/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#pragma once

#include "media/view/media_view_overlay_renderer.h"
#include "ui/gl/gl_image.h"
#include "ui/gl/gl_primitives.h"

#include <QOpenGLBuffer>

namespace Media::View {

class OverlayWidget::RendererGL final
	: public OverlayWidget::Renderer
	, public base::has_weak_ptr {
public:
	explicit RendererGL(not_null<OverlayWidget*> owner);

	void init(
		not_null<QOpenGLWidget*> widget,
		QOpenGLFunctions &f) override;

	void deinit(
		not_null<QOpenGLWidget*> widget,
		QOpenGLFunctions *f) override;

	void paint(
		not_null<QOpenGLWidget*> widget,
		QOpenGLFunctions &f) override;

	std::optional<QColor> clearColor() override;

private:
	struct Control {
		int index = -1;
		not_null<const style::icon*> icon;
	};
	bool handleHideWorkaround(QOpenGLFunctions &f);

	void paintBackground() override;
	void paintTransformedVideoFrame(ContentGeometry geometry) override;
	void paintTransformedStaticContent(
		const QImage &image,
		ContentGeometry geometry,
		bool semiTransparent,
		bool fillTransparentBackground,
		int index = 0) override;
	void paintTransformedContent(
		not_null<QOpenGLShaderProgram*> program,
		ContentGeometry geometry,
		bool fillTransparentBackground);
	void paintRadialLoading(
		QRect inner,
		bool radial,
		float64 radialOpacity) override;
	void paintThemePreview(QRect outer) override;
	void paintDocumentBubble(QRect outer, QRect icon) override;
	void paintSaveMsg(QRect outer) override;
	void paintControlsStart() override;
	void paintControl(
		Over control,
		QRect over,
		float64 overOpacity,
		QRect inner,
		float64 innerOpacity,
		const style::icon &icon) override;
	void paintFooter(QRect outer, float64 opacity) override;
	void paintCaption(QRect outer, float64 opacity) override;
	void paintGroupThumbs(QRect outer, float64 opacity) override;
	void paintRoundedCorners(int radius) override;
	void paintStoriesSiblingPart(
		int index,
		const QImage &image,
		QRect rect,
		float64 opacity = 1.) override;

	//void invalidate();

	void paintUsingRaster(
		Ui::GL::Image &image,
		QRect rect,
		Fn<void(Painter&&)> method,
		int bufferOffset,
		bool transparent = false);

	void validateControlsFade();
	void validateControls();
	void invalidateControls();
	void toggleBlending(bool enabled);

	[[nodiscard]] Ui::GL::Rect transformRect(const QRect &raster) const;
	[[nodiscard]] Ui::GL::Rect transformRect(const QRectF &raster) const;
	[[nodiscard]] Ui::GL::Rect transformRect(
		const Ui::GL::Rect &raster) const;
	[[nodiscard]] Ui::GL::Rect scaleRect(
		const Ui::GL::Rect &unscaled,
		float64 scale) const;

	void uploadTexture(
		GLint internalformat,
		GLint format,
		QSize size,
		QSize hasSize,
		int stride,
		const void *data) const;

	const not_null<OverlayWidget*> _owner;

	QOpenGLFunctions *_f = nullptr;
	QSize _viewport;
	float _factor = 1.;
	int _ifactor = 1;
	QVector2D _uniformViewport;

	std::optional<QOpenGLBuffer> _contentBuffer;
	std::optional<QOpenGLShaderProgram> _imageProgram;
	std::optional<QOpenGLShaderProgram> _staticContentProgram;
	QOpenGLShader *_texturedVertexShader = nullptr;
	std::optional<QOpenGLShaderProgram> _withTransparencyProgram;
	std::optional<QOpenGLShaderProgram> _yuv420Program;
	std::optional<QOpenGLShaderProgram> _nv12Program;
	std::optional<QOpenGLShaderProgram> _fillProgram;
	std::optional<QOpenGLShaderProgram> _controlsProgram;
	std::optional<QOpenGLShaderProgram> _roundedCornersProgram;
	Ui::GL::Textures<6> _textures; // image, sibling, right sibling, y, u, v
	QSize _rgbaSize[3];
	QSize _lumaSize;
	QSize _chromaSize;
	qint64 _cacheKeys[3] = { 0 }; // image, sibling, right sibling
	int _trackFrameIndex = 0;
	int _streamedIndex = 0;
	bool _chromaNV12 = false;

	Ui::GL::Image _controlsFadeImage;
	Ui::GL::Image _radialImage;
	Ui::GL::Image _documentBubbleImage;
	Ui::GL::Image _themePreviewImage;
	Ui::GL::Image _saveMsgImage;
	Ui::GL::Image _footerImage;
	Ui::GL::Image _captionImage;
	Ui::GL::Image _groupThumbsImage;
	Ui::GL::Image _controlsImage;

	static constexpr auto kStoriesSiblingPartsCount = 4;
	Ui::GL::Image _storiesSiblingParts[kStoriesSiblingPartsCount];

	static constexpr auto kControlsCount = 6;
	[[nodiscard]] Control controlMeta(Over control) const;

	// Last one is for the over circle image.
	std::array<QRect, kControlsCount + 1> _controlsTextures;

	bool _shadowTopFlip = false;
	bool _shadowsForStories = false;
	bool _blendingEnabled = false;

	rpl::lifetime _storiesLifetime;
	rpl::lifetime _lifetime;

};

} // namespace Media::View