#include "Entity.h"

#include <Mat4.h>
#include <Text.h>

#include "BlockType.h"
#include "Dimension.h"
#include "EntityType.h"
#include "Game.h"
#include "ItemSkill.h"
#include "ItemStack.h"
#include "ItemType.h"

ActionTarget::ActionTarget(Framework::Vec3<int> blockPos, Direction blockSide)
    : blockPos(blockPos),
      targetBlockSide(blockSide),
      entityId(-1)
{}

ActionTarget::ActionTarget(int entityId)
    : entityId(entityId)
{}

bool ActionTarget::isBlock(
    Framework::Vec3<int> blockPos, Direction blockSide) const
{
    return this->entityId == -1 && this->blockPos == blockPos
        && (this->targetBlockSide == targetBlockSide
            || blockSide == NO_DIRECTION);
}

bool ActionTarget::isEntity(int entityId) const
{
    return this->entityId == entityId;
}

bool ActionTarget::useItemSkillOnTarget(
    Entity* zActor, ItemSkill* zItemSkill, Item* zUsedItem)
{
    if (entityId >= 0)
    {
        Entity* target = Game::INSTANCE->zEntity(entityId);
        if (target)
        {
            return zItemSkill->use(zActor, zUsedItem, target);
        }
    }
    else
    {
        Block* block = Game::INSTANCE->zRealBlockInstance(
            blockPos, zActor->getDimensionId());
        if (block)
        {
            return zItemSkill->use(zActor, zUsedItem, block);
        }
    }
    return 0;
}

bool ActionTarget::interactItemSkillOnTarget(
    Entity* zActor, ItemSkill* zItemSkill, Item* zUsedItem)
{
    if (zItemSkill)
    {
        if (entityId >= 0)
        {
            Entity* target = Game::INSTANCE->zEntity(entityId);
            if (target) return zItemSkill->interact(zActor, zUsedItem, target);
        }
        else
        {
            Block* block = Game::INSTANCE->zRealBlockInstance(
                blockPos, zActor->getDimensionId());
            if (block) return zItemSkill->interact(zActor, zUsedItem, block);
        }
    }
    else
    {
        bool itemChanged = 0;
        if (entityId >= 0)
        {
            Block* block = Game::INSTANCE->zRealBlockInstance(
                blockPos, zActor->getDimensionId());
            if (block) block->interact(zUsedItem, zActor, itemChanged);
        }
        else
        {
            Block* block = Game::INSTANCE->zRealBlockInstance(
                blockPos, zActor->getDimensionId());
            if (block) block->interact(zUsedItem, zActor, itemChanged);
        }
        return itemChanged;
    }
    return 0;
}

bool ActionTarget::placeBlock(Entity* zActor, Item* zItem)
{
    if (zActor->getStamina() > 0.2f)
    {
        if (zItem->canBePlacedAt(zActor->getDimensionId(),
                blockPos + getDirection(targetBlockSide)))
        {
            Block* block = zItem->zPlacedBlockType()->createBlockAt(
                blockPos + getDirection(targetBlockSide),
                zActor->getDimensionId(),
                zItem);
            if (block)
            {
                Game::INSTANCE->zDimension(zActor->getDimensionId())
                    ->placeBlock(block->getPos(), block);
                zItem->onPlaced();
                zActor->setStamina(zActor->getStamina() - 0.2f);
                return 1;
            }
        }
    }
    return 0;
}

void ActionTarget::toMessage(
    const ActionTarget* zTarget, int dimensionId, NetworkMessage* zMsg)
{
    if (zTarget)
    {
        if (zTarget->entityId >= 0)
        {
            Entity* zEntity = Game::INSTANCE->zEntity(zTarget->entityId);
            if (zEntity)
            {
                Framework::XML::Element* targetUIML = zEntity->getTargetUIML();
                Framework::Text targetUIMLText
                    = targetUIML ? targetUIML->toString() : Framework::Text();
                targetUIML->release();
                char* message = new char[8 + targetUIMLText.getLength()];
                message[0] = 3;
                message[1] = 1;
                *(int*)(message + 2) = zTarget->entityId;
                *(short*)(message + 6) = (short)targetUIMLText.getLength();
                memcpy(message + 8,
                    targetUIMLText.getText(),
                    targetUIMLText.getLength());
                zMsg->setMessage(message, 8 + targetUIMLText.getLength());
            }
            else
            {
                char* message = new char[2];
                message[0] = 3;
                message[1] = 0;
                zMsg->setMessage(message, 2);
            }
        }
        else
        {
            Framework::XML::Element* targetUIML = 0;
            auto block
                = Game::INSTANCE->zBlockAt(zTarget->blockPos, dimensionId, 0);
            if (block.isA())
            {
                targetUIML = block.getA()->getTargetUIML();
            }
            else if (block.isB())
            {
                targetUIML
                    = Game::INSTANCE->zBlockType(block.getB())->getTargetUIML();
            }
            Framework::Text targetUIMLText
                = targetUIML ? targetUIML->toString() : Framework::Text();
            char* message = new char[18 + targetUIMLText.getLength() + 2];
            message[0] = 3;
            message[1] = 2;
            *(int*)(message + 2) = zTarget->blockPos.x;
            *(int*)(message + 6) = zTarget->blockPos.y;
            *(int*)(message + 10) = zTarget->blockPos.z;
            *(int*)(message + 14) = zTarget->targetBlockSide;
            short len = (short)targetUIMLText.getLength();
            *(short*)(message + 18) = len;
            memcpy(message + 20, targetUIMLText.getText(), len);
            zMsg->setMessage(message, 18 + len + 2);
        }
    }
    else
    {
        char* message = new char[2];
        message[0] = 3;
        message[1] = 0;
        zMsg->setMessage(message, 2);
    }
}

