//productsmodel.cpp

#include "productsmodel.h"
#include "products.h"
#include "product.h"
#include <QDebug>
#include <cstdlib>
#include <QDateTime>

ProductsModel::ProductsModel(Products *products, QObject *parent) : QAbstractTableModel(parent), m_products(products)
{
    srand(QDateTime::currentMSecsSinceEpoch());
    connect(products, SIGNAL(updated()), this, SIGNAL(layoutChanged()));
}

int ProductsModel::rowCount(const QModelIndex&) const
{
    return m_products->count();
}

int ProductsModel::columnCount(const QModelIndex&) const
{
    return 5;
}

QVariant ProductsModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();

    if (role == Qt::DisplayRole)
    {
        Product *prod = m_products->at(index.row());
        switch (index.column())
        {
        case 0:
            return m_products->at(index.row())->name();
        case 1:
            return QString::fromLocal8Bit("%1 €").arg(prod->price());
        case 2:
            return rand()% 1000 + 1;
        case 3:
            {
                double diff = prod->price()-prod->oldPrice();
                QString plop = QString("%1").arg(diff, 0 ,'f', 2);
                if (diff >= 0)
                    plop = "+"+plop;
                return plop;
            }
        case 4:
            {
                double ratio = (prod->price()-prod->oldPrice())/prod->oldPrice()*100;
                QChar c(0x2666);
                if (ratio > 0)
                    c = QChar(0x25b2);
                if (ratio < 0)
                    c = QChar(0x25bc);
                return QString("%1 %2%").arg(c).arg(ratio, 0 ,'f', 1);
            }
        default:
            return QVariant();
        }
    }
    if (role == Qt::TextAlignmentRole)
    {
        switch (index.column())
        {
        case 0:
            return static_cast<int>(Qt::AlignLeft|Qt::AlignVCenter);
        default:
            return static_cast<int>(Qt::AlignRight|Qt::AlignVCenter);
        }
    }
    return QVariant();
}

Qt::ItemFlags ProductsModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::NoItemFlags;
    else
        return Qt::ItemIsEnabled;
}

QVariant ProductsModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (orientation == Qt::Horizontal)
    {
        switch (section)
        {
        case 1:
            return "Prix";
        case 2:
            return "Cote";
        case 3:
            return "Différence";
        case 4:
            return "Variation";
        }
    }
    return QVariant();
}