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// Copyright 2019 Stichting Organism
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/// Repub bytes
pub use bytes;
/// base58
pub mod base58;
/// To & From Hex
pub mod hex;
/// Serilization
pub mod ser;
/// Parking Lot backed Sync Primitives
pub mod sync;
/// 64bit Time handling
pub mod tai64;
/// Repub Byteorder
pub use byteorder;
/// Keccak-f sponge function
pub mod sponge;
/// Variable Encoding Integer
mod varint;
pub use varint::VarInt;
/// Export Curve
pub use curve25519_dalek as dalek;
/// Various Hash functions & types
pub mod hash;
/// Export blake2b
pub use blake2b_simd as blake2;
/// Method to calculate a root of a list of items
mod fast_merkle_root;
/// That extra sauce
pub mod tools;
pub use fast_merkle_root::fast_merkle_root;


#[macro_use] extern crate uint;

construct_uint! {
    pub struct U256(4);
}

mod fisher_yates;
pub use fisher_yates::fisher_yates;

//
// - Jeffrey Burdges <jeff@web3.foundation>
//

/// A hack function to use zeroize
#[inline(always)]
pub fn zeroize_hack<Z: Default>(z: &mut Z) {
    use core::{ptr, sync::atomic};
    unsafe {
        ptr::write_volatile(z, Z::default());
    }
    atomic::compiler_fence(atomic::Ordering::SeqCst);
}

#[cfg(all(feature = "rand_os", feature = "rand"))]
pub fn mohan_rand() -> impl rand::RngCore + rand::CryptoRng {
    ::rand::thread_rng()
}

#[cfg(all(feature = "rand_os", not(feature = "rand")))]
pub fn mohan_rand() -> impl rand_core::RngCore + rand_core::CryptoRng {
    ::rand_core::OsRng::new()
}

#[cfg(not(feature = "rand"))]
pub fn mohan_rand() -> impl rand_core::RngCore + rand_core::CryptoRng {
    const PRM: &'static str = "Attempted to use functionality that requires system randomness!!";

    struct PanicRng;
    impl ::rand_core::RngCore for PanicRng {
        fn next_u32(&mut self) -> u32 {
            panic!(&PRM)
        }
        fn next_u64(&mut self) -> u64 {
            panic!(&PRM)
        }
        fn fill_bytes(&mut self, _dest: &mut [u8]) {
            panic!(&PRM)
        }
        fn try_fill_bytes(&mut self, _dest: &mut [u8]) -> Result<(), ::rand_core::Error> {
            panic!(&PRM)
        }
    }
    impl ::rand_core::CryptoRng for PanicRng {}

    PanicRng
}