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/*
 * Copyright (C) 2016  University of Basel, Graphics and Vision Research Group
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package scalismo.ui.model

import java.io.File

import scalismo.geometry._3D
import scalismo.image.DiscreteImage
import scalismo.io.ImageIO
import scalismo.ui.model.capabilities._
import scalismo.ui.model.properties._
import scalismo.ui.util.{FileIoMetadata, FileUtil}

import scala.util.{Failure, Success, Try}

class ImagesNode(override val parent: GroupNode) extends SceneNodeCollection[ImageNode] with Loadable {
  override val name: String = "Images"

  def add(image: DiscreteImage[_3D, Float], name: String): ImageNode = {
    val node = new ImageNode(this, image, name)
    add(node)
    node
  }

  override def loadMetadata: FileIoMetadata = FileIoMetadata.Image

  override def load(file: File): Try[Unit] = {
    ImageIO.read3DScalarImageAsType[Float](file) match {
      case Success(image) =>
        add(image, FileUtil.basename(file))
        Success(())
      case Failure(ex) => Failure(ex)
    }
  }
}

class ImageNode(override val parent: ImagesNode, val source: DiscreteImage[_3D, Float], initialName: String)
    extends RenderableSceneNode
    with Grouped
    with Renameable
    with Saveable
    with Removeable
    with HasWindowLevel
    with HasOpacity {
  name = initialName

  val (minimumValue, maximumValue) = {
    // we manually do this instead of using the min or max methods of the iterator
    // so that we only have to run through the list once.
    var min: Float = Float.MaxValue
    var max: Float = Float.MinValue
    source.values.foreach { value =>
      min = Math.min(min, value)
      max = Math.max(max, value)
    }
    (min, max)
  }

  override def saveMetadata: FileIoMetadata = FileIoMetadata.Image

  override def save(file: File): Try[Unit] = {
    val ext = FileUtil.extension(file)
    ext match {
      case "vtk" => ImageIO.writeVTK(source, file)
      case "nii" => ImageIO.writeNifti(source, file)
      case _     => Failure(new Exception(s"File $file: unsupported file extension"))
    }

  }

  override val windowLevel: WindowLevelProperty = {
    val range = maximumValue - minimumValue
    val window = Math.round(range * 0.75f)
    val level = Math.round(minimumValue + range / 2.0f)
    new WindowLevelProperty(WindowLevel(window, level))
  }

  override val opacity: OpacityProperty = new OpacityProperty()

  override def group: GroupNode = parent.parent

  override def remove(): Unit = parent.remove(this)
}