/*
 *  The Mana Server
 *  Copyright (C) 2004-2010  The Mana World Development Team
 *
 *  This file is part of The Mana Server.
 *
 *  The Mana Server is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  The Mana Server is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with The Mana Server.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef ITEM_H
#define ITEM_H

#include <vector>

#include "game-server/actor.h"

class Being;
class Script;

// Indicates the equip slot "cost" to equip an item.
struct ItemEquipRequirement {
    ItemEquipRequirement():
        equipSlotId(0),
        capacityRequired(0)
    {}

    unsigned int equipSlotId, capacityRequired;
};

/**
 * State effects to beings, and actors.
 * States can be multiple for the same being.
 */
enum
{
    SET_STATE_NORMAL = 0,
    SET_STATE_POISONED,
    SET_STATE_STONED,
    SET_STATE_STUNNED,
    SET_STATE_SLOWED,
    SET_STATE_TIRED,
    SET_STATE_MAD,
    SET_STATE_BERSERK,
    SET_STATE_HASTED,
    SET_STATE_FLOATING,

    SET_STATE_NOT_POISONED,
    SET_STATE_NOT_STONED,
    SET_STATE_NOT_STUNNED,
    SET_STATE_NOT_SLOWED,
    SET_STATE_NOT_TIRED,
    SET_STATE_NOT_MAD,
    SET_STATE_NOT_BERSERK,
    SET_STATE_NOT_HASTED,
    SET_STATE_NOT_FLOATING
};

struct ItemAutoAttackInfo
{
    unsigned int base;
    unsigned int range;
    unsigned int baseSpeed;
    unsigned int skillId;
    /// attribute id -> damage bonus per point
    std::map< unsigned int, double > attrBonus;
};

enum ItemTriggerType
{
    ITT_NULL = 0,
    ITT_IN_INVY, // Associated effects apply when the item is in the inventory
    ITT_ACTIVATE, // Associated effects apply when the item is activated
    ITT_EQUIP, // Assosciated effects apply when the item is equipped
    ITT_LEAVE_INVY, // Associated effects apply when the item leaves the inventory
    ITT_UNEQUIP, // Associated effects apply when the item is unequipped
    ITT_EQUIPCHG // When the item is still equipped, but in a different way
};

enum ItemEffectType
{
    // Effects that are removed automatically when the trigger ends
    // (ie. item no longer exists in invy, unequipped)
    IET_ATTR_MOD = 0, // Modify a given attribute with a given value
    IET_AUTOATTACK, // Give the associated being an autoattack
    // Effects that do not need any automatic removal
    IET_COOLDOWN, // Set a cooldown to this item, preventing activation for n ticks
    IET_G_COOLDOWN, // Set a cooldown to all items of this type for this being
    IET_SCRIPT // Call an associated lua script with given variables
};

class ItemEffectInfo
{
    public:
        virtual bool apply(Being *itemUser) = 0;
        virtual void dispell(Being *itemUser) = 0;
};

class ItemEffectAttrMod : public ItemEffectInfo
{
    public:
        ItemEffectAttrMod(unsigned int attrId, unsigned int layer, double value,
                          unsigned int id, unsigned int duration = 0) :
                        mAttributeId(attrId), mAttributeLayer(layer),
                        mMod(value), mDuration(duration), mId(id) {}

        bool apply(Being *itemUser);
        void dispell(Being *itemUser);

    private:
        unsigned int mAttributeId;
        unsigned int mAttributeLayer;
        double mMod;
        unsigned int mDuration;
        unsigned int mId;
};

class ItemEffectAutoAttack : public ItemEffectInfo
{
    public:
        bool apply(Being *itemUser);
        void dispell(Being *itemUser);
};

class ItemEffectConsumes : public ItemEffectInfo
{
    public:
        bool apply(Being *)
        { return true; }
        void dispell(Being *)
        {}
};

class ItemEffectScript : public ItemEffectInfo
{
    public:
        ItemEffectScript(int itemId, Script *script,
                         const std::string& activateFunctionName,
                         const std::string& dispellFunctionName):
            mItemId(0),
            mScript(script),
            mActivateFunctionName(activateFunctionName),
            mDispellFunctionName(dispellFunctionName)
        {}

