/*
 * 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 TRINITY_GAMEOBJECTAI_H
#define TRINITY_GAMEOBJECTAI_H

#include "Define.h"
#include "LootItemType.h"
#include "ObjectGuid.h"
#include "Optional.h"

class Creature;
class GameObject;
class Player;
class Quest;
class SpellInfo;
class Unit;
class WorldObject;
enum class QuestGiverStatus : uint64;

namespace WorldPackets
{
    namespace Battleground
    {
        enum class BattlegroundCapturePointState : uint8;
    }
}

class TC_GAME_API GameObjectAI
{
    private:
        // Script Id
        uint32 const _scriptId;

    protected:
        GameObject* const me;

    public:
        explicit GameObjectAI(GameObject* go, uint32 scriptId = {}) noexcept;
        GameObjectAI(GameObjectAI const&) = delete;
        GameObjectAI(GameObjectAI&&) = delete;
        GameObjectAI& operator=(GameObjectAI const&) = delete;
        GameObjectAI& operator=(GameObjectAI&&) = delete;
        virtual ~GameObjectAI();

        // Gets the id of the AI (script id)
        uint32 GetId() const { return _scriptId; }

        virtual void UpdateAI(uint32 /*diff*/) { }

        virtual void InitializeAI() { Reset(); }

        virtual void Reset() { }

        // Pass parameters between AI
        virtual void DoAction([[maybe_unused]] int32 param) { }
        virtual void SetGUID([[maybe_unused]] ObjectGuid const& guid, [[maybe_unused]] int32 id) { }
        virtual ObjectGuid GetGUID([[maybe_unused]] int32 id) const { return ObjectGuid::Empty; }

        static int32 Permissible(GameObject const* go);

        // Called when the dialog status between a player and the gameobject is requested.
        virtual Optional<QuestGiverStatus> GetDialogStatus(Player const* player);

        // Called when a player opens a gossip dialog with the gameobject.
        virtual bool OnGossipHello(Player* /*player*/) { return false; }

        // Called when a player selects a gossip item in the gameobject's gossip menu.
        virtual bool OnGossipSelect(Player* /*player*/, uint32 /*menuId*/, uint32 /*gossipListId*/) { return false; }

        // Called when a player selects a gossip with a code in the gameobject's gossip menu.
        virtual bool OnGossipSelectCode(Player* /*player*/, uint32 /*menuId*/, uint32 /*gossipListId*/, char const* /*code*/) { return false; }

        // Called when a player accepts a quest from the gameobject.
        virtual void OnQuestAccept(Player* /*player*/, Quest const* /*quest*/) { }

        // Called when a player completes a quest and is rewarded, opt is the selected item's index or 0
        virtual void OnQuestReward(Player* /*player*/, Quest const* /*quest*/, LootItemType /*type*/, uint32 /*opt*/) { }

        // Called when a Player clicks a GameObject, before GossipHello
        // prevents achievement tracking if returning true
        virtual bool OnReportUse(Player* /*player*/) { return false; }

        virtual void Destroyed(WorldObject* /*attacker*/, uint32 /*eventId*/) { }
        virtual void Damaged(WorldObject* /*attacker*/, uint32 /*eventId*/) { }

        virtual uint32 GetData(uint32 /*id*/) const { return 0; }
        virtual void SetData64(uint32 /*id*/, uint64 /*value*/) { }
        virtual uint64 GetData64(uint32 /*id*/) const { return 0; }
        virtual void SetData(uint32 /*id*/, uint32 /*value*/) { }

        virtual void OnGameEvent(bool /*start*/, uint16 /*eventId*/) { }
        virtual void OnLootStateChanged(uint32 /*state*/, Unit* /*unit*/) { }
        virtual void OnStateChanged(uint32 /*state*/) { }
        virtual void EventInform(uint32 /*eventId*/) { }

        // Called when hit by a spell
        virtual void SpellHit(WorldObject* /*caster*/, SpellInfo const* /*spellInfo*/) { }

        // Called when spell hits a target
        virtual void SpellHitTarget(WorldObject* /*target*/, SpellInfo const* /*spellInfo*/) { }

        // Called when the gameobject summon successfully other creature
        virtual void JustSummoned(Creature* /*summon*/) { }

        virtual void SummonedCreatureDespawn(Creature* /*summon*/) { }
        virtual void SummonedCreatureDies(Creature* /*summon*/, Unit* /*killer*/) { }

        // Called when the capture point gets assaulted by a player. Return true to disable default behaviour.
        virtual bool OnCapturePointAssaulted(Player* /*player*/) { return false; }
        // Called when the capture point state gets updated. Return true to disable default behaviour.
        virtual bool OnCapturePointUpdated(WorldPackets::Battleground::BattlegroundCapturePointState /*state*/) { return false; }
};

class TC_GAME_API NullGameObjectAI : public GameObjectAI
{
    public:
        using GameObjectAI::GameObjectAI;

        void UpdateAI(uint32 /*diff*/) override { }

        static int32 Permissible(GameObject const* go);
};
#endif