RandomMovementGenerator.cpp

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/*
 * 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/>.
 */
 
#include "RandomMovementGenerator.h"
#include "Creature.h"
#include "CreatureAI.h"
#include "MoveSpline.h"
#include "MoveSplineInit.h"
#include "MovementDefines.h"
#include "PathGenerator.h"
#include "Player.h"
#include "Random.h"
 
template<class T>
RandomMovementGenerator<T>::RandomMovementGenerator(float distance, Optional<Milliseconds> duration, Optional<float> speed,
    MovementWalkRunSpeedSelectionMode speedSelectionMode,
    Scripting::v2::ActionResultSetter<MovementStopReason>&& scriptResult /*= {}*/)
    : _timer(0), _speed(speed), _speedSelectionMode(speedSelectionMode), _wanderDistance(distance), _wanderSteps(0)
{
    this->Priority = MOTION_PRIORITY_NORMAL;
    this->Flags = MOVEMENTGENERATOR_FLAG_INITIALIZATION_PENDING;
    this->BaseUnitState = UNIT_STATE_ROAMING;
    this->ScriptResult = std::move(scriptResult);
    if (duration)
        _duration.emplace(*duration);
}
 
template<class T>
MovementGeneratorType RandomMovementGenerator<T>::GetMovementGeneratorType() const
{
    return RANDOM_MOTION_TYPE;
}
 
template<class T>
void RandomMovementGenerator<T>::Pause(uint32 timer)
{
    if (timer)
    {
        this->AddFlag(MOVEMENTGENERATOR_FLAG_TIMED_PAUSED);
        _timer.Reset(timer);
        this->RemoveFlag(MOVEMENTGENERATOR_FLAG_PAUSED);
    }
    else
    {
        this->AddFlag(MOVEMENTGENERATOR_FLAG_PAUSED);
        this->RemoveFlag(MOVEMENTGENERATOR_FLAG_TIMED_PAUSED);
    }
}
 
template<class T>
void RandomMovementGenerator<T>::Resume(uint32 overrideTimer)
{
    if (overrideTimer)
        _timer.Reset(overrideTimer);
 
    this->RemoveFlag(MOVEMENTGENERATOR_FLAG_PAUSED);
}
 
template<class T>
bool RandomMovementGenerator<T>::DoInitialize(T* owner)
{
    this->RemoveFlag(MOVEMENTGENERATOR_FLAG_INITIALIZATION_PENDING | MOVEMENTGENERATOR_FLAG_TRANSITORY | MOVEMENTGENERATOR_FLAG_DEACTIVATED | MOVEMENTGENERATOR_FLAG_TIMED_PAUSED);
    this->AddFlag(MOVEMENTGENERATOR_FLAG_INITIALIZED);
 
    if (!owner->IsAlive())
        return false;
 
    _reference = owner->GetPosition();
 
    // Retail seems to let a creature walk 2 up to 10 splines before triggering a pause
    _wanderSteps = urand(2, 10);
 
    _timer.Reset(0);
    _path = nullptr;
    return true;
}
 
template<class T>
bool RandomMovementGenerator<T>::DoReset(T* owner)
{
    this->RemoveFlag(MOVEMENTGENERATOR_FLAG_TRANSITORY | MOVEMENTGENERATOR_FLAG_DEACTIVATED);
 
    return DoInitialize(owner);
}
 
template<class T>
void RandomMovementGenerator<T>::SetRandomLocation(T* owner)
{
    if (owner->HasUnitState(UNIT_STATE_NOT_MOVE | UNIT_STATE_LOST_CONTROL) || owner->IsMovementPreventedByCasting())
    {
        this->AddFlag(MOVEMENTGENERATOR_FLAG_INTERRUPTED);
        owner->StopMoving();
        _path = nullptr;
        return;
    }
 
    Position position(_reference);
    float distance = _wanderDistance > 0.1f ? frand(0.1f, _wanderDistance) : _wanderDistance;
    float angle = frand(0.f, static_cast<float>(M_PI * 2));
    owner->MovePositionToFirstCollision(position, distance, angle);
 
    // Check if the destination is in LOS
    if (!owner->IsWithinLOS(position.GetPositionX(), position.GetPositionY(), position.GetPositionZ()))
    {
        // Retry later on
        _timer.Reset(200);
        return;
    }
 
    if (!_path)
    {
        _path = std::make_unique<PathGenerator>(owner);
        _path->SetPathLengthLimit(30.0f);
    }
 
    bool result = _path->CalculatePath(position.GetPositionX(), position.GetPositionY(), position.GetPositionZ());
    // PATHFIND_FARFROMPOLY shouldn't be checked as creatures in water are most likely far from poly
    if (!result || (_path->GetPathType() & PATHFIND_NOPATH)
                || (_path->GetPathType() & PATHFIND_SHORTCUT)
                /*|| (_path->GetPathType() & PATHFIND_FARFROMPOLY)*/)
    {
        _timer.Reset(100);
        return;
    }
 
    if (_path->GetPathLength() < 0.1f)
    {
        // the path is too short for the spline system to be accepted. Let's try again soon.
        _timer.Reset(500);
        return;
    }
 
    this->RemoveFlag(MOVEMENTGENERATOR_FLAG_TRANSITORY | MOVEMENTGENERATOR_FLAG_TIMED_PAUSED);
 
    owner->AddUnitState(UNIT_STATE_ROAMING_MOVE);
 
