# Architecture of the `ui_repl` Crate

The `ui_repl` crate provides an interactive Read-Eval-Print Loop (REPL) interface for the rhailib ecosystem, enabling real-time script development, testing, and execution with integrated worker management.

## Core Architecture

```mermaid
graph TD
    A[REPL Interface] --> B[Script Execution]
    A --> C[Worker Management]
    A --> D[Client Integration]
    
    B --> B1[Local Engine Execution]
    B --> B2[Remote Worker Execution]
    B --> B3[Script Editing]
    
    C --> C1[Worker Lifecycle]
    C --> C2[Task Distribution]
    C --> C3[Status Monitoring]
    
    D --> D1[Redis Client]
    D --> D2[Task Submission]
    D --> D3[Result Retrieval]
```

## Key Features

### Interactive Development
- **Enhanced Input**: Rustyline for advanced command-line editing
- **Script Editing**: Temporary file editing with external editors
- **Syntax Highlighting**: Enhanced script development experience

### Dual Execution Modes
- **Local Execution**: Direct engine execution for development
- **Remote Execution**: Worker-based execution for production testing
- **Seamless Switching**: Easy mode transitions during development

### Integrated Worker Management
- **Worker Spawning**: Automatic worker process management
- **Lifecycle Control**: Start, stop, and restart worker processes
- **Status Monitoring**: Real-time worker health and performance

## Dependencies

- **Rhai Client**: Integration with rhailib client for remote execution
- **Rhailib Engine**: Direct engine access for local execution
- **Rhailib Worker**: Embedded worker management capabilities
- **Enhanced CLI**: Rustyline for superior REPL experience
- **Async Runtime**: Tokio for concurrent operations

## Usage Patterns

The REPL serves as the primary development interface for rhailib, providing developers with immediate feedback and testing capabilities for Rhai scripts and business logic.