from langchain.agents import AgentExecutor, create_openai_tools_agent
from langchain_core.messages import BaseMessage, HumanMessage, SystemMessage, AIMessage
from langchain_openai import ChatOpenAI

from langchain_huggingface import ChatHuggingFace
from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder

def create_agent(llm: ChatHuggingFace, tools: list, system_prompt: str):
    # Each worker node will be given a name and some tools.
    prompt = ChatPromptTemplate.from_messages(
        [
            (
                "human",
                system_prompt,
            ),
            ("assistant", "ok" ),
            MessagesPlaceholder(variable_name="messages"),
            MessagesPlaceholder(variable_name="agent_scratchpad"),
        ]
    )
    agent = create_openai_tools_agent(llm, tools, prompt)
    executor = AgentExecutor(agent=agent, tools=tools)
    return executor