#include "camera.hpp"
#include "pose_window.hpp"
#include "screen.hpp"
#include <nanogui/glutil.h>

#include <opencv2/imgproc.hpp>
#include <opencv2/imgcodecs.hpp>

#include <ftl/operators/antialiasing.hpp>

#include "overlay.hpp"

#define LOGURU_REPLACE_GLOG 1
#include <loguru.hpp>

#include <fstream>

#ifdef HAVE_OPENVR
#include "vr.hpp"
#endif

using ftl::rgbd::isValidDepth;
using ftl::gui::GLTexture;
using ftl::gui::PoseWindow;
using ftl::codecs::Channel;
using ftl::codecs::Channels;
using cv::cuda::GpuMat;

// TODO(Nick) MOVE
class StatisticsImage {
private:
	cv::Mat data_;	// CV_32FC3, channels: m, s, f
	cv::Size size_;	// image size
	float n_;		// total number of samples

public:
	explicit StatisticsImage(cv::Size size);
	StatisticsImage(cv::Size size, float max_f);

	/* @brief reset all statistics to 0
	 */
	void reset();

	/* @brief update statistics with new values
	 */
	void update(const cv::Mat &in);
	
	/* @brief variance (depth)
	 */
	void getVariance(cv::Mat &out);

	/* @brief standard deviation (depth)
	 */
	void getStdDev(cv::Mat &out);
	
	/* @brief mean value (depth)
	 */
	void getMean(cv::Mat &out);

	/* @brief percent of samples having valid depth value
	 */
	void getValidRatio(cv::Mat &out);
};

StatisticsImage::StatisticsImage(cv::Size size) :
	StatisticsImage(size, std::numeric_limits<float>::infinity()) {}

StatisticsImage::StatisticsImage(cv::Size size, float max_f) {
	size_ = size;
	n_ = 0.0f;
	data_ = cv::Mat(size, CV_32FC3, cv::Scalar(0.0, 0.0, 0.0));

	// TODO
	if (!std::isinf(max_f)) {
		LOG(WARNING) << "TODO: max_f_ not used. Values calculated for all samples";
	}
}

void StatisticsImage::reset() {
	n_ = 0.0f;
	data_ = cv::Scalar(0.0, 0.0, 0.0);
}

void StatisticsImage::update(const cv::Mat &in) {
	DCHECK(in.type() == CV_32F);
	DCHECK(in.size() == size_);
	
	n_ = n_ + 1.0f;

	// Welford's Method
	for (int row = 0; row < in.rows; row++) {
		float* ptr_data = data_.ptr<float>(row);
		const float* ptr_in = in.ptr<float>(row);

		for (int col = 0; col < in.cols; col++, ptr_in++) {
			float x = *ptr_in;
			float &m = *ptr_data++;
			float &s = *ptr_data++;
			float &f = *ptr_data++;
			float m_prev = m;

			if (!ftl::rgbd::isValidDepth(x)) continue;

			f = f + 1.0f;
			m = m + (x - m) / f;
			s = s + (x - m) * (x - m_prev);
		}
	}
}

void StatisticsImage::getVariance(cv::Mat &out) {
	std::vector<cv::Mat> channels(3);
	cv::split(data_, channels);
	cv::divide(channels[1], channels[2], out);
}

void StatisticsImage::getStdDev(cv::Mat &out) {
	getVariance(out);
	cv::sqrt(out, out);
}

void StatisticsImage::getMean(cv::Mat &out) {
	std::vector<cv::Mat> channels(3);
	cv::split(data_, channels);
	out = channels[0];
}

void StatisticsImage::getValidRatio(cv::Mat &out) {
	std::vector<cv::Mat> channels(3);
	cv::split(data_, channels);
	cv::divide(channels[2], n_, out);
}

