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

    Author:     Makarius

Dockable window for theories managed by prover.

*/

package isabelle.jedit

import isabelle._

import scala.actors.Actor._

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

  ScrollPane, Component, CheckBox, BorderPanel}

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

import java.lang.System

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

import javax.swing.{JList, BorderFactory}

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

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

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

{

  /* status */

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

    listenTo(mouse.clicks)

    reactions += {

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

        val index = peer.locationToIndex(point)

        if (index >= 0 && Node_Renderer_Component != null) {

          Node_Renderer_Component.checkbox_geometry match {

            case Some((loc, size)) =>

              val loc0 = peer.indexToLocation(index)

              val in_checkbox =

                loc0.x + loc.x <= point.x && point.x < loc0.x + size.width &&

                loc0.y + loc.y <= point.y && point.y < loc0.y + size.height

              if (clicks == 1 && in_checkbox) {

                for {

                  buffer <- JEdit_Lib.jedit_buffer(listData(index).node)

                  model <- PIDE.document_model(buffer)

                } model.node_required = !model.node_required

              }

              if (clicks == 2 && !in_checkbox)

                Hyperlink(listData(index).node).follow(view)

            case None =>

          }

        }

    }

  }

  status.peer.setLayoutOrientation(JList.HORIZONTAL_WRAP)

  status.peer.setVisibleRowCount(0)

  status.selection.intervalMode = ListView.IntervalMode.Single

  set_content(new ScrollPane(status))

  /* controls */

  def phase_text(phase: Session.Phase): String =

    "Prover: " + Library.lowercase(phase.toString)

  private val session_phase = new Label(phase_text(PIDE.session.phase))

  session_phase.border = new SoftBevelBorder(BevelBorder.LOWERED)

  session_phase.tooltip = "Status of prover session"

  private def handle_phase(phase: Session.Phase)

  {

    Swing_Thread.later { session_phase.text = " " + phase_text(phase) + " " }

  }

  private val continuous_checking = new CheckBox("Continuous checking") {

    tooltip = "Continuous checking of proof document (visible and required parts)"

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

    def load() { selected = Isabelle.continuous_checking }

    load()

  }

  private val logic = Isabelle_Logic.logic_selector(true)

  private val controls =

    new FlowPanel(FlowPanel.Alignment.Right)(continuous_checking, session_phase, logic)

  add(controls.peer, BorderLayout.NORTH)

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

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

  private var nodes_required: Set[Document.Node.Name] = Set.empty

  private def update_nodes_required()

  {

    nodes_required = Set.empty

    for {

      buffer <- JEdit_Lib.jedit_buffers

      model <- PIDE.document_model(buffer)

      if model.node_required

    } nodes_required += model.name

  }

  private object Node_Renderer_Component extends BorderPanel

  {

    opaque = false

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

    var node_name = Document.Node.Name.empty

    var checkbox_geometry: Option[(Point, Dimension)] = None

    val checkbox = new CheckBox {

      override def paintComponent(gfx: Graphics2D)

      {

        super.paintComponent(gfx)

        if (location != null && size != null)

          checkbox_geometry = Some((location, size))

      }

    }

    val label = new Label {

      opaque = false

      xAlignment = Alignment.Leading

      override def paintComponent(gfx: Graphics2D)

      {

        val size = peer.getSize()

        val insets = border.getBorderInsets(peer)

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

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

        nodes_status.get(node_name) match {

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

            val colors = List(

              (st.unprocessed, PIDE.options.color_value("unprocessed1_color")),

              (st.running, PIDE.options.color_value("running_color")),

              (st.warned, PIDE.options.color_value("warning_color")),

              (st.failed, PIDE.options.color_value("error_color")))

            var end = size.width - insets.right

            for { (n, color) <- colors }

            {

              gfx.setColor(color)

              val v = (n * (w - colors.length) / st.total) max (if (n > 0) 4 else 0)

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

              end = end - v - 1

            }

          case _ =>

            gfx.setColor(PIDE.options.color_value("unprocessed1_color"))

            gfx.fillRect(insets.left, insets.top, w, h)

        }

        super.paintComponent(gfx)

      }

    }

    layout(checkbox) = BorderPanel.Position.West

    layout(label) = BorderPanel.Position.Center

  }

  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.checkbox.selected = nodes_required.contains(name)

      component.label.text = name.theory

      component

    }

  }

  status.renderer = new Node_Renderer

  private def handle_update(restriction: Option[Set[Document.Node.Name]] = None)

  {

    Swing_Thread.now {

      val snapshot = PIDE.session.snapshot()

      val iterator =

        restriction match {

          case Some(names) => names.iterator.map(name => (name, snapshot.version.nodes(name)))

          case None => snapshot.version.nodes.entries

        }

      val nodes_status1 =

        (nodes_status /: iterator)({ case (status, (name, node)) =>

            if (PIDE.thy_load.loaded_theories(name.theory)) status

            else status + (name -> Protocol.node_status(snapshot.state, snapshot.version, node)) })

      if (nodes_status != nodes_status1) {

        nodes_status = nodes_status1

        status.listData =

          snapshot.version.nodes.topological_order.filter(

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

      }

    }

  }

  /* main actor */

  private val main_actor = actor {

    loop {

      react {

        case phase: Session.Phase => handle_phase(phase)

        case _: Session.Global_Options =>

          Swing_Thread.later {

            continuous_checking.load()

            logic.load ()

            update_nodes_required()

            status.repaint()

          }

        case changed: Session.Commands_Changed => handle_update(Some(changed.nodes))

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

      }

    }

  }

  override def init()

  {

    PIDE.session.phase_changed += main_actor; handle_phase(PIDE.session.phase)

    PIDE.session.global_options += main_actor

    PIDE.session.commands_changed += main_actor; handle_update()

  }

  override def exit()

  {

    PIDE.session.phase_changed -= main_actor

    PIDE.session.global_options -= main_actor

    PIDE.session.commands_changed -= main_actor

  }

}