/*
 * This file is part of the Colobot: Gold Edition source code
 * Copyright (C) 2001-2014, Daniel Roux, EPSITEC SA & TerranovaTeam
 * http://epsiteс.ch; http://colobot.info; http://github.com/colobot
 *
 * 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 3 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://gnu.org/licenses
 */


#include "object/task/taskgungoal.h"

#include "object/object.h"




// Object's constructor.

CTaskGunGoal::CTaskGunGoal(CObject* object) : CTask(object)
{
    m_aimImpossible = false;
}

// Object's destructor.

CTaskGunGoal::~CTaskGunGoal()
{
}


// Management of an event.

bool CTaskGunGoal::EventProcess(const Event &event)
{
    float       dir;

    if ( m_engine->GetPause() )  return true;
    if ( event.type != EVENT_FRAME )  return true;

    m_progress += event.rTime*m_speed;

    if ( m_progress < 1.0f )
    {
        dir = m_initialDirV + (m_finalDirV-m_initialDirV)*m_progress;
    }
    else
    {
        dir = m_finalDirV;
    }
    m_object->SetGunGoalV(dir);

    if ( m_progress < 1.0f )
    {
        dir = m_initialDirH + (m_finalDirH-m_initialDirH)*m_progress;
    }
    else
    {
        dir = m_finalDirH;
    }
    m_object->SetGunGoalH(dir);

    return true;
}


// Assigns the goal was achieved.

Error CTaskGunGoal::Start(float dirV, float dirH)
{
    float   speedV, speedH;
    int     i;

    m_initialDirV = m_object->GetGunGoalV();
    m_object->SetGunGoalV(dirV);
    m_finalDirV = m_object->GetGunGoalV();  // possible direction
    m_object->SetGunGoalV(m_initialDirV);  // gives initial direction

    if ( m_finalDirV == m_initialDirV )
    {
        speedV = 100.0f;
    }
    else
    {
        speedV = 1.0f/(fabs(m_finalDirV-m_initialDirV)*1.0f);
    }

    m_initialDirH = m_object->GetGunGoalH();
    m_object->SetGunGoalH(dirH);
    m_finalDirH = m_object->GetGunGoalH();  // possible direction
    m_object->SetGunGoalH(m_initialDirH);  // gives initial direction

    if ( m_finalDirH == m_initialDirH )
    {
        speedH = 100.0f;
    }
    else
    {
        speedH = 1.0f/(fabs(m_finalDirH-m_initialDirH)*1.0f);
    }

    m_speed = Math::Min(speedV, speedH);

    if ( m_finalDirV != m_initialDirV ||
         m_finalDirH != m_initialDirH )
    {
        i = m_sound->Play(SOUND_MANIP, m_object->GetPosition(0), 0.3f, 1.5f, true);
        m_sound->AddEnvelope(i, 0.3f, 1.5f, 1.0f/m_speed, SOPER_STOP);
    }

    m_progress = 0.0f;

    // direction was constrainted, hence resulting in impossible move
    if (dirV != m_finalDirV || dirH != m_finalDirH)
    {
        m_aimImpossible = true;
    }

    return ERR_OK;
}

// Indicates whether the action is finished.

Error CTaskGunGoal::IsEnded()
{
    if ( m_engine->GetPause() )  return ERR_CONTINUE;

    if ( m_initialDirV == m_finalDirV &&
         m_initialDirH == m_finalDirH )
    {
        if ( m_aimImpossible )
            return ERR_AIM_IMPOSSIBLE;
        else
            return ERR_STOP;
    }

    if ( m_progress < 1.0f ) return ERR_CONTINUE;

    m_object->SetGunGoalV(m_finalDirV);
    m_object->SetGunGoalH(m_finalDirH);
    Abort();

    if ( m_aimImpossible )
    {
        return ERR_AIM_IMPOSSIBLE;
    }

    return ERR_STOP;
}

// Suddenly ends the current action.

bool CTaskGunGoal::Abort()
{
    return true;
}