var RegionList = (function(){

  var RegionList = {}
  var regions = RegionList.regions

  RegionList.build = function(){
    var segments = RegionList.getSortedSegments()

    // loop over them from left to right
//    console.log(segments.map(function(s){ return s.toString() }).join("\n"))

    var rooms = []
    var open_segments = []
    
    var segment, open_segment, y_segments

    for (var i = 0; i < segments.length; i++) {
      segment = segments[i]
      if (! isVertical(segment)) {
        continue
      }
      for (var j = 0; j < open_segments.length; j++) {
        open_segment = open_segments[j]
        if (segment.y.overlaps(open_segment.y)) {
          // if we have overlap, it means we have made a full room
          
          y_segments = open_segment.y.split(segment.y)
          
          if (y_segments.length == 1) {
            open_segment.x.b = segment.x.b
            rooms.push(open_segment)
          }
          
//           other_side = clone_segment(open_segment)
//           other_side[0].a = segment[0].a
//           other_side[1].a = segment[1].a
//           rooms.push([open_segment, other_side])
          open_segments.splice(j, 1)
          j--
        }
      }
      open_segments.push(segment) 
    }
    
//    console.log(rooms.map(function(s){ return s[0][0].toString() + " " + s[0][1].toString() + " " + s[1][0].toString() + " " + s[1][1].toString() }).join("\n"))
    
    return rooms
  }
  
  RegionList.getSortedSegments = function(){
    // get a list of all segments from these polylines
    var segments = shapes.getAllSegments()

    // re-orient them so they're either facing up or right and make them into rects
    segments = segments.map(function(segment){
      // vertical
      if (segment[0].a == segment[1].a) {
        if (segment[0].b > segment[1].b) {
          segment.push(segment.shift())
        }
      }
      // horizontal
      else if (segment[0].b == segment[1].b) {
        if (segment[0].a > segment[1].a) {
          segment.push(segment.shift())
        }
      }
      return new Rect( segment[0].a, segment[0].b, segment[1].a, segment[1].b )
    })
    
    return sort.rects_by_position(segments)
  }

  return RegionList
  
})()