use crate::extractors::base::FromRequestAsync;
use crate::state::AppState;
use crate::utility::jwt;
use actix_macros::MiddlewareError;
use actix_web::body::BoxBody;
use actix_web::dev::Payload;
use actix_web::http::header;
use actix_web::{web, HttpRequest};
use database::entity::User;
use database::query::Query;
use derive_more::Display;
use serde::{Deserialize, Serialize};
use std::fmt::Debug;

#[derive(Clone, Debug, PartialEq, Serialize, Deserialize, Display, MiddlewareError)]
#[status_code = "actix_web::http::StatusCode::UNAUTHORIZED"]
#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
pub enum Error {
    /// There is no Authorization header or cookie in the request.
    #[display("No Authorization header or cookie found")]
    NoHeaderOrCookieFound,

    /// Unknown authorization type other than Bearer.
    #[display("Bearer token is required")]
    UnknownAuthorizationType,

    /// Invalid or expired access token.
    #[display("Invalid or expired access token")]
    InvalidAccessToken,

    /// The user bound to the token is not found in the database.
    #[display("No user associated with access token")]
    NoUser,
}

impl Error {
    pub fn into_err(self) -> actix_web::Error {
        actix_web::Error::from(self)
    }
}

fn get_access_token_from_header(req: &HttpRequest) -> Result<String, Error> {
    let header_value = req
        .headers()
        .get(header::AUTHORIZATION)
        .ok_or(Error::NoHeaderOrCookieFound)?
        .to_str()
        .map_err(|_| Error::NoHeaderOrCookieFound)?
        .to_string();

    let parts = header_value
        .split_once(' ')
        .ok_or(Error::UnknownAuthorizationType)?;

    if parts.0 != "Bearer" {
        Err(Error::UnknownAuthorizationType)
    } else {
        Ok(parts.1.to_string())
    }
}

fn get_access_token_from_cookies(req: &HttpRequest) -> Result<String, Error> {
    let cookie = req
        .cookie("access_token")
        .ok_or(Error::NoHeaderOrCookieFound)?;

    Ok(cookie.value().to_string())
}

/// User extractor from request with Bearer access token.
impl FromRequestAsync for User {
    type Error = actix_web::Error;

    async fn from_request_async(
        req: &HttpRequest,
        _payload: &mut Payload,
    ) -> Result<Self, Self::Error> {
        let access_token = match get_access_token_from_header(req) {
            Err(Error::NoHeaderOrCookieFound) => {
                get_access_token_from_cookies(req).map_err(|error| error.into_err())?
            }
            Err(error) => {
                return Err(error.into_err());
            }
            Ok(access_token) => access_token,
        };

        let user_id = jwt::verify_and_decode(&access_token)
            .map_err(|_| Error::InvalidAccessToken.into_err())?;

        let db = req
            .app_data::<web::Data<AppState>>()
            .unwrap()
            .get_database();

        Query::find_user_by_id(db, &user_id)
            .await
            .map_err(|_| Error::NoUser.into())
            .and_then(|user| {
                if let Some(user) = user {
                    Ok(user)
                } else {
                    Err(actix_web::Error::from(Error::NoUser))
                }
            })
    }
}