#[macro_use]
extern crate lazy_static;
use actix_web::{get, post, App, HttpResponse, HttpServer, Responder};
use base64::decode;
use listenfd::ListenFd;
use regex::Regex;

lazy_static! {
    static ref DATA_URI_RE: Regex =
        Regex::new("^data:image/(?P<format>png|jpg|jpeg);base64,(?P<data>.+)")
            .expect("Couldn't parse Regex!");
}

#[get("/")]
async fn hello() -> impl Responder {
    HttpResponse::Ok().body("Hey, this is an API!")
}

#[post("/products")]
async fn create_product(req_body: String) -> impl Responder {
    let caps = if let Some(c) = DATA_URI_RE.captures(&req_body) {
        c
    } else {
        return HttpResponse::BadRequest().body("Invalid data URI or image format.");
    };

    let format = caps
        .name("format")
        .expect("Data URI format extraction should never fail.")
        .as_str();
    let data = caps
        .name("data")
        .expect("Data URI data extraction should never fail.")
        .as_str();

    let bytes = if let Ok(b) = decode(data) {
        b
    } else {
        return HttpResponse::BadRequest().body("Invalid image data in data URI.");
    };

    let img = image::load_from_memory(&bytes).unwrap();
    img.save("test.png").unwrap();
    HttpResponse::Ok().body(format!("created\n{}\n{}", format, data))
}

#[get("/products")]
async fn get_products(_req_body: String) -> impl Responder {
    HttpResponse::Ok().body("got product!")
}

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    let mut listenfd = ListenFd::from_env();
    let mut server = HttpServer::new(|| {
        App::new()
            .service(hello)
            .service(create_product)
            .service(get_products)
    });

    server = if let Some(l) = listenfd.take_tcp_listener(0).unwrap() {
        // "Debug mode" with cargo watch auto-reloading
        server.listen(l)?
    } else {
        // "Release mode"
        server.bind("127.0.0.1:8000")?
    };

    server.run().await
}