// * This file is part of the COLOBOT source code
// * Copyright (C) 2001-2008, Daniel ROUX & EPSITEC SA, www.epsitec.ch
// * Copyright (C) 2012 Polish Portal of Colobot (PPC)
// *
// * 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://www.gnu.org/licenses/.


#include "object/auto/autoflag.h"

#include "math/geometry.h"
#include "graphics/engine/terrain.h"

#include <stdio.h>



#define ADJUST_ANGLE    false       // true -> adjusts the angles of the members


#if ADJUST_ANGLE
static float g_flag1 = 6.00f;
static float g_flag2 = 0.10f;
static float g_flag3 = 2.00f;
#endif


// Object's constructor.

CAutoFlag::CAutoFlag(CObject* object) : CAuto(object)
{
    Init();
}

// Object's destructor.

CAutoFlag::~CAutoFlag()
{
}


// Destroys the object.

void CAutoFlag::DeleteObject(bool bAll)
{
    CAuto::DeleteObject(bAll);
}


// Initialize the object.

void CAutoFlag::Init()
{
    Math::Vector    wind;
    float       angle;

    m_time = 0.0f;
    m_param = 0;
    m_progress = 0.0f;

    wind = m_terrain->GetWind();
    angle = Math::RotateAngle(wind.x, -wind.z);
    m_object->SetAngleY(0, angle);  // directs the flag in the wind

    m_strong = wind.Length();
}


// Beginning of an action (1 = shakes).

void CAutoFlag::Start(int param)
{
    if ( m_param == 0 )
    {
        m_param = param;
        m_progress = 0.0f;
    }
}


// Management of an event.

bool CAutoFlag::EventProcess(const Event &event)
{
    float   angle;
    int     i;

    CAuto::EventProcess(event);

#if ADJUST_ANGLE
    if ( event.type == EVENT_KEYDOWN )
    {
        if ( event.param == 'E' )  g_flag1 += 0.1f;
        if ( event.param == 'D' )  g_flag1 -= 0.1f;
        if ( event.param == 'R' )  g_flag2 += 0.1f;
        if ( event.param == 'F' )  g_flag2 -= 0.1f;
        if ( event.param == 'T' )  g_flag3 += 0.1f;
        if ( event.param == 'G' )  g_flag3 -= 0.1f;
    }
#endif

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

    if ( m_param == 1 )  // shakes?
    {
        m_progress += event.rTime*(1.0f/2.0f);
        if ( m_progress < 1.0f )
        {
            angle = sinf(m_progress*Math::PI*8.0f)*0.3f*(1.0f-m_progress);
            m_object->SetAngleX(0, angle);
            angle = sinf(m_progress*Math::PI*4.0f)*0.3f*(1.0f-m_progress);
            m_object->SetAngleZ(0, angle);
        }
        else
        {
            m_object->SetAngleX(0, 0.0f);
            m_object->SetAngleZ(0, 0.0f);
            m_param = 0;
            m_progress = 0.0f;
        }
    }

    if ( m_strong == 0.0f )  return true;  // no wind?

    for ( i=0 ; i<4 ; i++ )
    {
#if ADJUST_ANGLE
        angle = sinf(m_time*g_flag1+i*2.0f)*((i+g_flag3)*g_flag2);
#else
        angle = sinf(m_time*6.0f+i*2.0f)*((i+2.0f)*0.1f);
#endif
        m_object->SetAngleY(1+i, angle);
    }

#if ADJUST_ANGLE
    char s[100];
    sprintf(s, "a=%.2f b=%.2f c=%.2f", g_flag1, g_flag2, g_flag3);
    m_engine->SetInfoText(4, s);
#endif
    return true;
}


// Returns an error due the state of the automation

Error CAutoFlag::GetError()
{
    return ERR_OK;
}