use std::fmt::{Display, Formatter};
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};
use actix_web::{web, App, HttpResponse, HttpServer, get, Responder, HttpRequest};
use log::{LevelFilter};
use systemd_journal_logger::{connected_to_journal, JournalLog};


macro_rules! info {
    ($msg:tt) => {
        match connected_to_journal() {
            true => log::info!("[INFO] {}", $msg),
            false => println!("[INFO] {}", $msg),
        }
    };
}

macro_rules! warn {
    ($msg:tt) => {
        match connected_to_journal() {
            true => log::warn!("[WARN] {}", $msg),
            false => println!("[WARN] {}", $msg),
        }
    };
}

macro_rules! error {
    ($msg:tt) => {
        match connected_to_journal() {
            true => log::error!("[ERROR] {}", $msg),
            false => eprintln!("[ERROR] {}", $msg),
        }
    };
}

#[derive(Clone)]
enum Protocol {
    Http,
    Https
}

impl Display for Protocol {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        match self {
            Protocol::Http => write!(f, "http://"),
            Protocol::Https => write!(f, "https://")
        }
    }
}

#[derive(Clone)]
struct DomainLinkConfig {
    domain: String,
    protocol: Protocol,
    target: String,
}

#[derive(Clone)]
struct Config {
    redirects: Vec<DomainLinkConfig>,
    ports: Vec<u16>,
    addresses: Vec<IpAddr>,
}

#[actix_web::main]
async fn main() -> std::io::Result<()> {
    JournalLog::new().expect("Systemd-Logger crate error").install().expect("Systemd-Logger crate error");
    log::set_max_level(LevelFilter::Info);

    let config = Config {
        redirects: vec![
            DomainLinkConfig {
                domain: "neshura.me".to_owned(),
                protocol: Protocol::Https,
                target: "neshweb.net".to_owned(),
            },
            DomainLinkConfig {
                domain: "lemmy.neshura.me".to_owned(),
                protocol: Protocol::Https,
                target: "bookwormstory.social/u/neshura".to_owned()
            },
            DomainLinkConfig {
                domain: "test2.neshura.me".to_owned(),
                protocol: Protocol::Https,
                target: "neshweb.net".to_owned()
            }
        ],
        ports: vec![8080, 8090],
        addresses: vec![
            IpAddr::V6(Ipv6Addr::new(0, 0, 0, 0, 0, 0, 0, 1)),
            IpAddr::V4(Ipv4Addr::new(192, 168, 178, 11))
        ],
    };

    let msg = "This Build is not intended for production use!";
    info!("Test Info");
    warn!(msg);
    error!(msg);

    let mut server = HttpServer::new(move || {
        App::new()
            .app_data(web::Data::new(config.redirects.clone()))
            .service(handle)
            .service(dry_handle)
    });
    
    for address in config.addresses.iter() {
        for port in config.ports.iter() {
            server = server.bind((*address, *port))?
        }
    }
    server.run().await
}

#[get("/")]
async fn handle(redirects: web::Data<Vec<DomainLinkConfig>>, request: HttpRequest) -> impl Responder {
    if let Some(host_raw) = request.headers().get("host") {
        let host = host_raw.to_str().expect("host conversion to string should never fail");
        println!("{host}");
        for redirect in redirects.iter() {
            if redirect.domain == host {
                return HttpResponse::PermanentRedirect().insert_header(("location", format!("{}{}", redirect.protocol, redirect.target).as_str())).finish();
            }
        }
        let fail_msg = format!("No Redirect for {host} found");
        return HttpResponse::NotFound().body(fail_msg)
    }
    HttpResponse::NotFound().body("Host not specified")
}

#[get("/dry")]
async fn dry_handle(redirects: web::Data<Vec<DomainLinkConfig>>, request: HttpRequest) -> impl Responder {
    if let Some(host_raw) = request.headers().get("host") {
        let host = host_raw.to_str().expect("host conversion to string should never fail");
        println!("{host}");
        for redirect in redirects.iter() {
            if redirect.domain == host {
                let body = format!("Redirecting: {} -> {}{}", host, redirect.protocol, redirect.target);
                return HttpResponse::Ok().body(body);
            }
        }
        let fail_msg = format!("No Redirect for {host} found");
        return HttpResponse::NotFound().body(fail_msg)
    }
    HttpResponse::NotFound().body("Host not specified")
}