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**
** Copyright 2021 Edelhirsch Software GmbH. All rights reserved.
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** modification, are permitted provided that the following conditions are
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**     notice, this list of conditions and the following disclaimer.
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****************************************************************************/

#include "UsageDiagram.h"

#include "Diagram.h"

#include <QskBoxBorderColors.h>
#include <QskBoxBorderMetrics.h>
#include <QskBoxShapeMetrics.h>
#include <QskGridBox.h>
#include <QskSkin.h>
#include <QskTextLabel.h>

#include <QPainter>
#include <QPainterPath>

#include <cmath>

QSK_SUBCONTROL( WeekdayLabel, Panel )
QSK_SUBCONTROL( WeekdayLabel, Text )
QSK_SUBCONTROL( WeekdayBox, Panel )

QSK_SUBCONTROL( CaptionColorBox, Panel )

QSK_SUBCONTROL( CaptionItem, Panel )
QSK_STATE( CaptionItem, Water, ( QskAspect::FirstUserState << 1 ) )
QSK_STATE( CaptionItem, Electricity, ( QskAspect::FirstUserState << 2 ) )
QSK_STATE( CaptionItem, Gas, ( QskAspect::FirstUserState << 3 ) )

QSK_SUBCONTROL( CaptionBox, Panel )

QSK_SUBCONTROL( UsageDiagram, Panel )

CaptionItem::CaptionItem( QskAspect::State state, QQuickItem* parent )
    : QskLinearBox( Qt::Horizontal, parent )
{
    setSpacing( 10 );
    auto* box = new CaptionColorBox( this );
    box->setSkinState( state );

    QString text;

    if( state == CaptionItem::Water )
    {
        text = "Water";
    }
    else if( state == CaptionItem::Electricity )
    {
        text = "Electricity";
    }
    else if( state == CaptionItem::Gas )
    {
        text = "Gas";
    }

    auto* textLabel = new QskTextLabel( text, this );
    textLabel->setFontRole( QskSkin::TinyFont );

    const qreal size = metric( CaptionColorBox::Panel | QskAspect::Size );
    box->setFixedSize( {size, size} );
}


static constexpr int segments = 7;

UsageDiagram::UsageDiagram( QQuickItem* parent )
    : Box( "", parent )
    , m_diagram( new Diagram( this ) )
    , m_weekdays( new QskGridBox( this ) )
{
    setAutoAddChildren( false );
    setAutoLayoutChildren( true );

    int number = 100;

