import gradio as gr
import google.generativeai as genai
import paramiko
import io

def fetch_github_file(github_url, ssh_private_key):
    try:
        # Parse the GitHub URL
        parts = github_url.split('/')
        owner = parts[3]
        repo = parts[4]
        branch = parts[6]
        file_path = '/'.join(parts[7:])

        # Set up SSH client
        ssh = paramiko.SSHClient()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

        # Load the private key
        private_key = paramiko.RSAKey.from_private_key(io.StringIO(ssh_private_key))

        # Connect to GitHub using SSH
        ssh.connect('github.com', username='git', pkey=private_key)

        # Construct the git command to fetch the file content
        git_command = f"git archive --remote=git@github.com:{owner}/{repo}.git {branch} {file_path} | tar -xO"

        # Execute the command
        stdin, stdout, stderr = ssh.exec_command(git_command)
        
        # Read the file content
        file_content = stdout.read().decode('utf-8')

        # Close the SSH connection
        ssh.close()

        if not file_content:
            return {"error": "Error: File not found or empty."}

        return {file_path: file_content}
    except paramiko.AuthenticationException:
        return {"error": "Error: Authentication failed. Please check your SSH key."}
    except paramiko.SSHException as ssh_err:
        return {"error": f"SSH Error: {str(ssh_err)}"}
    except Exception as e:
        return {"error": f"Error accessing GitHub: {str(e)}"}

def process_with_gemini(file_content, gemini_api_key):
    genai.configure(api_key=gemini_api_key)
    model = genai.GenerativeModel('gemini-2.5-pro-preview-03-25')
    
    combined_content = "\n\n".join([f"File: {name}\n{content}" for name, content in file_content.items()])
    
    prompt = f"""
    Analyze the following file content for open-source license information:

    {combined_content}

    Please provide:
    1. A list of dependencies and their versions
    2. The licenses associated with each dependency (if available)
    3. A summary of the project based on these dependencies
    4. Any potential license conflicts or considerations
    5. Suggestions for best practices in open-source license management for this project
    """

    response = model.generate_content(prompt)
    return response.text

def process_input(file, github_url, ssh_private_key, gemini_api_key):
    if file is not None and github_url:
        return "Error: Please either upload a file OR provide a GitHub URL, not both."
    
    if file is not None:
        file_content = {file.name: file.read().decode('utf-8')}
    elif github_url and ssh_private_key:
        if not github_url.startswith("https://github.com/"):
            return "Error: Invalid GitHub URL. Please use the format: https://github.com/username/repository/blob/branch/path/to/file"
        if not ssh_private_key.strip():
            return "Error: SSH Private Key is empty. Please provide a valid key."
        file_content = fetch_github_file(github_url, ssh_private_key)
        if isinstance(file_content, dict) and "error" in file_content:
            return file_content["error"]
    else:
        return "Error: Please either upload a file OR provide both GitHub URL and SSH Private Key."
    
    try:
        # Process the file content with Gemini
        analysis = process_with_gemini(file_content, gemini_api_key)
        return analysis
    except Exception as e:
        return f"Error processing the file: {str(e)}"

iface = gr.Interface(
    fn=process_input,
    inputs=[
        gr.File(label="Upload dependency file (e.g., requirements.txt, package.json, Gemfile)"),
        gr.Textbox(label="GitHub File URL (optional)"),
        gr.TextArea(label="SSH Private Key (required if using GitHub URL)", lines=10),
        gr.Textbox(label="Gemini API Key", type="password"),
    ],
    outputs=gr.Textbox(label="License Information and Analysis"),
    title="Open Source License Extractor",
    description="Upload a dependency file or provide a GitHub repository URL to analyze open-source licenses.",
)

if __name__ == "__main__":
    iface.launch()