/*
 * Copyright (c) 2008-2012 Juli Mallett. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <deque>
#include <fstream>
#include <sstream>

#include <config/config.h>
#include <config/config_class.h>
#include <config/config_class_log_mask.h>

#include <event/event_callback.h>

#include "wanproxy_config.h"
#include "wanproxy_config_class_codec.h"
#include "wanproxy_config_class_interface.h"
//#include "wanproxy_config_class_monitor.h"
#include "wanproxy_config_class_peer.h"
#include "wanproxy_config_class_proxy.h"
//#include "wanproxy_config_class_proxy_socks.h"

////////////////////////////////////////////////////////////////////////////////
//                                                                            //
// File:           wanproxy_config.cc                                         //
// Description:    high-level configuration parser                            //
// Project:        WANProxy XTech                                             //
// Adapted by:     Andreu Vidal Bramfeld-Software                             //
// Last modified:  2015-04-01                                                 //
//                                                                            //
////////////////////////////////////////////////////////////////////////////////

WANProxyConfig::WANProxyConfig(void)
: log_("/wanproxy/config"),
  config_(NULL)
{ }

WANProxyConfig::~WANProxyConfig()
{
	delete config_;
}

bool
WANProxyConfig::parse(std::deque<std::string>& tokens)
{
	std::string command = tokens.front();
	tokens.pop_front();

	if (command == "activate") {
		parse_activate(tokens);
	} else if (command == "create") {
		parse_create(tokens);
	} else if (command == "set") {
		parse_set(tokens);
	} else {
		tokens.clear();
		ERROR(log_) << "Unrecognized configuration command: " << command;
	}
	
	return tokens.empty();
}

void
WANProxyConfig::parse_activate(std::deque<std::string>& tokens)
{
	if (tokens.size() != 1) {
		ERROR(log_) << "Wrong number of words in activate (" << tokens.size() << ")";
		return;
	}

	if (!config_->activate(tokens[0])) {
		ERROR(log_) << "Object (" << tokens[0] << ") activation failed.";
		return;
	}
	tokens.clear();
}

void
WANProxyConfig::parse_create(std::deque<std::string>& tokens)
{
	if (tokens.size() != 2) {
		ERROR(log_) << "Wrong number of words in create (" << tokens.size() << ")";
		return;
	}

	if (!config_->create(tokens[0], tokens[1])) {
		ERROR(log_) << "Object (" << tokens[1] << ") could not be created.";
		return;
	}
	tokens.clear();
}

void
WANProxyConfig::parse_set(std::deque<std::string>& tokens)
{
	if (tokens.size() != 2) {
		ERROR(log_) << "Wrong number of words in set (" << tokens.size() << ")";
		return;
	}

	std::string::iterator dot = std::find(tokens[0].begin(), tokens[0].end(), '.');
	if (dot == tokens[0].end()) {
		ERROR(log_) << "Identifier (" << tokens[0] << ") is not an object member identifier.";
		return;
	}

	std::string object(tokens[0].begin(), dot);
	std::string member(dot + 1, tokens[0].end());
	if (object == "" || member == "") {
		ERROR(log_) << "Object (" << object << ") or member name (" << member << ") is empty.";
		return;
	}

	if (!config_->set(object, member, tokens[1])) {
		ERROR(log_) << "Set of object member (" << tokens[0] << ") failed.";
		return;
	}
	tokens.clear();
}

bool
WANProxyConfig::read_file(const std::string& path)
{
	delete config_;
	config_ = NULL;

	INFO(log_) << "Configuring WANProxy.";

	if (path.empty()) {
		ERROR(log_) << "No file name specified";
		return false;
	}

	std::fstream in;
	in.open(path.c_str(), std::ios::in);

	if (!in.good()) {
		ERROR(log_) << "Could not open file: " << path;
		return false;
	}

	config_ = new Config();
	config_->import(&config_class_log_mask);
	config_->import(&wanproxy_config_class_codec);
	config_->import(&wanproxy_config_class_interface);
	//config_->import(&wanproxy_config_class_monitor);
	config_->import(&wanproxy_config_class_peer);
	config_->import(&wanproxy_config_class_proxy);
	//config_->import(&wanproxy_config_class_proxy_socks);

	std::deque<std::string> tokens;

	while (in.good()) {
		std::string line;
		std::getline(in, line);

		if (line[0] == '#' || line.empty())
			continue;

		std::istringstream is(line);
		while (is.good()) {
			std::string word;
			is >> word;
			if (word.empty())
				continue;
			if (word[0] == '#')
				break;
			tokens.push_back(word);
		}
		if (tokens.empty())
			continue;
		if (!parse(tokens)) {
			ERROR(log_) << "Error in configuration directive: " << line;
			delete config_;
			config_ = NULL;
			return false;
		}
		ASSERT(log_, tokens.empty());
	}

	return true;
}