////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2011, 2025, 2026
//
//    This file is part of Scorched3D.
//
//    Scorched3D 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.
//
//    Scorched3D 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
////////////////////////////////////////////////////////////////////////////////

#include <server/ServerDestination.hpp>
#include <engine/ModFiles.hpp>
#include <engine/ModFileEntryLoader.hpp>

ServerDestinationMod::ServerDestinationMod() :
	readyToReceive_(true),
	init_(false),
	totalLeft_(0)
{
	files_ = new std::list<ModIdentifierEntry>();
}

ServerDestinationMod::~ServerDestinationMod()
{
	delete files_;
	files_ = nullptr;
}

void ServerDestinationMod::addFile(ModIdentifierEntry &entry)
{
	files_->push_back(entry);
}

void ServerDestinationMod::rmFile(const char *file)
{
	std::list<ModIdentifierEntry>::iterator itor;
	for (itor = files_->begin();
		itor != files_->end();
		++itor)
	{
		ModIdentifierEntry &entry = (*itor);
		if (0 == strcmp(entry.fileName.c_str(), file))
		{
			files_->erase(itor);
			break;
		}
	}

	if (files_->empty()) sendBuffer_.clear();
	else sendBuffer_.reset();
}

ModIdentifierEntry *ServerDestinationMod::getNextFile()
{
	if ( files_->empty() ) return nullptr;
	ModIdentifierEntry &entry = files_->front();

	if (lastFile_ != entry.fileName ||
		sendBuffer_.getBufferUsed() == 0)
	{
		lastFile_ = entry.fileName;
		ModFileEntryLoader::loadModFile(sendBuffer_, S3D::getModFile(lastFile_));
	}
	
	return &entry;
}

static struct AllowedStateTransitions
{
	ServerDestination::State from, to;
} allowedStateTransitions[] = {
	// clang-format off
	// uncrustify off
	{ ServerDestination::sDownloadingMod,  ServerDestination::sInitializingMod },
	{ ServerDestination::sInitializingMod, ServerDestination::sLoadingLevel    },
	{ ServerDestination::sLoadingLevel,    ServerDestination::sFinished        },
	{ ServerDestination::sFinished,        ServerDestination::sLoadingLevel    },
	// uncrustify on
	// clang-format on
};

ServerDestination::ServerDestination(
	unsigned int destinationId,
	unsigned int ipAddress
) :
	state_(sDownloadingMod),
	destinationId_(destinationId),
	ipAddress_(ipAddress),
	levelNumber_(0),
	admin_(false),
	adminTries_(0),
	ping_( 25, fixed( true, fixed::FIXED_RESOLUTION / Sint64(25) ) )
{}

ServerDestination::~ServerDestination()
{}

void ServerDestination::setState(State s)
{
	for (
		size_t i = 0;
		i < sizeof(allowedStateTransitions) / sizeof(AllowedStateTransitions);
		i++
	)
	{
		if (
			state_ == allowedStateTransitions[i].from
			&& s == allowedStateTransitions[i].to
		)
		{
			state_ = s;
			break;
		}
	}
	if (state_ == sLoadingLevel) lastSentPingTime_ = 0;
}
