// Optional `?f32` fields in struct literals — exhaustively combine null/value
// for both fields, through both direct calls and protocol dispatch.

#import "modules/std.sx";

ProposedSize :: struct {
    width: ?f32;
    height: ?f32;
}

// Direct function — does it work?
direct_size :: (proposal: ProposedSize) -> f32 {
    w := if pw := proposal.width { pw; } else { 100.0; };
    h := if ph := proposal.height { ph; } else { 100.0; };
    w + h;
}

Sizable :: protocol {
    size :: (proposal: ProposedSize) -> f32;
}

Widget :: struct {}

impl Sizable for Widget {
    size :: (self: *Widget, proposal: ProposedSize) -> f32 {
        w := if pw := proposal.width { pw; } else { 100.0; };
        h := if ph := proposal.height { ph; } else { 100.0; };
        w + h;
    }
}

main :: () -> void {
    // Test 1: Direct call
    print("=== Direct calls ===\n");
    d1 := direct_size(ProposedSize.{ width = 50.0, height = null });
    print("d1 = {}\n", d1);
    d2 := direct_size(ProposedSize.{ width = null, height = 50.0 });
    print("d2 = {}\n", d2);
    d3 := direct_size(ProposedSize.{ width = null, height = null });
    print("d3 = {}\n", d3);
    d4 := direct_size(ProposedSize.{ width = 50.0, height = 60.0 });
    print("d4 = {}\n", d4);

    // Test 2: Protocol dispatch
    print("=== Protocol dispatch ===\n");
    w := Widget.{};
    s : Sizable = w;
    r1 := s.size(ProposedSize.{ width = 50.0, height = null });
    print("r1 = {}\n", r1);
    r2 := s.size(ProposedSize.{ width = null, height = 50.0 });
    print("r2 = {}\n", r2);
    r3 := s.size(ProposedSize.{ width = null, height = null });
    print("r3 = {}\n", r3);
    r4 := s.size(ProposedSize.{ width = 50.0, height = 60.0 });
    print("r4 = {}\n", r4);
}
