#![feature(proc_macro_hygiene, decl_macro)]

#[macro_use] extern crate rocket;
use rocket::State;
use rocket::http::Status;
use rocket_contrib::json::Json;

use trust_dns_client::client::{Client, SyncClient};
use trust_dns_client::tcp::TcpClientConnection;
use trust_dns_client::op::{DnsResponse, ResponseCode};
use trust_dns_client::rr::{DNSClass, Name, RecordType};

mod models;
mod config;

use models::errors::ErrorResponse;


#[get("/zones/<zone>/records")]
fn get_zone_records(client: State<SyncClient<TcpClientConnection>>, zone: String) -> Result<Json<Vec<models::dns::Record>>, ErrorResponse<()>> {
    // TODO: Implement FromParam for Name
    let name = Name::from_utf8(&zone).unwrap();

    let response: DnsResponse = client.query(&name, DNSClass::IN, RecordType::AXFR).unwrap();

    if response.response_code() != ResponseCode::NoError {
        return ErrorResponse::new(
            Status::NotFound,
            format!("zone {} could not be found", name.to_utf8())
        ).err()
    }

    let answers = response.answers();
    let mut records: Vec<_> = answers.to_vec().into_iter()
        .map(|record| models::dns::Record::from(record))
        .filter(|record| match record.rdata {
            models::dns::RData::NULL { .. } | models::dns::RData::DNSSEC(_) => false,
            _ => true,
        }).collect();

    // AXFR response ends with SOA, we remove it so it is not doubled in the response.
    records.pop();

    Ok(Json(records))
}

fn main() {
    let app_config = config::load("config.toml".into());

    let conn = TcpClientConnection::new(app_config.dns_server.address).unwrap();
    let client = SyncClient::new(conn);

    rocket::ignite()
        .manage(client)
        .mount("/api/v1", routes![get_zone_records]).launch();
}