#include "curlapi.h"

Webternet g_webternet;

WebForm::WebForm() : first(NULL), last(NULL), lastError(CURL_FORMADD_OK)

{

}

bool WebForm::AddString(const char *name, const char *data)

{

	lastError = curl_formadd(&first,

		&last,

		CURLFORM_COPYNAME,

		name,

		CURLFORM_COPYCONTENTS,

		data,

		CURLFORM_END);

	return lastError == CURL_FORMADD_OK;

}

curl_httppost *WebForm::GetFormData()

{

	return first;

}

WebForm::~WebForm()

{

	curl_formfree(first);

}

WebTransfer *WebTransfer::CreateWebSession()

{

	CURL *curl;

	curl = curl_easy_init();

	if (curl == NULL)

	{

		return NULL;

	}

	WebTransfer *easy = new WebTransfer(curl);

	if (curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, easy->errorBuffer))

	{

		delete easy;

		return NULL;

	}

	curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1);

	curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1);

	return easy;

}

WebTransfer::WebTransfer(CURL *_curl)

{

	this->curl = _curl;

}

const char *WebTransfer::LastErrorMessage()

{

	return errorBuffer;

}

int WebTransfer::LastErrorCode()

{

	return lastError;

}

bool WebTransfer::SetHeaderReturn(bool recv_hdr)

{

	lastError = curl_easy_setopt(curl, CURLOPT_HEADER, recv_hdr ? 1 : 0);

	return lastError == 0;

}

bool WebTransfer::SetFailOnHTTPError(bool fail)

{

	lastError = curl_easy_setopt(curl, CURLOPT_FAILONERROR, fail ? 1 : 0);

	return lastError == 0;

}

static size_t curl_write_to_sm(void *ptr, size_t bytes, size_t nmemb, void *stream)

{

	void **userdata = (void **)stream;

	IWebTransfer *session = (IWebTransfer *)userdata[0];

	ITransferHandler *handler = (ITransferHandler *)userdata[1];

	DownloadWriteStatus status;

	status = handler->OnDownloadWrite(session, userdata[2], ptr, bytes, nmemb);

	if (status != DownloadWrite_Okay)

	{

		/* Return a differing amount */

		return (bytes == 0 || nmemb == 0) ? 1 : 0;

	}

	return bytes * nmemb;

}

bool WebTransfer::Download(const char *url, ITransferHandler *handler, void *data)

{

	lastError = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_write_to_sm);

	if (lastError)

	{

		return false;

	}

	void *userdata[3];

	userdata[0] = this;

	userdata[1] = handler;

	userdata[2] = data;

	lastError = curl_easy_setopt(curl, CURLOPT_WRITEDATA, userdata);

	if (lastError)

	{

		return false;

	}

	lastError = curl_easy_setopt(curl, CURLOPT_HTTPPOST, NULL);

	if (lastError)

	{

		return false;

	}

	lastError = curl_easy_setopt(curl, CURLOPT_URL, url);

	if (lastError)

	{

		return false;

	}

	lastError = curl_easy_perform(curl);

	return (lastError == 0);

}

bool WebTransfer::PostAndDownload(const char *url,

								  IWebForm *form,

								  ITransferHandler *handler,

								  void *data)

{

	WebForm *realform = (WebForm*)form;

	lastError = curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, curl_write_to_sm);

	if (lastError)

	{

		return false;

	}

	void *userdata[3];

	userdata[0] = this;

	userdata[1] = handler;

	userdata[2] = data;

	lastError = curl_easy_setopt(curl, CURLOPT_WRITEDATA, userdata);

	if (lastError)

	{

		return false;

	}

	lastError = curl_easy_setopt(curl, CURLOPT_HTTPPOST, realform->GetFormData());

	if (lastError)

	{

		return false;

	}

	lastError = curl_easy_setopt(curl, CURLOPT_URL, url);

	if (lastError)

	{

		return false;

	}

	lastError = curl_easy_perform(curl);

	return (lastError == 0);

}

WebTransfer::~WebTransfer()

{

	curl_easy_cleanup(curl);

}

unsigned int Webternet::GetInterfaceVersion()

{

	return SMINTERFACE_WEBTERNET_VERSION;

}

const char *Webternet::GetInterfaceName()

{

	return SMINTERFACE_WEBTERNET_NAME;

}

IWebTransfer *Webternet::CreateSession()

{

	return WebTransfer::CreateWebSession();

}

IWebForm *Webternet::CreateForm()

{

	return new WebForm();

}