app.py

import os
from typing import TypedDict, Annotated
from langgraph.graph.message import add_messages
from langchain_core.messages import AnyMessage, HumanMessage, AIMessage
from langgraph.prebuilt import ToolNode
from langgraph.graph import START, StateGraph
from langgraph.prebuilt import tools_condition
#from langchain_huggingface import HuggingFaceEndpoint, ChatHuggingFace
#from langchain_google_genai import ChatGoogleGenerativeAI
from langchain_openrouter import ChatOpenRouter
import gradio as gr

from tools import DuckDuckGoSearchRun, weather_info_tool, hub_stats_tool
from retriever import guest_info_tool

#API_KEY = os.environ.get("HF_TOKEN")
#API_KEY = os.environ.get("GOOGLE_API_KEY")
API_KEY = os.environ.get("OPENROUTER_API_KEY")

# Initialize the web search tool
search_tool = DuckDuckGoSearchRun()

# Generate the chat interface, including the tools
#llm = HuggingFaceEndpoint(
#    repo_id="Qwen/Qwen2.5-Coder-32B-Instruct",
#    huggingfacehub_api_token=API_KEY,
#)
#chat = ChatHuggingFace(llm=llm, verbose=True)

#chat = ChatGoogleGenerativeAI(
#    model="gemini-2.0-flash",
#    google_api_key=API_KEY,
#)

chat = ChatOpenRouter(
    model="meta-llama/llama-3.3-70b-instruct:free",
    api_key=API_KEY,
)

tools = [guest_info_tool, search_tool, weather_info_tool, hub_stats_tool]
chat_with_tools = chat.bind_tools(tools)

# Generate the AgentState and Agent graph
class AgentState(TypedDict):
    messages: Annotated[list[AnyMessage], add_messages]

def assistant(state: AgentState):
    return {
        "messages": [chat_with_tools.invoke(state["messages"])],
    }

## The graph
builder = StateGraph(AgentState)

# Define nodes: these do the work
builder.add_node("assistant", assistant)
builder.add_node("tools", ToolNode(tools))

# Define edges: these determine how the control flow moves
builder.add_edge(START, "assistant")
builder.add_conditional_edges(
    "assistant",
    # If the latest message requires a tool, route to tools
    # Otherwise, provide a direct response
    tools_condition,
)
builder.add_edge("tools", "assistant")
alfred = builder.compile()

# Gradio chat function
def chat_with_alfred(message, history):
    messages = [HumanMessage(content=message)]
    result = alfred.invoke({"messages": messages})
    return result["messages"][-1].content

# Gradio UI
demo = gr.ChatInterface(
    fn=chat_with_alfred,
    title="Alfred - Agentic RAG Assistant",
    description="Ask Alfred about gala guests, weather, HuggingFace stats, or anything else!",
)

if __name__ == "__main__":
    demo.launch()

'''
import gradio as gr
import random
from smolagents import GradioUI, CodeAgent, HfApiModel

# Import our custom tools from their modules
from tools import DuckDuckGoSearchTool, WeatherInfoTool, HubStatsTool
from retriever import load_guest_dataset

# Initialize the Hugging Face model
model = HfApiModel()

# Initialize the web search tool
search_tool = DuckDuckGoSearchTool()

# Initialize the weather tool
weather_info_tool = WeatherInfoTool()

# Initialize the Hub stats tool
hub_stats_tool = HubStatsTool()

# Load the guest dataset and initialize the guest info tool
guest_info_tool = load_guest_dataset()

# Create Alfred with all the tools
alfred = CodeAgent(
    tools=[guest_info_tool, weather_info_tool, hub_stats_tool, search_tool], 
    model=model,
    add_base_tools=True,  # Add any additional base tools
    planning_interval=3   # Enable planning every 3 steps
)

if __name__ == "__main__":
    GradioUI(alfred).launch()
'''