#![deny(unsafe_op_in_unsafe_fn)]
use objc2::rc::Retained;
use objc2::runtime::ProtocolObject;
use objc2::{declare_class, msg_send_id, mutability, ClassType, DeclaredClass};
use objc2_app_kit::{NSApplication, NSApplicationActivationPolicy, NSApplicationDelegate};
use objc2_foundation::{
    ns_string, MainThreadMarker, NSCopying, NSNotification, NSObject, NSObjectProtocol, NSString,
};

#[derive(Debug)]
#[allow(unused)]
struct Ivars {
    ivar: u8,
    another_ivar: bool,
    box_ivar: Box<i32>,
    maybe_box_ivar: Option<Box<i32>>,
    id_ivar: Retained<NSString>,
    maybe_id_ivar: Option<Retained<NSString>>,
}

declare_class!(
    struct AppDelegate;

    // SAFETY:
    // - The superclass NSObject does not have any subclassing requirements.
    // - Main thread only mutability is correct, since this is an application delegate.
    // - `AppDelegate` does not implement `Drop`.
    unsafe impl ClassType for AppDelegate {
        type Super = NSObject;
        type Mutability = mutability::MainThreadOnly;
        const NAME: &'static str = "MyAppDelegate";
    }

    impl DeclaredClass for AppDelegate {
        type Ivars = Ivars;
    }

    unsafe impl NSObjectProtocol for AppDelegate {}

    unsafe impl NSApplicationDelegate for AppDelegate {
        #[method(applicationDidFinishLaunching:)]
        fn did_finish_launching(&self, notification: &NSNotification) {
            println!("Did finish launching!");
            // Do something with the notification
            dbg!(notification);
        }

        #[method(applicationWillTerminate:)]
        fn will_terminate(&self, _notification: &NSNotification) {
            println!("Will terminate!");
        }
    }
);

impl AppDelegate {
    fn new(ivar: u8, another_ivar: bool, mtm: MainThreadMarker) -> Retained<Self> {
        let this = mtm.alloc();
        let this = this.set_ivars(Ivars {
            ivar,
            another_ivar,
            box_ivar: Box::new(2),
            maybe_box_ivar: None,
            id_ivar: NSString::from_str("abc"),
            maybe_id_ivar: Some(ns_string!("def").copy()),
        });
        unsafe { msg_send_id![super(this), init] }
    }
}

fn main() {
    let mtm: MainThreadMarker = MainThreadMarker::new().unwrap();

    let app = NSApplication::sharedApplication(mtm);
    app.setActivationPolicy(NSApplicationActivationPolicy::Regular);

    // configure the application delegate
    let delegate = AppDelegate::new(42, true, mtm);
    let object = ProtocolObject::from_ref(&*delegate);
    app.setDelegate(Some(object));

    // run the app
    unsafe { app.run() };
}