#pragma once

#include "VideoIOTypes.h"

#include <memory>
#include <string>

class HealthTelemetry;
class OpenGLVideoIOBridge;
class RenderEngine;
class VideoIODevice;

class VideoBackend
{
public:
	VideoBackend(RenderEngine& renderEngine, HealthTelemetry& healthTelemetry);
	~VideoBackend();

	void ReleaseResources();
	bool DiscoverDevicesAndModes(const VideoFormatSelection& videoModes, std::string& error);
	bool SelectPreferredFormats(const VideoFormatSelection& videoModes, bool outputAlphaRequired, std::string& error);
	bool ConfigureInput(const VideoFormat& inputVideoMode, std::string& error);
	bool ConfigureOutput(const VideoFormat& outputVideoMode, bool externalKeyingEnabled, std::string& error);
	bool Start();
	bool Stop();

	const VideoIOState& State() const;
	VideoIOState& MutableState();
	bool BeginOutputFrame(VideoIOOutputFrame& frame);
	void EndOutputFrame(VideoIOOutputFrame& frame);
	bool ScheduleOutputFrame(const VideoIOOutputFrame& frame);
	void AccountForCompletionResult(VideoIOCompletionResult result);

	bool HasInputDevice() const;
	bool HasInputSource() const;
	unsigned InputFrameWidth() const;
	unsigned InputFrameHeight() const;
	unsigned OutputFrameWidth() const;
	unsigned OutputFrameHeight() const;
	unsigned CaptureTextureWidth() const;
	unsigned OutputPackTextureWidth() const;
	VideoIOPixelFormat InputPixelFormat() const;
	const std::string& InputDisplayModeName() const;
	const std::string& OutputModelName() const;
	bool SupportsInternalKeying() const;
	bool SupportsExternalKeying() const;
	bool KeyerInterfaceAvailable() const;
	bool ExternalKeyingActive() const;
	const std::string& StatusMessage() const;
	void SetStatusMessage(const std::string& message);

private:
	std::unique_ptr<VideoIODevice> mVideoIODevice;
	std::unique_ptr<OpenGLVideoIOBridge> mBridge;
};