package 
{
  import mx.collections.ArrayCollection;
  import mx.containers.Canvas;
  import flash.events.MouseEvent;
  import mx.core.UIComponent;
  import mx.rpc.events.AbstractEvent;
  import mx.controls.Alert;
  
  public class graphic_flex_diagram_class_Designer
  {
    private var boxes:ArrayCollection = new ArrayCollection();
    private var lines:ArrayCollection = new ArrayCollection();
    private var designArea:Canvas;
    private var isDrawEnable:Boolean = false;
    private var isDrawing:Boolean = false;
    private var templateLine:graphic_flex_diagram_class_Line;
    private var currentFromBox:graphic_flex_diagram_class_Box;
    private var currentToBox:graphic_flex_diagram_class_Box;
    
    // designer is a manager class. 
    public function graphic_flex_diagram_class_Designer(){        
      templateLine = new graphic_flex_diagram_class_Line();
      templateLine.name="templateLine";
      templateLine.visible = false;
    }
    public function setIsDrawEnable(value:Boolean):void{
      this.isDrawEnable = value;
    }
    public function getIsDrawEnable():Boolean{
      return this.isDrawEnable;
    }
    public function setCurrentFromBox(value:graphic_flex_diagram_class_Box):void{
      this.currentFromBox = value;      
    }
    public function setCurrentToBox(value:graphic_flex_diagram_class_Box):void{
      this.currentToBox = value;  
    }
    public function getBoxList():ArrayCollection{
      return boxes;
    }
    public function getLineList():ArrayCollection{
      return lines;
    }
    private function getId(type:String):String{
      var idString:String  = type + Math.round(Math.random()*10000).toString();
      return idString;
    }
    
    // set design area and adding desing area events.    
    public function setDesignArea(value:Canvas):void{
      this.designArea = value;
      designArea.addChild(templateLine);      
      designArea.addEventListener(MouseEvent.MOUSE_MOVE,mouseMove);
      designArea.addEventListener(MouseEvent.MOUSE_UP,mouseUp);
    }
		// this method checks mouse up event on the box or not .
		// if not cancel drawing. 
		// if there is no excpation add lines
		public function mouseUp(event:MouseEvent):void{
      if (isDrawEnable){
        try{
          if (graphic_flex_diagram_class_Box(event.currentTarget)!= null){
            addLine();
          }                  
        }
        catch(e:Error){
            cancelDrawing();          
        }        
      }      
    }
    //when mouse move on the design area drawing template line if isDrawing true
    public function mouseMove(event:MouseEvent):void{
      if (isDrawing){
        drawLine();  
      }
    }
    // create box 
    public function addBox(x:int, y:int):void{
      var newBox:graphic_flex_diagram_class_Box = new graphic_flex_diagram_class_Box();
      var id:String = getId("Box");
      newBox.setDesigner(this);
      newBox.create(x,y,id);
      boxes.addItem(newBox);     
      designArea.addChild(newBox);
    } 
    // this method works when mouse down on the box 
    // it sets first point coordinae of template line
    public function prepareDrawing():void{    
      if (isDrawEnable){
        templateLine.graphics.clear();
        templateLine.setX1(designArea.mouseX);
        templateLine.setY1(designArea.mouseY);
        templateLine.visible = true;
        isDrawing = true;      
      }  
    }
    // this methods set second coordinate of template line and draw
    public function drawLine():void{   
      if (isDrawing){
        templateLine.setX2(designArea.mouseX);
        templateLine.setY2(designArea.mouseY);
        templateLine.draw();
      }
    }
    
    // this methods create new line and add line to box and designer
    public function addLine():void{ 
      if (isDrawing){
        var newLine:graphic_flex_diagram_class_Line = new graphic_flex_diagram_class_Line();
        newLine.setId(getId("Line"));
        newLine.setFromBox(currentFromBox);
        newLine.setToBox(currentToBox);
        newLine.draw();        
        currentFromBox.addFromLine(newLine);
        currentToBox.addToLine(newLine);          
        lines.addItem(newLine);
        designArea.addChild(newLine);
        templateLine.visible = false;        
        isDrawEnable = false;
        isDrawing = false;        
      }
      else{
        cancelDrawing();
      }
    }
    // this methods cancel drawing
    public function cancelDrawing():void{
      templateLine.visible = false;
      isDrawEnable = false;
      isDrawing = false;
    }
  }
}