from langgraph.graph import StateGraph,START, END, MessagesState
from langgraph.prebuilt import tools_condition, ToolNode
from langchain_core.prompts import ChatPromptTemplate
from src.langgraph_agenticai.state.state import State
from src.langgraph_agenticai.nodes.basic_chatbot_node import BasicChatbotNode
from src.langgraph_agenticai.nodes.chatbot_with_tools_node import ChatbotWithToolsNode
from src.langgraph_agenticai.nodes.chatbot_ai_news_node import ChatbotAINewsNode
from src.langgraph_agenticai.tools.search_tool import get_tools, create_tool_node

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 chatbot_with_tools_build_graph(self):
         """
        Builds an advanced chatbot graph with tool integration.
        This method creates a chatbot graph that includes both a chatbot node 
        and a tool node. It defines tools, initializes the chatbot with tool 
        capabilities, and sets up conditional and direct edges between nodes. 
        The chatbot node is set as the entry point.
        """
        
         ## Define the tool and tool node
         tools = get_tools()
         tool_node = create_tool_node(tools)
         
         ## Define the LLM
         llm = self.llm
         
         ## Define Chatbot node
         obj_chatbot_with_tools_node = ChatbotWithToolsNode(llm)
         chatbot_node = obj_chatbot_with_tools_node.create_chatbot(tools)
         
         ## Add nodes
         self.graph_builder.add_node("chatbot", chatbot_node)
         self.graph_builder.add_node("tools", tool_node)
         
         ## define conditional and direct edges
         self.graph_builder.add_edge(START,"chatbot")
         self.graph_builder.add_conditional_edges("chatbot", tools_condition)
         self.graph_builder.add_edge("tools", "chatbot")
    
    def chatbot_ai_news_biuld_graph(self):
        """
        Chatbot which provided AI News 
        
        """
        ## Define the tool and tool node
        tools = get_tools()
        tool_node = create_tool_node(tools)
         
        ## Define the LLM
        llm = self.llm
         
        ## Define Chatbot node
        obj_chatbot_ai_news_node = ChatbotAINewsNode(llm)
        chatbot_node = obj_chatbot_ai_news_node.create_ai_new_chatbot(tools)
         
        ## Add nodes
        self.graph_builder.add_node("chatbot", chatbot_node)
        self.graph_builder.add_node("tools", tool_node)
         
        ## define conditional and direct edges
        self.graph_builder.add_edge(START,"chatbot")
        self.graph_builder.add_conditional_edges("chatbot", tools_condition)
        self.graph_builder.add_edge("tools", "chatbot")
         
        
    def setup_graph(self, usecase: str):
        """
        Sets up the graph for the selected use case.
        """
        if usecase == "Basic Chatbot":
            self.basic_chatbot_build_graph()

        if usecase == "Chatbot with Tool":
            self.chatbot_with_tools_build_graph()
            
        if usecase == "AI News":
            self.chatbot_ai_news_biuld_graph()   
            pass 
            
        return self.graph_builder.compile()