#ifndef __ENTITY__H__
#define __ENTITY__H__

#include <memory>
#include <functional>
#include <unordered_map>
#include <vector>

#include "dCommonVars.h"
#include "NiPoint3.h"
#include "NiQuaternion.h"
#include "eKillType.h"

namespace Loot {
	class Info;
};

namespace tinyxml2 {
	class XMLDocument;
};

namespace CppScripts {
	class Script;
};

class Player;
class EntityInfo;
class User;
class Spawner;
class ScriptComponent;
class dpEntity;
class EntityTimer;
class Component;
class Item;
class Character;
class EntityCallbackTimer;
class LDFBaseData;
class BoxDimensions;
enum class eTriggerEventType;
enum class eGameMasterLevel : uint8_t;
enum class eReplicaComponentType : uint32_t;
enum class eReplicaPacketType : uint8_t;
enum class eCinematicEvent : uint32_t;

/**
 * An entity in the world.
 * Entities are composed of components which define their behavior.
 */

using ComponentPtr = std::unique_ptr<Component>;
using ComponentWhitelist = std::vector<eReplicaComponentType>;
using TemplateComponents = std::vector<std::pair<eReplicaComponentType, uint32_t>>;

class Entity {
public:
	explicit Entity(const LWOOBJID& objectID, EntityInfo info, Entity* parentEntity = nullptr);
	virtual ~Entity();

	void ApplyComponentWhitelist(TemplateComponents& components) const;
	static const std::vector<ComponentWhitelist>& GetComponentWhitelists() { return m_ComponentWhitelists; }

	/**
	 * Functions used for creating and setting up an Entity.
	 */
	void Initialize();

	/**
	 * There are some very very edge cases we need to take care of with what components
	 * are kept and removed. Here is where we take care of those cases.
	 */
	void ApplyComponentBlacklist(TemplateComponents& components) const;

	// For adding and removing components based on LDF keys
	void ApplyComponentConfig(TemplateComponents& components) const;

	// Paths have several components they could add. This function will add them.
	void AddPathComponent(TemplateComponents& components) const;

	/**
	 * Determines if we should ghost an Entity or not.
	 * Ghosting means we no longer serialize it to a specific player because it is out of range.
	 */
	void IsGhosted();

	bool operator==(const Entity& other) const;
	bool operator!=(const Entity& other) const;

	// General Entity info
	const LWOOBJID GetObjectID() const { return m_ObjectID; }

	const LOT GetLOT() const { return m_TemplateID; }

	Entity* GetParentEntity() const { return m_ParentEntity; }

	const bool GetIsGhostingCandidate() const { return m_IsGhostingCandidate; }

	const float GetDefaultScale() const { return m_Scale; }

	Entity* GetOwner() const;
	void SetOwnerOverride(const LWOOBJID& value) { m_OwnerOverride = value; };
	Entity* GetScheduledKiller() { return m_ScheduleKiller; }
	std::vector<LWOOBJID>& GetTargetsInPhantom();
	const std::unordered_map<eReplicaComponentType, ComponentPtr>& GetComponents() { return m_Components; }

	// Position related info
	const NiPoint3& GetDefaultPosition() const { return m_DefaultPosition; };

	const NiQuaternion& GetDefaultRotation() const { return m_DefaultRotation; };

	const NiPoint3& GetPosition() const;
	void SetPosition(const NiPoint3& position);

	const NiQuaternion& GetRotation() const;
	void SetRotation(const NiQuaternion& rotation);

	virtual NiPoint3 GetRespawnPosition() const { return NiPoint3::ZERO; }
	virtual NiQuaternion GetRespawnRotation() const { return NiQuaternion::IDENTITY; }

	// Spawner related info
	Spawner* GetSpawner() const { return m_Spawner; }

	LWOOBJID GetSpawnerID() const { return m_SpawnerID; }

	const std::vector<std::string>& GetGroups() { return m_Groups; };
	void SetGroups(const std::vector<std::string>& value) { m_Groups = value; }
	void AddGroup(const std::string& group);

