MQLArticles/PosMgmt/Partials.mqh

<EFBFBD><EFBFBD>//+------------------------------------------------------------------+

//|                                                     Partials.mqh |

//|                                  Copyright 2025, Niquel Mendoza. |

//|                     https://www.mql5.com/es/users/nique_372/news |

//+------------------------------------------------------------------+

#property copyright "Copyright 2025, Niquel Mendoza."

#property link      "https://www.mql5.com/es/users/nique_372/news"

#property strict



#ifndef MQLARTICLES_POSMGMT_PARTIALS_MQH

#define MQLARTICLES_POSMGMT_PARTIALS_MQH



//+------------------------------------------------------------------+

//| Include                                                          |

//+------------------------------------------------------------------+

#include  "..\\RM\\RiskManagement.mqh"



//+------------------------------------------------------------------+

//| Structures                                                       |

//+------------------------------------------------------------------+

struct PartialTakeProfit

 {

  double             partial_price;

  double             tp_level_percentage;

  double             volume_percentage_to_close;



  inline void               Reset()

   {

    ZeroMemory(this);

   }



 };



struct TrackedPosition

 {

  PartialTakeProfit  tp_levels[];

  ulong              ticket;

  ENUM_POSITION_TYPE type;

  int                current_partial_index;

 };



//+------------------------------------------------------------------+

//| Defines                                                          |

//+------------------------------------------------------------------+

#define CPARCIAL_RESERVE_ARR 5

#define CPARCIAL_RESERVE_TO_DELETE 5

#define PARTIAL_NO_APPLIED "0"



//+------------------------------------------------------------------+

//| Class that implements partial closures                           |

//+------------------------------------------------------------------+

class CPartials : public CAccountGestor

 {

private:

  //--- General variables

  ulong              m_magic_number;          // Magic number used to apply partials only to certain operations

  CTrade*            m_trade_executor;        // CTrade type instance to apply partials

  bool               m_disable_partials_flag; // Boolean that indicates if partials can be executed

  bool               m_auto;



  //--- Symbol variables

  string             m_trading_symbol;     // Symbol from which minimum volume and volume step data will be obtained

  double             m_volume_step;        // Volume step

  double             m_minimum_volume;     // Minimum volume

  int                m_price_digits;       // Symbol digits

  MqlTick            m_latest_tick;        // MqlTick type structure



  //--- Variables for partials

  int                m_max_partial_levels;  // Number of partials to take from each operation

  TrackedPosition    m_tracked_positions[]; // Array of operations to which partials will be applied

  int                m_indices_to_remove[]; // Indices to remove from the m_tracked_positions array



  //--- Arrays to take, both arrays must be the same size.

  double             m_volume_percentages_to_close[];

  double             m_tp_level_percentages[];





  //--- Temporary hashmap

  CHashMap<double, double> m_temporary_hashmap;





  //--- Function to add a new partial to the internal array

  void               AddToTrackedPositions(TrackedPosition & new_tracked_position);





public:

                     CPartials();

                    ~CPartials();



  //--- Initialize function

  bool               Init(ulong magic_number_, string symbol_, string volume_percentages_string, string tp_percentages_string);





  //--- Main function for position review

  void               CheckTrackedPositions();



  //--- Function that will be automatically invoked by account status each time a position is opened or closed

  void               OnOpenClosePosition(const ROnOpenClosePosition &pos) override;





  //--- Function to add a position to the internal array manually (this is automatically invoked in OnOpen..... for all positions

  // opened with the magic number and with a valid tp).

  bool               AddPositionToTrack(ulong position_ticket, double position_tp, double entry_price, ENUM_POSITION_TYPE position_type, string symbol);

  bool               AddPositionToTrack(ulong position_ticket);



  //--- Function that returns true if partials are allowed to be used

  inline bool        IsPartialsEnabled() const { return m_disable_partials_flag == false; }



  //---

  // Auto mode

  inline bool        AutoMode() const { return m_auto; }

  void               AutoMode(bool auto) { m_auto = auto; }



  // Symbol

  inline string      Symbol() const { return m_trading_symbol; }



  // Magic

  inline ulong       MagicNumber() const { return m_magic_number; }

 };



//+------------------------------------------------------------------+

//| Constructor and Destructor                                       |

//+------------------------------------------------------------------+

CPartials::CPartials()

  : m_magic_number(NOT_MAGIC_NUMBER), m_disable_partials_flag(true), m_trading_symbol(NULL), m_volume_step(0.00),

    m_minimum_volume(0.00), m_price_digits(0), m_max_partial_levels(0), m_auto(true)

 {

  m_trade_executor = new CTrade();

 }



//+------------------------------------------------------------------+

CPartials::~CPartials()

 {

  if(::CheckPointer(m_trade_executor) == POINTER_DYNAMIC)

    delete m_trade_executor;

 }



//+------------------------------------------------------------------+

//| Initialization function                                          |

//+------------------------------------------------------------------+

bool CPartials::Init(ulong magic_number_, string symbol_, string volume_percentages_string, string tp_percentages_string)

