# Walkthrough - SecInterp Refactor & Optimization

This document summarizes the major improvements made to the SecInterp plugin, focusing on architectural separation and code quality.

## Export Logic Refactor (Latest)

The export system has been refactored to decouple business logic from the GUI and unify all export operations.

- **Centralized Orchestration**: Created `core/services/export_service.py` to handle both data (SHP/CSV) and preview (PNG/PDF/SVG) exports.
- **GUI Simplification**: `ExportManager` in `gui/main_dialog_export.py` now serves as a clean bridge between the UI and the core service.
- **Consolidation**: Removed legacy `exporters/orchestrator.py` and redundant methods in `gui/main_dialog.py`.
- **Bug Fix**: Resolved a `TypeError` in `QgsMapSettings.setOutputSize()` during preview export by improving size handling in `ExportService`.
- **Quality Metrics**: Maintained solid health scores with a quality score of 84.4/100 and average complexity of 19.4.

## PreviewRenderer Fragmentation (Latest)

The `PreviewRenderer` has been completely refactored to reduce its extreme complexity (from 130 to 21.8).

- **Specialized Components**: Extracted logic into four new modular classes:
    - `PreviewOptimizer`: Geometric simplification algorithms.
    - `PreviewLayerFactory`: Layer creation and symbology management.
    - `PreviewAxesManager`: Grid lines and axis labels generation.
    - `PreviewLegendRenderer`: Legend drawing logic.
- **Improved Maintainability**: The orchestrator pattern allows for easier testing and extension of each rendering component.
- **Performance**: The fragmentation has no impact on high-speed rendering (still ~90ms total).

## Architectural Cleanup (Latest)

Resolved architectural violations by separating UI components from the core logic.

- **UI Extraction**: Moved `show_user_message` (which depends on `QMessageBox`) from `core/utils/io.py` to `gui/utils.py`.
- **Pure Core**: `core/utils/io.py` is now free of any PyQt/UI dependencies, satisfying the project's strict layer separation requirements.
- **Improved Testing**: Created `tests/test_gui_utils.py` to specifically test UI alerts and messages.

## Main Dialog Fragmentation (Latest)

The `SecInterpDialog` class has been fragmented to reduce its complexity (from 95 to 18) and improve maintainability.

- **Specialized Managers**: Extracted responsibilities into new modules:
    - **[`main_dialog_settings.py`](file:///home/jmbernales/qgispluginsdev/sec_interp/gui/main_dialog_settings.py)**: Handles `QgsSettings` persistence.
    - **[`main_dialog_status.py`](file:///home/jmbernales/qgispluginsdev/sec_interp/gui/main_dialog_status.py)**: Manages button states and status icons.
    - **[`main_dialog_utils.py`](file:///home/jmbernales/qgispluginsdev/sec_interp/gui/main_dialog_utils.py)**: Centralizes common QGIS entity helpers.
- **Code Reduction**: Removed over 500 lines of redundant and low-level code from `gui/main_dialog.py`.
- **Quality Metrics**: 
    - **Complexity Reduction**: -77 points (from 95 to 18).
    - **Project Quality Score**: Increased to 85.0/100.

- **Bug Fix (Startup Crash)**: Resolved `AttributeError: 'SecInterpDialog' object has no attribute 'buttonBox'` by correcting a typo and missing import in `main_dialog_status.py`.
- **Bug Fix (Missing Indicators)**: Resolved `AttributeError: 'DemPage' object has no attribute 'lbl_raster_status'` by adding missing status labels to `DemPage` and `SectionPage` and ensuring their early initialization.
- **Code Cleanup**: Removed multiple duplicate lines in `main_dialog.py` and `main_window.py` discovered during refactoring.

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*Walkthrough updated on 2025-12-21*

## Preview Refactor (Phase 1)

I have successfully refactored the `PreviewManager` in `gui/main_dialog_preview.py` to reduce its complexity and improve the architectural separation of concerns.

### Changes Made

#### Core Layer
- **[NEW] [preview_service.py](file:///home/jmbernales/qgispluginsdev/sec_interp/core/services/preview_service.py)**: Created a new service that centralizes the logic for generating topography, structures, and drillhole data for the preview.
- **[MOVED] `ParallelGeologyService`**: Moved from `core/services/` to `gui/` to resolve an architectural violation (`UI_IMPORT_IN_CORE`) since it depends on Qt objects (`QThread`, `QObject`).

#### GUI Layer
- **[MODIFIED] [main_dialog_preview.py](file:///home/jmbernales/qgispluginsdev/sec_interp/gui/main_dialog_preview.py)**:
    - Simplified `PreviewManager` to act as a thin coordinator.
    - Replaced ~200 lines of complex data generation logic with a single call to `PreviewService`.
    - Improved parameter collection using a structured `PreviewParams` object.
- **[FIXED] Deprecation Warnings**: Resolved `DeprecationWarning: QgsMapLayerComboBox.setFilters() is deprecated` in several GUI pages by using a backward-compatible approach with `Qgis.LayerFilters`.
- **[FIXED] Startup Crash**: Resolved `AttributeError: 'SecInterp' object has no attribute 'controller'` by reordering initializations in `core/algorithms.py`, ensuring core services are ready before the UI dialog loads.

### Verification Results

#### Quality Metrics Improvement
The project analyzer confirms a significant improvement in the complexity of the GUI layer:

| Metric | Before | After | Change |
| :--- | :--- | :--- | :--- |
| **`main_dialog_preview.py` Complexity** | 104 (CRITICAL) | ~15 | -89 (Huge Improvement) |
| **Average Project Complexity** | 21.6 | 20.9 | -0.7 |
| **Architectural Violations** | 10 | 9 | -1 (Resolved `UI_IMPORT_IN_CORE` in parallel geology) |

> [!TIP]
> By moving the business logic to the core and the Qt-dependent services to the GUI, we've made the codebase much more maintainable and easier to test.

#### Final Verification Result
All layers are now correctly generated and rendered in the preview:
- **Topography**: 430 points
- **Geology**: 9 segments
- **Structures**: 9 measurements
- **Drillholes**: 10 holes/traces

**Performance Metrics**:
- Topography: 8ms
- Structures: 5ms
- Rendering: 52ms
- **Total**: 91ms (Extremely responsive)

## Next Steps
- Modularization of `core/validation.py` (Complexity 70).
- Refactor `exporters/profile_exporters.py` to follow the service pattern.
- Expand `QgsPointLocator` usage for more precise interaction.