	// LDF related into
	const std::vector<LDFBaseData*>& GetSettings() const { return m_Settings; }

	const std::vector<LDFBaseData*>& GetNetworkSettings() const { return m_NetworkSettings; }

	// Networking related info
	const int8_t GetObservers() const { return m_Observers; }
	void SetObservers(const int8_t value);

	const uint16_t GetNetworkId() const { return m_NetworkID; }
	void SetNetworkId(const uint16_t id) { m_NetworkID = id; }

	// Player extended info
	virtual User* GetParentUser() const { return nullptr; };

	virtual const SystemAddress GetSystemAddress() const { return UNASSIGNED_SYSTEM_ADDRESS; };

	virtual void SetRespawnPosition(const NiPoint3& position) {};

	virtual void SetRespawnRotation(const NiQuaternion& rotation) {};

	virtual void SetSystemAddress(const SystemAddress& value) {};

	eGameMasterLevel GetGMLevel() const { return m_GMLevel; }
	void SetGMLevel(const eGameMasterLevel value);

	bool GetPlayerReadyForUpdates() const { return m_PlayerIsReadyForUpdates; }
	void SetPlayerReadyForUpdates() { m_PlayerIsReadyForUpdates = true; }

	Character* GetCharacter() const { return m_Character; }
	void SetCharacter(Character* value) { m_Character = value; }
	// End info

	// If you are calling this, then calling GetComponent<T>, just call GetComponent<T> and check for nullptr.
	bool HasComponent(const eReplicaComponentType componentId) const;

	// Event management
	/**
	 * Call these when you want to observe events. Observed events should follow the following naming convention
	 * in scripts Notify<NotificationName>. For example, if you want to observe the "OnDeath" event, you would call
	 * entity->Subscribe(script, "OnDeath"). Then in your script, you would have a function called NotifyOnDeath.
	 */
	void Subscribe(CppScripts::Script* scriptToAdd, const std::string& notificationName);

	/**
	 * Call this when you want to stop observing an event. The scriptToRemove will
	 * no longer be notified of notificationName events
	 */
	void Unsubscribe(CppScripts::Script* scriptToRemove, const std::string& notificationName);

	// Proximity radius management
	void AddProximityRadius(const float proxRadius, const std::string& name);
	void AddProximityRadius(const BoxDimensions& dimensions, const std::string& name);

	// Technically this is the live accrate API, however what it does is not setting the proximity radius, but rather
	// adding a new one to the list of proximity radii. For that reason we will have the old API just call AddProximityRadius.
	inline void SetProximityRadius(const float proxRadius, const std::string& name) { this->AddProximityRadius(proxRadius, name); }
	inline void SetProximityRadius(const BoxDimensions& dimensions, const std::string& name) { this->AddProximityRadius(dimensions, name); }

	void AddRebuildCompleteCallback(const std::function<void(Entity* user)>& callback) const;
	void AddCollisionPhantomCallback(const std::function<void(Entity* target)>& callback) { m_PhantomCollisionCallbacks.push_back(callback); };
	void AddDieCallback(const std::function<void()>& callback) { m_DieCallbacks.push_back(callback); };
	void TriggerEvent(const eTriggerEventType event, Entity* optionalTarget = nullptr);
	void NotifyObject(Entity* sender, const std::u16string& name, const int32_t param1 = 0, const int32_t param2 = 0);

	// Parent Child management
	void AddChild(Entity* child);
	void RemoveChild(Entity* child);
	void RemoveParent();

	// Timer management
	void AddTimer(const std::string& name, const float time);
	void AddCallbackTimer(const float time, const std::function<void()>& callback);
	bool HasTimer(const std::string& name);
	void CancelCallbackTimers();
	void CancelAllTimers();
	void CancelTimer(const std::string& name);

