#![allow(non_snake_case)]

/// Global debug verbosity level (C `g_debuglevel` from debug.c).
/// Only meaningful when debug logging is enabled at compile time.
#[no_mangle]
pub static mut g_debuglevel: i32 = 0;

/// Compile-time debug level for this Rust build (matches C `DEBUGLEVEL` default 0).
pub const DEBUGLEVEL: i32 = 0;

#[inline]
pub fn debug_enabled(level: i32) -> bool {
    DEBUGLEVEL >= 2 && level <= unsafe { g_debuglevel }
}

/// No-op when DEBUGLEVEL < 2; otherwise would log to stderr.
#[macro_export]
macro_rules! RAWLOG {
    ($level:expr, $($arg:tt)*) => {{
        if $crate::debug::debug_enabled($level) {
            eprint!($($arg)*);
        }
    }};
}

/// No-op when DEBUGLEVEL < 2; otherwise would log file:line prefix + message.
#[macro_export]
macro_rules! DEBUGLOG {
    ($level:expr, $($arg:tt)*) => {{
        if $crate::debug::debug_enabled($level) {
            eprint!("{}:{}: ", file!(), line!());
            eprintln!($($arg)*);
        }
    }};
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn default_build_has_logging_disabled() {
        assert_eq!(DEBUGLEVEL, 0);
        assert!(!debug_enabled(i32::MIN));
    }

    #[test]
    fn logging_macros_accept_format_arguments() {
        RAWLOG!(2, "{}", 1);
        DEBUGLOG!(2, "{}", 1);
    }
}