/*  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, MouseClicked, 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]) {

     listenTo(mouse.clicks)

     reactions += {

       case MouseClicked(_, point, _, clicks, _) if clicks == 2 =>

         val index = peer.locationToIndex(point)

         if (index >= 0) jEdit.openFile(view, listData(index).node)

     }

   }

   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

   }

 }