#property copyright "Your Name"
#property link      "https://www.example.com"
#property version   "1.00"
#property indicator_chart_window
#property indicator_buffers 0
#property indicator_plots   0

// Input parameters
input int SwingPeriod = 5; // Lookback period for swing detection

// Global variables
double LastSwingHigh = 0, LastSwingLow = 0;
bool IsBullish = false;

//+------------------------------------------------------------------+
int OnInit()
{
   return(INIT_SUCCEEDED);
}

//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
{
   // Start from the latest bar
   for(int i = rates_total - prev_calculated - 1; i >= 0; i--)
   {
      // Detect swing high and low
      if(IsSwingHigh(high, low, i, SwingPeriod))
      {
         LastSwingHigh = high[i];
         CheckStructure(i, high[i], low[i], time[i]);
      }
      if(IsSwingLow(high, low, i, SwingPeriod))
      {
         LastSwingLow = low[i];
         CheckStructure(i, high[i], low[i], time[i]);
      }
   }
   return(rates_total);
}

//+------------------------------------------------------------------+
bool IsSwingHigh(const double &high[], const double &low[], int index, int period)
{
   if(index < period || index >= ArraySize(high) - period) return false;
   for(int i = 1; i <= period; i++)
   {
      if(high[index] <= high[index - i] || high[index] <= high[index + i])
         return false;
   }
   return true;
}

//+------------------------------------------------------------------+
bool IsSwingLow(const double &high[], const double &low[], int index, int period)
{
   if(index < period || index >= ArraySize(low) - period) return false;
   for(int i = 1; i <= period; i++)
   {
      if(low[index] >= low[index - i] || low[index] >= low[index + i])
         return false;
   }
   return true;
}

//+------------------------------------------------------------------+
void CheckStructure(int index, double high, double low, datetime time)
{
   // Determine trend direction
   if(LastSwingHigh > 0 && LastSwingLow > 0)
   {
      IsBullish = (LastSwingHigh > LastSwingLow);

      // Check for BOS
      if(IsBullish && high > LastSwingHigh)
      {
         LastSwingHigh = high;
         ObjectCreate(0, "BOS_" + TimeToString(time), OBJ_TEXT, 0, time, high);
         ObjectSetString(0, "BOS_" + TimeToString(time), OBJPROP_TEXT, "BOS");
         ObjectSetInteger(0, "BOS_" + TimeToString(time), OBJPROP_COLOR, clrGreen);
         Alert("Break of Structure (BOS) detected at " + DoubleToString(high, 5));
      }
      else if(!IsBullish && low < LastSwingLow)
      {
         LastSwingLow = low;
         ObjectCreate(0, "BOS_" + TimeToString(time), OBJ_TEXT, 0, time, low);
         ObjectSetString(0, "BOS_" + TimeToString(time), OBJPROP_TEXT, "BOS");
         ObjectSetInteger(0, "BOS_" + TimeToString(time), OBJPROP_COLOR, clrRed);
         Alert("Break of Structure (BOS) detected at " + DoubleToString(low, 5));
      }

      // Check for CHoCH
      if(IsBullish && low < LastSwingLow)
      {
         LastSwingLow = low;
         ObjectCreate(0, "CHoCH_" + TimeToString(time), OBJ_TEXT, 0, time, low);
         ObjectSetString(0, "CHoCH_" + TimeToString(time), OBJPROP_TEXT, "CHoCH");
         ObjectSetInteger(0, "CHoCH_" + TimeToString(time), OBJPROP_COLOR, clrRed);
         Alert("Change of Character (CHoCH) detected at " + DoubleToString(low, 5));
         IsBullish = false; // Trend may reverse
      }
      else if(!IsBullish && high > LastSwingHigh)
      {
         LastSwingHigh = high;
         ObjectCreate(0, "CHoCH_" + TimeToString(time), OBJ_TEXT, 0, time, high);
         ObjectSetString(0, "CHoCH_" + TimeToString(time), OBJPROP_TEXT, "CHoCH");
         ObjectSetInteger(0, "CHoCH_" + TimeToString(time), OBJPROP_COLOR, clrGreen);
         Alert("Change of Character (CHoCH) detected at " + DoubleToString(high, 5));
         IsBullish = true; // Trend may reverse
      }
   }
}

//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
   ObjectsDeleteAll(0, "BOS_");
   ObjectsDeleteAll(0, "CHoCH_");
}