import pandas as pd
import matplotlib.pyplot as plt
import io
import base64
from smolagents import tool

@tool
def visualize_csv(csv_content: str, x_col: str, y_col: str) -> str:
    """
    Generates a plot from CSV content.
    Args:
        csv_content: The raw CSV file content as a string.
        x_col: The name of the column for the x-axis.
        y_col: The name of the column for the y-axis.
    Returns:
        A base64-encoded image tag of the generated plot.
    """
    try:
        df = pd.read_csv(io.StringIO(csv_content))
        plt.figure(figsize=(8, 5))
        plt.plot(df[x_col], df[y_col])
        plt.xlabel(x_col)
        plt.ylabel(y_col)
        plt.title(f"{y_col} vs {x_col}")
        
        buf = io.BytesIO()
        plt.savefig(buf, format='png')
        buf.seek(0)
        img_base64 = base64.b64encode(buf.read()).decode('utf-8')
        plt.close()
        return f'<img src="data:image/png;base64,{img_base64}" />'
    except Exception as e:
        return f"Error: {str(e)}"