#![feature(proc_macro_hygiene, decl_macro)]

#[macro_use]
extern crate rocket;
#[macro_use]
extern crate rocket_contrib;
#[macro_use]
extern crate diesel_migrations;

#[cfg(test)]
mod tests;

mod catchers;
mod routes;

// Very temporary solution for CORS
// https://stackoverflow.com/questions/62412361/how-to-set-up-cors-or-options-for-rocket-rs
use rocket::fairing::AdHoc;
use rocket::fairing::{Fairing, Info, Kind};
use rocket::http::Header;
use rocket::{Request, Response, Rocket};
use rocket_contrib::databases::diesel;
#[cfg(feature = "frontend")]
use rocket_contrib::serve::StaticFiles;

pub struct Cors;

impl Fairing for Cors {
    fn info(&self) -> Info {
        Info {
            name: "Add CORS headers to responses",
            kind: Kind::Response,
        }
    }

    fn on_response(&self, _: &Request, response: &mut Response) {
        response.set_header(Header::new("Access-Control-Allow-Origin", "*"));
        response.set_header(Header::new(
            "Access-Control-Allow-Methods",
            "POST, GET, PATCH, OPTIONS",
        ));
        response.set_header(Header::new("Access-Control-Allow-Headers", "*"));
        response.set_header(Header::new("Access-Control-Allow-Credentials", "true"));
    }
}

// Macro from diesel_migrations that sets up migrations
embed_migrations!();

// This defines a connection to the database
#[database("postgres_fej")]
pub struct FejDbConn(diesel::PgConnection);

// I'd like to thank Stackoverflow for helping me with this
// https://stackoverflow.com/questions/61047355/how-to-run-diesel-migration-with-rocket-in-production
fn run_db_migrations(rocket: Rocket) -> Result<Rocket, Rocket> {
    let conn = FejDbConn::get_one(&rocket).expect("database connection");
    match embedded_migrations::run(&*conn) {
        Ok(()) => Ok(rocket),
        Err(_) => Err(rocket),
    }
}

fn rocket() -> rocket::Rocket {
    // This needs to be muted for the frontend feature
    #[allow(unused_mut)]
    let mut rocket = rocket::ignite()
        .attach(Cors)
        .attach(FejDbConn::fairing())
        .attach(AdHoc::on_attach("Database Migrations", run_db_migrations))
        .mount("/api/ivago", routes::ivago()) // /api being hardcoded is temporary
        .register(catchers![catchers::not_found]);

    // TODO make all of this not hard-coded
    #[cfg(feature = "frontend")]
    {
        rocket = rocket.mount("/", StaticFiles::from("/app/dist"));
    }

    rocket
}

fn main() {
    rocket().launch();
}