/**
  * @RDE_HEADER@
  * Implements n QLedChars to display a line of Text/Image
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Florian Schult, SLSE, 2016-03-18
  */
#include "qledline.h"

#include <QString>
#include <QLayout>
#include <QTimer>
#include <QImage>

#include "qledchar.h"

QLedLine::QLedLine(QWidget *parent)
  : QWidget(parent)
  , m_charCount(0)
  , m_height(0)
  , m_visible(true)
  , m_text()
  , m_layout(new QHBoxLayout(this))
  , m_chars()
  , m_flashTimer(new QTimer(this))
  , m_color(Qt::red)     // Standard color
  , m_image()
{
  m_layout->setSpacing(0);
  m_layout->setContentsMargins(0,0,0,0);
  m_layout->setMargin(0);

  QSpacerItem *sp1 = new QSpacerItem(0,0, QSizePolicy::Expanding, QSizePolicy::Expanding);
  QSpacerItem *sp2 = new QSpacerItem(0,0, QSizePolicy::Expanding, QSizePolicy::Expanding);

  m_layout->addSpacerItem(sp1);
  m_layout->addSpacerItem(sp2);
  m_layout->setAlignment(m_layout, Qt::AlignHCenter);
}

QLedLine::~QLedLine()
{
  qDeleteAll(m_chars);
  // optional. They have "this" as parent and are QT.
  delete m_layout;
  delete m_flashTimer;
}

QString QLedLine::shownText() const
{
  return m_text.leftJustified(m_chars.size(), QLatin1Char(' '), true);
}

bool QLedLine::isTextVisible() const
{
  return m_visible;
}

int QLedLine::flashTime() const
{
  return m_flashTimer->interval();
}

QColor QLedLine::color() const
{
  return m_color;
}

void QLedLine::setText(const QString &text)
{
  m_text = text;

  // Todo: Arabic: RightJustified? Automatic?
  QString shown = shownText();
  for (int i=0; i<m_chars.size(); ++i)
    m_chars[i]->setLetter(shown[i]);
}

// Expects a properly sized QImage, corresponding to the count and Pixelsizes of QLedLine and QLedChar
void QLedLine::setImage(const QImage &image)
{
  m_image = image;
  QImage charImage;
  QSize  charSize = m_chars[0]->charSize();

  for (int i=0; i<m_chars.size(); ++i)
  {
    charImage = m_image.copy((charSize.width() * i), 0, charSize.width(), charSize.height());
    m_chars[i]->setImage(charImage);
  }
}

QSize QLedLine::charSize() const
{
  return m_chars[0]->charSize();
}

QString QLedLine::text() const
{
  return m_text;
}

void QLedLine::addChar()
{
  QLedChar *ledChar = new QLedChar(m_height, this, m_text[m_chars.size()]);
  ledChar->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
  if (!m_chars.isEmpty())
    ledChar->setLetterVisible(m_chars[0]->letterVisible());
  connect(m_flashTimer, &QTimer::timeout, ledChar, &QLedChar::onFlashTimerTimeout);
  ledChar->setColor(m_color);

  // Takes the last stretch-item and puts it behind the new added ledChar
  QLayoutItem *spacer = m_layout->takeAt(m_layout->count()-1);
  m_layout->addWidget(ledChar);
  m_layout->addItem(spacer);

  m_chars.append(ledChar);
  ledChar->setLetter(shownText().at(m_chars.size()-1));
}

void QLedLine::deleteChar()
{
  if (m_chars.isEmpty())
    return;

  delete m_chars.last();
  m_chars.remove(m_chars.size()-1);
}

void QLedLine::setCharCount(int charCount)
{
  m_charCount = charCount;
  while(m_chars.size() != m_charCount)
  {
    if(m_chars.size() > m_charCount)
      deleteChar();
    else if(m_chars.size() < m_charCount)
      addChar();
  }
}

int QLedLine::charCount() const
{
  return m_charCount;
}

void QLedLine::setHeight(int height)
{
  m_height = height;

  for(int i=0; i<m_chars.size(); ++i)
  {
    m_chars[i]->setCharHeight(m_height);
  }
  setText(m_text);
}

int QLedLine::height() const
{
  return m_height;
}

void QLedLine::setCharCountAndHeight(int charCount, int height)
{
  setHeight(height);
  setCharCount(charCount);
}

void QLedLine::setColor(const QColor &color)
{
  m_color = color;
  for (int i=0; i<m_charCount; ++i)
    m_chars[i]->setColor(color);
}

void QLedLine::clear()
{
  for (int i=0; i<m_charCount; ++i)
  {
    m_chars[i]->setLetterVisible(false);
    m_chars[i]->setLetterVisible(true);
  }
}

void QLedLine::setFlashing(int msecs)
{
  m_flashTimer->setInterval(msecs);
  if (msecs == 0)
  {
    if (m_visible)
    {
      for (int i = 0; i < m_chars.size(); ++i)
        m_chars[i]->setLetterVisible();
    }
    m_flashTimer->stop();
  }
  else
  {
    if(m_visible)
      m_flashTimer->start();
    else
      m_flashTimer->stop();
  }
}

void QLedLine::setTextVisible(bool visible)
{
  m_visible = visible;
  for (int i=0; i<m_chars.size(); ++i)
    m_chars[i]->setLetterVisible(m_visible);

  if(m_visible)
  {
    if(m_flashTimer->interval() > 0)
      m_flashTimer->start();
  }
  else
  {
    m_flashTimer->stop();
  }
}