package WayofTime.bloodmagic.api.soul;

import net.minecraft.item.ItemStack;

public interface IDemonWill
{
    /**
     * Obtains the amount of Will an ItemStack contains.
     * 
     * @param willStack
     *        - The stack to retrieve the Will from
     * 
     * @return - The amount of Will an ItemStack contains
     */
    double getWill(ItemStack willStack);

    /**
     * Sets the amount of Will in a given ItemStack.
     * 
     * @param willStack
     *        - The ItemStack of the Will
     * @param will
     *        - The amount of will to set the stack to
     */
    void setWill(ItemStack willStack, double will);

    /**
     * Drains the demonic will from the willStack. If all of the will is
     * drained, the willStack will be removed.
     * 
     * @param willStack
     *        - The ItemStack of the will
     * @param drainAmount
     *        - The amount of Will to drain
     * 
     * @return The amount of will drained.
     */
    double drainWill(ItemStack willStack, double drainAmount);

    /**
     * Creates a new ItemStack with the specified number of will. Implementation
     * should respect the number requested.
     * 
     * @param meta
     *        - The meta of the ItemStack to create
     * @param number
     *        - The amount of Will to create the Stack with.
     * 
     * @return - An ItemStack with the set amount of Will
     */
    ItemStack createWill(int meta, double number);
}