/*  Title:      Tools/jEdit/src/session_dockable.scala

    Author:     Makarius

Dockable window for prover session management.

*/

package isabelle.jedit

import isabelle._

import scala.actors.Actor._

import scala.swing.{FlowPanel, Button, TextArea, Label, ListView, Alignment,

  ScrollPane, TabbedPane, Component, Swing}

import scala.swing.event.{ButtonClicked, SelectionChanged}

import java.lang.System

import java.awt.{BorderLayout, Graphics2D, Insets}

import javax.swing.{JList, DefaultListCellRenderer, BorderFactory}

import javax.swing.border.{BevelBorder, SoftBevelBorder}

import org.gjt.sp.jedit.{View, jEdit}

class Session_Dockable(view: View, position: String) extends Dockable(view: View, position: String)

{

  /* main tabs */

  private val readme = new HTML_Panel("SansSerif", 14)

  readme.render_document(Isabelle_System.try_read(List(Path.explode("$JEDIT_HOME/README.html"))))

  val status = new ListView(Nil: List[Document.Node.Name])

  status.peer.setLayoutOrientation(JList.VERTICAL_WRAP)

  status.selection.intervalMode = ListView.IntervalMode.Single

  private val syslog = new TextArea(Isabelle.session.syslog())

  private val tabs = new TabbedPane {

    pages += new TabbedPane.Page("README", Component.wrap(readme))

    pages += new TabbedPane.Page("Theory Status", new ScrollPane(status))

    pages += new TabbedPane.Page("System Log", new ScrollPane(syslog))

    selection.index =

    {

      val index = Isabelle.Int_Property("session-panel.selection", 0)

      if (index >= pages.length) 0 else index

    }

    listenTo(selection)

    reactions += {

      case SelectionChanged(_) =>

        Isabelle.Int_Property("session-panel.selection") = selection.index

    }

  }

  set_content(tabs)

  /* controls */

  val session_phase = new Label(Isabelle.session.phase.toString)

  session_phase.border = new SoftBevelBorder(BevelBorder.LOWERED)

  session_phase.tooltip = "Prover status"

  private val cancel = new Button("Cancel") {

    reactions += { case ButtonClicked(_) => Isabelle.cancel_execution() }

  }

  cancel.tooltip = jEdit.getProperty("isabelle.cancel-execution.label")

  private val check = new Button("Check") {

    reactions += { case ButtonClicked(_) => Isabelle.check_buffer(view.getBuffer) }

  }

  check.tooltip = jEdit.getProperty("isabelle.check-buffer.label")

  private val logic = Isabelle.logic_selector(Isabelle.Property("logic"))

  logic.listenTo(logic.selection)

  logic.reactions += {

    case SelectionChanged(_) => Isabelle.Property("logic") = logic.selection.item.name

  }

  private val controls =

    new FlowPanel(FlowPanel.Alignment.Right)(check, cancel, session_phase, logic)

  add(controls.peer, BorderLayout.NORTH)

  /* component state -- owned by Swing thread */

  private var nodes_status: Map[Document.Node.Name, Isar_Document.Node_Status] = Map.empty

  private object Node_Renderer_Component extends Label

  {

    opaque = false

    xAlignment = Alignment.Leading

    border = BorderFactory.createEmptyBorder(2, 2, 2, 2)

    var node_name = Document.Node.Name.empty

    override def paintComponent(gfx: Graphics2D)

    {

      nodes_status.get(node_name) match {

        case Some(st) if st.total > 0 =>

          val size = peer.getSize()

          val insets = border.getBorderInsets(this.peer)

          val w = size.width - insets.left - insets.right

          val h = size.height - insets.top - insets.bottom

          var end = size.width - insets.right

          for {

            (n, color) <- List(

              (st.unprocessed, Isabelle_Markup.unprocessed1_color),

              (st.running, Isabelle_Markup.running_color),

              (st.failed, Isabelle_Markup.error_color)) }

          {

            gfx.setColor(color)

            val v = (n * w / st.total) max (if (n > 0) 2 else 0)

            gfx.fillRect(end - v, insets.top, v, h)

            end -= v

          }

        case _ =>

      }

      super.paintComponent(gfx)

    }

  }

  private class Node_Renderer extends ListView.Renderer[Document.Node.Name]

  {

    def componentFor(list: ListView[_], isSelected: Boolean, focused: Boolean,

      name: Document.Node.Name, index: Int): Component =

    {

      val component = Node_Renderer_Component

      component.node_name = name

      component.text = name.theory

      component

    }

  }

  status.renderer = new Node_Renderer

  private def handle_changed(changed_nodes: Set[Document.Node.Name])

  {

    Swing_Thread.now {

      // FIXME correlation to changed_nodes!?

      val snapshot = Isabelle.session.snapshot()

      var nodes_status1 = nodes_status

      for {

        name <- changed_nodes

        node <- snapshot.version.nodes.get(name)

        val status = Isar_Document.node_status(snapshot.state, snapshot.version, node)

      } nodes_status1 += (name -> status)

      if (nodes_status != nodes_status1) {

        nodes_status = nodes_status1

        status.listData =

          snapshot.version.topological_order.filter(

            (name: Document.Node.Name) => nodes_status.isDefinedAt(name))

      }

    }

  }

  /* main actor */

  private val main_actor = actor {

    loop {

      react {

        case result: Isabelle_Process.Result =>

          if (result.is_syslog)

            Swing_Thread.now {

              val text = Isabelle.session.syslog()

              if (text != syslog.text) {

                syslog.text = text

              }

            }

        case phase: Session.Phase =>

          Swing_Thread.now { session_phase.text = " " + phase.toString + " " }

        case changed: Session.Commands_Changed => handle_changed(changed.nodes)

        case bad => System.err.println("Session_Dockable: ignoring bad message " + bad)

      }

    }

  }

  override def init() {

    Isabelle.session.syslog_messages += main_actor

    Isabelle.session.phase_changed += main_actor

    Isabelle.session.commands_changed += main_actor

  }

  override def exit() {

    Isabelle.session.syslog_messages -= main_actor

    Isabelle.session.phase_changed -= main_actor

    Isabelle.session.commands_changed -= main_actor

  }

}