static Eigen::Affine3d create_rotation_matrix(float ax, float ay, float az) {
	Eigen::Affine3d rx =
		Eigen::Affine3d(Eigen::AngleAxisd(ax, Eigen::Vector3d(1, 0, 0)));
	Eigen::Affine3d ry =
		Eigen::Affine3d(Eigen::AngleAxisd(ay, Eigen::Vector3d(0, 1, 0)));
	Eigen::Affine3d rz =
		Eigen::Affine3d(Eigen::AngleAxisd(az, Eigen::Vector3d(0, 0, 1)));
	return rz * rx * ry;
}

ftl::gui::Camera::Camera(ftl::gui::Screen *screen, int fsid, int fid, ftl::codecs::Channel c) : screen_(screen), fsid_(fsid), fid_(fid), channel_(c),channels_(0u) {
	eye_ = Eigen::Vector3d(0.0f, 0.0f, 0.0f);
	neye_ = Eigen::Vector4d(0.0f, 0.0f, 0.0f, 0.0f);
	rotmat_.setIdentity();
	//up_ = Eigen::Vector3f(0,1.0f,0);
	lerpSpeed_ = 0.999f;
	sdepth_ = false;
	ftime_ = (float)glfwGetTime();
	pause_ = false;

#ifdef HAVE_OPENVR
	vr_mode_ = false;
#endif

	//channel_ = Channel::Left;

	channels_ += c;
	//channels_ += Channel::Depth;
	width_ = 0;
	height_ = 0;

	// Create pose window...
	//posewin_ = new PoseWindow(screen, src_->getURI());
	//posewin_->setTheme(screen->windowtheme);
	//posewin_->setVisible(false);
	posewin_ = nullptr;
	renderer_ = nullptr;
	post_pipe_ = nullptr;
	record_stream_ = nullptr;

	/*src->setCallback([this](int64_t ts, ftl::rgbd::Frame &frame) {
		UNIQUE_LOCK(mutex_, lk);

		auto &channel1 = frame.get<GpuMat>(Channel::Colour);
		im1_.create(channel1.size(), channel1.type());
		channel1.download(im1_);

		// OpenGL (0,0) bottom left
		cv::flip(im1_, im1_, 0);

		if (channel_ != Channel::Colour && channel_ != Channel::None && frame.hasChannel(channel_)) {
			auto &channel2 = frame.get<GpuMat>(channel_);
			im2_.create(channel2.size(), channel2.type());
			channel2.download(im2_);
			cv::flip(im2_, im2_, 0);
		}
	});*/

	auto *host = screen->root();

	// Is virtual camera?
	if (fid == 255) {
		state_.getLeft().width = host->value("width", 1280);
		state_.getLeft().height = host->value("height", 720);
		state_.getLeft().fx = host->value("focal", 700.0f);
		state_.getLeft().fy = state_.getLeft().fx;
		state_.getLeft().cx = -(double)state_.getLeft().width / 2.0;
		state_.getLeft().cy = -(double)state_.getLeft().height / 2.0;
		state_.getLeft().minDepth = host->value("minDepth", 0.1f);
		state_.getLeft().maxDepth = host->value("maxDepth", 15.0f);
		state_.getLeft().doffs = 0;
		state_.getLeft().baseline = host->value("baseline", 0.05f);

		state_.getRight().width = host->value("width", 1280);
		state_.getRight().height = host->value("height", 720);
		state_.getRight().fx = host->value("focal_right", 700.0f);
		state_.getRight().fy = state_.getRight().fx;
		state_.getRight().cx = host->value("centre_x_right", -(double)state_.getLeft().width / 2.0);
		state_.getRight().cy = host->value("centre_y_right", -(double)state_.getLeft().height / 2.0);
		state_.getRight().minDepth = host->value("minDepth", 0.1f);
		state_.getRight().maxDepth = host->value("maxDepth", 15.0f);
		state_.getRight().doffs = 0;
		state_.getRight().baseline = host->value("baseline", 0.05f);

