/*
 *   Easy Slider 1.7 - 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: '',
      nextId: 'nextBtn',
      nextText: '',
      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,
      numeric: false,
      numericId: 'controls'
    };

    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();
      var clickable = true;
      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.continuous) {
        if (!options.vertical) {                                        // vertical scroll fix
          $("ul", obj).prepend($("ul li:last-child", obj).clone().css("margin-left", "-" + w + "px"));     // vertical scroll fix
        } else {                                                // vertical scroll fix
          $("ul", obj).prepend($("ul li:last-child", obj).clone().css("margin-top", "0px"));         // vertical scroll fix
        }
        $("ul", obj).append($("ul li:nth-child(2)", obj).clone());
        $("ul", obj).css('width', (s + 1) * w);
      };

      if (!options.vertical) $("li", obj).css('float', 'left');

      if (options.controlsShow) {
        var html = options.controlsBefore;
        if (options.numeric) {
          html += '<ol id="' + options.numericId + '"></ol>';
        } else {
          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>';

          // text 'n of n' for images

          html += '<div id="' + "imageOf" + '">';
          html += ' <span id="' + "imageNmbr" + '">' + (t + 1) + '</span>';
          html += ' of <span>' + s + '</span>';
          html += '</div>';
        };

        html += options.controlsAfter;
        $(obj).after(html);
      };

      if (options.numeric) {
        for (var i = 0; i < s; i++) {
          $(document.createElement("li"))
            .attr('id', options.numericId + (i + 1))
            .html('<a rel=' + i + ' href=\"javascript:void(0);\">' + (i + 1) + '</a>')
            .appendTo($("#" + options.numericId))
            .click(function () {
              animate($("a", $(this)).attr('rel'), true);
            });
        };
      } else {
        $("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 setCurrent(i) {
        i = parseInt(i) + 1;
        $("li", "#" + options.numericId).removeClass("current");
        $("li#" + options.numericId + i).addClass("current");
      };

      function adjust() {
        if (t > ts) t = 0;
        if (t < 0) t = ts;
        if (!options.vertical) {
          $("ul", obj).css("margin-left", (t * w * -1));
        } else {
          $("ul", obj).css("margin-top", (t * h * -1));                             // vertical scroll fix
        }
        clickable = true;
        if (options.numeric) setCurrent(t);
        if (!options.numeric) { $("#imageNmbr").text(t + 1) };
      };

      function animate(dir, clicked) {
        if (clickable) {
          clickable = false;
          var ot = t;
          switch (dir) {
            case "next":
              t = (ot >= ts) ? (options.continuous ? t + 1 : ts) : t + 1;
              break;
            case "prev":
              t = (t <= 0) ? (options.continuous ? t - 1 : 0) : t - 1;
              break;
            case "first":
              t = 0;
              break;
            case "last":
              t = ts;
              break;
            default:
              t = dir;
              break;
          };
          var diff = Math.abs(ot - t);
          var speed = diff * options.speed;
          if (!options.vertical) {
            p = (t * w * -1);
            $("ul", obj).animate(
              { marginLeft: p },
              { queue: false, duration: speed, complete: adjust }
            );
          } else {
            p = (t * h * -1);
            $("ul", obj).animate(
              { marginTop: p },
              { queue: false, duration: speed, complete: adjust }
            );
          };
          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.numeric) setCurrent(0);

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

    });

  };

})(jQuery);