use walkdir::DirEntry;

fn get_block_size() -> u64 {
    // All os specific implementations of MetatdataExt seem to define a block as 512 bytes
    // https://doc.rust-lang.org/std/os/linux/fs/trait.MetadataExt.html#tymethod.st_blocks
    512
}

#[cfg(target_family = "unix")]
pub fn get_metadata(d: &DirEntry, use_apparent_size: bool) -> Option<(u64, Option<(u64, u64)>)> {
    use std::os::unix::fs::MetadataExt;
    d.metadata().ok().and_then(|md| {
        let inode = Some((md.ino(), md.dev()));
        if use_apparent_size {
            Some((md.len(), inode))
        } else {
            Some((md.blocks() * get_block_size(), inode))
        }
    })
}

#[cfg(not(target_family = "unix"))]
pub fn get_metadata(d: &DirEntry, _apparent: bool) -> Option<(u64, Option<(u64, u64)>)> {
    d.metadata().ok().map_or(None, |md| Some((md.len(), None)))
}