use std::env;
use futures::Future;
use actix_files as fs;
use actix_web::{web, App, HttpServer, HttpResponse, Error};
use lootalot_db::{Pool, DbApi, QueryResult};

type AppPool = web::Data<Pool>;

/// Wraps call to the DbApi and process its result as a async HttpResponse
///
/// Provides a convenient way to call the api inside a route definition. Given a connection pool,
/// access to the api is granted in a closure. The closure is called in a blocking way and should
/// return a QueryResult.
/// If the query succeeds, it's result is returned as JSON data. Otherwise, an InternalServerError
/// is returned.
///
/// # Usage
/// ```
///     (...)
///     .route("path/to/",
///         move |pool: web::Data<Pool>| {
///             // user data can be processed here
///             // ...
///             db_call(pool, move |api| {
///                 // ...do what you want with the api
///             }
///         }
///     )
/// ```
pub fn db_call<
    J: serde::ser::Serialize + Send + 'static,
    Q: Fn(DbApi) -> QueryResult<J> + Send + 'static,
>(
    pool: AppPool,
    query: Q,
) -> impl Future<Item = HttpResponse, Error = Error> {
    let conn = pool.get().unwrap();
    web::block(move || {
        let api = DbApi::with_conn(&conn);
        query(api)
    })
    .then(|res| match res {
        Ok(players) => HttpResponse::Ok().json(players),
        Err(e) => {
            dbg!(&e);
            HttpResponse::InternalServerError().finish()
        }
    })
}

pub(crate) fn serve() -> std::io::Result<()> {
    let www_root: String = env::var("WWW_ROOT").expect("WWW_ROOT must be set");
    dbg!(&www_root);
    let pool = lootalot_db::create_pool();

    HttpServer::new(move || {
        App::new()
            .data(pool.clone())
            .route(
                "/players",
                web::get().to_async(move |pool: AppPool| {
                    db_call(pool, move |api| api.fetch_players())
                }),
            )
            .route(
                "/update-wealth/{player_id}/{amount}",
                web::get().to_async(move |pool: AppPool, data: web::Path<(i32, f32)>| {
                    let (player, gold) = *data;
                    db_call(pool, move |api| api.as_player(player).update_wealth(gold))
                }),
            )
            .route(
                "/loot/{player_id}",
                web::get().to_async(move |pool: AppPool, player_id: web::Path<i32>| {
                    let player_id: i32 = *player_id;
                    db_call(pool, move |api| api.as_player(player_id).loot())
                }),
            )
            .service(fs::Files::new("/", www_root.clone()).index_file("index.html"))
    })
    .bind("127.0.0.1:8088")?
    .run()
}