		Eigen::Matrix4d pose;
		pose.setIdentity();
		state_.setPose(pose);
	}
}

ftl::gui::Camera::~Camera() {
	//delete writer_;
	//delete fileout_;
}

void ftl::gui::Camera::draw(std::vector<ftl::rgbd::FrameSet*> &fss) {
	if (fid_ != 255) return;
	if (fsid_ >= fss.size()) return;

	auto &fs = *fss[fsid_];
	
	UNIQUE_LOCK(fs.mtx,lk);
	UNIQUE_LOCK(mutex_, lk2);
	_draw(fs);
}

void ftl::gui::Camera::_draw(ftl::rgbd::FrameSet &fs) {
	frame_.reset();
	frame_.setOrigin(&state_);
	if (!renderer_) renderer_ = ftl::create<ftl::render::Triangular>(screen_->root(), "vcam1");
	Eigen::Matrix4d t;
	t.setIdentity();
	renderer_->render(fs, frame_, channel_, t);

	// TODO: Insert post-render pipeline.
	// FXAA + Bad colour removal

	if (!post_pipe_) {
		post_pipe_ = ftl::config::create<ftl::operators::Graph>(screen_->root(), "post_filters");
		post_pipe_->append<ftl::operators::FXAA>("fxaa");
	}

	post_pipe_->apply(frame_, frame_, 0);

	_downloadFrames(&frame_);

	if (screen_->root()->value("show_poses", false)) {
		cv::Mat over_col, over_depth;
		over_col.create(im1_.size(), CV_8UC4);
		over_depth.create(im1_.size(), CV_32F);

		for (int i=0; i<fs.frames.size(); ++i) {
			auto pose = fs.frames[i].getPose().inverse() * state_.getPose();
			Eigen::Vector4d pos = pose.inverse() * Eigen::Vector4d(0,0,0,1);
			pos /= pos[3];

			auto name = fs.frames[i].get<std::string>("name");
			ftl::overlay::drawCamera(state_.getLeft(), im1_, over_depth, fs.frames[i].getLeftCamera(), pose, cv::Scalar(0,0,255,255), 0.2);
			if (name) ftl::overlay::drawText(state_.getLeft(), im1_, over_depth, *name, pos, 0.5, cv::Scalar(0,0,255,255));
		}
	}

	if (record_stream_ && record_stream_->active()) {
		// TODO: Allow custom channel selection
		ftl::rgbd::FrameSet fs2;
		auto &f = fs2.frames.emplace_back();
		fs2.count = 1;
		fs2.mask = 1;
		fs2.stale = false;
		frame_.swapTo(Channels<0>(Channel::Colour), f);  // Channel::Colour + Channel::Depth
		fs2.timestamp = fs.timestamp;
		fs2.id = 0;
		record_sender_->post(fs2);
		record_stream_->select(0, Channels<0>(Channel::Colour));
		f.swapTo(Channels<0>(Channel::Colour), frame_);
	}
}

void ftl::gui::Camera::_downloadFrames(ftl::rgbd::Frame *frame) {
	if (!frame) return;

	auto &channel1 = frame->get<GpuMat>(Channel::Colour);
	im1_.create(channel1.size(), channel1.type());
	channel1.download(im1_);

	// OpenGL (0,0) bottom left
	cv::flip(im1_, im1_, 0);

	width_ = im1_.cols;
	height_ = im1_.rows;

	if (channel_ != Channel::Colour && channel_ != Channel::None && frame->hasChannel(channel_)) {
		auto &channel2 = frame->get<GpuMat>(channel_);
		im2_.create(channel2.size(), channel2.type());
		channel2.download(im2_);
		//LOG(INFO) << "Have channel2: " << im2_.type() << ", " << im2_.size();
		cv::flip(im2_, im2_, 0);
	}
}

