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// Copyright (C) 2019-2022 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 super::*;

impl<N: Network> ToBits for Plaintext<N> {
    /// Returns this plaintext as a list of **little-endian** bits.
    fn to_bits_le(&self) -> Vec<bool> {
        match self {
            Self::Literal(literal, bits_le) => bits_le
                .get_or_init(|| {
                    let mut bits_le = vec![false, false]; // Variant bits.
                    bits_le.extend(literal.variant().to_bits_le());
                    bits_le.extend(literal.size_in_bits().to_bits_le());
                    bits_le.extend(literal.to_bits_le());
                    bits_le
                })
                .clone(),
            Self::Struct(struct_, bits_le) => bits_le
                .get_or_init(|| {
                    let mut bits_le = vec![false, true]; // Variant bits.
                    bits_le.extend(
                        u8::try_from(struct_.len())
                            .or_halt_with::<N>("Plaintext struct length exceeds u8::MAX")
                            .to_bits_le(),
                    );
                    for (identifier, value) in struct_ {
                        let value_bits = value.to_bits_le();
                        bits_le.extend(identifier.size_in_bits().to_bits_le());
                        bits_le.extend(identifier.to_bits_le());
                        bits_le.extend(
                            u16::try_from(value_bits.len())
                                .or_halt_with::<N>("Plaintext member exceeds u16::MAX bits")
                                .to_bits_le(),
                        );
                        bits_le.extend(value_bits);
                    }
                    bits_le
                })
                .clone(),
        }
    }

    /// Returns this plaintext as a list of **big-endian** bits.
    fn to_bits_be(&self) -> Vec<bool> {
        match self {
            Self::Literal(literal, bits_be) => bits_be
                .get_or_init(|| {
                    let mut bits_be = vec![false, false]; // Variant bits.
                    bits_be.extend(literal.variant().to_bits_be());
                    bits_be.extend(literal.size_in_bits().to_bits_be());
                    bits_be.extend(literal.to_bits_be());
                    bits_be
                })
                .clone(),
            Self::Struct(struct_, bits_be) => bits_be
                .get_or_init(|| {
                    let mut bits_be = vec![false, true]; // Variant bits.
                    bits_be.extend(
                        u8::try_from(struct_.len())
                            .or_halt_with::<N>("Plaintext struct length exceeds u8::MAX")
                            .to_bits_be(),
                    );
                    for (identifier, value) in struct_ {
                        let value_bits = value.to_bits_be();
                        bits_be.extend(identifier.size_in_bits().to_bits_be());
                        bits_be.extend(identifier.to_bits_be());
                        bits_be.extend(
                            u16::try_from(value_bits.len())
                                .or_halt_with::<N>("Plaintext member exceeds u16::MAX bits")
                                .to_bits_be(),
                        );
                        bits_be.extend(value_bits);
                    }
                    bits_be
                })
                .clone(),
        }
    }
}