[Architecture Proposal] Refactoring Instruction class to improve decoupling and extensibility

[badboy1981]

[Architecture Proposal] Refactoring Instruction class to improve decoupling and extensibility

Context

After analyzing the project structure and core logic, specifically within the LadderApp/Model/Instructions/ directory, I’ve identified several areas where refactoring could align with the project's roadmap goals, such as "Big code refactoring" and "Decoupling the ladder language processor".

Observed Issues

1. Single Responsibility Principle (SRP) Violation: The Instruction.cs class currently manages base properties, XML serialization, and complex validation logic.
2. Maintenance Complexity: The ValidateAddress method uses a large switch-case block to handle different instruction types (Timers, Counters, Coils). This makes the base class fragile and violates the Open/Closed Principle, as adding new instructions requires modifying the base class.
3. Redundant Code: There is a significant amount of commented-out logic in Instruction.cs which impacts code readability.
4. Interface Utilization: The IInstruction interface is currently thin. Moving more behavioral definitions (like validation) here would improve polymorphism.

Proposed Solution

• Decouple Validation: Move the logic currently inside ValidateAddress into specific subclasses (e.g., TimerInstruction, CounterInstruction) by overriding a virtual validation method.
• Lean Base Class: Refactor Instruction.cs to hold only common metadata and delegate specific logic to derived classes.
• Enhance IInstruction: Update the interface to include a Validate() contract that all instructions must fulfill.

Impact

This refactoring is a prerequisite for successfully extending the base code to other platforms like Arduino, PIC, or STM32, as it will make the logic processor platform-agnostic and easier to test.

I am interested in contributing to this project. If you agree with this direction, I can prepare a Pull Request for these changes.