/* SPDX-License-Identifier: MIT */
/**
	@file		info.h
	@brief		Declares the AJASystemInfo class.
	@copyright	(C) 2009-2021 AJA Video Systems, Inc.  All rights reserved.
**/

#ifndef AJA_INFO_H
#define AJA_INFO_H

#include "ajabase/common/public.h"
#include <vector>
#include <map>
#include <string>

// forward declarations
class AJASystemInfoImpl;

enum AJASystemInfoMemoryUnit
{
	AJA_SystemInfoMemoryUnit_Bytes,
	AJA_SystemInfoMemoryUnit_Kilobytes,
	AJA_SystemInfoMemoryUnit_Megabytes,
	AJA_SystemInfoMemoryUnit_Gigabytes,

	AJA_SystemInfoMemoryUnit_LAST
};

enum AJASystemInfoTag
{
	AJA_SystemInfoTag_System_Model,
	AJA_SystemInfoTag_System_Bios,
	AJA_SystemInfoTag_System_Name,
	AJA_SystemInfoTag_System_BootTime,
	AJA_SystemInfoTag_OS_ProductName,
	AJA_SystemInfoTag_OS_Version,
	AJA_SystemInfoTag_OS_VersionBuild,
	AJA_SystemInfoTag_OS_KernelVersion,
	AJA_SystemInfoTag_CPU_Type,
	AJA_SystemInfoTag_CPU_NumCores,
	AJA_SystemInfoTag_Mem_Total,
	AJA_SystemInfoTag_Mem_Used,
	AJA_SystemInfoTag_Mem_Free,
	AJA_SystemInfoTag_GPU_Type,
	AJA_SystemInfoTag_Path_UserHome,
	AJA_SystemInfoTag_Path_PersistenceStoreUser,
	AJA_SystemInfoTag_Path_PersistenceStoreSystem,
	AJA_SystemInfoTag_Path_Applications,
	AJA_SystemInfoTag_Path_Utilities,
	AJA_SystemInfoTag_Path_Firmware,

	AJA_SystemInfoTag_LAST
};

enum AJASystemInfoSections
{
	AJA_SystemInfoSection_CPU	 = 0x00000001 << 0,
	AJA_SystemInfoSection_GPU	 = 0x00000001 << 1,
	AJA_SystemInfoSection_Mem	 = 0x00000001 << 2,
	AJA_SystemInfoSection_OS	 = 0x00000001 << 3,
	AJA_SystemInfoSection_Path	 = 0x00000001 << 4,
	AJA_SystemInfoSection_System = 0x00000001 << 5,

	AJA_SystemInfoSection_None	 = 0x00000000,
	AJA_SystemInfoSection_All	 = 0xFFFFFFFF
};

typedef std::pair<std::string, std::string>		AJALabelValuePair;				///< @brief A pair of strings comprising a label and a value
typedef std::vector<AJALabelValuePair>			AJALabelValuePairs;				///< @brief An ordered sequence of label/value pairs
typedef AJALabelValuePairs::const_iterator		AJALabelValuePairsConstIter;

/**
 *	Class for getting common information about the system.
 *	@ingroup AJAGroupSystem
 *
 *
 */
class AJA_EXPORT AJASystemInfo
{
public: //	Instance Methods
	/**
	 *	@brief		 Default constructor that instantiates the platform-specific implementation,
	 *				 then calls Rescan.
	 *	@param[in]	 inUnits	 Optionally specifies the AJASystemInfoMemoryUnit to use.
	 *							 Defaults to "megabytes".
	 *	@param[in]	 sections	 The sections of the info structure to rescan, bitwise OR the desired sections
	 *							 or use AJA_SystemInfoSection_All (the default) for all sections or
	 *							 AJA_SystemInfoSection_None for no sections. In the case of AJA_SystemInfoSection_None
	 *							 only the labels are set, no scanning is done at initialization.
	 */
	AJASystemInfo (const AJASystemInfoMemoryUnit inUnits = AJA_SystemInfoMemoryUnit_Megabytes,
				   AJASystemInfoSections sections = AJA_SystemInfoSection_All);

	virtual ~AJASystemInfo();

	/**
	 *	Rescans the host system.
	 *	@param[in]	 sections	 The sections of the info structure to rescan, bitwise OR the desired sections
	 *							 or use AJA_SystemInfoSection_All (the default) for all sections or
	 *							 AJA_SystemInfoSection_None for no sections. In the case of AJA_SystemInfoSection_None
	 *							 only the labels are set, no scanning is done.
	 */
	virtual AJAStatus Rescan (AJASystemInfoSections sections = AJA_SystemInfoSection_All);
	
