#ifndef LIB_ERROR_HANDLER_MQH_INCLUDED
#define LIB_ERROR_HANDLER_MQH_INCLUDED
#property version "4.0";
/**********************************************************************************
 * Copyright (C) 2010-2020 Dominik Egert <dominik.egert@freie-netze.de>
 *
 * This file is part of lib_bali
 *
 * lib_error.mqh may be copied and/or distributed at free will
 * Dominik Egert / Freie Netze UG.
 **********************************************************************************
 *
 *  Version 4.0
 *  State: public
 *
 *
 *  File information
 *  ================
 *
 *  Use: resolve error codes to text
 *
 *      Intention:
 *
 *          Extend the basic MQL error handling functions to cover custom codes.
 *          Easy and portable usage.
 *
 *          The basic idea is to extend and not replace the original implementation
 *          of the functions ResetLastError(), GetLastError(), SetUserError()
 *          All functions may be used paralell and interswitched, although the lib_err
 *          will loose its up to date state when intermixing calls with each other.
 *          This especially affects the comment function. Elsewise, you can simply resolve
 *          error codes by calling err_ResolveLastError(). This works with predefined 
 *          error codes as well as with user defined error codes.
 *
 *
 *      General usage
 *
 *          Three functions are supported:
 *              void err_SetUserError(const ushort err_code, const string ...)
 *              void err_ResetUserError()   
 *              const string err_ResolveLastError()
 *              const string err_ResolveLastError(int& error_code)
 *              const int    err_ResolveLastError(string& error_msg)
 *
 *          The functions err_SetUserError() simply replace the original functions from MQL. 
 *          Original and this extended version do not interfere with each other. Although, the 
 *          MQL version will not retrieve a value, if called after err_ResolveLastError().
 *
 *          The additional function is used to retrieve last error code and corresponding text.
 *          This works with all defined error codes, as well as predefined system codes.
 *
 *
 *      Defining own error codes
 *
 *          Error codes are split up into groupds, so first a unique group id must be defined.
 *          This ID must be unique within the same compilation project and may overlap if the 
 *          target binaries are different.
 *
 *          For error codes to be assigned convenient, it is needed to define 
 *          a set and a return code, the set code will have a prefix. Every error code gets 
 *          defined by helper macros.
 *
 *          All definitions must be inclosed within the beginning and ending macros.
 *
 *          Here is an example of how it will look like:
 *
 *              #define EA_ERRGROUP_CODE_EXAMPLE            0x01
 *
 *              // Define return codes
 *              #define EXMPL_SUCCESS                       LIB_ERROR_CODE(EA_ERRGROUP_CODE_EXAMPLE, 0x00)
 *              #define EXMPL_ERR_INVALID_VALUE             LIB_ERROR_CODE(EA_ERRGROUP_CODE_EXAMPLE, 0x01)
 *				#define EXMPL_INFO_CORE_READY               LIB_ERROR_CODE_HANDLED(EA_ERRGROUP_CODE_EXAMPLE, 0x01)
 *				#define EXMPL_WARN_PENDING_OPERATION        LIB_ERROR_CODE_WARNING(EA_ERRGROUP_CODE_EXAMPLE, 0x01)
 * 
 *              // Define message resolver
 *              LIB_ERR_REGISTER_RESOLVER_BEGIN(EA_ERRGROUP_CODE_EXAMPLE)
 *                  LIB_ERR_REGISTER_RESOLVER_MSGCODE(EXMPL_SUCCESS,              		"EXMPL_SUCCESS",              		"Operation success. All values could be calculated within given parameters.")
 *                  LIB_ERR_REGISTER_RESOLVER_MSGCODE(EXMPL_ERR_INVALID_VALUE,    		"EXMPL_ERR_INVALID_VALUE",    		"Operation aborted. Invalid function input.")
 *  				LIB_ERR_REGISTER_RESOLVER_MSGCODE(EXMPL_INFO_CORE_READY,            "CORE_INFO_CORE_READY",             "Expert advisor: Core ready.")
 *  				LIB_ERR_REGISTER_RESOLVER_MSGCODE(EXMPL_WARN_PENDING_OPERATION,		"CORE_WARN_PENDING_OPERATION",      "A pending operation is awaiting confirmation.")
 *              LIB_ERR_REGISTER_RESOLVER_END(EA_ERRGROUP_CODE_EXAMPLE)
 * 
 *
 *          IMPORTANT!!
 *
 *              The fisrt defined code MUST be the success code for routing to be correct. 
 *              It will be, no matter what you define here, always treated as success code.
 *              The success code is also equal to the group id.
 *
 *
 *          Reserved codes
 *
 *              To use reserved error codes, which is nothing different than splitting up the available
 *              error groups into two types, reserved and user defined, the defining macros in the example 
 *              above get exchanged with 
 *
 *                  LIB_ERROR_RESERVED_CODE()
 *                  LIB_ERR_RESERVED_REGISTER_RESOLVER_BEGIN()
 *                  LIB_ERR_RESERVED_REGISTER_RESOLVER_END()
 *
 *              Everything else stays the same. This enables to use internal or predefined error codes and
 *              still be able to define new codes, not interfering with each other due to duplicates.
 *
 *
 *          This now can be used anywhere in the code by calling...
 *
 *              SetUserError(EXMPL_SUCCESS, "Some additional comment!");
 *              SetUserError(EXMPL_SUCCESS, DBG_STR_PERSIST("Some additional comment! Will persist into release build."));
 *
 *
 *          ... and anywhere else be retrieved by
 *
 *              const string error_msg = err_ResolveLastError();
 *
 *                  ... or ...
 *                  
 *              int error_code = NULL;
 *              const string error_msg = err_ResolveLastError(error_code);
 *              
 *                  ... or ...
 *                  
 *              string error_msg = NULL
 *              const int error_code = err_ResolveLastError(error_msg);
 *
 *
 *      Hints:
 *
 *          It should be noted, retrieving the last error by calling err_ResolveLastError() will also reset the error state.
 *          There are a limited amount of user defined error codes available.
 *
 *              Current limit: ushort -> 16 Bit -> 65536 possible error codes.
 *                  The error code is split up into upper byte and lower byte. The upper byte is used as group id 
 *                  while the lower byte is used as error code id.
 *                  The group size geometry and the amount of internal group ids can be set below by altering the
 *                  appropiate defines.
 *
 *          In debug mode, the code will produce exits as any group id shows to be invalid. It may give false alarms 
 *          in case group ids are not ascendending defined. The runtime version will ignore such errors and simply 
 *          failroute to another router, not resolve at all and respond with "unknown error" or it simply works.
 *          In case all definitions are proper set up and the order is wrong at compile time, this will still result 
 *          in a working message router.
 *          
 *
*/




