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use crate::backends::core::implementation::engines::CoreEngine;
use crate::backends::core::implementation::entities::{Cleartext32, Cleartext64};
use crate::specification::engines::{
    CleartextDiscardingRetrievalEngine, CleartextDiscardingRetrievalError,
};

/// # Description:
/// Implementation of [`CleartextDiscardingRetrievalEngine`] for [`CoreEngine`] that operates on 32
/// bits integers.
impl CleartextDiscardingRetrievalEngine<Cleartext32, u32> for CoreEngine {
    /// # Example:
    /// ```
    /// use concrete_core::prelude::*;
    /// # use std::error::Error;
    ///
    /// # fn main() -> Result<(), Box<dyn Error>> {
    /// let input: u32 = 3;
    /// let mut output: u32 = 0;
    ///
    /// let mut engine = CoreEngine::new()?;
    /// let cleartext: Cleartext32 = engine.create_cleartext(&input)?;
    /// engine.discard_retrieve_cleartext(&mut output, &cleartext)?;
    ///
    /// assert_eq!(output, 3_u32);
    /// engine.destroy(cleartext)?;
    /// #
    /// # Ok(())
    /// # }
    /// ```
    fn discard_retrieve_cleartext(
        &mut self,
        output: &mut u32,
        input: &Cleartext32,
    ) -> Result<(), CleartextDiscardingRetrievalError<Self::EngineError>> {
        unsafe { self.discard_retrieve_cleartext_unchecked(output, input) };
        Ok(())
    }

    unsafe fn discard_retrieve_cleartext_unchecked(
        &mut self,
        output: &mut u32,
        input: &Cleartext32,
    ) {
        *output = input.0 .0;
    }
}

/// # Description:
/// Implementation of [`CleartextDiscardingRetrievalEngine`] for [`CoreEngine`] that operates on 32
/// bits integers.
impl CleartextDiscardingRetrievalEngine<Cleartext64, u64> for CoreEngine {
    /// # Example:
    /// ```
    /// use concrete_core::prelude::*;
    /// # use std::error::Error;
    ///
    /// # fn main() -> Result<(), Box<dyn Error>> {
    /// let input: u64 = 3;
    /// let mut output: u64 = 0;
    ///
    /// let mut engine = CoreEngine::new()?;
    /// let cleartext: Cleartext64 = engine.create_cleartext(&input)?;
    /// engine.discard_retrieve_cleartext(&mut output, &cleartext)?;
    ///
    /// assert_eq!(output, 3_u64);
    /// engine.destroy(cleartext)?;
    /// #
    /// # Ok(())
    /// # }
    /// ```
    fn discard_retrieve_cleartext(
        &mut self,
        output: &mut u64,
        input: &Cleartext64,
    ) -> Result<(), CleartextDiscardingRetrievalError<Self::EngineError>> {
        unsafe { self.discard_retrieve_cleartext_unchecked(output, input) };
        Ok(())
    }

    unsafe fn discard_retrieve_cleartext_unchecked(
        &mut self,
        output: &mut u64,
        input: &Cleartext64,
    ) {
        *output = input.0 .0;
    }
}