/**
 * @file display_editor.js
 *
 * Contains the javascript for the Panels display editor.
 */

(function ($) {

// randomly lock a pane.
// @debug only
Drupal.settings.Panels = Drupal.settings.Panels || {};


/** Delete pane button **/
Drupal.Panels.bindClickDelete = function(context) {
  $('a.pane-delete:not(.pane-delete-processed)', context)
    .addClass('pane-delete-processed')
    .click(function() {
    if (confirm(Drupal.t('Remove this pane?'))) {
      var id = '#' + $(this).attr('id').replace('pane-delete-', '');
      $(id).remove();
      Drupal.Panels.Draggable.savePositions();
    }
    return false;
  });
};

Drupal.Panels.bindPortlet = function() {
  var handle = $(this).find('.panel-pane-collapsible > div.pane-title');
  var content = $(this).find('.panel-pane-collapsible > div.pane-content');
  if (content.length) {
    var toggle = $('<span class="toggle toggle-collapsed"></span>');
    handle.before(toggle);
    toggle.click(function() {
      content.slideToggle(20);
      toggle.toggleClass('toggle-collapsed');
    });
    handle.click(function() {
      content.slideToggle(20);
      toggle.toggleClass('toggle-collapsed');
    });
    content.hide();
  }
};

Drupal.Panels.Draggable = {
  // The draggable object
  object: null,

  // Where objects can be dropped
  dropzones: [],
  current_dropzone: null,

  // positions within dropzones where an object can be plazed
  landing_pads: [],
  current_pad: null,

  // Where the object is
  mouseOffset: { x: 0, y: 0 },
  windowOffset: { x: 0, y: 0 },
  offsetDivHeight: 0,

  // original settings to be restored
  original: {},
  // a placeholder so that if the object is let go but not over a drop zone,
  // it can be put back where it belongs
  placeholder: {},

  hoverclass: 'hoverclass',
  helperclass: 'helperclass',
  accept: 'div.panel-region',
  handle: 'div.grabber',
  draggable: 'div.panel-portlet',
  main: 'div#panels-dnd-main',

  // part of the id to remove to get just the number
  draggableId: 'panel-pane-',

  // part of the id to remove to get just the number
  regionId: 'panel-region-',

  // What to add to the front of a the id to get the form id for a panel
  formId: 'input#edit-',

  maxWidth: 250,

  unsetDropZone: function() {
    $(this.current_dropzone.obj).removeClass(this.hoverclass);
    this.current_dropzone = null;
    for (var i in this.landing_pads) {
      $(this.landing_pads[i].obj).remove();
    }
    this.landing_pads = [];
    this.current_pad = null;
  },

  createLandingPad: function(where, append) {
    var obj = $('<div class="' + this.helperclass +'" id="' +
      $(where).attr('id') + '-dropzone">&nbsp;</div>');
    if (append) {
      $(where).append(obj);
    }
    else {
      $(where).before(obj);
    }
    var offset = $(obj).offset();

    $(obj).css({
      display: 'none'
    });
    this.landing_pads.push({
      centerX: offset.left + ($(obj).innerWidth() / 2),
      centerY: offset.top + ($(obj).innerHeight() / 2),
      obj: obj
    });
    return obj;
  },

  calculateDropZones: function(event, dropzone) {
    var draggable = Drupal.Panels.Draggable;
    var dropzones = [];
    $(this.accept).each(function() {
      var offset = $(this).offset();
      offset.obj = this;
      offset.region = this.id.replace(draggable.regionId, '');
      offset.width = $(this).outerWidth();
      offset.height = $(this).outerHeight();
      dropzones.push(offset);
    });
    this.dropzones = dropzones;
  },

  reCalculateDropZones: function() {
    for (var i in this.dropzones) {
      var offset = $(this.dropzones[i].obj).offset();
      offset.width = $(this.dropzones[i].obj).outerWidth();
      offset.height = $(this.dropzones[i].obj).outerHeight();
      $.extend(this.dropzones[i], offset);
    }
  },

  changeDropZone: function(new_dropzone) {
    // Unset our old dropzone.
    if (this.current_dropzone) {
      this.unsetDropZone();
    }

