//! Datatypes for the program
use super::*;
use std::fs::Metadata;

mod cache; pub use cache::*;

/// A raw file or directory inode number
///
/// Ususally created from the `.inode()` extension method on `fs::Metadata` found in prelude.
/// Can also be created with `new()` from a `fs::Metadata` reference, or created unsafely from an arbitrary `u64` with `new_unchecked`.
#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Copy)]
#[repr(transparent)]
pub struct INode(u64);

impl INode
{
    /// Create a new `INode` wrapper from any `u64` without checking if it is a real inode.
    #[inline] pub const unsafe fn new_unchecked(ino: u64) -> Self
    {
	Self(ino)
    }

    /// Get `ino` from an `fs::Metadata` object.
    #[inline] pub fn new(meta: &Metadata) -> Self
    {
	use std::os::unix::fs::MetadataExt as _;
	Self(meta.ino())
    }

    /// Convert into raw `u64` inode number.
    #[inline] pub const fn into_inner(self) -> u64
    {
	self.0
    }
}

impl<'a> From<&'a Metadata> for INode
{
    #[inline] fn from(from: &'a Metadata) -> Self
    {
	from.inode()
    }
}

impl From<INode> for u64
{
    #[inline] fn from(from: INode) -> Self
    {
	from.0
    }
}

/// A valid file system info
///
/// # Note
/// This does not contains the INode of the fs object itself, that is considered that key to the table.
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum FsInfo
{
    File(u64, INode), //Size, parent dir inode
    Directory,
}

#[cfg(test)]
mod tests
{
    use super::*;
    #[tokio::test]
    async fn cache_insert_and_consume()
    {
	let mut cache = Cache::new();
	for x in 0..500
	{
	    cache.insert(unsafe { INode::new_unchecked(x) }, FsInfo::Directory).await;
	}
	let output = cache.try_complete().await.unwrap();
	assert_eq!(output.len(), 500);
	for x in 0..500
	{
	    assert_eq!(output.get(&unsafe { INode::new_unchecked(x) }).unwrap(), &FsInfo::Directory);
	}
    }
}