 {

//--- Validate if the strings are valid

  if(volume_percentages_string == PARTIAL_NO_APPLIED  || tp_percentages_string == PARTIAL_NO_APPLIED) // "0" as an invalid value

   {

    m_disable_partials_flag = true;

    return false;

   }



//--- Set the variables

  m_disable_partials_flag = false;

  m_magic_number = magic_number_;

  m_trading_symbol = symbol_;

  m_volume_step = ::SymbolInfoDouble(m_trading_symbol, SYMBOL_VOLUME_STEP);

  m_minimum_volume = ::SymbolInfoDouble(m_trading_symbol, SYMBOL_VOLUME_MIN);

  m_price_digits = (int)::SymbolInfoInteger(m_trading_symbol, SYMBOL_DIGITS);

  m_trade_executor.SetExpertMagicNumber(m_magic_number);



//--- Initial resize

  ::ArrayResize(m_tracked_positions, 0, CPARCIAL_RESERVE_ARR);

  ::ArrayResize(m_indices_to_remove, 0, CPARCIAL_RESERVE_TO_DELETE);



//--- Convert strings to double arrays

  StrTo::CstArray(m_volume_percentages_to_close, volume_percentages_string, ',');

  StrTo::CstArray(m_tp_level_percentages, tp_percentages_string, ',');





//--- 2nd validation, we validate that the array size is valid

  if(m_volume_percentages_to_close.Size() < 1 || m_tp_level_percentages.Size() < 1)

   {

    LogCriticalError(::StringFormat("The size of the partial arrays to take %u or percentages to take %u are invalid", m_volume_percentages_to_close.Size(), m_tp_level_percentages.Size()), FUNCION_ACTUAL);

    m_disable_partials_flag = true;

    return false;

   }



//--- 3rd validation, we validate that both arrays are the same size

  if(m_volume_percentages_to_close.Size() != m_tp_level_percentages.Size())

   {

    LogCriticalError(::StringFormat("The size of the partial arrays to take %u and percentages to take %u are not equal", m_volume_percentages_to_close.Size(), m_tp_level_percentages.Size()), FUNCION_ACTUAL);

    m_disable_partials_flag = true;

    return false;

   }



//--- Initial log only if "info" type log is enabled

  if(IsInfoLogEnabled())

   {

    FastLog(FUNCION_ACTUAL, INFO_TEXT, "Arrays before revision");

    PrintArrayAsTable(m_tp_level_percentages, "Percentage of position where partials will be taken", "percentages simplified");

    PrintArrayAsTable(m_volume_percentages_to_close, "Percentage to take", "percentages simplified");

   }



//--- Declaration of indices to remove and hashmap cleanup

  m_temporary_hashmap.Clear();

  int indices_to_remove_temp[];



//--- Iteration and array cleanup

  for(int i = 0; i < ::ArraySize(m_tp_level_percentages); i++)

   {

    if(m_tp_level_percentages[i] <= 0.00)

     {

      LogWarning(::StringFormat("The percentage where partials will be taken %f with index %d is invalid, therefore it will not be considered in partials", m_tp_level_percentages[i], i), FUNCION_ACTUAL);

      AddArrayNoVerification(indices_to_remove_temp, i, 0);

      continue;

     }



    if(m_volume_percentages_to_close[i] <= 0.00)

     {

      LogWarning(::StringFormat("The percentage to take %f with index %d is invalid, therefore it will not be considered in partials", m_volume_percentages_to_close[i], i), FUNCION_ACTUAL);

      AddArrayNoVerification(indices_to_remove_temp, i, 0);

      continue;

     }



    if(m_temporary_hashmap.ContainsKey(m_tp_level_percentages[i]))

      AddArrayNoVerification(indices_to_remove_temp, i, 0);

    else

      m_temporary_hashmap.Add(m_tp_level_percentages[i], m_volume_percentages_to_close[i]);

   }



//--- Sort and removal

  RemoveMultipleIndexes(m_tp_level_percentages, indices_to_remove_temp, 0);

  ::ArraySort(m_tp_level_percentages);

  ::ArrayResize(m_volume_percentages_to_close, ::ArraySize(m_tp_level_percentages));





//--- Final iteration

  for(int i = 0; i < ::ArraySize(m_tp_level_percentages); i++)

   {

    double val;

    m_temporary_hashmap.TryGetValue(m_tp_level_percentages[i], val);



    m_volume_percentages_to_close[i] = val / 100.0;

    m_tp_level_percentages[i] /= 100.0;

   }



//--- Final log

  if(IsInfoLogEnabled())

   {

    FastLog(FUNCION_ACTUAL, INFO_TEXT, "Arrays after revision");

    PrintArrayAsTable(m_tp_level_percentages, "Percentage of position where partials will be taken", "percentages simplified");

    PrintArrayAsTable(m_volume_percentages_to_close, "Percentage to take", "percentages simplified");

   }



  m_max_partial_levels = ::ArraySize(m_volume_percentages_to_close);

  return true;

 }