        ~ItemEffectScript();

        bool apply(Being *itemUser);
        void dispell(Being *itemUser);
    private:
        int mItemId;
        Script *mScript;
        std::string mActivateFunctionName;
        std::string mDispellFunctionName;
};


/**
 * Class for simple reference to item information.
 */
class ItemClass
{
    public:
        ItemClass(int id, unsigned int maxperslot):
            mDatabaseID(id),
            mName("unnamed"),
            mSpriteID(0),
            mCost(0),
            mMaxPerSlot(maxperslot)
        {}

        ~ItemClass()
        { resetEffects(); }

        /**
         * Returns the name of the item type
         */
        const std::string &getName() const
        { return mName; }

        /**
         * Sets the name of the item type
         */
        void setName(const std::string &name)
        { mName = name; }

        /**
         * Applies the modifiers of an item to a given user.
         * @return true if item should be removed.
         */
        bool useTrigger(Being *itemUser, ItemTriggerType trigger);

        /**
         * Gets unit cost of these items.
         */
        int getCost() const
        { return mCost; }

        /**
         * Gets max item per slot.
         */
        unsigned int getMaxPerSlot() const
        { return mMaxPerSlot; }

        bool hasTrigger(ItemTriggerType id)
        { return mEffects.count(id); }

        /**
         * Gets database ID.
         */
        int getDatabaseID() const
        { return mDatabaseID; }

        /**
         * Gets the sprite ID.
         * @note At present this is only a stub, and will always return zero.
         *       When you would want to extend serializeLooks to be more
         *       efficient, keep track of a sprite id here.
         */
        int getSpriteID() const
        { return mSpriteID; }

        /**
         * Returns equip requirement.
         */
        const ItemEquipRequirement &getItemEquipRequirement() const
        { return mEquipReq; }

    private:
        /**
         * Add an effect to a trigger
         * @param effect  The effect to be run when the trigger is hit.
         * @param id      The trigger type.
         * @param dispell The trigger that the effect should be dispelled on.
         * @note  FIXME:  Should be more than one trigger that an effect
         *                can be dispelled from.
         */
        void addEffect(ItemEffectInfo *effect,
                       ItemTriggerType id,
                       ItemTriggerType dispell = ITT_NULL)
        {
            mEffects.insert(std::make_pair(id, effect));
            if (dispell)
                mDispells.insert(std::make_pair(dispell, effect));
        }

        void resetEffects()
        {
            while (mEffects.begin() != mEffects.end())
            {
                delete mEffects.begin()->second;
                mEffects.erase(mEffects.begin());
            }
            while (mDispells.begin() != mDispells.end())
            {
                delete mDispells.begin()->second;
                mDispells.erase(mDispells.begin());
            }
        }

        unsigned short mDatabaseID; /**< Item reference information */
        std::string mName; /**< name used to identify the item class */
        /** The sprite that should be shown to the character */
        unsigned short mSpriteID;
        unsigned short mCost;     /**< Unit cost the item. */
        /** Max item amount per slot in inventory. */
        unsigned int mMaxPerSlot;

        std::multimap< ItemTriggerType, ItemEffectInfo * > mEffects;
        std::multimap< ItemTriggerType, ItemEffectInfo * > mDispells;

        /**
         * Requirement for equipping.
         */
        ItemEquipRequirement mEquipReq;

        friend class ItemManager;
};

/**
 * Class for an item stack laying on the floor in the game world
 */
class Item : public Actor
{
    public:
        Item(ItemClass *type, int amount);

        ItemClass *getItemClass() const
        { return mType; }

        int getAmount() const
        { return mAmount; }

        virtual void update();

    private:
        ItemClass *mType;
        unsigned char mAmount;
        int mLifetime;
};

#endif // ITEM_H