# Source Tree Analysis - Main

This document provides an annotated overview of the project's source code structure, focusing on the `internal/` directory which contains the core application logic.

```
internal/
├── app/                  # Application Layer: Handles HTTP requests, DTOs, and orchestrates services.
│   ├── api/              # API Definitions and Routing (Echo framework).
│   ├── controller/       # Request Handlers for various domains (User, Device, Plan, Pig Farm, Monitor).
│   │   ├── device/       # Device-related API controllers.
│   │   ├── management/   # Management-related API controllers (e.g., Pig Batch).
│   │   ├── monitor/      # Monitoring-related API controllers.
│   │   ├── plan/         # Plan-related API controllers.
│   │   └── user/         # User-related API controllers.
│   ├── dto/              # Data Transfer Objects: Request/response models for API.
│   ├── middleware/       # HTTP Middleware (e.g., authentication, audit logging).
│   ├── service/          # Application Services: Business logic orchestration.
│   └── webhook/          # Webhook handlers (e.g., ChirpStack).
├── core/                 # Core Application Components: Initialization and data setup.
│   ├── application.go    # Main application setup.
│   ├── component_initializers.go # Initializes various application components.
│   └── data_initializer.go # Initializes core data.
├── domain/               # Domain Layer: Business logic and entities.
│   ├── audit/            # Audit-related domain services.
│   ├── device/           # Device-related domain services.
│   ├── notify/           # Notification domain services.
│   ├── pig/              # Pig and Pig Batch related domain services.
│   ├── scheduler/        # Scheduling domain services.
│   ├── task/             # Task-related domain services.
│   └── token/            # Token management domain services.
└── infra/                # Infrastructure Layer: External concerns (DB, logging, config, external APIs).
    ├── config/           # Configuration management.
    ├── database/         # Database connection and ORM setup (PostgreSQL, SQLite).
    ├── logs/             # Logging utilities.
    ├── models/           # GORM Models (Database schema definitions).
    ├── notify/           # Notification implementations (Lark, SMTP, WeChat).
    ├── repository/       # Data Repositories: Database interaction logic.
    ├── transport/        # External Communication (e.g., LoRaWAN ChirpStack).
    │   ├── lora/         # LoRaWAN specific transport.
    │   └── proto/        # Protocol buffer definitions.
    └── utils/            # General utilities.
```