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use std::num::NonZeroU32;

/// Useful extensions.
pub(crate) trait NonZeroU32Ext: Sized + Copy {
    /// Add.
    #[inline(always)]
    fn checked_add(self, increment: Self) -> Option<Self> {
        self.to_u32()
            .checked_add(increment.to_u32())
            .map(Self::non_zero_unchecked)
    }

    /// Add.
    #[inline(always)]
    fn add_assign(&mut self, increment: Self) {
        *self = Self::non_zero_unchecked(self.to_u32() + increment.to_u32())
    }

    /// Next power of two.
    #[inline(always)]
    fn next_power_of_two(self) -> Self {
        Self::non_zero_unchecked(self.to_u32().next_power_of_two())
    }

    /// Non zero.
    #[inline(always)]
    fn non_zero(value: u32) -> Self {
        debug_assert_ne!(value, 0, "value is zero");

        Self::non_zero_unchecked(value)
    }

    /// Non zero.
    fn non_zero_unchecked(value: u32) -> Self;

    #[doc(hidden)]
    fn to_u32(self) -> u32;
}

impl NonZeroU32Ext for NonZeroU32 {
    #[inline(always)]
    fn to_u32(self) -> u32 {
        self.get()
    }

    #[inline(always)]
    fn non_zero_unchecked(value: u32) -> Self {
        unsafe { NonZeroU32::new_unchecked(value) }
    }
}