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/// @file WASM shim for kj/async-io.h
#pragma once
#include "async.h"

namespace kj {

// ---- Timer ----
struct Timer
{
    Promise<void> afterDelay(Duration)
    {
        return {};
    }
    template<typename T>
    Promise<T> timeoutAfter(Duration, Promise<T> p)
    {
        return p;
    }
};

// ---- AsyncIoProvider ----
struct AsyncIoProvider
{
    Timer & getTimer()
    {
        static Timer t;
        return t;
    }
};

// ---- UnixEventPort ----
struct UnixEventPort
{
    struct FdObserver
    {
        enum Flags { OBSERVE_READ = 1, OBSERVE_WRITE = 2, OBSERVE_READ_WRITE = 3 };
        FdObserver(UnixEventPort &, int, Flags) {}
        Promise<void> whenBecomesReadable()
        {
            return {};
        }
        Promise<void> whenBecomesWritable()
        {
            return {};
        }
    };
};

// ---- LowLevelAsyncIoProvider ----
struct LowLevelAsyncIoProvider
{
    UnixEventPort & getUnixEventPort()
    {
        static UnixEventPort p;
        return p;
    }
};

// ---- AsyncIoContext ----
// provider and lowLevelProvider are Own<> (pointer-like) in real KJ —
// the code accesses them as *aio.provider, *aio.lowLevelProvider.
// unixEventPort is kj::UnixEventPort& — the code accesses it directly.
struct AsyncIoContext
{
    // Use Own<> (unique_ptr) so *aio.provider dereferences correctly.
    Own<AsyncIoProvider> provider;
    Own<LowLevelAsyncIoProvider> lowLevelProvider;
    WaitScope waitScope;
    UnixEventPort unixEventPort;
};

inline AsyncIoContext setupAsyncIo()
{
    AsyncIoContext ctx;
    ctx.provider = std::make_unique<AsyncIoProvider>();
    ctx.lowLevelProvider = std::make_unique<LowLevelAsyncIoProvider>();
    return ctx;
}

struct AsyncObject
{};

} // namespace kj