//! Provides the [`crate::Error`] type.

use thiserror::Error;
use hyper::StatusCode;

/// Encapsulates a status code and an error message.
#[derive(Error, Debug)]
#[error("SimpleError({code}, {message})")]
pub struct SimpleError {
    pub code: StatusCode,
    pub message: String,
}

impl SimpleError {
    /// Returns an HTTP response builder with the status code set to `self.code`.
    pub fn response_builder(&self) -> hyper::http::response::Builder {
        hyper::Response::builder().status(self.code)
    }
}

/// Error type for request handlers.
///
/// All client errors in [`crate::request`] implement [`Into<Error::Simple>`].
#[derive(Error, Debug)]
pub enum Error {
    #[error("SimpleError({}, {})", .0.code, .0.message)]
    Simple(#[from] SimpleError),

    #[error("ResponseError({})", .0.status())]
    Response(hyper::Response<hyper::Body>),
}

impl Error {
    // some convenience methods

    pub fn simple(code: StatusCode, message: String) -> Self {
        Error::Simple(SimpleError{code, message})
    }

    pub fn bad_request(message: String) -> Self {
        Error::Simple(SimpleError{code: StatusCode::BAD_REQUEST, message})
    }

    pub fn not_found(message: String) -> Self {
        Error::Simple(SimpleError{code: StatusCode::NOT_FOUND, message})
    }

    pub fn unauthorized(message: String) -> Self {
        Error::Simple(SimpleError{code: StatusCode::UNAUTHORIZED, message})
    }

    pub fn internal(message: String) -> Self {
        Error::Simple(SimpleError{code: StatusCode::INTERNAL_SERVER_ERROR, message})
    }

    pub fn method_not_allowed(message: String) -> Self {
        Error::Simple(SimpleError{code: StatusCode::METHOD_NOT_ALLOWED, message})
    }
}

macro_rules! impl_into_error_simple {
    ($type:ident, $status:expr) => {
       impl From<$type> for crate::error::Error {
            fn from(err: $type) -> Self {
                Self::Simple(crate::error::SimpleError{code: $status, message: format!("{}", err)})
            }
       }
    };
}