/****************************************************************************
 Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
 
 http://www.cocos2d-x.org
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:
 
 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.
 
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 ****************************************************************************/

#include "network/CCHTTPRequest.h"
#include <stdio.h>
#include <iostream>
#include <thread>

#if CC_LUA_ENGINE_ENABLED > 0
extern "C" {
#include "lua.h"
}
#include "CCLuaEngine.h"
#endif
#include <sstream>


NS_CC_EXTRA_BEGIN

unsigned int HTTPRequest::s_id = 0;

HTTPRequest *HTTPRequest::createWithUrl(HTTPRequestDelegate *delegate,
                                            const char *url,
                                            int method)
{
    HTTPRequest *request = new HTTPRequest();
    request->initWithDelegate(delegate, url, method);
    request->autorelease();
    return request;
}

#if CC_LUA_ENGINE_ENABLED > 0
HTTPRequest *HTTPRequest::createWithUrlLua(LUA_FUNCTION listener,
                                               const char *url,
                                               int method)
{
    HTTPRequest *request = new HTTPRequest();
    request->initWithListener(listener, url, method);
    request->autorelease();
    return request;
}
#endif

bool HTTPRequest::initWithDelegate(HTTPRequestDelegate *delegate, const char *url, int method)
{
    _delegate = delegate;
    return initWithUrl(url, method);
}

#if CC_LUA_ENGINE_ENABLED > 0
bool HTTPRequest::initWithListener(LUA_FUNCTION listener, const char *url, int method)
{
    _listener = listener;
    return initWithUrl(url, method);
}
#endif

bool HTTPRequest::initWithUrl(const char *url, int method)
{
    CCAssert(url, "HTTPRequest::initWithUrl() - invalid url");
    _curl = curl_easy_init();
    curl_easy_setopt(_curl, CURLOPT_URL, url);
    curl_easy_setopt(_curl, CURLOPT_USERAGENT, "libcurl");
    curl_easy_setopt(_curl, CURLOPT_CONNECTTIMEOUT, DEFAULT_TIMEOUT);
    curl_easy_setopt(_curl, CURLOPT_TIMEOUT, DEFAULT_TIMEOUT);
    curl_easy_setopt(_curl, CURLOPT_NOSIGNAL, 1L);

    if (method == kCCHTTPRequestMethodPOST)
    {
        curl_easy_setopt(_curl, CURLOPT_POST, 1L);
        curl_easy_setopt(_curl, CURLOPT_COPYPOSTFIELDS, "");
    }
    
    ++s_id;
    // CCLOG("HTTPRequest[0x%04x] - create request with url: %s", s_id, url);
    return true;
}

HTTPRequest::~HTTPRequest(void)
{
    cleanup();
    if (_listener)
    {
#if (CC_LUA_ENGINE_ENABLED > 0)
        LuaEngine::getInstance()->removeScriptHandler(_listener);
#endif
    }
    // CCLOG("HTTPRequest[0x%04x] - request removed", s_id);
}

void HTTPRequest::setRequestUrl(const char *url)
{
    CCAssert(url, "HTTPRequest::setRequestUrl() - invalid url");
    _url = url;
    curl_easy_setopt(_curl, CURLOPT_URL, _url.c_str());
}

const string HTTPRequest::getRequestUrl(void)
{
    return _url;
}

void HTTPRequest::addRequestHeader(const char *header)
{
    CCAssert(_state == kCCHTTPRequestStateIdle, "HTTPRequest::addRequestHeader() - request not idle");
    CCAssert(header, "HTTPRequest::addRequestHeader() - invalid header");
    _headers.push_back(string(header));
}

void HTTPRequest::addPOSTValue(const char *key, const char *value)
{
    CCAssert(_state == kCCHTTPRequestStateIdle, "HTTPRequest::addPOSTValue() - request not idle");
    CCAssert(key, "HTTPRequest::addPOSTValue() - invalid key");
    _postFields[string(key)] = string(value ? value : "");
}

