/*  Title:      Pure/ML/ml_statistics.ML

    Author:     Makarius

ML runtime statistics.

*/

package isabelle

import scala.collection.immutable.{SortedSet, SortedMap}

import scala.swing.{Frame, Component}

import org.jfree.data.xy.{XYSeries, XYSeriesCollection}

import org.jfree.chart.{JFreeChart, ChartPanel, ChartFactory}

import org.jfree.chart.plot.PlotOrientation

object ML_Statistics

{

  /* content interpretation */

  final case class Entry(time: Double, data: Map[String, Double])

  def apply(stats: List[Properties.T]): ML_Statistics = new ML_Statistics(stats)

  def apply(path: Path): ML_Statistics = apply(Build.parse_log(File.read_gzip(path)).stats)

  val empty = apply(Nil)

  /* standard fields */

  val GC_fields = ("GCs", List("partial_GCs", "full_GCs"))

  val heap_fields =

    ("Heap", List("size_heap", "size_allocation", "size_allocation_free",

      "size_heap_free_last_full_GC", "size_heap_free_last_GC"))

  val threads_fields =

    ("Threads", List("threads_total", "threads_in_ML", "threads_wait_condvar",

      "threads_wait_IO", "threads_wait_mutex", "threads_wait_signal"))

  val time_fields =

    ("Time", List("time_GC_system", "time_GC_user", "time_non_GC_system", "time_non_GC_user"))

  val tasks_fields =

    ("Future tasks",

      List("tasks_proof", "tasks_ready", "tasks_pending", "tasks_running", "tasks_passive"))

  val workers_fields =

    ("Worker threads", List("workers_total", "workers_active", "workers_waiting"))

  val standard_fields =

    List(GC_fields, heap_fields, threads_fields, time_fields, tasks_fields, workers_fields)

}

final class ML_Statistics private(val stats: List[Properties.T])

{

  val Now = new Properties.Double("now")

  def now(props: Properties.T): Double = Now.unapply(props).get

  require(stats.forall(props => Now.unapply(props).isDefined))

  val time_start = if (stats.isEmpty) 0.0 else now(stats.head)

  val duration = if (stats.isEmpty) 0.0 else now(stats.last) - time_start

  val fields: Set[String] =

    SortedSet.empty[String] ++

      (for (props <- stats.iterator; (x, _) <- props.iterator if x != Now.name)

        yield x)

  val content: List[ML_Statistics.Entry] =

    stats.map(props => {

      val time = now(props) - time_start

      require(time >= 0.0)

      val data =

        SortedMap.empty[String, Double] ++

          (for ((x, y) <- props.iterator if x != Now.name)

            yield (x, java.lang.Double.parseDouble(y)))

      ML_Statistics.Entry(time, data)

    })

  /* charts */

  def update_data(data: XYSeriesCollection, selected_fields: Iterable[String])

  {

    data.removeAllSeries

    for {

      field <- selected_fields.iterator

      series = new XYSeries(field)

    } {

      content.foreach(entry => series.add(entry.time, entry.data(field)))

      data.addSeries(series)

    }

  }

  def chart(title: String, selected_fields: Iterable[String]): JFreeChart =

  {

    val data = new XYSeriesCollection

    update_data(data, selected_fields)

    ChartFactory.createXYLineChart(title, "time", "value", data,

      PlotOrientation.VERTICAL, true, true, true)

  }

  def chart(arg: (String, Iterable[String])): JFreeChart = chart(arg._1, arg._2)

  def standard_frames: Unit =

    ML_Statistics.standard_fields.map(chart(_)).foreach(c =>

      Swing_Thread.later {

        new Frame {

          iconImage = Isabelle_System.get_icon().getImage

          title = "ML statistics"

          contents = Component.wrap(new ChartPanel(c))

          visible = true

        }

      })

}