#pragma once

#include "blobgroup2.hpp"

#include <qmatrix4x4.h>
#include <qquickitem.h>

class BlobGroup2;

// Data-only shape.
//
// The group draws a single node for the whole group, so a shape here contributes
// only what the shader needs: position, radii, exclusion, physics. A shape does
// not create a render node, so no pixel can be evaluated by one shape and missed
// by another.
class BlobShape2 : public QQuickItem {
	Q_OBJECT
	Q_PROPERTY(BlobGroup2* group READ group WRITE setGroup NOTIFY groupChanged)
	Q_PROPERTY(qreal radius READ radius WRITE setRadius NOTIFY radiusChanged)
	Q_PROPERTY(
		QMatrix4x4 deformMatrix READ deformMatrix NOTIFY deformMatrixChanged)
	Q_PROPERTY(
		QMatrix4x4 rawDeformMatrix READ rawDeformMatrix NOTIFY
			rawDeformMatrixChanged)

	friend class BlobGroup2;

	public:
	explicit BlobShape2(QQuickItem* parent = nullptr);
	~BlobShape2() override = default;

	[[nodiscard]] BlobGroup2* group() const { return m_group; }

	void setGroup(BlobGroup2* g);

	[[nodiscard]] qreal radius() const { return m_radius; }

	void setRadius(qreal r);

	[[nodiscard]] QMatrix4x4 deformMatrix() const {
		return m_centeredDeformMatrix;
	}

	[[nodiscard]] QMatrix4x4 rawDeformMatrix() const { return m_deformMatrix; }

	signals:
	void groupChanged();
	void radiusChanged();
	void deformMatrixChanged();
	void rawDeformMatrixChanged();

	protected:
	void componentComplete() override;
	void geometryChange(
		const QRectF& newGeometry, const QRectF& oldGeometry) override;

	virtual bool isExcluded(const BlobShape2*) const { return false; }

	// Whether this shape is currently pushing on a border. Only the shape that is pushing
	// can shape the bar edge, so this decides the source flag.
	virtual bool isMoving() const { return false; }

	virtual bool isCornerExcluded(const BlobShape2* /*other*/) const {
		return false;
	}

	virtual void cornerRadii(float out[4]) const;

	// Called by the group when it rebuilds the shared data, once per frame.
	virtual void updatePhysics() {}

	virtual void registerWithGroup();
	virtual void unregisterFromGroup();
	void updateCenteredDeformMatrix();

	BlobGroup2* m_group = nullptr;
	qreal m_radius = 0;
	QMatrix4x4 m_deformMatrix; // identity by default
	QMatrix4x4 m_centeredDeformMatrix;
};