// Copyright 2015-2019 Parity Technologies (UK) Ltd.
// This file is part of Parity Ethereum.

// Parity Ethereum 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.

// Parity Ethereum 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 Parity Ethereum.  If not, see <http://www.gnu.org/licenses/>.

//! Bridge between Tracedb and Blockchain.

use blockchain::{BlockChain, BlockProvider, TransactionAddress};
use ethereum_types::H256;
use trace::DatabaseExtras as TraceDatabaseExtras;
use types::BlockNumber;

impl TraceDatabaseExtras for BlockChain {
    fn block_hash(&self, block_number: BlockNumber) -> Option<H256> {
        (self as &dyn BlockProvider).block_hash(block_number)
    }

    fn transaction_hash(&self, block_number: BlockNumber, tx_position: usize) -> Option<H256> {
        (self as &dyn BlockProvider)
            .block_hash(block_number)
            .and_then(|block_hash| {
                let tx_address = TransactionAddress {
                    block_hash: block_hash,
                    index: tx_position,
                };
                self.transaction(&tx_address)
            })
            .map(|tx| tx.hash())
    }
}