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// This file is part of Darwinia.
//
// Copyright (C) 2018-2022 Darwinia Network
// SPDX-License-Identifier: GPL-3.0
//
// Darwinia 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.
//
// Darwinia 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 Darwinia. If not, see <https://www.gnu.org/licenses/>.

use crate::{revert, EvmResult};
use ethabi::StateMutability;
use fp_evm::Context;
use sp_core::U256;

/// Check that a function call is compatible with the context it is
/// called into.
pub fn check_function_modifier(
	context: &Context,
	is_static: bool,
	modifier: StateMutability,
) -> EvmResult {
	if is_static && modifier != StateMutability::View {
		return Err(revert("can't call non-static function in static context"));
	}

	if modifier != StateMutability::Payable && context.apparent_value > U256::zero() {
		return Err(revert("function is not payable"));
	}

	Ok(())
}