// SPDX-FileCopyrightText: 2021 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#include "DropShadow.h"

#include <QLinearGradient>
#include <QPainter>

void
DropShadow::draw(QPainter &painter,
                 qint16 margin,
                 qreal radius,
                 QColor start,
                 QColor end,
                 qreal startPosition,
                 qreal endPosition0,
                 qreal endPosition1,
                 qreal width,
                 qreal height)
{
    painter.setPen(Qt::NoPen);

    QLinearGradient gradient;
    gradient.setColorAt(startPosition, start);
    gradient.setColorAt(endPosition0, end);

    // Right
    QPointF right0(width - margin, height / 2);
    QPointF right1(width, height / 2);
    gradient.setStart(right0);
    gradient.setFinalStop(right1);
    painter.setBrush(QBrush(gradient));
    // Deprecated in 5.13: painter.drawRoundRect(
    //  QRectF(QPointF(width - margin * radius, margin), QPointF(width, height -
    //  margin)), 0.0, 0.0);
    painter.drawRoundedRect(
      QRectF(QPointF(width - margin * radius, margin), QPointF(width, height - margin)), 0.0, 0.0);

    // Left
    QPointF left0(margin, height / 2);
    QPointF left1(0, height / 2);
    gradient.setStart(left0);
    gradient.setFinalStop(left1);
    painter.setBrush(QBrush(gradient));
    painter.drawRoundedRect(
      QRectF(QPointF(margin * radius, margin), QPointF(0, height - margin)), 0.0, 0.0);

    // Top
    QPointF top0(width / 2, margin);
    QPointF top1(width / 2, 0);
    gradient.setStart(top0);
    gradient.setFinalStop(top1);
    painter.setBrush(QBrush(gradient));
    painter.drawRoundedRect(QRectF(QPointF(width - margin, 0), QPointF(margin, margin)), 0.0, 0.0);

    // Bottom
    QPointF bottom0(width / 2, height - margin);
    QPointF bottom1(width / 2, height);
    gradient.setStart(bottom0);
    gradient.setFinalStop(bottom1);
    painter.setBrush(QBrush(gradient));
    painter.drawRoundedRect(
      QRectF(QPointF(margin, height - margin), QPointF(width - margin, height)), 0.0, 0.0);

    // BottomRight
    QPointF bottomright0(width - margin, height - margin);
    QPointF bottomright1(width, height);
    gradient.setStart(bottomright0);
    gradient.setFinalStop(bottomright1);
    gradient.setColorAt(endPosition1, end);
    painter.setBrush(QBrush(gradient));
    painter.drawRoundedRect(QRectF(bottomright0, bottomright1), 0.0, 0.0);

    // BottomLeft
    QPointF bottomleft0(margin, height - margin);
    QPointF bottomleft1(0, height);
    gradient.setStart(bottomleft0);
    gradient.setFinalStop(bottomleft1);
    gradient.setColorAt(endPosition1, end);
    painter.setBrush(QBrush(gradient));
    painter.drawRoundedRect(QRectF(bottomleft0, bottomleft1), 0.0, 0.0);

    // TopLeft
    QPointF topleft0(margin, margin);
    QPointF topleft1(0, 0);
    gradient.setStart(topleft0);
    gradient.setFinalStop(topleft1);
    gradient.setColorAt(endPosition1, end);
    painter.setBrush(QBrush(gradient));
    painter.drawRoundedRect(QRectF(topleft0, topleft1), 0.0, 0.0);

    // TopRight
    QPointF topright0(width - margin, margin);
    QPointF topright1(width, 0);
    gradient.setStart(topright0);
    gradient.setFinalStop(topright1);
    gradient.setColorAt(endPosition1, end);
    painter.setBrush(QBrush(gradient));
    painter.drawRoundedRect(QRectF(topright0, topright1), 0.0, 0.0);

    // Widget
    painter.setBrush(QBrush(QColor(0xff, 0xff, 0xff)));
    painter.setRenderHint(QPainter::Antialiasing);
    painter.drawRoundedRect(
      QRectF(QPointF(margin, margin), QPointF(width - margin, height - margin)), radius, radius);
}