import torch
from torch.nn.functional import softmax
from transformers import GPT2Tokenizer
import os
import requests
import tempfile
from flask import Flask, request, jsonify
import gradio as gr

app = Flask(__name__)

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)
        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

@app.route('/check_vulnerabilities', methods=['POST'])
def check_vulnerabilities_api():
    if 'solidity_file_url' not in request.json or 'file_id' not in request.json:
        return jsonify({'error': 'No solidity_file_url or file_id provided'}), 400

    solidity_file_url = request.json['solidity_file_url']
    file_id = request.json['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 jsonify(results)

    except requests.exceptions.RequestException as e:
        return jsonify({'error': f'Error fetching file: {e}'}), 500
    except Exception as e:
        return jsonify({'error': str(e)}), 500

if __name__ == '__main__':
    app.run()