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use crate::{HeaderTagFlag, HeaderTagType};
use core::mem::size_of;

/// Terminates a list of optional tags in a Multiboot2 header.
#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
#[repr(C)]
pub struct EndHeaderTag {
    // u16 value
    typ: HeaderTagType,
    // u16 value
    flags: HeaderTagFlag,
    size: u32,
}

impl Default for EndHeaderTag {
    fn default() -> Self {
        Self::new()
    }
}

impl EndHeaderTag {
    pub const fn new() -> Self {
        EndHeaderTag {
            typ: HeaderTagType::End,
            flags: HeaderTagFlag::Required,
            size: size_of::<Self>() as u32,
        }
    }

    pub const fn typ(&self) -> HeaderTagType {
        self.typ
    }
    pub const fn flags(&self) -> HeaderTagFlag {
        self.flags
    }
    pub const fn size(&self) -> u32 {
        self.size
    }
}

#[cfg(test)]
mod tests {
    use crate::EndHeaderTag;

    #[test]
    fn test_assert_size() {
        assert_eq!(core::mem::size_of::<EndHeaderTag>(), 2 + 2 + 4);
    }
}