void ActionTarget::save(ActionTarget* zTarget, Framework::StreamWriter* zWriter)
{
    if (zTarget)
    {
        if (zTarget->entityId >= 0)
        {
            char b = 1;
            zWriter->schreibe(&b, 1);
            zWriter->schreibe((char*)&zTarget->entityId, 4);
        }
        else
        {
            char b = 2;
            zWriter->schreibe(&b, 1);
            zWriter->schreibe((char*)&zTarget->blockPos.x, 4);
            zWriter->schreibe((char*)&zTarget->blockPos.y, 4);
            zWriter->schreibe((char*)&zTarget->blockPos.z, 4);
            zWriter->schreibe((char*)&zTarget->targetBlockSide, 4);
        }
    }
    else
    {
        char b = 0;
        zWriter->schreibe(&b, 1);
    }
}

ActionTarget* ActionTarget::load(Framework::StreamReader* zReader)
{
    char b;
    zReader->lese(&b, 1);
    if (b == 1)
    {
        int id;
        zReader->lese((char*)&id, 4);
        return new ActionTarget(id);
    }
    else if (b == 2)
    {
        Framework::Vec3<int> pos;
        Direction side;
        zReader->lese((char*)&pos.x, 4);
        zReader->lese((char*)&pos.y, 4);
        zReader->lese((char*)&pos.z, 4);
        zReader->lese((char*)&side, 4);
        return new ActionTarget(pos, side);
    }
    return 0;
}

Entity::Entity(
    int typeId, Framework::Vec3<float> location, int dimensionId, int entityId)
    : Inventory(location, dimensionId, true),
      chatSecurityLevel(0),
      lastChunkCenter(0, 0),
      lastSavedChunkCenter(Framework::Maybe<Framework::Punkt>::empty()),
      lastDimensionId(-1),
      maxMovementSpeed(0.f),
      speed(0, 0, 0),
      faceDir(1, 0, 0),
      target(0),
      typeId(typeId),
      removed(0),
      gravityMultiplier(1.f),
      jumpSpeed(0.f),
      id(entityId),
      placeBlockCooldown(0.0),
      movementFlags(0),
      collisionMap(0),
      collisionMapLength(0)
{}

void Entity::onDeath(Entity* zActor, Item* zUsedItem, ItemSkill* zUsedSkill)
{
    if (!removed)
    {
        for (DropConfig* config : zType()->getDropConfigs())
        {
            config->onObjectDestroyed(zActor, zUsedItem, zUsedSkill, this);
        }
        Dimension* dim = Game::INSTANCE->zDimension(dimensionId);
        if (dim)
        {
            Chunk* chunk = dim->zChunk(lastChunkCenter);
            if (chunk)
            {
                chunk->onEntityLeaves(this, 0);
            }
            dim->removeEntity(id);
        }
        removed = 1;
    }
}

bool Entity::useItem(int typeId, ItemStack* zStack, bool left)
{
    if (left)
    {
        if (!zStack || !zStack->zItem() || zStack->zItem()->isUsable())
        {
            cs.lock();
            if (target)
            {
                ItemSkill* selected = zSkill(typeId);
                if (!selected)
                {
                    selected = Game::INSTANCE->zItemType(typeId)
                                   ->createDefaultItemSkill();
                    selected->setItemTypeId(typeId);
                    if (selected) skills.add(selected);
                }
                if (!selected)
                {
                    selected = zSkill(ItemTypeEnum::PLAYER_HAND);
                    selected->setItemTypeId(ItemTypeEnum::PLAYER_HAND);
                }
                bool result = target->useItemSkillOnTarget(this,
                    selected,
                    !zStack || zStack->getSize() > 1 ? 0
                                                     : (Item*)zStack->zItem());
                cs.unlock();
                return result;
            }
            cs.unlock();
        }
        else
        {
            useItem(ItemTypeEnum::PLAYER_HAND, 0, left);
        }
    }
    else
    {
        if (zStack && zStack->zItem() && zStack->zItem()->isPlaceable()
            && zStack->getSize() > 0)
        { // place item
            cs.lock();
            if (target)
            {
                if (placeBlockCooldown <= 0)
                {
                    Item* item = zStack->extractFromStack();
                    bool result = target->placeBlock(this, item);
                    if (item->getHp() > 0)
                    {
                        if (!zStack->addToStack(
                                dynamic_cast<Item*>(item->getThis())))
                        {
                            ItemStack* newStack = new ItemStack(item, 1);
                            addItems(newStack, NO_DIRECTION, 0);
                            if (newStack->getSize())
                            {
                                Game::INSTANCE->spawnItem(
                                    location, dimensionId, newStack);
                            }
                        }
                        else
                        {
                            item->release();
                        }
                    }
                    else
                    {
                        item->release();
                    }
                    if (result)
                    {
                        placeBlockCooldown = 1.0;
                    }
                    cs.unlock();
                    return result;
                }
                else
                {
                    cs.unlock();
                    return 0;
                }
            }
            cs.unlock();
        }
        if (zStack && zStack->zItem() && zStack->zItem()->isEatable()
            && zStack->getSize() > 0)
        { // eat item
            if (zStack->getSize() == 1)
            {
                return ((Item*)zStack->zItem())->applyFoodEffects(this);
            }
            else
            {
                if (zStack->zItem()->canApplyFoodEffectsFully(this))
                {
                    Item* item = zStack->extractFromStack();
                    item->applyFoodEffects(this);
                    item->release();
                    return 1;
                }
            }
        }
        if (!zStack || !zStack->zItem() || zStack->zItem()->isUsable())
        {
            cs.lock();
            if (target)
            {
                ItemSkill* selected = zSkill(typeId);
                if (!selected)
                {
                    selected = Game::INSTANCE->zItemType(typeId)
                                   ->createDefaultItemSkill();
                    selected->setItemTypeId(typeId);
                    if (selected) skills.add(selected);
                }
                if (!selected)
                {
                    selected = zSkill(ItemTypeEnum::PLAYER_HAND);
                    selected->setItemTypeId(ItemTypeEnum::PLAYER_HAND);
                }
                bool result = target->interactItemSkillOnTarget(this,
                    selected,
                    !zStack || zStack->getSize() > 1 ? 0
                                                     : (Item*)zStack->zItem());
                cs.unlock();
                return result;
            }
            cs.unlock();
        }
        else
        {
            useItem(ItemTypeEnum::PLAYER_HAND, 0, left);
        }
    }
    return 0;
}

