#pragma once

#include <EGL/egl.h>

#include <cstdint>
#include <mutex>
#include <thread>
#include <vector>

#include <QImage>
#include <QHash>
#include <QList>
#include <QElapsedTimer>
#include <QRectF>
#include <QSize>
#include <QString>
#include <QStringList>
#include <QVariantMap>
#include <QVector>
#include <QtQml/qqml.h>
#include <qtmetamacros.h>
#include <atomic>
#include <memory>

#include "videodecoder.hpp"
#include "wallpapercache.hpp"
#include "videotranscoder.hpp"

#include <qwayland-wlr-layer-shell-unstable-v1.h>
#include <wayland-client-protocol.h>

#include "wallpapersurface.hpp"
#include "config/enums.hpp"

struct mpv_handle;
struct mpv_render_context;

class QProcess;

namespace ZShell::wallpaper {

class WallpaperSurface;

class WallpaperService : public QObject {
	Q_OBJECT
	QML_ELEMENT

	Q_PROPERTY(QString path READ path WRITE setPath NOTIFY pathChanged REQUIRED)
	Q_PROPERTY(QVariantMap crops READ crops WRITE setCrops NOTIFY cropsChanged)
	Q_PROPERTY(QString dbPath READ dbPath WRITE setDbPath NOTIFY dbPathChanged)
	Q_PROPERTY(
		QSize largestBufferSize READ largestBufferSize NOTIFY
			largestBufferSizeChanged)

	public:
	explicit WallpaperService(QObject* parent = nullptr);
	~WallpaperService() override;

	[[nodiscard]] QString path() const;
	void setPath(const QString& path);

	[[nodiscard]] QSize largestBufferSize() const;

	[[nodiscard]] QString dbPath() const;
	void setDbPath(const QString& path);

	void addScreen(const QString& screen);
	void removeScreen(const QString& screen);

	[[nodiscard]] const QVariantMap& crops() const;
	void setCrops(const QVariantMap& crops);

	Q_INVOKABLE void redraw();

	Q_INVOKABLE void setCrop(const QString& screen, const QVariantMap& crop);

	Q_INVOKABLE void invalidateCache();

	signals:
	void pathChanged();
	void cropsChanged();
	void dbPathChanged();
	void largestBufferSizeChanged();

	private:
	friend class WallpaperSurface;

	static bool isVideoPath(const QString& path);

	void applyPath(const QString& path);

	void startVideo(const QString& path);
	void teardownMpv();

	void initMpvRender();
	void renderMpvToSurface(const QSize& size);
	void pumpMpvEvents();

	static void* getMpvProcAddress(void* ctx, const char* name);
	static void mpvUpdate(void* ctx);

#ifdef ZHAVE_FFMPEG
	bool startDecoderVideo(const QString& path);
	void stopDecoderVideo();
	[[nodiscard]] uint32_t createVideoProgram();
	void drawVideoTexture(
		uint32_t lumaTex,
		uint32_t chromaTex,
		int matrix,
		int range,
		const QRectF& rect,
		float sizeW,
		float sizeH,
		float srcW,
		float srcH,
		float alpha);
#endif

	void bindGlobals();
	static void registryGlobal(
		void* data,
		struct wl_registry* registry,
		uint32_t name,
		const char* interface,
		uint32_t version);

	void storeGlobal(const char* interface, void* proxy);

	struct TransProgram {
		uint32_t id = 0;
		int size = -1;
		int progress = -1;
		int from = -1;
		int to = -1;
		int fromCrop = -1;
		int toCrop = -1;
		int fromFlip = -1;
		int toFlip = -1;
	};

	[[nodiscard]] bool setupGl();
	[[nodiscard]] uint32_t createProgram();
	[[nodiscard]] TransProgram createTransitionProgram(const QString& file);
	[[nodiscard]] TransProgram programFor(const QString& file);
	bool ensureTransitionProgram();
	QString transitionFileFor(ZShell::config::WallpaperTransition::Enum value);
	[[nodiscard]] QString randomTransitionFile();

	void ensureCapture(const QSize& size);
	uint32_t renderVideoIntoTexture(const QSize& size);

	void drawSurfaceTransition(WallpaperSurface* surface);

	struct TransitionLayer {
		uint32_t tex = 0;
		QImage image;
		QVariantMap crops;
		QString transitionFile;
		bool isVideo = false;
		bool ready = false;
		bool started = false;
		QElapsedTimer timer;
		qreal progress = 0.0;
	};

	void ensureBaseFbo();
	void ensureAccum(const QSize& size);
	void bindRtt(uint32_t fbo, uint32_t tex, const QSize& size);
	void drawTransitionPair(
		const TransProgram& program,
		uint32_t fromTex,
		float fromFlip,
		const QRectF& fromCrop,
		uint32_t toTex,
		float toFlip,
		const QRectF& toCrop,
		qreal progress,
		const QSize& size);
	uint32_t targetTexFor(const TransitionLayer& layer, int index) const;
	QRectF cropForLayer(
		const TransitionLayer& layer,
		const QString& screen,
		const QSize& size) const;
	void captureBase(
		const QSize& size,
		const QString& screen,
		uint32_t oldTex,
		float oldFlip,
		const QRectF& oldCrop);
	void renderComposite(
		const QSize& size,
		const QString& screen,
		uint32_t outFbo,
		uint32_t outTex,
		int first,
		int last,
		uint32_t videoTex,
		uint32_t posterTex);

