//! Random oracle input structures and algorithms
//!
//! Definition of random oracle input structure and
//! methods for serializing into bytes and field elements

use bitvec::{prelude::*, view::AsBits};

use ark_ff::PrimeField;
use mina_curves::pasta::{Fp, Fq};
use o1_utils::FieldHelpers;

use super::Hashable;

/// Random oracle input structure
///
/// The random oracle input encapsulates the serialization format and methods using during hashing.
///
/// When implementing the [`Hashable`] trait to enable hashing for a type, you must implement
/// its `to_roinput()` serialization method using the [`ROInput`] functions below.
///
/// The random oracle input structure is used (by generic code) to serialize the object into
/// both a vector of `pasta::Fp` field elements and into a vector of bytes, depending on the situation.
///
/// Here is an example of how `ROInput` is used during the definition of the `Hashable` trait.
///
/// ```rust
/// use mina_hasher::{Hashable, ROInput};
/// use mina_curves::pasta::Fp;
///
/// #[derive(Clone)]
/// pub struct MyExample {
///     pub x: Fp,
///     pub y: Fp,
///     pub nonce: u64,
/// }
///
/// impl Hashable for MyExample {
///     type D = ();
///
///     fn to_roinput(&self) -> ROInput {
///         ROInput::new()
///             .append_field(self.x)
///             .append_field(self.y)
///             .append_u64(self.nonce)
///     }
///
///     fn domain_string(_: Self::D) -> Option<String> {
///         format!("MyExampleMainnet").into()
///     }
/// }
/// ```
/// **Details:** For technical reasons related to our proof system and performance,
/// non-field-element members are serialized for signing differently than other types.
/// Additionally, during signing all members of the random oracle input get serialized
/// together in two different ways: both as *bytes* and as a vector of *field elements*.
/// The random oracle input automates and encapsulates this complexity.
#[derive(Default, Debug, Clone, PartialEq, Eq)]
pub struct ROInput {
    fields: Vec<Fp>,
    bits: BitVec<u8>,
}

impl ROInput {
    /// Create a new empty random oracle input
    pub fn new() -> Self {
        ROInput {
            fields: vec![],
            bits: BitVec::new(),
        }
    }

    /// Append a `Hashable` input
    pub fn append_hashable(self, input: &impl Hashable) -> Self {
        self.append_roinput(input.to_roinput())
    }

    /// Append another random oracle input
    pub fn append_roinput(mut self, mut roi: ROInput) -> Self {
        self.fields.append(&mut roi.fields);
        self.bits.extend(roi.bits);
        self
    }

    /// Append a base field element
    pub fn append_field(mut self, f: Fp) -> Self {
        self.fields.push(f);
        self
    }

    /// Append a scalar field element
    pub fn append_scalar(mut self, s: Fq) -> Self {
        // mina scalars are 255 bytes
        let bytes = s.to_bytes();
        let bits = &bytes.as_bits::<Lsb0>()[..Fq::MODULUS_BIT_SIZE as usize];
        self.bits.extend(bits);
        self
    }

    /// Append a single bit
    pub fn append_bool(mut self, b: bool) -> Self {
        self.bits.push(b);
        self
    }

    /// Append bytes
    pub fn append_bytes(mut self, bytes: &[u8]) -> Self {
        self.bits.extend_from_bitslice(bytes.as_bits::<Lsb0>());
        self
    }

    /// Append a 32-bit unsigned integer
    pub fn append_u32(self, x: u32) -> Self {
        self.append_bytes(&x.to_le_bytes())
    }

    /// Append a 64-bit unsigned integer
    pub fn append_u64(self, x: u64) -> Self {
        self.append_bytes(&x.to_le_bytes())
    }

    /// Serialize random oracle input to bytes
    pub fn to_bytes(&self) -> Vec<u8> {
        let mut bits: BitVec<u8> = self.fields.iter().fold(BitVec::new(), |mut acc, fe| {
            acc.extend_from_bitslice(
                &fe.to_bytes().as_bits::<Lsb0>()[..Fp::MODULUS_BIT_SIZE as usize],
            );

            acc
        });

        bits.extend(&self.bits);

        bits.into()
    }

    /// Serialize random oracle input to vector of base field elements
    pub fn to_fields(&self) -> Vec<Fp> {
        let mut fields: Vec<Fp> = self.fields.clone();

        let bits_as_fields =
            self.bits
                .chunks(Fp::MODULUS_BIT_SIZE as usize - 1)
                .fold(vec![], |mut acc, chunk| {
                    // Workaround: chunk.clone() does not appear to respect
                    // the chunk's boundaries when it's not byte-aligned.
                    //
                    // That is,
                    //
                    //   let mut bv = chunk.clone().to_bitvec();
                    //   bv.resize(B::size_in_bits(), false);
                    //   fields.push(B::from_bytes(bv.into()));
                    //
                    // doesn't work.
                    //
                    // Instead we must do

                    let mut bv = BitVec::<u8>::new();
                    bv.resize(chunk.len(), false);
                    bv.clone_from_bitslice(chunk);