    // Set up our new dropzone.
    this.current_dropzone = new_dropzone;
    $(this.current_dropzone.obj).addClass(this.hoverclass);
    // add a landing pad
    this.createLandingPad(this.current_dropzone.obj, true);

    var that = this;
    // Create a landing pad before each existing portlet.
    $(this.current_dropzone.obj).find(this.draggable).each(function() {
      if (that.object.id != this.id) {
        that.createLandingPad(this, false);
      }
    });
  },

  findLandingPad: function(x, y) {
    var shortest_distance = null;
    var nearest_pad = null;
    // find the nearest pad.
    for (var i in this.landing_pads) {
      // This isn't the real distance, this is the square of the
      // distance -- no point in spending processing time on
      // sqrt.
      var dstx = Math.abs(x - this.landing_pads[i].centerX);
      var dsty = Math.abs(y - this.landing_pads[i].centerY);
      var distance =  (dstx * dstx) + (dsty * dsty);
      if (shortest_distance == null || distance < shortest_distance) {
        shortest_distance = distance;
        nearest_pad = this.landing_pads[i];
      }
    }
    if (nearest_pad != this.current_pad) {
      if (this.current_pad) {
        $(this.current_pad.obj).hide();
      }
      this.current_pad = nearest_pad;
      $(nearest_pad.obj).show();
    }
  },

  findDropZone: function(x, y) {
    // Go through our dropzones and see if we're over one.
    var new_dropzone = null;
    for (var i in this.dropzones) {
//      console.log('x:' + x + ' left:' + this.dropzones[i].left + ' right: ' + this.dropzones[i].left + this.dropzones[i].width);
      if (this.dropzones[i].left < x &&
        x < this.dropzones[i].left + this.dropzones[i].width &&
        this.dropzones[i].top < y &&
        y < this.dropzones[i].top + this.dropzones[i].height) {
          new_dropzone = this.dropzones[i];
          break;
      }
    }
    // If we're over one, see if it's different.
    if (new_dropzone && (!this.regionLock || this.regionLockRegions[new_dropzone.region])) {
      var changed = false;
      if (!this.current_dropzone || new_dropzone.obj.id != this.current_dropzone.obj.id) {
        this.changeDropZone(new_dropzone);
        changed = true;
      }
      this.findLandingPad(x, y);
      if (changed)  {
        // recalculate the size of our drop zones due to the fact that we're drawing landing pads.
        this.reCalculateDropZones();
      }
    }
    // If we're not over one, be sure to unhilite one if we were just
    // over it.
    else if (this.current_dropzone) {
      this.unsetDropZone();
    }
  },

  /** save button clicked, or pane deleted **/
  savePositions: function() {
    var draggable = Drupal.Panels.Draggable;
    $(draggable.accept).each(function() {
      var val = '';
      $(this).find(draggable.draggable).each(function() {
        if (val) {
          val += ',';
        }

        val += this.id.replace(draggable.draggableId, '');
      });
      var region = this.id.replace(draggable.regionId, '');
      $('input[name="panel[pane][' +  region + ']"]').val(val);
    });
    return false;
  }
};

Drupal.Panels.DraggableHandler = function() {
  $(this).addClass('panel-draggable');
  var draggable = Drupal.Panels.Draggable;
  var scrollBuffer = 10;
  var scrollDistance = 10;
  var scrollTimer = 30;

  getMouseOffset = function(docPos, mousePos, windowPos) {
    return { x: mousePos.x - docPos.x + windowPos.x, y: mousePos.y - docPos.y + windowPos.y};
  };

  getMousePos = function(ev) {
    ev = ev || window.event;

    if (ev.pageX || ev.pageY) {
      return { x:ev.pageX, y:ev.pageY };
    }
    return {
      x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
      y:ev.clientY + document.body.scrollTop  - document.body.clientTop
    };
  };

  getPosition = function(e) {
    /*
    if (document.defaultView && document.defaultView.getComputedStyle) {
      var css = document.defaultView.getComputedStyle(e, null);
      return {
        x: parseInt(css.getPropertyValue('left')),
        y: parseInt(css.getPropertyValue('top'))
      };
    }
    */
    var left = 0;
    var top  = 0;

    while (e.offsetParent) {
      left += e.offsetLeft;
      top  += e.offsetTop;
      e     = e.offsetParent;
    }

    left += e.offsetLeft;
    top  += e.offsetTop;

    return { x:left, y:top };
  };

  mouseUp = function(e) {
    clearTimeout(draggable.timeoutId);
    draggable.dropzones = [];

    if (draggable.current_pad) {
      // Drop the object where we're hovering
      $(draggable.object).insertAfter($(draggable.current_pad.obj));
      Drupal.Panels.changed($(draggable.object));
    }
    else {
      // or put it back where it came from
      $(draggable.object).insertAfter(draggable.placeholder);
    }
    // remove the placeholder
    draggable.placeholder.remove();

    // restore original settings.
    $(draggable.object).css(draggable.original);
    if (draggable.current_dropzone) {
      draggable.unsetDropZone();
    }