void HTTPRequest::setPOSTData(const char *data)
{
    CCAssert(_state == kCCHTTPRequestStateIdle, "HTTPRequest::setPOSTData() - request not idle");
    CCAssert(data, "HTTPRequest::setPOSTData() - invalid post data");
    _postFields.clear();
    curl_easy_setopt(_curl, CURLOPT_POST, 1L);
    curl_easy_setopt(_curl, CURLOPT_COPYPOSTFIELDS, data);
}

void HTTPRequest::addFormFile(const char *name, const char *filePath, const char *contentType)
{
	curl_formadd(&_formPost, &_lastPost,
		CURLFORM_COPYNAME, name,
		CURLFORM_FILE, filePath,
		CURLFORM_CONTENTTYPE, contentType,
		CURLFORM_END);
	//CCLOG("addFormFile %s %s %s", name, filePath, contentType);
}

void HTTPRequest::addFormContents(const char *name, const char *value)
{
	curl_formadd(&_formPost, &_lastPost,
		CURLFORM_COPYNAME, name,
		CURLFORM_COPYCONTENTS, value,
		CURLFORM_END);
	//CCLOG("addFormContents %s %s", name, value);
}

void HTTPRequest::setCookieString(const char *cookie)
{
    CCAssert(_state == kCCHTTPRequestStateIdle, "HTTPRequest::setAcceptEncoding() - request not idle");
    curl_easy_setopt(_curl, CURLOPT_COOKIE, cookie ? cookie : "");
}

const string HTTPRequest::getCookieString(void)
{
    CCAssert(_state == kCCHTTPRequestStateCompleted, "HTTPRequest::getResponseData() - request not completed");
    return _responseCookies;
}

void HTTPRequest::setAcceptEncoding(int acceptEncoding)
{
    CCAssert(_state == kCCHTTPRequestStateIdle, "HTTPRequest::setAcceptEncoding() - request not idle");
    switch (acceptEncoding)
    {
        case kCCHTTPRequestAcceptEncodingGzip:
            curl_easy_setopt(_curl, CURLOPT_ACCEPT_ENCODING, "gzip");
            break;
            
        case kCCHTTPRequestAcceptEncodingDeflate:
            curl_easy_setopt(_curl, CURLOPT_ACCEPT_ENCODING, "deflate");
            break;
            
        default:
            curl_easy_setopt(_curl, CURLOPT_ACCEPT_ENCODING, "identity");
    }
}

void HTTPRequest::setTimeout(int timeout)
{
    CCAssert(_state == kCCHTTPRequestStateIdle, "HTTPRequest::setTimeout() - request not idle");
    curl_easy_setopt(_curl, CURLOPT_CONNECTTIMEOUT, timeout);
    curl_easy_setopt(_curl, CURLOPT_TIMEOUT, timeout);
}

bool HTTPRequest::start(void)
{
    CCAssert(_state == kCCHTTPRequestStateIdle, "HTTPRequest::start() - request not idle");

    _state = kCCHTTPRequestStateInProgress;
    _curlState = kCCHTTPRequestCURLStateBusy;
    retain();

    curl_easy_setopt(_curl, CURLOPT_HTTP_CONTENT_DECODING, 1);
    curl_easy_setopt(_curl, CURLOPT_WRITEFUNCTION, writeDataCURL);
    curl_easy_setopt(_curl, CURLOPT_WRITEDATA, this);
    curl_easy_setopt(_curl, CURLOPT_HEADERFUNCTION, writeHeaderCURL);
    curl_easy_setopt(_curl, CURLOPT_WRITEHEADER, this);
    curl_easy_setopt(_curl, CURLOPT_NOPROGRESS, false);
    curl_easy_setopt(_curl, CURLOPT_PROGRESSFUNCTION, progressCURL);
    curl_easy_setopt(_curl, CURLOPT_PROGRESSDATA, this);
    curl_easy_setopt(_curl, CURLOPT_COOKIEFILE, "");

