extern crate actix;
extern crate actix_web;
extern crate env_logger;
#[macro_use]
extern crate tera;

use std::collections::HashMap;

use actix_web::{
    error, http, middleware, server, App, Error, HttpResponse, Query, State,
};

struct AppState {
    template: tera::Tera, // <- store tera template in application state
}

fn index(
    (state, query): (State<AppState>, Query<HashMap<String, String>>),
) -> Result<HttpResponse, Error> {
    let s = if let Some(name) = query.get("name") {
        // <- submitted form
        let mut ctx = tera::Context::new();
        ctx.add("name", &name.to_owned());
        ctx.add("text", &"Welcome!".to_owned());
        state
            .template
            .render("user.html", &ctx)
            .map_err(|_| error::ErrorInternalServerError("Template error"))?
    } else {
        state
            .template
            .render("index.html", &tera::Context::new())
            .map_err(|_| error::ErrorInternalServerError("Template error"))?
    };
    Ok(HttpResponse::Ok().content_type("text/html").body(s))
}

fn main() {
    ::std::env::set_var("RUST_LOG", "actix_web=info");
    env_logger::init();
    let sys = actix::System::new("tera-example");

    server::new(|| {
        let tera =
            compile_templates!(concat!(env!("CARGO_MANIFEST_DIR"), "/templates/**/*"));

        App::with_state(AppState { template: tera })
            // enable logger
            .middleware(middleware::Logger::default())
            .resource("/", |r| r.method(http::Method::GET).with(index))
    })
    .bind("127.0.0.1:8080")
    .unwrap()
    .start();

    println!("Started http server: 127.0.0.1:8080");
    let _ = sys.run();
}