var currentPosition = 0;
var slideWidth = 840;
var slides;
var numberOfSlides = 0;
var delay = 6000;
var timer;

$(document).ready(function(){
  slides = $('.slide');
  numberOfSlides = slides.length;

  // Remove scrollbar in JS
  $('#slidesContainer').css('overflow', 'hidden');

  // Wrap all .slides with #slideInner div
  slides
    .wrapAll('<div id="slideInner"></div>')
    // Float left to display horizontally, readjust .slides width
	.css({
      'float' : 'left',
      'width' : slideWidth
    });

  // Set #slideInner width equal to total width of all slides
  $('#slideInner').css('width', slideWidth * numberOfSlides);

  // Insert controls in the DOM
  $('#slideshow')
    .prepend('<span class="control" id="leftControl">Visa föregående</span>')
    .append('<span class="position" id="position">1</span>')
    .append('<span class="control" id="rightControl">Visa nästa</span>');

  // Hide left arrow control on first load
  manageControls(currentPosition);
  timer = setInterval("autoslide()", delay);
  
  // Create event listeners for .controls clicks
  $('.control')
    .bind('click', function(){
    // Stop timer
    clearInterval(timer);
    // Determine new position
	currentPosition = ($(this).attr('id')=='rightControl') ? currentPosition+1 : currentPosition-1;
	// Hide / show controls
    changeSlide();
  });
});

// manageControls: Hides and Shows controls depending on currentPosition
function manageControls(position){
    // Hide left arrow if position is first slide
	if(position==0){ $('#leftControl').hide() } else{ $('#leftControl').show() }
	// Hide right arrow if position is last slide
	if(position==numberOfSlides-1){ $('#rightControl').hide() } else{ $('#rightControl').show() }
	$("#position").html((position+1)+"/"+numberOfSlides);
}	

// autoslide: changing the slides automatically
function autoslide() {
	if(currentPosition < numberOfSlides-1)
		currentPosition = currentPosition+1;
	else
		currentPosition = 0;
	// Hide / show controls
	changeSlide();
}

// Show next slide
function changeSlide() {
    manageControls(currentPosition);
    $('#slideInner').animate({
      'marginLeft' : slideWidth*(-currentPosition)
    });
}