/*
*   Easy Slider 1.5 - jQuery plugin
*  written by Alen Grakalic  
*  http://cssglobe.com/post/4004/easy-slider-15-the-easiest-jquery-plugin-for-sliding
*
*  Copyright (c) 2009 Alen Grakalic (http://cssglobe.com)
*  Dual licensed under the MIT (MIT-LICENSE.txt)
*  and GPL (GPL-LICENSE.txt) licenses.
*
*  Built for jQuery library
*  http://jquery.com
*
*/

/*
*  markup example for $("#slider").easySlider();
*  
*   <div id="slider">
*    <ul>
*      <li><img src="images/01.jpg" alt="" /></li>
*      <li><img src="images/02.jpg" alt="" /></li>
*      <li><img src="images/03.jpg" alt="" /></li>
*      <li><img src="images/04.jpg" alt="" /></li>
*      <li><img src="images/05.jpg" alt="" /></li>
*    </ul>
*  </div>
*
*/

(function ($) {
    
  $.fn.easySlider = function (options) {

    // default configuration properties
    var defaults = {
      prevId: 'prevBtn',
      prevText: 'Previous',
      nextId: 'nextBtn',
      nextText: 'Next',
      controlsShow: true,
      controlsBefore: '',
      controlsAfter: '',
      controlsFade: true,
      firstId: 'firstBtn',
      firstText: 'First',
      firstShow: false,
      lastId: 'lastBtn',
      lastText: 'Last',
      lastShow: false,
      vertical: false,
      speed: 800,
      auto: false,
      pause: 2000,
      continuous: false
    };

    var options = $.extend(defaults, options);

    this.each(function () {
      var obj = $(this);
      var s = $("li", obj).length;
      var w = $("li", obj).width();
      var h = $("li", obj).height();
      obj.width(w);
      obj.height(h);
      obj.css("overflow", "hidden");
      var ts = s - 1;
      var t = 0;
      $("ul", obj).css('width', s * w);
      if (!options.vertical) $("li", obj).css('float', 'left');

      if (options.controlsShow) {
        var html = options.controlsBefore;
        if (options.firstShow) html += '<span id="' + options.firstId + '"><a href=\"javascript:void(0);\">' + options.firstText + '</a></span>';
        html += ' <span id="' + options.prevId + '"><a href=\"javascript:void(0);\">' + options.prevText + '</a></span>';
        html += ' <span id="' + options.nextId + '"><a href=\"javascript:void(0);\">' + options.nextText + '</a></span>';
        if (options.lastShow) html += ' <span id="' + options.lastId + '"><a href=\"javascript:void(0);\">' + options.lastText + '</a></span>';
        html += options.controlsAfter;
        $(obj).after(html);
      };

      $("a", "#" + options.nextId).click(function () {
        animate("next", true);
      });
      $("a", "#" + options.prevId).click(function () {
        animate("prev", true);
      });
      $("a", "#" + options.firstId).click(function () {
        animate("first", true);
      });
      $("a", "#" + options.lastId).click(function () {
        animate("last", true);
      });

      function animate(dir, clicked) {
        var ot = t;
        switch (dir) {
          case "next":
            t = (ot >= ts) ? (options.continuous ? 0 : ts) : t + 1;
            break;
          case "prev":
            t = (t <= 0) ? (options.continuous ? ts : 0) : t - 1;
            break;
          case "first":
            t = 0;
            break;
          case "last":
            t = ts;
            break;
          default:
            break;
        };

        var diff = Math.abs(ot - t);
        var speed = diff * options.speed;
        if (!options.vertical) {
          p = (t * w * -1);
          $("ul", obj).animate(
            { marginLeft: p },
            speed
          );
        } else {
          p = (t * h * -1);
          $("ul", obj).animate(
            { marginTop: p },
            speed
          );
        };

        if (!options.continuous && options.controlsFade) {
          if (t == ts) {
            $("a", "#" + options.nextId).hide();
            $("a", "#" + options.lastId).hide();
          } else {
            $("a", "#" + options.nextId).show();
            $("a", "#" + options.lastId).show();
          };
          if (t == 0) {
            $("a", "#" + options.prevId).hide();
            $("a", "#" + options.firstId).hide();
          } else {
            $("a", "#" + options.prevId).show();
            $("a", "#" + options.firstId).show();
          };
        };

        if (clicked) clearTimeout(timeout);
        if (options.auto && dir == "next" && !clicked) {
          ;
          timeout = setTimeout(function () {
            animate("next", false);
          }, diff * options.speed + options.pause);
        };

      };
      // init
      var timeout;
      if (options.auto) {
        ;
        timeout = setTimeout(function () {
          animate("next", false);
        }, options.pause);
      };

      if (!options.continuous && options.controlsFade) {
        $("a", "#" + options.prevId).hide();
        $("a", "#" + options.firstId).hide();
      };

    });

  };

})(jQuery);