use std::{error, fmt};
use rocket::response::{self, Responder, Response};
use rocket::http::Status;
use rocket::request::Request;


#[derive(Debug, Clone)]
pub struct DbResponse {
    err_msg: &'static str
}

pub type DbError<T, DbErr> = std::result::Result<T, DbErr>;


impl fmt::Display for DbResponse {
    fn fmt(&self, f:&mut fmt::Formatter) -> fmt::Result {
        write!(f, "Database error")
    }
}
impl error::Error for DbResponse {
    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
        None
    }
}
impl<'r> Responder<'r> for DbResponse {
    fn respond_to(self, _:&Request) -> response::Result<'r> {
        Response::build()
            .status(Status::InternalServerError)
            .raw_header("db-error", self.err_msg)
            .ok()
    }
}