// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include "barinstancing_p.h"

BarInstancing::BarInstancing() {}

BarInstancing::~BarInstancing()
{
    clearDataArray();
}

QByteArray BarInstancing::getInstanceBuffer(int *instanceCount)
{
    if (m_dirty) {
        m_instanceData.resize(0);
        int instanceNumber = 0;

        for (int i = 0; i < m_dataArray.size(); ++i) {
            auto item = m_dataArray.at(i);

            if ((item->color.alphaF() < 1.0) || transparency())
                setDepthSortingEnabled(true);
            else
                setDepthSortingEnabled(false);

            QVector4D customData{};
            customData.setX(item->heightValue);
            if (!item->selectedBar) {
                auto entry = calculateTableEntryFromQuaternion(item->position,
                                                               item->scale,
                                                               item->rotation,
                                                               item->color,
                                                               customData);
                m_instanceData.append(reinterpret_cast<char *>(&entry), sizeof(entry));
            } else {
                // Even selected bars need to be drawn in a very small scale.
                // If this is not done, the program can't find the selected bars in the
                // graph and detects the wrong bars as selected ones.
                auto entry = calculateTableEntryFromQuaternion(item->position,
                                                               QVector3D{.001f, .001f, .001f},
                                                               item->rotation,
                                                               QColor(Qt::white));
                m_instanceData.append(reinterpret_cast<char *>(&entry), sizeof(entry));
            }
            instanceNumber++;
        }
        m_instanceCount = instanceNumber;
        m_dirty = false;
    }

    if (instanceCount)
        *instanceCount = m_instanceCount;

    return m_instanceData;
}

bool BarInstancing::transparency() const
{
    return m_transparency;
}

void BarInstancing::setTransparency(bool newTransparencyValue)
{
    m_transparency = newTransparencyValue;
}

void BarInstancing::clearDataArray()
{
    m_dataArray.clear();
    m_instanceData.clear();
}

void BarInstancing::markDataDirty()
{
    m_dirty = true;
    markDirty();
}

QList<BarItemHolder *> BarInstancing::dataArray() const
{
    return m_dataArray;
}

void BarInstancing::setDataArray(const QList<BarItemHolder *> &newDataArray)
{
    m_dataArray = newDataArray;
    markDataDirty();
}
