//! Serialized synthetic rename with directory cycle refusal.
use super::*;
use os_turkfs_namespace::{Error, Kind, Namespace};

pub fn run(allocator: &mut memory::FrameAllocator) -> Result<(), &'static str> {
    let frames_before = allocator.remaining_pages();
    let mut ns = Namespace::<4>::new(2).map_err(|_| "k1650-namespace")?;
    let file = ns.create(1, b"old", Kind::File).map_err(|_| "k1650-file")?;
    let directory = ns.create(1, b"dir", Kind::Directory).map_err(|_| "k1650-directory")?;
    let bits = ns.allocated_bits();
    ns.rename(1, b"old", directory, b"new").map_err(|_| "k1650-rename")?;
    if file != 2 || ns.lookup(1, b"old").is_some()
        || ns.lookup(directory, b"new").map(|entry| entry.inode) != Some(file) {
        return Err("k1650-publication");
    }
    write_line("TURKOS/OS/K1650-RENAME: OLD=ABSENT NEW=INODE2");
    if ns.allocated_bits() != bits || ns.used() != 2 { return Err("k1650-bitmap"); }
    write_line("TURKOS/OS/K1650-RENAME: BITS=UNCHANGED");
    let mut tree = Namespace::<4>::new(4).map_err(|_| "k1650-tree")?;
    let parent = tree.create(1, b"parent", Kind::Directory).map_err(|_| "k1650-parent")?;
    let child = tree.create(parent, b"child", Kind::Directory).map_err(|_| "k1650-child")?;
    let leaf = tree.create(child, b"leaf", Kind::Directory).map_err(|_| "k1650-leaf")?;
    let before = tree;
    if tree.rename(1, b"parent", parent, b"self") != Err(Error::Cycle)
        || tree != before
        || tree.rename(1, b"parent", leaf, b"cycle") != Err(Error::Cycle)
        || tree != before || tree.lookup(leaf, b"cycle").is_some() {
        return Err("k1650-cycle");
    }
    write_line("TURKOS/OS/K1650-RENAME: CYCLE=UNCHANGED");
    if allocator.remaining_pages() != frames_before { return Err("k1650-frames"); }
    write_line("TURKOS/OS/K1650-RENAME: FRAMES=UNCHANGED");
    Ok(())
}