QskColorFilter >& QskSkin::graphicFilters() const
{
    return m_data->graphicFilters;
}

void QskSkin::addGraphicProvider(
    const QString& providerId, QskGraphicProvider* provider )
{
    m_data->graphicProviders.insert( providerId, provider );
}

QskGraphicProvider* QskSkin::graphicProvider( const QString& providerId ) const
{
    return m_data->graphicProviders.provider( providerId );
}

bool QskSkin::hasGraphicProvider() const
{
    return m_data->graphicProviders.size() > 0;
}

QString QskSkin::dialogButtonText( int action ) const
{
    const auto theme = qskPlatformTheme();

    auto text = theme->standardButtonText( action );
    text = QPlatformTheme::removeMnemonics( text );

    return text;
}

const int* QskSkin::dialogButtonLayout( Qt::Orientation orientation ) const
{
    // auto policy = QPlatformDialogHelper::UnknownLayout;
    auto policy = QPlatformDialogHelper::WinLayout;

    if ( const auto theme = qskPlatformTheme() )
    {
        const QVariant v = theme->themeHint( QPlatformTheme::DialogButtonBoxLayout );
        policy = static_cast< QPlatformDialogHelper::ButtonLayout >( v.toInt() );
    }

    return QPlatformDialogHelper::buttonLayout( orientation, policy );
}

QskSkinlet* QskSkin::skinlet( const QMetaObject* metaObject )
{
    while ( metaObject )
    {
        auto it = m_data->skinletMap.find( metaObject );
        if ( it != m_data->skinletMap.cend() )
        {
            auto& entry = it->second;

            if ( entry.skinlet == nullptr )
                entry.skinlet = qskNewSkinlet( entry.metaObject, this );

            return entry.skinlet;
        }

        metaObject = metaObject->superClass();
    }

    static QskSkinlet defaultSkinlet;
    return &defaultSkinlet;
}

void QskSkin::resetColors( const QColor& )
{
}

#include "moc_QskSkin.cpp"