                    // extend to the size of a field;
                    bv.resize(Fp::MODULUS_BIT_SIZE as usize, false);

                    acc.push(
                        Fp::from_bytes(&bv.into_vec())
                            .expect("failed to create base field element"),
                    );

                    acc
                });

        fields.extend(bits_as_fields);

        fields
    }
}

#[cfg(test)]
mod tests {
    use crate::Hashable;

    use super::*;

    #[test]
    fn append_bool() {
        let roi = ROInput::new().append_bool(true);
        assert!(roi.bits.len() == 1);
        assert!(roi.bits.as_raw_slice() == [0x01]);
    }

    #[test]
    fn append_two_bits() {
        let roi = ROInput::new().append_bool(false).append_bool(true);
        assert!(roi.bits.len() == 2);
        assert!(roi.bits.as_raw_slice() == [0x02]);
    }

    #[test]
    fn append_five_bits() {
        let roi = ROInput::new()
            .append_bool(false)
            .append_bool(true)
            .append_bool(false)
            .append_bool(false)
            .append_bool(true);
        assert!(roi.bits.len() == 5);
        assert!(roi.bits.as_raw_slice() == [0x12]);
    }

    #[test]
    fn append_byte() {
        let roi = ROInput::new().append_bytes(&[0x01]);
        assert!(roi.bits.len() == 8);
        assert!(roi.bits.as_raw_slice() == [0x01]);
    }

    #[test]
    fn append_two_bytes() {
        let roi = ROInput::new().append_bytes(&[0x10, 0xac]);
        assert!(roi.bits.len() == 16);
        assert!(roi.bits.as_raw_slice() == [0x10, 0xac]);
    }

    #[test]
    fn append_five_bytes() {
        let roi = ROInput::new().append_bytes(&[0x10, 0xac, 0x01, 0xeb, 0xca]);
        assert!(roi.bits.len() == 40);
        assert!(roi.bits.as_raw_slice() == [0x10, 0xac, 0x01, 0xeb, 0xca]);
    }

    #[test]
    fn append_scalar() {
        let scalar =
            Fq::from_hex("18b7ef420128e69623c0c0dcfa28d47a029d462720deb769d7b5dd6f17444216")
                .expect("failed to create scalar");
        let roi = ROInput::new().append_scalar(scalar);
        assert_eq!(roi.bits.len(), 255);
        assert_eq!(
            roi.bits.as_raw_slice(),
            [
                0x18, 0xb7, 0xef, 0x42, 0x01, 0x28, 0xe6, 0x96, 0x23, 0xc0, 0xc0, 0xdc, 0xfa, 0x28,
                0xd4, 0x7a, 0x02, 0x9d, 0x46, 0x27, 0x20, 0xde, 0xb7, 0x69, 0xd7, 0xb5, 0xdd, 0x6f,
                0x17, 0x44, 0x42, 0x16
            ]
        );
        assert_eq!(
            roi.to_bytes(),
            [
                0x18, 0xb7, 0xef, 0x42, 0x01, 0x28, 0xe6, 0x96, 0x23, 0xc0, 0xc0, 0xdc, 0xfa, 0x28,
                0xd4, 0x7a, 0x02, 0x9d, 0x46, 0x27, 0x20, 0xde, 0xb7, 0x69, 0xd7, 0xb5, 0xdd, 0x6f,
                0x17, 0x44, 0x42, 0x16
            ]
        );
    }

    #[test]
    fn append_scalar_and_byte() {
        let scalar =
            Fq::from_hex("18b7ef420128e69623c0c0dcfa28d47a029d462720deb769d7b5dd6f17444216")
                .expect("failed to create scalar");
        let roi = ROInput::new().append_scalar(scalar).append_bytes(&[0x01]);
        assert!(roi.bits.len() == 263);
        assert!(
            roi.bits.as_raw_slice()
                == [
                    0x18, 0xb7, 0xef, 0x42, 0x01, 0x28, 0xe6, 0x96, 0x23, 0xc0, 0xc0, 0xdc, 0xfa,
                    0x28, 0xd4, 0x7a, 0x02, 0x9d, 0x46, 0x27, 0x20, 0xde, 0xb7, 0x69, 0xd7, 0xb5,
                    0xdd, 0x6f, 0x17, 0x44, 0x42, 0x96, 0x00
                ]
        );
    }

    #[test]
    fn append_two_scalars() {
        let scalar1 =
            Fq::from_hex("18b7ef420128e69623c0c0dcfa28d47a029d462720deb769d7b5dd6f17444216")
                .expect("failed to create scalar");
        let scalar2 =
            Fq::from_hex("a1b1e948835be341277548134e0effabdbcb95b742e8c5e967e9bf13eb4ae805")
                .expect("failed to create scalar");
        let roi = ROInput::new().append_scalar(scalar1).append_scalar(scalar2);
        assert!(roi.bits.len() == 510);
        assert!(
            roi.bits.as_raw_slice()
                == [
                    0x18, 0xb7, 0xef, 0x42, 0x01, 0x28, 0xe6, 0x96, 0x23, 0xc0, 0xc0, 0xdc, 0xfa,
                    0x28, 0xd4, 0x7a, 0x02, 0x9d, 0x46, 0x27, 0x20, 0xde, 0xb7, 0x69, 0xd7, 0xb5,
                    0xdd, 0x6f, 0x17, 0x44, 0x42, 0x96, 0xd0, 0xd8, 0x74, 0xa4, 0xc1, 0xad, 0xf1,
                    0xa0, 0x93, 0x3a, 0xa4, 0x09, 0x27, 0x87, 0xff, 0xd5, 0xed, 0xe5, 0xca, 0x5b,
                    0x21, 0xf4, 0xe2, 0xf4, 0xb3, 0xf4, 0xdf, 0x89, 0x75, 0x25, 0xf4, 0x02
                ]
        );
    }

