/*
 *   ORXONOX - the hottest 3D action shooter ever to exist
 *                    > www.orxonox.net <
 *
 *
 *   License notice:
 *
 *   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, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 *   Author:
 *      Gani Aliguzhinov
 *   Co-authors:
 *      ...
 *
 */

#include "WingmanController.h"


namespace orxonox
{

    RegisterClass(WingmanController);
    
    //ActionpointController contains all common functionality of AI Controllers
    WingmanController::WingmanController(Context* context) : ActionpointController(context)
    {
        RegisterObject(WingmanController);
        this->myLeader_ = nullptr;
        this->bFirstAction_ = true;

    }

    WingmanController::~WingmanController()
    {
        for (WorldEntity* actionpoint : this->actionpoints_)
        {
            if (actionpoint)
                actionpoint->destroy();
        }
        this->parsedActionpoints_.clear();
        this->actionpoints_.clear();
    }
    
    //----action for hard calculations----
    void WingmanController::action()
    {
        if (!this || !this->getControllableEntity() || !this->isActive())
            return;
        //----If no leader, find one----
        if (!this->myLeader_)
        {
            ActionpointController* newLeader = (findNewLeader());
            if (!this || !this->getControllableEntity())
                return;

            this->myLeader_ = newLeader;
            if (this->myLeader_)
            {
               
            }
        }
        //----If have leader, he will deal with logic----
        else
        {

        }
        if (!this->myLeader_)
        {
            ActionpointController::action();
        }
        else if (this->myLeader_)
        {
            if (this->myLeader_->bKeepFormation_ || !(this->myLeader_->getAction() == Action::FIGHT 
                || this->myLeader_->getAction() == Action::FIGHTALL
                || this->myLeader_->getAction() == Action::ATTACK))
            {
                this->keepFormation();
            }
            else if (!this->myLeader_->bKeepFormation_)
            {
                if (!this || !this->getControllableEntity())
                    return;

                if (!this->hasTarget())
                {
                    this->setTarget(this->myLeader_->getTarget());
                }
                
            }
        }
    }
     
   
    Vector3 WingmanController::getFormationPosition ()
    {
        this->setFormationMode( this->myLeader_->getFormationMode() );
        this->spread_ = this->myLeader_->getSpread();
        if (this->myLeader_->getIdentifier()->getName() == "DivisionController")
        {
            switch (this->formationMode_){
                case FormationMode::WALL:
                    return Vector3 (2.0f*this->spread_, 0, 0 - 1.0f*this->tolerance_);
                case FormationMode::FINGER4: 
                    return Vector3 (2.0f*this->spread_, 0, this->spread_ - 1.0f*this->tolerance_);
                case FormationMode::DIAMOND: 
                    return Vector3 (2.0f*this->spread_, 0, this->spread_ - 1.0f*this->tolerance_);
                default:
                    return Vector3::ZERO;
            }
        }
        else
        {
            switch (this->formationMode_){
                case FormationMode::WALL:
                    return Vector3 (-2.0f*this->spread_, 0, 0 - 1.0f*this->tolerance_);
                case FormationMode::FINGER4: 
                    return Vector3 (-2.0f*this->spread_, 0, this->spread_ - 1.0f*this->tolerance_);
                case FormationMode::DIAMOND: 
                    return Vector3 (2.0f*this->spread_, -1.0f*this->spread_, 0 - 1.0f*this->tolerance_);
                default:
                    return Vector3::ZERO;
            }
        }
    }
    void WingmanController::keepFormation()
    {
        this->bKeepFormation_ = true;
        ControllableEntity* leaderEntity = this->myLeader_->getControllableEntity();
        Vector3 targetRelativePosition = this->getFormationPosition();
        if (!leaderEntity)
            return;
        FlyingController::keepFormation (leaderEntity, targetRelativePosition);
    }
    //----POST: closest leader that is ready to take a new wingman is returned----
    ActionpointController* WingmanController::findNewLeader()
    {

        if (!this->getControllableEntity())
            return nullptr;

        //----vars for finding the closest leader----
        ActionpointController* closestLeader = nullptr;
        float minDistance =  std::numeric_limits<float>::infinity();
        Gametype* gt = this->getGametype();

        for (ActionpointController* controller : ObjectList<ActionpointController>())
        {
            //----0ptr or not a leader or dead?----
            if (!controller ||
                (controller->getIdentifier()->getName() != "SectionController" && controller->getIdentifier()->getName() != "DivisionController") ||
                !(controller->getControllableEntity()))
                continue;
            
            //----same team?----
            if ( !CommonController::sameTeam (this->getControllableEntity(), controller->getControllableEntity(), gt) )
                continue;
            
            //----check distance----
            float distance = CommonController::distance (controller->getControllableEntity(), this->getControllableEntity());
            if (distance < minDistance && !(controller->hasWingman()))
            {
                closestLeader = controller;
                minDistance = distance;
            }
        }
        if (closestLeader)
        {
            //----Racing conditions----
            /*TODO: racing condition check is wrong and redundant, as there is no multithreading here, ticks get called one after another,
            so it can be simplified to a check of whether leader got a wingman*/
            if (closestLeader->setWingman(orxonox_cast<ActionpointController*>(this)))
            {
                return closestLeader;
            }
        }
        return nullptr;
    }

}