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// This file is part of Substrate.

// Copyright (C) 2020-2022 Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

use jsonrpsee::{
	core::Error as JsonRpseeError,
	types::error::{CallError, ErrorObject},
};

#[derive(Debug, thiserror::Error)]
/// Top-level error type for the RPC handler
pub enum Error {
	/// The GRANDPA RPC endpoint is not ready.
	#[error("GRANDPA RPC endpoint not ready")]
	EndpointNotReady,
	/// GRANDPA reports the authority set id to be larger than 32-bits.
	#[error("GRANDPA reports authority set id unreasonably large")]
	AuthoritySetIdReportedAsUnreasonablyLarge,
	/// GRANDPA reports voter state with round id or weights larger than 32-bits.
	#[error("GRANDPA reports voter state as unreasonably large")]
	VoterStateReportsUnreasonablyLargeNumbers,
	/// GRANDPA prove finality failed.
	#[error("GRANDPA prove finality rpc failed: {0}")]
	ProveFinalityFailed(#[from] sc_finality_grandpa::FinalityProofError),
}

/// The error codes returned by jsonrpc.
pub enum ErrorCode {
	/// Returned when Grandpa RPC endpoint is not ready.
	NotReady = 1,
	/// Authority set ID is larger than 32-bits.
	AuthoritySetTooLarge,
	/// Voter state with round id or weights larger than 32-bits.
	VoterStateTooLarge,
	/// Failed to prove finality.
	ProveFinality,
}

impl From<Error> for ErrorCode {
	fn from(error: Error) -> Self {
		match error {
			Error::EndpointNotReady => ErrorCode::NotReady,
			Error::AuthoritySetIdReportedAsUnreasonablyLarge => ErrorCode::AuthoritySetTooLarge,
			Error::VoterStateReportsUnreasonablyLargeNumbers => ErrorCode::VoterStateTooLarge,
			Error::ProveFinalityFailed(_) => ErrorCode::ProveFinality,
		}
	}
}

impl From<Error> for JsonRpseeError {
	fn from(error: Error) -> Self {
		let message = error.to_string();
		let code = ErrorCode::from(error);
		JsonRpseeError::Call(CallError::Custom(ErrorObject::owned(
			code as i32,
			message,
			None::<()>,
		)))
	}
}

impl From<std::num::TryFromIntError> for Error {
	fn from(_error: std::num::TryFromIntError) -> Self {
		Error::VoterStateReportsUnreasonablyLargeNumbers
	}
}