use core::fmt;

struct Writer;

impl fmt::Write for Writer {
    fn write_str(&mut self, s: &str) -> fmt::Result {
        // The log server first; a process without either prints nothing.
        // A call, not a send: the text is out before the caller goes on.
        if let Some(log) = crate::start::log() {
            for chunk in s.as_bytes().chunks(types::log::TEXT_BYTES) {
                let _ = crate::syscall::call(log, types::log::text_words(chunk), None);
            }
        } else if let Some(console) = crate::start::console() {
            for &b in s.as_bytes() {
                crate::syscall::debug_putchar(console, b);
            }
        }
        Ok(())
    }
}

pub fn _print(args: fmt::Arguments) {
    use fmt::Write;
    Writer.write_fmt(args).ok();
}

#[macro_export]
macro_rules! print {
    ($($arg:tt)*) => ($crate::io::_print(format_args!($($arg)*)));
}

#[macro_export]
macro_rules! println {
    () => ($crate::print!("\n"));
    ($($arg:tt)*) => ($crate::print!("{}\n", format_args!($($arg)*)));
}