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#[macro_use]
extern crate rocket;

use rocket::response::content::RawHtml;
use rocket::response::Redirect;

type Session<'a> = rocket_session::Session<'a, Vec<String>>;

#[launch]
fn rocket() -> _ {
    rocket::build()
        .attach(Session::fairing())
        .mount("/", routes![index, add, remove])
}

#[get("/")]
fn index(session: Session) -> RawHtml<String> {
    let mut page = String::new();
    page.push_str(
        r#"
            <!DOCTYPE html>
            <h1>My Dogs</h1>

            <form method="POST" action="/add">
            Add Dog: <input type="text" name="name"> <input type="submit" value="Add">
            </form>

            <ul>
        "#,
    );
    session.tap(|sess| {
        for (n, dog) in sess.iter().enumerate() {
            page.push_str(&format!(
                r#"<li>&#x1F436; {} <a href="/remove/{}">Remove</a></li>"#,
                dog, n
            ));
        }
    });
    page.push_str("</ul>");
    RawHtml(page)
}

#[post("/add", data = "<dog>")]
fn add(session: Session, dog: String) -> Redirect {
    session.tap(move |sess| {
        sess.push(dog);
    });
    Redirect::found("/")
}

#[get("/remove/<dog>")]
fn remove(session: Session, dog: usize) -> Redirect {
    session.tap(|sess| {
        if dog < sess.len() {
            sess.remove(dog);
        }
    });
    Redirect::found("/")
}