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Indicators/MyIndicators/MFI_Pro.md

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+# Money Flow Index (MFI) Professional
+
+## 1. Summary (Introduction)
+
+The Money Flow Index (MFI) is a momentum oscillator that measures the strength of money flowing into and out of a security. Developed as a "volume-weighted RSI," it combines both price and volume data to identify overbought or oversold conditions.
+
+Unlike the standard RSI which only considers price, the MFI incorporates volume to provide a clearer picture of the conviction behind price moves.
+
+Our `MFI_Pro` implementation is a unified, professional version that allows the calculation to be based on either **standard** or **Heikin Ashi** price data, selectable from a single input parameter.
+
+## 2. Mathematical Foundations and Calculation Logic
+
+The MFI calculation is similar to the RSI, but instead of using simple price changes, it uses "Money Flow," which is derived from the Typical Price and Volume.
+
+### Required Components
+
+* **Period (N):** The lookback period for the calculation (e.g., 14).
+* **Price and Volume Data:** The `High`, `Low`, `Close`, and `Volume` of each bar.
+
+### Calculation Steps (Algorithm)
+
+1. **Calculate the Typical Price (TP):** For each bar, calculate the average of the high, low, and close.
+    $\text{TP}_i = \frac{\text{High}_i + \text{Low}_i + \text{Close}_i}{3}$
+
+2. **Calculate the Raw Money Flow (RMF):** Multiply the Typical Price by the volume for that period.
+    $\text{Raw Money Flow}_i = \text{TP}_i \times \text{Volume}_i$
+
+3. **Determine Positive and Negative Money Flow:** Compare the current bar's Typical Price to the previous bar's.
+    * If $\text{TP}_i > \text{TP}_{i-1}$, it is **Positive Money Flow** ($\text{PMF}_i = \text{RMF}_i$).
+    * If $\text{TP}_i < \text{TP}_{i-1}$, it is **Negative Money Flow** ($\text{NMF}_i = \text{RMF}_i$).
+
+4. **Calculate the Money Flow Ratio:** Sum the Positive and Negative Money Flows over the period `N` and calculate their ratio.
+    $\text{Money Flow Ratio} = \frac{\sum_{k=i-N+1}^{i} \text{PMF}_k}{\sum_{k=i-N+1}^{i} \text{NMF}_k}$
+
+5. **Calculate the Money Flow Index (MFI):** Use the ratio to scale the value between 0 and 100.
+    $\text{MFI}_i = 100 - \frac{100}{1 + \text{Money Flow Ratio}}$
+
+## 3. MQL5 Implementation Details
+
+Our MQL5 implementation follows a modern, object-oriented design to ensure stability, reusability, and maintainability.
+
+* **Modular Calculation Engine (`MFI_Calculator.mqh`):**
+    The entire calculation logic is encapsulated within a reusable include file.
+  * **`CMFICalculator`**: The base class that performs the full MFI and signal line calculation on a given source price.
+  * **`CMFICalculator_HA`**: A child class that inherits all the complex logic and only overrides the initial data preparation step to use the Typical Price derived from smoothed Heikin Ashi candles. This object-oriented approach eliminates code duplication.
+
+* **Stability via Full Recalculation:** We employ a "brute-force" full recalculation within `OnCalculate` for maximum stability.
+
+* **Efficient Calculation:** The summation of Positive and Negative Money Flow is handled by an efficient **sliding window sum** technique.
+
+* **Optional Signal Line:** Our version is enhanced with a user-configurable moving average signal line, with all MA types calculated manually for robustness.
+
+## 4. Parameters
+
+* **MFI Period (`InpMFIPeriod`):** The lookback period for summing the money flows. The standard is `14`.
+* **Candle Source (`InpCandleSource`):** Allows the user to select the candle type for the Typical Price calculation (`Standard` or `Heikin Ashi`).
+* **Volume Type (`InpVolumeType`):** Allows the user to select between Tick Volume and Real Volume.
+* **Signal Line Settings:**
+  * `InpMAPeriod`: The lookback period for the signal line.
+  * `InpMAMethod`: The type of moving average for the signal line.
+
+## 5. Usage and Interpretation
+
+* **Overbought/Oversold Levels:** The primary use of the MFI is to identify extreme conditions.
+  * **Overbought:** Readings above **80**.
+  * **Oversold:** Readings below **20**.
+* **Divergence:** This is the MFI's most powerful signal.
+  * **Bullish Divergence:** Price makes a lower low, but the MFI makes a higher low, suggesting selling pressure is weakening.
+  * **Bearish Divergence:** Price makes a higher high, but the MFI makes a lower high, suggesting buying pressure is weakening.
+* **Signal Line Crossovers:** Crossovers can provide entry and exit signals, similar to other oscillators.
+* **Caution:** In a very strong trend, the MFI can remain in overbought or oversold territory for extended periods.