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// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
// This file is part of Frontier.
//
// Copyright (c) 2019-2022 Moonsong Labs.
// Copyright (c) 2023 Parity Technologies (UK) Ltd.
//
// 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 crate::EvmResult;
use pallet_evm::{Log, PrecompileHandle};
use sp_core::{H160, H256};
use sp_std::{vec, vec::Vec};

/// Create a 0-topic log.
#[must_use]
pub fn log0(address: impl Into<H160>, data: impl Into<Vec<u8>>) -> Log {
	Log {
		address: address.into(),
		topics: vec![],
		data: data.into(),
	}
}

/// Create a 1-topic log.
#[must_use]
pub fn log1(address: impl Into<H160>, topic0: impl Into<H256>, data: impl Into<Vec<u8>>) -> Log {
	Log {
		address: address.into(),
		topics: vec![topic0.into()],
		data: data.into(),
	}
}

/// Create a 2-topics log.
#[must_use]
pub fn log2(
	address: impl Into<H160>,
	topic0: impl Into<H256>,
	topic1: impl Into<H256>,
	data: impl Into<Vec<u8>>,
) -> Log {
	Log {
		address: address.into(),
		topics: vec![topic0.into(), topic1.into()],
		data: data.into(),
	}
}

/// Create a 3-topics log.
#[must_use]
pub fn log3(
	address: impl Into<H160>,
	topic0: impl Into<H256>,
	topic1: impl Into<H256>,
	topic2: impl Into<H256>,
	data: impl Into<Vec<u8>>,
) -> Log {
	Log {
		address: address.into(),
		topics: vec![topic0.into(), topic1.into(), topic2.into()],
		data: data.into(),
	}
}

/// Create a 4-topics log.
#[must_use]
pub fn log4(
	address: impl Into<H160>,
	topic0: impl Into<H256>,
	topic1: impl Into<H256>,
	topic2: impl Into<H256>,
	topic3: impl Into<H256>,
	data: impl Into<Vec<u8>>,
) -> Log {
	Log {
		address: address.into(),
		topics: vec![topic0.into(), topic1.into(), topic2.into(), topic3.into()],
		data: data.into(),
	}
}

/// Extension trait allowing to record logs into a PrecompileHandle.
pub trait LogExt {
	fn record(self, handle: &mut impl PrecompileHandle) -> EvmResult;

	fn compute_cost(&self) -> EvmResult<u64>;
}

impl LogExt for Log {
	fn record(self, handle: &mut impl PrecompileHandle) -> EvmResult {
		handle.log(self.address, self.topics, self.data)?;
		Ok(())
	}

	fn compute_cost(&self) -> EvmResult<u64> {
		crate::evm::costs::log_costs(self.topics.len(), self.data.len())
	}
}