EntityEffect.cpp

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

#include "EntityEffect.h"
#include "Player.h"
#include "../Chunk.h"
#include "../Mobs/Monster.h"





int cEntityEffect::GetPotionColor(short a_ItemDamage)
{
    // Lowest six bits
    return (a_ItemDamage & 0x3f);
}





cEntityEffect::eType cEntityEffect::GetPotionEffectType(short a_ItemDamage)
{
    // Lowest four bits
    // Potion effect bits are different from entity effect values
    // For reference: https://minecraft.gamepedia.com/Java_Edition_data_values#.22Potion_effect.22_bits
    switch (a_ItemDamage & 0x0f)
    {
        case 0x01: return cEntityEffect::effRegeneration;
        case 0x02: return cEntityEffect::effSpeed;
        case 0x03: return cEntityEffect::effFireResistance;
        case 0x04: return cEntityEffect::effPoison;
        case 0x05: return cEntityEffect::effInstantHealth;
        case 0x06: return cEntityEffect::effNightVision;
        case 0x08: return cEntityEffect::effWeakness;
        case 0x09: return cEntityEffect::effStrength;
        case 0x0a: return cEntityEffect::effSlowness;
        case 0x0b: return cEntityEffect::effJumpBoost;
        case 0x0c: return cEntityEffect::effInstantDamage;
        case 0x0d: return cEntityEffect::effWaterBreathing;
        case 0x0e: return cEntityEffect::effInvisibility;

        // No effect potions
        case 0x00:
        case 0x07:
        case 0x0f:
        {
            break;
        }
    }
    return cEntityEffect::effNoEffect;
}





short cEntityEffect::GetPotionEffectIntensity(short a_ItemDamage)
{
    // Level II potion if the fifth lowest bit is set
    return ((a_ItemDamage & 0x20) != 0) ? 1 : 0;
}





int cEntityEffect::GetPotionEffectDuration(short a_ItemDamage)
{
    // Base duration in ticks
    int base = 0;
    double TierCoeff = 1, ExtCoeff = 1, SplashCoeff = 1;

    switch (GetPotionEffectType(a_ItemDamage))
    {
        case cEntityEffect::effRegeneration:
        case cEntityEffect::effPoison:
        {
            base = 900;
            break;
        }

        case cEntityEffect::effSpeed:
        case cEntityEffect::effFireResistance:
        case cEntityEffect::effNightVision:
        case cEntityEffect::effStrength:
        case cEntityEffect::effWaterBreathing:
        case cEntityEffect::effJumpBoost:
        case cEntityEffect::effInvisibility:
        {
            base = 3600;
            break;
        }

        case cEntityEffect::effWeakness:
        case cEntityEffect::effSlowness:
        {
            base = 1800;
            break;
        }
        default: break;
    }

    // If potion is level II, half the duration. If not, stays the same
    TierCoeff = (GetPotionEffectIntensity(a_ItemDamage) > 0) ? 0.5 : 1;

    // If potion is extended, multiply duration by 8 / 3. If not, stays the same
    // Extended potion if sixth lowest bit is set
    ExtCoeff = (a_ItemDamage & 0x40) ? (8.0 / 3.0) : 1;

    // If potion is splash potion, multiply duration by 3 / 4. If not, stays the same
    SplashCoeff = IsPotionDrinkable(a_ItemDamage) ? 1 : 0.75;

    // Ref.:
    //   https://minecraft.gamepedia.com/Java_Edition_data_values#.22Tier.22_bit
    //   https://minecraft.gamepedia.com/Java_Edition_data_values#.22Extended_duration.22_bit
    //   https://minecraft.gamepedia.com/Java_Edition_data_values#.22Splash_potion.22_bit

    return static_cast<int>(base * TierCoeff * ExtCoeff * SplashCoeff);
}





bool cEntityEffect::IsPotionDrinkable(short a_ItemDamage)
{
    // Potions are drinkable if they are not splash potions.
    // i.e. potions are drinkable if the 14th lowest bit is not set
    // Ref.: https://minecraft.gamepedia.com/Java_Edition_data_values#.22Splash_potion.22_bit
    return ((a_ItemDamage & 0x4000) == 0);
}





cEntityEffect::cEntityEffect():
    m_Ticks(0),
    m_Duration(0),
    m_Intensity(0),
    m_DistanceModifier(1)
{

