Enderman.cpp

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#include "Globals.h"  // NOTE: MSVC stupidness requires this to be the same across all modules

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




// cPlayerLookCheck
class cPlayerLookCheck
{
public:
    cPlayerLookCheck(Vector3d a_EndermanPos, int a_SightDistance) :
        m_Player(nullptr),
        m_EndermanPos(a_EndermanPos),
        m_SightDistance(a_SightDistance)
    {
    }

    bool operator () (cPlayer & a_Player)
    {
        // Don't check players who cannot be targeted
        if (!a_Player.CanMobsTarget())
        {
            return false;
        }

        // Don't check players who are more than SightDistance (64) blocks away
        auto Direction = m_EndermanPos - a_Player.GetPosition();
        if (Direction.Length() > m_SightDistance)
        {
            return false;
        }

        // Don't check if the player has a pumpkin on his head
        if (a_Player.GetEquippedHelmet().m_ItemType == E_BLOCK_PUMPKIN)
        {
            return false;
        }

        // If the player's crosshair is within 5 degrees of the enderman, it counts as looking
        auto LookVector = a_Player.GetLookVector();
        auto dot = Direction.Dot(LookVector);
        if (dot <= cos(0.09))  // 0.09 rad ~ 5 degrees
        {
            return false;
        }

        // TODO: Check if endermen are angered through water in Vanilla
        if (!cLineBlockTracer::LineOfSightTrace(*a_Player.GetWorld(), m_EndermanPos, a_Player.GetPosition(), cLineBlockTracer::losAirWater))
        {
            // No direct line of sight
            return false;
        }

        m_Player = &a_Player;
        return true;
    }

    cPlayer * GetPlayer(void) const { return m_Player; }

protected:
    cPlayer * m_Player;
    Vector3d m_EndermanPos;
    int m_SightDistance;
} ;





cEnderman::cEnderman(void) :
    super("Enderman", mtEnderman, "entity.endermen.hurt", "entity.endermen.death", 0.5, 2.9),
    m_bIsScreaming(false),
    m_CarriedBlock(E_BLOCK_AIR),
    m_CarriedMeta(0)
{
}





void cEnderman::GetDrops(cItems & a_Drops, cEntity * a_Killer)
{
    unsigned int LootingLevel = 0;
    if (a_Killer != nullptr)
    {
        LootingLevel = a_Killer->GetEquippedWeapon().m_Enchantments.GetLevel(cEnchantments::enchLooting);
    }
    AddRandomDropItem(a_Drops, 0, 1 + LootingLevel, E_ITEM_ENDER_PEARL);
}





void cEnderman::CheckEventSeePlayer(cChunk & a_Chunk)
{
    if (GetTarget() != nullptr)
    {
        return;
    }

    cPlayerLookCheck Callback(GetPosition(), m_SightDistance);
    if (m_World->ForEachPlayer(Callback))
    {
        return;
    }

    ASSERT(Callback.GetPlayer() != nullptr);

    if (!CheckLight())
    {
        // Insufficient light for enderman to become aggravated
        // TODO: Teleport to a suitable location
        return;
    }

    if (!Callback.GetPlayer()->CanMobsTarget())
    {
        return;
    }

    // Target the player
    cMonster::EventSeePlayer(Callback.GetPlayer(), a_Chunk);
    m_EMState = CHASING;
    m_bIsScreaming = true;
    GetWorld()->BroadcastEntityMetadata(*this);
}





void cEnderman::CheckEventLostPlayer(void)
{
    super::CheckEventLostPlayer();
    if (!CheckLight())
    {
        EventLosePlayer();
    }
}





void cEnderman::EventLosePlayer()
{
    super::EventLosePlayer();
    m_bIsScreaming = false;
    GetWorld()->BroadcastEntityMetadata(*this);
}





bool cEnderman::CheckLight()
{
    int ChunkX, ChunkZ;
    cChunkDef::BlockToChunk(POSX_TOINT, POSZ_TOINT, ChunkX, ChunkZ);

    // Check if the chunk the enderman is in is lit
    if (!m_World->IsChunkLighted(ChunkX, ChunkZ))
    {
        m_World->QueueLightChunk(ChunkX, ChunkZ);
        return true;
    }

    // Enderman only attack if the skylight is lower or equal to 8
    if (m_World->GetBlockSkyLight(POSX_TOINT, POSY_TOINT, POSZ_TOINT) - GetWorld()->GetSkyDarkness() > 8)
    {
        return false;
    }

    return true;
}





void cEnderman::Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk)
{
    super::Tick(a_Dt, a_Chunk);
    if (!IsTicking())
    {
        // The base class tick destroyed us
        return;
    }

    // Take damage when wet, drowning damage seems to be most appropriate
    if (
        cChunkDef::IsValidHeight(POSY_TOINT) &&
        (GetWorld()->IsWeatherWetAtXYZ(GetPosition().Floor()) || IsInWater())
    )
    {
        EventLosePlayer();
        TakeDamage(dtDrowning, nullptr, 1, 0);
        // TODO teleport to a safe location
    }
}