    #[test]
    fn append_two_scalars_and_byte() {
        let scalar1 =
            Fq::from_hex("60db6f4f5b8ce1c7cb747fba9e324cc3268c7a6e3f43cd82d451ae99a7b2bd1f")
                .expect("failed to create scalar");
        let scalar2 =
            Fq::from_hex("fe7775b106bceb58f3e23e5a4eb99f404b8ed8cf2afeef9c9d1800f12138cd07")
                .expect("failed to create scalar");
        let roi = ROInput::new()
            .append_scalar(scalar1)
            .append_bytes(&[0x2a])
            .append_scalar(scalar2);
        assert!(roi.bits.len() == 518);
        assert!(
            roi.bits.as_raw_slice()
                == [
                    0x60, 0xdb, 0x6f, 0x4f, 0x5b, 0x8c, 0xe1, 0xc7, 0xcb, 0x74, 0x7f, 0xba, 0x9e,
                    0x32, 0x4c, 0xc3, 0x26, 0x8c, 0x7a, 0x6e, 0x3f, 0x43, 0xcd, 0x82, 0xd4, 0x51,
                    0xae, 0x99, 0xa7, 0xb2, 0xbd, 0x1f, 0x15, 0xff, 0xbb, 0xba, 0x58, 0x03, 0xde,
                    0x75, 0xac, 0x79, 0x71, 0x1f, 0x2d, 0xa7, 0xdc, 0x4f, 0xa0, 0x25, 0x47, 0xec,
                    0x67, 0x15, 0xff, 0x77, 0xce, 0x4e, 0x0c, 0x80, 0xf8, 0x10, 0x9c, 0xe6, 0x03
                ]
        );
    }

    #[test]
    fn append_u32() {
        let roi = ROInput::new().append_u32(1984u32);
        assert!(roi.bits.len() == 32);
        assert!(roi.bits.as_raw_slice() == [0xc0, 0x07, 0x00, 0x00]);
    }

    #[test]
    fn append_two_u32_and_bit() {
        let roi = ROInput::new()
            .append_u32(1729u32)
            .append_bool(false)
            .append_u32(u32::MAX);
        assert!(roi.bits.len() == 65);
        assert!(roi.bits.as_raw_slice() == [0xc1, 0x06, 0x00, 0x00, 0xfe, 0xff, 0xff, 0xff, 0x01]);
    }

    #[test]
    fn append_u64() {
        let roi = ROInput::new().append_u64(6174u64);
        assert!(roi.bits.len() == 64);
        assert!(roi.bits.as_raw_slice() == [0x1e, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00]);
    }

    #[test]
    fn append_two_u64_and_bits() {
        let roi = ROInput::new()
            .append_bool(true)
            .append_u64(u64::MAX / 6174u64)
            .append_bool(false)
            .append_u64(u64::MAX / 1111u64);
        assert!(roi.bits.len() == 130);
        assert!(
            roi.bits.as_raw_slice()
                == [
                    0xe1, 0x29, 0x89, 0xd6, 0xcb, 0x3a, 0x15, 0x00, 0x08, 0x17, 0xc4, 0x9b, 0x04,
                    0xf4, 0xeb, 0x00, 0x00
                ]
        );
    }

    #[test]
    fn all_1() {
        let roi = ROInput::new()
            .append_bool(true)
            .append_scalar(
                Fq::from_hex("01d1755db21c8cd2a9cf5a3436178da3d70f484cd4b4c8834b799921e7d7a102")
                    .expect("failed to create scalar"),
            )
            .append_u64(18446744073709551557)
            .append_bytes(&[0xba, 0xdc, 0x0f, 0xfe])
            .append_scalar(
                Fq::from_hex("e70187e9b125524489d0433da76fd8287fa652eaebde147b45fa0cd86f171810")
                    .expect("failed to create scalar"),
            )
            .append_bool(false)
            .append_u32(2147483647)
            .append_bool(true);

        assert!(roi.bits.len() == 641);
        assert!(
            roi.bits.as_raw_slice()
                == [
                    0x03, 0xa2, 0xeb, 0xba, 0x64, 0x39, 0x18, 0xa5, 0x53, 0x9f, 0xb5, 0x68, 0x6c,
                    0x2e, 0x1a, 0x47, 0xaf, 0x1f, 0x90, 0x98, 0xa8, 0x69, 0x91, 0x07, 0x97, 0xf2,
                    0x32, 0x43, 0xce, 0xaf, 0x43, 0x05, 0xc5, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
                    0xff, 0xba, 0xdc, 0x0f, 0xfe, 0xe7, 0x01, 0x87, 0xe9, 0xb1, 0x25, 0x52, 0x44,
                    0x89, 0xd0, 0x43, 0x3d, 0xa7, 0x6f, 0xd8, 0x28, 0x7f, 0xa6, 0x52, 0xea, 0xeb,
                    0xde, 0x14, 0x7b, 0x45, 0xfa, 0x0c, 0xd8, 0x6f, 0x17, 0x18, 0x10, 0xff, 0xff,
                    0xff, 0x7f, 0x01
                ]
        );
    }