void Entity::onTargetChange() {}

bool Entity::interact(Item* zItem, Entity* zActor)
{
    return false;
}

void Entity::calculateTarget(const Item* zItem)
{
    Framework::Vec3<float> headPosition = location + faceOffset;
    int px = (int)floor(headPosition.x);
    int py = (int)floor(headPosition.y);
    int pz = (int)floor(headPosition.z);
    Framework::Vec3<float> direction = faceDir;
    direction.normalize();
    Direction dir = BOTTOM;
    bool found = false;
    bool changed = false;
    while (true)
    {
        if (getDefaultBlock(
                Game::INSTANCE->zBlockAt(
                    Framework::Vec3<int>{px, py, pz}, dimensionId, 0))
                ->isInteractable(zItem))
        {
            found = true;
            if (!target || !target->isBlock({px, py, pz}, dir))
            {
                changed = true;
            }
            break;
        }
        // collision to neighbor of current block
        if (direction.x > 0)
        {
            float xt = ((float)px + 1.f - headPosition.x) / direction.x;
            Framework::Vec3<float> tmp = headPosition + direction * xt;
            if (xt <= targetDistanceLimit && tmp.y >= (float)py
                && tmp.y < (float)py + 1.f && tmp.z >= (float)pz
                && tmp.z < (float)pz + 1.f)
            {
                dir = WEST;
                px++;
                continue;
            }
        }
        if (direction.x < 0)
        {
            float xt = ((float)px - headPosition.x) / direction.x;
            Framework::Vec3<float> tmp = headPosition + direction * xt;
            if (xt <= targetDistanceLimit && tmp.y >= (float)py
                && tmp.y < (float)py + 1.f && tmp.z >= (float)pz
                && tmp.z < (float)pz + 1.f)
            {
                dir = EAST;
                px--;
                continue;
            }
        }
        if (direction.y > 0)
        {
            float yt = ((float)py + 1.f - headPosition.y) / direction.y;
            Framework::Vec3<float> tmp = headPosition + direction * yt;
            if (yt <= targetDistanceLimit && tmp.x >= (float)px
                && tmp.x < (float)px + 1.f && tmp.z >= (float)pz
                && tmp.z < (float)pz + 1.f)
            {
                dir = NORTH;
                py++;
                continue;
            }
        }
        if (direction.y < 0)
        {
            float yt = ((float)py - headPosition.y) / direction.y;
            Framework::Vec3<float> tmp = headPosition + direction * yt;
            if (yt <= targetDistanceLimit && tmp.x >= (float)px
                && tmp.x < (float)px + 1.f && tmp.z >= (float)pz
                && tmp.z < (float)pz + 1.f)
            {
                dir = SOUTH;
                py--;
                continue;
            }
        }
        if (direction.z > 0)
        {
            float zt = ((float)pz + 1.f - headPosition.z) / direction.z;
            Framework::Vec3<float> tmp = headPosition + direction * zt;
            if (zt <= targetDistanceLimit && tmp.x >= (float)px
                && tmp.x < (float)px + 1.f && tmp.y >= (float)py
                && tmp.y < (float)py + 1.f)
            {
                dir = BOTTOM;
                pz++;
                continue;
            }
        }
        if (direction.z < 0)
        {
            float zt = ((float)pz - headPosition.z) / direction.z;
            Framework::Vec3<float> tmp = headPosition + direction * zt;
            if (zt <= targetDistanceLimit && tmp.x >= (float)px
                && tmp.x < (float)px + 1.f && tmp.y >= (float)py
                && tmp.y < (float)py + 1)
            {
                dir = TOP;
                pz--;
                continue;
            }
        }
        if (target)
        {
            changed = true;
        }
        break;
    }
    float distSq = Framework::Vec3<float>((float)px, (float)py, (float)pz)
                       .abstandSq(headPosition);
    Entity* zte = Game::INSTANCE->zDimension(dimensionId)
                      ->zTarget(headPosition, direction, distSq);
    if (zte)
    {
        if (!target || !target->isEntity(zte->getId()))
        {
            cs.lock();
            delete target;
            target = new ActionTarget(zte->getId());
            cs.unlock();
            onTargetChange();
        }
    }
    else if (changed)
    {
        if (target && !found)
        {
            cs.lock();
            delete target;
            target = 0;
            cs.unlock();
            onTargetChange();
        }
        else
        {
            cs.lock();
            delete target;
            target = new ActionTarget({px, py, pz}, dir);
            cs.unlock();
            onTargetChange();
        }
    }
}

void Entity::notifyStatusBarObservers(NetworkMessage* msg)
{
    statusBarObservable.notifyObservers(msg);
}

