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/*
   Copyright 2010 Aaron J. Radke

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
package cc.drx.p5.gui

import cc.drx.p5._
import processing.core._
import processing.core.PConstants._
import processing.core.PApplet._

import cc.drx._

object Menu{
   trait Item[A]{
      val menu:Menu[A]
      val pos:Vec
      val i:Int
      val isSelected:Boolean
      val value:A
      def isHover(mouse:Vec):Boolean
   }
   def apply[A](title:String, origin:Vec, w:Int, items:Seq[A]=Seq(), fieldHeight:Double=30d) = new Menu(title, origin,w,items,fieldHeight)
}
class Menu[A](val title:String, var origin:Vec, w:Int,var items:Seq[A]=Seq(), fieldHeight:Double) extends Traversable[Menu.Item[A]]{
   import P5._

   private var hidden = false
   def isHidden = hidden
   def isVisible = !hidden
   def show:Menu[A] = {hidden = false; this}
   def hide:Menu[A] = {hidden = true; this}
   def toggle:Menu[A] = {hidden = !hidden; this} //toggle visibility

   var scrollOffset:Int = 0

   var selected:Set[Int] = Set()
   def toggleSelection(i:Int):Unit = if(selected contains i) selected -= i else selected += i
   def selectAll:Unit = selected = allIndices

   private def allIndices:Set[Int] = (0 to (items.size-1)).toSet

   def selectedItems:Seq[A] = selected.toSeq map {items.apply}
   var hiddenIndices:Set[Int] = Set()
   def visibleIndices_=(visible:Set[Int]) = hiddenIndices = allIndices -- visible
   def visibleIndices:Set[Int] = allIndices -- hiddenIndices

   def contains(mouse:Vec):Boolean = {
      !hidden &&
      origin.x < mouse.x && 
      mouse.x < origin.x + w &&
      origin.y < mouse.y && 
      mouse.y < (origin.y + yOfIndex(items.size) - scrollOffset)
   }
   def valueAt(mouse:Vec):Option[A] = indexAt(mouse) map items.apply

   def indexAt(mouse:Vec):Option[Int] = if(hidden) None else {
      if(inXRange(mouse)){
         val j = ((mouse.y- origin.y - scrollOffset)/fieldHeight).toInt
         if(hiddenIndices.isEmpty) if(j < 0 || j >= items.size) None else Some(j)
         else (0 until items.size) filterNot hiddenIndices lift j  //really inefficient way of computing this, but it works
      } else None
   }
   private def yOfIndex(i:Int):Double = origin.y + scrollOffset + i*fieldHeight
   private def inXRange(mouse:Vec) = origin.x < mouse.x && mouse.x < origin.x + w

   def foreach[U](f:Menu.Item[A]=>U):Unit = if(!hidden){
     var j = 0
     for((item,i) <- items.zipWithIndex if hiddenIndices doesNotContain i){
        val yt = yOfIndex(j)
        val pos = Vec(origin.x, yt + fieldHeight/2)
        f(MenuItem(pos,i,selected(i)))
        j += 1
     }
   }
   private val thisMenu = this
   case class MenuItem(pos:Vec, i:Int, isSelected:Boolean) extends Menu.Item[A]{
      val value = items(i)
      val menu = thisMenu
      def isHover(mouse:Vec):Boolean = {
         val inX = inXRange(mouse)
         val f2 = fieldHeight/2
         val inY = pos.y-f2 < mouse.y && mouse.y < pos.y+f2
         inX && inY
      }
   }

   @deprecated("use the more general foreach(mouse)(f:Menu.Item=>Unit)","v0.1.10")
   def draw(onHover:Int=>Unit=(_:Int)=>{})(implicit pg:P5):Unit = {
      pg.textAlign(LEFT,CENTER)
      foreach{m => 
         pg.fill(if(m isHover pg.mouse) Yellow else if(m.isSelected) Red else White)
         pg.text(m.value.toString, m.pos.x, m.pos.y)
      }
   }
      
}