// Tool used to move corners of polylines

var ArrowTool = MapTool.extend(function(base){
	var exports = {}
	
	var selected_point = null, selected_segment = null, original_point = null, selected_shape = null
	var src_points, dest_points
	
	exports.down = function(e, cursor){
    last_point.a = cursor.x.a
    last_point.b = cursor.y.a
    var p = shapes.findClosestPoint(last_point)
    if (p && p.shape.type() !== "ortho") {
      selected_shape = p.shape
      selected_point = p.point
      original_point = selected_point.clone()
      return
    }
    var segment = shapes.findClosestSegment(last_point)
    if (segment) {
      document.body.style.cursor = "pointer"

      selected_segment = segment
      console.log(segment.head, segment.tail)
      selected_shape = segment.shape
      src_points = segment.shape.cloneSegment( segment )
      dest_points = segment.shape.getSegment( segment )

      last_point.a = segment.x
      last_point.b = segment.y
      cursor.x.a = cursor.x.b = last_point.a
      cursor.y.a = cursor.y.b = last_point.b
    }
    else {
      map.ui.set_drag_tool("position")
    }
	}
	
  exports.move = function(e, cursor){
    last_point.a = cursor.x.a
    last_point.b = cursor.y.a
    var p = shapes.findClosestPoint(last_point)
    if (p) {
      document.body.style.cursor = "pointer"
      last_point.assign(p.point)
      cursor.x.a = cursor.x.b = last_point.a
      cursor.y.a = cursor.y.b = last_point.b
      return
    }
    var segment = shapes.findClosestSegment(last_point)
    if (segment) {
      document.body.style.cursor = "pointer"
      last_point.a = segment.x
      last_point.b = segment.y
      cursor.x.a = cursor.x.b = last_point.a
      cursor.y.a = cursor.y.b = last_point.b
    }
    else {
      document.body.style.cursor = "crosshair"
    }
	}
	
	exports.drag = function(e, cursor){
	  if (selected_point) {
      selected_point.a = original_point.a + cursor.x.magnitude()
      selected_point.b = original_point.b + cursor.y.magnitude()
      selected_shape.rebuild()
	  }
	  else if (selected_segment) {
	    selected_shape.translateSegment(
	      src_points, dest_points,
	      cursor.x.magnitude(), cursor.y.magnitude()
	    ) 
      selected_shape.rebuild()
	  }
	}
	
	exports.up = function(e, cursor){
	  selected_point = selected_shape = selected_segment = original_point = null
	}
	
	return exports
})