#![allow(dead_code)]

extern crate serde;
extern crate serde_json;
#[macro_use]
extern crate serde_derive;
extern crate time;
extern crate log;
extern crate smpl_jwt;
extern crate reqwest;
extern crate futures;

pub mod error;
pub mod auth;
pub mod scopes;
pub mod credentials;

use error::GOErr;
use auth::{Token, JwtClaims};
use credentials::Credentials;

use std::str::FromStr;
use smpl_jwt::Jwt;
use reqwest::Client;
use reqwest::async::Client as aClient;
use futures::future::Future;

const DEFAULT_URL: &str = "https://www.googleapis.com/oauth2/v4/token";

fn form_body(body: &str) -> Vec<(&str, &str)> {
    vec!(("grant_type", "urn:ietf:params:oauth:grant-type:jwt-bearer"), ("assertion", body))
}

/// Get Token which can be used to authenticate further request
/// ### Example
///
/// ```
/// extern crate smpl_jwt;
/// extern crate goauth;
/// #[macro_use]
/// extern crate log;
///
/// use goauth::auth::JwtClaims;
/// use goauth::scopes::Scope;
/// use goauth::get_token_legacy;
/// use smpl_jwt::{RSAKey, Jwt};
///
/// fn main() {
///   let token_url = "https://www.googleapis.com/oauth2/v4/token";
///   let iss = "some_iss"; // https://developers.google.com/identity/protocols/OAuth2ServiceAccount
///   let private_key_file = "random_rsa_for_testing";
///
///   let claims = JwtClaims::new(String::from(iss),
///                              &Scope::DevStorageReadWrite,
///                              String::from(token_url),
///                              None, None);
///   let key = match RSAKey::from_pem(private_key_file) {
///     Ok(x) => x,
///     Err(e) => panic!("{}", e)
///   };
///   let jwt = Jwt::new(claims, key, None);
///   match get_token_legacy(&jwt, None) {
///     Ok(x) => debug!("{}", x),
///     Err(e) => debug!("{}", e)
///   };
/// }
///
/// ```
pub fn get_token_legacy(jwt: &Jwt<JwtClaims>, url: Option<&str>) -> Result<Token, GOErr> {
    let client = Client::new();
    let final_jwt = jwt.finalize()?;
    let request_body = form_body(&final_jwt);
    let mut response = client.post(url.unwrap_or(DEFAULT_URL))
        .form(&request_body).send()?;

    Token::from_str(&response.text()?)
}

pub fn get_token_as_string_legacy(jwt: &Jwt<JwtClaims>, url: Option<&str>) -> Result<String, GOErr> {
    Ok(serde_json::to_string(&get_token_legacy(jwt, url)?)?)
}

pub fn get_token_as_string(jwt: &Jwt<JwtClaims>, credentials: &Credentials) -> Result<String, GOErr> {
    Ok(serde_json::to_string(&get_token_with_creds(jwt, credentials)?)?)
}

#[test]
fn test_jwt_encode() {
    use auth::JwtClaims;
    use smpl_jwt::{RSAKey, Jwt};
    use scopes::Scope;

    let token_url = "https://www.googleapis.com/oauth2/v4/token";
    let iss = "some_iss"; // https://developers.google.com/identity/protocols/OAuth2ServiceAccount
    let private_key_file = "random_rsa_for_testing";


    let claims = JwtClaims::new(String::from(iss),
                                &Scope::DevStorageReadWrite,
                                String::from(token_url),
                                Some(1482317385), Some(3600));
    let key = match RSAKey::from_pem(private_key_file) {
        Ok(x) => x,
        Err(e) => panic!("{}", e)
    };
    let jwt = Jwt::new(claims, key, None);
    assert_eq!(jwt.finalize().unwrap(), "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzb21lX2lzcyIsInNjb3BlIjoiaHR0cHM6Ly93d3cuZ29vZ2xlYXBpcy5jb20vYXV0aC9kZXZzdG9yYWdlLnJlYWRfd3JpdGUiLCJhdWQiOiJodHRwczovL3d3dy5nb29nbGVhcGlzLmNvbS9vYXV0aDIvdjQvdG9rZW4iLCJleHAiOjE0ODIzMjA5ODUsImlhdCI6MTQ4MjMxNzM4NX0=.BldQozpzNYnLnYWBbqwAWY1j2hPDD3oVY9EOG0eRJN77sC4ZInEyGJT5eXLD39C726TdrEVCHmvhKBJFmaFL2BXNto69_v8lz-3oGnFL5FkUr4RRpukd_6tj7-RZzx15LIzdTqzKfAUlqWoZUdze8Fcd1NJ6w1g49CCghvN_eryvecALpjnHoBkKlIXnSm_udiSf26cYWvCikmW5g8nUqAduFsIYfR-4LMwyUfYH1hNC64SRsfLH9bL4-tyeaoUCv5MXTIhxrJbrhQy3TEOSc5didDrMoYNUu_qjJvxBQbq1Um1W1SpyvSd4eVJn18xZcOmCnoE73RDZcxT5hDpaRQ==");
}

