import RssReader._
import swing._

object RssGui extends SimpleSwingApplication {
  var rssFeeds = List(("None Loaded", Seq("")))

  var configFileChooser = new FileChooser(new java.io.File("./"))
  var configFileName = new String

  // Channel Panel Construction: Channel Select
  val channelLabel = new Label {
    text = "Select a channel:"
  }

  val channelSelect = new ComboBox(List("None Loaded")) { }

  val channelSelectPanel = new BoxPanel(Orientation.Vertical) {
    contents += channelLabel
    contents += channelSelect
    border = Swing.EmptyBorder(0, 0, 0, 30)
  }

  // Channel Panel Construction: Rss Display
  val rssDisplay = new ListView(List(""))

  // Channel Panel Construction
  val channelPanel = new BoxPanel(Orientation.Horizontal) {
    contents += channelSelectPanel
    contents += rssDisplay
    border = Swing.EmptyBorder(0, 0, 30, 0)
  }

  // Button Panel Construction
  val setConfigFileButton = new Button {
    text = "Set Config File"
  }

  val loadRssButton = new Button {
    text = "Load Feeds"
  }

  val buttonPanel = new BoxPanel(Orientation.Horizontal) {
    contents += setConfigFileButton
    contents += loadRssButton
  }

  def top = new MainFrame {
    title = "Rss Reader"

    listenTo(channelSelect.selection, setConfigFileButton, loadRssButton)
    reactions += {
      case swing.event.SelectionChanged(`channelSelect`) =>
        rssDisplay.listData = rssFeeds(channelSelect.selection.index)._2
        pack
      case swing.event.ButtonClicked(`setConfigFileButton`) =>
        if(configFileChooser.showOpenDialog(channelSelectPanel) ==
            FileChooser.Result.Approve) {
          configFileName = configFileChooser.selectedFile.getAbsolutePath
        }
      case swing.event.ButtonClicked(`loadRssButton`) =>
        if(configFileName != "") {
          rssFeeds = combineFeeds(getRssFeeds(configFileName))
          channelSelect.peer.setModel(ComboBox.newConstantModel(rssFeeds.map(_._1)))
          rssDisplay.listData = rssFeeds(0)._2
          pack
        }
    }

    // Overall construction
    contents = new BoxPanel(Orientation.Vertical) {
      contents += channelPanel
      contents += buttonPanel
      border = Swing.EmptyBorder(10, 10, 10, 10)
    }
  }
}