// ffi-objc-arc-03 — #property(weak) on sx-defined class.
//
// Weak contract:
//   - setter calls objc_storeWeak — does NOT retain.
//   - getter calls objc_loadWeakRetained + autorelease — auto-nils
//     if the target has been deallocated.
//   - -dealloc calls objc_destroyWeak on each weak ivar.
//
// Observation: assign a target to the weak property. Drop the
// caller's strong reference. Read back via the weak getter — should
// be `null` (the target deallocated when its last strong ref
// dropped, and the weak slot auto-niled).
//
// Pre-M4.B: setter just stores the pointer (no storeWeak); getter
// reads the raw pointer (no loadWeakRetained). After target's
// release, the slot points at freed memory — the read returns the
// stale pointer (not null). The test catches this by comparing the
// read result to null.

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

SxWeakTarget :: #objc_class("SxWeakTarget") {
    #extends NSObject;
    tag: i32;
    alloc :: () -> *SxWeakTarget;
}

SxWeakHolder :: #objc_class("SxWeakHolder") {
    #extends NSObject;
    target: *SxWeakTarget #property(weak);
    alloc :: () -> *SxWeakHolder;
}

main :: () -> i32 {
    inline if OS == .macos {
        gpa := GPA.init();
        tracker := TrackingAllocator.init(xx gpa);

        push Context.{ allocator = xx tracker, data = null } {
            holder := SxWeakHolder.alloc();
            target := SxWeakTarget.alloc();
            holder.target = target;
            target.release();

            // After release: target's refcount → 0 → target deallocates.
            // With weak: holder.target should read as null (auto-niled).
            // Without weak: holder.target reads as the stale pointer.
            read_back := holder.target;
            if read_back != null {
                print("FAIL: weak property didn't auto-nil after target dealloc\n");
                return 1;
            }

            holder.release();
        }

        print("weak property: ok\n");
    }
    inline if OS != .macos {
        print("skipped (not macos)\n");
    }
    0
}