/******************************************************************************
 * Icinga 2                                                                   *
 * Copyright (C) 2012 Icinga Development Team (http://www.icinga.org/)        *
 *                                                                            *
 * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
 ******************************************************************************/

#include "icinga/macroprocessor.h"
#include "base/utility.h"
#include "base/array.h"
#include "base/objectlock.h"
#include <boost/tuple/tuple.hpp>
#include <boost/smart_ptr/make_shared.hpp>
#include <boost/foreach.hpp>

using namespace icinga;

/**
 * @threadsafety Always.
 */
Value MacroProcessor::ResolveMacros(const Value& cmd, const Dictionary::Ptr& macros,
    const MacroProcessor::EscapeCallback& escapeFn)
{
	Value result;

	ASSERT(macros->IsSealed());

	if (cmd.IsScalar()) {
		result = InternalResolveMacros(cmd, macros, escapeFn);
	} else if (cmd.IsObjectType<Array>()) {
		Array::Ptr resultArr = boost::make_shared<Array>();
		Array::Ptr arr = cmd;

		ObjectLock olock(arr);

		BOOST_FOREACH(const Value& arg, arr) {
			/* Note: don't escape macros here. */
			resultArr->Add(InternalResolveMacros(arg, macros, EscapeCallback()));
		}

		result = resultArr;
	} else {
		BOOST_THROW_EXCEPTION(std::invalid_argument("Command is not a string or array."));
	}

	return result;
}

/**
 * @threadsafety Always.
 */
String MacroProcessor::InternalResolveMacros(const String& str, const Dictionary::Ptr& macros,
    const MacroProcessor::EscapeCallback& escapeFn)
{
	size_t offset, pos_first, pos_second;
	offset = 0;

	String result = str;
	while ((pos_first = result.FindFirstOf("$", offset)) != String::NPos) {
		pos_second = result.FindFirstOf("$", pos_first + 1);

		if (pos_second == String::NPos)
			BOOST_THROW_EXCEPTION(std::runtime_error("Closing $ not found in macro format string."));

		String name = result.SubStr(pos_first + 1, pos_second - pos_first - 1);

		if (!macros || !macros->Contains(name))
			BOOST_THROW_EXCEPTION(std::runtime_error("Macro '" + name + "' is not defined."));

		String value = macros->Get(name);
		result.Replace(pos_first, pos_second - pos_first + 1, value);
		offset = pos_first + value.GetLength();
	}

	return result;
}

/**
 * @threadsafety Always.
 */
Dictionary::Ptr MacroProcessor::MergeMacroDicts(const std::vector<Dictionary::Ptr>& dicts)
{
	Dictionary::Ptr result = boost::make_shared<Dictionary>();

	BOOST_REVERSE_FOREACH(const Dictionary::Ptr& dict, dicts) {
		if (!dict)
			continue;

		ObjectLock olock(dict);

		String key;
		Value value;
		BOOST_FOREACH(boost::tie(key, value), dict) {
			if (!value.IsScalar())
				continue;

			result->Set(key, value);
		}
	}

	result->Seal();

	return result;
}