	// Serialization
	void WriteBaseReplicaData(RakNet::BitStream* outBitStream, const eReplicaPacketType packetType);
	void WriteComponents(RakNet::BitStream* outBitStream, const eReplicaPacketType packetType);

	// Scripting
	// Get the script attached to this entity. Will never return nullptr.
	CppScripts::Script* GetScript() const;
	void OnCollisionProximity(const LWOOBJID otherEntity, const std::string& proxName, const std::string& status);
	void OnCollisionPhantom(const LWOOBJID otherEntity);
	void OnCollisionLeavePhantom(const LWOOBJID otherEntity);

	void OnFireEventServerSide(Entity* sender, const std::string args, const int32_t param1 = -1, const int32_t param2 = -1, const int32_t param3 = -1);
	void OnActivityStateChangeRequest(const LWOOBJID senderID, const int32_t value1, const int32_t value2,
		const std::u16string& stringValue);
	void OnCinematicUpdate(Entity* self, Entity* sender, const eCinematicEvent event, const std::u16string& pathName,
		const float pathTime, const float totalTime, const int32_t waypoint);

	void OnEmoteReceived(const int32_t emote, Entity* target);

	void OnUse(Entity* originator);

	void OnHitOrHealResult(Entity* attacker, const int32_t damage);
	void OnHit(Entity* attacker);

	void OnZonePropertyEditBegin();
	void OnZonePropertyEditEnd();
	void OnZonePropertyModelEquipped();
	void OnZonePropertyModelPlaced(Entity* player);
	void OnZonePropertyModelPickedUp(Entity* player);
	void OnZonePropertyModelRemoved(Entity* player);
	void OnZonePropertyModelRemovedWhileEquipped(Entity* player);
	void OnZonePropertyModelRotated(Entity* player);

	void OnMessageBoxResponse(Entity* sender, const int32_t button, const std::u16string& identifier, const std::u16string& userData);
	void OnChoiceBoxResponse(Entity* sender, const int32_t button, const std::u16string& buttonIdentifier, const std::u16string& identifier);
	void RequestActivityExit(Entity* sender, const LWOOBJID& player, const bool canceled);
	// End scripting

	// Cleanup functions
	void Smash(const LWOOBJID source = LWOOBJID_EMPTY, const eKillType killType = eKillType::VIOLENT, const std::u16string& deathType = u"");
	// Odds are you do not need to call this. Call Smash instead.
	void Kill(Entity* murderer = nullptr);

	void ScheduleKillAfterUpdate(Entity* murderer = nullptr);
	void ScheduleDestructionAfterUpdate() { m_ShouldDestroyAfterUpdate = true; }

	void Resurrect();

	// Loot management (should be moved to Player. Not every Entity needs this.)
	void AddLootItem(const Loot::Info& info);
	void PickupItem(const LWOOBJID& objectID);

	bool CanPickupCoins(const uint64_t& count) const;
	void PickupCoins(const uint64_t& count);
	void RegisterCoinDrop(const uint64_t& count);

	// State checkers
	void Sleep();
	void Wake();
	bool IsSleeping() const;
	bool IsDead() const;
	bool IsPlayer() const;

	// Update
	void UpdateXMLDoc(tinyxml2::XMLDocument* doc);
	void Update(float deltaTime);
	/**
	 * Utility
	 */

	//Retroactively corrects the model vault size due to incorrect initialization in a previous patch.
	void RetroactiveVaultSize();
	void ResetFlags();

	// LDF Setting accessors
	bool GetBoolean(const std::u16string& name) const { return GetVar<bool>(name); };
	int32_t GetI32(const std::u16string& name) const { return GetVar<int32_t>(name); };
	int64_t GetI64(const std::u16string& name) const { return GetVar<int64_t>(name); };
	bool HasVar(const std::u16string& name) const;
	LDFBaseData* GetVarData(const std::u16string& name) const;

