Implemented mana discount.

src/main/java/vazkii/botania/api/mana/IManaDiscountArmor.java

@@ -0,0 +1,30 @@
+/**
+ * This class was created by <Vazkii>. It's distributed as
+ * part of the Botania Mod. Get the Source Code in github:
+ * https://github.com/Vazkii/Botania
+ * 
+ * Botania is Open Source and distributed under the
+ * Botania License: http://botaniamod.net/license.php
+ * 
+ * File Created @ [Jan 28, 2015, 9:22:53 PM (GMT)]
+ */
+package vazkii.botania.api.mana;
+
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+
+/**
+ * An armor item that implements this can provide a mana discount for mana tools.
+ * Mana tools are the ones on the main toolset (Pick, Shovel, Axe, Sword and Shovel).
+ */
+public interface IManaDiscountArmor {
+
+	/**
+	 * Gets the mana discount that this piece of armor provides. This is added
+	 * together to create the full discount.
+	 * Value is to be from 0.0 to 1.0. 0.1 is 10% discount, as an example.
+	 * You can also return negative values to make tools cost more.
+	 */
+	public float getDiscount(ItemStack stack, int slot, EntityPlayer player);
+	
+}

src/main/java/vazkii/botania/api/mana/ManaItemHandler.java

@@ -197,4 +197,47 @@ public final class ManaItemHandler {
 
 		return false;
 	}
+	
+	/**
+	 * Requests mana from items in a given player's inventory. This version also
+	 * checks for IManaDiscountArmor items equipped to lower the cost.
+	 * @param manaToGet How much mana is to be requested, if less mana exists than this amount,
+	 * the amount of mana existent will be returned instead, if you want exact values use requestManaExact.
+	 * @param remove If true, the mana will be removed from the target item. Set to false to just check.
+	 * @return The amount of mana received from the request.
+	 */
+	public static int requestManaForTool(ItemStack stack, EntityPlayer player, int manaToGet, boolean remove) {
+		float multiplier = 1F - getFullDiscountForTools(player);
+		int cost = (int) ((float) manaToGet * multiplier);
+		return (int) ((float) requestMana(stack, player, cost, remove) / multiplier);
+	}
+
+	/**
+	 * Requests an exact amount of mana from items in a given player's inventory. This version also
+	 * checks for IManaDiscountArmor items equipped to lower the cost.
+	 * @param manaToGet How much mana is to be requested, if less mana exists than this amount,
+	 * false will be returned instead, and nothing will happen.
+	 * @param remove If true, the mana will be removed from the target item. Set to false to just check.
+	 * @return If the request was succesful.
+	 */
+	public static boolean requestManaExactForTool(ItemStack stack, EntityPlayer player, int manaToGet, boolean remove) {
+		float multiplier = 1F - getFullDiscountForTools(player);
+		int cost = (int) ((float) manaToGet * multiplier);
+		return requestManaExact(stack, player, cost, remove);
+	}
+	
+	/**
+	 * Gets the sum of all the discounts on IManaDiscountArmor items equipped
+	 * on the player passed in. 
+	 */
+	public static float getFullDiscountForTools(EntityPlayer player) {
+		float discount = 0F;
+		for(int i = 0; i < player.inventory.armorInventory.length; i++) {
+			ItemStack armor = player.inventory.armorInventory[i];
+			if(armor != null && armor.getItem() instanceof IManaDiscountArmor)
+				discount += ((IManaDiscountArmor) armor.getItem()).getDiscount(armor, i, player);
+		}
+		
+		return discount;
+	}
 }

src/main/java/vazkii/botania/common/item/equipment/armor/manasteel/ItemManasteelHelm.java

@@ -10,9 +10,12 @@
  */
 package vazkii.botania.common.item.equipment.armor.manasteel;
 
+import net.minecraft.entity.player.EntityPlayer;
+import net.minecraft.item.ItemStack;
+import vazkii.botania.api.mana.IManaDiscountArmor;
 import vazkii.botania.common.lib.LibItemNames;
 
