app.py

import os
import gradio as gr
import requests
import inspect
import pandas as pd
import re
import time
import base64
#from tavily import TavilyClient
from langchain_tavily import TavilySearch
from langgraph.prebuilt import create_react_agent
from langgraph.graph.message import add_messages
from langgraph_supervisor import create_supervisor
from langchain_google_genai import ChatGoogleGenerativeAI
from langchain_core.tools import tool
from langchain_core.messages import HumanMessage, SystemMessage, BaseMessage
from langchain.chat_models import init_chat_model
from typing import Annotated,Sequence, TypedDict, Literal, Dict

# (Keep Constants as is)
# --- Constants ---
DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"

#ENV
def _set_if_undefined(var: str):
    if not os.environ.get(var):
        os.environ[var] = userdata.get(var)

_set_if_undefined("TAVILY_API_KEY")
_set_if_undefined("GEMINI_API_KEY")
##_set_if_undefined("HUGGINGFACEHUB_API_TOKEN")

TAVILY_API_KEY = os.getenv("TAVILY_API_KEY")
GEMINI_API_KEY = os.getenv("GEMINI_API_KEY")
##HUGGINGFACEHUB_API_TOKEN = os.getenv("HUGGINGFACEHUB_API_TOKEN")

CHESSVISION_TO_FEN_URL = "http://app.chessvision.ai/predict"
CHESS_MOVE_API = "https://chess-api.com/v1"

#PROMPTS
#prompt_recomendado = """You are a general AI assistant. I will ask you a question. Report your thoughts, and finish your answer with the following template:
#                        FINAL ANSWER: [YOUR FINAL ANSWER]. YOUR FINAL ANSWER should be a number OR as few words as possible OR a comma separated list of numbers and/or strings.
#                        If you are asked for a number, don't use comma to write your number neither use units such as $ or percent sign unless specified otherwise.
#                        If you are asked for a string, don't use articles, neither abbreviations (e.g. for cities), and write the digits in plain text unless specified otherwise.
#                        If you are asked for a comma separated list, apply the above rules depending of whether the element to be put in the list is a number or a string."""

prompt_recomendado = """You are a general AI assistant. I will ask you a question. Report your thoughts, and finish your answer with the following template:
                        FINAL ANSWER: [YOUR FINAL ANSWER]. YOUR FINAL ANSWER should be a number OR as few words as possible OR a comma separated list of numbers and/or strings.
                        If you are asked for a number, don't use comma to write your number neither use units such as $ or percent sign unless specified otherwise.
                        If you are asked for a string, don't use articles, neither abbreviations (e.g. for cities), and write the digits in plain text unless specified otherwise.
                        If you are asked for a comma separated list, apply the above rules depending of whether the element to be put in the list is a number or a string.
                        To assist in your task, you can supervise other agents who perform specific tasks that could not be handled by tools, since they require the processing of another LLM. Below, I will inform you about your assistants:
                        - web_research_agent. Assign web research related tasks to this agent, prioritizing the use of Wikipedia sources
                        - chess_position_review_agent. Assign chess position review related tasks to this agent
                        Assign work to one agent at a time, do not call agents in parallel.
                        Priorize the use of tools and another agents to help in reasoning.
                        When a file or URL is entered at the prompt, use it in tools or other agents, both are prepared to handle files and URLs."""

prompt_search = """You are a web research agent.
                   INSTRUCTIONS:
                   Assist ONLY with research-related tasks, DO NOT do any math
                   If a source is provided in the task, you MUST use it as your primary source of information
                   After you're done with your tasks, respond to the supervisor directly
                   Respond ONLY with the results of your work, do NOT include ANY other text."""

prompt_chess = """You are a chess position reviewing agent.
                   INSTRUCTIONS:
                   Assist ONLY with tasks related to chess position reviewing, DO NOT do any math
                   After you're done with your tasks, respond to the supervisor directly
                   Respond ONLY with the results of your work, do NOT include ANY other text."""

#TOOLS
web_search = TavilySearch(
        max_results=5,
        topic="general",
    )

def chess_image_to_fen_tool(task_id:str, current_player: Literal["black", "white"]) -> Dict[str,str]:
    """
        Convert chess image to FEN (Forsyth-Edwards Notation) notation.
        Args:
            image_path: Path to the image file.
            current_player: Whose turn it is to play. Must be either 'black' or 'white'.
        Returns:
            JSON with FEN (Forsyth-Edwards Notation) string representing the current board position.
    """
    print(f"Image to Fen invocada com os seguintes parametros:")
    print(f"task_id: {task_id}")
    print(f"current_player: {current_player}")


    if current_player not in ["black", "white"]:
        raise ValueError("current_player must be 'black' or 'white'")