    #[test]
    fn transaction_bits() {
        let roi = ROInput::new()
            .append_u64(1000000) // fee
            .append_u64(1) // fee token
            .append_bool(true) // fee payer pk odd
            .append_u32(0) // nonce
            .append_u32(u32::MAX) // valid_until
            .append_bytes(&[0; 34]) // memo
            .append_bool(false) // tags[0]
            .append_bool(false) // tags[1]
            .append_bool(false) // tags[2]
            .append_bool(true) // sender pk odd
            .append_bool(false) // receiver pk odd
            .append_u64(1) // token_id
            .append_u64(10000000000) // amount
            .append_bool(false) // token_locked
            .append_scalar(
                Fq::from_hex("de217a3017ca0b7a278e75f63c09890e3894be532d8dbadd30a7d450055f6d2d")
                    .expect("failed to create scalar"),
            )
            .append_bytes(&[0x01]);
        assert_eq!(roi.bits.len(), 862);
        assert_eq!(
            roi.bits.as_raw_slice(),
            [
                0x40, 0x42, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0xfe, 0xff, 0xff, 0xff, 0x01, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf9, 0x02,
                0x95, 0x00, 0x00, 0x00, 0x00, 0xef, 0x10, 0x3d, 0x98, 0x0b, 0xe5, 0x05, 0xbd, 0x13,
                0xc7, 0x3a, 0x7b, 0x9e, 0x84, 0x44, 0x07, 0x1c, 0x4a, 0xdf, 0xa9, 0x96, 0x46, 0xdd,
                0x6e, 0x98, 0x53, 0x6a, 0xa8, 0x82, 0xaf, 0xb6, 0x56, 0x00
            ]
        )
    }

    #[test]
    fn append_field() {
        let roi = ROInput::new().append_field(
            Fp::from_hex("2eaedae42a7461d5952d27b97ecad068b698ebb94e8a0e4c45388bb613de7e08")
                .expect("failed to create field"),
        );

        assert_eq!(
            roi.to_bytes(),
            [
                0x2e, 0xae, 0xda, 0xe4, 0x2a, 0x74, 0x61, 0xd5, 0x95, 0x2d, 0x27, 0xb9, 0x7e, 0xca,
                0xd0, 0x68, 0xb6, 0x98, 0xeb, 0xb9, 0x4e, 0x8a, 0x0e, 0x4c, 0x45, 0x38, 0x8b, 0xb6,
                0x13, 0xde, 0x7e, 0x08
            ]
        );
    }

    #[test]
    fn append_two_fields() {
        let roi = ROInput::new()
            .append_field(
                Fp::from_hex("0cdaf334e9632268a5aa959c2781fb32bf45565fe244ae42c849d3fdc7c6441d")
                    .expect("failed to create field"),
            )
            .append_field(
                Fp::from_hex("2eaedae42a7461d5952d27b97ecad068b698ebb94e8a0e4c45388bb613de7e08")
                    .expect("failed to create field"),
            );

        assert_eq!(
            roi.to_bytes(),
            [
                0x0c, 0xda, 0xf3, 0x34, 0xe9, 0x63, 0x22, 0x68, 0xa5, 0xaa, 0x95, 0x9c, 0x27, 0x81,
                0xfb, 0x32, 0xbf, 0x45, 0x56, 0x5f, 0xe2, 0x44, 0xae, 0x42, 0xc8, 0x49, 0xd3, 0xfd,
                0xc7, 0xc6, 0x44, 0x1d, 0x17, 0x57, 0x6d, 0x72, 0x15, 0xba, 0xb0, 0xea, 0xca, 0x96,
                0x93, 0x5c, 0x3f, 0x65, 0x68, 0x34, 0x5b, 0xcc, 0xf5, 0x5c, 0x27, 0x45, 0x07, 0xa6,
                0x22, 0x9c, 0x45, 0xdb, 0x09, 0x6f, 0x3f, 0x04
            ]
        );
    }