#ifdef _WINDOWS_

#if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)
	std::thread worker(requestCURL, this);
	worker.detach();

#else
    CreateThread(NULL,          // default security attributes
                 0,             // use default stack size
                 requestCURL,   // thread function name
                 this,          // argument to thread function
                 0,             // use default creation flags
                 NULL);
#endif // CC_TARGET_PLATFORM == CC_PLATFORM_WP8

#else
    pthread_create(&_thread, NULL, requestCURL, this);
    pthread_detach(_thread);
#endif

    Director::getInstance()->getScheduler()->scheduleUpdate(this, 0, false);
    // CCLOG("HTTPRequest[0x%04x] - request start", s_id);
    return true;
}

void HTTPRequest::cancel(void)
{
    _delegate = NULL;
    if (_state == kCCHTTPRequestStateIdle || _state == kCCHTTPRequestStateInProgress)
    {
        _state = kCCHTTPRequestStateCancelled;
    }
}

int HTTPRequest::getState(void)
{
    return _state;
}

int HTTPRequest::getResponseStatusCode(void)
{
    CCAssert(_state == kCCHTTPRequestStateCompleted, "Request not completed");
    return _responseCode;
}

const HTTPRequestHeaders &HTTPRequest::getResponseHeaders(void)
{
    CCAssert(_state == kCCHTTPRequestStateCompleted, "HTTPRequest::getResponseHeaders() - request not completed");
    return _responseHeaders;
}

const string HTTPRequest::getResponseHeadersString()
{
    string buf;
    for (HTTPRequestHeadersIterator it = _responseHeaders.begin(); it != _responseHeaders.end(); ++it)
    {
        buf.append(*it);
    }
    return buf;
}

const string HTTPRequest::getResponseString(void)
{
    CCAssert(_state == kCCHTTPRequestStateCompleted, "HTTPRequest::getResponseString() - request not completed");
    return string(_responseBuffer ? static_cast<char*>(_responseBuffer) : "");
}

void *HTTPRequest::getResponseData(void)
{
    CCAssert(_state == kCCHTTPRequestStateCompleted, "HTTPRequest::getResponseData() - request not completed");
    void *buff = malloc(_responseDataLength);
    memcpy(buff, _responseBuffer, _responseDataLength);
    return buff;
}

#if CC_LUA_ENGINE_ENABLED > 0
LUA_STRING HTTPRequest::getResponseDataLua(void)
{
    CCAssert(_state == kCCHTTPRequestStateCompleted, "HTTPRequest::getResponseDataLua() - request not completed");
    LuaStack *stack = LuaEngine::getInstance()->getLuaStack();
    stack->clean();
    stack->pushString(static_cast<char*>(_responseBuffer), (int)_responseDataLength);
    return 1;
}
#endif

int HTTPRequest::getResponseDataLength(void)
{
    CCAssert(_state == kCCHTTPRequestStateCompleted, "Request not completed");
    return (int)_responseDataLength;
}

size_t HTTPRequest::saveResponseData(const char *filename)
{
    CCAssert(_state == kCCHTTPRequestStateCompleted, "HTTPRequest::saveResponseData() - request not completed");
    
    FILE *fp = fopen(filename, "wb");
    CCAssert(fp, "HTTPRequest::saveResponseData() - open file failure");
    
    size_t writedBytes = _responseDataLength;
    if (writedBytes > 0)
    {
        fwrite(_responseBuffer, _responseDataLength, 1, fp);
    }
    fclose(fp);
    return writedBytes;
}

int HTTPRequest::getErrorCode(void)
{
    return _errorCode;
}

const string HTTPRequest::getErrorMessage(void)
{
    return _errorMessage;
}

HTTPRequestDelegate* HTTPRequest::getDelegate(void)
{
    return _delegate;
}

void HTTPRequest::checkCURLState(float dt)
{
    CC_UNUSED_PARAM(dt);
    if (_curlState != kCCHTTPRequestCURLStateBusy)
    {
        Director::getInstance()->getScheduler()->unscheduleAllForTarget(this);
        release();
    }
}