ItemSkill* Entity::zSkill(int itemType)
{
    for (ItemSkill* skill : skills)
    {
        if (skill->getItemTypeId() == itemType)
        {
            return skill;
        }
    }
    return 0;
}

void Entity::calcBlockCollision(int& x, int& y, int& xl, int& yl)
{
    Framework::Vec3<float> minXY = -boundingBox;
    Framework::Vec3<float> maxXY = boundingBox;
    Framework::Vec3<float> minXmaxY(minXY.x, maxXY.y, minXY.z);
    Framework::Vec3<float> maxXminY(maxXY.x, minXY.y, minXY.z);
    maxXY.z = minXY.z;
    minXY.rotateZ(rotation);
    maxXY.rotateZ(rotation);
    minXmaxY.rotateZ(rotation);
    maxXminY.rotateZ(rotation);
    minXY += location;
    maxXY += location;
    minXmaxY += location;
    maxXminY += location;
    x = (int)minXY.x;
    y = (int)minXY.y;
    if (x > (int)minXmaxY.x) x = (int)minXmaxY.x;
    if (x > (int)maxXminY.x) x = (int)maxXminY.x;
    if (x > (int)maxXY.x) x = (int)maxXY.x;
    if (y > (int)minXmaxY.y) y = (int)minXmaxY.y;
    if (y > (int)maxXminY.y) y = (int)maxXminY.y;
    if (y > (int)maxXY.y) y = (int)maxXY.y;
    xl = (int)minXY.x;
    if (xl < (int)minXmaxY.x) xl = (int)minXmaxY.x;
    if (xl < (int)maxXminY.x) xl = (int)maxXminY.x;
    if (xl < (int)maxXY.x) xl = (int)maxXY.x;
    yl = (int)minXY.y;
    if (yl < (int)minXmaxY.y) yl = (int)minXmaxY.y;
    if (yl < (int)maxXminY.y) yl = (int)maxXminY.y;
    if (yl < (int)maxXY.y) yl = (int)maxXY.y;
    xl = xl - x + 1;
    yl = yl - y + 1;
    if (collisionMapLength < xl * yl)
    {
        delete[] collisionMap;
        collisionMap = new bool[xl, yl];
        collisionMapLength = xl * yl;
    }
    memset(collisionMap, 0, xl * yl * sizeof(bool));
    int xi = (int)minXY.x - x;
    int yi = (int)minXY.y - y;
    collisionMap[xi + yi * xl] = 1;
    xi = (int)maxXY.x - x;
    yi = (int)maxXY.y - y;
    collisionMap[xi + yi * xl] = 1;
    xi = (int)minXmaxY.x - x;
    yi = (int)minXmaxY.y - y;
    collisionMap[xi + yi * xl] = 1;
    xi = (int)maxXminY.x - x;
    yi = (int)maxXminY.y - y;
    collisionMap[xi + yi * xl] = 1;
    auto dir = minXmaxY - minXY;
    float m = 0;
    if (abs(dir.x) >= abs(dir.y))
    {
        if (dir.x != 0 && dir.y != 0)
        {
            m = dir.y / dir.x;
        }
        float yy = minXY.y;
        for (int xx = (int)minXY.x; xx < (int)minXmaxY.x; xx++)
        {
            int xi = xx - x;
            int yi = (int)yy - y;
            collisionMap[xi + yi * xl] = 1;
            yy += m;
        }
    }
    else
    {
        if (dir.x != 0 && dir.y != 0)
        {
            m = dir.x / dir.y;
        }
        float xx = minXY.x;
        for (int yy = (int)minXY.y; yy < (int)minXmaxY.y; yy++)
        {
            int xi = (int)xx - x;
            int yi = yy - y;
            collisionMap[xi + yi * xl] = 1;
            xx += m;
        }
    }
    dir = maxXminY - minXY;
    m = 0;
    if (abs(dir.x) >= abs(dir.y))
    {
        if (dir.x != 0 && dir.y != 0)
        {
            m = dir.y / dir.x;
        }
        float yy = minXY.y;
        for (int xx = (int)minXY.x; xx < (int)maxXminY.x; xx++)
        {
            int xi = xx - x;
            int yi = (int)yy - y;
            collisionMap[xi + yi * xl] = 1;
            yy += m;
        }
    }
    else
    {
        if (dir.x != 0 && dir.y != 0)
        {
            m = dir.x / dir.y;
        }
        float xx = minXY.x;
        for (int yy = (int)minXY.y; yy < (int)maxXminY.y; yy++)
        {
            int xi = (int)xx - x;
            int yi = yy - y;
            collisionMap[xi + yi * xl] = 1;
            xx += m;
        }
    }
    dir = maxXY - maxXminY;
    m = 0;
    if (abs(dir.x) >= abs(dir.y))
    {
        if (dir.x != 0 && dir.y != 0)
        {
            m = dir.y / dir.x;
        }
        float yy = maxXminY.y;
        for (int xx = (int)maxXminY.x; xx < (int)maxXY.x; xx++)
        {
            int xi = xx - x;
            int yi = (int)yy - y;
            collisionMap[xi + yi * xl] = 1;
            yy += m;
        }
    }
    else
    {
        if (dir.x != 0 && dir.y != 0)
        {
            m = dir.x / dir.y;
        }
        float xx = maxXminY.x;
        for (int yy = (int)maxXminY.y; yy < (int)maxXY.y; yy++)
        {
            int xi = (int)xx - x;
            int yi = yy - y;
            collisionMap[xi + yi * xl] = 1;
            xx += m;
        }
    }
    dir = maxXY - minXmaxY;
    m = 0;
    if (abs(dir.x) >= abs(dir.y))
    {
        if (dir.x != 0 && dir.y != 0)
        {
            m = dir.y / dir.x;
        }
        float yy = minXmaxY.y;
        for (int xx = (int)minXmaxY.x; xx < (int)maxXY.x; xx++)
        {
            int xi = xx - x;
            int yi = (int)yy - y;
            collisionMap[xi + yi * xl] = 1;
            yy += m;
        }
    }
    else
    {
        if (dir.x != 0 && dir.y != 0)
        {
            m = dir.x / dir.y;
        }
        float xx = minXmaxY.x;
        for (int yy = (int)minXmaxY.y; yy < (int)maxXY.y; yy++)
        {
            int xi = (int)xx - x;
            int yi = yy - y;
            collisionMap[xi + yi * xl] = 1;
            xx += m;
        }
    }
    for (int yy = 0; yy < yl; yy++)
    {
        int min = xl;
        int max = -1;
        for (int xx = 0; xx < xl; xx++)
        {
            if (collisionMap[xx + yy * xl])
            {
                if (xx < min) min = xx;
                if (xx > max) max = xx;
            }
        }
        for (int xx = min; xx <= max; xx++)
        {
            collisionMap[xx + yy * xl] = 1;
        }
    }
}