    $(document).unbind('mouseup').unbind('mousemove');
    draggable.savePositions();
  };

  mouseMove = function(e) {
    draggable.mousePos = getMousePos(e);

    draggable.findDropZone(draggable.mousePos.x, draggable.mousePos.y);

    var windowMoved = parseInt(draggable.offsetDivHeight - $(draggable.main).innerHeight());

    draggable.object.style.top = draggable.mousePos.y - draggable.mouseOffset.y + windowMoved + 'px';
    draggable.object.style.left = draggable.mousePos.x - draggable.mouseOffset.x  + 'px';
    $(draggable.object).toggleClass('moving');
  };

  mouseDown = function(e) {
    // If we mouse-downed over something clickable, don't drag!
    if (e.target.nodeName == 'A' || e.target.nodeName == 'INPUT' || e.target.parentNode.nodeName == 'A' || e.target.nodeName.nodeName == 'INPUT') {
      return;
    }

    draggable.object = $(this).parent(draggable.draggable).get(0);
    draggable.paneId = draggable.object.id.replace(draggable.draggableId, '');

    // create a placeholder so we can put this object back if dropped in an invalid location.
    draggable.placeholder = $('<div class="draggable-placeholder-object" style="display:none"></div>"');
    $(draggable.object).after(draggable.placeholder);

    // Store original CSS so we can put it back.
    draggable.original = {
      position: $(draggable.object).css('position'),
      width: 'auto',
      left: $(draggable.object).css('left'),
      top: $(draggable.object).css('top'),
      'z-index': $(draggable.object).css('z-index'),
      'margin-bottom': $(draggable.object).css('margin-bottom'),
      'margin-top': $(draggable.object).css('margin-top'),
      'margin-left': $(draggable.object).css('margin-left'),
      'margin-right': $(draggable.object).css('margin-right'),
      'padding-bottom': $(draggable.object).css('padding-bottom'),
      'padding-top': $(draggable.object).css('padding-top'),
      'padding-left': $(draggable.object).css('padding-left'),
      'padding-right': $(draggable.object).css('padding-right')
    };

    draggable.mousePos = getMousePos(e);
    var originalPos = $(draggable.object).offset();
    var width = Math.min($(draggable.object).innerWidth(), draggable.maxWidth);

    draggable.offsetDivHeight = $(draggable.main).innerHeight();
    draggable.findDropZone(draggable.mousePos.x, draggable.mousePos.y);

    // Make copies of these because in FF3, they actually change when we
    // move the item, whereas they did not in FF2.

    if (e.layerX || e.layerY) {
      var layerX = e.layerX;
      var layerY = e.layerY;
    }
    else if (e.originalEvent && e.originalEvent.layerX) {
      var layerX = e.originalEvent.layerX;
      var layerY = e.originalEvent.layerY;
    }

    // Make the draggable relative, get it out of the way and make it
    // invisible.
    $(draggable.object).css({
      position: 'relative',
      'z-index': 100,
      width: width + 'px',
      'margin-bottom': (-1 * parseInt($(draggable.object).outerHeight())) + 'px',
      'margin-top': 0,
      'margin-left': 0,
      'margin-right': (-1 * parseInt($(draggable.object).outerWidth())) + 'px',
      'padding-bottom': 0,
      'padding-top': 0,
      'padding-left': 0,
      'padding-right': 0,
      'left': 0,
      'top': 0
    })
      .insertAfter($(draggable.main));
    var newPos = $(draggable.object).offset();

    var windowOffset = { left: originalPos.left - newPos.left, top: originalPos.top - newPos.top }

    // if they grabbed outside the area where we make the draggable smaller, move it
    // closer to the cursor.
    if (layerX != 'undefined' && layerX > width) {
      windowOffset.left += layerX - 10;
    }
    else if (layerX != 'undefined' && e.offsetX > width) {
      windowOffset.left += e.offsetX - 10;
    }

    // This is stored so we can move with it.
    draggable.mouseOffset = { x: draggable.mousePos.x - windowOffset.left, y: draggable.mousePos.y - windowOffset.top};
    draggable.offsetDivHeight = $(draggable.main).innerHeight();

    draggable.object.style.top = windowOffset.top + 'px';
    draggable.object.style.left = windowOffset.left + 'px';
    $(document).unbind('mouseup').unbind('mousemove').mouseup(mouseUp).mousemove(mouseMove);

    draggable.calculateDropZones(draggable.mousePos, e);
    draggable.timeoutId = setTimeout('timer()', scrollTimer);

