added graph builder

src/langgraphagenticai/graph/graph_builder.py

@@ -0,0 +1,38 @@
+from langgraph.graph import StateGraph, START,END, MessagesState
+from langgraph.prebuilt import tools_condition,ToolNode
+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 exit 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()
+
+
+
+