#![allow(unused_macros)]

// use ffi;
use std::cell::Cell;
// use std::ptr;
use std::sync::atomic::{AtomicBool, Ordering, ATOMIC_BOOL_INIT};

thread_local! {
    static IS_MAIN_THREAD: Cell<bool> = Cell::new(false)
}

static INITIALIZED: AtomicBool = ATOMIC_BOOL_INIT;

/// Asserts that this is the main thread and either `gdk::init` or `gtk::init` has been called.
macro_rules! assert_initialized_main_thread {
    () => {
        if !crate::rt::is_initialized_main_thread() {
            if crate::rt::is_initialized() {
                panic!("GDK may only be used from the main thread.");
            } else {
                panic!("GDK has not been initialized. Call `gdk::init` or `gtk::init` first.");
            }
        }
    };
}

/// No-op.
macro_rules! skip_assert_initialized {
    () => {};
}

/// Asserts that neither `gdk::init` nor `gtk::init` has been called.
macro_rules! assert_not_initialized {
    () => {
        if ::rt::is_initialized() {
            panic!("This function has to be called before `gdk::init` or `gtk::init`.");
        }
    };
}

/// Returns `true` if GDK has been initialized.
#[inline]
pub fn is_initialized() -> bool {
    skip_assert_initialized!();
    INITIALIZED.load(Ordering::Acquire)
}

/// Returns `true` if GDK has been initialized and this is the main thread.
#[inline]
pub fn is_initialized_main_thread() -> bool {
    skip_assert_initialized!();
    IS_MAIN_THREAD.with(|c| c.get())
}

// /// Informs this crate that GDK has been initialized and the current thread is the main one.
// pub unsafe fn set_initialized() {
//     skip_assert_initialized!();
//     if is_initialized_main_thread() {
//         return;
//     } else if is_initialized() {
//         panic!("Attempted to initialize GDK from two different threads.");
//     }
//     INITIALIZED.store(true, Ordering::Release);
//     IS_MAIN_THREAD.with(|c| c.set(true));
// }

//pub fn init() {
//    assert_not_initialized!();
//    unsafe {
//        gdk_sys::gdk_init(ptr::null_mut(), ptr::null_mut());
//        set_initialized();
//    }
//}
