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use super::WebError;
use oxide_auth::endpoint::OAuthError;

use rocket::Request;
use rocket::http::Status;
use rocket::response::{Responder, Result};
use self::OAuthError::*;
use self::Kind::*;

/// Failed handling of an oauth request, providing a response.
///
/// The error responses generated by this type are *not* part of the stable interface. To create
/// stable error pages or to build more meaningful errors, either destructure this using the
/// `oauth` and `web` method or avoid turning errors into this type by providing a custom error
/// representation.
#[derive(Clone, Debug)]
pub struct OAuthFailure {
    inner: Kind,
}

impl OAuthFailure {
    /// Get the `OAuthError` causing this failure.
    pub fn oauth(&self) -> Option<OAuthError> {
        match &self.inner {
            OAuth(err) => Some(*err),
            _ => None,
        }
    }

    /// Get the `WebError` causing this failure.
    pub fn web(&self) -> Option<WebError> {
        match &self.inner {
            Web(err) => Some(*err),
            _ => None,
        }
    }
}

#[derive(Clone, Debug)]
enum Kind {
    Web(WebError),
    OAuth(OAuthError),
}

impl<'r> Responder<'r> for OAuthFailure {
    fn respond_to(self, _: &Request) -> Result<'r> {
        match self.inner {
            Web(_) | OAuth(DenySilently) | OAuth(BadRequest) => Err(Status::BadRequest),
            OAuth(PrimitiveError) => Err(Status::InternalServerError),
        }
    }
}

impl From<OAuthError> for OAuthFailure {
    fn from(err: OAuthError) -> Self {
        OAuthFailure { inner: OAuth(err) }
    }
}

impl From<WebError> for OAuthFailure {
    fn from(err: WebError) -> Self {
        OAuthFailure { inner: Web(err) }
    }
}