/** 
 * @file llweb.cpp
 * @brief Functions dealing with web browsers
 * @author James Cook
 *
 * $LicenseInfo:firstyear=2006&license=viewergpl$
 * 
 * Copyright (c) 2006-2009, Linden Research, Inc.
 * 
 * Second Life Viewer Source Code
 * The source code in this file ("Source Code") is provided by Linden Lab
 * to you under the terms of the GNU General Public License, version 2.0
 * ("GPL"), unless you have obtained a separate licensing agreement
 * ("Other License"), formally executed by you and Linden Lab.  Terms of
 * the GPL can be found in doc/GPL-license.txt in this distribution, or
 * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
 * 
 * There are special exceptions to the terms and conditions of the GPL as
 * it is applied to this Source Code. View the full text of the exception
 * in the file doc/FLOSS-exception.txt in this software distribution, or
 * online at
 * http://secondlifegrid.net/programs/open_source/licensing/flossexception
 * 
 * By copying, modifying or distributing this software, you acknowledge
 * that you have read and understood your obligations described above,
 * and agree to abide by those obligations.
 * 
 * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
 * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
 * COMPLETENESS OR PERFORMANCE.
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llweb.h"

// Library includes
#include "llwindow.h"	// spawnWebBrowser()

#include "llagent.h"
#include "llappviewer.h"
#include "llfloaterwebcontent.h"
#include "hippogridmanager.h"
#include "llparcel.h"
#include "llsd.h"
#include "llalertdialog.h"
#include "llui.h"
#include "lluri.h"
#include "llversioninfo.h"
#include "llviewercontrol.h"
#include "llviewernetwork.h"
#include "llviewerparcelmgr.h"
#include "llviewerregion.h"
#include "llviewerwindow.h"
#include "llnotificationsutil.h"

bool on_load_url_external_response(const LLSD& notification, const LLSD& response, bool async );


class URLLoader : public LLAlertDialog::URLLoader
{
	virtual void load(const std::string& url , bool force_open_externally)
	{
		if (force_open_externally)
		{
			LLWeb::loadURLExternal(url);
		}
		else
		{
			LLWeb::loadURL(url);
		}
	}
};
static URLLoader sAlertURLLoader;


// static
void LLWeb::initClass()
{
	LLAlertDialog::setURLLoader(&sAlertURLLoader);
}




// static
void LLWeb::loadURL(const std::string& url, const std::string& target, const std::string& uuid)
{
	if(target == "_internal")
	{
		// Force load in the internal browser, as if with a blank target.
		loadURLInternal(url, "", uuid);
	}
	else if (gSavedSettings.getBOOL("UseExternalBrowser") || (target == "_external"))
	{
		loadURLExternal(url);
	}
	else
	{
		loadURLInternal(url, target, uuid);
	}
}

// static
// Explicitly open a Web URL using the Web content floater
void LLWeb::loadURLInternal(const std::string &url, const std::string& target, const std::string& uuid)
{
	LLFloaterWebContent::Params p;
	p.url(url).target(target).id(uuid);
	LLFloaterWebContent::showInstance("web_content", p);
}

// static
void LLWeb::loadURLExternal(const std::string& url, const std::string& uuid)
{
	loadURLExternal(url, true, uuid);
}

// static
void LLWeb::loadURLExternal(const std::string& url, bool async, const std::string& uuid)
{
	// Act like the proxy window was closed, since we won't be able to track targeted windows in the external browser.
	LLViewerMedia::proxyWindowClosed(uuid);
	
	if(gSavedSettings.getBOOL("DisableExternalBrowser"))
	{
		// Don't open an external browser under any circumstances.
		LL_WARNS() << "Blocked attempt to open external browser." << LL_ENDL;
		return;
	}
	
	LLSD payload;
	payload["url"] = url;
	LLNotificationsUtil::add( "WebLaunchExternalTarget", LLSD(), payload, boost::bind(on_load_url_external_response, _1, _2, async));
}

// static 
bool on_load_url_external_response(const LLSD& notification, const LLSD& response, bool async )
{
	S32 option = LLNotificationsUtil::getSelectedOption(notification, response);
	if ( 0 == option )
	{
		LLSD payload = notification["payload"];
		std::string url = payload["url"].asString();
		std::string escaped_url = LLWeb::escapeURL(url);
		if (gViewerWindow)
		{
			gViewerWindow->getWindow()->spawnWebBrowser(escaped_url, async);
		}
	}
	return false;
}

