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#![feature(async_closure)]
use reqwest::{header::*, Client, ClientBuilder};

static mut TOKEN: Option<String> = None;

pub fn gh_client(token: Option<&str>) -> ClientBuilder {
  let mut default_headers = HeaderMap::new();

  if let Some(token) = token.or(get_token()) {
    default_headers.insert(
      AUTHORIZATION,
      HeaderValue::from_str(&format!("Bearer {}", token)).unwrap(),
    );
  }

  default_headers.insert(
    "Accept",
    HeaderValue::from_static("application/vnd.github.v3+json"),
  );
  default_headers.insert(USER_AGENT, HeaderValue::from_str("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.104 Safari/537.36").unwrap());

  Client::builder().default_headers(default_headers)
}

pub fn get_token() -> Option<&'static str> {
  unsafe { TOKEN.as_ref().map(|token| &token[..]) }
}

pub fn set_token<T: ToString>(token: Option<T>) {
  unsafe { TOKEN = token.map(|token| token.to_string()) };
}

#[macro_export]
macro_rules! gh_api_get {
  ($fmt:literal$(, $($arg:tt)*)?) => {
    $crate::gh_api_get!($crate::gh_client(None).build().unwrap(), $fmt$(, $($arg)*)?)
  };

  ($client:expr, $fmt:literal$(, $($arg:tt)*)?) => {
    $crate::gh_get!($client, "https://api.github.com/{}", format!($fmt$(, $($arg)*)?))
  };
}

#[macro_export]
macro_rules! gh_get {
  ($fmt:literal$(, $($arg:tt)*)?) => {
    $crate::gh_get!($crate::gh_client(None).build().unwrap(), $fmt$(, $($arg)*)?)
  };

  ($client:expr, $fmt:literal$(, $($arg:tt)*)?) => {
    $client.get(&format!($fmt$(, $($arg)*)?))
  };
}