void HTTPRequest::update(float dt)
{
    if (_state == kCCHTTPRequestStateInProgress)
    {
#if CC_LUA_ENGINE_ENABLED > 0
        if (_listener)
        {
            LuaValueDict dict;
            
            dict["name"] = LuaValue::stringValue("progress");
            dict["total"] = LuaValue::intValue((int)_dltotal);
            dict["dltotal"] = LuaValue::intValue((int)_dlnow);
            dict["request"] = LuaValue::ccobjectValue(this, "HTTPRequest");
            
            LuaStack *stack = LuaEngine::getInstance()->getLuaStack();
            stack->clean();
            stack->pushLuaValueDict(dict);
            stack->executeFunctionByHandler(_listener, 1);
        }
#endif
        return;
    }
    
    Director::getInstance()->getScheduler()->unscheduleAllForTarget(this);
    if (_curlState != kCCHTTPRequestCURLStateIdle)
    {
        Director::getInstance()->getScheduler()->schedule(schedule_selector(HTTPRequest::checkCURLState), this, 0, false);
    }

    if (_state == kCCHTTPRequestStateCompleted)
    {
        // CCLOG("HTTPRequest[0x%04x] - request completed", s_id);
        if (_delegate) _delegate->requestFinished(this);
    }
    else
    {
        // CCLOG("HTTPRequest[0x%04x] - request failed", s_id);
        if (_delegate) _delegate->requestFailed(this);
    }

#if CC_LUA_ENGINE_ENABLED > 0
    if (_listener)
    {
        LuaValueDict dict;

        switch (_state)
        {
            case kCCHTTPRequestStateCompleted:
                dict["name"] = LuaValue::stringValue("completed");
                break;
                
            case kCCHTTPRequestStateCancelled:
                dict["name"] = LuaValue::stringValue("cancelled");
                break;
                
            case kCCHTTPRequestStateFailed:
                dict["name"] = LuaValue::stringValue("failed");
                break;
                
            default:
                dict["name"] = LuaValue::stringValue("unknown");
        }
        dict["request"] = LuaValue::ccobjectValue(this, "HTTPRequest");
        LuaStack *stack = LuaEngine::getInstance()->getLuaStack();
        stack->clean();
        stack->pushLuaValueDict(dict);
        stack->executeFunctionByHandler(_listener, 1);
    }
#endif
}

// instance callback

void HTTPRequest::onRequest(void)
{
    if (_postFields.size() > 0)
    {
        curl_easy_setopt(_curl, CURLOPT_POST, 1L);
        stringbuf buf;
        for (Fields::iterator it = _postFields.begin(); it != _postFields.end(); ++it)
        {
            char *part = curl_easy_escape(_curl, it->first.c_str(), 0);
            buf.sputn(part, strlen(part));
            buf.sputc('=');
            curl_free(part);
            
            part = curl_easy_escape(_curl, it->second.c_str(), 0);
            buf.sputn(part, strlen(part));
            curl_free(part);
            
            buf.sputc('&');
        }
        curl_easy_setopt(_curl, CURLOPT_COPYPOSTFIELDS, buf.str().c_str());
    }

    struct curl_slist *chunk = NULL;
    for (HTTPRequestHeadersIterator it = _headers.begin(); it != _headers.end(); ++it)
    {
        chunk = curl_slist_append(chunk, (*it).c_str());
    }

	if (_formPost)
	{
		curl_easy_setopt(_curl, CURLOPT_HTTPPOST, _formPost);
	}

    curl_slist *cookies = NULL;
    curl_easy_setopt(_curl, CURLOPT_HTTPHEADER, chunk);
    CURLcode code = curl_easy_perform(_curl);
    curl_easy_getinfo(_curl, CURLINFO_RESPONSE_CODE, &_responseCode);
    curl_easy_getinfo(_curl, CURLINFO_COOKIELIST, &cookies);

