#[path = "../../../os-vfs-lookup/src/lib.rs"]
mod os_vfs_lookup;
#[path = "../../../os-vfs-open/src/lib.rs"]
mod os_vfs_open;
#[path = "../../../os-vfs-offset/src/lib.rs"]
mod offset;

fn handles() -> (os_vfs_open::Handle, os_vfs_open::Handle) {
    let first = os_vfs_lookup::Mount::new(1, 11, b"dosya").unwrap();
    let second = os_vfs_lookup::Mount::new(2, 22, b"dosya").unwrap();
    let lookup = os_vfs_lookup::LookupTable::new(first, second).unwrap();
    let dentry = lookup.lookup(1, b"dosya").unwrap();
    let mut opens = os_vfs_open::OpenTable::new();
    (opens.open(&lookup, dentry, os_vfs_open::OpenFlags::READ_ONLY).unwrap(),
     opens.open(&lookup, dentry, os_vfs_open::OpenFlags::READ_ONLY).unwrap())
}

#[test]
fn os_vfs_paths_offset_positive() {
    let (first, second) = handles();
    let mut table = offset::CursorTable::new();
    table.attach(first).unwrap();
    table.attach(second).unwrap();
    assert_eq!(table.read_complete(first.id, 8, 3), Ok(3));
    assert_eq!(table.offset(first.id), Ok(3));
    assert_eq!(table.offset(second.id), Ok(0));
    assert_eq!(table.seek(first.id, offset::Whence::Current, 4, 10), Ok(7));
    assert_eq!(table.seek(first.id, offset::Whence::End, -2, 10), Ok(8));
    assert_eq!(table.offset(first.id), Ok(8));
    assert_eq!(table.offset(second.id), Ok(0));
}

#[test]
fn os_vfs_paths_offset_negative() {
    let (first, second) = handles();
    let mut table = offset::CursorTable::new();
    table.attach(first).unwrap();
    table.attach(second).unwrap();
    assert_eq!(table.read_complete(first.id, 8, 3), Ok(3));
    let before = table;
    assert_eq!(table.seek(first.id, offset::Whence::Start, -1, 10),
        Err(offset::Error::NegativeSeek));
    assert_eq!(table, before);
    assert_eq!(table.seek(first.id, offset::Whence::End, 1, u64::MAX),
        Err(offset::Error::Overflow));
    assert_eq!(table, before);
    assert_eq!(table.read_complete(first.id, 3, 4),
        Err(offset::Error::InvalidCompletion));
    assert_eq!(table, before);
    assert_eq!(table.offset(second.id), Ok(0));
    assert_eq!(table.seek(second.id, offset::Whence::Start, 5, 10), Ok(5));
    assert_eq!(table.offset(first.id), Ok(3));
}