extern crate serde;
extern crate serde_json as json;
extern crate serde_qs as query;

use error::{Error, ErrorObject, RequestError};
use hyper::Client as HttpClient;
use hyper::client::RequestBuilder;
use hyper::header::{Authorization, Basic, ContentType, Headers};
use hyper::net::HttpsConnector;
use hyper_openssl::OpensslClient;
use std::io::Read;

pub struct Client {
    client: HttpClient,
    secret_key: String, // <-- not to be modified (b.c. Sync)
}

impl Client {
    pub fn new(secret_key: &str) -> Client {
        let ssl = OpensslClient::new().unwrap();
        let connector = HttpsConnector::new(ssl);
        Client{
            client: HttpClient::with_connector(connector),
            secret_key: secret_key.to_owned(),
        }
    }

    pub fn get<T: serde::Deserialize>(&self, path: &str) -> Result<T, Error> {
        let url = get_url(path);
        let request = self.client.get(&url).headers(self.headers());
        send(request)
    }

    pub fn post<T: serde::Deserialize, P: serde::Serialize>(&self, path: &str, params: P) -> Result<T, Error> {
        let url = get_url(path);
        let body = query::to_string(&params)?;
        let request = self.client.post(&url).headers(self.headers()).body(&body);
        send(request)
    }

    pub fn delete<T: serde::Deserialize>(&self, path: &str) -> Result<T, Error> {
        let url = get_url(path);
        let request = self.client.delete(&url).headers(self.headers());
        send(request)
    }

    fn headers(&self) -> Headers {
        let mut headers = Headers::new();
        headers.set(Authorization(Basic{username: self.secret_key.to_owned(), password: None}));
        headers.set(ContentType::form_url_encoded());
        headers
    }
}

fn get_url(path: &str) -> String {
    String::from("https://api.stripe.com/v1") + path
}

fn send<T: serde::Deserialize>(request: RequestBuilder) -> Result<T, Error> {
    let mut response = request.send()?;
    let mut body = String::with_capacity(4096);
    response.read_to_string(&mut body)?;

    let status = response.status_raw().0;
    match status {
        200...299 => {},
        _ => {
            let mut err = json::from_str(&body).unwrap_or_else(|err| {
                let mut req = ErrorObject{error: RequestError::default()};
                req.error.message = format!("failed to deserialize error: {}", err);
                req
            });
            err.error.http_status = status;
            return Err(Error::from(err.error));
        },
    }

    json::from_str(&body).map_err(|err| Error::from(err))
}