    base64_image = download_file_as_base64(task_id)
    if not base64_image:
        raise ValueError("Failed to encode image to base64.")
    base64_image_encoded =  f"data:image/jpeg;base64,{base64_image}"
    url = CHESSVISION_TO_FEN_URL
    payload = {
        "board_orientation": "predict",
        "cropped": False,
        "current_player": "black",
        "image": base64_image_encoded,
        "predict_turn": False
    }

    response = requests.post(url, json=payload)
    if response.status_code == 200:
        dados = response.json()
        if dados.get("success"):
            print(f"Retorno Chessvision {dados}")
            fen = dados.get("result")
            fen = fen.replace("_", " ") #retorna _ no lugar de espaço em branco
            return json.dumps({"fen": fen})
        else:
            raise Exception("Requisição feita, mas falhou na predição.")
    else:
        raise Exception(f"Erro na requisição: {response.status_code}")

def chess_fen_get_best_next_move_tool(fen: str, current_player: Literal["black", "white"]) -> str:
    """
        Return the best move in algebraic notation.
        Args:
            fen: FEN (Forsyth-Edwards Notation) notation.
        Returns:
            Best move in algebraic notation.
    """
    if not fen:
        raise ValueError("fen must be provided.")
    if current_player not in ["black", "white"]:
        raise ValueError("current_player must be 'black' or 'white'")


    url = CHESS_MOVE_API
    payload = {
       "fen": fen,
       "depth": 1
    }

    print(f"Buscando melhor jogada em {CHESS_MOVE_API} - {payload}")

    response = requests.post(url, json=payload)
    if response.status_code == 200:
        #print(f"Retorno melhor jogada --> {response.text}")
        dados = response.json()
        move_algebric_notation = dados.get("san")
        move = dados.get("text")
        print(f"Melhor jogada segundo chess-api.com -> {move}")

        return move_algebric_notation

    else:
        raise Exception(f"Erro na requisição: {response.status_code}")

def download_file(task_id: str):
    if not fen:
        raise ValueError("task_id must be provided.")
    # Construct the URL
    url = f"https://agents-course-unit4-scoring.hf.space/files/{task_id}"
    
    # Send the request to download the file
    response = requests.get(url)
    
    if response.status_code == 200:
        # Get the content type from the response headers to determine the file extension
        content_type = response.headers.get('Content-Type', '')
        file_extension = ''
        
        # Map content types to file extensions
        if 'pdf' in content_type:
            file_extension = '.pdf'
        elif 'jpg' in content_type or 'jpeg' in content_type:
            file_extension = '.jpg'
        elif 'png' in content_type:
            file_extension = '.png'
        elif 'txt' in content_type:
            file_extension = '.txt'
        elif 'zip' in content_type:
            file_extension = '.zip'
        elif 'mp3' in content_type:
            file_extension = '.mp3'
        # Add more file types as necessary

        # If the extension can't be determined, default to .bin
        if not file_extension:
            file_extension = '.bin'
        
        # Set the path to the Downloads folder (adjust 'YourUsername' to your actual username)
        save_path = os.path.join(os.path.expanduser('~'), 'Downloads', f"{task_id}_file{file_extension}")
        
        # Save the file with the appropriate extension
        with open(save_path, 'wb') as f:
            f.write(response.content)
        print(f"File successfully downloaded and saved as {save_path}")

        return save_path
    else:
        print(f"Failed to download the file. Status code: {response.status_code}")

def download_file_as_base64(task_id: str) -> str:
    # Construct the URL
    url = f"https://agents-course-unit4-scoring.hf.space/files/{task_id}"
    
    # Send the request to download the file
    response = requests.get(url)
    
    if response.status_code == 200:
        # Encode the content to Base64
        encoded_bytes = base64.b64encode(response.content)
        encoded_str = encoded_bytes.decode('utf-8')  # Convert bytes to string
        return encoded_str
    else:
        raise Exception(f"Failed to download the file. Status code: {response.status_code}")
        


tools = [web_search]

#LLMS
# Create LLM class 
gemini_llm = ChatGoogleGenerativeAI(
    model= "gemini-2.0-flash-exp", # replace with "gemini-2.0-flash"
    temperature=0.0,
    max_tokens=None,
    timeout=None,
    max_retries=2,
    google_api_key=GEMINI_API_KEY,
)
# Bind tools to the model
#general_model = gemini_llm.bind_tools([get_weather_forecast])

#AGENTS
web_research_agent = create_react_agent(
    model=gemini_llm,
    tools=[web_search],
    prompt=prompt_search,
    name="web_research_agent"
)

chess_position_review_agent = create_react_agent(
    model=gemini_llm,
    tools=[chess_image_to_fen_tool,chess_fen_get_best_next_move_tool],
    prompt=prompt_chess,
    name="chess_position_review_agent"
)

supervisor = create_supervisor(
    model=gemini_llm,
    agents=[web_research_agent],
    prompt=prompt_recomendado,
    add_handoff_back_messages=True,
    output_mode="full_history"
).compile()

#final answer
def stream_graph_updates(user_input: str):
    for event in graph.stream({"messages": [{"role": "user", "content": user_input}]}):
        for value in event.values():
            print("Assistant:", value["messages"][-1].content)

# --- Basic Agent Definition ---
# ----- THIS IS WERE YOU CAN BUILD WHAT YOU WANT ------
class BasicAgent:
    def __init__(self):
        print("BasicAgent initialized.")