void ftl::gui::Camera::update(std::vector<ftl::rgbd::FrameSet*> &fss) {
	UNIQUE_LOCK(mutex_, lk);

	if (fss.size() <= fsid_) return;
	auto &fs = *fss[fsid_];

	ftl::rgbd::Frame *frame = nullptr;

	if (fid_ == 255) {
		name_ = "Virtual Camera";
		// Do a draw if not active. If active the draw function will be called
		// directly.
		if (screen_->activeCamera() != this) {
			_draw(fs);
		}
	} else {
		if (fid_ >= fs.frames.size()) return;
		frame = &fs.frames[fid_];
		_downloadFrames(frame);
		auto n = frame->get<std::string>("name");
		if (n) {
			name_ = *n;
		} else {
			name_ = "No name";
		}
	}
}

void ftl::gui::Camera::setPose(const Eigen::Matrix4d &p) {
	eye_[0] = p(0,3);
	eye_[1] = p(1,3);
	eye_[2] = p(2,3);

	double sx = Eigen::Vector3d(p(0,0), p(1,0), p(2,0)).norm();
	double sy = Eigen::Vector3d(p(0,1), p(1,1), p(2,1)).norm();
	double sz = Eigen::Vector3d(p(0,2), p(1,2), p(2,2)).norm();

	Eigen::Matrix4d rot = p;
	rot(0,3) = 0.0;
	rot(1,3) = 0.0;
	rot(2,3) = 0.0;
	rot(0,0) = rot(0,0) / sx;
	rot(1,0) = rot(1,0) / sx;
	rot(2,0) = rot(2,0) / sx;
	rot(0,1) = rot(0,1) / sy;
	rot(1,1) = rot(1,1) / sy;
	rot(2,1) = rot(2,1) / sy;
	rot(0,2) = rot(0,2) / sz;
	rot(1,2) = rot(1,2) / sz;
	rot(2,2) = rot(2,2) / sz;
	rotmat_ = rot;
}

void ftl::gui::Camera::mouseMovement(int rx, int ry, int button) {
	//if (!src_->hasCapabilities(ftl::rgbd::kCapMovable)) return;
	if (fid_ < 255) return;
	if (button == 1) {
		float rrx = ((float)ry * 0.2f * delta_);
		//orientation_[2] += std::cos(orientation_[1])*((float)rel[1] * 0.2f * delta_);
		float rry = (float)rx * 0.2f * delta_;
		float rrz = 0.0;


		Eigen::Affine3d r = create_rotation_matrix(rrx, -rry, rrz);
		rotmat_ = rotmat_ * r.matrix();
	}
}

void ftl::gui::Camera::keyMovement(int key, int modifiers) {
	//if (!src_->hasCapabilities(ftl::rgbd::kCapMovable)) return;
	if (fid_ < 255) return;
	if (key == 263 || key == 262) {
		float mag = (modifiers & 0x1) ? 0.01f : 0.1f;
		float scalar = (key == 263) ? -mag : mag;
		neye_ += rotmat_*Eigen::Vector4d(scalar,0.0,0.0,1.0);
		return;
	} else if (key == 264 || key == 265) {
		float mag = (modifiers & 0x1) ? 0.01f : 0.1f;
		float scalar = (key == 264) ? -mag : mag;
		neye_ += rotmat_*Eigen::Vector4d(0.0,0.0,scalar,1.0);
		return;
	} else if (key == 266 || key == 267) {
		float mag = (modifiers & 0x1) ? 0.01f : 0.1f;
		float scalar = (key == 266) ? -mag : mag;
		neye_ += rotmat_*Eigen::Vector4d(0.0,scalar,0.0,1.0);
		return;
	}
}

void ftl::gui::Camera::showPoseWindow() {
	posewin_->setVisible(true);
}

void ftl::gui::Camera::showSettings() {

}

#ifdef HAVE_OPENVR
bool ftl::gui::Camera::setVR(bool on) {
	
	if (on == vr_mode_) {
		LOG(WARNING) << "VR mode already enabled";
		return on;
	}
	vr_mode_ = on;

	if (on) {
		setChannel(Channel::Right);
		//src_->set("baseline", baseline_);
		state_.getLeft().baseline = baseline_;

