# DigiSim

> Digital logic circuit simulator with Angular frontend, supporting circuit design from basic gates to CPU architecture with real-time simulation.

## Core Components
- **Logic Gates**: AND, OR, NOT, XOR, NAND, NOR, XNOR
- **Sequential**: Flip-flops, Latches, Registers, Counters  
- **Arithmetic**: ALU, Adders, Comparators
- **Memory**: RAM, ROM
- **I/O**: Switches, Lights, Displays, Oscilloscope

## Key Features
- Drag-and-drop circuit builder
- Event-driven simulation engine
- Educational templates
- Subscription-based access (FREE/BASIC/PROFESSIONAL)
- PNG export capabilities

## Architecture
- **Frontend**: Angular 20+, TypeScript, Material Design
- **Backend**: Protobuf APIs
- **Services**: WorkspaceService, ComponentPermissionService, TemplateCircuitService

## APIs
- Auth: `/api/auth/{email,google,apple}/signin`
- Circuits: `/api/digisim/circuits/{save,list,delete}`
- Templates: `/api/digisim/templates/list`
- Subscription: `/api/subscription/status`