// bigintwidget.cpp

#include <QLayout>
#include <QMouseEvent>
#include <QtConcurrent/QtConcurrent>

#include "bigintwidget.h"

BigintWidget::BigintWidget(QWidget *parent)
:   QWidget(parent),
    fw(new QFutureWatcher<MandelResultCell>(this)),
    meta(8192, QSize(1800, 1000)),
    img_label(new QLabel(this)),
    img_dirty(true)
{
    connect(
        fw,
        &QFutureWatcher<MandelResultCell>::resultReadyAt,
        this,
        &BigintWidget::finished_cell
    );
    connect(
        fw,
        &QFutureWatcher<MandelResultCell>::finished,
        this,
        &BigintWidget::finished
    );
    fw->setFuture(QtConcurrent::mapped(meta.get_cells(), MandelMeta::iterate));
    setLayout(new QVBoxLayout());
    layout()->addWidget(img_label);
    img_label->setMinimumSize(meta.get_size());
}

BigintWidget::~BigintWidget() {
    fw->cancel();
    fw->waitForFinished();
}

void BigintWidget::finished_cell(int num) {
    meta.finished_cell(num, fw->resultAt(num));
    img_dirty = true;
    update();
}

void BigintWidget::finished() {
    img_dirty = true;
    update();
}

void BigintWidget::paintEvent(QPaintEvent *event) {
    if (img_dirty) {
        img_label->setPixmap(meta.get_pixmap());
        img_dirty = false;
    }
}

void BigintWidget::mousePressEvent(QMouseEvent *event) {
    if (!fw->isFinished() || event->button() != Qt::MouseButton::LeftButton)
        return;
    QPoint pos = img_label->mapFromParent(event->pos());
    if (pos.x() < 0 || pos.x() >= meta.get_width()
            || pos.y() < 0 || pos.y() >= meta.get_height())
        return;
    meta.zoom2x(pos);
    fw->setFuture(QtConcurrent::mapped(meta.get_cells(), MandelMeta::iterate));
    img_dirty = true;
    update();
}