//*********************************************************************************************************************************************************/
// Global error handler configuration
//

/////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Setup Lib Error
//

// Configure for binary mode
//#define LIB_ERR_BINARY_LIBRARY

// Configure for binary library include
//#define LIB_ERR_LIB_IMPORT

// User supplied OnError handler (unavailable in binary library mode)
//#define LIB_ERR_USER_ERROR_HANDLER

// Generate unified function macro substitution
//#define LIB_ERROR_API_FUNCTION_SHADOWING

// Use CSV file as error description source
//#define LIB_ERROR_DESCRIPTION_FROM_FILE

// 
/////////////////////////////////////////////////////////////////////////////////////////////////////



/////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Define error group id 
//  This ID must be unique within
//  the given project.
//
//  Valid values for Group ID are
//  between 0x00 and 0xEF
//  0xF0 to 0xFF is reserved.
//
//  Error codes categories
//      0x00            = Succes 
//      0x01 ... 0xDF   = Errors, 
//      0xE0 ... 0xEF   = Warnings
//      0xF0 ... 0xFF   = Handled Errors
//
//  Define the size each error 
//  router can handle. (0x0100 = 256 here)
//
#define LIB_ERR_LEVEL_WARNING       0x00E0
#define LIB_ERR_LEVEL_HANDLED_ERROR 0x00F0
#define LIB_ERR_INTERNAL_GROUP_IDS  0xF000
#define LIB_ERR_GROUP_SIZE          0x0100

//
/////////////////////////////////////////////////////////////////////////////////////////////////////



/////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Define error messages 
//  output format
//

// Define error output format 
#define LIB_ERR_OUTPUT_FORMAT(_err_code_, _code_name_, _msg_) StringFormat("(%i - %s) %s", _err_code_, _code_name_, _msg_)

//
/////////////////////////////////////////////////////////////////////////////////////////////////////


//
// END Global error handler configuration
//*********************************************************************************************************************************************************/





/////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Include lib error
//

// Include definitions
#include "lib_error/lib_error_definitions.mqh"

//
/////////////////////////////////////////////////////////////////////////////////////////////////////




//*********************************************************************************************************************************************************/
// User defined OnError() handler 
//
#ifdef LIB_ERR_USER_ERROR_HANDLER

// Namespace handling
#ifndef __MQL4_COMPATIBILITY_CODE__
    namespace LibError { 
    #ifdef LIB_ERR_LIB_IMPORT
        namespace LibError {

