/*
 * Authored by Alex Hultman, 2018-2019.
 * Intellectual property of third-party.

 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at

 *     http://www.apache.org/licenses/LICENSE-2.0

 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* We are only allowed to depend on µWS and V8 in this layer. */
#include "App.h"
#include <v8.h>
#include <iostream>
#include <vector>
#include <type_traits>
using namespace v8;

void emptyNextTickQueue(Isolate *isolate);

/* These two are definitely static */
std::vector<UniquePersistent<Function>> nextTickQueue;
Isolate *isolate;

#include "Utilities.h"
#include "WebSocketWrapper.h"
#include "HttpResponseWrapper.h"
#include "HttpRequestWrapper.h"
#include "AppWrapper.h"

/* We are not compatible with Node.js nextTick for performance (and standalone) reasons */
void nextTick(const FunctionCallbackInfo<Value> &args) {
    nextTickQueue.emplace_back(UniquePersistent<Function>(isolate, Local<Function>::Cast(args[0])));
}

void emptyNextTickQueue(Isolate *isolate) {
    if (nextTickQueue.size()) {
        HandleScope hs(isolate);

        for (UniquePersistent<Function> &f : nextTickQueue) {
            Local<Function>::New(isolate, f)->Call(isolate->GetCurrentContext()->Global(), 0, nullptr);
            f.Reset();
        }

        nextTickQueue.clear();
    }
}

void Main(Local<Object> exports) {
    /* I guess we store this statically */
    isolate = exports->GetIsolate();

    /* Register our own nextTick handler */
    uWS::Loop::defaultLoop()->setPostHandler([](uWS::Loop *) {
        emptyNextTickQueue(isolate);
    });

    /* Also empty in pre, it doesn't matter */
    uWS::Loop::defaultLoop()->setPreHandler([](uWS::Loop *) {
        emptyNextTickQueue(isolate);
    });

    /* Hook up our timers */
    us_loop_integrate((us_loop *) uWS::Loop::defaultLoop());

    /* uWS namespace */
    exports->Set(String::NewFromUtf8(isolate, "App"), FunctionTemplate::New(isolate, uWS_App<uWS::App>)->GetFunction());
    exports->Set(String::NewFromUtf8(isolate, "SSLApp"), FunctionTemplate::New(isolate, uWS_App<uWS::SSLApp>)->GetFunction());
    exports->Set(String::NewFromUtf8(isolate, "nextTick"), FunctionTemplate::New(isolate, nextTick)->GetFunction());

    // these inits should probably happen elsewhere (in their respective struct's constructor)?

    /* The template for websockets */
    WebSocketWrapper::initWsTemplate<0>();
    WebSocketWrapper::initWsTemplate<1>();

    /* Initialize SSL and non-SSL templates */
    HttpResponseWrapper::initResTemplate<0>();
    HttpResponseWrapper::initResTemplate<1>();

    /* Init a shared request object */
    HttpRequestWrapper::initReqTemplate();
}

/* This is required when building as a Node.js addon */
#ifndef ADDON_IS_HOST
#include <node.h>
NODE_MODULE(uWS, Main)
#endif