#include "Chunk.h"
#include "Constants.h"
#include "Game.h"


Chunk::Chunk( Framework::Punkt location, Game *zGame, int dimensionId )
    : ReferenceCounter(),
    zGame( zGame ),
    dimensionId( dimensionId ),
    location( location )
{
    blocks = new Block * [ CHUNK_SIZE * CHUNK_SIZE * WORLD_HEIGHT ];
    Block *val = (Block *)AIR_BLOCK;
    std::uninitialized_fill_n( blocks, CHUNK_SIZE * CHUNK_SIZE * WORLD_HEIGHT, val );
    zNeighbours[ 0 ] = 0;
    zNeighbours[ 1 ] = 0;
    zNeighbours[ 2 ] = 0;
    zNeighbours[ 3 ] = 0;
}

Chunk::Chunk( Framework::Punkt location, Game *zGame, int dimensionId, Framework::StreamReader *zReader )
    : Chunk( location, zGame, dimensionId )
{
    load( zReader );
}

Chunk::~Chunk()
{
    for( int i = 0; i < CHUNK_SIZE * CHUNK_SIZE * WORLD_HEIGHT; i++ )
    {
        if( IS_BLOCK( blocks[ i ] ) )
            blocks[ i ]->release();
    }
    delete[] blocks;
}

Block *Chunk::zBlockNeighbor( Framework::Vec3<int> location )
{
    if( location.x >= 0 && location.x < CHUNK_SIZE && location.y >= 0 && location.y < CHUNK_SIZE && location.z >= 0 && location.z < WORLD_HEIGHT )
        return blocks[ (location.x * CHUNK_SIZE + location.y) * WORLD_HEIGHT + location.z ];
    if( location.z >= 0 && location.z < WORLD_HEIGHT )
        return zGame->zBlockAt( { location.x + this->location.x - CHUNK_SIZE / 2, location.y + this->location.y - CHUNK_SIZE / 2, location.z }, dimensionId );
    return 0;
}

void Chunk::api( Framework::StreamReader *zRequest, NetworkResponse *zResponse )
{
    // TODO: answer api messages
}

Block *Chunk::getBlockAt( Framework::Vec3<int> location ) const
{
    assert( (location.x * CHUNK_SIZE + location.y) * CHUNK_SIZE + location.z < CHUNK_SIZE *CHUNK_SIZE *WORLD_HEIGHT );
    Block *result = zBlockAt( location );
    if( result )
        return dynamic_cast<Block *>(result->getThis());
    return 0;
}

Block *Chunk::zBlockAt( Framework::Vec3<int> location ) const
{
    assert( (location.x * CHUNK_SIZE + location.y) * CHUNK_SIZE + location.z < CHUNK_SIZE *CHUNK_SIZE *WORLD_HEIGHT );
    return blocks[ (location.x * CHUNK_SIZE + location.y) * CHUNK_SIZE + location.z ];
}

void Chunk::putBlockAt( Framework::Vec3<int> location, Block *block )
{
    int index = (location.x * CHUNK_SIZE + location.y) * WORLD_HEIGHT + location.z;
    assert( index < CHUNK_SIZE *CHUNK_SIZE *WORLD_HEIGHT );
    Block *old = blocks[ index ];
    blocks[ index ] = block;
    Block *neighbor = zBlockNeighbor( location + getDirection( NORTH ) );
    if( IS_BLOCK( neighbor ) )
        neighbor->setNeighbour( SOUTH, block );
    if( IS_BLOCK( block ) )
        block->setNeighbour( NORTH, neighbor );
    neighbor = zBlockNeighbor( location + getDirection( EAST ) );
    if( IS_BLOCK( neighbor ) )
        neighbor->setNeighbour( WEST, block );
    if( IS_BLOCK( block ) )
        block->setNeighbour( EAST, neighbor );
    neighbor = zBlockNeighbor( location + getDirection( SOUTH ) );
    if( IS_BLOCK( neighbor ) )
        neighbor->setNeighbour( NORTH, block );
    if( IS_BLOCK( block ) )
        block->setNeighbour( SOUTH, neighbor );
    neighbor = zBlockNeighbor( location + getDirection( WEST ) );
    if( IS_BLOCK( neighbor ) )
        neighbor->setNeighbour( EAST, block );
    if( IS_BLOCK( block ) )
        block->setNeighbour( WEST, neighbor );
    neighbor = zBlockNeighbor( location + getDirection( TOP ) );
    if( IS_BLOCK( neighbor ) )
        neighbor->setNeighbour( BOTTOM, block );
    if( IS_BLOCK( block ) )
        block->setNeighbour( TOP, neighbor );
    neighbor = zBlockNeighbor( location + getDirection( BOTTOM ) );
    if( IS_BLOCK( neighbor ) )
        neighbor->setNeighbour( TOP, block );
    if( IS_BLOCK( block ) )
        block->setNeighbour( BOTTOM, neighbor );
    if( IS_BLOCK( old ) )
        old->release();
}

