Development Guide
=================

Welcome to the Nexus development documentation. This guide covers everything you need to know to contribute to and develop with Nexus.

.. toctree::
   :maxdepth: 2
   :caption: Contents:

   contributing
   development_environment
   coding_standards
   architecture_design
   api_design_guidelines
   testing
   code_review_guidelines
   build_system
   porting_guide
   kconfig_guide
   scripts
   debugging_guide
   ci_cd_integration
   coverage_analysis
   static_analysis
   performance_optimization
   security_guidelines
   validation_framework
   script_validation
   documentation_contributing
   release_process
   troubleshooting

Overview
--------

This development guide is organized into several sections:

**Getting Started**

* :doc:`contributing` - How to contribute to Nexus
* :doc:`development_environment` - Setting up your development environment
* :doc:`coding_standards` - Code style and conventions

**Architecture and Design**

* :doc:`architecture_design` - System architecture and design decisions
* :doc:`api_design_guidelines` - API design principles and patterns
* :doc:`porting_guide` - Porting Nexus to new platforms

**Development Workflow**

* :doc:`testing` - Testing strategies and practices
* :doc:`code_review_guidelines` - Code review process and checklist
* :doc:`build_system` - Build system and configuration
* :doc:`kconfig_guide` - Kconfig configuration system

**Tools and Automation**

* :doc:`scripts` - Build scripts and automation tools
* :doc:`debugging_guide` - Debugging techniques and tools
* :doc:`ci_cd_integration` - Continuous integration and deployment

**Quality Assurance**

* :doc:`coverage_analysis` - Code coverage analysis
* :doc:`static_analysis` - Static code analysis
* :doc:`performance_optimization` - Performance tuning
* :doc:`security_guidelines` - Security best practices
* :doc:`validation_framework` - Validation and verification

**Documentation and Release**

* :doc:`documentation_contributing` - Writing documentation
* :doc:`release_process` - Release management
* :doc:`troubleshooting` - Common issues and solutions

Quick Links
-----------

**For New Contributors**

1. Start with :doc:`contributing` to understand the contribution process
2. Set up your environment using :doc:`development_environment`
3. Learn the code style from :doc:`coding_standards`
4. Write tests following :doc:`testing`

**For Maintainers**

* :doc:`code_review_guidelines` - Review checklist
* :doc:`release_process` - Release procedures
* :doc:`ci_cd_integration` - CI/CD configuration

**For Platform Porters**

* :doc:`porting_guide` - Platform porting guide
* :doc:`architecture_design` - Architecture overview
* :doc:`api_design_guidelines` - API design principles

Development Principles
----------------------

Nexus development follows these core principles:

**Quality First**

* Comprehensive testing (1539+ tests)
* High code coverage (target: 100% for native platform)
* Static analysis and MISRA C compliance
* Continuous integration and automated testing

**Developer Experience**

* Clear and consistent APIs
* Comprehensive documentation
* Easy-to-use build tools
* Fast iteration cycles

**Portability**

* Platform abstraction layers
* Minimal platform-specific code
* Consistent behavior across platforms
* Easy porting to new platforms

**Maintainability**

* Clean code architecture
* Consistent coding standards
* Comprehensive documentation
* Regular refactoring

Development Workflow
--------------------

Typical Development Cycle
~~~~~~~~~~~~~~~~~~~~~~~~~~

1. **Plan**: Review requirements and design
2. **Implement**: Write code following standards
3. **Test**: Write and run tests
4. **Review**: Submit for code review
5. **Integrate**: Merge after approval
6. **Validate**: Verify in CI/CD

Feature Development
~~~~~~~~~~~~~~~~~~~

.. code-block:: bash

   # 1. Create feature branch
   git checkout -b feature/my-feature

   # 2. Implement feature
   # - Write code
   # - Add tests
   # - Update documentation

   # 3. Verify locally
   python scripts/building/build.py
   python scripts/test/test.py
   python scripts/tools/format.py

   # 4. Commit changes
   git add .
   git commit -m "feat(module): add new feature"

   # 5. Push and create PR
   git push origin feature/my-feature

Bug Fix Workflow
~~~~~~~~~~~~~~~~

.. code-block:: bash

   # 1. Create bug fix branch
   git checkout -b fix/issue-123

   # 2. Reproduce bug
   # - Write failing test
   # - Verify bug exists

   # 3. Fix bug
   # - Implement fix
   # - Verify test passes

   # 4. Commit and push
   git commit -m "fix(module): fix issue #123"
   git push origin fix/issue-123

Code Quality Standards
----------------------

Testing Requirements
~~~~~~~~~~~~~~~~~~~~

* All new code must have tests
* Minimum 90% code coverage
* All tests must pass before merge
* Property-based tests for HAL implementations

Documentation Requirements
~~~~~~~~~~~~~~~~~~~~~~~~~~

* All public APIs must be documented
* Doxygen comments for all functions
* User guides for new features
* Examples for complex functionality

Code Review Requirements
~~~~~~~~~~~~~~~~~~~~~~~~

* At least one maintainer approval
* All CI checks must pass
* All review comments addressed
* Code follows style guidelines

Tools and Resources
-------------------

Development Tools
~~~~~~~~~~~~~~~~~

* **CMake**: Build system
* **Git**: Version control
* **Python**: Build scripts and tools
* **Doxygen**: API documentation
* **Sphinx**: User documentation
* **clang-format**: Code formatting
* **clang-tidy**: Static analysis

Testing Tools
~~~~~~~~~~~~~

* **Google Test**: Unit testing framework
* **Hypothesis**: Property-based testing (Python)
* **lcov/gcov**: Code coverage
* **Valgrind**: Memory analysis
* **AddressSanitizer**: Memory error detection

Debugging Tools
~~~~~~~~~~~~~~~

* **GDB**: GNU debugger
* **OpenOCD**: On-chip debugger
* **J-Link**: SEGGER debugger
* **ST-Link**: STMicroelectronics debugger

CI/CD Tools
~~~~~~~~~~~

* **GitHub Actions**: Continuous integration
* **Codecov**: Coverage reporting
* **Doxygen**: Documentation generation

Getting Help
------------

If you need help:

* **Documentation**: Read the relevant guide
* **Issues**: Search existing issues on GitHub
* **Discussions**: Ask questions in GitHub Discussions
* **Maintainers**: Contact project maintainers

Contributing
------------

We welcome contributions! See :doc:`contributing` for details on:

* Reporting bugs
* Suggesting features
* Submitting pull requests
* Code review process

Community Guidelines
--------------------

* Be respectful and constructive
* Follow the code of conduct
* Help others learn and grow
* Share knowledge and experience

Next Steps
----------

* :doc:`contributing` - Start contributing
* :doc:`development_environment` - Set up your environment
* :doc:`coding_standards` - Learn the code style
* :doc:`testing` - Write effective tests

See Also
--------

* :doc:`../getting_started/index` - Getting started guide
* :doc:`../user_guide/index` - User guide
* :doc:`../tutorials/index` - Tutorials
* :doc:`../api/index` - API reference