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//! Ergo Merkle Tree and Merkle verification tools

// Coding conventions
#![forbid(unsafe_code)]
#![deny(non_upper_case_globals)]
#![deny(non_camel_case_types)]
#![deny(non_snake_case)]
#![deny(unused_mut)]
#![deny(dead_code)]
#![deny(unused_imports)]
#![deny(missing_docs)]
// Clippy exclusions
#![allow(clippy::unit_arg)]
#![deny(rustdoc::broken_intra_doc_links)]
#![deny(clippy::unwrap_used)]
#![deny(clippy::expect_used)]
#![deny(clippy::todo)]
#![deny(clippy::unimplemented)]
#![deny(clippy::panic)]

use blake2::digest::{Update, VariableOutput};
use blake2::VarBlake2b;

#[cfg(feature = "json")]
pub(crate) mod json;

// Unwrap is safe here since the hash is guaranteed to be 32 bytes
#[allow(clippy::unwrap_used)]
// Generates a hash of data prefixed with `prefix`
pub(crate) fn prefixed_hash(prefix: u8, data: &[u8]) -> Box<[u8; 32]> {
    let mut hasher = VarBlake2b::new(32).unwrap();
    hasher.update(&[prefix]);
    hasher.update(data);
    let hash = hasher.finalize_boxed();
    hash.try_into().unwrap()
}

pub(crate) fn concatenate_hashes(hash_a: &[u8; 32], hash_b: &[u8; 32]) -> [u8; 64] {
    let mut sum = [0; 64];
    sum[0..32].clone_from_slice(hash_a);
    sum[32..].clone_from_slice(hash_b);
    sum
}

mod merkleproof;

pub use merkleproof::*;