#[test]
fn get_token_test() {
    //  This test will always pass, output is logged via debug macro
    use auth::JwtClaims;
    use smpl_jwt::{RSAKey, Jwt};
    use scopes::Scope;


    let token_url = "https://www.googleapis.com/oauth2/v4/token";
    let iss = "some_iss"; // https://developers.google.com/identity/protocols/OAuth2ServiceAccount
    let private_key_file = "random_rsa_for_testing";

    let claims = JwtClaims::new(String::from(iss),
                                &Scope::DevStorageReadWrite,
                                String::from(token_url),
                                None, None);
    let key = match RSAKey::from_pem(private_key_file) {
        Ok(x) => x,
        Err(e) => panic!("{}", e)
    };
    let jwt = Jwt::new(claims, key, None);
    match get_token_legacy(&jwt, None) {
        Ok(x) => println!("{}", x),
        Err(e) => println!("{}", e)
    };
}


/// Get Token which can be used to authenticate further request
/// ### Example
///
/// ```
/// extern crate smpl_jwt;
/// extern crate goauth;
/// #[macro_use]
/// extern crate log;
///
/// use goauth::auth::JwtClaims;
/// use goauth::scopes::Scope;
/// use goauth::credentials::Credentials;
/// use goauth::get_token_with_creds;
/// use smpl_jwt::Jwt;
///
/// fn main() {
///
///   let credentials = Credentials::from_file("dummy_credentials_file_for_tests.json").unwrap();
///
///   let claims = JwtClaims::new(credentials.iss(),
///                              &Scope::DevStorageReadWrite,
///                              credentials.token_uri(),
///                              None, None);
///
///   let jwt = Jwt::new(claims, credentials.rsa_key().unwrap(), None);
///   match get_token_with_creds(&jwt, &credentials) {
///     Ok(x) => debug!("{}", x),
///     Err(e) => debug!("{}", e)
///   };
/// }
///
/// ```
pub fn get_token_with_creds(jwt: &Jwt<JwtClaims>, credentials: &Credentials) -> Result<Token, GOErr> {
    let final_jwt = jwt.finalize()?;
    let request_body = form_body(&final_jwt);

    let client = Client::new();
    let mut response = client.post(&credentials.token_uri())
        .form(&request_body).send()?;

    Token::from_str(&response.text()?)
}


/// Async get Token which can be used to authenticate further request
/// ### Example
///
/// ```
/// extern crate smpl_jwt;
/// extern crate goauth;
/// #[macro_use]
/// extern crate log;
/// extern crate futures;
///
/// use goauth::auth::JwtClaims;
/// use goauth::scopes::Scope;
/// use goauth::credentials::Credentials;
/// use goauth::error::GOErr;
/// use goauth::get_token_with_creds_async;
/// use smpl_jwt::Jwt;
/// use futures::future::Future;
///
///
/// fn main() -> Result<(), GOErr> {
///
///   let credentials = Credentials::from_file("dummy_credentials_file_for_tests.json").unwrap();
///
///   let claims = JwtClaims::new(credentials.iss(),
///                              &Scope::DevStorageReadWrite,
///                              credentials.token_uri(),
///                              None, None);
///
///   let jwt = Jwt::new(claims, credentials.rsa_key().unwrap(), None);
///   match get_token_with_creds_async(&jwt, &credentials).wait() {
///     Ok(x) => debug!("{}", x?),
///     Err(_) => error!("An error occurred, somewhere in there, tyr debugging with `get_token_with_creds`")
///   };
///   Ok(())
/// }
///
/// ```
pub fn get_token_with_creds_async(jwt: &Jwt<JwtClaims>, credentials: &Credentials) -> impl Future<Item=Result<Token, GOErr>> {
    let final_jwt = match jwt.finalize() {
        Ok(x) => x,
        Err(e) => panic!(e)
    };
    let request_body = form_body(&final_jwt);

    let client = aClient::new();
    client.post(&credentials.token_uri())
        .form(&request_body)
        .send()
        .and_then(|mut res| {
            println!("{}", res.status());
            res.json::<Token>()
        }).map(Ok)
}