/* (c) Magnus Auvinen. See licence.txt in the root of the distribution for more information. */
/* If you are missing that file, acquire a complete release at teeworlds.com.                */
#ifndef ENGINE_DEMO_H
#define ENGINE_DEMO_H

#include "kernel.h"

#include <base/hash.h>

#include <engine/map.h>
#include <engine/shared/uuid_manager.h>

#include <cstdint>
#include <optional>

enum
{
	MAX_TIMELINE_MARKERS = 64
};

static const unsigned char gs_aHeaderMarker[7] = {'T', 'W', 'D', 'E', 'M', 'O', 0};

static constexpr double DEMO_SPEEDS[] = {0.1, 0.25, 0.5, 0.75, 1.0, 1.25, 1.5, 2.0, 3.0, 4.0, 6.0, 8.0, 12.0, 16.0, 20.0, 24.0, 28.0, 32.0, 40.0, 48.0, 56.0, 64.0};
static constexpr int DEMO_SPEED_INDEX_DEFAULT = 4;
static_assert(DEMO_SPEEDS[DEMO_SPEED_INDEX_DEFAULT] == 1.0);

typedef bool (*DEMOFUNC_FILTER)(const void *pData, int DataSize, void *pUser);

// TODO: Properly extend demo format using uuids
// "6be6da4a-cebd-380c-9b5b-1289c842d780"
// "demoitem-sha256@ddnet.tw"
extern const CUuid SHA256_EXTENSION;

struct CDemoHeader
{
	unsigned char m_aMarker[7];
	unsigned char m_Version;
	char m_aNetversion[64];
	char m_aMapName[64];
	unsigned char m_aMapSize[sizeof(int32_t)];
	unsigned char m_aMapCrc[sizeof(int32_t)];
	char m_aType[8];
	unsigned char m_aLength[sizeof(int32_t)];
	char m_aTimestamp[20];

	bool Valid() const;
};

struct CTimelineMarkers
{
	unsigned char m_aNumTimelineMarkers[sizeof(int32_t)];
	unsigned char m_aTimelineMarkers[MAX_TIMELINE_MARKERS][sizeof(int32_t)];
};

struct CMapInfo
{
	char m_aName[MAX_MAP_LENGTH];
	std::optional<SHA256_DIGEST> m_Sha256;
	unsigned m_Crc;
	unsigned m_Size;
};

class IDemoPlayer : public IInterface
{
	MACRO_INTERFACE("demoplayer")
public:
	class CInfo
	{
	public:
		bool m_Paused;
		bool m_LiveDemo;
		bool m_LivePlayback;
		float m_Speed;

		int m_FirstTick;
		int m_CurrentTick;
		int m_LastTick;

		int m_NumTimelineMarkers;
		int m_aTimelineMarkers[MAX_TIMELINE_MARKERS];
	};

	enum ETickOffset
	{
		TICK_CURRENT, // update the current tick again
		TICK_PREVIOUS, // go to the previous tick
		TICK_NEXT, // go to the next tick
	};

	virtual void SetSpeed(float Speed) = 0;
	virtual void SetSpeedIndex(int SpeedIndex) = 0;
	virtual void AdjustSpeedIndex(int Offset) = 0;
	virtual bool SeekPercent(float Percent) = 0;
	virtual bool SeekTime(float Seconds) = 0;
	virtual bool SeekTick(ETickOffset TickOffset) = 0;
	virtual bool SetPos(int WantedTick) = 0;
	virtual void Pause() = 0;
	virtual void Unpause() = 0;
	virtual const char *ErrorMessage() const = 0;
	virtual bool IsPlaying() const = 0;
	virtual const CInfo *BaseInfo() const = 0;
	virtual void GetDemoName(char *pBuffer, size_t BufferSize) const = 0;
	virtual bool GetDemoInfo(class IStorage *pStorage, class IConsole *pConsole, const char *pFilename, int StorageType, CDemoHeader *pDemoHeader, CTimelineMarkers *pTimelineMarkers, CMapInfo *pMapInfo, IOHANDLE *pFile = nullptr, char *pErrorMessage = nullptr, size_t ErrorMessageSize = 0) const = 0;
};

class IDemoRecorder : public IInterface
{
	MACRO_INTERFACE("demorecorder")
public:
	enum class EStopMode
	{
		KEEP_FILE,
		REMOVE_FILE,
	};

	virtual bool IsRecording() const = 0;
	virtual int Stop(IDemoRecorder::EStopMode Mode, const char *pTargetFilename = "") = 0;
	virtual int Length() const = 0;
	virtual const char *CurrentFilename() const = 0;
};

class IDemoEditor : public IInterface
{
	MACRO_INTERFACE("demoeditor")
public:
	virtual bool Slice(const char *pDemo, const char *pDst, int StartTick, int EndTick, DEMOFUNC_FILTER pfnFilter, void *pUser) = 0;
};

#endif
