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/*
Minetest
Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser 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 "mapsector.h"
#include "exceptions.h"
#include "mapblock.h"
#include "serialization.h"

MapSector::MapSector(Map *parent, v2s16 pos, IGameDef *gamedef):
		m_parent(parent),
		m_pos(pos),
		m_gamedef(gamedef)
{
}

MapSector::~MapSector()
{
	deleteBlocks();
}

void MapSector::deleteBlocks()
{
	// Clear cache
	m_block_cache = nullptr;

	// Delete all
	for (auto &block : m_blocks) {
		delete block.second;
	}

	// Clear container
	m_blocks.clear();
}

MapBlock * MapSector::getBlockBuffered(s16 y)
{
	MapBlock *block;

	if (m_block_cache && y == m_block_cache_y) {
		return m_block_cache;
	}

	// If block doesn't exist, return NULL
	std::unordered_map<s16, MapBlock*>::const_iterator n = m_blocks.find(y);
	block = (n != m_blocks.end() ? n->second : nullptr);

	// Cache the last result
	m_block_cache_y = y;
	m_block_cache = block;

	return block;
}

MapBlock * MapSector::getBlockNoCreateNoEx(s16 y)
{
	return getBlockBuffered(y);
}