//! Bitwise OR via the [`BitOr`] trait.
use super::U384;
use core::ops::BitOr;

/// Computes the bitwise OR of two 384-bit integers, producing a
/// result where each bit is set if either corresponding input bit
/// is set.
///
/// Applied independently to each of the six `u64` limbs.
///
/// # Examples
///
/// ```
/// use cnfy_uint::u384::U384;
///
/// let a = U384::from_be_limbs([0xF0, 0, 0, 0, 0, 0]);
/// let b = U384::from_be_limbs([0x0F, 0, 0, 0, 0, 0]);
/// assert_eq!(a | b, U384::from_be_limbs([0xFF, 0, 0, 0, 0, 0]));
/// ```
impl BitOr for U384 {
    type Output = U384;

    #[inline]
    fn bitor(self, rhs: U384) -> U384 {
        U384([
            self.0[0] | rhs.0[0],
            self.0[1] | rhs.0[1],
            self.0[2] | rhs.0[2],
            self.0[3] | rhs.0[3],
            self.0[4] | rhs.0[4],
            self.0[5] | rhs.0[5],
        ])
    }
}

#[cfg(test)]
mod ai_tests {
    use super::*;

    /// OR with self is identity.
    #[test]
    fn self_identity() {
        let a = U384::from_be_limbs([0x1234, 0x5678, 0x9ABC, 0xDEF0, 0x1111, 0x2222]);
        assert_eq!(a | a, a);
    }

    /// OR with zero is identity.
    #[test]
    fn or_zero() {
        let a = U384::from_be_limbs([0x1234, 0x5678, 0x9ABC, 0xDEF0, 0x1111, 0x2222]);
        assert_eq!(a | U384::ZERO, a);
    }

    /// OR with MAX is MAX.
    #[test]
    fn or_max() {
        let a = U384::from_be_limbs([0x1234, 0x5678, 0x9ABC, 0xDEF0, 0x1111, 0x2222]);
        assert_eq!(a | U384::MAX, U384::MAX);
    }

    /// OR is commutative.
    #[test]
    fn commutative() {
        let a = U384::from_be_limbs([1, 2, 3, 4, 5, 6]);
        let b = U384::from_be_limbs([7, 8, 9, 10, 11, 12]);
        assert_eq!(a | b, b | a);
    }

    /// Combining disjoint bits.
    #[test]
    fn disjoint_bits() {
        let a = U384::from_be_limbs([0, 0, 0, 0, 0, 0xF0]);
        let b = U384::from_be_limbs([0, 0, 0, 0, 0, 0x0F]);
        assert_eq!(a | b, U384::from_be_limbs([0, 0, 0, 0, 0, 0xFF]));
    }
}
