//! Error types for Minion bindings.

use crate::ffi;

use thiserror::Error;

/// A wrapper over all errors thrown by `minion_rs`.

///

/// `Error` allows functions involving Minion to return a single error type. All error types in

/// `minion_rs` are able to be converted into this type using into / from.

pub enum MinionError {

    #[error("runtime error: `{0}.to_string()`")]

    RuntimeError(#[from] RuntimeError),

    #[error("not implemented: {0}")]

    NotImplemented(String),

    #[error(transparent)]

    Other(#[from] anyhow::Error), // source and Display delegate to anyhow::Error

}

/// RuntimeErrors are thrown by Minion during execution.

///

/// These represent internal Minion C++ exceptions translated into Rust.

///

/// Invalid usage of this library should throw an error before Minion is even run. Therefore, these

/// should be quite rare. Consider creating an issue on

/// [Github](https://github.com/conjure-cp/conjure-oxide) if these occur regularly!

pub enum RuntimeError {

    // These closely follow the ReturnCodes found in Minion's libwrapper.cpp.

    /// The model given to Minion is invalid.

    #[error("the given instance is invalid")]

    InvalidInstance,

    /// An unknown error has occurred.

    #[error("an unknown error has occurred while running minion")]

    UnknownError,

}

// Minion's ReturnCodes are passed over FFI as ints.

// Convert them to their appropriate error.

impl From<u32> for RuntimeError {

            #[allow(non_upper_case_globals)]

        }

}