// static
std::string LLWeb::curlEscape(const std::string& url)
{
	static const char hex[] = "0123456789ABCDEF";
	std::stringstream escaped_url;
	for (std::string::const_iterator iter = url.begin(); iter != url.end(); ++iter)
	{
		switch(*iter) {
			case '0': case '1': case '2': case '3': case '4':
			case '5': case '6': case '7': case '8': case '9':
			case 'a': case 'b': case 'c': case 'd': case 'e':
			case 'f': case 'g': case 'h': case 'i': case 'j':
			case 'k': case 'l': case 'm': case 'n': case 'o':
			case 'p': case 'q': case 'r': case 's': case 't':
			case 'u': case 'v': case 'w': case 'x': case 'y': case 'z':
			case 'A': case 'B': case 'C': case 'D': case 'E':
			case 'F': case 'G': case 'H': case 'I': case 'J':
			case 'K': case 'L': case 'M': case 'N': case 'O':
			case 'P': case 'Q': case 'R': case 'S': case 'T':
			case 'U': case 'V': case 'W': case 'X': case 'Y': case 'Z':
				escaped_url << (*iter);
				break;
			default:
				unsigned char c = (unsigned char)(*iter);
				escaped_url << '%' << hex[c>>4] << hex[c&0xF];
		}
	}
	return escaped_url.str();
}

// static
std::string LLWeb::escapeURL(const std::string& url)
{
	// The CURL curl_escape() function escapes colons, slashes,
	// and all characters but A-Z and 0-9.  Do a cheesy mini-escape.
	std::string escaped_url;
	S32 len = url.length();
	for (S32 i = 0; i < len; i++)
	{
		char c = url[i];
		if (c == ' ')
		{
			escaped_url += "%20";
		}
		else if (c == '\\')
		{
			escaped_url += "%5C";
		}
		else
		{
			escaped_url += c;
		}
	}
	return escaped_url;
}

std::string getLoginUriDomain();
//static
std::string LLWeb::expandURLSubstitutions(const std::string &url,
										  const LLSD &default_subs)
{
	LLSD substitution = default_subs;
	substitution["VERSION"] = LLVersionInfo::getVersion();
	substitution["VERSION_MAJOR"] = LLVersionInfo::getMajor();
	substitution["VERSION_MINOR"] = LLVersionInfo::getMinor();
	substitution["VERSION_PATCH"] = LLVersionInfo::getPatch();
	substitution["VERSION_BUILD"] = LLVersionInfo::getBuild();
	substitution["CHANNEL"] = LLVersionInfo::getChannel();
	const HippoGridInfo* grid(gHippoGridManager->getCurrentGrid());
	std::string gridId(grid->isSecondLife() ? getLoginUriDomain() : grid->getGridName());
	if (grid->isSecondLife())
	{
		gridId = gridId.substr(0, gridId.find('.'));
	}

	substitution["GRID"] = gridId;
	substitution["GRID_LOWERCASE"] =  utf8str_tolower(gridId);
	substitution["OS"] = LLAppViewer::instance()->getOSInfo().getOSStringSimple();
	substitution["SESSION_ID"] = gAgent.getSessionID();
	substitution["FIRST_LOGIN"] = gAgent.isFirstLogin();

	// work out the current language
	std::string lang = LLUI::getLanguage();
	if (lang == "en-us")
	{
		// *HACK: the correct fix is to change English.lproj/language.txt,
		// but we're late in the release cycle and this is a less risky fix
		lang = "en";
	}
	substitution["LANGUAGE"] = lang;

	// find the region ID
	LLUUID region_id;
	LLViewerRegion *region = gAgent.getRegion();
	if (region)
	{
		region_id = region->getRegionID();
	}
	substitution["REGION_ID"] = region_id;

	// find the parcel local ID
	S32 parcel_id = 0;
	LLParcel* parcel = LLViewerParcelMgr::getInstance()->getAgentParcel();
	if (parcel)
	{
		parcel_id = parcel->getLocalID();
	}
	substitution["PARCEL_ID"] = fmt::to_string(parcel_id);
	// expand all of the substitution strings and escape the url
	std::string expanded_url = url;
	LLStringUtil::format(expanded_url, substitution);

	return LLWeb::escapeURL(expanded_url);
}
