use std::env;
use std::thread::{spawn, sleep};
use std::time::{Duration};

use actix_web::{middleware, web, App, HttpMessage, HttpRequest, HttpResponse, HttpServer};
use actix_web::error::ResponseError;
use actix_web::http::{Cookie};
use actix_web::cookie::{SameSite};
use actix_cors::Cors;

use r2d2::{Pool};
use r2d2::{PooledConnection};
use r2d2_postgres::{TlsMode, PostgresConnectionManager};

use rpc::{RpcErrorResponse, AccountLoginParams, AccountCreateParams};
use warden::{warden};
use pubsub::{pg_listen};
use ws::{connect};
use account::{Account, account_create};
use payments::{post_stripe_event};

pub type Db = PooledConnection<PostgresConnectionManager>;
pub type PgPool = Pool<PostgresConnectionManager>;

const DB_POOL_SIZE: u32 = 20;

#[derive(Fail, Debug)]
pub enum MnmlHttpError {
    // User Facing Errors
    #[fail(display="internal server error")]
    ServerError,
    #[fail(display="unauthorized")]
    Unauthorized,
    #[fail(display="bad request")]
    BadRequest,
}

impl ResponseError for MnmlHttpError {
    fn error_response(&self) -> HttpResponse {
        match *self {
            MnmlHttpError::ServerError => HttpResponse::InternalServerError()
                .json(RpcErrorResponse { err: self.to_string() }),

            MnmlHttpError::BadRequest   => HttpResponse::BadRequest()
                .json(RpcErrorResponse { err: self.to_string() }),

            MnmlHttpError::Unauthorized => HttpResponse::Unauthorized()
                .cookie(Cookie::build("x-auth-token", "")
                    // .secure(secure)
                    .http_only(true)
                    .same_site(SameSite::Strict)
                    .max_age(-1) // 1 week aligns with db set
                    .finish())
                .json(RpcErrorResponse { err: self.to_string() }),
        }
    }
}

fn login_res(token: String) -> HttpResponse {
    HttpResponse::Ok()
        .cookie(Cookie::build("x-auth-token", token)
            // .secure(secure)
            .http_only(true)
            .same_site(SameSite::Strict)
            .max_age(60 * 60 * 24 * 7) // 1 week aligns with db set
            .finish())
        .finish()
}

fn logout_res() -> HttpResponse {
    HttpResponse::Ok()
        .cookie(Cookie::build("x-auth-token", "")
            // .secure(secure)
            .http_only(true)
            .same_site(SameSite::Strict)
            .max_age(-1)
            .finish())
        .finish()
}

fn login(state: web::Data<State>, params: web::Json::<AccountLoginParams>) -> Result<HttpResponse, MnmlHttpError> {
    let db = state.pool.get().or(Err(MnmlHttpError::ServerError))?;
    let mut tx = db.transaction().or(Err(MnmlHttpError::ServerError))?;

    match Account::login(&mut tx, &params.name, &params.password) {
        Ok(a) => {
            let token = Account::new_token(&mut tx, a.id).or(Err(MnmlHttpError::ServerError))?;
            tx.commit().or(Err(MnmlHttpError::ServerError))?;
            Ok(login_res(token))
        },
        Err(e) => {
            info!("{:?}", e);
            Err(MnmlHttpError::Unauthorized)
        }
    }
}

fn logout(r: HttpRequest, state: web::Data<State>) -> Result<HttpResponse, MnmlHttpError> {
    match r.cookie("x-auth-token") {
        Some(t) => {
            let db = state.pool.get().or(Err(MnmlHttpError::ServerError))?;
            let mut tx = db.transaction().or(Err(MnmlHttpError::ServerError))?;
            match Account::from_token(&mut tx, t.value().to_string()) {
                Ok(a) => {
                    Account::new_token(&mut tx, a.id).or(Err(MnmlHttpError::Unauthorized))?;
                    tx.commit().or(Err(MnmlHttpError::ServerError))?;
                    return Ok(logout_res());
                },
                Err(_) => Err(MnmlHttpError::Unauthorized),
            }
        },
        None => Err(MnmlHttpError::Unauthorized),
    }
}

fn register(state: web::Data<State>, params: web::Json::<AccountCreateParams>) -> Result<HttpResponse, MnmlHttpError> {
    let db = state.pool.get().or(Err(MnmlHttpError::ServerError))?;
    let mut tx = db.transaction().or(Err(MnmlHttpError::ServerError))?;

    match account_create(&params.name, &params.password, &params.code, &mut tx) {
        Ok(token) => {
            tx.commit().or(Err(MnmlHttpError::ServerError))?;
            Ok(login_res(token))
        },
        Err(e) => {
            info!("{:?}", e);
            Err(MnmlHttpError::BadRequest)
        }
    }
}

fn create_pool(url: String) -> Pool<PostgresConnectionManager> {
    let manager = PostgresConnectionManager::new(url, TlsMode::None)
        .expect("could not instantiate pg manager");

    Pool::builder()
        .max_size(DB_POOL_SIZE)
        .build(manager)
        .expect("Failed to create pool.")
}

pub struct State {
    pub pool: PgPool,
    // pub pubsub: PubSub,
}

pub fn start() {
    let database_url = env::var("DATABASE_URL")
        .expect("DATABASE_URL must be set");
    let pool = create_pool(database_url);

    let warden_pool = pool.clone();
    spawn(move || {
        loop {
            let db_connection = warden_pool.get().expect("unable to get db connection");
            if let Err(e) = warden(db_connection) {
                info!("{:?}", e);
            }
            sleep(Duration::new(1, 0));
        }
    });

    let pubsub_pool = pool.clone();
    spawn(move || loop {
        let pubsub_conn = pubsub_pool.get().expect("could not get pubsub pg connection");
        match pg_listen(pubsub_conn) {
            Ok(_) => warn!("pg listen closed"),
            Err(e) => warn!("pg_listen error {:?}", e),
        }
    });

    HttpServer::new(move || App::new()
        .data(State { pool: pool.clone() })
        .wrap(middleware::Logger::default())
        .wrap(Cors::new().supports_credentials())
        .service(web::resource("/api/login").route(web::post().to(login)))
        .service(web::resource("/api/logout").route(web::post().to(logout)))
        .service(web::resource("/api/register").route(web::post().to(register)))

        .service(web::resource("/api/payments/stripe")
            .route(web::post().to(post_stripe_event)))

        // .service(web::resource("/api/payments/crypto")
        //     .route(web::post().to(post_stripe_payment)))

        .service(web::resource("/api/ws").route(web::get().to(connect))))
        .bind("127.0.0.1:40000").expect("could not bind to port")
        .run().expect("could not start http server");
}