# Architecture Overview

This document provides a high-level view of the framework’s components and how they interact, plus a Mermaid diagram for quick orientation.

## Components

- Tests (pytest) — test modules and functions under `tests/`
- Fixtures — defined in `tests/conftest.py` (config, lin, flash_ecu)
- Config Loader — `ecu_framework/config.py` (YAML → dataclasses)
- LIN Abstraction — `ecu_framework/lin/base.py` (`LinInterface`, `LinFrame`)
- Mock LIN Adapter — `ecu_framework/lin/mock.py`
- BabyLIN Adapter — `ecu_framework/lin/babylin.py` (SDK wrapper → BabyLIN_library.py)
- Flasher — `ecu_framework/flashing/hex_flasher.py`
- Reporting Plugin — `conftest_plugin.py` (docstring → report metadata)
- Reports — `reports/report.html`, `reports/junit.xml`

## Mermaid architecture diagram

```mermaid
flowchart TB
  subgraph Tests & Pytest
    T[tests/*]
    CF[tests/conftest.py]
    PL[conftest_plugin.py]
  end

  subgraph Framework
    CFG[ecu_framework/config.py]
    BASE[ecu_framework/lin/base.py]
    MOCK[ecu_framework/lin/mock.py]
    BABY[ecu_framework/lin/babylin.py]
    FLASH[ecu_framework/flashing/hex_flasher.py]
  end

  subgraph Artifacts
    REP[reports/report.html<br/>reports/junit.xml]
  YAML[config/*.yaml<br/>babylin.example.yaml<br/>test_config.yaml]
    SDK[vendor/BabyLIN_library.py<br/>platform-specific libs]
  end

  T --> CF
  CF --> CFG
  CF --> BASE
  CF --> MOCK
  CF --> BABY
  CF --> FLASH
  PL --> REP

  CFG --> YAML
  BABY --> SDK
  T --> REP
```

## Data and control flow summary

- Tests use fixtures to obtain config and a connected LIN adapter
- Config loader reads YAML (or env override), returns typed dataclasses
- LIN calls are routed through the interface abstraction to the selected adapter
- Flasher (optional) uses the same interface to program the ECU
- Reporting plugin parses docstrings and enriches the HTML report

## Extending the architecture

- Add new bus adapters by implementing `LinInterface`
- Add new report sinks (e.g., JSON or a DB) by extending the plugin
- Add new fixtures for diagnostics or measurement tools (Scopes, power supplies, etc.)