app.py

import os
import gradio as gr
import requests
import re
import tempfile
import pandas as pd
from agent import create_agent 
from langchain_core.messages import SystemMessage, HumanMessage 
from tools.download_file import download_file


DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"


with open("system_prompt.txt", "r", encoding="utf-8") as f:
    system = f.read()

system_message = SystemMessage(content=system)

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"


    try:
        agent = create_agent()
        if agent is None:
            return "Failed to create agent. Check console logs for details (e.g., Ollama running?).", None
        print("Agent created successfully.")
    except Exception as e:
        print(f"Unexpected error during agent instantiation: {e}")
        return f"Unexpected 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:
        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:
            # --- Check for associated file ---
            file_path = None
            files_url = f"{api_url}/files/{task_id}"
            try:
                file_response = requests.get(files_url, timeout=10)
                if file_response.status_code == 200:
                    file = response.headers.get("content-disposition", "")
                    match = re.search(r'filename="([^"]+)"', file)
                    if match:
                        filename = match.group(1)

                    #save file to a temporary location
                    with tempfile.NamedTemporaryFile(delete=False) as temp_file:
                        temp_file.write(file_response.content)
                        file_path = temp_file.name

                    file_prompt = "The file needed for this task is downloaded and saved locally to: " + file_path + ".Read this file to process its content."


                    print(f"Task {task_id}: Found associated file")
                elif file_response.status_code == 404:
                    print(f"Task {task_id}: No associated file found.")
                else: 
                    # Log other non-404 errors but don't stop the process
                    print(f"Task {task_id}: Warning - Error checking for file")
            except requests.exceptions.RequestException as file_err:
                print(f"Task {task_id}: Warning - Network error checking for file: {file_err}")

            question_text = question_text + " " + file_prompt if file_path else question_text

            # --- Prepare agent input ---
            agent_input = {
                "messages": [system_message, HumanMessage(content=question_text)]
            }


            # --- Invoke Agent ---
            agent_response = agent.invoke(agent_input)
            answer = agent_response['messages'][-1].content

            # --- Process Answer ---
            match = re.search(r"FINAL ANSWER:.*", answer, flags=re.IGNORECASE)
            answer_line = match.group(0).strip() if match else answer.strip()
            answer_line = answer_line.replace("FINAL ANSWER:", "").strip()  # Clean up the answer
    
            submitted_answer = answer_line # Extract string response

            # response_dict = agent.invoke({"input": question_text})
            # # Extract the answer, handling potential missing key
            # submitted_answer = response_dict.get("output", f"AGENT ERROR: No 'output' key in response: {response_dict}")
            answers_payload.append({"task_id": task_id, "submitted_answer": submitted_answer})
            print(f"Task ID: {task_id}, Question: {question_text}, 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}")
              # Log the error but continue if possible
              results_log.append({"Task ID": task_id, "Question": question_text, "Submitted Answer": f"AGENT ERROR: {e}"})
              # Optionally add a placeholder answer to submit anyway, or skip submission for this task
              # answers_payload.append({"task_id": task_id, "submitted_answer": "AGENT ERROR"})

    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)

    # 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)