//
// Mixins
// --------------------------------------------------


// UTILITY MIXINS
// --------------------------------------------------

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

// Webkit-style focus
// ------------------
.tab-focus() {
  // Default
  outline: thin dotted #333;
  // Webkit
  outline: 5px auto -webkit-focus-ring-color;
  outline-offset: -2px;
}

// FORMS
// --------------------------------------------------

// Mixin for form field states
.formFieldState(@textColor: #555, @borderColor: #ccc, @backgroundColor: #f5f5f5) {
  // Set the text color
  > label,
  .help-block,
  .help-inline {
    color: @textColor;
  }
  // Style inputs accordingly
  .checkbox,
  .radio,
  input,
  select,
  textarea {
    color: @textColor;
    border-color: @borderColor;
    box-shadow: inset 0 1px 1px rgba(0,0,0,.075); // Redeclare so transitions work
    &:focus {
      border-color: darken(@borderColor, 10%);
      // Write out in full since the lighten() function isn't easily escaped
      box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@borderColor, 20%);
    }
  }
  // Give a small background color for input-prepend/-append
  .input-prepend .add-on,
  .input-append .add-on {
    color: @textColor;
    background-color: @backgroundColor;
    border-color: @textColor;
  }
}



// BACKGROUNDS
// --------------------------------------------------

// Gradient Bar Colors for buttons and alerts
.gradientBar(@primaryColor, @secondaryColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) {
  color: @textColor;
  text-shadow: @textShadow;
  #gradient > .vertical(@primaryColor, @secondaryColor);
  border-color: @secondaryColor @secondaryColor darken(@secondaryColor, 15%);
  border-color: rgba(0,0,0,.1) rgba(0,0,0,.1) fadein(rgba(0,0,0,.1), 15%);
}

// Gradients
#gradient {
  .vertical(@startColor: #555, @endColor: #333) {
    background-color: mix(@startColor, @endColor, 60%);
    background-image: linear-gradient(to bottom, @startColor, @endColor); // Standard, IE10
    background-repeat: repeat-x;
  }
}



// COMPONENT MIXINS
// --------------------------------------------------

// Horizontal dividers
// -------------------------
// Dividers (basically an hr) within dropdowns and nav lists
.nav-divider(@top: #e5e5e5, @bottom: @white) {
  height: 1px;
  margin: ((@baseLineHeight / 2) - 1) 1px; // 8px 1px
  overflow: hidden;
  background-color: @top;
  border-bottom: 1px solid @bottom;
}

// Button backgrounds
// ------------------
.buttonBackground(@startColor, @endColor, @textColor: #fff, @textShadow: 0 -1px 0 rgba(0,0,0,.25)) {
  color: @textColor;
  text-shadow: @textShadow;
  #gradient > .vertical(@startColor, @endColor);
  border-color: @endColor @endColor darken(@endColor, 15%);
  border-color: rgba(0,0,0,.1) rgba(0,0,0,.1) fadein(rgba(0,0,0,.1), 15%);

  // in these cases the gradient won't cover the background, so we override
  &:hover, &:active, &.active, &.disabled, &[disabled] {
    color: @textColor;
    background-color: @endColor;
  }
}

// Grid System
// -----------

// 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
}

// The Grid
#grid {

  .core (@gridColumnWidth, @gridGutterWidth) {

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

    .offsetX (@index) when (@index > 0) {
//      (~".offset@{index}") { .offset(@index); }
      .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;
      margin-left: @gridGutterWidth;
    }

    // Set the container width
    .container { .span(@gridColumns); }

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

  }

  .fluid (@fluidGridColumnWidth, @fluidGridGutterWidth) {

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

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

    .offsetFirstChild (@columns) {
      margin-left: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1)) + (@fluidGridGutterWidth);
    }

    .span (@columns) {
      width: (@fluidGridColumnWidth * @columns) + (@fluidGridGutterWidth * (@columns - 1));
    }

    .row-fluid {
      width: 100%;
      .clearfix();
      [class*="span"] {
        display: block;
        width: 100%;
        min-height: 30px;        // Make inputs at least the height of their button counterpart
        box-sizing: border-box; // Makes inputs behave like true block-level elements
        float: left;
        margin-left: @fluidGridGutterWidth;
      }
      [class*="span"]:first-child {
        margin-left: 0;
      }

      // 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); }
      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);

  }

}