path: root/src/Mobs/Monster.h

#pragma once

#include "../Entities/Pawn.h"
#include "MonsterTypes.h"
#include "PathFinder.h"


class cItem;
class cClientHandle;


//Behavior fwds
class cPassiveMonster;
class cBehaviorAggressive;
class cBehaviorBreeder;
class cBehaviorChaser;
class cBehaviorStriker;
class cBehaviorWanderer;

// tolua_begin
class cMonster :
    public cPawn
{
    typedef cPawn super;
public:

    enum eFamily
    {
        mfHostile  = 0,  // Spider, Zombies ...
        mfPassive  = 1,  // Cows, Pigs
        mfAmbient  = 2,  // Bats
        mfWater    = 3,  // Squid, Guardian

        mfNoSpawn,
        mfUnhandled,  // Nothing. Be sure this is the last and the others are in order
    } ;

    // tolua_end

    enum MState{ATTACKING, IDLE, CHASING, ESCAPING} m_EMState;
    enum MPersonality{PASSIVE, AGGRESSIVE, COWARDLY} m_EMPersonality;

    /** Creates the mob object.
    If a_ConfigName is not empty, the configuration is loaded using GetMonsterConfig()
    a_MobType is the type of the mob (also used in the protocol ( http://wiki.vg/Entities#Mobs 2012_12_22))
    a_SoundHurt and a_SoundDeath are assigned into m_SoundHurt and m_SoundDeath, respectively
    */
    cMonster(const AString & a_ConfigName, eMonsterType a_MobType, const AString & a_SoundHurt, const AString & a_SoundDeath, double a_Width, double a_Height);

    virtual ~cMonster() override;

    virtual void Destroy(bool a_ShouldBroadcast = true) override;

    virtual void Destroyed() override;

    CLASS_PROTODEF(cMonster)

    virtual void SpawnOn(cClientHandle & a_ClientHandle) override;

    virtual void Tick(std::chrono::milliseconds a_Dt, cChunk & a_Chunk) override;

    virtual bool DoTakeDamage(TakeDamageInfo & a_TDI) override;

    virtual void KilledBy(TakeDamageInfo & a_TDI) override;

    virtual void OnRightClicked(cPlayer & a_Player) override;

    virtual void HandleFalling(void) override;

    /** Engage pathfinder and tell it to calculate a path to a given position, and move the mob accordingly
    Currently, the mob will only start moving to a new position after the position it is currently going to is reached. */
    virtual void MoveToPosition(const Vector3d & a_Position);  // tolua_export

    // tolua_begin
    eMonsterType GetMobType(void) const { return m_MobType; }
    eFamily GetMobFamily(void) const;
    // tolua_end

    virtual void CheckEventSeePlayer(cChunk & a_Chunk);
    virtual void EventSeePlayer(cPlayer * a_Player, cChunk & a_Chunk);

    // tolua_begin

    /** Returns whether the mob can be leashed. */
    bool CanBeLeashed() const { return m_CanBeLeashed; }

    /** Sets whether the mob can be leashed, for extensibility in plugins */
    void SetCanBeLeashed(bool a_CanBeLeashed) { m_CanBeLeashed = a_CanBeLeashed; }

    /** Returns whether the monster is leashed to an entity. */
    bool IsLeashed() const { return (m_LeashedTo != nullptr); }

    /** Leash the monster to an entity. */
    void LeashTo(cEntity * a_Entity, bool a_ShouldBroadcast = true);

    /** Unleash the monster. Overload for the Unleash(bool, bool) function for plugins */
    void Unleash(bool a_ShouldDropLeashPickup);

    /** Returns the entity to where this mob is leashed, returns nullptr if it's not leashed */
    cEntity * GetLeashedTo() const { return m_LeashedTo; }

    // tolua_end

    /** Unleash the monster. */
    void Unleash(bool a_ShouldDropLeashPickup, bool a_ShouldBroadcast);

    /** Sets entity position to where is leashed this mob */
    void SetLeashToPos(Vector3d * pos) { m_LeashToPos = std::unique_ptr<Vector3d>(pos); }

