#include "lib_handle.h"
#include <uv.h>

using namespace v8;
using std::unique_ptr;

namespace ivm {

/**
 * Stateless transferable interface
 */
auto LibHandle::LibTransferable::TransferIn() -> Local<Value> {
	return ClassHandle::NewInstance<LibHandle>();
}

/**
 * ivm.lib API container
 */
auto LibHandle::Definition() -> Local<FunctionTemplate> {
	return Inherit<TransferableHandle>(MakeClass(
		"Lib", nullptr,
		"hrtime", MemberFunction<decltype(&LibHandle::Hrtime), &LibHandle::Hrtime>{},
		"privateSymbol", MemberFunction<decltype(&LibHandle::PrivateSymbol), &LibHandle::PrivateSymbol>{},
		"testHang", MemberFunction<decltype(&LibHandle::TestHang), &LibHandle::TestHang>{},
		"testOOM", MemberFunction<decltype(&LibHandle::TestOOM), &LibHandle::TestOOM>{}
	));
}

auto LibHandle::TransferOut() -> unique_ptr<Transferable> {
	return std::make_unique<LibTransferable>();
}

// NOLINTNEXTLINE(readability-convert-member-functions-to-static)
auto LibHandle::Hrtime(MaybeLocal<Array> maybe_diff) -> Local<Value> {
	Isolate* isolate = Isolate::GetCurrent();
	Local<Context> context = isolate->GetCurrentContext();
	uint64_t time = uv_hrtime();
	constexpr auto kNanos = (uint64_t)1e9;
	Local<Array> diff;
	if (maybe_diff.ToLocal(&diff)) {
		if (diff->Length() != 2) {
			throw RuntimeTypeError("hrtime diff must be 2-length array");
		}
		uint64_t time_diff = Unmaybe(diff->Get(context, 0)).As<Uint32>()->Value() * kNanos + Unmaybe(diff->Get(context, 1)).As<Uint32>()->Value();
		time -= time_diff;
	}
	Local<Array> ret = Array::New(isolate, 2);
	Unmaybe(ret->Set(context, 0, Uint32::New(isolate, (uint32_t)(time / kNanos))));
	Unmaybe(ret->Set(context, 1, Uint32::New(isolate, (uint32_t)(time - (time / kNanos) * kNanos))));
	return ret;
}

// NOLINTNEXTLINE(readability-convert-member-functions-to-static)
auto LibHandle::PrivateSymbol(MaybeLocal<String> maybe_name) -> Local<Value> {
	Local<String> name{};
	if (maybe_name.ToLocal(&name)) { /* nothing */ }
	auto symbol = Private::New(Isolate::GetCurrent(), name);
	return *reinterpret_cast<Local<Value>*>(&symbol);
}

// NOLINTNEXTLINE(readability-convert-member-functions-to-static)
auto LibHandle::TestHang() -> Local<Value> {
	auto deadline = std::chrono::steady_clock::now() + std::chrono::seconds(60);
	while (std::chrono::steady_clock::now() < deadline) {}
	return Undefined(Isolate::GetCurrent());
}

// NOLINTNEXTLINE(readability-convert-member-functions-to-static)
auto LibHandle::TestOOM() -> Local<Value> {
	Isolate* isolate = Isolate::GetCurrent();
	for (;;) {
		Array::New(isolate, 128);
	}
	return {};
}

} // namespace ivm