}





cEntityEffect::cEntityEffect(int a_Duration, short a_Intensity, double a_DistanceModifier):
    m_Ticks(0),
    m_Duration(a_Duration),
    m_Intensity(a_Intensity),
    m_DistanceModifier(a_DistanceModifier)
{

}





cEntityEffect::cEntityEffect(const cEntityEffect & a_OtherEffect):
    m_Ticks(a_OtherEffect.m_Ticks),
    m_Duration(a_OtherEffect.m_Duration),
    m_Intensity(a_OtherEffect.m_Intensity),
    m_DistanceModifier(a_OtherEffect.m_DistanceModifier)
{

}





cEntityEffect & cEntityEffect::operator =(cEntityEffect a_OtherEffect)
{
    std::swap(m_Ticks, a_OtherEffect.m_Ticks);
    std::swap(m_Duration, a_OtherEffect.m_Duration);
    std::swap(m_Intensity, a_OtherEffect.m_Intensity);
    std::swap(m_DistanceModifier, a_OtherEffect.m_DistanceModifier);
    return *this;
}





std::unique_ptr<cEntityEffect> cEntityEffect::CreateEntityEffect(cEntityEffect::eType a_EffectType, int a_Duration, short a_Intensity, double a_DistanceModifier)
{
    switch (a_EffectType)
    {
        case cEntityEffect::effNoEffect:       return cpp14::make_unique<cEntityEffect              >(a_Duration, a_Intensity, a_DistanceModifier);

        case cEntityEffect::effAbsorption:     return cpp14::make_unique<cEntityEffectAbsorption    >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effBlindness:      return cpp14::make_unique<cEntityEffectBlindness     >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effFireResistance: return cpp14::make_unique<cEntityEffectFireResistance>(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effHaste:          return cpp14::make_unique<cEntityEffectHaste         >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effHealthBoost:    return cpp14::make_unique<cEntityEffectHealthBoost   >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effHunger:         return cpp14::make_unique<cEntityEffectHunger        >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effInstantDamage:  return cpp14::make_unique<cEntityEffectInstantDamage >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effInstantHealth:  return cpp14::make_unique<cEntityEffectInstantHealth >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effInvisibility:   return cpp14::make_unique<cEntityEffectInvisibility  >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effJumpBoost:      return cpp14::make_unique<cEntityEffectJumpBoost     >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effMiningFatigue:  return cpp14::make_unique<cEntityEffectMiningFatigue >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effNausea:         return cpp14::make_unique<cEntityEffectNausea        >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effNightVision:    return cpp14::make_unique<cEntityEffectNightVision   >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effPoison:         return cpp14::make_unique<cEntityEffectPoison        >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effRegeneration:   return cpp14::make_unique<cEntityEffectRegeneration  >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effResistance:     return cpp14::make_unique<cEntityEffectResistance    >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effSaturation:     return cpp14::make_unique<cEntityEffectSaturation    >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effSlowness:       return cpp14::make_unique<cEntityEffectSlowness      >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effSpeed:          return cpp14::make_unique<cEntityEffectSpeed         >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effStrength:       return cpp14::make_unique<cEntityEffectStrength      >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effWaterBreathing: return cpp14::make_unique<cEntityEffectWaterBreathing>(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effWeakness:       return cpp14::make_unique<cEntityEffectWeakness      >(a_Duration, a_Intensity, a_DistanceModifier);
        case cEntityEffect::effWither:         return cpp14::make_unique<cEntityEffectWither        >(a_Duration, a_Intensity, a_DistanceModifier);
    }
    UNREACHABLE("Unsupported entity effect");
}





void cEntityEffect::OnTick(cPawn & a_Target)
{
    // Reduce the effect's duration
    ++m_Ticks;
}





