ShipAICmd.h

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// Copyright © 2008-2021 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#ifndef _SHIPAICMD_H
#define _SHIPAICMD_H
 
#include "GameSaveError.h"
#include "JsonFwd.h"
 
#include "DynamicBody.h"
#include "FrameId.h"
#include "FixedGuns.h"
#include "ship/Propulsion.h"
 
class Ship;
class Space;
class SpaceStation;
 
class AICommand {
public:
    // This enum is solely to make the serialization work
    enum CmdName { // <enum scope='AICommand::CmdName' name=ShipAICmdName public>
        CMD_NONE,
        CMD_DOCK,
        CMD_FLYTO,
        CMD_FLYAROUND,
        CMD_KILL,
        CMD_KAMIKAZE,
        CMD_HOLDPOSITION,
        CMD_FORMATION
    };
 
    AICommand(DynamicBody *dBody, CmdName name) :
        m_dBody(dBody),
        m_cmdName(name)
    {
        m_dBody->AIMessage(DynamicBody::AIERROR_NONE);
    }
    virtual ~AICommand() {}
 
    virtual bool TimeStepUpdate() = 0;
    bool ProcessChild(); // returns false if child is active
    virtual void GetStatusText(char *str)
    {
        if (m_child)
            m_child->GetStatusText(str);
        else
            strcpy(str, "AI state unknown");
    }
 
    // Serialisation functions
    static AICommand *LoadFromJson(const Json &jsonObj);
    AICommand(const Json &jsonObj, CmdName name);
    virtual void SaveToJson(Json &jsonObj);
    virtual void PostLoadFixup(Space *space);
 
    // Signal functions
    virtual void OnDeleted(const Body *body)
    {
        if (m_child) m_child->OnDeleted(body);
    }
 
    CmdName GetType() const { return m_cmdName; }
 
protected:
    DynamicBody *m_dBody;
    RefCountedPtr<Propulsion> m_prop;
    RefCountedPtr<FixedGuns> m_fguns;
 
    std::unique_ptr<AICommand> m_child;
    bool m_is_flyto = false;
    CmdName m_cmdName;
 
    int m_dBodyIndex; // deserialisation
};
 
class AICmdDock : public AICommand {
public:
    virtual bool TimeStepUpdate();
    AICmdDock(DynamicBody *dBody, SpaceStation *target);
 
    virtual void GetStatusText(char *str);
    virtual void SaveToJson(Json &jsonObj);
    AICmdDock(const Json &jsonObj);
    virtual void PostLoadFixup(Space *space);
 
    virtual void OnDeleted(const Body *body);
 
private:
    enum EDockingStates {
        eDockGetDataStart = 0, // 0: get data for docking start pos
        eDockFlyToStart = 1, // 1: Fly to docking start pos
        eDockGetDataEnd = 2, // 2: get data for docking end pos
        eDockFlyToEnd = 3, // 3: Fly to docking end pos
        eDockingComplete = 4,
        eInvalidDockingStage = 5
    };
 
    SpaceStation *m_target;
    vector3d m_dockpos; // offset in target's frame
    vector3d m_dockdir;
    vector3d m_dockupdir;
    EDockingStates m_state; // see TimeStepUpdate()
    int m_targetIndex; // used during deserialisation
 
    void IncrementState()
    {
        switch (m_state) {
        case eDockGetDataStart: m_state = eDockFlyToStart; break;
        case eDockFlyToStart: m_state = eDockGetDataEnd; break;
        case eDockGetDataEnd: m_state = eDockFlyToEnd; break;
        case eDockFlyToEnd: m_state = eDockingComplete; break;
        case eDockingComplete: m_state = eInvalidDockingStage; break;
        case eInvalidDockingStage: break;
        }
    }
};
 
class AICmdFlyTo : public AICommand {
public:
    virtual bool TimeStepUpdate();
    AICmdFlyTo(DynamicBody *dBody, FrameId targframeId, const vector3d &posoff, double endvel, bool tangent);
    AICmdFlyTo(DynamicBody *dBody, Body *target);
 
