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// Copyright (C) 2019-2023 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::*;
use console::program::Register;

pub trait Load<N: Network> {
    /// Loads the value of a given operand.
    ///
    /// # Errors
    /// This method should halt if the register locator is not found.
    /// In the case of register members, this method should halt if the member is not found.
    fn load(&self, stack: &Stack<N>, operand: &Operand<N>) -> Result<Value<N>>;

    /// Loads the literal of a given operand.
    ///
    /// # Errors
    /// This method should halt if the given operand is not a literal.
    /// This method should halt if the register locator is not found.
    /// In the case of register members, this method should halt if the member is not found.
    #[inline]
    fn load_literal(&self, stack: &Stack<N>, operand: &Operand<N>) -> Result<Literal<N>> {
        match self.load(stack, operand)? {
            Value::Plaintext(Plaintext::Literal(literal, ..)) => Ok(literal),
            Value::Plaintext(Plaintext::Struct(..)) => bail!("Operand must be a literal"),
            Value::Record(..) => bail!("Operand must be a literal"),
        }
    }

    /// Loads the plaintext of a given operand.
    ///
    /// # Errors
    /// This method should halt if the given operand is not a plaintext.
    /// This method should halt if the register locator is not found.
    /// In the case of register members, this method should halt if the member is not found.
    #[inline]
    fn load_plaintext(&self, stack: &Stack<N>, operand: &Operand<N>) -> Result<Plaintext<N>> {
        match self.load(stack, operand)? {
            Value::Plaintext(plaintext) => Ok(plaintext),
            Value::Record(..) => bail!("Operand must be a plaintext"),
        }
    }
}

pub trait LoadCircuit<N: Network, A: circuit::Aleo<Network = N>> {
    /// Loads the value of a given operand.
    ///
    /// # Errors
    /// This method should halt if the register locator is not found.
    /// In the case of register members, this method should halt if the member is not found.
    fn load_circuit(&self, stack: &Stack<N>, operand: &Operand<N>) -> Result<circuit::Value<A>>;

    /// Loads the literal of a given operand.
    ///
    /// # Errors
    /// This method should halt if the given operand is not a literal.
    /// This method should halt if the register locator is not found.
    /// In the case of register members, this method should halt if the member is not found.
    #[inline]
    fn load_literal_circuit(&self, stack: &Stack<N>, operand: &Operand<N>) -> Result<circuit::Literal<A>> {
        match self.load_circuit(stack, operand)? {
            circuit::Value::Plaintext(circuit::Plaintext::Literal(literal, ..)) => Ok(literal),
            circuit::Value::Plaintext(circuit::Plaintext::Struct(..)) => bail!("Operand must be a literal"),
            circuit::Value::Record(..) => bail!("Operand must be a literal"),
        }
    }

    /// Loads the plaintext of a given operand.
    ///
    /// # Errors
    /// This method should halt if the given operand is not a plaintext.
    /// This method should halt if the register locator is not found.
    /// In the case of register members, this method should halt if the member is not found.
    #[inline]
    fn load_plaintext_circuit(&self, stack: &Stack<N>, operand: &Operand<N>) -> Result<circuit::Plaintext<A>> {
        match self.load_circuit(stack, operand)? {
            circuit::Value::Plaintext(plaintext) => Ok(plaintext),
            circuit::Value::Record(..) => bail!("Operand must be a plaintext"),
        }
    }
}

pub trait Store<N: Network> {
    /// Assigns the given value to the given register, assuming the register is not already assigned.
    ///
    /// # Errors
    /// This method should halt if the given register is a register member.
    /// This method should halt if the given register is an input register.
    /// This method should halt if the register is already used.
    fn store(&mut self, stack: &Stack<N>, register: &Register<N>, stack_value: Value<N>) -> Result<()>;

    /// Assigns the given literal to the given register, assuming the register is not already assigned.
    ///
    /// # Errors
    /// This method should halt if the given register is a register member.
    /// This method should halt if the given register is an input register.
    /// This method should halt if the register is already used.
    #[inline]
    fn store_literal(&mut self, stack: &Stack<N>, register: &Register<N>, literal: Literal<N>) -> Result<()> {
        self.store(stack, register, Value::Plaintext(Plaintext::from(literal)))
    }
}

pub trait StoreCircuit<N: Network, A: circuit::Aleo<Network = N>> {
    /// Assigns the given value to the given register, assuming the register is not already assigned.
    ///
    /// # Errors
    /// This method should halt if the given register is a register member.
    /// This method should halt if the given register is an input register.
    /// This method should halt if the register is already used.
    fn store_circuit(&mut self, stack: &Stack<N>, register: &Register<N>, stack_value: circuit::Value<A>)
    -> Result<()>;

    /// Assigns the given literal to the given register, assuming the register is not already assigned.
    ///
    /// # Errors
    /// This method should halt if the given register is a register member.
    /// This method should halt if the given register is an input register.
    /// This method should halt if the register is already used.
    #[inline]
    fn store_literal_circuit(
        &mut self,
        stack: &Stack<N>,
        register: &Register<N>,
        literal: circuit::Literal<A>,
    ) -> Result<()> {
        self.store_circuit(stack, register, circuit::Value::Plaintext(circuit::Plaintext::from(literal)))
    }
}