/*
 * This file is part of the Colobot: Gold Edition source code
 * Copyright (C) 2001-2023, Daniel Roux, EPSITEC SA & TerranovaTeam
 * http://epsitec.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 "level/mainmovie.h"

#include "app/app.h"

#include "graphics/engine/engine.h"

#include "level/robotmain.h"

#include "math/geometry.h"

#include "object/object.h"

#include "object/interface/movable_object.h"

#include "object/motion/motionhuman.h"


#include <cstdio>


// Constructor of the application card.

CMainMovie::CMainMovie()
{
    m_engine    = Gfx::CEngine::GetInstancePointer();
    m_main      = CRobotMain::GetInstancePointer();
    m_camera    = m_main->GetCamera();
    m_sound     = CApplication::GetInstancePointer()->GetSound();

    m_progress = 0.0f;
    m_stopType = MM_NONE;
    m_type = MM_NONE;
    m_speed = 0.0f;

    Flush();
}

// Destructor of the application card.

CMainMovie::~CMainMovie()
{
}


// Stops the current movie.

void CMainMovie::Flush()
{
    m_type = MM_NONE;
}


// Start of a film.

bool CMainMovie::Start(MainMovieType type, float time)
{
    glm::vec3    pos{ 0, 0, 0 };
    CObject*    pObj;

    m_type = type;
    m_speed = 1.0f/time;
    m_progress = 0.0f;

    if ( m_type == MM_SATCOMopen )
    {
        pObj = m_main->SearchHuman();
        if ( pObj == nullptr )
        {
            m_type = MM_NONE;  // it's over!
            return true;
        }

        assert(pObj->Implements(ObjectInterfaceType::Movable));
        dynamic_cast<CMovableObject&>(*pObj).GetMotion()->SetAction(MHS_SATCOM, 0.5f);  // reads the SatCom

        m_camera->GetCamera(m_initialEye, m_initialLookat);
        m_camera->SetType(Gfx::CAM_TYPE_SCRIPT);
        m_camera->SetSmooth(Gfx::CAM_SMOOTH_HARD);
        m_camera->SetScriptCamera(m_initialEye, m_initialLookat);

        glm::mat4 mat = pObj->GetWorldMatrix(0);
        m_finalLookat[0] = Math::Transform(mat, glm::vec3( 1.6f, 1.0f, 1.2f));
        m_finalEye[0]    = Math::Transform(mat, glm::vec3(-1.5f, 5.0f, 3.0f));
        m_finalLookat[1] = Math::Transform(mat, glm::vec3( 1.6f, 1.0f, 1.2f));
        m_finalEye[1]    = Math::Transform(mat, glm::vec3( 0.8f, 3.0f, 0.8f));
    }

    if ( m_type == MM_SATCOMclose )
    {
        pObj = m_main->SearchHuman();
        if ( pObj != nullptr )
        {
            assert(pObj->Implements(ObjectInterfaceType::Movable));
            dynamic_cast<CMovableObject&>(*pObj).GetMotion()->SetAction(-1);  // finishes reading SatCom
        }

        m_camera->SetType(Gfx::CAM_TYPE_BACK);
        m_type = MM_NONE;  // it's already over!
    }

    return true;
}

// Stop a current movie.

bool CMainMovie::Stop()
{
    CObject*    pObj;

    if ( m_type == MM_SATCOMopen )
    {
        pObj = m_main->SearchHuman();
        if ( pObj != nullptr )
        {
            assert(pObj->Implements(ObjectInterfaceType::Movable));
            dynamic_cast<CMovableObject&>(*pObj).GetMotion()->SetAction(-1);  // finishes reading SatCom
        }
    }

    m_type = MM_NONE;
    return true;
}

// Indicates whether a film is in progress.

bool CMainMovie::IsExist()
{
    return (m_type != MM_NONE);
}


// Processing an event.

bool CMainMovie::EventProcess(const Event &event)
{
    if ( m_type == MM_NONE )  return true;

    m_progress += event.rTime*m_speed;

    if ( m_type == MM_SATCOMopen )
    {
        if ( m_progress < 1.0f )
        {
            glm::vec3 initialEye, initialLookat;
            glm::vec3 finalEye, finalLookat, eye, lookat;

            float progress = 1.0f-powf(1.0f-m_progress, 3.0f);

            if ( progress < 0.6f )
            {
                progress = progress/0.6f;
                initialEye    = m_initialEye;
                initialLookat = m_initialLookat;
                finalEye      = m_finalEye[0];
                finalLookat   = m_finalLookat[0];
            }
            else
            {
                progress = (progress-0.6f)/0.3f;
                initialEye    = m_finalEye[0];
                initialLookat = m_finalLookat[0];
                finalEye      = m_finalEye[1];
                finalLookat   = m_finalLookat[1];
            }
            if ( progress > 1.0f )  progress = 1.0f;

            eye = (finalEye-initialEye)*progress+initialEye;
            lookat = (finalLookat-initialLookat)*progress+initialLookat;
            m_camera->SetScriptCameraAnimate(eye, lookat);
        }
        else
        {
            m_stopType = m_type;
            Flush();
            return false;
        }
    }

    if ( m_type == MM_SATCOMclose )
    {
        if ( m_progress < 1.0f )
        {
        }
        else
        {
            m_stopType = m_type;
            Flush();
            return false;
        }
    }

    return true;
}


// Returns the type of the current movie.

MainMovieType CMainMovie::GetType()
{
    return m_type;
}

// Returns the type of movie stop.

MainMovieType CMainMovie::GetStopType()
{
    return m_stopType;
}