	/**
	 * Get the LDF value and convert it to a string.
	 */
	std::string GetVarAsString(const std::u16string& name) const;

	// LDF Setting assignment shorthands
	void SetBoolean(const std::u16string& name, bool value) { SetVar<bool>(name, value); }
	void SetI32(const std::u16string& name, int32_t value) { SetVar<int32_t>(name, value); };
	void SetI64(const std::u16string& name, int64_t value) { SetVar<int64_t>(name, value); };

	// Template declarations
	template<typename T>
	const T& GetVar(const std::u16string& name) const;

	template<typename T>
	T GetVarAs(const std::u16string& name) const;

	template<typename T>
	void SetVar(const std::u16string& name, const T& value);

	template<typename T>
	T GetNetworkVar(const std::u16string& name);

	void SendNetworkVar(const std::string& data, const SystemAddress& sysAddr);

	template<typename T>
	void SetNetworkVar(const std::u16string& name, const T& value, const SystemAddress& sysAddr = UNASSIGNED_SYSTEM_ADDRESS);

	template<typename T>
	void SetNetworkVar(const std::u16string& name, const std::vector<T>& value, const SystemAddress& sysAddr = UNASSIGNED_SYSTEM_ADDRESS);
	/**
	 * @brief Get a non-owning reference to a component
	 *
	 * @tparam Cmpt The component to get a non-owning reference of
	 * @return Cmpt* The non-owning pointer to the component
	 */
	template<typename Cmpt>
	Cmpt* GetComponent() const;

	/**
	 * @brief Adds a component to this Entity.
	 *
	 * @tparam Cmpt The component to create
	 * @tparam ConstructorValues The constructor values to forward to the component
	 * @param arguments The constructor values to forward to the component
	 * @return Cmpt* A non-owning pointer to the created component,
	 * or a non-owning pointer to the existing component if the component already existed.
	 */
	template<typename Cmpt, typename...ConstructorValues>
	Cmpt* AddComponent(ConstructorValues... arguments);

	/**
	 * @brief Removes a component from this Entity.
	 */
	template<typename Cmpt>
	void RemoveComponent();

protected:
	LWOOBJID m_ObjectID;

	LOT m_TemplateID;

	std::vector<LDFBaseData*> m_Settings;
	std::vector<LDFBaseData*> m_NetworkSettings;

	NiPoint3 m_DefaultPosition;
	NiQuaternion m_DefaultRotation;
	float m_Scale;

	Spawner* m_Spawner;
	LWOOBJID m_SpawnerID;

	bool m_HasSpawnerNodeID;
	uint32_t m_SpawnerNodeID;

	Character* m_Character;

	Entity* m_ParentEntity; //For spawners and the like
	std::vector<Entity*> m_ChildEntities;
	eGameMasterLevel m_GMLevel;
	std::vector<std::string> m_Groups;
	uint16_t m_NetworkID;
	std::vector<std::function<void()>> m_DieCallbacks;
	std::vector<std::function<void(Entity*)>> m_PhantomCollisionCallbacks;

	std::unordered_map<eReplicaComponentType, ComponentPtr> m_Components;
	std::vector<std::unique_ptr<EntityTimer>> m_Timers;
	std::vector<std::unique_ptr<EntityTimer>> m_PendingTimers;
	std::vector<std::unique_ptr<EntityCallbackTimer>> m_CallbackTimers;

	bool m_ShouldDestroyAfterUpdate;

	LWOOBJID m_OwnerOverride;

	Entity* m_ScheduleKiller;

	bool m_PlayerIsReadyForUpdates;

	bool m_IsGhostingCandidate;

	int8_t m_Observers;

	bool m_IsParentChildDirty;

	/*
	 * Collision
	 */
	std::vector<LWOOBJID> m_TargetsInPhantom;

	static const std::vector<ComponentWhitelist> m_ComponentWhitelists;
};

#include "Entity.tcc"

#endif  //!__ENTITY__H__