use tide::{
    http::mime,
    sessions::{CookieStore, SessionMiddleware},
    Next, Redirect, Request, Response, Result, StatusCode,
};

use std::{env, future::Future, io::ErrorKind, pin::Pin};
use tera::Context;

use crate::{routes, State};

pub fn session() -> SessionMiddleware<CookieStore> {
    SessionMiddleware::new(
        CookieStore::new(),
        env::var("TIDE_SECRET")
            .expect(
                "Please provide a TIDE_SECRET value of at \
                      least 32 bytes in order to run this example",
            )
            .as_bytes(),
    )
}

pub fn require_auth<'a>(
    req: Request<State>,
    next: Next<'a, State>,
) -> Pin<Box<dyn Future<Output = Result> + 'a + Send>> {
    Box::pin(async {
        let logged_in: bool = req.session().get("logged_in").unwrap_or(false);
        if logged_in {
            Ok(next.run(req).await)
        } else {
            let login_path = &req.state().login_path;
            Ok(Redirect::new(login_path).into())
        }
    })
}

pub fn require_guest<'a>(
    req: Request<State>,
    next: Next<'a, State>,
) -> Pin<Box<dyn Future<Output = Result> + 'a + Send>> {
    Box::pin(async {
        let logged_in: bool = req.session().get("logged_in").unwrap_or(false);
        if logged_in {
            Ok(Redirect::new("/").into())
        } else {
            Ok(next.run(req).await)
        }
    })
}

pub async fn errors(mut res: Response) -> Result<Response> {
    let mut context = Context::new();

    match res.downcast_error::<async_std::io::Error>() {
        Some(e) => {
            context.insert("error", &e.to_string());
            let status = if let ErrorKind::NotFound = e.kind() {
                StatusCode::NotFound
            } else {
                StatusCode::InternalServerError
            };
            let body: String = routes::render_template("error.html", &context)?;
            res.set_body(body);
            res.set_status(status);
            res.set_content_type(mime::HTML);
        }
        None => match res.status() {
            StatusCode::NotFound => {
                context.insert("error", "Page not found");
                res.set_body(routes::render_template("error.html", &context)?);
                res.set_content_type(mime::HTML);
            }
            _ => {}
        },
    };

    Ok(res)
}