// Clearfix
// --------
// For clearing floats like a boss h5bp.com/q
.clearfix {
  *zoom: 1;
  &:before,
  &:after {
    display: table;
    content: "";
    // Fixes Opera/contenteditable bug:
    // http://nicolasgallagher.com/micro-clearfix-hack/#comment-36952
    line-height: 0;
  }
  &:after {
    clear: both;
  }
}

// Block level inputs
.input-block-level {
  display: block;
  width: 100%;
  min-height: @inputHeight; // Make inputs at least the height of their button counterpart (base line-height + padding + border)
  .box-sizing(border-box); // Makes inputs behave like true block-level elements
}

// Box sizing
.box-sizing(@boxmodel) {
  -webkit-box-sizing: @boxmodel;
     -moz-box-sizing: @boxmodel;
          box-sizing: @boxmodel;
}

// Centered container element
.container-fixed() {
  margin-right: auto;
  margin-left: auto;
  .clearfix();
}

// Table columns
.tableColumns(@columnSpan: 1) {
  float: none; // undo default grid column styles
  width: ((@gridColumnWidth) * @columnSpan) + (@gridGutterWidth * (@columnSpan - 1)) - 16; // 16 is total padding on left and right of table cells
  margin-left: 0; // undo default grid column styles
}

// Make a Grid
// Use .makeRow and .makeColumn to assign semantic layouts grid system behavior
.makeRow() {
  margin-left: @gridGutterWidth * -1;
  .clearfix();
}
.makeColumn(@columns: 1, @offset: 0) {
  float: left;
  margin-left: (@gridColumnWidth * @offset) + (@gridGutterWidth * (@offset - 1)) + (@gridGutterWidth * 2);
  width: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns - 1));
}

// The Grid
#grid {

  .core (@gridColumnWidth, @gridGutterWidth) {

    .spanX (@index) when (@index > 0) {
      (~".span@{index}") { .span(@index); }
      .spanX(@index - 1);
    }
    .spanX (0) {}

    .offsetX (@index) when (@index > 0) {
      (~".offset@{index}") { .offset(@index); }
      .offsetX(@index - 1);
    }
    .offsetX (0) {}

    .offset (@columns) {
      margin-left: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns + 1));
    }

    .span (@columns) {
      width: (@gridColumnWidth * @columns) + (@gridGutterWidth * (@columns - 1));
    }

    .row {
      margin-left: @gridGutterWidth * -1;
      .clearfix();
    }

    [class*="span"] {
      float: left;
      min-height: 1px; // prevent collapsing columns
      margin-left: @gridGutterWidth;
    }

    // Set the container width, and override it for fixed navbars in media queries
    .container,
    .navbar-static-top .container,
    .navbar-fixed-top .container,
    .navbar-fixed-bottom .container { .span(@gridColumns); }

    // generate .spanX and .offsetX
    .spanX (@gridColumns);
    .offsetX (@gridColumns);

  }

  .fluid (@fluidGridColumnWidth, @fluidGridGutterWidth) {

    .spanX (@index) when (@index > 0) {
      (~".span@{index}") { .span(@index); }
      .spanX(@index - 1);
    }
    .spanX (0) {}

    .offsetX (@index) when (@index > 0) {
      (~'.offset@{index}') { .offset(@index); }
      (~'.offset@{index}:first-child') { .offsetFirstChild(@index); }
      .offsetX(@index - 1);
    }
    .offsetX (0) {}

    .offset (@columns) {
      margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + (@fluidGridGutterWidth*2);
        *margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%) + (@fluidGridGutterWidth*2) - (.5 / @gridRowWidth * 100 * 1%);
    }

    .offsetFirstChild (@columns) {
      margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + (@fluidGridGutterWidth);
      *margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%) + @fluidGridGutterWidth - (.5 / @gridRowWidth * 100 * 1%);
    }

    .span (@columns) {
      width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1));
      *width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) - (.5 / @gridRowWidth * 100 * 1%);
    }

    .row-fluid {
      width: 100%;
      .clearfix();
      [class*="span"] {
        .input-block-level();
        float: left;
        margin-left: @fluidGridGutterWidth;
        *margin-left: @fluidGridGutterWidth - (.5 / @gridRowWidth * 100 * 1%);
      }
      [class*="span"]:first-child {
        margin-left: 0;
      }

      // Space grid-sized controls properly if multiple per line
      .controls-row [class*="span"] + [class*="span"] {
        margin-left: @fluidGridGutterWidth;
      }

      // generate .spanX and .offsetX
      .spanX (@gridColumns);
      .offsetX (@gridColumns);
    }

  }

  .input(@gridColumnWidth, @gridGutterWidth) {

    .spanX (@index) when (@index > 0) {
      (~"input.span@{index}, textarea.span@{index}, .uneditable-input.span@{index}") { .span(@index); }
      .spanX(@index - 1);
    }
    .spanX (0) {}

    .span(@columns) {
      width: ((@gridColumnWidth) * @columns) + (@gridGutterWidth * (@columns - 1)) - 14;
    }

    input,
    textarea,
    .uneditable-input {
      margin-left: 0; // override margin-left from core grid system
    }

    // Space grid-sized controls properly if multiple per line
    .controls-row [class*="span"] + [class*="span"] {
      margin-left: @gridGutterWidth;
    }

    // generate .spanX
    .spanX (@gridColumns);

  }

}