src/langgraphagenticai/graph/graph_builder.py

from langgraph.graph import StateGraph, START, END, MessagesState
from langgraph.prebuilt import tools_condition, tool_node
from langchain_core.prompts import ChatPromptTemplate
from src.langgraphagenticai.state.state import State
from src.langgraphagenticai.nodes.basic_chatbot_node import BasicChatbotNode

class GraphBuilder:
    def __init__(self, model):
        self.llm = model
        self.graph_builder = StateGraph(State)

    def basic_chatbot_build_graph(self):
        """
        Builds a basic chatbot graph using LangGraph.
        This method initializes a chatbot node using the `BasicChatbotNode` class
        and integrates it into the graph. The chatbot node is set as both the
        entry and exi point of the graph.
        """
        self.basic_chatbot_node = BasicChatbotNode(self.llm)
        self.graph_builder.add_node("chatbot", self.basic_chatbot_node.process)
        self.graph_builder.add_edge(START, "chatbot")
        self.graph_builder.add_edge("chatbot", END)

    def setup_graph(self, usecase: str):
        """
        Sets up the graph for the selected use case.
        """
        if usecase == "Basic Chatbot":
            self.basic_chatbot_build_graph()
        return self.graph_builder.compile()