//! Provides the [`SputnikBuilder`] trait.

use cookie::Cookie;
use hyper::{StatusCode, header::{self, HeaderValue}, http};
use time::{Duration, OffsetDateTime};
use hyper::http::response::Builder;

pub trait SputnikBuilder {
    /// Adds a Set-Cookie header.
    fn set_cookie(&mut self, cookie: Cookie);

    /// Adds a Set-Cookie header to delete a cookie.
    fn delete_cookie(&mut self, name: &str);

    /// Sets the Content-Type.
    fn content_type(self, mime: mime::Mime) -> Builder;
}


pub fn redirect(location: &str, code: StatusCode) -> Builder {
    Builder::new().status(code).header(header::LOCATION, location)
}

impl SputnikBuilder for Builder {
    fn set_cookie(&mut self, cookie: Cookie) {
        self.headers_mut().unwrap().insert(header::SET_COOKIE, HeaderValue::from_str(&cookie.encoded().to_string()).unwrap());
    }

    fn delete_cookie(&mut self, name: &str) {
        let mut cookie = Cookie::new(name, "");
        cookie.set_max_age(Duration::seconds(0));
        cookie.set_expires(OffsetDateTime::now_utc() - Duration::days(365));
        self.set_cookie(cookie);
    }

    fn content_type(self, mime: mime::Mime) -> Self {
        self.header(header::CONTENT_TYPE, mime.to_string())
    }
}

pub trait EmptyBuilder<B> {
    /// Consume the builder with an empty body.
    fn empty(self) -> http::Result<http::response::Response<B>>;
}

impl EmptyBuilder<hyper::Body> for Builder {
    fn empty(self) -> http::Result<http::response::Response<hyper::Body>> {
        self.body(hyper::Body::empty())
    }
}