    // If locking to a particular set of regions, set that:
    if (Drupal.settings.Panels && Drupal.settings.Panels.RegionLock && Drupal.settings.Panels.RegionLock[draggable.paneId]) {
      draggable.regionLock = true;
      draggable.regionLockRegions = Drupal.settings.Panels.RegionLock[draggable.paneId];
    }
    else {
      draggable.regionLock = false;
      draggable.regionLockRegions = null;
    }

    return false;
  };

  timer = function() {
    if (!draggable.timeCount) {
      draggable.timeCount = 0;
    }
    draggable.timeCount = draggable.timeCount + 1;
    var left = $(window).scrollLeft();
    var right = left + $(window).width();
    var top = $(window).scrollTop();
    var bottom = top + $(window).height();

    if (draggable.mousePos.x < left + scrollBuffer && left > 0) {
      window.scrollTo(left - scrollDistance, top);
      draggable.mousePos.x -= scrollDistance;
      draggable.object.style.top = draggable.mousePos.y - draggable.mouseOffset.y + 'px';
    }
    else if (draggable.mousePos.x > right - scrollBuffer) {
      window.scrollTo(left + scrollDistance, top);
      draggable.mousePos.x += scrollDistance;
      draggable.object.style.top = draggable.mousePos.y - draggable.mouseOffset.y + 'px';
    }
    else if (draggable.mousePos.y < top + scrollBuffer && top > 0) {
      window.scrollTo(left, top - scrollDistance);
      draggable.mousePos.y -= scrollDistance;
      draggable.object.style.top = draggable.mousePos.y - draggable.mouseOffset.y + 'px';
    }
    else if (draggable.mousePos.y > bottom - scrollBuffer) {
      window.scrollTo(left, top + scrollDistance);
      draggable.mousePos.y += scrollDistance;
      draggable.object.style.top = draggable.mousePos.y - draggable.mouseOffset.y + 'px';
    }

    draggable.timeoutId = setTimeout('timer()', scrollTimer);
  }

  $(this).mousedown(mouseDown);
};

$.fn.extend({
  panelsDraggable: Drupal.Panels.DraggableHandler
});

/**
 * Implement Drupal behavior for autoattach
 */
Drupal.behaviors.PanelsDisplayEditor = {
  attach: function(context) {
    // Show javascript only items.
    $('span#panels-js-only').css('display', 'inline');

    $('#panels-dnd-main div.panel-pane:not(.panel-portlet)')
      .addClass('panel-portlet')
      .each(Drupal.Panels.bindPortlet);

    // The above doesn't work if context IS the pane, so do this to catch that.
    if ($(context).hasClass('panel-pane') && !$(context).hasClass('panel-portlet')) {
      $(context)
        .addClass('panel-portlet')
        .each(Drupal.Panels.bindPortlet);
    }

    // Make draggables and make sure their positions are saved.
    $(context).find('div.grabber:not(.panel-draggable)').panelsDraggable();
    Drupal.Panels.Draggable.savePositions();

    // Bind buttons.
    $('input#panels-hide-all', context).click(Drupal.Panels.clickHideAll);
    $('input#panels-show-all', context).click(Drupal.Panels.clickShowAll);

    Drupal.Panels.bindClickDelete(context);

    $('#panels-live-preview-button:not(.panels-preview-processed)')
      .addClass('panels-preview-processed')
      .click(function () {
        if (!$('#panels-preview').size()) {
          $('#panels-dnd-main').parents('form').after('<div id="panels-preview" class="clearfix"></div>');
        }
        var html = '';
        html += '  <div id="modal-throbber">';
        html += '    <div class="modal-throbber-wrapper">';
        html +=        Drupal.settings.CToolsModal.throbber;
        html += '    </div>';
        html += '  </div>';

        $('#panels-preview').html(html);
      });

    var setTitleClass = function () {
      if ($('#edit-display-title-hide-title').val() == 2) {
        $('#panels-dnd-main').removeClass('panels-set-title-hide');
      }
      else {
        $('#panels-dnd-main').addClass('panels-set-title-hide');
      }
    }

    // The panes have an option to set the display title, but only if
    // a select is set to the proper value. This sets a class on the
    // main edit div so that the option to set the display title
    // is hidden if that is not selected, and visible if it is.
    $('#edit-display-title-hide-title:not(.panels-title-processed)')
      .addClass('panels-title-processed')
      .change(setTitleClass);

    setTitleClass();
  }
}

$(function() {
  /**
   * AJAX responder command to render the preview.
   */
  Drupal.ajax.prototype.commands.panel_preview = function(ajax, command, status) {
    $('#panels-preview').html(command.output);
  }
});

})(jQuery);
