/*

 * Main Isabelle/jEdit plugin setup

 *

 * @author Johannes Hölzl, TU Munich

 * @author Fabian Immler, TU Munich

 * @author Makarius

 */

package isabelle.jedit

import java.io.{FileInputStream, IOException}

import java.awt.Font

import javax.swing.JScrollPane

import scala.collection.mutable

import isabelle.proofdocument.{Command, Proof_Document, Prover}

import isabelle.Isabelle_System

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"

  /* properties */

  val OPTION_PREFIX = "options.isabelle."

  object Property

  {

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

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

  }

  object Boolean_Property

  {

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

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

  }

  object Int_Property

  {

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

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

  }

  /* Isabelle system instance */

  var system: Isabelle_System = null

  def symbols = system.symbols

  lazy val completion = new Completion + symbols

  /* settings */

  def default_logic(): String =

  {

    val logic = Isabelle.Property("logic")

    if (logic != null) logic

    else 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

{

  /* event buses */

  val state_update = new Event_Bus[Command]

  /* selected state */

  private var _selected_state: Command = null

  def selected_state = _selected_state

  def selected_state_=(state: Command) { _selected_state = state; state_update.event(state) }

  /* mapping buffer <-> prover */

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

  private def install(view: View)

  {

    val buffer = view.getBuffer

    val prover_setup = new Prover_Setup(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[Prover_Setup] = mapping.get(buffer)

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

  /* main plugin plumbing */

  override def handleMessage(msg: EBMessage)

  {

    msg match {

      case epu: EditPaneUpdate =>

        val buffer = epu.getEditPane.getBuffer

        epu.getWhat match {

          case EditPaneUpdate.BUFFER_CHANGED =>

            (mapping get buffer) map (_.theory_view.activate)

          case EditPaneUpdate.BUFFER_CHANGING =>

            if (buffer != null)

              (mapping get buffer) map (_.theory_view.deactivate)

          case _ =>

        }

      case _ =>

    }

  }

  override def start()

  {

    Isabelle.plugin = this

    Isabelle.system = new Isabelle_System

    Isabelle.system.register_fonts()

  }

  override def stop()

  {

    // TODO: proper cleanup

    Isabelle.system = null

    Isabelle.plugin = null

  }

}