    /** Gets entity position to where mob should be leashed */
    Vector3d * GetLeashToPos() const { return m_LeashToPos.get(); }

    /** Reads the monster configuration for the specified monster name and assigns it to this object. */
    void GetMonsterConfig(const AString & a_Name);

    /** Returns whether this mob is undead (skeleton, zombie, etc.) */
    virtual bool IsUndead(void);

    virtual void EventLosePlayer(void);
    virtual void CheckEventLostPlayer(void);

    virtual void InStateIdle    (std::chrono::milliseconds a_Dt, cChunk & a_Chunk);
    virtual void InStateChasing (std::chrono::milliseconds a_Dt, cChunk & a_Chunk);
    virtual void InStateEscaping(std::chrono::milliseconds a_Dt, cChunk & a_Chunk);

    int GetAttackRate() { return static_cast<int>(m_AttackRate); }
    void SetAttackRate(float a_AttackRate) { m_AttackRate = a_AttackRate; }
    void SetAttackRange(int a_AttackRange) { m_AttackRange = a_AttackRange; }
    void SetAttackDamage(int a_AttackDamage) { m_AttackDamage = a_AttackDamage; }
    void SetSightDistance(int a_SightDistance) { m_SightDistance = a_SightDistance; }
    int GetSightDistance() { return m_SightDistance; }

    float GetDropChanceWeapon() { return m_DropChanceWeapon; }
    float GetDropChanceHelmet() { return m_DropChanceHelmet; }
    float GetDropChanceChestplate() { return m_DropChanceChestplate; }
    float GetDropChanceLeggings() { return m_DropChanceLeggings; }
    float GetDropChanceBoots() { return m_DropChanceBoots; }
    bool CanPickUpLoot() { return m_CanPickUpLoot; }
    void SetDropChanceWeapon(float a_DropChanceWeapon) { m_DropChanceWeapon = a_DropChanceWeapon; }
    void SetDropChanceHelmet(float a_DropChanceHelmet) { m_DropChanceHelmet = a_DropChanceHelmet; }
    void SetDropChanceChestplate(float a_DropChanceChestplate) { m_DropChanceChestplate = a_DropChanceChestplate; }
    void SetDropChanceLeggings(float a_DropChanceLeggings) { m_DropChanceLeggings = a_DropChanceLeggings; }
    void SetDropChanceBoots(float a_DropChanceBoots) { m_DropChanceBoots = a_DropChanceBoots; }
    void SetCanPickUpLoot(bool a_CanPickUpLoot) { m_CanPickUpLoot = a_CanPickUpLoot; }
    void ResetAttackCooldown();

    /** Sets whether the mob burns in daylight. Only evaluated at next burn-decision tick */
    void SetBurnsInDaylight(bool a_BurnsInDaylight) { m_BurnsInDaylight = a_BurnsInDaylight; }

    double GetRelativeWalkSpeed(void) const { return m_RelativeWalkSpeed; }  // tolua_export
    void SetRelativeWalkSpeed(double a_WalkSpeed) { m_RelativeWalkSpeed = a_WalkSpeed; }  // tolua_export

    // Overridables to handle ageable mobs
    virtual bool IsTame    (void) const { return false; }
    virtual bool IsSitting (void) const { return false; }

    // tolua_begin
    bool IsBaby (void) const { return m_Age < 0; }
    int GetAge (void) const { return m_Age; }
    void SetAge(int a_Age)  { m_Age = a_Age; }
    // tolua_end


    // tolua_begin

    /** Returns true if the monster has a custom name. */
    bool HasCustomName(void) const { return !m_CustomName.empty(); }

    /** Gets the custom name of the monster. If no custom name is set, the function returns an empty string. */
    const AString & GetCustomName(void) const { return m_CustomName; }

    /** Sets the custom name of the monster. You see the name over the monster.
    If you want to disable the custom name, simply set an empty string. */
    void SetCustomName(const AString & a_CustomName);

    /** Is the custom name of this monster always visible? If not, you only see the name when you sight the mob. */
    bool IsCustomNameAlwaysVisible(void) const { return m_CustomNameAlwaysVisible; }

