# Legacy: Old Package Structure (v0.1.0-rc5)
# Different package organization approaches tested
# Replaced by current flat package structure in v0.2.0

# This file shows the various package structures that were tested
# and why the current flat structure was chosen

"""
OLD STRUCTURE 1: Nested Package Hierarchy
=========================================

echogem/
├── __init__.py
├── core/
│   ├── __init__.py
│   ├── chunker.py
│   ├── vector_store.py
│   └── processor.py
├── models/
│   ├── __init__.py
│   ├── data_models.py
│   └── config.py
├── utils/
│   ├── __init__.py
│   ├── embeddings.py
│   └── cache.py
├── cli/
│   ├── __init__.py
│   └── commands.py
└── visualization/
    ├── __init__.py
    └── graph.py

PROBLEMS:
- Deep imports: from echogem.core.chunker import Chunker
- Complex relative imports: from ..models import Chunk
- Hard to navigate for users
- Over-engineering for a focused library
"""

"""
OLD STRUCTURE 2: Feature-Based Organization
==========================================

echogem/
├── __init__.py
├── chunking/
│   ├── __init__.py
│   ├── semantic_chunker.py
│   ├── text_splitter.py
│   └── chunk_validator.py
├── storage/
│   ├── __init__.py
│   ├── vector_db.py
│   ├── cache_manager.py
│   └── backup.py
├── retrieval/
│   ├── __init__.py
│   ├── similarity_search.py
│   ├── ranking.py
│   └── filters.py
├── llm/
│   ├── __init__.py
│   ├── gemini_client.py
│   ├── prompt_manager.py
│   └── response_parser.py
└── interface/
    ├── __init__.py
    ├── cli.py
    ├── api.py
    └── web_ui.py

PROBLEMS:
- Too many small modules
- Import complexity: from echogem.retrieval.similarity_search import SimilaritySearch
- Hard to understand what each module does
- Over-separation of concerns
"""

"""
OLD STRUCTURE 3: Layer-Based Architecture
=========================================

echogem/
├── __init__.py
├── domain/
│   ├── __init__.py
│   ├── entities.py
│   ├── services.py
│   └── repositories.py
├── infrastructure/
│   ├── __init__.py
│   ├── storage/
│   ├── external_apis/
│   └── config/
├── application/
│   ├── __init__.py
│   ├── use_cases.py
│   ├── commands.py
│   └── queries.py
└── presentation/
    ├── __init__.py
    ├── cli.py
    ├── api.py
    └── views.py

PROBLEMS:
- Enterprise-level complexity
- Hard to understand for casual users
- Over-architecture for a focused tool
- Import paths like: from echogem.application.use_cases import ProcessTranscriptUseCase
"""

"""
OLD STRUCTURE 4: Plugin-Based Architecture
==========================================

echogem/
├── __init__.py
├── core/
│   ├── __init__.py
│   ├── plugin_manager.py
│   └── base_classes.py
├── plugins/
│   ├── __init__.py
│   ├── chunking/
│   ├── storage/
│   ├── retrieval/
│   └── visualization/
├── config/
│   ├── __init__.py
│   ├── plugin_config.py
│   └── settings.py
└── cli.py

PROBLEMS:
- Complex plugin discovery and loading
- Hard to debug plugin issues
- Overkill for a focused library
- Users have to understand plugin system
"""

"""
OLD STRUCTURE 5: Monolithic Single File
======================================

echogem.py  # Single file with everything

PROBLEMS:
- Hard to maintain
- No separation of concerns
- Hard to test individual components
- File becomes too large
"""

"""
CURRENT STRUCTURE: Flat Package
===============================

echogem/
├── __init__.py          # Main package exports
├── chunker.py           # Chunking functionality
├── vector_store.py      # Vector database operations
├── usage_cache.py       # Usage tracking
├── prompt_answer_store.py # Q&A storage
├── processor.py         # Main orchestrator
├── models.py            # Data models
├── graphe.py            # Graph visualization
└── cli.py              # Command-line interface

ADVANTAGES:
- Simple imports: from echogem import Chunker
- Easy to navigate
- Clear module responsibilities
- No complex import paths
- Easy to understand for users
- Simple to maintain and test
"""

# Migration Guide from Old Structures
# ===================================

def migrate_from_nested_structure():
    """Example of migrating from nested structure"""
    # OLD:
    # from echogem.core.chunker import Chunker
    # from echogem.models.data_models import Chunk
    
    # NEW:
    # from echogem import Chunker, Chunk
    pass

def migrate_from_feature_based():
    """Example of migrating from feature-based structure"""
    # OLD:
    # from echogem.retrieval.similarity_search import SimilaritySearch
    # from echogem.storage.vector_db import VectorDB
    
    # NEW:
    # from echogem import ChunkVectorDB  # Similarity search included
    pass

def migrate_from_layer_based():
    """Example of migrating from layer-based structure"""
    # OLD:
    # from echogem.application.use_cases import ProcessTranscriptUseCase
    # from echogem.infrastructure.storage.vector_store import VectorStore
    
    # NEW:
    # from echogem import Processor  # Use case included
    # from echogem import ChunkVectorDB  # Storage included
    pass

# Why Flat Structure Was Chosen
# =============================

REASONS_FOR_FLAT_STRUCTURE = [
    "Simplicity: Easy to understand and navigate",
    "Maintainability: Fewer files to manage",
    "Import clarity: from echogem import Chunker",
    "User experience: No complex import paths",
    "Testing: Easier to test individual components",
    "Documentation: Simpler to document",
    "Deployment: Fewer files to package",
    "Learning curve: Lower barrier to entry"
]

# Future Considerations
# ====================

FUTURE_STRUCTURE_OPTIONS = [
    "Keep flat structure for simplicity",
    "Add subpackages only when truly needed",
    "Consider plugins for major feature additions",
    "Maintain backward compatibility",
    "Document migration paths clearly"
]
