#include "tools.h"

#include <math.h>


namespace LtsScriptTimeline
{
//int   Tools::m_timelineLength = 5*60; // minimum len
//float Tools::m_zoomFactor = 1;
//int   Tools::m_scrollPos = 0;
//int   Tools::m_paintWidth = 1; // rescue from possible 0-div


int Tools::getLength(int startTime, int duration)
{
  return /*std::abs*/ (getPos(startTime + duration) - getPos(startTime));
}


int Tools::getDuration(int duration) // px => time
{
  double max = Tools::m_timelineLength;
  max /= Tools::m_zoomFactor;

  int paintWidth = m_paintWidth; // => 350px

  double x = duration;  // => 466
  x /= paintWidth; // => 466 / 350px  =  1,33
  x *= max;       // => 1,33 * 300  =  400

  return lrint(x);
}


int Tools::getTime(int pos, bool neutral) // px => time
{
  double visibleMax = Tools::m_timelineLength;
  visibleMax /= Tools::m_zoomFactor;

  if (!neutral)
    visibleMax += Tools::m_scrollPos;

  int visibleMin = 0;

  if (!neutral)
    visibleMin = Tools::m_scrollPos;

  double diff = visibleMax - visibleMin; // => 500 - 200  =  300
  int paintWidth = m_paintWidth; // => 350px

  double x = pos;  // => 466
  x /= paintWidth; // => 466 / 350px  =  1,33
  x *= diff;       // => 1,33 * 300  =  400
  x += visibleMin; // => 400 + 0

  return lrint(x);
}


int Tools::getPos(int time, bool neutral) // time => px
{
  double visibleMax = Tools::m_timelineLength;
  visibleMax /= Tools::m_zoomFactor;

  if (!neutral)
    visibleMax += Tools::m_scrollPos;

  int visibleMin = 0;

  if (!neutral)
    visibleMin = Tools::m_scrollPos;

  double diff = visibleMax - visibleMin; // => 500 - 200  =  300
  int paintWidth = m_paintWidth; // => 350px

  double x = time; // => 400
  x -= visibleMin; // => 400 - 0  =  400
  x /= diff;       // => 400 / 300  =  1,333
  x *= paintWidth; // => 1,333 * 350px  =  466,666

  return lrint(x);
}

} // namespace LtsScriptTimeline