/*****************************************************************************
 * CURLFTPTransport functions
 *
 */
 

#include <curlftpt.h>

#include <fcntl.h>

#include <curl/curl.h>
#include <curl/types.h>
#include <curl/easy.h>

#include <swlog.h>

SWORD_NAMESPACE_START


struct FtpFile {
  const char *filename;
  FILE *stream;
  SWBuf *destBuf;
};


int my_fwrite(void *buffer, size_t size, size_t nmemb, void *stream);
int my_fprogress(void *clientp, double dltotal, double dlnow, double ultotal, double ulnow);

static CURLFTPTransport_init _CURLFTPTransport_init;

CURLFTPTransport_init::CURLFTPTransport_init() {
	//curl_global_init(CURL_GLOBAL_DEFAULT);  // curl_easy_init automatically calls it if needed
}

CURLFTPTransport_init::~CURLFTPTransport_init() {
	curl_global_cleanup();
}

int my_fwrite(void *buffer, size_t size, size_t nmemb, void *stream) {
	struct FtpFile *out=(struct FtpFile *)stream;
	if (out && !out->stream && !out->destBuf) {
		/* open file for writing */
		out->stream=fopen(out->filename, "wb");
		if (!out->stream)
			return -1; /* failure, can't open file to write */
	}
	if (out->destBuf) {
		int s = out->destBuf->size();
		out->destBuf->size(s+(size*nmemb));
		memcpy(out->destBuf->getRawData()+s, buffer, size*nmemb);
		return nmemb;
	}
	return fwrite(buffer, size, nmemb, out->stream);
}


int my_fprogress(void *clientp, double dltotal, double dlnow, double ultotal, double ulnow) {
	if (clientp) {
		((StatusReporter *)clientp)->statusUpdate(dltotal, dlnow);
	}
	return 0;
}


static int my_trace(CURL *handle, curl_infotype type, unsigned char *data, size_t size, void *userp) {
	SWBuf header;
	(void)userp; /* prevent compiler warning */
	(void)handle; /* prevent compiler warning */

	switch (type) {
	case CURLINFO_TEXT: header = "TEXT"; break;
	case CURLINFO_HEADER_OUT: header = "=> Send header"; break;
	case CURLINFO_HEADER_IN: header = "<= Recv header"; break;
	
	// these we don't want to log (HUGE)
	case CURLINFO_DATA_OUT: header = "=> Send data";
	case CURLINFO_SSL_DATA_OUT: header = "=> Send SSL data";
	case CURLINFO_DATA_IN: header = "<= Recv data"; 
	case CURLINFO_SSL_DATA_IN: header = "<= Recv SSL data";
	default: /* in case a new one is introduced to shock us */
		return 0;
	}
	
	if (size > 120) size = 120;
	SWBuf text;
	text.size(size);
	memcpy(text.getRawData(), data, size);
	SWLog::getSystemLog()->logDebug("CURLFTPTransport: %s: %s", header.c_str(), text.c_str());
	return 0;
}

CURLFTPTransport::CURLFTPTransport(const char *host, StatusReporter *sr) : FTPTransport(host, sr) {
	session = (CURL *)curl_easy_init();
}


CURLFTPTransport::~CURLFTPTransport() {
	curl_easy_cleanup(session);
}


char CURLFTPTransport::getURL(const char *destPath, const char *sourceURL, SWBuf *destBuf) {
	signed char retVal = 0;
	struct FtpFile ftpfile = {destPath, 0, destBuf};

	CURLcode res;
	
	if (session) {
		curl_easy_setopt(session, CURLOPT_URL, sourceURL);
	
		curl_easy_setopt(session, CURLOPT_USERPWD, "ftp:installmgr@user.com");
		curl_easy_setopt(session, CURLOPT_WRITEFUNCTION, my_fwrite);
		if (!passive)
			curl_easy_setopt(session, CURLOPT_FTPPORT, "-");
		curl_easy_setopt(session, CURLOPT_NOPROGRESS, 0);
		curl_easy_setopt(session, CURLOPT_PROGRESSDATA, statusReporter);
		curl_easy_setopt(session, CURLOPT_PROGRESSFUNCTION, my_fprogress);
		curl_easy_setopt(session, CURLOPT_DEBUGFUNCTION, my_trace);
		/* Set a pointer to our struct to pass to the callback */
		curl_easy_setopt(session, CURLOPT_FILE, &ftpfile);

		/* Switch on full protocol/debug output */
		curl_easy_setopt(session, CURLOPT_VERBOSE, true);
		
		/* FTP connection settings */

#if (LIBCURL_VERSION_MAJOR > 7) || \
   ((LIBCURL_VERSION_MAJOR == 7) && (LIBCURL_VERSION_MINOR > 10)) || \
   ((LIBCURL_VERSION_MAJOR == 7) && (LIBCURL_VERSION_MINOR == 10) && (LIBCURL_VERSION_PATCH >= 5))
#      define EPRT_AVAILABLE 1
#endif

#ifdef EPRT_AVAILABLE
		curl_easy_setopt(session, CURLOPT_FTP_USE_EPRT, 0);
		SWLog::getSystemLog()->logDebug("***** using CURLOPT_FTP_USE_EPRT\n");
#endif

		
		SWLog::getSystemLog()->logDebug("***** About to perform curl easy action. \n");
		SWLog::getSystemLog()->logDebug("***** destPath: %s \n", destPath);
		SWLog::getSystemLog()->logDebug("***** sourceURL: %s \n", sourceURL);
		res = curl_easy_perform(session);
		SWLog::getSystemLog()->logDebug("***** Finished performing curl easy action. \n");

		if(CURLE_OK != res) {
			retVal = -1;
		}
	}

	if (ftpfile.stream)
		fclose(ftpfile.stream); /* close the local file */

	return retVal;
}


SWORD_NAMESPACE_END