#[derive(Template)]
#[template(path = "calls.html")]
struct CallsTemplate<'a> {
    flash: &'a Option<String>,
    call_records: &'a Vec<CallRecord>,
    number_map: &'a HashMap<String, Kind>,
}

async fn show_call_list(mut req: tide::Request<()>) -> tide::Result<tide::Response> {
    let flash: Option<String> = req.session().get("flash");
    req.session_mut().remove("flash");
    let number_map = load_number_map()?;
    let records = load_call_records()?;
    let mut rdr = ReaderBuilder::new()
        .has_headers(false)
        .from_reader(records.as_bytes());

    let mut records: Vec<CallRecord> = rdr.deserialize().filter_map(Result::ok).collect();
    records.sort_by(CallRecord::compare_by_start);

    let hello = CallsTemplate {
        flash: &flash,
        call_records: &records,
        number_map: &number_map,
    };

    let response = Response::builder(200)
        .body(hello.render().expect("render"))
        .header("x-custom-header", "value")
        .content_type(tide::http::mime::HTML)
        .build();

    Ok(response)
}