use axum::{
	http::{StatusCode, header::InvalidHeaderValue},
	response::{IntoResponse, Response},
};
use oxide_auth::frontends::{dev::OAuthError, simple::endpoint::Error};

use super::OidcRequest;

#[derive(Debug)]
/// The error type for Oxide Auth operations
pub enum OidcError {
	/// Errors occurring in Endpoint operations
	Endpoint(OAuthError),
	/// Errors occurring in Endpoint operations
	Header(InvalidHeaderValue),
	/// Errors with the request encoding
	Encoding,
	/// Request body could not be parsed as a form
	Form,
	/// Request query was absent or could not be parsed
	Query,
	/// Request query was absent or could not be parsed
	Body,
	/// The Authorization header was invalid
	Authorization,
	/// General internal server error
	InternalError(Option<String>),
}

impl std::fmt::Display for OidcError {
	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
		match *self {
			| Self::Endpoint(ref e) => write!(f, "Endpoint, {e}"),
			| Self::Header(ref e) => write!(f, "Couldn't set header, {e}"),
			| Self::Encoding => write!(f, "Error decoding request"),
			| Self::Form => write!(f, "Request is not a form"),
			| Self::Query => write!(f, "No query present"),
			| Self::Body => write!(f, "No body present"),
			| Self::Authorization => write!(f, "Request has invalid Authorization headers"),
			| Self::InternalError(None) => write!(f, "An internal server error occurred"),
			| Self::InternalError(Some(ref e)) =>
				write!(f, "An internal server error occurred: {e}"),
		}
	}
}

impl std::error::Error for OidcError {
	fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
		match *self {
			| Self::Endpoint(ref e) => e.source(),
			| Self::Header(ref e) => e.source(),
			| _ => None,
		}
	}
}

impl IntoResponse for OidcError {
	fn into_response(self) -> Response {
		(StatusCode::INTERNAL_SERVER_ERROR, self.to_string()).into_response()
	}
}

impl From<Error<OidcRequest>> for OidcError {
	fn from(e: Error<OidcRequest>) -> Self {
		match e {
			| Error::Web(e) => e,
			| Error::OAuth(e) => e.into(),
		}
	}
}

impl From<OAuthError> for OidcError {
	fn from(e: OAuthError) -> Self { Self::Endpoint(e) }
}

impl From<InvalidHeaderValue> for OidcError {
	fn from(e: InvalidHeaderValue) -> Self { Self::Header(e) }
}