 #       print("create_react_agent")
 #       agent = create_react_agent(llm, [tavily_search_tool])

#        chat = ChatHuggingFace(llm=llm, verbose=True)
#        tools = [search_web_tool]
#        chat_with_tools = chat.bind_tools(tools)
        
    def __call__(self, question: str, path: str) -> str:
        print(f"Agent received question : {question}...")

        messages = {
                        "messages": [
                            {
                                "role": "user",
                                "content": question
                            }
                        ]
                    }

        events = supervisor.stream(
            messages,
            stream_mode="values",
        )

        listMessages = []
        
        for event in events:
            listMessages.extend(event["messages"])

        print(f"messages: {listMessages}\n")

        answer = listMessages[-1].content
        
        #answer = supervisor.invoke(messages)
        print(f"Answer: {answer}\n")

        start_index = answer.find("FINAL ANSWER: ")
        substring=""
        if start_index != -1:
            substring = answer[start_index+14:] 
        
        final_answer = substring #answer.removeprefix("FINAL ANSWER: ") #re.search(r"FINAL ANSWER:\s*(.*)", answer)
        print(f"Agent returning answer: {final_answer}\n")
        return final_answer

def run_and_submit_all( profile: gr.OAuthProfile | None):
    """
    Fetches all questions, runs the BasicAgent on them, submits all answers,
    and displays the results.
    """
    # --- Determine HF Space Runtime URL and Repo URL ---
    space_id = os.getenv("SPACE_ID") # Get the SPACE_ID for sending link to the code

    if profile:
        username= f"{profile.username}"
        print(f"User logged in: {username}")
    else:
        print("User not logged in.")
        return "Please Login to Hugging Face with the button.", None

    api_url = DEFAULT_API_URL
    questions_url = f"{api_url}/questions"
    submit_url = f"{api_url}/submit"

    # 1. Instantiate Agent ( modify this part to create your agent)
    try:
        agent = BasicAgent()
    except Exception as e:
        print(f"Error instantiating agent: {e}")
        return f"Error initializing agent: {e}", None
    # In the case of an app running as a hugging Face space, this link points toward your codebase ( usefull for others so please keep it public)
    agent_code = f"https://huggingface.co/spaces/{space_id}/tree/main"
    print(agent_code)

    # 2. Fetch Questions
    print(f"Fetching questions from: {questions_url}")
    try:
        response = requests.get(questions_url, timeout=15)
        response.raise_for_status()
        questions_data = response.json()
        if not questions_data:
             print("Fetched questions list is empty.")
             return "Fetched questions list is empty or invalid format.", None
        print(f"Fetched {len(questions_data)} questions.")
    except requests.exceptions.RequestException as e:
        print(f"Error fetching questions: {e}")
        return f"Error fetching questions: {e}", None
    except requests.exceptions.JSONDecodeError as e:
         print(f"Error decoding JSON response from questions endpoint: {e}")
         print(f"Response text: {response.text[:500]}")
         return f"Error decoding server response for questions: {e}", None
    except Exception as e:
        print(f"An unexpected error occurred fetching questions: {e}")
        return f"An unexpected error occurred fetching questions: {e}", None

    # 3. Run your Agent
    results_log = []
    answers_payload = []
    print(f"Running agent on {len(questions_data)} questions...")
    for item in questions_data:
        time.sleep(60)
        task_id = item.get("task_id")
        question_text = item.get("question")
        if not task_id or question_text is None:
            print(f"Skipping item with missing task_id or question: {item}")
            continue
        try:
            submitted_answer = agent(question_text,task_id)
            answers_payload.append({"task_id": task_id, "submitted_answer": submitted_answer})
            results_log.append({"Task ID": task_id, "Question": question_text, "Submitted Answer": submitted_answer})
        except Exception as e:
             print(f"Error running agent on task {task_id}: {e}")
             results_log.append({"Task ID": task_id, "Question": question_text, "Submitted Answer": f"AGENT ERROR: {e}"})

    if not answers_payload:
        print("Agent did not produce any answers to submit.")
        return "Agent did not produce any answers to submit.", pd.DataFrame(results_log)