    // These values are calculated with a boost::math::cubic_b_spline.
    // We just output the values here to get rid of the dependency:
    std::vector< std::vector<qreal> > yValues =
    {
        {64.00, 64.00, 64.00, 64.00, 64.00, 64.00, 64.00, 64.00, 64.00, 64.00, 64.00, 63.99, 63.96, 63.85, 63.64, 63.30, 62.79, 62.09, 61.14, 59.93, 58.42, 56.59, 54.50, 52.23, 49.84, 47.42, 45.03, 42.76, 40.68, 38.85, 37.36, 36.27, 35.55, 35.19, 35.14, 35.39, 35.91, 36.65, 37.60, 38.73, 40.00, 41.39, 42.87, 44.41, 46.00, 47.60, 49.19, 50.76, 52.26, 53.68, 55.00, 56.19, 57.24, 58.15, 58.90, 59.51, 59.95, 60.23, 60.33, 60.26, 60.00, 59.56, 58.94, 58.17, 57.27, 56.24, 55.12, 53.92, 52.65, 51.34, 50.00, 48.65, 47.32, 46.03, 44.79, 43.65, 42.61, 41.70, 40.95, 40.37, 40.00, 39.85, 39.94, 40.26, 40.84, 41.67, 42.77, 44.15, 45.80, 47.75, 50.00, 52.54, 55.30, 58.19, 61.13, 64.04, 66.82, 69.40, 71.67, 73.57},
        {36.00, 36.01, 36.11, 36.37, 36.88, 37.73, 38.98, 40.73, 43.07, 46.06, 49.80, 54.31, 59.38, 64.73, 70.09, 75.20, 79.77, 83.55, 86.24, 87.59, 87.33, 85.26, 81.61, 76.64, 70.67, 63.98, 56.86, 49.61, 42.52, 35.89, 30.00, 25.09, 21.14, 18.08, 15.83, 14.31, 13.45, 13.16, 13.37, 14.01, 15.00, 16.26, 17.73, 19.36, 21.07, 22.82, 24.55, 26.19, 27.68, 28.97, 30.00, 30.73, 31.25, 31.65, 32.04, 32.52, 33.21, 34.19, 35.58, 37.48, 40.00, 43.17, 46.80, 50.61, 54.33, 57.71, 60.47, 62.35, 63.07, 62.38, 60.00, 55.79, 50.12, 43.46, 36.31, 29.13, 22.43, 16.68, 12.37, 9.98, 10.00, 12.73, 17.76, 24.50, 32.36, 40.75, 49.09, 56.77, 63.21, 67.81, 70.00, 69.37, 66.28, 61.29, 54.96, 47.85, 40.51, 33.50, 27.37, 22.68},
        {43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.50, 43.51, 43.59, 43.80, 44.20, 44.87, 45.86, 47.25, 49.10, 51.47, 54.43, 58.01, 62.05, 66.38, 70.80, 75.12, 79.16, 82.73, 85.64, 87.70, 88.73, 88.60, 87.42, 85.34, 82.55, 79.20, 75.47, 71.51, 67.51, 63.61, 60.00, 56.80, 54.04, 51.68, 49.71, 48.11, 46.86, 45.95, 45.35, 45.04, 45.00, 45.22, 45.71, 46.46, 47.50, 48.82, 50.43, 52.35, 54.58, 57.13, 60.00, 63.17, 66.45, 69.62, 72.46, 74.74, 76.24, 76.74, 76.01, 73.84, 70.00, 64.39, 57.37, 49.45, 41.12, 32.86, 25.18, 18.56, 13.49, 10.48}
    };

    for( int i = 0; i < 3; ++i )
    {
        auto y = yValues[i];

        QVector<QPointF> dataPoints;
        dataPoints.reserve( number );

        for( int x = 0; x < number; ++x )
        {
            QPointF p( x, y[x] );

            dataPoints.append( p );
        }

        m_diagram->addDataPoints( dataPoints, Diagram::Area );
    }

    m_diagram->setYMax( 100 );
    addItem( m_diagram );


    m_weekdays->setSpacing( 0 );
    QStringList weekdays = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};

    for( int i = 0; i < segments; ++i )
    {
        auto* box = new WeekdayBox( m_weekdays );
        m_weekdays->addItem( box, 0, i );
        auto* label = new WeekdayLabel( weekdays.at( i ), m_weekdays );
        m_weekdays->addItem( label, 1, i );
    }

    addItem( m_weekdays, Qt::AlignBottom );

    m_captionBox = new CaptionBox( this );
    addItem( m_captionBox, Qt::AlignRight );
    m_captionBox->setSizePolicy( QskSizePolicy::Maximum, QskSizePolicy::Maximum );
    m_captionBox->setSpacing( 30 );
    m_captionBox->addItem( new CaptionItem( CaptionItem::Water, this ) );
    m_captionBox->addItem( new CaptionItem( CaptionItem::Electricity, this ) );
    m_captionBox->addItem( new CaptionItem( CaptionItem::Gas, this ) );
}

void UsageDiagram::updateLayout()
{
    auto weekdaysHeight = m_weekdays->preferredSize().height();
    m_diagram->setHeight( m_diagram->height() - weekdaysHeight );
    const qreal captionX = width() - m_captionBox->width();
    m_captionBox->setPosition( {captionX, 0} );
}

#include "Diagram.moc"