    #[test]
    fn append_three_fields() {
        let roi = ROInput::new()
            .append_field(
                Fp::from_hex("1f3f142986041b54427aa2032632e34df2fa9bde9bce70c04c5034266619e529")
                    .expect("failed to create field"),
            )
            .append_field(
                Fp::from_hex("37f4433b85e753a91a1d79751645f1448954c433f9492e36a933ca7f3df61a04")
                    .expect("failed to create field"),
            )
            .append_field(
                Fp::from_hex("6cf4772d3e1aab98a2b514b73a4f6e0df1fb4f703ecfa762196b22c26da4341c")
                    .expect("failed to create field"),
            );

        assert_eq!(
            roi.to_bytes(),
            [
                0x1f, 0x3f, 0x14, 0x29, 0x86, 0x04, 0x1b, 0x54, 0x42, 0x7a, 0xa2, 0x03, 0x26, 0x32,
                0xe3, 0x4d, 0xf2, 0xfa, 0x9b, 0xde, 0x9b, 0xce, 0x70, 0xc0, 0x4c, 0x50, 0x34, 0x26,
                0x66, 0x19, 0xe5, 0xa9, 0x1b, 0xfa, 0xa1, 0x9d, 0xc2, 0xf3, 0xa9, 0x54, 0x8d, 0x8e,
                0xbc, 0x3a, 0x8b, 0xa2, 0x78, 0xa2, 0x44, 0x2a, 0xe2, 0x99, 0xfc, 0x24, 0x17, 0x9b,
                0xd4, 0x19, 0xe5, 0xbf, 0x1e, 0x7b, 0x0d, 0x02, 0x1b, 0xfd, 0x5d, 0x8b, 0x8f, 0xc6,
                0x2a, 0xa6, 0x68, 0x2d, 0xc5, 0xad, 0xce, 0x93, 0x5b, 0x43, 0xfc, 0xfe, 0x13, 0x9c,
                0xcf, 0xf3, 0xa9, 0x58, 0xc6, 0x9a, 0x88, 0x70, 0x1b, 0x29, 0x0d, 0x07
            ]
        );
    }

    #[test]
    fn append_field_and_scalar() {
        let roi = ROInput::new()
            .append_field(
                Fp::from_hex("64cde530327a36fcb88b6d769adca9b7c5d266e7d0042482203f3fd3a0d71721")
                    .expect("failed to create field"),
            )
            .append_scalar(
                Fq::from_hex("604355d0daa455db783fd7ee11c5bd9b04d67ba64c27c95bef95e379f98c6432")
                    .expect("failed to create scalar"),
            );

        assert_eq!(
            roi.to_bytes(),
            [
                0x64, 0xcd, 0xe5, 0x30, 0x32, 0x7a, 0x36, 0xfc, 0xb8, 0x8b, 0x6d, 0x76, 0x9a, 0xdc,
                0xa9, 0xb7, 0xc5, 0xd2, 0x66, 0xe7, 0xd0, 0x04, 0x24, 0x82, 0x20, 0x3f, 0x3f, 0xd3,
                0xa0, 0xd7, 0x17, 0x21, 0xb0, 0xa1, 0x2a, 0x68, 0x6d, 0xd2, 0xaa, 0x6d, 0xbc, 0x9f,
                0x6b, 0xf7, 0x88, 0xe2, 0xde, 0x4d, 0x02, 0xeb, 0x3d, 0x53, 0xa6, 0x93, 0xe4, 0xad,
                0xf7, 0xca, 0xf1, 0xbc, 0x7c, 0x46, 0x32, 0x19
            ]
        );
    }

    #[test]
    fn append_field_bit_and_scalar() {
        let roi = ROInput::new()
            .append_field(
                Fp::from_hex("d897c7a8b811d8acd3eeaa4adf42292802eed80031c2ad7c8989aea1fe94322c")
                    .expect("failed to create field"),
            )
            .append_bool(false)
            .append_scalar(
                Fq::from_hex("79586cc6b8b53c8991b2abe0ca76508f056ca50f06836ce4d818c2ff73d42b28")
                    .expect("failed to create scalar"),
            );

        assert_eq!(
            roi.to_bytes(),
            [
                0xd8, 0x97, 0xc7, 0xa8, 0xb8, 0x11, 0xd8, 0xac, 0xd3, 0xee, 0xaa, 0x4a, 0xdf, 0x42,
                0x29, 0x28, 0x02, 0xee, 0xd8, 0x00, 0x31, 0xc2, 0xad, 0x7c, 0x89, 0x89, 0xae, 0xa1,
                0xfe, 0x94, 0x32, 0x2c, 0x79, 0x58, 0x6c, 0xc6, 0xb8, 0xb5, 0x3c, 0x89, 0x91, 0xb2,
                0xab, 0xe0, 0xca, 0x76, 0x50, 0x8f, 0x05, 0x6c, 0xa5, 0x0f, 0x06, 0x83, 0x6c, 0xe4,
                0xd8, 0x18, 0xc2, 0xff, 0x73, 0xd4, 0x2b, 0x28
            ]
        );
    }