    # 4. Prepare Submission 
    submission_data = {"username": username.strip(), "agent_code": agent_code, "answers": answers_payload}
    status_update = f"Agent finished. Submitting {len(answers_payload)} answers for user '{username}'..."
    print(status_update)

    final_status = (
        f"Submission Successful!\n"
        f"User: aaaaa\n"
        f"Overall Score: 0% "
        f"(754546 correct)\n"
        f"Message: qwerty"
    )
    results_df = pd.DataFrame(results_log)
    return final_status, results_df

    # 5. Submit
#    print(f"Submitting {len(answers_payload)} answers to: {submit_url}")
#    try:
#        response = requests.post(submit_url, json=submission_data, timeout=60)
#        response.raise_for_status()
#        result_data = response.json()
#        final_status = (
#            f"Submission Successful!\n"
#            f"User: {result_data.get('username')}\n"
#            f"Overall Score: {result_data.get('score', 'N/A')}% "
#            f"({result_data.get('correct_count', '?')}/{result_data.get('total_attempted', '?')} correct)\n"
#            f"Message: {result_data.get('message', 'No message received.')}"
#        )
#        print("Submission successful.")
#        results_df = pd.DataFrame(results_log)
#        return final_status, results_df
#    except requests.exceptions.HTTPError as e:
#        error_detail = f"Server responded with status {e.response.status_code}."
#        try:
#            error_json = e.response.json()
#            error_detail += f" Detail: {error_json.get('detail', e.response.text)}"
#        except requests.exceptions.JSONDecodeError:
#            error_detail += f" Response: {e.response.text[:500]}"
#        status_message = f"Submission Failed: {error_detail}"
#        print(status_message)
#        results_df = pd.DataFrame(results_log)
#        return status_message, results_df
#    except requests.exceptions.Timeout:
#        status_message = "Submission Failed: The request timed out."
#        print(status_message)
#        results_df = pd.DataFrame(results_log)
#        return status_message, results_df
#    except requests.exceptions.RequestException as e:
#        status_message = f"Submission Failed: Network error - {e}"
#        print(status_message)
#        results_df = pd.DataFrame(results_log)
#        return status_message, results_df
#    except Exception as e:
#        status_message = f"An unexpected error occurred during submission: {e}"
#        print(status_message)
#        results_df = pd.DataFrame(results_log)
#        return status_message, results_df



# --- Build Gradio Interface using Blocks ---
with gr.Blocks() as demo:
    gr.Markdown("# Basic Agent Evaluation Runner")
    gr.Markdown(
        """
        **Instructions:**

        1.  Please clone this space, then modify the code to define your agent's logic, the tools, the necessary packages, etc ...
        2.  Log in to your Hugging Face account using the button below. This uses your HF username for submission.
        3.  Click 'Run Evaluation & Submit All Answers' to fetch questions, run your agent, submit answers, and see the score.

        ---
        **Disclaimers:**
        Once clicking on the "submit button, it can take quite some time ( this is the time for the agent to go through all the questions).
        This space provides a basic setup and is intentionally sub-optimal to encourage you to develop your own, more robust solution. For instance for the delay process of the submit button, a solution could be to cache the answers and submit in a seperate action or even to answer the questions in async.
        """
    )

    gr.LoginButton()

    run_button = gr.Button("Run Evaluation & Submit All Answers")

    status_output = gr.Textbox(label="Run Status / Submission Result", lines=5, interactive=False)
    # Removed max_rows=10 from DataFrame constructor
    results_table = gr.DataFrame(label="Questions and Agent Answers", wrap=True)

    run_button.click(
        fn=run_and_submit_all,
        outputs=[status_output, results_table]
    )

if __name__ == "__main__":
    print("\n" + "-"*30 + " App Starting " + "-"*30)
    # Check for SPACE_HOST and SPACE_ID at startup for information
    space_host_startup = os.getenv("SPACE_HOST")
    space_id_startup = os.getenv("SPACE_ID") # Get SPACE_ID at startup

    if space_host_startup:
        print(f"✅ SPACE_HOST found: {space_host_startup}")
        print(f"   Runtime URL should be: https://{space_host_startup}.hf.space")
    else:
        print("ℹ️  SPACE_HOST environment variable not found (running locally?).")

    if space_id_startup: # Print repo URLs if SPACE_ID is found
        print(f"✅ SPACE_ID found: {space_id_startup}")
        print(f"   Repo URL: https://huggingface.co/spaces/{space_id_startup}")
        print(f"   Repo Tree URL: https://huggingface.co/spaces/{space_id_startup}/tree/main")
    else:
        print("ℹ️  SPACE_ID environment variable not found (running locally?). Repo URL cannot be determined.")

    print("-"*(60 + len(" App Starting ")) + "\n")

    print("Launching Gradio Interface for Basic Agent Evaluation...")
    demo.launch(debug=True, share=False)