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// Copyright 2015-2020 Parity Technologies (UK) Ltd.
// This file is part of OpenEthereum.

// OpenEthereum 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.

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

//! Generates Keccak-flavoured trie roots.

extern crate ethereum_types;
extern crate keccak_hasher;
extern crate triehash;

use ethereum_types::H256;
use keccak_hasher::KeccakHasher;

/// Generates a trie root hash for a vector of key-value tuples
pub fn trie_root<I, K, V>(input: I) -> H256
where
    I: IntoIterator<Item = (K, V)>,
    K: AsRef<[u8]> + Ord,
    V: AsRef<[u8]>,
{
    triehash::trie_root::<KeccakHasher, _, _, _>(input)
}

/// Generates a key-hashed (secure) trie root hash for a vector of key-value tuples.
pub fn sec_trie_root<I, K, V>(input: I) -> H256
where
    I: IntoIterator<Item = (K, V)>,
    K: AsRef<[u8]>,
    V: AsRef<[u8]>,
{
    triehash::sec_trie_root::<KeccakHasher, _, _, _>(input)
}

/// Generates a trie root hash for a vector of values
pub fn ordered_trie_root<I, V>(input: I) -> H256
where
    I: IntoIterator<Item = V>,
    V: AsRef<[u8]>,
{
    triehash::ordered_trie_root::<KeccakHasher, I>(input)
}

#[cfg(test)]
mod tests {
    use super::{ordered_trie_root, sec_trie_root, trie_root};
    use ethereum_types::H256;
    use keccak_hasher::KeccakHasher;
    use std::str::FromStr;
    use triehash;

    #[test]
    fn simple_test() {
        assert_eq!(
            trie_root(vec![(
                b"A",
                b"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" as &[u8]
            )]),
            H256::from_str("d23786fb4a010da3ce639d66d5e904a11dbc02746d1ce25029e53290cabf28ab")
                .unwrap()
        );
    }

    #[test]
    fn proxy_works() {
        let input = vec![(
            b"A",
            b"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" as &[u8],
        )];
        assert_eq!(
            trie_root(input.clone()),
            triehash::trie_root::<KeccakHasher, _, _, _>(input.clone())
        );

        assert_eq!(
            sec_trie_root(input.clone()),
            triehash::sec_trie_root::<KeccakHasher, _, _, _>(input.clone())
        );

        let data = &["cake", "pie", "candy"];
        assert_eq!(
            ordered_trie_root(data),
            triehash::ordered_trie_root::<KeccakHasher, _>(data)
        );
    }
}