		Eigen::Matrix3d intrinsic;
		
		intrinsic = getCameraMatrix(screen_->getVR(), vr::Eye_Left);
		CHECK(intrinsic(0, 2) < 0 && intrinsic(1, 2) < 0);
		//src_->set("focal", intrinsic(0, 0));
		//src_->set("centre_x", intrinsic(0, 2));
		//src_->set("centre_y", intrinsic(1, 2));
		state_.getLeft().fx = intrinsic(0,0);
		state_.getLeft().fy = intrinsic(0,0);
		state_.getLeft().cx = intrinsic(0,2);
		state_.getLeft().cy = intrinsic(1,2);
		
		intrinsic = getCameraMatrix(screen_->getVR(), vr::Eye_Right);
		CHECK(intrinsic(0, 2) < 0 && intrinsic(1, 2) < 0);
		//src_->set("focal_right", intrinsic(0, 0));
		//src_->set("centre_x_right", intrinsic(0, 2));
		//src_->set("centre_y_right", intrinsic(1, 2));
		state_.getRight().fx = intrinsic(0,0);
		state_.getRight().fy = intrinsic(0,0);
		state_.getRight().cx = intrinsic(0,2);
		state_.getRight().cy = intrinsic(1,2);

		vr_mode_ = true;
	}
	else {
		vr_mode_ = false;
		setChannel(Channel::Left); // reset to left channel
		// todo restore camera params<
	}

	return vr_mode_;
}
#endif

void ftl::gui::Camera::setChannel(Channel c) {
#ifdef HAVE_OPENVR
	if (isVR() && (c != Channel::Right)) {
		LOG(ERROR) << "Changing channel in VR mode is not possible.";
		return;
	}
#endif

	channel_ = c;
}

static void visualizeDepthMap(	const cv::Mat &depth, cv::Mat &out,
								const float max_depth)
{
	DCHECK(max_depth > 0.0);

	depth.convertTo(out, CV_8U, 255.0f / max_depth);
	out = 255 - out;
	cv::Mat mask = (depth >= 39.0f); // TODO (mask for invalid pixels)
	
	applyColorMap(out, out, cv::COLORMAP_JET);
	out.setTo(cv::Scalar(255, 255, 255), mask);
	cv::cvtColor(out,out, cv::COLOR_BGR2BGRA);
}

static void visualizeEnergy(	const cv::Mat &depth, cv::Mat &out,
								const float max_depth)
{
	DCHECK(max_depth > 0.0);

	depth.convertTo(out, CV_8U, 255.0f / max_depth);
	//out = 255 - out;
	//cv::Mat mask = (depth >= 39.0f); // TODO (mask for invalid pixels)
	
	applyColorMap(out, out, cv::COLORMAP_JET);
	//out.setTo(cv::Scalar(255, 255, 255), mask);
	cv::cvtColor(out,out, cv::COLOR_BGR2BGRA);
}

static void drawEdges(	const cv::Mat &in, cv::Mat &out,
						const int ksize = 3, double weight = -1.0, const int threshold = 32,
						const int threshold_type = cv::THRESH_TOZERO)
{
	cv::Mat edges;
	cv::Laplacian(in, edges, 8, ksize);
	cv::threshold(edges, edges, threshold, 255, threshold_type);

	cv::Mat edges_color(in.size(), CV_8UC4);
	cv::addWeighted(edges, weight, out, 1.0, 0.0, out, CV_8UC4);
}

