// Phase 0 WASM hello-world.
//
// Scope (Rule R5: WASM never blocks shipping):
//   Prove the Emscripten toolchain compiles a C++ function callable from JS.
//   Nothing more. The real engine-in-WASM build happens in Phase 2 and depends
//   on PDFium/Skia/FreeType/HarfBuzz cross-compiled with Emscripten plus the
//   frozen interface contracts from Gate G0b — all of which are out of scope
//   for Phase 0.
//
// The exported C symbols here are loaded from JS via cwrap()/ccall(); see
// hello.test.mjs.

#include <cstdint>
#include <cstring>

#if defined(__EMSCRIPTEN__)
#include <emscripten/emscripten.h>
#define WASM_EXPORT EMSCRIPTEN_KEEPALIVE
#else
#define WASM_EXPORT
#endif

extern "C" {

// Smallest possible "does it run?" probe.
WASM_EXPORT int add(int a, int b) {
    return a + b;
}

// A version probe so the JS side can sanity-check the module it loaded.
WASM_EXPORT int hello_version() {
    return 1;
}

} // extern "C"