    Movement::MoveSplineInit init(owner);
    init.MovebyPath(_path->GetPath());
 
    switch (_speedSelectionMode)
    {
        case MovementWalkRunSpeedSelectionMode::Default:
            break;
        case MovementWalkRunSpeedSelectionMode::ForceRun:
            init.SetWalk(false);
            break;
        case MovementWalkRunSpeedSelectionMode::ForceWalk:
            init.SetWalk(true);
            break;
        default:
            break;
    }
 
    if (_speed)
        init.SetVelocity(*_speed);
 
    int32 splineDuration = init.Launch();
 
    --_wanderSteps;
    if (_wanderSteps) // Creature has yet to do steps before pausing
        _timer.Reset(splineDuration);
    else
    {
        // Creature has made all its steps, time for a little break
        _timer.Reset(splineDuration + urand(4, 10) * IN_MILLISECONDS); // Retails seems to use rounded numbers so we do as well
        _wanderSteps = urand(2, 10);
    }
 
    // Call for creature group update
    if constexpr (std::is_base_of_v<Creature, T>)
        owner->SignalFormationMovement();
}
 
template<class T>
bool RandomMovementGenerator<T>::DoUpdate(T* owner, uint32 diff)
{
    if (!owner->IsAlive())
        return true;
 
    if (this->HasFlag(MOVEMENTGENERATOR_FLAG_FINALIZED | MOVEMENTGENERATOR_FLAG_PAUSED))
        return true;
 
    if (_duration)
    {
        _duration->Update(diff);
        if (_duration->Passed())
        {
            this->RemoveFlag(MOVEMENTGENERATOR_FLAG_TRANSITORY);
            this->AddFlag(MOVEMENTGENERATOR_FLAG_INFORM_ENABLED);
            return false;
        }
    }
 
    if (owner->HasUnitState(UNIT_STATE_NOT_MOVE) || owner->IsMovementPreventedByCasting())
    {
        this->AddFlag(MOVEMENTGENERATOR_FLAG_INTERRUPTED);
        owner->StopMoving();
        _path = nullptr;
        return true;
    }
    else
        this->RemoveFlag(MOVEMENTGENERATOR_FLAG_INTERRUPTED);
 
    _timer.Update(diff);
    if ((this->HasFlag(MOVEMENTGENERATOR_FLAG_SPEED_UPDATE_PENDING) && !owner->movespline->Finalized()) || (_timer.Passed() && owner->movespline->Finalized()))
        SetRandomLocation(owner);
 
    return true;
}
 
template<class T>
void RandomMovementGenerator<T>::DoDeactivate(T* owner)
{
    this->AddFlag(MOVEMENTGENERATOR_FLAG_DEACTIVATED);
    owner->ClearUnitState(UNIT_STATE_ROAMING_MOVE);
}
 
template<class T>
void RandomMovementGenerator<T>::DoFinalize(T* owner, bool active, bool movementInform)
{
    this->AddFlag(MOVEMENTGENERATOR_FLAG_FINALIZED);
    if (active)
    {
        owner->ClearUnitState(UNIT_STATE_ROAMING_MOVE);
        owner->StopMoving();
 
        // TODO: Research if this modification is needed, which most likely isnt
        owner->SetWalk(false);
    }
 
    if (movementInform && this->HasFlag(MOVEMENTGENERATOR_FLAG_INFORM_ENABLED))
    {
        this->SetScriptResult(MovementStopReason::Finished);
        if constexpr (std::is_base_of_v<Creature, T>)
            if (owner->IsAIEnabled())
                owner->AI()->MovementInform(RANDOM_MOTION_TYPE, 0);
    }
}
 
MovementGenerator* RandomMovementFactory::Create(Unit* object) const
{
    Creature* owner = object->ToCreature();
    MovementWalkRunSpeedSelectionMode speedSelectionMode = MovementWalkRunSpeedSelectionMode::Default;
    switch (owner->GetMovementTemplate().GetRandom())
    {
        case CreatureRandomMovementType::Walk:
            speedSelectionMode = MovementWalkRunSpeedSelectionMode::ForceWalk;
            break;
        case CreatureRandomMovementType::CanRun:
            break;
        case CreatureRandomMovementType::AlwaysRun:
            speedSelectionMode = MovementWalkRunSpeedSelectionMode::ForceRun;
            break;
        default:
            break;
    }
 
    return new RandomMovementGenerator<Creature>(object->ToCreature()->GetWanderDistance(), {}, {}, speedSelectionMode);
}
 
template class RandomMovementGenerator<Creature>;
template class RandomMovementGenerator<Player>;