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// Copyright (C) 2019-2021 Aleo Systems Inc.
// This file is part of the snarkVM library.

// The snarkVM library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The snarkVM library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the snarkVM library. If not, see <https://www.gnu.org/licenses/>.

use snarkvm_fields::{FftParameters, FieldParameters, Fp256, Fp256Parameters};
use snarkvm_utilities::biginteger::BigInteger256 as BigInteger;

/// This field is the scalar field (Fr) of BLS12-377.
pub type Fr = Fp256<FrParameters>;

pub struct FrParameters;

impl Fp256Parameters for FrParameters {}

impl FftParameters for FrParameters {
    type BigInteger = BigInteger;

    #[rustfmt::skip]
    const TWO_ADICITY: u32 = 47;
    #[rustfmt::skip]
    const TWO_ADIC_ROOT_OF_UNITY: BigInteger = BigInteger([
        0x3c3d3ca739381fb2,
        0x9a14cda3ec99772b,
        0xd7aacc7c59724826,
        0xd1ba211c5cc349c,
    ]);
}

impl FieldParameters for FrParameters {
    #[rustfmt::skip]
    const CAPACITY: u32 = Self::MODULUS_BITS - 1;
    /// GENERATOR = 11
    #[rustfmt::skip]
    const GENERATOR: BigInteger = BigInteger([
        1855201571499933546u64,
        8511318076631809892u64,
        6222514765367795509u64,
        1122129207579058019u64,
    ]);
    #[rustfmt::skip]
    const INV: u64 = 725501752471715839u64;
    /// MODULUS = 8444461749428370424248824938781546531375899335154063827935233455917409239041
    #[rustfmt::skip]
    const MODULUS: BigInteger = BigInteger([
        725501752471715841u64,
        6461107452199829505u64,
        6968279316240510977u64,
        1345280370688173398u64,
    ]);
    #[rustfmt::skip]
    const MODULUS_BITS: u32 = 253;
    /// (r - 1)/2 =
    /// 4222230874714185212124412469390773265687949667577031913967616727958704619520
    #[rustfmt::skip]
    const MODULUS_MINUS_ONE_DIV_TWO: BigInteger = BigInteger([
        0x8508c00000000000,
        0xacd53b7f68000000,
        0x305a268f2e1bd800,
        0x955b2af4d1652ab,
    ]);
    #[rustfmt::skip]
    const R: BigInteger = BigInteger([
        9015221291577245683u64,
        8239323489949974514u64,
        1646089257421115374u64,
        958099254763297437u64,
    ]);
    #[rustfmt::skip]
    const R2: BigInteger = BigInteger([
        2726216793283724667u64,
        14712177743343147295u64,
        12091039717619697043u64,
        81024008013859129u64,
    ]);
    #[rustfmt::skip]
    const REPR_SHAVE_BITS: u32 = 3;
    // T and T_MINUS_ONE_DIV_TWO, where r - 1 = 2^s * t

    /// t = (r - 1) / 2^s =
    /// 60001509534603559531609739528203892656505753216962260608619555
    #[rustfmt::skip]
    const T: BigInteger = BigInteger([
        0xedfda00000021423,
        0x9a3cb86f6002b354,
        0xcabd34594aacc168,
        0x2556,
    ]);
    /// (t - 1) / 2 =
    /// 30000754767301779765804869764101946328252876608481130304309777
    #[rustfmt::skip]
    const T_MINUS_ONE_DIV_TWO: BigInteger = BigInteger([
        0x76fed00000010a11,
        0x4d1e5c37b00159aa,
        0x655e9a2ca55660b4,
        0x12ab,
    ]);
}