use std::fs;
use std::path::Path;
#[cfg(not(windows))]
use uucore::mode;

/// Takes a user-supplied string and tries to parse to u16 mode bitmask.
pub fn parse(mode_string: &str, considering_dir: bool, umask: u32) -> Result<u32, String> {
    let numbers: &[char] = &['0', '1', '2', '3', '4', '5', '6', '7', '8', '9'];

    // Passing 000 as the existing permissions seems to mirror GNU behavior.
    if mode_string.contains(numbers) {
        mode::parse_numeric(0, mode_string, considering_dir)
    } else {
        mode::parse_symbolic(0, mode_string, umask, considering_dir)
    }
}

/// chmod a file or directory on UNIX.
///
/// Adapted from mkdir.rs.  Handles own error printing.
///
#[cfg(any(unix, target_os = "redox"))]
pub fn chmod(path: &Path, mode: u32) -> Result<(), ()> {
    use std::os::unix::fs::PermissionsExt;
    use uucore::{display::Quotable, show_error};
    fs::set_permissions(path, fs::Permissions::from_mode(mode)).map_err(|err| {
        show_error!("{}: chmod failed with error {}", path.maybe_quote(), err);
    })
}

/// chmod a file or directory on Windows.
///
/// Adapted from mkdir.rs.
///
#[cfg(windows)]
pub fn chmod(path: &Path, mode: u32) -> Result<(), ()> {
    // chmod on Windows only sets the readonly flag, which isn't even honored on directories
    Ok(())
}
