import torch
from torch.nn.functional import softmax
from transformers import GPT2Tokenizer
import os
import requests
import tempfile
import gradio as gr

# Model loading and prediction function
def check_vulnerabilities(solidity_file_path, model_directory='models/', device='cuda'):
    device = 'cuda' if torch.cuda.is_available() and device == 'cuda' else 'cpu'
    tokenizer = GPT2Tokenizer.from_pretrained('gpt2')
    tokenizer.pad_token = tokenizer.eos_token

    with open(solidity_file_path, 'r', encoding='utf-8') as f:
        test_code = f.read()

    X = tokenizer([test_code], padding=True, truncation=True, return_tensors="pt")
    dic_name = {
        'reentrancy': 'Reentrancy Vulnerability',
        'timestamp': 'Timestamp Dependency Vulnerability',
        'delegatecall': 'Delegate Call Vulnerability',
        'integeroverflow': 'Integer Overflow Vulnerability',
    }
    
    dic01 = {0: 'The vulnerability does not exist', 1: 'The vulnerability exists'}
    results = {}
    
    for model_name in os.listdir(model_directory):
        vulnerability_name = dic_name[model_name.split('_')[0]]
        cp_file = os.path.join(model_directory, model_name)
        model = torch.load(cp_file, map_location=device)
        X = X.to(device)
        model.to(device)
        model.eval()
        pred = softmax(model(**X).logits, dim=1)[0]
        results[vulnerability_name] = {
            'result': dic01[int(pred.argmax(0))],
            'confidence': pred.max().item()
        }
    
    return results

# Gradio interface function
def check_vulnerabilities_interface(solidity_file_url, file_id):
    model_directory = 'models/'
    device = 'cuda'
    
    try:
        response = requests.get(solidity_file_url)
        response.raise_for_status()

        with tempfile.NamedTemporaryFile(delete=False, suffix=f"_{file_id}.sol") as temp_file:
            temp_file.write(response.content)
            temp_file.flush()
            results = check_vulnerabilities(temp_file.name, model_directory, device)
            os.remove(temp_file.name)
        return results

    except requests.exceptions.RequestException as e:
        return {'error': f'Error fetching file: {e}'}
    except Exception as e:
        return {'error': str(e)}

# Set up the Gradio interface
interface = gr.Interface(
    fn=check_vulnerabilities_interface,
    inputs=[
        gr.components.Textbox(label="Solidity File URL", placeholder="Enter URL here...", lines=2),
        gr.components.Textbox(label="File ID", placeholder="Enter file ID here...", lines=1)
    ],
    outputs=gr.components.JSON(),
    title="Solidity Vulnerability Checker",
    description="Enter the URL of a Solidity file and a file ID to check for vulnerabilities."
)

# Run the interface
if __name__ == "__main__":
    interface.launch(share=True)