void Chunk::setNeighbor( Direction dir, Chunk *zChunk )
{
    zNeighbours[ getDirectionIndex(dir) ] = zChunk;
    for( int i = 0; i < CHUNK_SIZE; i++ )
    {
        for( int z = 0; z < WORLD_HEIGHT; z++ )
        {
            if( dir == NORTH )
            {
                int index = i * CHUNK_SIZE * WORLD_HEIGHT + z;
                if( IS_BLOCK( blocks[ index ] ) )
                    blocks[ index ]->setNeighbour( NORTH, zChunk->blocks[ (i * CHUNK_SIZE + CHUNK_SIZE - 1) * WORLD_HEIGHT + z ] );
            }
            else if( dir == EAST )
            {
                int index = ((CHUNK_SIZE - 1) * CHUNK_SIZE + i) * WORLD_HEIGHT + z;
                if( IS_BLOCK( blocks[ index ] ) )
                    blocks[ index ]->setNeighbour( EAST, zChunk->blocks[ i * WORLD_HEIGHT + z ] );
            }
            else if( dir == SOUTH )
            {
                int index = (i * CHUNK_SIZE + CHUNK_SIZE - 1) * WORLD_HEIGHT + z;
                if( IS_BLOCK( blocks[ index ] ) )
                    blocks[ index ]->setNeighbour( SOUTH, zChunk->blocks[ i * CHUNK_SIZE * WORLD_HEIGHT + z ] );
            }
            else if( dir == WEST )
            {
                int index = i * WORLD_HEIGHT + z;
                if( IS_BLOCK( blocks[ index ] ) )
                    blocks[ index ]->setNeighbour( WEST, zChunk->blocks[ ((CHUNK_SIZE - 1) * CHUNK_SIZE + i) * WORLD_HEIGHT + z ] );
            }
        }
    }
}

void Chunk::load( Framework::StreamReader *zReader )
{
    for( int x = 0; x < CHUNK_SIZE; x++ )
    {
        for( int y = 0; y < CHUNK_SIZE; y++ )
        {
            for( int z = 0; z < WORLD_HEIGHT; z++ )
            {
                int blockType;
                zReader->lese( (char *)&blockType, 4 );
                if( blockType >= 0 )
                {
                    Block *block = StaticRegistry<BlockType>::INSTANCE.zElement( blockType )->loadBlock( Framework::Vec3<int>( x, y, z ), zGame, zReader );
                    putBlockAt( { x, y, z }, block );
                }
            }
        }
    }
}

void Chunk::save( Framework::StreamWriter *zWriter )
{
    for( int x = 0; x < CHUNK_SIZE; x++ )
    {
        for( int y = 0; y < CHUNK_SIZE; y++ )
        {
            for( int z = 0; z < WORLD_HEIGHT; z++ )
            {
                int index = (x * CHUNK_SIZE + y) * WORLD_HEIGHT + z;
                int blockType = IS_BLOCK(blocks[ index ]) ? blocks[ index ]->zBlockType()->getId() : -1;
                zWriter->schreibe( (char *)&blockType, 4 );
                if( blockType >= 0 )
                    StaticRegistry<BlockType>::INSTANCE.zElement( blockType )->saveBlock( blocks[ index ], zWriter );
            }
        }
    }
}

void Chunk::removeUnusedBlocks()
{
    bool removed = true;
    while( removed )
    {
        removed = false;
        for( int i = 0; i < CHUNK_SIZE * CHUNK_SIZE * WORLD_HEIGHT; i++ )
        {
            if( IS_BLOCK( blocks[ i ] ) && !blocks[ i ]->isVisible() )
            {
                int x = (i / WORLD_HEIGHT) / CHUNK_SIZE;
                int y = (i / WORLD_HEIGHT) % CHUNK_SIZE;
                int z = i % WORLD_HEIGHT;
                putBlockAt( { x,y,z }, 0 );
                removed = true;
            }
        }
    }
}

int Chunk::getDimensionId() const
{
    return dimensionId;
}

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 };
}

Game *Chunk::zGameObj() const
{
    return zGame;
}