// issue-0018: Dot-shorthand `.{...}` for struct with protocol field causes
// LLVM verification error when used in List(T).append from 2+ different
// struct methods.
//
// Trigger: TWO or more structs each with `List(Container)` calling
//          `.append(.{ child = d })` — using dot-shorthand.
//
// Works: Only 1 struct doing it, or using explicit `Container.{ child = d }`.
// Fails: 2+ structs → `Invalid InsertValueInst operands!`
//        `%si = insertvalue i64 undef, { ptr, ptr } %load, 0`
//
// Likely a monomorphization issue in `List(T).append` when the dot-shorthand
// type inference is resolved from multiple call sites.

#import "modules/std.sx";

Drawable :: protocol {
    draw :: () -> s32;
    name :: () -> string;
    layout :: (x: s32) -> s32;
    handle :: (event: s32) -> bool;
}

Circle :: struct { radius: s32; }
impl Drawable for Circle {
    draw :: (self: *Circle) -> s32 { self.radius; }
    name :: (self: *Circle) -> string { "circle"; }
    layout :: (self: *Circle, x: s32) -> s32 { x + self.radius; }
    handle :: (self: *Circle, event: s32) -> bool { event > 0; }
}

Square :: struct { side: s32; }
impl Drawable for Square {
    draw :: (self: *Square) -> s32 { self.side * self.side; }
    name :: (self: *Square) -> string { "square"; }
    layout :: (self: *Square, x: s32) -> s32 { x + self.side; }
    handle :: (self: *Square, event: s32) -> bool { event > 1; }
}

Rect :: struct {
    x: f32;
    y: f32;
    w: f32;
    h: f32;
    zero :: () -> Rect { Rect.{ x = 0.0, y = 0.0, w = 0.0, h = 0.0 }; }
}

Container :: struct {
    child: Drawable;
    computed_frame: Rect = .zero();
}

// Two different structs, each with List(Container), both calling .append(.{...})
// This mirrors VStack/HStack in the game.

StackA :: struct {
    children: List(Container);

    add :: (self: *StackA, d: Drawable) {
        // BUG: `.{ child = d }` causes LLVM error when 2+ structs do this
        self.children.append(.{ child = d });
    }
}

StackB :: struct {
    children: List(Container);

    add :: (self: *StackB, d: Drawable) {
        // BUG: second struct doing `.{ child = d }` triggers the error
        self.children.append(.{ child = d });
        // FIX: explicit `Container.{ child = d }` works
        // self.children.append(Container.{ child = d });
    }
}

main :: () -> void {
    c := Circle.{ radius = 42 };
    s := Square.{ side = 5 };

    a : StackA = .{};
    a.add(c);
    print("StackA: draw={}\n", a.children.items[0].child.draw());

    b : StackB = .{};
    b.add(s);
    print("StackB: draw={}\n", b.children.items[0].child.draw());

    print("OK\n");
}