// Copyright 2025. The Tari Project
//
// Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
// following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
// disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
// following disclaimer in the documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
// products derived from this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

use blake2::Blake2b;
use digest::{FixedOutput, consts::U32};
use jmt::SimpleHasher;
use tari_crypto::{
    hash_domain,
    hashing::{AsFixedBytes, DomainSeparatedHasher},
};

use crate::ValidatorNodeMerkleHasherBlake256;

hash_domain!(OutputSmtHashDomain, "com.tari.base_layer.core.output_smt", 1);
pub type OutputSmtHasherBlake256 = DomainSeparatedHasher<Blake2b<U32>, OutputSmtHashDomain>;
pub struct SmtHasher {
    hasher: OutputSmtHasherBlake256,
}

impl SimpleHasher for SmtHasher {
    fn new() -> Self {
        Self {
            hasher: OutputSmtHasherBlake256::new(),
        }
    }

    fn update(&mut self, data: &[u8]) {
        self.hasher.update(data);
    }

    fn finalize(self) -> [u8; 32] {
        self.hasher.finalize().as_fixed_bytes().expect("Hash is 32 bytes")
    }
}

pub struct ValidatorNodeJmtHasher {
    hasher: ValidatorNodeMerkleHasherBlake256,
}

impl SimpleHasher for ValidatorNodeJmtHasher {
    fn new() -> Self {
        Self {
            hasher: ValidatorNodeMerkleHasherBlake256::new(),
        }
    }

    fn update(&mut self, data: &[u8]) {
        self.hasher.update(data);
    }

    fn finalize(self) -> [u8; 32] {
        self.hasher.finalize_fixed().into()
    }
}