    #endif

#endif


/////////////////////////////////////////////////////////
//
//  OnError() Function
//
//  Generic error handling function.
//  Some return codes are not of interest, so
//  they get sorted out here and are
//  surpressed of being journaled.
//
const bool UserOnError(int& err, const string prefix = NULL)
{
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    //
    //  Adjust your error handling behaviour here as you need.
    //  Do not forget to enbale the user supplied error handler macro. (LIB_ERR_USER_ERROR_HANDLER)
    //



    ///////////////////////////////////////            
    //
    // Treat certain environments 
    //  differently than others.
    //
    const static bool non_reporting_exec_env =   ( MQLInfoInteger(MQL_PROFILER)             // Is in profiler mode
                                                    || MQLInfoInteger(MQL_FORWARD)          // Is forward strategy tester
                                                    || MQLInfoInteger(MQL_OPTIMIZATION)     // Is running in optimization environment
                                                    || MQLInfoInteger(MQL_FRAME_MODE))      // Is running as optimization result receiver
                                              && ( !MQLInfoInteger(MQL_VISUAL_MODE)         // And is not strategy tester visual mode
                                                    || !MQLInfoInteger(MQL_DEBUG));         // Or not in debug mode

    
    
    ///////////////////////////////////////            
    //
    // Get and return current error code
    // 
    err = _LastError;



    ///////////////////////////////////////            
    //
    // Use a bitmask to filter error 
    //  codes for their severity.
    //
    // You may design this as you like.
    //  It all depends on how you set up 
    //  your error codes and what they mean.
    //
    //  Keep in mind, error code 0xxxxxxx00 
    //  is always a success code.
    //
    const int err_mask = 0x000000FF | (0x0000FF00 * (((err & 0xFFFF0000) == NULL) & 0x01));



    ///////////////////////////////////////            
    //
    // Success code, treat warnings 
    //  as success.
    //
    if( ((err & err_mask) == ERR_SUCCESS)
     || ((err_mask == 0xFF) && ((err & LIB_ERR_LEVEL_WARNING) == LIB_ERR_LEVEL_WARNING)) )
    {
		ResetUserErrorCode();
		return(false); 
    }



    ///////////////////////////////////////            
    //
    // Handled error codes return as 
    //  non error. Governed by the flag
    //  LIB_ERR_LEVEL_WARNING_AS_ERROR
    //
    else if((err_mask == 0xFF) && ((err & LIB_ERR_LEVEL_HANDLED_ERROR) == LIB_ERR_LEVEL_HANDLED_ERROR))
    #ifndef LIB_ERR_LEVEL_WARNING_AS_ERROR
    { return(false); }
	#else
    { return(true); }
	#endif



    ///////////////////////////////////////            
    //
    // Skip output for certain runtime 
    //  environments. 
    //
    if(non_reporting_exec_env)
    { return(true); }



    ///////////////////////////////////////
    //
    // Default action to perform on error
    //
    //  This is not very compatible with
    //  mql4, as printf does not respect
    //  new lines. 
    //
    // Calling ResolveLastErrorCode with 
    // an error code of -1 will read last
    // occured error from API.
    //
    #ifndef __MQL4_COMPATIBILITY_CODE__
        printf("%s", ResolveLastErrorCode(-1, prefix));

    #else 
        // MQL4 compatible multi line output
        string out = ResolveLastErrorCode(-1, prefix);
        string multipart[];
        StringReplace(out, "\r", "");
        const int lines = StringSplit(out, 0x0A, multipart);

        // Multiline journal output support
        for(int cnt = lines - 1; (cnt >= NULL) && !_StopFlag; cnt--)
        { printf("%s", multipart[cnt]); };
    
    #endif


    // Return error state
    return(true);

    //
    //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
}
//
/////////////////////////////////////////////////////////


//	End namespace handling
#ifndef __MQL4_COMPATIBILITY_CODE__
    };
    #ifdef LIB_ERR_LIB_IMPORT
        }; // Namespace LibError

    #endif

#endif


//	End UserOnError() definition
#endif
//
// END User defined OnError() handler 
//*********************************************************************************************************************************************************/





/////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Function name macro substitutions
//