    #[test]
    fn to_bytes() {
        let roi = ROInput::new()
            .append_field(
                Fp::from_hex("a5984f2bd00906f9a86e75bfb4b2c3625f1a0d1cfacc1501e8e82ae7041efc14")
                    .expect("failed to create field"),
            )
            .append_field(
                Fp::from_hex("8af0bc770d49a5b9fcabfcdd033bab470b2a211ef80b710efe71315cfa818c0a")
                    .expect("failed to create field"),
            )
            .append_bool(false)
            .append_u32(314u32)
            .append_scalar(
                Fq::from_hex("c23c43a23ddc1516578b0f0d81b93cdbbc97744acc697cfc8c5dfd01cc448323")
                    .expect("failed to create scalar"),
            );

        assert_eq!(
            roi.to_bytes(),
            [
                0xa5, 0x98, 0x4f, 0x2b, 0xd0, 0x09, 0x06, 0xf9, 0xa8, 0x6e, 0x75, 0xbf, 0xb4, 0xb2,
                0xc3, 0x62, 0x5f, 0x1a, 0x0d, 0x1c, 0xfa, 0xcc, 0x15, 0x01, 0xe8, 0xe8, 0x2a, 0xe7,
                0x04, 0x1e, 0xfc, 0x14, 0x45, 0x78, 0xde, 0xbb, 0x86, 0xa4, 0xd2, 0x5c, 0xfe, 0x55,
                0xfe, 0xee, 0x81, 0x9d, 0xd5, 0xa3, 0x05, 0x95, 0x10, 0x0f, 0xfc, 0x85, 0x38, 0x07,
                0xff, 0xb8, 0x18, 0x2e, 0xfd, 0x40, 0x46, 0x05, 0x9d, 0x00, 0x00, 0x00, 0x61, 0x9e,
                0x21, 0xd1, 0x1e, 0xee, 0x0a, 0x8b, 0xab, 0xc5, 0x87, 0x86, 0xc0, 0x5c, 0x9e, 0x6d,
                0xde, 0x4b, 0x3a, 0x25, 0xe6, 0x34, 0x3e, 0x7e, 0xc6, 0xae, 0xfe, 0x00, 0x66, 0xa2,
                0xc1, 0x11
            ]
        );
    }

    #[test]
    fn to_fields_1_scalar() {
        let roi = ROInput::new().append_scalar(
            Fq::from_hex("5d496dd8ff63f640c006887098092b16bc8c78504f84fa1ee3a0b54f85f0a625")
                .expect("failed to create scalar"),
        );

        assert_eq!(
            roi.to_bytes(),
            [
                0x5d, 0x49, 0x6d, 0xd8, 0xff, 0x63, 0xf6, 0x40, 0xc0, 0x06, 0x88, 0x70, 0x98, 0x09,
                0x2b, 0x16, 0xbc, 0x8c, 0x78, 0x50, 0x4f, 0x84, 0xfa, 0x1e, 0xe3, 0xa0, 0xb5, 0x4f,
                0x85, 0xf0, 0xa6, 0x25
            ]
        );

        assert_eq!(
            roi.to_fields(),
            [
                Fp::from_hex("5d496dd8ff63f640c006887098092b16bc8c78504f84fa1ee3a0b54f85f0a625")
                    .expect("failed to create field"),
                Fp::from_hex("0000000000000000000000000000000000000000000000000000000000000000")
                    .expect("failed to create field"),
            ]
        );
    }

    #[test]
    fn to_fields_1_scalar_2_bits() {
        let roi = ROInput::new()
            .append_scalar(
                Fq::from_hex("e8a9961c8c417b0d0e3d7366f6b0e6ef90a6dad123070f715e8a9eaa02e47330")
                    .expect("failed to create scalar"),
            )
            .append_bool(false)
            .append_bool(true);

        assert_eq!(
            roi.to_bytes(),
            [
                0xe8, 0xa9, 0x96, 0x1c, 0x8c, 0x41, 0x7b, 0x0d, 0x0e, 0x3d, 0x73, 0x66, 0xf6, 0xb0,
                0xe6, 0xef, 0x90, 0xa6, 0xda, 0xd1, 0x23, 0x07, 0x0f, 0x71, 0x5e, 0x8a, 0x9e, 0xaa,
                0x02, 0xe4, 0x73, 0x30, 0x01
            ]
        );

        assert_eq!(
            roi.to_fields(),
            [
                Fp::from_hex("e8a9961c8c417b0d0e3d7366f6b0e6ef90a6dad123070f715e8a9eaa02e47330")
                    .expect("failed to create field"),
                Fp::from_hex("0400000000000000000000000000000000000000000000000000000000000000")
                    .expect("failed to create field"),
            ]
        );
    }

    #[test]
    fn to_fields_2_scalars() {
        let roi = ROInput::new()
            .append_scalar(
                Fq::from_hex("e05c25d2c17ec20d6bc8fd21204af52808451076cff687407164a21d352ddd22")
                    .expect("failed to create scalar"),
            )
            .append_scalar(
                Fq::from_hex("c356dbb39478508818e0320dffa6c1ef512564366ec885ee2fc4d385dd36df0f")
                    .expect("failed to create scalar"),
            );

        assert_eq!(
            roi.to_bytes(),
            [
                0xe0, 0x5c, 0x25, 0xd2, 0xc1, 0x7e, 0xc2, 0x0d, 0x6b, 0xc8, 0xfd, 0x21, 0x20, 0x4a,
                0xf5, 0x28, 0x08, 0x45, 0x10, 0x76, 0xcf, 0xf6, 0x87, 0x40, 0x71, 0x64, 0xa2, 0x1d,
                0x35, 0x2d, 0xdd, 0xa2, 0x61, 0xab, 0xed, 0x59, 0x4a, 0x3c, 0x28, 0x44, 0x0c, 0x70,
                0x99, 0x86, 0x7f, 0xd3, 0xe0, 0xf7, 0xa8, 0x12, 0x32, 0x1b, 0x37, 0xe4, 0x42, 0xf7,
                0x17, 0xe2, 0xe9, 0xc2, 0x6e, 0x9b, 0xef, 0x07
            ]
        );

