/*
Weather Protocol plugin for Miranda IM
Copyright (C) 2002-2004 Calvin Che

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

/* This file contain the source related to downloading weather info
   from the web using netlib
*/

#include "stdafx.h"

char *szInfo;
char *szData;
HNETLIBUSER hNetlibUser;

// function to download webpage from the internet
// szUrl = URL of the webpage to be retrieved
// return value = 0 for success, 1 or HTTP error code for failure
// global var used: szData, szInfo = containing the retrieved data
//
int InternetDownloadFile(char *szUrl)
{
	NETLIBHTTPREQUEST nlhr = { 0 };

	// initialize the netlib request
	nlhr.cbSize = sizeof(nlhr);
	nlhr.requestType = REQUEST_GET;
	nlhr.flags = NLHRF_DUMPASTEXT;
	nlhr.szUrl = szUrl;
	// change the header so the plugin is pretended to be IE 6 + WinXP
	nlhr.headersCount++;
	nlhr.headers = (NETLIBHTTPHEADER*)malloc(sizeof(NETLIBHTTPHEADER)*nlhr.headersCount);
	nlhr.headers[nlhr.headersCount - 1].szName = "User-Agent";
	nlhr.headers[nlhr.headersCount - 1].szValue = NETLIB_USER_AGENT;

	// download the page
	NLHR_PTR nlhrReply(Netlib_HttpTransaction(hNetlibUser, &nlhr));
	if (nlhrReply == nullptr)
		return 1; // if the data does not downloaded successfully (ie. disconnected), then return 1 as error code

	// return error code if the recieved code is neither 200 OK or 302 Moved
	if (nlhrReply->resultCode != 200 && nlhrReply->resultCode != 302)
		return nlhrReply->resultCode;
	// if the recieved code is 200 OK
	else if (nlhrReply->resultCode == 200) {
		// allocate memory and save the retrieved data
		szData = (char *)malloc(mir_strlen(nlhrReply->pData) + 2);
		mir_strncpy(szData, nlhrReply->pData, mir_strlen(nlhrReply->pData));
	}
	// if the recieved code is 302 Moved, Found, etc
	else if (nlhrReply->resultCode == 302) {	// page moved
		// get the url for the new location and save it to szInfo
		// look for the reply header "Location"
		if (auto *pszHdr = Netlib_GetHeader(nlhrReply, "Location")) {
			szData = (char *)malloc(512);
			// add "Moved/Location:" in front of the new URL for identification
			mir_snprintf(szData, 512, "Moved/Location: %s\n", pszHdr);
		}

		// log the new url into netlib log
		Netlib_Log(hNetlibUser, szData);
	}

	// make a copy of the retrieved data, then free the memory of the http reply
	szInfo = szData;

	// the recieved data is empty, data was not recieved, so return an error code of 1
	if (!mir_strcmp(szInfo, ""))  return 1;
	return 0;
}

//============  NETLIB INITIALIZATION  ============

void NetlibInit()
{
	NETLIBUSER nlu = {};
	nlu.flags = NUF_OUTGOING | NUF_HTTPCONNS | NUF_NOHTTPSOPTION | NUF_UNICODE;
	nlu.szSettingsModule = MODNAME;
	nlu.szDescriptiveName.w = TranslateT("Non-IM Contacts");
	hNetlibUser = Netlib_RegisterUser(&nlu);
}