    if (cookies)
    {
        struct curl_slist *nc = cookies;
        stringbuf buf;
        while (nc)
        {
            buf.sputn(nc->data, strlen(nc->data));
            buf.sputc('\n');
            nc = nc->next;
        }
        _responseCookies = buf.str();
        curl_slist_free_all(cookies);
        cookies = NULL;
    }

    curl_easy_cleanup(_curl);
    _curl = NULL;
	if (_formPost)
	{
		curl_formfree(_formPost);
		_formPost = NULL;
	}
    curl_slist_free_all(chunk);
    
    _errorCode = code;
    _errorMessage = (code == CURLE_OK) ? "" : curl_easy_strerror(code);
    _state = (code == CURLE_OK) ? kCCHTTPRequestStateCompleted : kCCHTTPRequestStateFailed;
    _curlState = kCCHTTPRequestCURLStateClosed;
}

size_t HTTPRequest::onWriteData(void *buffer, size_t bytes)
{
    if (_responseDataLength + bytes + 1 > _responseBufferLength)
    {
        _responseBufferLength += BUFFER_CHUNK_SIZE;
        _responseBuffer = realloc(_responseBuffer, _responseBufferLength);
    }

    memcpy(static_cast<char*>(_responseBuffer) + _responseDataLength, buffer, bytes);
    _responseDataLength += bytes;
    static_cast<char*>(_responseBuffer)[_responseDataLength] = 0;
    return bytes;
}

size_t HTTPRequest::onWriteHeader(void *buffer, size_t bytes)
{
    char *headerBuffer = new char[bytes + 1];
    headerBuffer[bytes] = 0;
    memcpy(headerBuffer, buffer, bytes);    
    _responseHeaders.push_back(string(headerBuffer));
    delete []headerBuffer;
    return bytes;
}

int HTTPRequest::onProgress(double dltotal, double dlnow, double ultotal, double ulnow)
{
    _dltotal = dltotal;
    _dlnow = dlnow;
    _ultotal = ultotal;
    _ulnow = ulnow;
    
    return _state == kCCHTTPRequestStateCancelled ? 1: 0;
}

void HTTPRequest::cleanup(void)
{
    _state = kCCHTTPRequestStateCleared;
    _responseBufferLength = 0;
    _responseDataLength = 0;
    if (_responseBuffer)
    {
        free(_responseBuffer);
        _responseBuffer = NULL;
    }
    if (_curl)
    {
        curl_easy_cleanup(_curl);
        _curl = NULL;
    }
}

// curl callback

#ifdef _WINDOWS_
DWORD WINAPI HTTPRequest::requestCURL(LPVOID userdata)
{
    static_cast<HTTPRequest*>(userdata)->onRequest();
    return 0;
}
#else // _WINDOWS_
void *HTTPRequest::requestCURL(void *userdata)
{
    static_cast<HTTPRequest*>(userdata)->onRequest();
    return NULL;
}
#endif // _WINDOWS_

size_t HTTPRequest::writeDataCURL(void *buffer, size_t size, size_t nmemb, void *userdata)
{
    return static_cast<HTTPRequest*>(userdata)->onWriteData(buffer, size *nmemb);
}

size_t HTTPRequest::writeHeaderCURL(void *buffer, size_t size, size_t nmemb, void *userdata)
{
    return static_cast<HTTPRequest*>(userdata)->onWriteHeader(buffer, size *nmemb);
}

int HTTPRequest::progressCURL(void *userdata, double dltotal, double dlnow, double ultotal, double ulnow)
{
    return static_cast<HTTPRequest*>(userdata)->onProgress(dltotal, dlnow, ultotal, ulnow);
}

NS_CC_EXTRA_END