//+------------------------------------------------------------------+
//|                                                      BOS_CHOCH.mq5|
//|                        Copyright 2023, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2023, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property indicator_chart_window
#property indicator_buffers 2
#property indicator_plots   2
#property indicator_color1  clrGreen
#property indicator_color2  clrRed
#property indicator_width1  2
#property indicator_width2  2

// Indicator Buffers
double BOSBuffer[];
double CHOCHBuffer[];

// Input parameters
input int lookbackPeriod = 50; // Number of candles to look back for structure analysis

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
{
    // Set up indicator buffers
    SetIndexBuffer(0, BOSBuffer, INDICATOR_DATA);
    SetIndexBuffer(1, CHOCHBuffer, INDICATOR_DATA);
    
    // Set up indicator labels
    IndicatorSetString(INDICATOR_SHORTNAME, "BOS & CHOCH Detector");
    IndicatorSetInteger(INDICATOR_DIGITS, _Digits);
    
    return(INIT_SUCCEEDED);
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
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[])
{
    // Loop through all candles
    for (int i = prev_calculated; i < rates_total; i++)
    {
        // Detect BOS (Break of Structure)
        if (IsBOS(i, high, low, lookbackPeriod))
        {
            BOSBuffer[i] = high[i]; // Mark BOS on the chart
        }
        else
        {
            BOSBuffer[i] = EMPTY_VALUE;
        }

        // Detect CHOCH (Change of Character)
        if (IsCHOCH(i, high, low, lookbackPeriod))
        {
            CHOCHBuffer[i] = low[i]; // Mark CHOCH on the chart
        }
        else
        {
            CHOCHBuffer[i] = EMPTY_VALUE;
        }
    }

    return(rates_total);
}

//+------------------------------------------------------------------+
//| Function to detect Break of Structure (BOS)                      |
//+------------------------------------------------------------------+
bool IsBOS(int index, const double &high[], const double &low[], int lookback)
{
    // Check if the current high is higher than the previous highs
    for (int i = 1; i <= lookback; i++)
    {
        if (index - i >= 0 && high[index] <= high[index - i])
        {
            return false;
        }
    }
    return true;
}

//+------------------------------------------------------------------+
//| Function to detect Change of Character (CHOCH)                   |
//+------------------------------------------------------------------+
bool IsCHOCH(int index, const double &high[], const double &low[], int lookback)
{
    // Check if the current low is lower than the previous lows
    for (int i = 1; i <= lookback; i++)
    {
        if (index - i >= 0 && low[index] >= low[index - i])
        {
            return false;
        }
    }
    return true;
}