	void uploadTexture(uint32_t& texture, const QImage& image);
	void uploadImage();
	void createBlackTexture(uint32_t& texture);

	void drawTexture(
		uint32_t texture,
		const QRectF& rect,
		float sizeW,
		float sizeH,
		float alpha);

	void ensureImage();

	void ensurePoster();

	void notifyBufferSizes();

	void queue(WallpaperSurface* surface);
	void queueAll();

	void loop();

	void present();

	void drawSurface(WallpaperSurface* surface);

	void wake();

	[[nodiscard]] wl_event_queue* eventQueue() const { return m_queue; }

	[[nodiscard]] QRectF sourceRect(
		const QVariantMap& crops,
		const QString& screen,
		const QSize& size,
		const QSize& image) const;

	void start();

	void addSurfaces();
	void addSurface(const QString& screen);

	QString m_path;
	QString m_dbPath;
	QStringList m_screens;
	QVariantMap m_crops;

	WallpaperCache m_cache;

	QImage m_image;

	bool m_isVideo = false;
	bool m_videoReload = false;
	mpv_handle* m_mpv = nullptr;
	mpv_render_context* m_mpvRender = nullptr;
	uint32_t m_blackTex = 0;
	std::atomic<bool> m_mpvFrameReady{false};
	std::atomic<bool> m_videoReady{false};
	std::atomic<bool> m_videoLoaded{false};

	VideoTranscoder* m_transcoder = nullptr;

	QSize m_decodeSize;

	QImage m_stagedImage;
	QString m_stagedPath;
	bool m_stagedReady = false;
	bool m_decoding = false;
	QString m_decodePath;
	bool m_replacementReady = false;

	wl_display* m_display = nullptr;
	wl_registry* m_registry = nullptr;
	wl_compositor* m_compositor = nullptr;
	QtWayland::zwlr_layer_shell_v1* m_layerShell = nullptr;
	QtWayland::wp_viewporter* m_viewporter = nullptr;
	QtWayland::wp_fractional_scale_manager_v1* m_scaleManager = nullptr;

	EGLDisplay m_eglDisplay = EGL_NO_DISPLAY;
	EGLConfig m_config = nullptr;
	EGLContext m_context = EGL_NO_CONTEXT;
	uint32_t m_texture = 0;
	uint32_t m_program = 0;
	int m_sizeUniform = -1;
	int m_cropUniform = -1;
	int m_alphaUniform = -1;
	int m_sourceUniform = -1;

	bool m_randomTransition = false;
	QString m_transitionFile;
	bool m_transitionDirty = false;
	QHash<QString, TransProgram> m_transPrograms;
	TransProgram m_neutralProgram;
	QVector<int> m_transitionUses;
	QString m_lastTransition;

	uint32_t m_captureFbo = 0;
	uint32_t m_captureTex = 0;
	QSize m_captureSize;

	uint32_t m_baseFbo = 0;
	uint32_t m_baseTex = 0;
	QSize m_baseSize;
	bool m_baseReady = false;

	uint32_t m_accumFbo = 0;
	uint32_t m_accumA = 0;
	uint32_t m_accumB = 0;
	QSize m_accumSize;

	std::vector<TransitionLayer> m_transitions;

	bool m_needCaptureBase = false;
	QImage m_baseImage;
	QVariantMap m_baseCrops;
	bool m_baseIsVideo = false;
	bool m_baseIsBlack = false;
	bool m_collapseVideo = false;
	bool m_promoteOldest = false;
	bool m_newestDone = false;

	static constexpr int kMaxTransitions = 4;

	uint32_t m_videoProgram = 0;
	uint32_t m_vao = 0;
	int m_videoSizeUniform = -1;
	int m_videoSrcSizeUniform = -1;
	int m_videoCropUniform = -1;
	int m_videoAlphaUniform = -1;
	int m_videoLumaUniform = -1;
	int m_videoChromaUniform = -1;
	int m_videoMatrixUniform = -1;
	int m_videoRangeUniform = -1;
	int m_videoChromaOffUniform = -1;

#ifdef ZHAVE_FFMPEG
	std::unique_ptr<VideoDecoder> m_decoder;
	bool m_useDecoder = true;
#endif

	std::vector<uint32_t> m_orphanTextures;

	bool m_programsCompiled = false;

	QList<WallpaperSurface*> m_surfaces;

	std::thread m_thread;
	mutable std::recursive_mutex m_mutex;
	wl_event_queue* m_queue = nullptr;

	int m_wake[2] = {-1, -1};

	bool m_stop = false;
	bool m_drawing = false;

	bool started = false;

	bool m_forceDecode = false;
	bool m_imageChanged = false;

	QImage m_posterImage;
	uint32_t m_posterTex = 0;
	QString m_posterPath;
	bool m_posterReady = false;
	bool m_posterLoading = false;
	bool m_posterChanged = false;
};

} // namespace ZShell::wallpaper