bool Entity::isCollidingWithBlock(const Dimension* zDimension)
{
    int x, y, xl, yl;
    calcBlockCollision(x, y, xl, yl);
    bool result = isCollidingWithBlock(zDimension, x, y, xl, yl);
    return result;
}

bool Entity::isCollidingWithBlock(
    const Dimension* zDimension, int x, int y, int xl, int yl)
{
    for (int yy = 0; yy < yl; yy++)
    {
        for (int xx = 0; xx < xl; xx++)
        {
            if (collisionMap[xx + yy * xl])
            {
                for (int zz = (int)(location.z - boundingBox.z);
                    zz <= (int)(location.z + boundingBox.z);
                    zz++)
                {
                    const Block* block = zDimension->zBlockOrDefault(
                        Framework::Vec3<int>(x + xx, y + yy, zz));
                    if (!block->isPassable())
                    {
                        return true;
                    }
                }
            }
        }
    }
    return false;
}

void Entity::prepareTick(const Dimension* zDimension, double seconds) {}

void Entity::tick(const Dimension* zDimension, double seconds)
{
    if (removed) return;
    if (placeBlockCooldown > 0)
    {
        placeBlockCooldown -= seconds;
    }
    bool changed = 0;
    float rotSpeed = 0.f;
    if (movementFlags & MovementFlags::ROTATE_LEFT)
    {
        rotSpeed += 3.f * (float)seconds;
    }
    if (movementFlags & MovementFlags::ROTATE_RIGHT)
    {
        rotSpeed -= 3.f * (float)seconds;
    }
    if (movementFlags & MovementFlags::ROTATE_TO_FACE)
    {
        float rot = Framework::Vec2<float>(0, -1).angle({faceDir.x, faceDir.y});
        rotSpeed = rot - rotation;
    }
    if (rotSpeed != 0.f)
    {
        rotation += rotSpeed;
        if (isCollidingWithBlock(zDimension))
        {
            rotation -= rotSpeed;
        }
        else
        {
            changed = 1;
        }
        while (rotation > 2.f * (float)PI)
        {
            rotation -= 2.f * (float)PI;
        }
        while (rotation < 0.f)
        {
            rotation += 2.f * (float)PI;
        }
    }
    Framework::Vec3<float> moveDir(0.f, 0.f, 0.f);
    if (movementFlags & MovementFlags::WALK_FORWARD)
    {
        moveDir.x += cosf(rotation - (float)PI / 2.f);
        moveDir.y += sinf(rotation - (float)PI / 2.f);
    }
    if (movementFlags & MovementFlags::WALK_BACKWARD)
    {
        moveDir.x -= cosf(rotation - (float)PI / 2.f);
        moveDir.y -= sinf(rotation - (float)PI / 2.f);
    }
    if (movementFlags & MovementFlags::WALK_LEFT)
    {
        moveDir.x += cosf(rotation + (float)PI);
        moveDir.y += sinf(rotation + (float)PI);
    }
    if (movementFlags & MovementFlags::WALK_RIGHT)
    {
        moveDir.x += cosf(rotation);
        moveDir.y += sinf(rotation);
    }
    if (movementFlags & MovementFlags::FLYING
        && movementFlags & MovementFlags::JUMPING)
    {
        moveDir.z += 1.f;
        movementFlags &= ~MovementFlags::GROUND_CONTACT;
    }
    if (movementFlags & MovementFlags::FLYING
        && movementFlags & MovementFlags::SNEAKING)
    {
        moveDir.z -= 1.f;
    }
    float staminaCost = 0.f;
    if (moveDir.x != 0.f || moveDir.y != 0.f)
    {
        moveDir.normalize();
        moveDir *= maxMovementSpeed * (float)seconds;
        if (movementFlags & MovementFlags::SPRINTING)
        {
            moveDir *= 2.f;
        }
        if (movementFlags & MovementFlags::SNEAKING
            && !(movementFlags & MovementFlags::FLYING))
        {
            moveDir *= 0.5f;
        }
        staminaCost = moveDir.getLength() / (maxMovementSpeed * 10);
        if (stamina < staminaCost)
        {
            staminaCost = stamina;
            moveDir *= stamina / staminaCost;
        }
    }
    if (!(movementFlags & MovementFlags::FLYING)
        && movementFlags & MovementFlags::JUMPING
        && movementFlags & MovementFlags::GROUND_CONTACT)
    {
        if (stamina > staminaCost + 0.02f)
        {
            staminaCost += 0.02f;
            speed.z += jumpSpeed;
            movementFlags &= ~MovementFlags::GROUND_CONTACT;
        }
    }
    if (!(movementFlags & MovementFlags::FLYING))
    {
        speed.z
            -= zDimension->getGravity() * gravityMultiplier * (float)seconds;
    }
    moveDir += speed * (float)seconds;
    bool staminaChanged = staminaCost != 0.f;
    stamina -= staminaCost;
    if (stamina <= maxStamina - (float)seconds)
    {
        if (getThirst() > 0 && getHunger() > 0)
        { // TODO: modify regen rate based on hunger/thirst
            stamina += (float)seconds;
            staminaChanged = 1;
            setHunger(hunger - (float)seconds / 5.f);
            setThirst(thirst - (float)seconds / 2.5f);
        }
    }
    if (staminaChanged)
    {
        setStamina(stamina); // notify observers
    }
    if (moveDir.x != 0.f || moveDir.y != 0.f || moveDir.z != 0.f)
    {
        while (abs(moveDir.x) > 1.f)
        {
            if (moveDir.x > 0.f)
            {
                location.x += 1.f;
                if (isCollidingWithBlock(zDimension))
                {
                    moveDir.x = 0.f;
                    speed.x = 0.f;
                    location.x -= 1.f;
                }
                else
                {
                    moveDir.x -= 1.f;
                    changed = 1;
                }
            }
            else
            {
                location.x -= 1.f;
                if (isCollidingWithBlock(zDimension))
                {
                    moveDir.x = 0.f;
                    speed.x = 0.f;
