use std::{env::temp_dir, fs, future::Future, os::unix::fs::PermissionsExt};

use gpapi::{auth::SamlAuthData, GP_CALLBACK_PORT_FILENAME};
use log::info;
use tokio::{io::AsyncReadExt, net::TcpListener};

use crate::{browser_auth::browser_auth_impl::BrowserAuthenticatorImpl, AuthWindow};

pub trait BrowserAuthenticator {
  fn browser_authenticate(&self, browser: Option<&str>) -> impl Future<Output = anyhow::Result<SamlAuthData>> + Send;
}

impl BrowserAuthenticator for AuthWindow<'_> {
  async fn browser_authenticate(&self, browser: Option<&str>) -> anyhow::Result<SamlAuthData> {
    let auth_request = self.initial_auth_request().await?;
    let browser_auth = if let Some(browser) = browser {
      BrowserAuthenticatorImpl::new_with_browser(&auth_request, browser)
    } else {
      BrowserAuthenticatorImpl::new(&auth_request)
    };

    browser_auth.authenticate()?;
    info!("Please continue the authentication process in the default browser");

    wait_auth_data().await
  }
}

async fn wait_auth_data() -> anyhow::Result<SamlAuthData> {
  // Start a local server to receive the browser authentication data
  let listener = TcpListener::bind("127.0.0.1:0").await?;
  let port = listener.local_addr()?.port();
  let port_file = temp_dir().join(GP_CALLBACK_PORT_FILENAME);

  // Write the port to a file
  fs::write(&port_file, port.to_string())?;
  fs::set_permissions(&port_file, fs::Permissions::from_mode(0o600))?;

  // Remove the previous log file
  let callback_log = temp_dir().join("gpcallback.log");
  let _ = fs::remove_file(&callback_log);

  info!("Listening authentication data on port {}", port);
  info!(
    "If it hangs, please check the logs at `{}` for more information",
    callback_log.display()
  );
  let (mut socket, _) = listener.accept().await?;

  info!("Received the browser authentication data from the socket");
  let mut data = String::new();
  socket.read_to_string(&mut data).await?;

  // Remove the port file
  fs::remove_file(&port_file)?;

  let auth_data = SamlAuthData::from_gpcallback(&data)?;
  Ok(auth_data)
}