cv::Mat ftl::gui::Camera::visualizeActiveChannel() {
	cv::Mat result;
	switch(channel_) {
		case Channel::Smoothing:
		case Channel::Confidence:
			visualizeEnergy(im2_, result, 1.0);
			break;
		case Channel::Density:
		case Channel::Energy:
			visualizeEnergy(im2_, result, 10.0);
			break;
		case Channel::Depth:
			visualizeDepthMap(im2_, result, 7.0);
			if (screen_->root()->value("showEdgesInDepth", false)) drawEdges(im1_, result);
			break;
		case Channel::Right:
			result = im2_;
	}
	return result;
}

bool ftl::gui::Camera::thumbnail(cv::Mat &thumb) {
	UNIQUE_LOCK(mutex_, lk);
	/*src_->grab(1,9);*/
	cv::Mat sel = (channel_ != Channel::None && channel_ != Channel::Colour && !im2_.empty()) ? visualizeActiveChannel() : im1_;
	if (sel.empty()) return false;
	cv::resize(sel, thumb, cv::Size(320,180));
	cv::flip(thumb, thumb, 0);
	return true;
}

const GLTexture &ftl::gui::Camera::captureFrame() {
	float now = (float)glfwGetTime();
	delta_ = now - ftime_;
	ftime_ = now;

	//if (src_ && src_->isReady()) {
	if (width_ > 0 && height_ > 0) {
		UNIQUE_LOCK(mutex_, lk);

		if (screen_->isVR()) {
			#ifdef HAVE_OPENVR
			
			vr::VRCompositor()->WaitGetPoses(rTrackedDevicePose_, vr::k_unMaxTrackedDeviceCount, NULL, 0 );

			if ((channel_ == Channel::Right) && rTrackedDevicePose_[vr::k_unTrackedDeviceIndex_Hmd].bPoseIsValid )
			{
				Eigen::Matrix4d eye_l = ConvertSteamVRMatrixToMatrix4(
					vr::VRSystem()->GetEyeToHeadTransform(vr::Eye_Left));
				
				Eigen::Matrix4d eye_r = ConvertSteamVRMatrixToMatrix4(
					vr::VRSystem()->GetEyeToHeadTransform(vr::Eye_Left));

				float baseline_in = 2.0 * eye_l(0, 3);
				
				if (baseline_in != baseline_) {
					baseline_ = baseline_in;
					//src_->set("baseline", baseline_);
					state_.getLeft().baseline = baseline_;
				}
				Eigen::Matrix4d pose = ConvertSteamVRMatrixToMatrix4(rTrackedDevicePose_[vr::k_unTrackedDeviceIndex_Hmd].mDeviceToAbsoluteTracking);
				Eigen::Vector3d ea = pose.block<3, 3>(0, 0).eulerAngles(0, 1, 2);
				
				// NOTE: If modified, should be verified with VR headset!
				Eigen::Matrix3d R;
				R =		Eigen::AngleAxisd(ea[0], Eigen::Vector3d::UnitX()) *
						Eigen::AngleAxisd(-ea[1], Eigen::Vector3d::UnitY()) *
						Eigen::AngleAxisd(-ea[2], Eigen::Vector3d::UnitZ()); 
				
				//double rd = 180.0 / 3.141592;
				//LOG(INFO) << "rotation x: " << ea[0] *rd << ", y: " << ea[1] * rd << ", z: " << ea[2] * rd;
				// pose.block<3, 3>(0, 0) = R;
				
				rotmat_.block(0, 0, 3, 3) = R;
			
			} else {
				//LOG(ERROR) << "No VR Pose";
			}
			#endif
		}

		eye_[0] += (neye_[0] - eye_[0]) * lerpSpeed_ * delta_;
		eye_[1] += (neye_[1] - eye_[1]) * lerpSpeed_ * delta_;
		eye_[2] += (neye_[2] - eye_[2]) * lerpSpeed_ * delta_;

		Eigen::Translation3d trans(eye_);
		Eigen::Affine3d t(trans);
		Eigen::Matrix4d viewPose = t.matrix() * rotmat_;

		if (isVirtual()) state_.setPose(viewPose);
	
