/*  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,

  ScrollPane, TabbedPane, Component, Swing}

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

import java.lang.System

import java.awt.BorderLayout

import javax.swing.JList

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

import org.gjt.sp.jedit.View

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[String])

  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.session.cancel_execution }

  }

  cancel.tooltip = "Cancel current proof checking process"

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

    reactions +=

    {

      case ButtonClicked(_) =>

        Isabelle.document_model(view.getBuffer) match {

          case None =>

          case Some(model) => model.full_perspective()

        }

    }

  }

  check.tooltip = "Commence full proof checking of current buffer"

  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, String] = Map.empty

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

  {

    Swing_Thread.now {

      // FIXME correlation to changed_nodes!?

      val state = Isabelle.session.current_state()

      val version = state.recent_stable.version.get_finished

      var nodes_status1 = nodes_status

      for {

        name <- changed_nodes

        node <- version.nodes.get(name)

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

      } nodes_status1 += (name -> status.toString)

      if (nodes_status != nodes_status1) {

        nodes_status = nodes_status1

        val order =

          Library.sort_wrt((name: Document.Node.Name) => name.theory,

            nodes_status.keySet.toList)

        status.listData = order.map(name => name.theory + " " + nodes_status(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

  }

}