/*

 * Main Isabelle/jEdit plugin setup

 *

 * @author Johannes Hölzl, TU Munich

 * @author Fabian Immler, TU Munich

 */

package isabelle.jedit

import java.io.{FileInputStream, IOException}

import java.awt.Font

import javax.swing.JScrollPane

import scala.collection.mutable

import isabelle.prover.{Prover, Command}

import isabelle.IsabelleSystem

import org.gjt.sp.jedit.{jEdit, EBMessage, EBPlugin, Buffer, EditPane, ServiceManager, View}

import org.gjt.sp.jedit.buffer.JEditBuffer

import org.gjt.sp.jedit.textarea.JEditTextArea

import org.gjt.sp.jedit.msg.{EditPaneUpdate, PropertiesChanged}

object Isabelle {

  // name

  val NAME = "Isabelle"

  val VFS_PREFIX = "isabelle:"

  // properties

  object Property {

    private val OPTION_PREFIX = "options.isabelle."

    def apply(name: String) = jEdit.getProperty(OPTION_PREFIX + name)

    def update(name: String, value: String) = jEdit.setProperty(OPTION_PREFIX + name, value)

  }

  // Isabelle system instance

  var system: IsabelleSystem = null

  def symbols = system.symbols

  lazy val completion = new Completion + symbols

  // settings

  def default_logic = {

    val logic = Isabelle.Property("logic")

    if (logic != null) logic else Isabelle.system.getenv_strict("ISABELLE_LOGIC")

  }

  // plugin instance

  var plugin: Plugin = null

  // running provers

  def prover_setup(buffer: JEditBuffer) = plugin.prover_setup(buffer)

}

class Plugin extends EBPlugin {

  // Isabelle font

  var font: Font = null

  val font_changed = new EventBus[Font]

  def set_font(path: String, size: Float) {

    font = Font.createFont(Font.TRUETYPE_FONT, new FileInputStream(path)).

      deriveFont(Font.PLAIN, size)

    font_changed.event(font)

  }

  /* unique ids */  // FIXME specific to "session" (!??)

  private var id_count: BigInt = 0

  def id() : String = synchronized { id_count += 1; "editor:" + id_count }

  // mapping buffer <-> prover

  private val mapping = new mutable.HashMap[JEditBuffer, ProverSetup]

  private def install(view: View) {

    val buffer = view.getBuffer

    val prover_setup = new ProverSetup(buffer)

    mapping.update(buffer, prover_setup)

    prover_setup.activate(view)

  }

  private def uninstall(view: View) =

    mapping.removeKey(view.getBuffer).get.deactivate

  def switch_active (view : View) =

    if (mapping.isDefinedAt(view.getBuffer)) uninstall(view)

    else install(view)

  def prover_setup (buffer : JEditBuffer) : Option[ProverSetup] = mapping.get(buffer)

  def is_active (buffer : JEditBuffer) = mapping.isDefinedAt(buffer)

  // main plugin plumbing

  override def handleMessage(msg: EBMessage) = msg match {

    case epu: EditPaneUpdate => epu.getWhat match {

      case EditPaneUpdate.BUFFER_CHANGED =>

        mapping get epu.getEditPane.getBuffer match {

          //only activate 'isabelle'-buffers!

          case None =>

          case Some(prover_setup) => 

            prover_setup.theory_view.activate

            val dockable = epu.getEditPane.getView.getDockableWindowManager.getDockable("isabelle-output")

            if (dockable != null) {

              val output_dockable = dockable.asInstanceOf[OutputDockable]

              if (output_dockable.getComponent(0) != prover_setup.output_text_view ) {

                output_dockable.asInstanceOf[OutputDockable].removeAll

                output_dockable.asInstanceOf[OutputDockable].add(new JScrollPane(prover_setup.output_text_view))

                output_dockable.revalidate

              }

            }

        }

      case EditPaneUpdate.BUFFER_CHANGING =>

        val buffer = epu.getEditPane.getBuffer

        if (buffer != null) mapping get buffer match {

          //only deactivate 'isabelle'-buffers!

          case None =>

          case Some(prover_setup) => prover_setup.theory_view.deactivate

        }

      case _ =>

    }

    case _ =>

  }

  override def start() {

    Isabelle.system = new IsabelleSystem

    Isabelle.plugin = this

    if (Isabelle.Property("font-path") != null && Isabelle.Property("font-size") != null)

      try {

        set_font(Isabelle.Property("font-path"), Isabelle.Property("font-size").toFloat)

      }

      catch {

        case e: NumberFormatException =>

      }

  }

  override def stop() {

    // TODO: proper cleanup

    Isabelle.system = null

    Isabelle.plugin = null

  }

}