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pub use sp_multihash_derive::Multihash;

/// Default (cryptographically secure) Multihash implementation.
///
/// This is a default set of hashing algorithms. Usually applications would
/// use their own subset of algorithms. See the [`Multihash` derive] for more
/// information.
///
/// [`Multihash` derive]: crate::derive
#[derive(Copy, Clone, Debug, Eq, Multihash, PartialEq)]
#[mh(alloc_size = 64)]
pub enum Code {
  /// SHA-256 (32-byte hash size)
  #[cfg(feature = "sha2")]
  #[mh(code = 0x12, hasher = crate::Sha2_256, digest = crate::Sha2Digest<32>)]
  Sha2_256,
  /// SHA-512 (64-byte hash size)
  #[cfg(feature = "sha2")]
  #[mh(code = 0x13, hasher = crate::Sha2_512, digest = crate::Sha2Digest<64>)]
  Sha2_512,
  /// SHA3-224 (28-byte hash size)
  #[cfg(feature = "sha3")]
  #[mh(code = 0x17, hasher = crate::Sha3_224, digest = crate::Sha3Digest<28>)]
  Sha3_224,
  /// SHA3-256 (32-byte hash size)
  #[cfg(feature = "sha3")]
  #[mh(code = 0x16, hasher = crate::Sha3_256, digest = crate::Sha3Digest<32>)]
  Sha3_256,
  /// SHA3-384 (48-byte hash size)
  #[cfg(feature = "sha3")]
  #[mh(code = 0x15, hasher = crate::Sha3_384, digest = crate::Sha3Digest<48>)]
  Sha3_384,
  /// SHA3-512 (64-byte hash size)
  #[cfg(feature = "sha3")]
  #[mh(code = 0x14, hasher = crate::Sha3_512, digest = crate::Sha3Digest<64>)]
  Sha3_512,
  /// Keccak-224 (28-byte hash size)
  #[cfg(feature = "sha3")]
  #[mh(code = 0x1a, hasher = crate::Keccak224, digest =
 crate::KeccakDigest<28>)]
  Keccak224,
  /// Keccak-256 (32-byte hash size)
  #[cfg(feature = "sha3")]
  #[mh(code = 0x1b, hasher = crate::Keccak256, digest =
 crate::KeccakDigest<32>)]
  Keccak256,
  /// Keccak-384 (48-byte hash size)
  #[cfg(feature = "sha3")]
  #[mh(code = 0x1c, hasher = crate::Keccak384, digest =
 crate::KeccakDigest<48>)]
  Keccak384,
  /// Keccak-512 (64-byte hash size)
  #[cfg(feature = "sha3")]
  #[mh(code = 0x1d, hasher = crate::Keccak512, digest =
 crate::KeccakDigest<64>)]
  Keccak512,
  /// BLAKE2b-256 (32-byte hash size)
  #[cfg(feature = "blake2b")]
  #[mh(code = 0xb220, hasher = crate::Blake2b256, digest =
 crate::Blake2bDigest<32>)]
  Blake2b256,
  /// BLAKE2b-512 (64-byte hash size)
  #[cfg(feature = "blake2b")]
  #[mh(code = 0xb240, hasher = crate::Blake2b512, digest =
 crate::Blake2bDigest<64>)]
  Blake2b512,
  /// BLAKE2s-128 (16-byte hash size)
  #[cfg(feature = "blake2s")]
  #[mh(code = 0xb250, hasher = crate::Blake2s128, digest =
 crate::Blake2sDigest<16>)]
  Blake2s128,
  /// BLAKE2s-256 (32-byte hash size)
  #[cfg(feature = "blake2s")]
  #[mh(code = 0xb260, hasher = crate::Blake2s256, digest =
 crate::Blake2sDigest<32>)]
  Blake2s256,
  /// BLAKE3-256 (32-byte hash size)
  #[cfg(feature = "blake3")]
  #[mh(code = 0x1e, hasher = crate::Blake3_256, digest =
 crate::Blake3Digest<32>)]
  Blake3_256,

  // The following hashes are not cryptographically secure hashes and are not
  // enabled by default
  /// Identity hash (max. 64 bytes)
  #[cfg(feature = "identity")]
  #[mh(code = 0x00, hasher = crate::IdentityHasher::<64>, digest =
 crate::IdentityDigest<64>)]
  Identity,
}

#[cfg(test)]
mod tests {
  use super::*;
  use crate::{
    hasher::Hasher,
    hasher_impl::sha3::{
      Sha3_256,
      Sha3_512,
    },
    multihash::MultihashDigest,
  };

  #[test]
  fn test_hasher_256() {
    let digest = Sha3_256::digest(b"hello world");
    let hash = Code::multihash_from_digest(&digest);
    let hash2 = Code::Sha3_256.digest(b"hello world");
    assert_eq!(hash.code(), u64::from(Code::Sha3_256));
    assert_eq!(hash.size(), 32);
    assert_eq!(hash.digest(), digest.as_ref());
    assert_eq!(hash, hash2);
  }

  #[test]
  fn test_hasher_512() {
    let digest = Sha3_512::digest(b"hello world");
    let hash = Code::multihash_from_digest(&digest);
    let hash2 = Code::Sha3_512.digest(b"hello world");
    assert_eq!(hash.code(), u64::from(Code::Sha3_512));
    assert_eq!(hash.size(), 64);
    assert_eq!(hash.digest(), digest.as_ref());
    assert_eq!(hash, hash2);
  }
}