// Minimal iOS app entry point — pure sx, no .m files.
//
// 1. Register a class `SxAppDelegate : UIResponder <UIApplicationDelegate>`
//    dynamically, with one method:
//       application:didFinishLaunchingWithOptions: returns YES (BOOL 1).
// 2. Call UIApplicationMain(0, null, null, @"SxAppDelegate") to hand off to
//    UIKit's run loop. This blocks until the app exits.
//
// After install + launch, the simulator shows the default black screen
// (UIWindow not created — that's 5.8) and the AppDelegate callback fires
// once at startup. The process stays alive because UIApplicationMain
// drives the iOS run loop.

#import "modules/std.sx";
#import "modules/ffi/objc.sx";

#framework "UIKit";

UIApplicationMain :: (argc: i32, argv: *void, principal_class: *NSString, delegate_class: *NSString) -> i32 #foreign;

// IMP for application:didFinishLaunchingWithOptions:
//   Obj-C: -(BOOL)application:(UIApplication *)app didFinishLaunchingWithOptions:(NSDictionary *)opts
//   Type encoding: "c@:@@"  -- BOOL (signed char), self, _cmd, id, id
did_finish_launching :: (self: *void, _cmd: *void, app: *void, opts: *void) -> u8 callconv(.c) {
    NSLog(xx "[sx] application:didFinishLaunchingWithOptions: called\n");
    return 1; // YES
}

main :: () -> i32 {
    // SxAppDelegate : UIResponder. We deliberately don't try
    // `class_addProtocol(UIApplicationDelegate)` — the linker dead-strips the
    // protocol metadata from UIKit when nothing references it at compile
    // time, and the C runtime can't look it up by name. UIApplicationMain
    // duck-types on the method name, so this works without formal conformance.
    UIResponder := objc_getClass("UIResponder".ptr);
    SxAppDelegate := objc_allocateClassPair(UIResponder, "SxAppDelegate".ptr, 0);

    sel := sel_registerName("application:didFinishLaunchingWithOptions:".ptr);
    class_addMethod(SxAppDelegate, sel, xx did_finish_launching, "c@:@@".ptr);

    objc_registerClassPair(SxAppDelegate);

    // Hand off to the iOS run loop. Never returns under normal operation.
    return UIApplicationMain(0, xx 0, xx 0, xx "SxAppDelegate");
}