extern crate reqwest;

use reqwest::{
    header::{Accept, qitem},
    mime,
    StatusCode,
};
use std::io::Read;

const ZOTAPI_CHANNEL_STREAM_PATH : &str = "/api/z/1.0/channel/stream";

#[derive(Debug)]
pub enum Error {
    Http(reqwest::Error),
    Io(std::io::Error),
    Unauthorized,
    Unknown,
}

impl From<reqwest::Error> for Error {
    fn from(e: reqwest::Error) -> Error {
        Error::Http(e)
    }
}

impl From<std::io::Error> for Error {
    fn from(e: std::io::Error) -> Error {
        Error::Io(e)
    }
}

pub struct Client {
    inner: reqwest::Client,
    base_url: String,
    user: String,
    pw: String,
}

impl Client {
    pub fn channel_stream(&self) -> Result<String, Error> {
        self.fetch_stream(ZOTAPI_CHANNEL_STREAM_PATH)
    }

    fn url(&self, path: &str) -> String {
        self.base_url.clone() + path
    }

    fn fetch_stream(&self, path: &str) -> Result<String, Error> {
        let url = self.url(path);
        let mut res = self.inner.get(&url)
            .header(Accept(vec![qitem(mime::APPLICATION_JSON)]))
            .basic_auth(self.user.clone(), Some(self.pw.clone()))
            .send()?;

        match res.status() {
            StatusCode::Unauthorized => Err(Error::Unauthorized),
            StatusCode::Ok => {
                let mut body = String::new();
                res.read_to_string(&mut body)?;
                Ok(body)
            },
            _ => Err(Error::Unknown)
        }
    }
}

pub fn client(url: &str, user: &str, pw: &str) -> Client
{
    Client {
        inner: reqwest::Client::new(),
        base_url: String::from(url),
        user: String::from(user),
        pw: String::from(pw),
    }
}

#[cfg(test)]
mod tests {
    #[test]
    fn it_works() {
        assert_eq!(2 + 2, 4);
    }
}