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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
//
// Copyright (c) DUSK NETWORK. All rights reserved.

use blake2b_simd::{Params, State as Blake2bState};

use crate::{IdBuilder, Ident};
use core::fmt;

/// A 32 byte Identifier based on the Blake2b hash algorithm
#[derive(Hash, PartialEq, Eq, Copy, Default, Clone)]
pub struct Id32([u8; 32]);

impl fmt::Debug for Id32 {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        for byte in &self.0 {
            write!(f, "{:02x}", byte)?
        }
        Ok(())
    }
}

pub struct Id32Builder(Blake2bState);

impl Default for Id32Builder {
    fn default() -> Self {
        Id32Builder(Params::new().hash_length(32).to_state())
    }
}

impl IdBuilder<Id32> for Id32Builder {
    fn write_bytes(&mut self, bytes: &[u8]) {
        self.0.update(bytes);
    }

    fn fin(mut self) -> Id32 {
        let mut bytes = [0u8; 32];
        bytes.copy_from_slice(self.0.finalize().as_ref());
        Id32(bytes)
    }
}

impl Ident for Id32 {
    type Builder = Id32Builder;
}

impl AsRef<[u8]> for Id32 {
    fn as_ref(&self) -> &[u8] {
        &self.0
    }
}

impl AsMut<[u8]> for Id32 {
    fn as_mut(&mut self) -> &mut [u8] {
        &mut self.0
    }
}