                    location.x += 1.f;
                }
                else
                {
                    moveDir.x += 1.f;
                    changed = 1;
                }
            }
        }
        if (moveDir.x != 0.f)
        {
            location.x += moveDir.x;
            if (isCollidingWithBlock(zDimension))
            {
                location.x -= moveDir.x;
                speed.x = 0.f;
            }
            else
            {
                changed = 1;
            }
        }
        while (abs(moveDir.y) > 1.f)
        {
            if (moveDir.y > 0.f)
            {
                location.y += 1.f;
                if (isCollidingWithBlock(zDimension))
                {
                    moveDir.y = 0.f;
                    location.y -= 1.f;
                    speed.y = 0.f;
                }
                else
                {
                    moveDir.y -= 1.f;
                    changed = 1;
                }
            }
            else
            {
                location.y -= 1.f;
                if (isCollidingWithBlock(zDimension))
                {
                    moveDir.y = 0.f;
                    location.y += 1.f;
                    speed.y = 0.f;
                }
                else
                {
                    moveDir.y += 1.f;
                    changed = 1;
                }
            }
        }
        if (moveDir.y != 0.f)
        {
            location.y += moveDir.y;
            if (isCollidingWithBlock(zDimension))
            {
                location.y -= moveDir.y;
                speed.y = 0.f;
            }
            else
            {
                changed = 1;
            }
        }
        while (abs(moveDir.z) > 1.f)
        {
            if (moveDir.z > 0.f)
            {
                location.z += 1.f;
                if (isCollidingWithBlock(zDimension))
                {
                    moveDir.z = 0.f;
                    location.z -= 1.f;
                    speed.z = 0.f;
                }
                else
                {
                    moveDir.z -= 1.f;
                    changed = 1;
                }
            }
            else
            {
                location.z -= 1.f;
                if (isCollidingWithBlock(zDimension))
                {
                    moveDir.z = 0.f;
                    location.z += 1.f;
                    onFall(speed.z);
                    speed.z = 0.f;
                    movementFlags |= MovementFlags::GROUND_CONTACT;
                }
                else
                {
                    moveDir.z += 1.f;
                    changed = 1;
                }
            }
        }
        if (moveDir.z != 0.f)
        {
            location.z += moveDir.z;
            if (isCollidingWithBlock(zDimension))
            {
                if (speed.z < 0.f)
                {
                    onFall(speed.z);
                    speed.z = 0.f;
                    movementFlags |= MovementFlags::GROUND_CONTACT;
                }
                else
                {
                    changed = 1;
                }
                location.z -= moveDir.z;
            }
        }
    }
    if (movementFlags & MovementFlags::GROUND_CONTACT)
    {
        if (speed.x != 0)
        {
            if (speed.x > (float)seconds)
            {
                speed.x -= (float)seconds;
            }
            else if (speed.x < -(float)seconds)
            {
                speed.x += (float)seconds;
            }
            else
            {
                speed.x = 0;
            }
        }
        if (speed.y != 0)
        {
            if (speed.y > (float)seconds)
            {
                speed.y -= (float)seconds;
            }
            else if (speed.y < -(float)seconds)
            {
                speed.y += (float)seconds;
            }
            else
            {
                speed.y = 0;
            }
        }
    }
    Framework::Punkt chunkCenter
        = Game::INSTANCE->getChunkCenter((int)location.x, (int)location.y);
    Chunk* zCurrentChunk = 0;
    if (dimensionId != lastDimensionId || chunkCenter != lastChunkCenter)
    {
        Dimension* lastDimension = Game::INSTANCE->zDimension(lastDimensionId);
        Dimension* currentDimension = Game::INSTANCE->zDimension(dimensionId);
        zCurrentChunk
            = currentDimension ? currentDimension->zChunk(chunkCenter) : 0;
        Chunk* zLastChunk
            = lastDimension ? lastDimension->zChunk(lastChunkCenter) : 0;
        if (lastDimensionId != -1)
        {
            if (zLastChunk)
            {
                zLastChunk->onEntityLeaves(
                    this, lastDimensionId == dimensionId ? zCurrentChunk : 0);
            }
        }
        if (zCurrentChunk)
        {
            zCurrentChunk->onEntityEnters(
                this, lastDimensionId == dimensionId ? zLastChunk : 0);
        }
        lastDimensionId = dimensionId;
        lastChunkCenter = chunkCenter;
    }
    if (changed)
    {
        if (!zCurrentChunk)
        {
            Dimension* currentDimension
                = Game::INSTANCE->zDimension(dimensionId);
            zCurrentChunk
                = currentDimension ? currentDimension->zChunk(chunkCenter) : 0;
        }
        if (zCurrentChunk)
        {
            NetworkMessage* msg = new NetworkMessage();
            msg->sendEntityMovement(this, (float)seconds);
            zCurrentChunk->notifyObservers(msg);
        }
    }
}

