#![no_std]
#![no_main]

use lancer_user::fs;
use lancer_user::net;
use lancer_user::println;
use lancer_user::syscall;

const INODE_TYPE_DIR: u8 = 1;

#[unsafe(no_mangle)]
pub extern "C" fn lancer_main() -> ! {
    let (rx, _tx) = match net::init() {
        Some(pair) => pair,
        None => syscall::exit(),
    };

    let mut args_buf = [0u8; 256];
    let args_len = net::recv_args(&rx, &mut args_buf);
    let args = &args_buf[..args_len];

    let (_cmd, rest) = net::next_token(args);
    let (path_tok, _) = net::next_token(rest);

    if path_tok.is_empty() {
        syscall::exit();
    }

    let mut client = unsafe { fs::init() };

    match fs::open_path(&mut client, 0, path_tok) {
        Ok(handle) => match client.stat(handle) {
            Ok(st) if st.inode_type == INODE_TYPE_DIR => {
                let _ = client.close(handle);
            }
            Ok(_) => {
                let _ = client.close(handle);
                println!("cd: not a directory");
            }
            Err(e) => {
                let _ = client.close(handle);
                println!("cd: {}", e.name());
            }
        },
        Err(e) => {
            println!("cd: {}", e.name());
        }
    }

    syscall::exit()
}