/*  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 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)(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

   }

 }