void Entity::api(Framework::StreamReader* zRequest,
    NetworkMessage* zResponse,
    Entity* zSource)
{
    char type;
    zRequest->lese(&type, 1);
    switch (type)
    {
    case 0: // request status bar state
        {
            char len;
            zRequest->lese(&len, 1);
            char* guiId = new char[(int)len + 1];
            zRequest->lese(guiId, len);
            guiId[(int)len] = 0;
            int processor;
            zRequest->lese((char*)&processor, 4);
            zResponse->addressUIElement(guiId, processor);
            statusBarObservable.addObserver(zSource, guiId, processor);
            char* msg = new char[33];
            msg[0] = 0;
            *(float*)(msg + 1) = getMaxHP();
            *(float*)(msg + 5) = getCurrentHP();
            *(float*)(msg + 9) = getMaxStamina();
            *(float*)(msg + 13) = getStamina();
            *(float*)(msg + 17) = getMaxHunger();
            *(float*)(msg + 21) = getHunger();
            *(float*)(msg + 25) = getMaxThirst();
            *(float*)(msg + 29) = getThirst();
            zResponse->setMessage(msg, 33);
            delete[] guiId;
            break;
        }
    case 1: // remove status bar observer
        {
            char len;
            zRequest->lese(&len, 1);
            char* guiId = new char[(int)len + 1];
            zRequest->lese(guiId, len);
            guiId[(int)len] = 0;
            int processor;
            zRequest->lese((char*)&processor, 4);
            statusBarObservable.removeObserver(zSource, guiId, processor);
            delete[] guiId;
            break;
        }
    case 2: // TODO: component request
        break;
    }
}

void Entity::onFall(float collisionSpeed)
{
    if (collisionSpeed > 20)
    {
        setHP(this, 0, 0, getCurrentHP() - (collisionSpeed - 20.f) / 2.5f);
    }
}

Framework::XML::Element* Entity::getTargetUIML() const
{
    return new Framework::XML::Element(
        Framework::Text(
            "<targetInfo><text id=\"type\" width=\"auto\" height=\"auto\">")
        + Game::INSTANCE->zEntityType(typeId)->getName()
        + "</text></targetInfo>");
}

void Entity::setChatSecurityLevel(int level)
{
    chatSecurityLevel = level;
}

void Entity::setPosition(Framework::Vec3<float> pos)
{
    location = pos;
}

void Entity::takeDamage(
    Entity* zSource, Item* zUsedItem, ItemSkill* zUsedSkill, float damage)
{
    currentHP -= damage;
    if (currentHP <= 0)
    {
        currentHP = 0;
        onDeath(zSource, zUsedItem, zUsedSkill);
    }
}

void Entity::setHP(
    Entity* zActor, Item* zUsedItem, ItemSkill* zUsedSkill, float hp)
{
    currentHP = MIN(MAX(hp, 0), maxHP);
    NetworkMessage* msg = new NetworkMessage();
    char* message = new char[9];
    message[0] = 1;
    *(float*)(message + 1) = getMaxHP();
    *(float*)(message + 5) = getCurrentHP();
    msg->setMessage(message, 9);
    notifyStatusBarObservers(msg);
    if (currentHP == 0)
    {
        onDeath(zActor, zUsedItem, zUsedSkill);
    }
}

void Entity::setStamina(float stamina)
{
    this->stamina = MIN(MAX(stamina, 0), maxStamina);
    NetworkMessage* msg = new NetworkMessage();
    char* message = new char[9];
    message[0] = 2;
    *(float*)(message + 1) = getMaxStamina();
    *(float*)(message + 5) = getStamina();
    msg->setMessage(message, 9);
    notifyStatusBarObservers(msg);
}

void Entity::setHunger(float hunger)
{
    this->hunger = MIN(MAX(hunger, 0), maxHunger);
    NetworkMessage* msg = new NetworkMessage();
    char* message = new char[9];
    message[0] = 3;
    *(float*)(message + 1) = getMaxHunger();
    *(float*)(message + 5) = getHunger();
    msg->setMessage(message, 9);
    notifyStatusBarObservers(msg);
}

void Entity::setThirst(float thirst)
{
    this->thirst = MIN(MAX(thirst, 0), maxThirst);
    NetworkMessage* msg = new NetworkMessage();
    char* message = new char[9];
    message[0] = 4;
    *(float*)(message + 1) = getMaxThirst();
    *(float*)(message + 5) = getThirst();
    msg->setMessage(message, 9);
    notifyStatusBarObservers(msg);
}

