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#![cfg_attr(test, deny(warnings))]

extern crate conduit;
extern crate conduit_middleware;
extern crate cookie;
extern crate rustc_serialize;
#[cfg(test)] extern crate conduit_test;

use std::error::Error;
use std::collections::hash_map::Entry;
use conduit::{Request, Response};
use cookie::{CookieJar, Cookie};

pub use session::{RequestSession, SessionMiddleware};

mod session;

pub struct Middleware {
    key: Vec<u8>,
}

impl Middleware {
    pub fn new(key: &[u8]) -> Middleware {
        Middleware { key: key.to_vec() }
    }
}

impl conduit_middleware::Middleware for Middleware {
    fn before(&self, req: &mut Request) -> Result<(), Box<Error+Send>> {
        let jar = {
            let headers = req.headers();
            let mut jar = CookieJar::new(&self.key);
            match headers.find("Cookie") {
                Some(cookies) => {
                    for cookie in cookies.iter() {
                        for cookie in cookie.split(';').map(|s| s.trim()) {
                            match Cookie::parse(cookie) {
                                Ok(c) => jar.add_original(c),
                                Err(..) => {}
                            }
                        }
                    }
                }
                None => {}
            }
            jar
        };
        req.mut_extensions().insert(jar);
        Ok(())
    }

    fn after(&self, req: &mut Request, res: Result<Response, Box<Error+Send>>)
        -> Result<Response, Box<Error+Send>>
    {
        let mut res = try!(res);
        {
            let jar = req.cookies();
            let cookies = match res.headers.entry("Set-Cookie".to_string()) {
                Entry::Occupied(e) => e.into_mut(),
                Entry::Vacant(e) => e.insert(Vec::new()),
            };
            for delta in jar.delta().into_iter() {
                cookies.push(delta.to_string());
            }
        }
        Ok(res)
    }
}

pub trait RequestCookies {
    fn cookies(&self) -> &CookieJar<'static>;
}

impl<'a> RequestCookies for Request+'a {
    fn cookies(&self) -> &CookieJar<'static> {
        self.extensions().find::<CookieJar<'static>>()
            .expect("Missing cookie jar")
    }
}

#[cfg(test)]
mod tests {
    use std::collections::HashMap;
    use std::io::{self, Cursor};

    use conduit::{Request, Response, Handler, Method};
    use conduit_middleware::MiddlewareBuilder;
    use cookie::Cookie;
    use conduit_test::MockRequest;

    use super::{RequestCookies, Middleware};

    #[test]
    fn request_headers() {
        let mut req = MockRequest::new(Method::Post, "/articles");
        req.header("Cookie", "foo=bar");

        let mut app = MiddlewareBuilder::new(test);
        app.add(Middleware::new(b"foo"));
        assert!(app.call(&mut req).is_ok());

        fn test(req: &mut Request) -> io::Result<Response> {
            assert!(req.cookies().find("foo").is_some());
            Ok(Response {
                status: (200, "OK"),
                headers: HashMap::new(),
                body: Box::new(Cursor::new(Vec::new())),
            })
        }
    }

    #[test]
    fn set_cookie() {
        let mut req = MockRequest::new(Method::Post, "/articles");
        let mut app = MiddlewareBuilder::new(test);
        app.add(Middleware::new(b"foo"));
        let response = app.call(&mut req).ok().unwrap();
        let v = &response.headers["Set-Cookie"];
        assert_eq!(&v[..], ["foo=bar".to_string()]);

        fn test(req: &mut Request) -> io::Result<Response> {
            let c = Cookie::new("foo".to_string(), "bar".to_string());
            req.cookies().add(c);
            Ok(Response {
                status: (200, "OK"),
                headers: HashMap::new(),
                body: Box::new(Cursor::new(Vec::new())),
            })
        }
    }
}