    /** Sets the custom name visiblity of this monster.
    If it's false, you only see the name when you sight the mob. If it's true, you always see the custom name. */
    void SetCustomNameAlwaysVisible(bool a_CustomNameAlwaysVisible);

    /** Translates MobType enum to a string, empty string if unknown */
    static AString MobTypeToString(eMonsterType a_MobType);

    /** Translates MobType enum to the vanilla name of the mob, empty string if unknown. */
    static AString MobTypeToVanillaName(eMonsterType a_MobType);

    /** Translates MobType string to the enum, mtInvalidType if not recognized */
    static eMonsterType StringToMobType(const AString & a_MobTypeName);

    /** Returns the mob family based on the type */
    static eFamily FamilyFromType(eMonsterType a_MobType);

    /** Returns the spawn delay (number of game ticks between spawn attempts) for the given mob family */
    static int GetSpawnDelay(cMonster::eFamily a_MobFamily);

    // tolua_end

    /**  Translates the MobType enum to the vanilla nbt name */
    static AString MobTypeToVanillaNBT(eMonsterType a_MobType);

    /** Sets the target that this mob will chase. Pass a nullptr to unset. */
    void SetTarget (cPawn * a_NewTarget);

    /** Unset the target without notifying the target entity. Do not use this, use SetTarget(nullptr) instead.
    This is only used by cPawn internally. */
    void UnsafeUnsetTarget();

    /** Returns the current target. */
    cPawn * GetTarget();

    /** Creates a new object of the specified mob.
    a_MobType is the type of the mob to be created
    Asserts and returns null if mob type is not specified
    */
    static std::unique_ptr<cMonster> NewMonsterFromType(eMonsterType a_MobType);

    /** Returns if this mob last target was a player to avoid destruction on player quit */
    bool WasLastTargetAPlayer() const { return m_WasLastTargetAPlayer; }

    // Behavior getters
    virtual cBehaviorAggressive * GetBehaviorAggressive();
    virtual cBehaviorBreeder * GetBehaviorBreeder();
    virtual const cBehaviorBreeder * GetBehaviorBreeder() const;
    virtual cBehaviorChaser * GetBehaviorChaser();
    virtual cBehaviorStriker * GetBehaviorStriker();
    virtual cBehaviorWanderer * GetBehaviorWanderer();

    // Polymorphic behavior functions ("Skin-specific")
    virtual void InheritFromParents(cPassiveMonster * a_Parent1, cPassiveMonster * a_Parent2);
    virtual void GetFollowedItems(cItems & a_Items);
    virtual void GetBreedingItems(cItems & a_Items);

    cPlayer * GetNearestPlayer();

    protected:

    /** Whether or not m_NearestPlayer is stale. Always true at the beginning of a tick.
    When true, GetNearestPlayer() actually searches for a player, updates m_NearestPlayer, and sets it to false.
    otherwise it returns m_NearestPlayer. This means we only perform 1 search per tick. */
    bool m_NearestPlayerIsStale;
    cPlayer * m_NearestPlayer;

    /** The pathfinder instance handles pathfinding for this monster. */
    cPathFinder m_PathFinder;

    /** Stores if pathfinder is being used - set when final destination is set, and unset when stopped moving to final destination */
    bool m_PathfinderActivated;

    /** Coordinates of the next position that should be reached */
    Vector3d m_NextWayPointPosition;

    /** Coordinates for the ultimate, final destination. */
    Vector3d m_FinalDestination;

    /** Finds the lowest non-air block position (not the highest, as cWorld::GetHeight does)
    If current Y is nonsolid, goes down to try to find a solid block, then returns that + 1
    If current Y is solid, goes up to find first nonsolid block, and returns that.
    If no suitable position is found, returns cChunkDef::Height. */
    int FindFirstNonAirBlockPosition(double a_PosX, double a_PosZ);

    /** Returns if the ultimate, final destination has been reached. */
    bool ReachedFinalDestination(void) { return ((m_FinalDestination - GetPosition()).SqrLength() < WAYPOINT_RADIUS * WAYPOINT_RADIUS); }