        assert_eq!(
            roi.to_fields(),
            [
                Fp::from_hex("e05c25d2c17ec20d6bc8fd21204af52808451076cff687407164a21d352ddd22")
                    .expect("failed to create field"),
                Fp::from_hex("86adb66729f1a01031c0651afe4d83dfa34ac86cdc900bdd5f88a70bbb6dbe1f")
                    .expect("failed to create field"),
                Fp::from_hex("0000000000000000000000000000000000000000000000000000000000000000")
                    .expect("failed to create field"),
            ]
        );
    }

    #[test]
    fn to_fields_2_bits_scalar_u32() {
        let roi = ROInput::new()
            .append_bool(true)
            .append_bool(false)
            .append_scalar(
                Fq::from_hex("689634de233b06251a80ac7df64483922727757eea1adc6f0c8f184441cfe10d")
                    .expect("failed to create scalar"),
            )
            .append_u32(834803);

        assert_eq!(
            roi.to_bytes(),
            [
                0xa1, 0x59, 0xd2, 0x78, 0x8f, 0xec, 0x18, 0x94, 0x68, 0x00, 0xb2, 0xf6, 0xd9, 0x13,
                0x0d, 0x4a, 0x9e, 0x9c, 0xd4, 0xf9, 0xa9, 0x6b, 0x70, 0xbf, 0x31, 0x3c, 0x62, 0x10,
                0x05, 0x3d, 0x87, 0x37, 0xe6, 0x79, 0x19, 0x00, 0x00
            ]
        );

        assert_eq!(
            roi.to_fields(),
            [
                Fp::from_hex("a159d2788fec18946800b2f6d9130d4a9e9cd4f9a96b70bf313c6210053d8737")
                    .expect("failed to create field"),
                Fp::from_hex("98e7650000000000000000000000000000000000000000000000000000000000")
                    .expect("failed to create field"),
            ]
        );
    }

    #[test]
    fn to_fields_2_bits_field_scalar() {
        let roi = ROInput::new()
            .append_bool(false)
            .append_bool(true)
            .append_field(
                Fp::from_hex("90926b620ad09ed616d5df158504faed42928719c58ae619d9eccc062f920411")
                    .expect("failed to create field"),
            )
            .append_scalar(
                Fq::from_hex("689634de233b06251a80ac7df64483922727757eea1adc6f0c8f184441cfe10d")
                    .expect("failed to create scalar"),
            );

        assert_eq!(
            roi.to_bytes(),
            [
                0x90, 0x92, 0x6b, 0x62, 0x0a, 0xd0, 0x9e, 0xd6, 0x16, 0xd5, 0xdf, 0x15, 0x85, 0x04,
                0xfa, 0xed, 0x42, 0x92, 0x87, 0x19, 0xc5, 0x8a, 0xe6, 0x19, 0xd9, 0xec, 0xcc, 0x06,
                0x2f, 0x92, 0x04, 0x11, 0xd1, 0x2c, 0x69, 0xbc, 0x47, 0x76, 0x0c, 0x4a, 0x34, 0x00,
                0x59, 0xfb, 0xec, 0x89, 0x06, 0x25, 0x4f, 0x4e, 0xea, 0xfc, 0xd4, 0x35, 0xb8, 0xdf,
                0x18, 0x1e, 0x31, 0x88, 0x82, 0x9e, 0xc3, 0x1b
            ]
        );

        assert_eq!(
            roi.to_fields(),
            [
                Fp::from_hex("90926b620ad09ed616d5df158504faed42928719c58ae619d9eccc062f920411")
                    .expect("failed to create field"),
                Fp::from_hex("a259d2788fec18946800b2f6d9130d4a9e9cd4f9a96b70bf313c6210053d8737")
                    .expect("failed to create field"),
                Fp::from_hex("0000000000000000000000000000000000000000000000000000000000000000")
                    .expect("failed to create field"),
            ]
        );
    }

