/*
   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

object Plot{

  // [x] 1) function with all all specified 
  // [ ] 2) function with auto y bounds
  // [ ] 3) y data only, auto y range, and downsample/clobber to fit within 100px in chars along auto x range to length of group
  def apply[A,B](f: A => B, xrange:Bound[A], yrange:Bound[B])(implicit bx:Bound.Boundable[A], by:Bound.Boundable[B]) =
    PlotFunction(f,xrange,yrange)

  def apply[A,B](xys:Seq[(A,B)])(implicit bx:Bound.Boundable[A], by:Bound.Boundable[B]) = {
    val xbound = Bound.find(xys.map{_._1}).require("Bound does not exist for x axis to Plot")
    val ybound = Bound.find(xys.map{_._2}).require("Bound does not exist for y axis to Plot")
    val scale = Scale(xys:_*)
    PlotFunction(scale.apply, xbound*1.1, ybound*1.1)
  }
  def println[A,B](xys:Seq[(A,B)])(implicit aBound:Bound.Boundable[A],bBound:Bound.Boundable[B]):Unit = { val func   = Scale(xys:_*)
    val xBound = Bound.find(xys.map{_._1}).get
    val yBound = Bound.find(xys.map{_._2}).get*1.1
    System.out.println(Plot(func.apply, xBound, yBound).ascii('*'))
  }

}
case class PlotFunction[A,B](f: A => B, xrange:Bound[A], yrange:Bound[B])(implicit bx:Bound.Boundable[A], by:Bound.Boundable[B]){
  override def toString = ascii('*')
  def ascii(mark:Char, size:Vec = Vec(100,30)):String = {
    val ydomain = Bound(0,size.y.toInt)
    val yscale = yrange --> ydomain
    val spaces = Vector.fill(ydomain.max)(' ')
    val rows = xrange.take(size.x.toInt).map{x =>
      val y = yscale(f(x))
      spaces.updated(y, mark).reverse
    }
    val table = rows.transpose.map{_.mkString}.mkString("\n")
    f"${yrange.max}%-100s\n$table\n${xrange.max}%100s"
  }
}