void Entity::setGravityMultiplier(float multiplier)
{
    gravityMultiplier = multiplier;
}

float Entity::getMaxHP() const
{
    return maxHP;
}

float Entity::getCurrentHP() const
{
    return currentHP;
}

float Entity::getStamina() const
{
    return stamina;
}

float Entity::getMaxStamina() const
{
    return maxStamina;
}

float Entity::getHunger() const
{
    return hunger;
}

float Entity::getMaxHunger() const
{
    return maxHunger;
}

float Entity::getThirst() const
{
    return thirst;
}

float Entity::getMaxThirst() const
{
    return maxThirst;
}

Framework::Vec3<float> Entity::getSpeed() const
{
    return speed;
}

Framework::Vec3<float> Entity::getFaceDir() const
{
    return faceDir;
}

Framework::Vec3<float> Entity::getPosition() const
{
    return location;
}

float Entity::getGravityMultiplier() const
{
    return gravityMultiplier;
}

float Entity::getJumpSpeed() const
{
    return jumpSpeed;
}

void Entity::setJumpSpeed(float speed)
{
    jumpSpeed = speed;
}

bool Entity::isRemoved() const
{
    return removed;
}

const EntityType* Entity::zType() const
{
    return Game::INSTANCE->zEntityType(typeId);
}

const ActionTarget* Entity::zTarget() const
{
    return target;
}

int Entity::getId() const
{
    return id;
}

bool Entity::hasDefaultModel() const
{
    return 1;
}

ModelInfo* Entity::zSpecialModel() const
{
    return 0;
}

float Entity::getMaxSpeed() const
{
    return maxMovementSpeed;
}

bool Entity::isMoving() const
{
    return movementFlags > 0;
}

int Entity::getChatSecurityLevel() const
{
    return chatSecurityLevel;
}

Framework::Maybe<Framework::Punkt> Entity::getLastSavedChunkCenter() const
{
    return lastSavedChunkCenter;
}

void Entity::setLastSavedChunkCenter(Framework::Punkt pos)
{
    lastSavedChunkCenter = Framework::Maybe<Framework::Punkt>::of(pos);
}

void Entity::setRemoved()
{
    removed = true;
}

double Entity::getHitDistance(
    Framework::Vec3<float> rayOrigin, Framework::Vec3<float> rayDirection) const
{
    Framework::Vec3<float> rotatedRayOrigin
        = Framework::Vec3<float>(rayOrigin).rotateZ(-rotation);
    Framework::Vec3<float> rotatedRayDirection
        = Framework::Vec3<float>(rayDirection).rotateZ(-rotation);
    rotatedRayDirection.normalize();
    if (rotatedRayDirection.x != 0)
    {
        float d;
        if (rotatedRayDirection.x > 0)
        {
            float border = getPosition().x - boundingBox.x;
            d = (border - rotatedRayOrigin.x) / rotatedRayDirection.x;
        }
        else if (rotatedRayDirection.x < 0)
        {
            float border = getPosition().x + boundingBox.x;
            d = (border - rotatedRayOrigin.x) / rotatedRayDirection.x;
        }
        if (d > 0)
        {
            Framework::Vec3<float> hitPoint
                = rotatedRayOrigin + rotatedRayDirection * d;
            if (hitPoint.y >= getPosition().y - boundingBox.y
                && hitPoint.y <= getPosition().y + boundingBox.y
                && hitPoint.z >= getPosition().z - boundingBox.z
                && hitPoint.z <= getPosition().z + boundingBox.z)
            {
                return d;
            }
        }
    }
    if (rotatedRayDirection.y != 0)
    {
        float d;
        if (rotatedRayDirection.y > 0)
        {
            float border = getPosition().y - boundingBox.y;
            d = (border - rotatedRayOrigin.y) / rotatedRayDirection.y;
        }
        else if (rotatedRayDirection.y < 0)
        {
            float border = getPosition().y + boundingBox.y;
            d = (border - rotatedRayOrigin.y) / rotatedRayDirection.y;
        }
        if (d > 0)
        {
            Framework::Vec3<float> hitPoint
                = rotatedRayOrigin + rotatedRayDirection * d;
            if (hitPoint.x >= getPosition().x - boundingBox.x
                && hitPoint.x <= getPosition().x + boundingBox.x
                && hitPoint.z >= getPosition().z - boundingBox.z
                && hitPoint.z <= getPosition().z + boundingBox.z)
            {
                return d;
            }
        }
    }
    if (rotatedRayDirection.z != 0)
    {
        float d;
        if (rotatedRayDirection.z > 0)
        {
            float border = getPosition().z - boundingBox.z;
            d = (border - rotatedRayOrigin.z) / rotatedRayDirection.z;
        }
        else if (rotatedRayDirection.z < 0)
        {
            float border = getPosition().z + boundingBox.z;
            d = (border - rotatedRayOrigin.z) / rotatedRayDirection.z;
        }
        if (d > 0)
        {
            Framework::Vec3<float> hitPoint
                = rotatedRayOrigin + rotatedRayDirection * d;
            if (hitPoint.x >= getPosition().x - boundingBox.x
                && hitPoint.x <= getPosition().x + boundingBox.x
                && hitPoint.y >= getPosition().y - boundingBox.y
                && hitPoint.y <= getPosition().y + boundingBox.y)
            {
                return d;
            }
        }
    }
    return NAN;
}

float Entity::getRotation() const
{
    return rotation;
}