		//src_->grab();

		// When switching from right to depth, client may still receive
		// right images from previous batch (depth.channels() == 1 check)

		/* todo: does not work
		if (channel_ == Channel::Deviation &&
			depth_.rows > 0 && depth_.channels() == 1)
		{
			if (!stats_) {
				stats_ = new StatisticsImage(depth_.size());
			}
			
			stats_->update(depth_);
		}*/

		cv::Mat tmp;

		switch(channel_) {
			case Channel::Smoothing:
			case Channel::Confidence:
				if (im2_.rows == 0) { break; }
				visualizeEnergy(im2_, tmp, screen_->root()->value("float_image_max", 1.0f));
				texture2_.update(tmp);
				break;
			
			case Channel::Density:
			case Channel::Energy:
				if (im2_.rows == 0) { break; }
				visualizeEnergy(im2_, tmp, 10.0);
				texture2_.update(tmp);
				break;
			
			case Channel::Depth:
				if (im2_.rows == 0 || im2_.type() != CV_32F) { break; }
				visualizeDepthMap(im2_, tmp, 7.0);
				if (screen_->root()->value("showEdgesInDepth", false)) drawEdges(im1_, tmp);
				texture2_.update(tmp);
				break;
			
			case Channel::Deviation:
				if (im2_.rows == 0) { break; }/*
				//imageSize = Vector2f(depth.cols, depth.rows);
				stats_->getStdDev(tmp);
				tmp.convertTo(tmp, CV_8U, 1000.0);
				applyColorMap(tmp, tmp, cv::COLORMAP_HOT);
				texture2_.update(tmp);*/
				break;

			//case Channel::Flow:
			case Channel::ColourNormals:
			case Channel::Right:
					if (im2_.rows == 0 || im2_.type() != CV_8UC4) { break; }
					texture2_.update(im2_);
					break;

			default:
				break;
				/*if (rgb_.rows == 0) { break; }
				//imageSize = Vector2f(rgb.cols,rgb.rows);
				texture_.update(rgb_);
				#ifdef HAVE_OPENVR
				if (screen_->hasVR() && depth_.channels() >= 3) {
					LOG(INFO) << "DRAW RIGHT";
					textureRight_.update(depth_);
				}
				#endif
				*/
		}

		if (im1_.rows != 0) {
			//imageSize = Vector2f(rgb.cols,rgb.rows);
			texture1_.update(im1_);
		}
	}

	return texture1_;
}

void ftl::gui::Camera::snapshot(const std::string &filename) {
	UNIQUE_LOCK(mutex_, lk);
	cv::Mat blended;
	cv::Mat visualized = visualizeActiveChannel();

	if (!visualized.empty()) {
		double alpha = screen_->root()->value("blending", 0.5);
		cv::addWeighted(im1_, alpha, visualized, 1.0-alpha, 0, blended);
	} else {
		blended = im1_;
	}
	cv::Mat flipped;
	cv::flip(blended, flipped, 0);
	cv::cvtColor(flipped, flipped, cv::COLOR_BGRA2BGR);
	cv::imwrite(filename, flipped);
}

void ftl::gui::Camera::startVideoRecording(const std::string &filename) {
	if (!record_stream_) {
		record_stream_ = ftl::create<ftl::stream::File>(screen_->root(), "video2d");
		record_stream_->setMode(ftl::stream::File::Mode::Write);
		record_sender_ = ftl::create<ftl::stream::Sender>(screen_->root(), "videoEncode");
		record_sender_->setStream(record_stream_);
	}

	if (record_stream_->active()) return;

	record_stream_->set("filename", filename);
	record_stream_->begin();
}

void ftl::gui::Camera::stopVideoRecording() {
	if (record_stream_ && record_stream_->active()) record_stream_->end();
}