/*
 * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
 *
 * This program 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 (at your
 * option) any later version.
 *
 * This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef CREATUREAIIMPL_H
#define CREATUREAIIMPL_H

#include "Random.h"
#include <type_traits>
#include <functional>

class WorldObject;
enum Difficulty : uint8;

template<typename First, typename Second, typename... Rest>
inline First const& RAND(First const& first, Second const& second, Rest const&... rest)
{
    std::reference_wrapper<typename std::add_const<First>::type> const pack[] = { first, second, rest... };
    return pack[urand(0, sizeof...(rest) + 1)].get();
}

enum AITarget
{
    AITARGET_SELF,
    AITARGET_VICTIM,
    AITARGET_ENEMY,
    AITARGET_ALLY,
    AITARGET_BUFF,
    AITARGET_DEBUFF
};

enum AICondition
{
    AICOND_AGGRO,
    AICOND_COMBAT,
    AICOND_DIE
};

#define AI_DEFAULT_COOLDOWN 5000

// Spell targets used by SelectSpell
enum SelectTargetType : uint8
{
    SELECT_TARGET_DONTCARE = 0,  // All target types allowed
    SELECT_TARGET_SELF,          // Only Self casting
    SELECT_TARGET_SINGLE_ENEMY,  // Only Single Enemy
    SELECT_TARGET_AOE_ENEMY,     // Only AoE Enemy
    SELECT_TARGET_ANY_ENEMY,     // AoE or Single Enemy
    SELECT_TARGET_SINGLE_FRIEND, // Only Single Friend
    SELECT_TARGET_AOE_FRIEND,    // Only AoE Friend
    SELECT_TARGET_ANY_FRIEND     // AoE or Single Friend
};

// Spell Effects used by SelectSpell
enum SelectEffect : uint8
{
    SELECT_EFFECT_DONTCARE = 0, // All spell effects allowed
    SELECT_EFFECT_DAMAGE,       // Spell does damage
    SELECT_EFFECT_HEALING,      // Spell does healing
    SELECT_EFFECT_AURA          // Spell applies an aura
};

struct AISpellInfoType
{
    AISpellInfoType() : target(AITARGET_SELF), condition(AICOND_COMBAT)
        , cooldown(AI_DEFAULT_COOLDOWN), realCooldown(0), maxRange(0.0f), Targets(0), Effects(0) { }
    AITarget target;
    AICondition condition;
    Milliseconds cooldown;
    Milliseconds realCooldown;
    float maxRange;

    uint8 Targets;                                          // set of enum SelectTarget
    uint8 Effects;                                          // set of enum SelectEffect
};

AISpellInfoType* GetAISpellInfo(uint32 spellId, Difficulty difficulty);

TC_GAME_API bool InstanceHasScript(WorldObject const* obj, char const* scriptName);

template <class AI, class T>
AI* GetInstanceAI(T* obj, char const* scriptName)
{
    if (InstanceHasScript(obj, scriptName))
        return new AI(obj);

    return nullptr;
}

#endif