#include "TimeChartPage.h"
#include "StatisticsParams.h"
#include "../charts/TimeChart.h"
#include "../dictionary/CardPack.h"

TimeChartPage::TimeChartPage(const StatisticsParams* statParams):
    BaseStatPage(statParams)
{
}

QWidget* TimeChartPage::createChart()
{
    chart = new TimeChart;
    chart->setLabels(tr("Date"), tr("Cards"));
    return chart;
}

void TimeChartPage::updateDataSet()
{
    QList<QDateTime> dates = getDates(statParams->getCardPack());
    int period = statParams->getTimePeriod();
    if(period == -1)
        period = getStudyPeriodLength(dates);
    int reviewsNum = getReviewsNum(dates, period);
    totalReviewsLabel->setText(tr("Total: %1").arg(reviewsNum));
    chart->setDates(dates, period, getDataDirection());
}

int TimeChartPage::getStudyPeriodLength(const QList<QDateTime>& dates) const
{
    const int minPeriod = 7;
    QDateTime minDate = QDateTime::currentDateTime();
    QDateTime maxDate = minDate;
    foreach(QDateTime date, dates)
        if(date < minDate)
            minDate = date;
        else if(date > maxDate)
                maxDate = date;
    int res = minDate.daysTo(maxDate) + 1;
    if(res < minPeriod)
        res = minPeriod;
    return res;
}

int TimeChartPage::getReviewsNum(const QList<QDateTime>& dates,
    int period) const
{
    QDateTime curDate = QDateTime::currentDateTime();
    int res = 0;
    foreach(QDateTime date, dates)
        if(qAbs(date.daysTo(curDate)) < period)
            res++;
    return res;
}