ItemLilypad.h

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#pragma once

#include "ItemHandler.h"
#include "../Entities/Player.h"
#include "../LineBlockTracer.h"





class cItemLilypadHandler :
    public cItemHandler
{
    typedef cItemHandler super;

public:
    cItemLilypadHandler(int a_ItemType):
        super(a_ItemType)
    {

    }


    virtual bool IsPlaceable(void) override
    {
        return false;  // Set as not placeable so OnItemUse is called
    }



    virtual bool OnItemUse(
        cWorld * a_World, cPlayer * a_Player, cBlockPluginInterface & a_PluginInterface, const cItem & a_Item,
        int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_BlockFace
    ) override
    {
        if (a_BlockFace > BLOCK_FACE_NONE)
        {
            // Clicked on the side of a submerged block; vanilla allows placement, so should we
            AddFaceDirection(a_BlockX, a_BlockY, a_BlockZ, a_BlockFace);
            a_World->SetBlock(a_BlockX, a_BlockY, a_BlockZ, E_BLOCK_LILY_PAD, 0);
            if (!a_Player->IsGameModeCreative())
            {
                a_Player->GetInventory().RemoveOneEquippedItem();
            }
            return true;
        }

        class cCallbacks :
            public cBlockTracer::cCallbacks
        {
        public:

            cCallbacks(void) :
                m_HasHitFluid(false)
            {
            }

            virtual bool OnNextBlock(int a_CBBlockX, int a_CBBlockY, int a_CBBlockZ, BLOCKTYPE a_CBBlockType, NIBBLETYPE a_CBBlockMeta, eBlockFace a_CBEntryFace) override
            {
                if (IsBlockWater(a_CBBlockType))
                {
                    if ((a_CBBlockMeta != 0) || (a_CBEntryFace == BLOCK_FACE_NONE))  // The hit block should be a source. The FACE_NONE check is clicking whilst submerged
                    {
                        return false;
                    }
                    AddFaceDirection(a_CBBlockX, a_CBBlockY, a_CBBlockZ, BLOCK_FACE_YP);  // Always place pad at top of water block
                    if (
                        !IsBlockWater(a_CBBlockType) &&
                        cBlockInfo::FullyOccupiesVoxel(a_CBBlockType)
                        )
                    {
                        // Can't place lilypad on air / in another block!
                        return true;
                    }
                    m_HasHitFluid = true;
                    m_Pos.Set(a_CBBlockX, a_CBBlockY, a_CBBlockZ);
                    return true;
                }
                return false;
            }

            Vector3i m_Pos;
            bool m_HasHitFluid;

        };

        cCallbacks Callbacks;
        cLineBlockTracer Tracer(*a_Player->GetWorld(), Callbacks);
        Vector3d Start(a_Player->GetEyePosition() + a_Player->GetLookVector());
        Vector3d End(a_Player->GetEyePosition() + a_Player->GetLookVector() * 5);

        Tracer.Trace(Start.x, Start.y, Start.z, End.x, End.y, End.z);

        if (Callbacks.m_HasHitFluid)
        {
            a_World->SetBlock(Callbacks.m_Pos.x, Callbacks.m_Pos.y, Callbacks.m_Pos.z, E_BLOCK_LILY_PAD, 0);
            if (!a_Player->IsGameModeCreative())
            {
                a_Player->GetInventory().RemoveOneEquippedItem();
            }
            return true;
        }

        return false;
    }
};