    #[test]
    fn transaction_test_1() {
        let roi = ROInput::new()
            .append_field(
                Fp::from_hex("41203c6bbac14b357301e1f386d80f52123fd00f02197491b690bddfa742ca22")
                    .expect("failed to create field"),
            ) // fee payer
            .append_field(
                Fp::from_hex("992cdaf29ffe15b2bcea5d00e498ed4fffd117c197f0f98586e405f72ef88e00")
                    .expect("failed to create field"),
            ) // source
            .append_field(
                Fp::from_hex("3fba4fa71bce0dfdf709d827463036d6291458dfef772ff65e87bd6d1b1e062a")
                    .expect("failed to create field"),
            ) // receiver
            .append_u64(1000000) // fee
            .append_u64(1) // fee token
            .append_bool(true) // fee payer pk odd
            .append_u32(0) // nonce
            .append_u32(u32::MAX) // valid_until
            .append_bytes(&[0; 34]) // memo
            .append_bool(false) // tags[0]
            .append_bool(false) // tags[1]
            .append_bool(false) // tags[2]
            .append_bool(true) // sender pk odd
            .append_bool(false) // receiver pk odd
            .append_u64(1) // token_id
            .append_u64(10000000000) // amount
            .append_bool(false); // token_locked
        assert_eq!(roi.bits.len() + roi.fields.len() * 255, 1364);
        assert_eq!(
            roi.to_bytes(),
            [
                0x41, 0x20, 0x3c, 0x6b, 0xba, 0xc1, 0x4b, 0x35, 0x73, 0x01, 0xe1, 0xf3, 0x86, 0xd8,
                0x0f, 0x52, 0x12, 0x3f, 0xd0, 0x0f, 0x02, 0x19, 0x74, 0x91, 0xb6, 0x90, 0xbd, 0xdf,
                0xa7, 0x42, 0xca, 0xa2, 0x4c, 0x16, 0x6d, 0xf9, 0x4f, 0xff, 0x0a, 0x59, 0x5e, 0xf5,
                0x2e, 0x00, 0x72, 0xcc, 0xf6, 0xa7, 0xff, 0xe8, 0x8b, 0xe0, 0x4b, 0xf8, 0xfc, 0x42,
                0x43, 0xf2, 0x82, 0x7b, 0x17, 0x7c, 0x47, 0xc0, 0x8f, 0xee, 0xd3, 0xe9, 0x86, 0x73,
                0x43, 0xff, 0x7d, 0x02, 0xf6, 0x89, 0x11, 0x8c, 0x8d, 0x75, 0x0a, 0x05, 0xd6, 0xf7,
                0xfb, 0xdd, 0x8b, 0xbd, 0xd7, 0x61, 0x6f, 0xdb, 0x86, 0x87, 0x81, 0x0a, 0x48, 0xe8,
                0x01, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20,
                0x00, 0x00, 0x00, 0xc0, 0xff, 0xff, 0xff, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                0x0a, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x5f, 0xa0, 0x12, 0x00,
                0x00, 0x00, 0x00
            ]
        );

        assert_eq!(
            roi.to_fields(),
            [
                Fp::from_hex("41203c6bbac14b357301e1f386d80f52123fd00f02197491b690bddfa742ca22")
                    .expect("failed to create field"),
                Fp::from_hex("992cdaf29ffe15b2bcea5d00e498ed4fffd117c197f0f98586e405f72ef88e00")
                    .expect("failed to create field"),
                Fp::from_hex("3fba4fa71bce0dfdf709d827463036d6291458dfef772ff65e87bd6d1b1e062a")
                    .expect("failed to create field"),
                Fp::from_hex("40420f0000000000010000000000000001000000feffffff0100000000000000")
                    .expect("failed to create field"),
                Fp::from_hex("0000000000000000000000000000000000000000000000000000400100000000")
                    .expect("failed to create field"),
                Fp::from_hex("00000000902f5009000000000000000000000000000000000000000000000000")
                    .expect("failed to create field"),
            ]
        );
    }

    #[test]
    fn nested_roinput_test() {
        #[derive(Clone, Debug)]
        struct A {
            x: u32,
            y: bool,
            z: u32,
        }

        impl Hashable for A {
            type D = ();

            fn to_roinput(&self) -> ROInput {
                ROInput::new()
                    .append_u32(self.x)
                    .append_bool(self.y)
                    .append_u32(self.z)
            }

            fn domain_string(_: Self::D) -> Option<String> {
                "A".to_string().into()
            }
        }

        #[derive(Clone, Debug)]
        struct B1 {
            a: A,
            b: u64,
            c: bool,
        }

        impl Hashable for B1 {
            type D = ();

            fn to_roinput(&self) -> ROInput {
                self.a.to_roinput().append_u64(self.b).append_bool(self.c)
            }

            fn domain_string(_: Self::D) -> Option<String> {
                "B".to_string().into()
            }
        }

        #[derive(Clone, Debug)]
        struct B2 {
            a: A,
            b: u64,
            c: bool,
        }

        impl Hashable for B2 {
            type D = ();

            fn to_roinput(&self) -> ROInput {
                self.a
                    .to_roinput()
                    .append_roinput(ROInput::new().append_u64(self.b).append_bool(self.c))
            }

            fn domain_string(_: Self::D) -> Option<String> {
                "B".to_string().into()
            }
        }

        let a = A {
            x: 16830533,
            y: false,
            z: 39827791,
        };
        let b1 = B1 {
            a,
            b: 124819,
            c: true,
        };
        let b2 = B2 {
            a: b1.a.clone(),
            b: b1.b,
            c: b1.c,
        };

        assert_eq!(b1.to_roinput(), b2.to_roinput());

        let b2 = B2 {
            a: b1.a.clone(),
            b: b1.b,
            c: false,
        };
        assert_ne!(b1.to_roinput(), b2.to_roinput());

        let b2 = B2 {
            a: b1.a.clone(),
            b: b1.b + 1,
            c: b1.c,
        };
        assert_ne!(b1.to_roinput(), b2.to_roinput());
    }
}