    virtual void GetStatusText(char *str);
    virtual void SaveToJson(Json &jsonObj);
    AICmdFlyTo(const Json &jsonObj);
    virtual void PostLoadFixup(Space *space);
 
    virtual void OnDeleted(const Body *body);
 
private:
    Body *m_target; // target for vicinity. Either this or targframe is 0
    double m_dist; // vicinity distance
    FrameId m_targframeId; // target frame for waypoint
    vector3d m_posoff; // offset in target frame
    double m_endvel; // target speed in direction of motion at end of path, positive only
    bool m_tangent; // true if path is to a tangent of the target frame's body
    int m_state;
 
    bool m_lockhead;
    int m_targetIndex; // used during deserialisation
    vector3d m_reldir; // target direction relative to ship at last frame change
    FrameId m_frameId; // last frame of ship
};
 
class AICmdFlyAround : public AICommand {
public:
    virtual bool TimeStepUpdate();
    AICmdFlyAround(DynamicBody *dBody, Body *obstructor, double relalt, int mode = 2);
    AICmdFlyAround(DynamicBody *dBody, Body *obstructor, double alt, double vel, int mode = 1);
 
    virtual void GetStatusText(char *str);
    virtual void SaveToJson(Json &jsonObj);
    AICmdFlyAround(const Json &jsonObj);
    virtual void PostLoadFixup(Space *space);
    virtual void OnDeleted(const Body *body)
    {
        AICommand::OnDeleted(body);
        // check against obstructor?
    }
    void SetTargPos(const vector3d &targpos)
    {
        m_targpos = targpos;
        m_targmode = 0;
    }
 
protected:
    void Setup(Body *obstructor, double alt, double vel, int mode);
    double MaxVel(double targdist, double targalt);
 
private:
    Body *m_obstructor; // body to fly around
    int m_obstructorIndex; // deserialisation
    double m_alt, m_vel;
    int m_targmode; // 0 targpos termination, 1 infinite, 2+ orbital termination
    vector3d m_targpos; // target position in ship space
};
 
class AICmdKill : public AICommand {
public:
    virtual bool TimeStepUpdate();
    AICmdKill(DynamicBody *dBody, Ship *target);
    AICmdKill(const Json &jsonObj);
 
    ~AICmdKill();
 
    // don't actually need to save all this crap
    virtual void SaveToJson(Json &jsonObj);
    void PostLoadFixup(Space *space);
 
    virtual void OnDeleted(const Body *body);
 
private:
    Ship *m_target;
    double m_leadTime, m_evadeTime, m_closeTime;
    vector3d m_leadOffset, m_leadDrift, m_lastVel;
    int m_targetIndex; // used during deserialisation
};
 
class AICmdKamikaze : public AICommand {
public:
    virtual bool TimeStepUpdate();
    AICmdKamikaze(DynamicBody *dBody, Body *target);
 
    virtual void SaveToJson(Json &jsonObj);
    AICmdKamikaze(const Json &jsonObj);
    virtual void PostLoadFixup(Space *space);
 
    virtual void OnDeleted(const Body *body);
 
private:
    Body *m_target;
    int m_targetIndex; // used during deserialisation
};
 
class AICmdHoldPosition : public AICommand {
public:
    virtual bool TimeStepUpdate();
    AICmdHoldPosition(DynamicBody *dBody);
    AICmdHoldPosition(const Json &jsonObj);
};
 
class AICmdFormation : public AICommand {
public:
    virtual bool TimeStepUpdate();
    AICmdFormation(DynamicBody *dBody, DynamicBody *target, const vector3d &posoff);
 
    void GetStatusText(char *str);
    virtual void SaveToJson(Json &jsonObj);
    AICmdFormation(const Json &jsonObj);
    virtual void PostLoadFixup(Space *space);
 
    virtual void OnDeleted(const Body *body);
 
private:
    DynamicBody *m_target; // target frame for waypoint
    vector3d m_posoff; // offset in target frame
 
    int m_targetIndex; // used during deserialisation
};
 
#endif /* _SHIPAICMD_H */