// cEntityEffectSpeed:

void cEntityEffectSpeed::OnActivate(cPawn & a_Target)
{
    if (a_Target.IsMob())
    {
        cMonster * Mob = static_cast<cMonster*>(&a_Target);
        Mob->SetRelativeWalkSpeed(Mob->GetRelativeWalkSpeed() + 0.2 * m_Intensity);
    }
    else if (a_Target.IsPlayer())
    {
        cPlayer * Player = static_cast<cPlayer*>(&a_Target);
        Player->SetNormalMaxSpeed(Player->GetNormalMaxSpeed() + 0.2 * m_Intensity);
        Player->SetSprintingMaxSpeed(Player->GetSprintingMaxSpeed() + 0.26 * m_Intensity);
        Player->SetFlyingMaxSpeed(Player->GetFlyingMaxSpeed() + 0.2 * m_Intensity);
    }
}





void cEntityEffectSpeed::OnDeactivate(cPawn & a_Target)
{
    if (a_Target.IsMob())
    {
        cMonster * Mob = static_cast<cMonster*>(&a_Target);
        Mob->SetRelativeWalkSpeed(Mob->GetRelativeWalkSpeed() - 0.2 * m_Intensity);
    }
    else if (a_Target.IsPlayer())
    {
        cPlayer * Player = static_cast<cPlayer*>(&a_Target);
        Player->SetNormalMaxSpeed(Player->GetNormalMaxSpeed() - 0.2 * m_Intensity);
        Player->SetSprintingMaxSpeed(Player->GetSprintingMaxSpeed() - 0.26 * m_Intensity);
        Player->SetFlyingMaxSpeed(Player->GetFlyingMaxSpeed() - 0.2 * m_Intensity);
    }
}





// cEntityEffectSlowness:

void cEntityEffectSlowness::OnActivate(cPawn & a_Target)
{
    if (a_Target.IsMob())
    {
        cMonster * Mob = static_cast<cMonster*>(&a_Target);
        Mob->SetRelativeWalkSpeed(Mob->GetRelativeWalkSpeed() - 0.15 * m_Intensity);
    }
    else if (a_Target.IsPlayer())
    {
        cPlayer * Player = static_cast<cPlayer*>(&a_Target);
        Player->SetNormalMaxSpeed(Player->GetNormalMaxSpeed() - 0.15 * m_Intensity);
        Player->SetSprintingMaxSpeed(Player->GetSprintingMaxSpeed() - 0.195 * m_Intensity);
        Player->SetFlyingMaxSpeed(Player->GetFlyingMaxSpeed() - 0.15 * m_Intensity);
    }
}





void cEntityEffectSlowness::OnDeactivate(cPawn & a_Target)
{
    if (a_Target.IsMob())
    {
        cMonster * Mob = static_cast<cMonster*>(&a_Target);
        Mob->SetRelativeWalkSpeed(Mob->GetRelativeWalkSpeed() + 0.15 * m_Intensity);
    }
    else if (a_Target.IsPlayer())
    {
        cPlayer * Player = static_cast<cPlayer*>(&a_Target);
        Player->SetNormalMaxSpeed(Player->GetNormalMaxSpeed() + 0.15 * m_Intensity);
        Player->SetSprintingMaxSpeed(Player->GetSprintingMaxSpeed() + 0.195 * m_Intensity);
        Player->SetFlyingMaxSpeed(Player->GetFlyingMaxSpeed() + 0.15 * m_Intensity);
    }
}





// cEntityEffectInstantHealth:

void cEntityEffectInstantHealth::OnActivate(cPawn & a_Target)
{
    // Base amount = 6, doubles for every increase in intensity
    int amount = static_cast<int>(6 * (1 << m_Intensity) * m_DistanceModifier);

    if (a_Target.IsMob() && static_cast<cMonster &>(a_Target).IsUndead())
    {
        a_Target.TakeDamage(dtPotionOfHarming, nullptr, amount, 0);  // TODO: Store attacker in a pointer-safe way, pass to TakeDamage
        return;
    }
    a_Target.Heal(amount);
}





