# gangalatanishka-04/ai-chatbot architecture

> Architecture diagram of the GitHub repository gangalatanishka-04/ai-chatbot, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-08-02). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/gangalatanishka-04/ai-chatbot
- Repository: https://github.com/gangalatanishka-04/ai-chatbot

## Overview

#### Purpose and Entry Point
This is a small Python conversational chatbot exposed as a Gradio web UI. Its executable entry point is `app.py`; running `python app.py` starts the local service. Deployment targets include Hugging Face Spaces.

#### Application Composition
- **Application/UI host:** `app.py` defines the chatbot behavior and Gradio interface.
- **Dependency boundary:** `requirements.txt` supplies the Python runtime packages, notably Gradio and HTTP client support.
- **Product documentation and deployment instructions:** `README.md`.
- **Static visual assets:** `images/` contains UI screenshots/documentation imagery rather than a separate frontend bundle.

#### Request and Response Flow
1. A user submits a message through the Gradio chat interface in `app.py`.
2. The application combines the new message with short-term conversation history maintained for the session.
3. `app.py` sends the resulting chat request to the OpenRouter API using an HTTP request.
4. The OpenRouter model response is returned to the Gradio callback.
5. The UI renders the assistant reply and retains it as context for subsequent turns.

#### Conversation-State Boundary
Conversation context is intentionally short-term and application-managed rather than persisted in a database. The core state and prompt/message assembly belong in `app.py`; there is no indicated durable history store, authentication layer, or separate backend service.

#### External Services and Secrets
- **OpenRouter API:** external LLM gateway used for inference; network/API failure behavior is a material integration concern. Integration is implemented from `app.py`.
- **API credential:** supplied through the `OPENROUTER_API_KEY` environment variable, keeping secrets out of source control.
- **Hugging Face Spaces:** supported deployment runtime, with `app.py` serving as the Space application entry point.

#### Runtime and Infrastructure
The repository is a single-process Python application with no build pipeline, database, message queue, or standalone frontend. Gradio provides both request handling and browser-facing UI; `requirements.txt` defines the deployable dependency set. `images/` is non-runtime supporting content.

Main entry points: [`app.py`](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py) (Gradio Chat App), [`README.md`](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/README.md) (Documentation), [`requirements.txt`](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/requirements.txt) (Python Dependencies)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_runtime["Python Application"]
  node_app["Gradio Chat App<br/>Python entry point<br/>[app.py]"]
  node_chat_ui["Chat Interface<br/>Gradio UI<br/>[app.py]"]
  node_session_history["Short-Term History<br/>session state<br/>[app.py]"]
  node_prompt_request["Chat Request Assembly<br/>prompt builder<br/>[app.py]"]
  node_openrouter_client["OpenRouter HTTP Client<br/>API integration<br/>[app.py]"]
end

subgraph group_external["External Services"]
  node_openrouter{{"OpenRouter API<br/>LLM gateway"}}
  node_hf_spaces["Hugging Face Spaces<br/>deployment runtime"]
end

node_user(("User<br/>actor"))
node_requirements["Python Dependencies<br/>dependency manifest<br/>[requirements.txt]"]
node_api_key{{"OPENROUTER_API_KEY<br/>environment secret"}}
node_readme["Documentation<br/>README<br/>[README.md]"]
node_images["Static Images<br/>documentation assets"]

node_user -->|"submits message"| node_chat_ui
node_chat_ui -->|"invokes callback"| node_app
node_app -->|"reads and updates"| node_session_history
node_session_history -->|"supplies prior turns"| node_prompt_request
node_app -->|"adds new message"| node_prompt_request
node_prompt_request -->|"chat payload"| node_openrouter_client
node_api_key -.->|"authenticates"| node_openrouter_client
node_openrouter_client -->|"HTTP inference request"| node_openrouter
node_openrouter -->|"model response or error"| node_openrouter_client
node_openrouter_client -->|"assistant reply"| node_app
node_app -->|"renders reply"| node_chat_ui
node_requirements -.->|"provides runtime packages"| node_app
node_hf_spaces -.->|"hosts entry point"| node_app
node_readme -.->|"documents deployment"| node_hf_spaces
node_images -.->|"supports documentation"| node_readme

click node_app "https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py"
click node_chat_ui "https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py"
click node_session_history "https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py"
click node_prompt_request "https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py"
click node_openrouter_client "https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py"
click node_requirements "https://github.com/gangalatanishka-04/ai-chatbot/blob/main/requirements.txt"
click node_readme "https://github.com/gangalatanishka-04/ai-chatbot/blob/main/README.md"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_app,node_chat_ui,node_session_history,node_prompt_request,node_openrouter_client toneBlue
class node_openrouter,node_hf_spaces toneAmber
class node_user,node_requirements,node_api_key,node_readme,node_images toneNeutral
```

## Components

### Python Application

Single-process Gradio chatbot runtime.

- [Gradio Chat App](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py): Python entry point · Hosts the UI, callback, prompt assembly, and API integration. · `app.py`
- [Chat Interface](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py): Gradio UI · `app.py`
- [Short-Term History](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py): session state · Application-managed, non-persistent conversation context. · `app.py`
- [Chat Request Assembly](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py): prompt builder · `app.py`
- [OpenRouter HTTP Client](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/app.py): API integration · Handles inference requests and network/API failures. · `app.py`

### External Services

- **OpenRouter API**: LLM gateway
- **Hugging Face Spaces**: deployment runtime · Supported hosting environment for the application entry point.

### Other components

- **User**: actor
- [Python Dependencies](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/requirements.txt): dependency manifest · Supplies Gradio and HTTP client packages. · `requirements.txt`
- **OPENROUTER_API_KEY**: environment secret · Credential supplied outside source control.
- [Documentation](https://github.com/gangalatanishka-04/ai-chatbot/blob/main/README.md): README · Usage and deployment instructions. · `README.md`
- **Static Images**: documentation assets · Non-runtime screenshots and visual content.

## Connections

- User → Chat Interface: submits message
- Chat Interface → Gradio Chat App: invokes callback
- Gradio Chat App → Short-Term History: reads and updates
- Short-Term History → Chat Request Assembly: supplies prior turns
- Gradio Chat App → Chat Request Assembly: adds new message
- Chat Request Assembly → OpenRouter HTTP Client: chat payload
- OPENROUTER_API_KEY → OpenRouter HTTP Client: authenticates
- OpenRouter HTTP Client → OpenRouter API: HTTP inference request
- OpenRouter API → OpenRouter HTTP Client: model response or error
- OpenRouter HTTP Client → Gradio Chat App: assistant reply
- Gradio Chat App → Chat Interface: renders reply
- Python Dependencies → Gradio Chat App: provides runtime packages
- Hugging Face Spaces → Gradio Chat App: hosts entry point
- Documentation → Hugging Face Spaces: documents deployment
- Static Images → Documentation: supports documentation