	/**
	 *	@brief		 Answers with the host system info value string for the given AJASystemInfoTag.
	 *	@param[in]	 inTag		The AJASystemInfoTag of interest
	 *	@param[out]	 outValue	Receives the value string
	 *	@return		 AJA_SUCCESS if successful
	 */
	virtual AJAStatus GetValue(const AJASystemInfoTag inTag, std::string & outValue) const;
	
	/**
	 *	@brief		 Answers with the host system info label string for the given AJASystemInfoTag.
	 *	@param[in]	 inTag		The AJASystemInfoTag of interest
	 *	@param[out]	 outLabel	Receives the label string
	 *	@return		 AJA_SUCCESS if successful
	 */
	virtual AJAStatus GetLabel(const AJASystemInfoTag inTag, std::string & outLabel) const;

	/**
	 *	@brief		 Answers with a multi-line string that contains the complete host system info table.
	 *	@param[out]	 outAllLabelsAndValues	 Receives the string
	 */
	virtual void ToString (std::string & outAllLabelsAndValues) const;

	/**
	 *	@return		 A multi-line string containing the complete host system info table.
	 *	@param[in]	 inValueWrapLen		  Optionally specifies the maximum width of the "value" column,
	 *									  in characters. Zero, the default, disables wrapping.
	 *									  (However, wrapping always occurs on line-breaks (e.g. CRLF, LF, CR, etc.)).
	 *	@param[in]	 inGutterWidth		  Optionally specifies the gap ("gutter") between the "label"
	 *									  and "value" columns, in character spaces. Defaults to 3 spaces.
	 */
	virtual std::string ToString (const size_t inValueWrapLen = 0, const size_t inGutterWidth = 3) const;

public: //	Class Methods
	/**
	 *	@brief		 Generates a multi-line string from a "table" of label/value pairs that, when displayed
	 *				 in a monospaced font, appears as a neat, two-column table.
	 *	@param[in]	 inLabelValuePairs	  The AJALabelValuePairs to be formatted as a table.
	 *	@param[in]	 inValueWrapLen		  Optionally specifies the maximum width of the "value" column,
	 *									  in characters. Zero, the default, disables any/all wrapping.
	 *									  (However, wrapping always occurs on line-breaks (e.g. CRLF, LF, CR, etc.)).
	 *	@param[in]	 inGutterWidth		  Optionally specifies the gap ("gutter") between the "label"
	 *									  and "value" columns, in character spaces. Defaults to 3 spaces.
	 *	@return		 A multi-line string containing the formatted AJALabelValuePairs table.
	 *	@bug		 Multi-byte UTF8 characters need to be counted as one character.
	 */
	static std::string ToString (const AJALabelValuePairs & inLabelValuePairs, const size_t inValueWrapLen = 0, const size_t inGutterWidth = 3);

	/**
	 *	@brief		 A convenience function that appends the given label and value strings to the
	 *				 provided AJALabelValuePairs table.
	 *	@param		 inOutTable	  The AJALabelValuePairs table to be modified.
	 *	@param[in]	 inLabel	  Specifies the label string to use.
	 *	@param[in]	 inValue	  Specifies the value string to use. If empty, treat "inLabel" as a section heading.
	 *	@return		 A reference to the given AJALabelValuePairs.
	 */
	static inline AJALabelValuePairs & append (AJALabelValuePairs & inOutTable, const std::string & inLabel, const std::string & inValue = std::string())
												{inOutTable.push_back(AJALabelValuePair(inLabel,inValue)); return inOutTable;}

private:	//	Instance Data
	AJASystemInfoImpl* mpImpl;
};


/**
	@brief		Streams a human-readable representation of the AJASystemInfo into the given output stream.
	@param		outStream		The stream into which the given AJASystemInfo will be printed.
	@param[in]	inData			The AJASystemInfo to be streamed.
	@return		A reference to the given "outStream".
**/
AJA_EXPORT std::ostream & operator << (std::ostream & outStream, const AJASystemInfo & inData);

/**
	@brief		Streams a human-readable representation of the AJALabelValuePair into the given output stream.
	@param		outStream		The stream into which the given AJALabelValuePair will be printed.
	@param[in]	inData			The AJALabelValuePair to be streamed.
	@return		A reference to the given "outStream".
**/
AJA_EXPORT std::ostream & operator << (std::ostream & outStream, const AJALabelValuePair & inData);

/**
	@brief		Streams a human-readable representation of the AJALabelValuePairs into the given output stream.
	@param		outStream		The stream into which the given AJALabelValuePairs will be printed.
	@param[in]	inData			The AJALabelValuePairs to be streamed.
	@return		A reference to the given "outStream".
**/
AJA_EXPORT std::ostream & operator << (std::ostream & outStream, const AJALabelValuePairs & inData);

#endif	//	AJA_INFO_H