# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

This is a Korean Enterprise GroupWare system built with C# .NET Framework 4.6 and Windows Forms. The application serves as a comprehensive business management system that includes project management, purchasing, attendance tracking, reporting, and web-based functionality. The project runs on port 7979 (previously 9000) and includes both desktop and web components.

## Architecture

### Main Application (Project/EETGW.csproj)
- **Entry Point**: `Project/Program.cs` - Handles WebView2Runtime extraction and starts the main form
- **Main Form**: `Project/fMain.cs` - Primary application window
- **Web Server**: Integrated OWIN-based web server for HTTP API and static files
- **Database**: Microsoft SQL Server with Entity Framework 6.2.0
- **Target Framework**: .NET Framework 4.6

### Key Components

1. **Web Layer** (`Project/Web/`):
   - **Startup.cs**: OWIN configuration for HTTP API and static file serving
   - **Controllers**: API controllers for various business functions (Home, Project, Purchase, Item, etc.)
   - **wwwroot**: Static web assets (HTML, CSS, JS files)

2. **SubProjects**: Modular components with specific business functionality:
   - **FPJ0000**: Project management module
   - **FCM0000**: Customer management
   - **FEQ0000**: Equipment management  
   - **FBS0000**: Holiday/attendance management
   - **FCOMMON**: Shared common functionality
   - **WebServer**: Additional web services
   - **AmkorRestfulService**: REST API services

3. **Sub Components** (`Sub/`):
   - **arCtl**: Custom controls library
   - **arftp**: FTP functionality
   - **tcpservice**: TCP communication services
   - **YARTE**: HTML editor component
   - **StaffLayoutCtl**: Staff layout controls

### Technology Stack
- **UI Framework**: Windows Forms with custom controls (FarPoint Spread grids)
- **Web Framework**: OWIN with ASP.NET Web API 5.2.9
- **Database ORM**: Entity Framework 6.2.0
- **JSON Processing**: Newtonsoft.Json 13.0.3
- **Web Browser**: Microsoft WebView2 1.0.2210.55
- **Reports**: Microsoft ReportViewer 15.0
- **Excel Processing**: libxl.net and CsvHelper 30.0.1

## Development Commands

### Building the Solution
```bash
# Build the entire solution
msbuild EETGW.sln /p:Configuration=Debug /p:Platform="Any CPU"

# Build for release
msbuild EETGW.sln /p:Configuration=Release /p:Platform="Any CPU"

# Build specific project
msbuild Project/EETGW.csproj /p:Configuration=Debug
```

### Running the Application
- **Debug Mode**: Run from Visual Studio or build and execute the output from `Project/bin/Debug/`
- **Web Server**: Automatically starts on port 7979 when the application launches
- **Database**: Ensure SQL Server connection string is configured in app.config

### Package Management
- Uses NuGet packages defined in `packages.config` files throughout the solution
- Restore packages using: `nuget restore EETGW.sln`

## Configuration

### Database Connection
- Connection strings configured in individual `app.config` files
- Primary database connection in `Project/app.config`
- Uses Entity Framework with SQL Server

### Web Server Configuration
- **Port**: 7979 (configured in startup)
- **Static Files**: Served from `Project/Web/wwwroot/`
- **API Routes**: Configured in `Project/Web/Startup.cs`
- **CORS**: Enabled for all origins

### Build Configurations
- **Debug**: Outputs to `Project/bin/Debug/` with x86 platform target
- **Release**: Optimized build configuration
- Different output paths for various configurations (see EETGW.csproj)

## Key Conventions

### Code Organization
- Korean comments and variable names are common throughout the codebase
- Business logic separated into modular SubProjects
- Shared functionality centralized in FCOMMON project
- Custom controls and utilities in Sub/ directory

### File Structure
- Each SubProject has its own namespace and assembly
- Form files follow naming convention: `f[FormName].cs` with corresponding `.Designer.cs` and `.resx`
- Dataset files use `.xsd` schemas with generated code

### Dependencies
- Heavy use of FarPoint Spread controls for data grids
- Custom logging via ArLog.Net4.dll
- Settings management through ArSetting.Net4.dll
- Multiple third-party libraries for Excel, FTP, and web functionality

## Development Notes

- WebView2Runtime is automatically extracted on first run from WebView2Runtime.zip
- The application includes comprehensive error handling and logging
- Multiple authentication methods including AD integration
- Supports both Korean and English localization
- Includes extensive reporting capabilities with RDLC files