use actix_web::http::header::IntoHeaderValue;
use actix_web::HttpResponse;
use std::str::FromStr;
use std::fmt::{Display, Debug};

pub fn redirect(path: impl IntoHeaderValue) -> actix_web::Result<HttpResponse> {
    Ok(HttpResponse::SeeOther()
        .header("location", path) // back - to where?
        .finish())
}

pub trait ParseOrBadReq {
    fn parse_or_bad_request<T, E>(&self) -> actix_web::Result<T>
        where T: FromStr<Err=E>,
              E: Display + Debug + 'static;
}

impl ParseOrBadReq for &str {
    fn parse_or_bad_request<T, E>(&self) -> actix_web::Result<T>
        where T: FromStr<Err=E>,
              E: Display + Debug + 'static
    {
        self.parse::<T>()
            .map_err(|e| {
                error!("Parse error for \"{}\"", self);
                actix_web::error::ErrorBadRequest(e)
            })
    }
}

impl ParseOrBadReq for String {
    fn parse_or_bad_request<T, E>(&self) -> actix_web::Result<T>
        where T: FromStr<Err=E>,
              E: Display + Debug + 'static
    {
        self.as_str()
            .parse_or_bad_request()
    }
}