#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()
{
	char msg = 1; // remove observer
	World::INSTANCE->zClient()->chunkAPIRequest(location, &msg, 1);
}

void Chunk::api(char* message)
{
	switch (message[0])
	{
	case 0: // set block
	{
		int index = *(int*)(message + 1);
		int id = *(int*)(message + 5);
		Framework::Vec3<int> location((index / WORLD_HEIGHT) / CHUNK_SIZE, (index / WORLD_HEIGHT) % CHUNK_SIZE, index % WORLD_HEIGHT);
		location.x += this->location.x - CHUNK_SIZE / 2;
		location.y += this->location.y - CHUNK_SIZE / 2;
		if (blockTypes[id]->doesNeedInstance())
		{
			Block* zB = blockTypes[id]->createBlock(location);
			setBlock(zB);
		}
		else
		{
			Block* zB = zBlockAt(location);
			if (zB)
				removeBlock(zB);
		}
		break;
	}
	case 1: // update light
	{
		int index = *(int*)(message + 1);
		Framework::Vec3<int> location((index / WORLD_HEIGHT) / CHUNK_SIZE, (index / WORLD_HEIGHT) % CHUNK_SIZE, index % WORLD_HEIGHT);
		for (int i = 0; i < 6; i++)
		{
			Framework::Vec3<int> pos = location + getDirection(getDirectionFromIndex(i));
			if (pos.z >= 0 && pos.z < WORLD_HEIGHT)
			{
				if (pos.x >= 0 && pos.x < CHUNK_SIZE && pos.y >= 0 && pos.y < CHUNK_SIZE)
				{
					pos.x += this->location.x - CHUNK_SIZE / 2;
					pos.y += this->location.y - CHUNK_SIZE / 2;
					Block* zB = zBlockAt(pos);
					if (zB)
					{
						bool visible = zB->isVisible();
						zB->setLightData(getOppositeDirection(getDirectionFromIndex(i)), (unsigned char*)(message + 5));
						if (zB->isVisible() != visible)
						{
							vcs.lock();
							if (zB->isVisible())
								visibleBlocks.add(zB);
							else
							{
								for (Framework::Iterator<Block*> iterator = visibleBlocks.begin(); iterator; iterator++)
								{
									if (zB == (Block*)iterator)
									{
										iterator.remove();
										break;
									}
								}
							}
							vcs.unlock();
						}
					}
				}
				else
				{
					pos.x += this->location.x - CHUNK_SIZE / 2;
					pos.y += this->location.y - CHUNK_SIZE / 2;
					Block* zB = World::INSTANCE->zBlockAt(pos);
					if (zB)
					{
						bool visible = zB->isVisible();
						zB->setLightData(getOppositeDirection(getDirectionFromIndex(i)), (unsigned char*)(message + 5));
						if (zB->isVisible() != visible)
						{
							Chunk* c = World::INSTANCE->zChunk(World::INSTANCE->getChunkCenter(pos.x, pos.y));
							c->vcs.lock();
							if (zB->isVisible())
								c->visibleBlocks.add(zB);
							else
							{
								for (Framework::Iterator<Block*> iterator = c->visibleBlocks.begin(); iterator; iterator++)
								{
									if (zB == (Block*)iterator)
									{
										iterator.remove();
										break;
									}
								}
							}
							c->vcs.unlock();
						}
					}
				}
			}
		}
	}
	}
}

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

void Chunk::setBlock(Block* block)
{
	cs.lock();
	Framework::Vec3<int> pos = block->getLocation();
	for (Framework::Iterator<Block*> iterator = blocks.begin(); iterator; iterator++)
	{
		if (pos == iterator->getLocation())
		{
			vcs.lock();
			for (Framework::Iterator<Block*> vi = visibleBlocks.begin(); vi; vi++)
			{
				if ((Block*)iterator == (Block*)vi)
				{
					iterator.remove();
					break;
				}
			}
			vcs.unlock();
			iterator->release();
			iterator.set(block);
			break;
		}
	}
	blocks.add(block);
	cs.unlock();
}

void Chunk::removeBlock(Block* zBlock)
{
	cs.lock();
	vcs.lock();
	for (Framework::Iterator<Block*> iterator = visibleBlocks.begin(); iterator; iterator++)
	{
		if (zBlock == (Block*)iterator)
		{
			iterator.remove();
			break;
		}
	}
	vcs.unlock();
	for (Framework::Iterator<Block*> iterator = blocks.begin(); iterator; iterator++)
	{
		if (zBlock == (Block*)iterator)
		{
			iterator.remove();
			break;
		}
	}
	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)
	{
		int index;
		zReader->lese((char*)&index, 4);
		pos = Vec3<int>((index / WORLD_HEIGHT) / CHUNK_SIZE, (index / WORLD_HEIGHT) % CHUNK_SIZE, index % WORLD_HEIGHT);
		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);
	}
	int index = 0;
	// light
	zReader->lese((char*)&index, 4);
	char lightData[6];
	while (index >= 0)
	{
		zReader->lese(lightData, 6);
		Framework::Vec3<int> location((index / WORLD_HEIGHT) / CHUNK_SIZE, (index / WORLD_HEIGHT) % CHUNK_SIZE, index % WORLD_HEIGHT);
		for (int i = 0; i < 6; i++)
		{
			Framework::Vec3<int> pos = location + getDirection(getDirectionFromIndex(i));
			if (pos.z >= 0 && pos.z < WORLD_HEIGHT)
			{
				if (pos.x >= 0 && pos.x < CHUNK_SIZE && pos.y >= 0 && pos.y < CHUNK_SIZE)
				{
					pos.x += this->location.x - CHUNK_SIZE / 2;
					pos.y += this->location.y - CHUNK_SIZE / 2;
					Block* zB = zBlockAt(pos);
					if (zB)
					{
						bool visible = zB->isVisible();
						zB->setLightData(getOppositeDirection(getDirectionFromIndex(i)), (unsigned char*)lightData);
						if (zB->isVisible() && !visible)
							visibleBlocks.add(zB);
					}
				}
				else
				{
					pos.x += this->location.x - CHUNK_SIZE / 2;
					pos.y += this->location.y - CHUNK_SIZE / 2;
					Block* zB = World::INSTANCE->zBlockAt(pos);
					if (zB)
					{
						bool visible = zB->isVisible();
						zB->setLightData(getOppositeDirection(getDirectionFromIndex(i)), (unsigned char*)lightData);
						if (zB->isVisible() && !visible)
						{
							Chunk* c = World::INSTANCE->zChunk(World::INSTANCE->getChunkCenter(pos.x, pos.y));
							c->vcs.lock();
							c->visibleBlocks.add(zB);
							c->vcs.unlock();
						}
					}
				}
			}
		}
		zReader->lese((char*)&index, 4);
	}
	isLoading = 0;
}

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)
{
	vcs.lock();
	for (Block* b : visibleBlocks)
		f(b);
	vcs.unlock();
}