#include "Chunk.h"
#include "Constants.h"
#include "Globals.h"

#include "Registries.h"


Chunk::Chunk(Framework::Punkt location)
	: ReferenceCounter(),
	location(location),
	isLoading(0)
{}

Chunk::Chunk(Framework::Punkt location, Framework::StreamReader* zReader)
	: Chunk(location)
{
	load(zReader);
}

Chunk::~Chunk()
{}

void Chunk::api(char* message)
{
	// TODO: implement api
}

Block* Chunk::zBlockAt(Framework::Vec3<int> location)
{
	cs.lock();
	for (Block* b : blocks)
	{
		if (Framework::Vec3<int>((int)floor(b->getPos().x), (int)floor(b->getPos().y), (int)floor(b->getPos().z)) == location)
		{
			cs.unlock();
			return b;
		}
	}
	cs.unlock();
	return 0;
}

void Chunk::setBlock(Block* block)
{
	cs.lock();
	Framework::Vec3<int> pos = (Framework::Vec3<int>)block->getPos();
	for (Framework::Iterator<Block*> iterator = blocks.begin(); iterator; iterator++)
	{
		if (pos == (Framework::Vec3<int>)iterator->getPos())
		{
			iterator->release();
			iterator.set(block);
			cs.unlock();
			return;
		}
	}
	blocks.add(block);
	cs.unlock();
	if (!isLoading)
		updateVisibility();
}

void Chunk::removeBlock(Block* zBlock)
{
	cs.lock();
	int index = 0;
	for (Framework::Iterator<Block*> iterator = blocks.begin(); iterator; iterator++, index++)
	{
		if (zBlock == (Block*)iterator)
		{
			blocks.remove(index);
			cs.unlock();
			if (!isLoading)
				updateVisibility();
			return;
		}
	}
	cs.unlock();
}

void Chunk::load(Framework::StreamReader* zReader)
{
	isLoading = 1;
	Framework::Vec3<int> pos = { 0, 0, 0 };
	unsigned short id;
	zReader->lese((char*)&id, 2);
	while (id)
	{
		zReader->lese((char*)&pos.x, 4);
		zReader->lese((char*)&pos.y, 4);
		zReader->lese((char*)&pos.z, 4);
		if (blockTypes[id]->doesNeedInstance())
			setBlock(blockTypes[id]->createBlock({ pos.x + location.x - CHUNK_SIZE / 2, pos.y + location.y - CHUNK_SIZE / 2, pos.z }));
		zReader->lese((char*)&id, 2);
	}
	isLoading = 0;
	updateVisibility();
}

Framework::Punkt Chunk::getCenter() const
{
	return location;
}

Framework::Vec3<int> Chunk::getMin() const
{
	return { location.x - CHUNK_SIZE / 2, location.y - CHUNK_SIZE / 2, 0 };
}

Framework::Vec3<int> Chunk::getMax() const
{
	return { location.x + CHUNK_SIZE / 2, location.y + CHUNK_SIZE / 2, WORLD_HEIGHT };
}

void Chunk::forAll(std::function<void(Model3D*)> f)
{
	cs.lock();
	for (Block* b : blocks)
		f(b);
	cs.unlock();
}

void Chunk::updateVisibility()
{
	cs.lock();
	for (Block* b : blocks)
	{
		Framework::Vec3<int> pos = Framework::Vec3<int>((int)floor(b->getPos().x), (int)floor(b->getPos().y), (int)floor(b->getPos().z));
		for (int i = 0; i < 6; i++)
		{
			Block* c = zBlockAt(pos + getDirection(getDirectionFromIndex(i)));
			b->setSideVisible(getDirectionFromIndex(i), !c || c->isTransparent());
		}
	}
	cs.unlock();
}