// Declare MQL4 function names as macros
#ifdef __MQL4_COMPATIBILITY_CODE__
    #define err_SetUserError 		    LIB_ERR_NAMESPACE(LibError, SetUserErrorCode)
    #define err_ResetLastError          LIB_ERR_NAMESPACE(LibError, ResetUserErrorCode)
    #define err_GetLastError		    LIB_ERR_NAMESPACE(LibError, GetLastErrorCode)
    #define SetMqlError				    LIB_ERR_NAMESPACE(LibError, SetMqlErrorCode)
    #define ResetUserError			    LIB_ERR_NAMESPACE(LibError, ResetUserErrorCode)
    #define ResolveLastError		    LIB_ERR_NAMESPACE(LibError, ResolveLastErrorCode)
    #define GetLastResolvedError        LIB_ERR_NAMESPACE(LibError, GetLastResolvedErrorCode)
    #define OnError                     LIB_ERR_NAMESPACE(LibError, OnErrorFunction)
    #ifdef LIB_ERROR_API_FUNCTION_SHADOWING
    	#define SetUserError 			LIB_ERR_NAMESPACE(LibError, SetUserErrorCode)
    	#define ResetLastError 			LIB_ERR_NAMESPACE(LibError, ResetUserErrorCode)
    	#define GetLastError			LIB_ERR_NAMESPACE(LibError, GetLastErrorCode)
    
    #endif

#endif

#ifndef LIB_ERR_LIB_IMPORT
    #ifndef __MQL4_COMPATIBILITY_CODE__
    	#ifdef LIB_ERROR_API_FUNCTION_SHADOWING
    		#define SetUserError 			LIB_ERR_NAMESPACE(LibError, SetUserErrorCode)
    		#define ResetLastError 			LIB_ERR_NAMESPACE(LibError, ResetUserErrorCode)
    		#define GetLastError			LIB_ERR_NAMESPACE(LibError, GetLastErrorCode)
            #define err_SetUserError 		LIB_ERR_NAMESPACE(LibError, SetUserErrorCode)
            #define err_ResetLastError      LIB_ERR_NAMESPACE(LibError, ResetUserErrorCode)
            #define err_GetLastError		LIB_ERR_NAMESPACE(LibError, GetLastErrorCode)
            #define SetMqlError				LIB_ERR_NAMESPACE(LibError, SetMqlErrorCode)
            #define ResetUserError			LIB_ERR_NAMESPACE(LibError, ResetUserErrorCode)
            #define ResolveLastError		LIB_ERR_NAMESPACE(LibError, ResolveLastErrorCode)
            #define GetLastResolvedError    LIB_ERR_NAMESPACE(LibError, GetLastResolvedErrorCode)
            #define OnError                 LIB_ERR_NAMESPACE(LibError, OnErrorFunction)
    
        #else
        	#define err_SetUserError 		LibError::SetUserErrorCode
        	#define err_ResetLastError 		LibError::ResetUserErrorCode
        	#define err_GetLastError		LibError::GetLastErrorCode
        	#define SetMqlError			    SetMqlErrorCode
        	#define ResetUserError			ResetUserErrorCode
        	#define ResolveLastError		ResolveLastErrorCode
        	#define GetLastResolvedError    GetLastResolvedErrorCode
            #define OnError                 OnErrorFunction
    
        #endif
    
    #endif

#endif

#ifdef LIB_ERR_LIB_IMPORT
    #ifndef __MQL4_COMPATIBILITY_CODE__
    	#ifdef LIB_ERROR_API_FUNCTION_SHADOWING
    		#define SetUserError 			LibError::LibError::SetUserErrorCode
    		#define ResetLastError 			LibError::LibError::ResetUserErrorCode
    		#define GetLastError			LibError::LibError::GetLastErrorCode
            #define err_SetUserError 		LibError::LibError::SetUserErrorCode
            #define err_ResetLastError      LibError::LibError::ResetUserErrorCode
            #define err_GetLastError		LibError::LibError::GetLastErrorCode
            #define SetMqlError				LibError::LibError::SetMqlErrorCode
            #define ResetUserError			LibError::LibError::ResetUserErrorCode
            #define ResolveLastError		LibError::LibError::ResolveLastErrorCode
            #define GetLastResolvedError    LibError::LibError::GetLastResolvedErrorCode
            #define OnError                 LibError::LibError::OnErrorFunction
    
        #else
            #define err_SetUserError 		LibError::SetUserErrorCode
            #define err_ResetLastError      LibError::ResetUserErrorCode
            #define err_GetLastError		LibError::GetLastErrorCode
            #define SetMqlError				LibError::SetMqlErrorCode
            #define ResetUserError			LibError::ResetUserErrorCode
            #define ResolveLastError		LibError::ResolveLastErrorCode
            #define GetLastResolvedError    LibError::GetLastResolvedErrorCode
            #define OnError                 LibError::OnErrorFunction
    
        #endif

    #endif 

#endif

//
/////////////////////////////////////////////////////////////////////////////////////////////////////
#endif // LIB_ERROR_HANDLER_MQH_INCLUDED