-public class ItemManasteelHelm extends ItemManasteelArmor {
+public class ItemManasteelHelm extends ItemManasteelArmor implements IManaDiscountArmor {
 
 	public ItemManasteelHelm() {
 		this(LibItemNames.MANASTEEL_HELM);
@@ -22,4 +25,9 @@ public class ItemManasteelHelm extends ItemManasteelArmor {
 		super(0, name);
 	}
 
+	@Override
+	public float getDiscount(ItemStack stack, int slot, EntityPlayer player) {
+		return hasArmorSet(player) ? 0.1F : 0F;
+	}
+
 }

src/main/java/vazkii/botania/common/item/equipment/tool/ToolCommons.java

@@ -30,7 +30,7 @@ public final class ToolCommons {
 
 	public static void damageItem(ItemStack stack, int dmg, EntityLivingBase entity, int manaPerDamage) {
 		int manaToRequest = dmg * manaPerDamage;
-		boolean manaRequested = entity instanceof EntityPlayer ? ManaItemHandler.requestManaExact(stack, (EntityPlayer) entity, manaToRequest, true) : false;
+		boolean manaRequested = entity instanceof EntityPlayer ? ManaItemHandler.requestManaExactForTool(stack, (EntityPlayer) entity, manaToRequest, true) : false;
 
 		if(!manaRequested)
 			stack.damageItem(dmg, entity);

src/main/java/vazkii/botania/common/item/equipment/tool/manasteel/ItemManasteelAxe.java

@@ -100,7 +100,7 @@ public class ItemManasteelAxe extends ItemAxe implements IManaUsingItem {
 
 	@Override
 	public void onUpdate(ItemStack stack, World world, Entity player, int par4, boolean par5) {
-		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExact(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
+		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExactForTool(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
 			stack.setItemDamage(stack.getItemDamage() - 1);
 	}
 

src/main/java/vazkii/botania/common/item/equipment/tool/manasteel/ItemManasteelPick.java

@@ -103,7 +103,7 @@ public class ItemManasteelPick extends ItemPickaxe implements IManaUsingItem {
 
 	@Override
 	public void onUpdate(ItemStack stack, World world, Entity player, int par4, boolean par5) {
-		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExact(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
+		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExactForTool(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
 			stack.setItemDamage(stack.getItemDamage() - 1);
 	}
 

src/main/java/vazkii/botania/common/item/equipment/tool/manasteel/ItemManasteelShears.java

@@ -129,7 +129,7 @@ public class ItemManasteelShears extends ItemShears implements IManaUsingItem {
 
 	@Override
 	public void onUpdate(ItemStack stack, World world, Entity player, int par4, boolean par5) {
-		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExact(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
+		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExactForTool(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
 			stack.setItemDamage(stack.getItemDamage() - 1);
 	}
 

src/main/java/vazkii/botania/common/item/equipment/tool/manasteel/ItemManasteelShovel.java

@@ -116,7 +116,7 @@ public class ItemManasteelShovel extends ItemSpade implements IManaUsingItem {
 
 	@Override
 	public void onUpdate(ItemStack stack, World world, Entity player, int par4, boolean par5) {
-		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExact(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
+		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExactForTool(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
 			stack.setItemDamage(stack.getItemDamage() - 1);
 	}
 

src/main/java/vazkii/botania/common/item/equipment/tool/manasteel/ItemManasteelSword.java

@@ -94,7 +94,7 @@ public class ItemManasteelSword extends ItemSword implements IManaUsingItem {
 
 	@Override
 	public void onUpdate(ItemStack stack, World world, Entity player, int par4, boolean par5) {
-		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExact(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
+		if(!world.isRemote && player instanceof EntityPlayer && stack.getItemDamage() > 0 && ManaItemHandler.requestManaExactForTool(stack, (EntityPlayer) player, MANA_PER_DAMAGE * 2, true))
 			stack.setItemDamage(stack.getItemDamage() - 1);
 	}