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refactor: Optimized for incremental calculation

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Indicators/MyIndicators/ALMA_Pro.md
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# Arnaud Legoux Moving Average (ALMA) Professional
# Arnaud Legoux Moving Average (ALMA) Pro
## 1. Summary (Introduction)
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* **Modular Calculator Engine (`ALMA_Calculator.mqh`):**
All core calculation logic is encapsulated within a reusable include file. This separates the mathematical complexity from the indicator's user interface and buffer management.
* **Optimized Incremental Calculation:**
Unlike basic implementations that recalculate the entire history on every tick, this indicator employs an intelligent incremental algorithm.
* It utilizes the `prev_calculated` state to determine the exact starting point for updates.
* **Persistent State:** The internal price buffer (`m_price`) persists its state between ticks. This allows the calculation to efficiently access historical price data for the weighted sum without re-copying the entire series.
* This results in **O(1) complexity** per tick, ensuring instant updates and zero lag, even on charts with extensive history.
* **Object-Oriented Design (Inheritance):**
* A base class, `CALMACalculator`, handles the core ALMA algorithm and the preparation of all **standard price types** (Close, Open, Median, etc.).
* A derived class, `CALMACalculator_HA`, inherits from the base class and **overrides** only one specific function: the price preparation. Its sole responsibility is to calculate Heikin Ashi candles and provide the selected HA price to the base class's ALMA algorithm. This is a clean and efficient use of polymorphism.
* **Simplified Main Indicator (`ALMA_Pro.mq5`):**
The main indicator file is now extremely clean. Its primary roles are:
1. Handling user inputs (`input` variables).
2. Instantiating the correct calculator object (`CALMACalculator` or `CALMACalculator_HA`) in `OnInit()` based on the user's choice.
3. Delegating the entire calculation process to the calculator object with a single call in `OnCalculate()`.
* **Stability via Full Recalculation:** We continue to use a full recalculation on every tick. This "brute-force" approach is the most robust method for state-dependent or multi-stage calculations, eliminating potential errors from `prev_calculated` logic during history loading or timeframe changes.
## 4. Parameters (`ALMA_Pro.mq5`)
* **Window Size / Period (`InpAlmaPeriod`):** The lookback period for the moving average. Default is `9`.