//  --------------------------------------------------------------
//  SASS Gridification
//  * Author:   Chris Eppstein
//  A SASS adaptation of Blueprint CSS
//  * Version:         0.7.1 (2008-02-25)
//  * Website:         http://code.google.com/p/blueprintcss/
//  Based on work by:
//  * Lorin Tackett     [lorintackett.com]
//  * Olav Bjorkoy      [bjorkoy.com]
//  * Nathan Borror     [playgroundblues.com]
//  * Jeff Croft        [jeffcroft.com]
//  * Christian Metts   [mintchaos.com]
//  * Khoi Vinh         [subtraction.com]
//  Read more about using a grid here:
//  * http://www.subtraction.com/2007/03/18/oh-yeeaahh
//  --------------------------------------------------------------

@import compass/utilities/general/float.sass

// Main layout grid, override these constants to build your grid and container sizes.
!blueprint_grid_columns ||= 24
!blueprint_grid_width   ||= 30px
!blueprint_grid_margin  ||= 10px

!blueprint_grid_outer_width = !blueprint_grid_width + !blueprint_grid_margin
!blueprint_container_size = !blueprint_grid_outer_width * !blueprint_grid_columns - !blueprint_grid_margin


=blueprint-grid
  // A container should group all your columns
  .container
    +container
  .column, #{enumerate("div.span", 1, !blueprint_grid_columns)}
    +column-base
  // The last column in a row needs this class (or mixin) or it will end up on the next row.
  .last, div.last
    +last
  // Use these classes (or mixins) to set the width of a column.
  @for !n from 1 to !blueprint_grid_columns
    .span-#{!n}
      +span(!n)
  .span-#{!blueprint_grid_columns}, div.span-#{!blueprint_grid_columns}
    +span(!blueprint_grid_columns)
    margin: 0
  input, textarea, select
    @for !n from 1 through !blueprint_grid_columns
      &.span-#{!n}
        +span(!n, true)
  // Add these to a column to append empty cols.
  @for !n from 1 to !blueprint_grid_columns
    .append-#{!n}
      +append(!n)
  // Add these to a column to prepend empty cols.
  @for !n from 1 to !blueprint_grid_columns
    .prepend-#{!n}
      +prepend(!n)
  // Use these classes on an element to push it into the
  // next column, or to pull it into the previous column.
  #{enumerate(".pull", 1, !blueprint_grid_columns)}
    +pull-base
  @for !n from 1 through !blueprint_grid_columns
    .pull-#{!n}
      +pull-margins(!n)
  #{enumerate(".push", 1, !blueprint_grid_columns)}
    +push-base
  @for !n from 1 through !blueprint_grid_columns
    .push-#{!n}
      +push-margins(!n)
  .prepend-top
    +prepend-top
  .append-bottom
    +append-bottom


// Columns
// Note: If you use this mixin without the class and want to support ie6
//       you must set text-align left on your container element in an IE stylesheet.
=container
  width= !blueprint_container_size
  margin: 0 auto
  +clearfix

// The last column in a row needs this mixin or it will end up on the next row.
// TODO add this to span mixin when we have optional arguments
=last
  margin-right: 0

=span(!n, !override = false)
  !width = !blueprint_grid_width * !n + (!blueprint_grid_margin * (!n - 1))
  @if !override
    width= !width !important
  @else
    width= !width

=column-base(!last = false)
  +float-left
  @if !last
    +last
  @else
    margin-right= !blueprint_grid_margin
  * html &
    overflow-x: hidden

// Use this mixins to set the width of n columns.
=column(!n, !last = false)
  +column-base(!last)
  +span(!n)


// Mixin to a column to append n empty cols.
=append(!n)
  padding-right= (!blueprint_grid_outer_width) * !n

// Mixin to a column to prepend n empty cols.
=prepend(!n)
  padding-left= (!blueprint_grid_outer_width) * !n

=append-bottom(!amount = 1.5em)
  margin-bottom= !amount

=prepend-top(!amount = 1.5em)
  margin-top= !amount

=pull-base
  +float-left
  position: relative

=pull-margins(!n, !last = false)
  @if !last
    margin-left= (-!blueprint_grid_outer_width * !n) + !blueprint_grid_margin
  @else
    margin-left= -!blueprint_grid_outer_width * !n

// mixin to a column to move it n columns to the left
=pull(!n, !last = false)
  +pull-base
  +pull-margins(!n, !last)

=push-base
  +float-right
  position: relative

=push-margins(!n)
  margin= 0 (-!blueprint_grid_outer_width * !n) 1.5em (!blueprint_grid_outer_width * !n)

// mixin to a column to push it n columns to the right
=push(!n)
  +push-base
  +push-margins(!n)

// Border on right hand side of a column.
=border(!border_color = #eee, !border_width = 1px)
  padding-right= !blueprint_grid_margin / 2 - !border_width
  margin-right= !blueprint_grid_margin / 2
  border-right: #{!border_width} solid #{!border_color}

// Border with more whitespace, spans one column.
=colborder(!border_color = #eee, !border_width = 1px)
  padding-right= floor((!blueprint_grid_width + 2 * !blueprint_grid_margin - !border_width)/2)
  margin-right= ceil((!blueprint_grid_width + 2 * !blueprint_grid_margin - !border_width)/2)
  border-right: #{!border_width} solid #{!border_color}

// Mixin this to an hr to make a horizontal ruler across a column.
=colruler(!border_color = #ddd)
  background= !border_color
  color= !border_color
  clear: both
  float: none
  width: 100%
  height: .1em
  margin: 0 0 1.45em
  border: none

// Mixin this to an hr to make a horizontal spacer across a column.
=colspacer
  +colruler
  background: #fff
  color: #fff
  visibility: hidden