import os
import gradio as gr
import requests
import pandas as pd

import google.generativeai as genai
from smolagents import CodeAgent, DuckDuckGoSearchTool
from smolagents.models.base import BaseModel

# Define the system prompt
SYSTEM_PROMPT = """You are a general AI assistant. I will ask you a question.
Report your thoughts, and finish your answer with just the answer — no prefixes like "FINAL ANSWER:".
Your answer should be a number OR as few words as possible OR a comma-separated list of numbers and/or strings.
If you're asked for a number, don’t use commas or units like $ or %, unless specified.
If you're asked for a string, don’t use articles or abbreviations (e.g. for cities), and write digits in plain text unless told otherwise."""

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

# Gemini model wrapper
class GeminiFlashModel(BaseModel):
    def __init__(self, model_name="gemini-1.5-flash", api_key=None):
        self.model_name = model_name
        self.api_key = api_key or os.getenv("GOOGLE_API_KEY")
        if not self.api_key:
            raise ValueError("GOOGLE_API_KEY is not set in environment variables.")
        genai.configure(api_key=self.api_key)
        self.model = genai.GenerativeModel(model_name)

    def generate(self, messages, stop_sequences=None, **kwargs):
        # Insert system prompt if missing
        if isinstance(messages, list):
            if not any(m["role"] == "system" for m in messages):
                messages = [{"role": "system", "content": SYSTEM_PROMPT}] + messages
        else:
            raise TypeError("Expected 'messages' to be a list of message dicts")

        # Convert messages to a single string (Gemini expects plain prompt)
        prompt = "\n".join([f"{m['role'].capitalize()}: {m['content']}" for m in messages])

        try:
            response = self.model.generate_content(prompt)
            return response.text.strip()
        except Exception as e:
            return f"GENERATION ERROR: {e}"

# Agent using Gemini-1.5-flash
class MyAgent:
    def __init__(self):
        self.model = GeminiFlashModel(model_name="gemini-1.5-flash")
        self.agent = CodeAgent(tools=[DuckDuckGoSearchTool()], model=self.model)

    def __call__(self, question: str) -> str:
        return self.agent.run(question)

# Evaluation & submission flow
def run_and_submit_all(profile: gr.OAuthProfile | None):
    space_id = os.getenv("SPACE_ID")

    if profile:
        username = 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 = MyAgent()
    except Exception as e:
        return f"Error initializing agent: {e}", None

    agent_code = f"https://huggingface.co/spaces/{space_id}/tree/main"
    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:
            return "Fetched questions list is empty or invalid format.", None
        print(f"Fetched {len(questions_data)} questions.")
    except Exception as e:
        return f"Error fetching questions: {e}", None

    results_log = []
    answers_payload = []
    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:
            continue
        try:
            submitted_answer = agent(question_text)
            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:
            error_msg = f"AGENT ERROR: {e}"
            results_log.append({"Task ID": task_id, "Question": question_text, "Submitted Answer": error_msg})

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

    submission_data = {
        "username": username.strip(),
        "agent_code": agent_code,
        "answers": answers_payload
    }

    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.')}"
        )
        results_df = pd.DataFrame(results_log)
        return final_status, results_df
    except requests.exceptions.HTTPError as e:
        try:
            detail = e.response.json().get("detail", e.response.text)
        except Exception:
            detail = e.response.text[:500]
        return f"Submission Failed: {detail}", pd.DataFrame(results_log)
    except requests.exceptions.Timeout:
        return "Submission Failed: The request timed out.", pd.DataFrame(results_log)
    except Exception as e:
        return f"An unexpected error occurred during submission: {e}", pd.DataFrame(results_log)

# Gradio UI
with gr.Blocks() as demo:
    gr.Markdown("# Basic Agent Evaluation Runner")
    gr.Markdown("""
    **Instructions:**
    1. Clone this space and modify it to define your agent's logic.
    2. Log in with Hugging Face.
    3. Click 'Run Evaluation & Submit All Answers' to run and submit.
    """)

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

    status_output = gr.Textbox(label="Run Status / Submission Result", lines=5, interactive=False)
    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" + "="*10 + " App Startup " + "="*10)
    space_host = os.getenv("SPACE_HOST")
    space_id = os.getenv("SPACE_ID")

    if space_host:
        print(f"✅ SPACE_HOST: {space_host} -> https://{space_host}.hf.space")
    else:
        print("ℹ️  SPACE_HOST not set.")

    if space_id:
        print(f"✅ SPACE_ID: {space_id}")
    else:
        print("ℹ️  SPACE_ID not set.")

    demo.launch(debug=True, share=False)