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// This file is part of Substrate.

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: Apache-2.0

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/// State Machine Errors
use core::fmt;

/// State Machine Error bound.
///
/// This should reflect Wasm error type bound for future compatibility.
pub trait Error: 'static + fmt::Debug + fmt::Display + Send + Sync {}

impl<T: 'static + fmt::Debug + fmt::Display + Send + Sync> Error for T {}

/// Externalities Error.
///
/// Externalities are not really allowed to have errors, since it's assumed that dependent code
/// would not be executed unless externalities were available. This is included for completeness,
/// and as a transition away from the pre-existing framework.
#[derive(Debug, Eq, PartialEq)]
#[allow(missing_docs)]
#[cfg_attr(feature = "std", derive(thiserror::Error))]
pub enum ExecutionError {
	#[cfg_attr(feature = "std", error("Backend error {0:?}"))]
	Backend(crate::DefaultError),

	#[cfg_attr(feature = "std", error("`:code` entry does not exist in storage"))]
	CodeEntryDoesNotExist,

	#[cfg_attr(feature = "std", error("Unable to generate proof"))]
	UnableToGenerateProof,

	#[cfg_attr(feature = "std", error("Invalid execution proof"))]
	InvalidProof,
}