// cEntityEffectInstantDamage:

void cEntityEffectInstantDamage::OnActivate(cPawn & a_Target)
{
    // Base amount = 6, doubles for every increase in intensity
    int amount = static_cast<int>(6 * (1 << m_Intensity) * m_DistanceModifier);

    if (a_Target.IsMob() && static_cast<cMonster &>(a_Target).IsUndead())
    {
        a_Target.Heal(amount);
        return;
    }
    a_Target.TakeDamage(dtPotionOfHarming, nullptr, amount, 0);  // TODO: Store attacker in a pointer-safe way, pass to TakeDamage
}





// cEntityEffectRegeneration:

void cEntityEffectRegeneration::OnTick(cPawn & a_Target)
{
    super::OnTick(a_Target);

    if (a_Target.IsMob() && static_cast<cMonster &>(a_Target).IsUndead())
    {
        return;
    }

    // Regen frequency = 50 ticks, divided by potion level (Regen II = 25 ticks)
    int frequency = FloorC(50.0 / static_cast<double>(m_Intensity + 1));

    if ((m_Ticks % frequency) != 0)
    {
        return;
    }

    a_Target.Heal(1);
}





// cEntityEffectHunger:

void cEntityEffectHunger::OnTick(cPawn & a_Target)
{
    super::OnTick(a_Target);

    if (a_Target.IsPlayer())
    {
        cPlayer & Target = static_cast<cPlayer &>(a_Target);
        Target.AddFoodExhaustion(0.025 * (static_cast<double>(GetIntensity()) + 1.0));  // 0.5 per second = 0.025 per tick
    }
}





// cEntityEffectInvisibility:

void cEntityEffectInvisibility::BroadcastMetadata(cPawn & a_Target)
{
    auto World = a_Target.GetWorld();
    if (World != nullptr)
    {
        World->BroadcastEntityMetadata(a_Target);
    }
}





// cEntityEffectWeakness:

void cEntityEffectWeakness::OnTick(cPawn & a_Target)
{
    super::OnTick(a_Target);

    // Damage reduction = 0.5 damage, multiplied by potion level (Weakness II = 1 damage)
    // double dmg_reduc = 0.5 * (a_Effect.GetIntensity() + 1);

    // TODO: Implement me!
    // TODO: Weakened villager zombies can be turned back to villagers with the god apple
}





// cEntityEffectPoison:

void cEntityEffectPoison::OnTick(cPawn & a_Target)
{
    super::OnTick(a_Target);

    if (a_Target.IsMob())
    {
        cMonster & Target = static_cast<cMonster &>(a_Target);

        // Doesn't effect undead mobs, spiders
        if (
            Target.IsUndead() ||
            (Target.GetMobType() == mtSpider) ||
            (Target.GetMobType() == mtCaveSpider)
        )
        {
            return;
        }
    }

    // Poison frequency = 25 ticks, divided by potion level (Poison II = 12 ticks)
    int frequency = FloorC(25.0 / static_cast<double>(m_Intensity + 1));

    if ((m_Ticks % frequency) == 0)
    {
        // Cannot take poison damage when health is at 1
        if (a_Target.GetHealth() > 1)
        {
            a_Target.TakeDamage(dtPoisoning, nullptr, 1, 0);
        }
    }
}





// cEntityEffectWither:

void cEntityEffectWither::OnTick(cPawn & a_Target)
{
    super::OnTick(a_Target);

    // Damage frequency = 40 ticks, divided by effect level (Wither II = 20 ticks)
    int frequency = FloorC(25.0 / static_cast<double>(m_Intensity + 1));

    if ((m_Ticks % frequency) == 0)
    {
        a_Target.TakeDamage(dtWither, nullptr, 1, 0);
    }
}





// cEntityEffectSaturation:

void cEntityEffectSaturation::OnTick(cPawn & a_Target)
{
    if (a_Target.IsPlayer())
    {
        cPlayer & Target = static_cast<cPlayer &>(a_Target);
        Target.SetFoodSaturationLevel(Target.GetFoodSaturationLevel() + (1 + m_Intensity));  // Increase saturation 1 per tick, adds 1 for every increase in level
    }
}