    /** Returns whether or not the target is close enough for attack. */
    bool TargetIsInRange(void)
    {
        ASSERT(GetTarget() != nullptr);
        return ((GetTarget()->GetPosition() - GetPosition()).SqrLength() < (m_AttackRange * m_AttackRange));
    }

    /** Returns whether the monster needs to jump to reach a given height. */
    inline bool DoesPosYRequireJump(double a_PosY)
    {
        return (a_PosY > GetPosY() + 0.8);  // Assume that differences up to 0.8 blocks can be walked instead of jumped
    }

    /** Move in a straight line to the next waypoint in the path, will jump if needed. */
    void MoveToWayPoint(cChunk & a_Chunk);

    /** Stops pathfinding. Calls ResetPathFinding and sets m_IsFollowingPath to false */
    void StopMovingToPosition();

    /** Sets the body yaw and head yaw */
    void SetPitchAndYawFromDestination(bool a_IsFollowingPath);

    int m_JumpCoolDown;

    std::chrono::milliseconds m_IdleInterval;
    std::chrono::milliseconds m_DestroyTimer;

    eMonsterType m_MobType;
    AString m_CustomName;
    bool m_CustomNameAlwaysVisible;

    AString m_SoundHurt;
    AString m_SoundDeath;

    float m_AttackRate;
    int m_AttackDamage;
    int m_AttackRange;
    int m_AttackCoolDownTicksLeft;
    int m_SightDistance;

    float m_DropChanceWeapon;
    float m_DropChanceHelmet;
    float m_DropChanceChestplate;
    float m_DropChanceLeggings;
    float m_DropChanceBoots;
    bool m_CanPickUpLoot;
    int m_TicksSinceLastDamaged;  // How many ticks ago we were last damaged by a player?

    void HandleDaylightBurning(cChunk & a_Chunk, bool WouldBurn);
    bool WouldBurnAt(Vector3d a_Location, cChunk & a_Chunk);
    bool m_BurnsInDaylight;
    double m_RelativeWalkSpeed;

    int m_Age;
    int m_AgingTimer;

    bool m_WasLastTargetAPlayer;

    /** Entity leashed to */
    cEntity * m_LeashedTo;

    /** Entity pos where this mob was leashed to. Used when deserializing the chunk in order to make the mob find the leash knot. */
    std::unique_ptr<Vector3d> m_LeashToPos;

    /** Mob has ben leashed or unleashed in current player action. Avoids double actions on horses. */
    bool m_IsLeashActionJustDone;

    /** Determines whether a monster can be leashed */
    bool m_CanBeLeashed;

    /** Adds a random number of a_Item between a_Min and a_Max to itemdrops a_Drops */
    void AddRandomDropItem(cItems & a_Drops, unsigned int a_Min, unsigned int a_Max, short a_Item, short a_ItemHealth = 0);

    /** Adds a item a_Item with the chance of a_Chance (in percent) to itemdrops a_Drops */
    void AddRandomUncommonDropItem(cItems & a_Drops, float a_Chance, short a_Item, short a_ItemHealth = 0);

    /** Adds one rare item out of the list of rare items a_Items modified by the looting level a_LootingLevel(I-III or custom) to the itemdrop a_Drops */
    void AddRandomRareDropItem(cItems & a_Drops, cItems & a_Items, unsigned int a_LootingLevel);

    /** Adds armor that is equipped with the chance saved in m_DropChance[...] (this will be greter than 1 if picked up or 0.085 + (0.01 per LootingLevel) if born with) to the drop */
    void AddRandomArmorDropItem(cItems & a_Drops, unsigned int a_LootingLevel);

    /** Adds weapon that is equipped with the chance saved in m_DropChance[...] (this will be greter than 1 if picked up or 0.085 + (0.01 per LootingLevel) if born with) to the drop */
    void AddRandomWeaponDropItem(cItems & a_Drops, unsigned int a_LootingLevel);

private:
    /** A pointer to the entity this mobile is aiming to reach.
    The validity of this pointer SHALL be guaranteed by the pointee;
    it MUST be reset when the pointee changes worlds or is destroyed. */
    cPawn * m_Target;

    /** Leash calculations inside Tick function */
    void CalcLeashActions();

} ;  // tolua_export