1 files changed, 137 insertions, 0 deletions

diff --git a/src/Items/ItemPotion.h b/src/Items/ItemPotion.h
new file mode 100644
index 000000000..e34b251aa
--- /dev/null
+++ b/src/Items/ItemPotion.h
@@ -0,0 +1,137 @@
+
+#pragma once
+
+#include "../Entities/EntityEffects.h"
+
+class cItemPotionHandler:
+public cItemHandler
+{
+	typedef cItemHandler super;
+	
+	cEntityEffect::eType GetEntityEffectType(short a_ItemDamage)
+	{
+		// Potion effect bits are different from entity effect values
+		// For reference: http://minecraft.gamepedia.com/Data_values#.22Potion_effect.22_bits
+		switch (a_ItemDamage & 15)
+		{
+			case 1:  return cEntityEffect::efRegeneration;
+			case 2:  return cEntityEffect::efSpeed;
+			case 3:  return cEntityEffect::efFireResistance;
+			case 4:  return cEntityEffect::efPoison;
+			case 5:  return cEntityEffect::efInstantHealth;
+			case 6:  return cEntityEffect::efNightVision;
+			case 8:  return cEntityEffect::efWeakness;
+			case 9:  return cEntityEffect::efStrength;
+			case 10: return cEntityEffect::efSlowness;
+			case 12: return cEntityEffect::efInstantDamage;
+			case 13: return cEntityEffect::efWaterBreathing;
+			case 14: return cEntityEffect::efInvisibility;
+			
+			// No effect potions
+			case 0:
+			case 7:
+			case 11:
+			case 15:
+			{
+				break;
+			}
+		}
+		
+		return cEntityEffect::efNoEffect;
+	}
+	
+	short GetEntityEffectIntensity(short a_ItemDamage)
+	{
+		// Level II potion if fifth bit is set
+		if (a_ItemDamage & 32) return 1;
+		else                   return 0;
+	}
+	
+	int GetEntityEffectDuration(short a_ItemDamage)
+	{
+		// Base duration in ticks
+		int base = 0;
+		double tier_multi = 1, ext_multi = 1, splash_multi = 1;
+		
+		switch (GetEntityEffectType(a_ItemDamage))
+		{
+			case cEntityEffect::efRegeneration:
+			case cEntityEffect::efPoison:
+			{
+				base = 900;
+				break;
+			}
+				
+			case cEntityEffect::efSpeed:
+			case cEntityEffect::efFireResistance:
+			case cEntityEffect::efNightVision:
+			case cEntityEffect::efStrength:
+			case cEntityEffect::efWaterBreathing:
+			case cEntityEffect::efInvisibility:
+			{
+				base = 3600;
+				break;
+			}
+				
+			case cEntityEffect::efWeakness:
+			case cEntityEffect::efSlowness:
+			{
+				base = 1800;
+				break;
+			}
+		}
+		
+		// If potion is level 2, half the duration. If not, stays the same
+		tier_multi   = GetEntityEffectIntensity(a_ItemDamage) > 0 ? 0.5       : 1;
+		
+		// If potion is extended, multiply duration by 8/3. If not, stays the same
+		// Extended potion if sixth bit is set
+		ext_multi    = a_ItemDamage & 64                          ? (8.0/3.0) : 1;
+		
+		// If potion is splash potion, multiply duration by 3/4. If not, stays the same
+		splash_multi = !IsDrinkable(a_ItemDamage)                 ? 0.75      : 1;
+		
+		// For reference: http://minecraft.gamepedia.com/Data_values#.22Tier.22_bit
+		//                http://minecraft.gamepedia.com/Data_values#.22Extended_duration.22_bit
+		//                http://minecraft.gamepedia.com/Data_values#.22Splash_potion.22_bit
+		
+		return base * tier_multi * ext_multi * splash_multi;
+	}
+	
+	bool IsDrinkable(short a_ItemDamage)
+	{
+		// Drinkable potion if 13th bit is set
+		// For reference: http://minecraft.gamepedia.com/Potions#Data_value_table
+		return a_ItemDamage & 8192;
+	}
+	
+public:
+	cItemPotionHandler():
+	super(E_ITEM_POTIONS)
+	{
+	}
+	
+	virtual bool IsDrinkable(const cItem * a_Item) override
+	{
+		return IsDrinkable(a_Item->m_ItemDamage);
+	}
+	
+	virtual bool OnItemUse(cWorld * a_World, cPlayer * a_Player, const cItem & a_Item, int a_BlockX, int a_BlockY, int a_BlockZ, eBlockFace a_Dir) override
+	{
+		// Called when potion is a splash potion
+		return true;
+	}
+	
+	virtual bool EatItem(cPlayer * a_Player, cItem * a_Item) override
+	{
+		// Called when potion is a drinkable potion
+		short potion_damage = a_Item->m_ItemDamage;
+		a_Player->AddEntityEffect(GetEntityEffectType(potion_damage),
+								  cEntityEffect(GetEntityEffectDuration(potion_damage),
+												GetEntityEffectIntensity(potion_damage),
+												a_Player));
+		a_Player->GetInventory().RemoveOneEquippedItem();
+		a_Player->GetInventory().AddItem(E_ITEM_GLASS_BOTTLE);
+		return true;
+	}
+};