#[repr(C)]
pub struct PowerSocket {
    power_rate: f32,
    on: bool,
}

#[unsafe(no_mangle)]
pub extern "C" fn power_socket_new(power_rate: f32, on: bool) -> PowerSocket {
    PowerSocket { power_rate, on }
}

#[unsafe(no_mangle)]
pub extern "C" fn power_socket_is_on(power_socket: &PowerSocket) -> bool {
    power_socket.on
}

#[unsafe(no_mangle)]
pub extern "C" fn power_socket_set_on(power_socket: &mut PowerSocket, on: bool) {
    power_socket.on = on
}

#[unsafe(no_mangle)]
pub extern "C" fn power_socket_get_power(power_socket: &PowerSocket) -> f32 {
    if power_socket.on { power_socket.power_rate } else { 0.0 }
}

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

    #[test]
    fn it_works() {
        let mut power_socket = power_socket_new(12.0, false);
        assert_eq!(power_socket.power_rate, 12.0);
        assert_eq!(power_socket.on, false);

        assert_eq!(power_socket_is_on(&power_socket), false);
        assert_eq!(power_socket_get_power(&power_socket), 0.0);

        power_socket_set_on(&mut power_socket, true);

        assert_eq!(power_socket_is_on(&power_socket), true);
        assert_eq!(power_socket_get_power(&power_socket), 12.0);
    }
}