//+------------------------------------------------------------------+
//|                                                  CommandsApi.mqh |
//|                                  Copyright 2026, Niquel Mendoza. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2026, Niquel Mendoza."
#property link      "https://www.mql5.com"
#property strict

#ifndef TELEGRAMBYLEO_SRC_COMMANDSAPI_MQH
#define TELEGRAMBYLEO_SRC_COMMANDSAPI_MQH

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
#include "Events.mqh"

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
namespace TSN
{
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
class CTelegramCommandBot : public CTelegramBot
 {
protected:
                     CHashMapFast(ulong, int) m_commands;
  // por ahora si quizas luego lista de priridad con un sorted list

  //---
  bool               ResolveCommand(const uchar& in[], int i, int len);
  bool               IsMyUsername(const uchar& in[], int i, int e);

  //--- Cada comando
  virtual void       OnCommand(int command_idx, long chat_id, CJsonNode& json) {}

public:
                     CTelegramCommandBot(void) {}
                    ~CTelegramCommandBot(void) {}

  //---
  void               SetCommand(const string& command, int idx);
  bool               RemoveCommand(const string& command);

  //---
  void               OnMessage(CJsonNode& node) override final;
 };

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
bool CTelegramCommandBot::IsMyUsername(const uchar& in[], int i, int e)
 {
//---
// 1. e apnta a la posicion "end + 1"

//---
  const int my_len = StringLen(m_me.username); // len del user name que tenemos
  const int l = (e - i); // len de lo que encontramos
  if(l != my_len) // no es igual...
    return false;

//---
  for(int x = 0; x < l; x++)
    if(in[i++] != m_me.username[x])
      return false;

//---
  return true;
 }

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
bool CTelegramCommandBot::ResolveCommand(const uchar &in[], int i, int len)
 {
// len = min
  len += i;
  i++; // salta \

//---
// 1. una sola pasada para veriicar y hash (no dos)
  ulong h = FNV_OFFSET_BASIS;
  uchar c = in[i];
  while(true)
   {
    if(c == ' ' || c == '@')
      break;

    //--
    h ^= c;
    h *= FNV_PRIME;

    //--
    if(++i >= len)
      break;

    //---
    c = in[i];
   }

//---
  if(i < len && c == '@')
   {
    //---
    i++; // salta '@'
    int bot_start = i;
    while(i < len && in[i] != ' ')
      i++;

    //---
    if(!IsMyUsername(in, bot_start, i))
      return false;
   }

//---
// vol en vez de int (ternario menos par ael TryGet==true? 1 : value)
  return m_commands.ContainsKey(h);
 }

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void CTelegramCommandBot::SetCommand(const string &command, int idx)
 {
//--- hash
  ulong h = FNV_OFFSET_BASIS;
  const int len = StringLen(command);
  FNV1a_64_AsM_Str(command, len, h, FNV_PRIME)

//---
  if(m_commands.ReserveSlot(h)) // no existe
   {
    const uint p = m_commands.m_last_pos_tbl;
    m_commands.m_table[p].key  = h;
    m_commands.m_table[p].value = idx;
   }
  else
   {
    // Ya existe... modificamos el valor
    m_commands.m_table[m_commands.m_last_pos_tbl].value = idx;
   }
 }

//+------------------------------------------------------------------+
bool CTelegramCommandBot::RemoveCommand(const string &command)
 {
//--- hash
  ulong h = FNV_OFFSET_BASIS;
  const int len = StringLen(command);
  FNV1a_64_AsM_Str(command, len, h, FNV_PRIME)

//---
  return m_commands.Remove(h);
 }

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void CTelegramCommandBot::OnMessage(CJsonNode &node)
 {
//---
  CJsonNode text = node["text"];
  const int start = text.StrStart();
  const int len = text.StrLenRaw();
  if(!text.IsValid() || len < 1 || text.m_ctx.m_raw[start] != '/')
    return;

//---
//parseamos el texto inplace (sobre buffer ucahr) sin copia y conusltmaos el indice del grupo (commmando) via hashmap
  if(!ResolveCommand(text.m_ctx.m_raw, start, len))
   {
    return;
   }

//---
  const uint p = m_commands.m_last_pos_tbl;
  OnCommand(m_commands.m_table[p].value, node["chat"]["id"].ToInt(0), node);
 }
}
//+------------------------------------------------------------------+
#endif // TELEGRAMBYLEO_SRC_COMMANDSAPI_MQH