use crate::auth::Claims;
use crate::AppState;
use actix_web::{
    dev::Payload, error::ErrorUnauthorized, http, http::header::HeaderValue, web,
    Error as ActixWebError, FromRequest, HttpRequest,
};
use jsonwebtoken::{
    decode, errors::Error as JwtError, Algorithm, DecodingKey, TokenData, Validation,
};
use serde::{Deserialize, Serialize};
use std::future::{ready, Ready};

#[derive(Serialize, Deserialize, Debug)]
pub struct AuthenticationToken {
    pub id: usize,
}

impl FromRequest for AuthenticationToken {
    type Error = ActixWebError;
    type Future = Ready<Result<Self, Self::Error>>;

    fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future {
        // get auth token from the authorization header
        let auth_header: &HeaderValue = match req.headers().get(http::header::AUTHORIZATION) {
            Some(res) => res,
            None => return ready(Err(ErrorUnauthorized("No authorization token given"))),
        };

        let auth_token: String = auth_header.to_str().unwrap_or("").to_string(); // check errors later
                                                                                 // stop empty and weird (ascii, chinese...) auth_token strings:
        if auth_token.is_empty() {
            return ready(Err(ErrorUnauthorized("Invalid auth token!")));
        }
        let secret: String = req
            .app_data::<web::Data<AppState>>()
            .unwrap()
            .secret
            .to_string();

        // decode token with secret
        let decode: Result<TokenData<Claims>, JwtError> = decode::<Claims>(
            &auth_token,
            &DecodingKey::from_secret(secret.as_str().as_ref()),
            &Validation::new(Algorithm::HS256),
        );

        println!("{}", auth_token);
        // return authenticationtoken
        match decode {
            Ok(token) => ready(Ok(AuthenticationToken {
                id: token.claims.id,
            })),
            Err(_) => ready(Err(ErrorUnauthorized("Unauthorized!"))),
        }
    }
}

/* Example execution in curl:
curl localhost:8000/auth/protected -H "Accept: application/json" -H "Authorization: eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpZCI6MSwiZXhwIjoxNzY5MjAyNjU1fQ.QbWkgjmbmMwLJnia6vd67EfRkf6y-4nw572g-Nk0BOE"
*/