/** 
  * Message Panel for the Moving Map Navigator
  * @author Robert J Morton <rob@robmorton.20m.com>
  * @version 12 December 2007
  * @copyright Robert J Morton (all rights reserved) */


import javax.swing.*;     // Java Swing GUI utilities
import java.awt.*;        // Java Abstract Windowing Toolkit
import java.awt.event.*;  // for the new-fangled 1.1 event handling

class msgpanel extends JPanel {  // TO DISPLAY ERROR AND PROGRESS MESSAGES

  // what the hell this is for, I don't 
  private static final long serialVersionUID = 37L;

  private static msgpanel mp;  // reference to current instance of this class

  private movmap mm;  // Reference to current instance of the movmap applet
  private loader ld;  // Reference to the current instance of the data loader

  private boolean        // TRUE =
    progressMsg = true,  // progress message, not an error message
    imageLoad = false,   // image load failure, false: route/wpt load failure
    b = false;           // text colour has been changed

  private int
    Lx =  15, Ly = 480,  // position of top left corner of panel within applet
    Lw = 406, Lh =  35,  // width and height of panel
    Bw =  72,            // button width
    Mw = Lw - Bw,        // width of message area
    Ti = 10,             // text inset from start of message area
    q = Bw + Ti,         // x-bias for printing directly on panel or on image
    My;                  // y-origin of the message line

  private String msg = "";  // to contain the current message to be displayed

  // button for retrying loading of a route names or waypoints list
  private JButton RtryBut;

  /* References for large and small fonts used in this
  applet and the typeface dimensions for this font. */

  private Font font;
  private FontMetrics fm;
  private Color fg, fgc;  // foreground colour


  msgpanel(movmap mm, Color fg) {
    this.mm = mm;
    this.fg = fg;  // foreground colour (for lettering)
    mp = this;     // reference to this instance of this class

    setLayout(null);    // to allow the control panels to be laid out manually
    fgc = Color.black;  // initial foreground colour before images are loaded

    /* Create font for applet canvas, get its letter
    dimensions etc vertical base line offset, */

    font = new Font("Serif",Font.BOLD,16);
    fm = getFontMetrics(font);
    My = (Lh + fm.getAscent()) >> 1;

    /* Create the "Retry" button, set position
    and size and create a listener for it. */

    RtryBut = new JButton("");
    add(RtryBut);
    RtryBut.setBounds(0,0,Bw,Lh);
    RtryBut.addActionListener(new rtlisten(rtlisten.RTRYBUT,this));
  }

  void setLoader(loader ld) {this.ld = ld;}
  void changeColour() { fgc = fg; b = true; }


  // DISPLAY ON INITIALIZATION OR WHEN APPLET IS UNECLIPSED
  public void paint(Graphics g) {
    super.paint(g);  // paint the retry button

    /* If the text colour has been changed, draw the panel's
    background photograph; otherwise, clear the text field by
    filling it with the background colour. */

    if(b)
      g.drawImage(movmap.IMG4,Bw,0,this);
    else {
      g.setColor(getBackground());
      g.fillRect(Bw,0,Mw,Lh);
    }
    g.setFont(font);  // use the big bold font

    /* if loading is in progress, set button lettering colour
    to light grey and display the text 'Retry' then display
    the route information in black lettering. */

    if(progressMsg) {
      RtryBut.setForeground(Color.lightGray); RtryBut.setText("Retry");
      g.setColor(fgc);
    }

    /* Otherwise it must be an error condition, so set button
    lettering colour to black and display the text 'Retry'
    then display the error message in red lettering. */

    else { 
      RtryBut.setForeground(Color.black);
      RtryBut.setText("Retry");
      g.setColor(Color.red);
    }
    g.drawString(msg,q,My);  // display the message
  }


  void showMsg(String msg, boolean progressMsg, boolean imageLoad) {
    this.msg = msg;
    this.progressMsg = progressMsg;
    this.imageLoad = imageLoad;
    repaint();  // gets graphics reference and calls update(g)
  }


  // RE-TRY BUTTON TO ATTEMPT A RELOAD AFTER AN ERROR
  void pressRtryBut() {

    if(progressMsg) return;  // exit if it's not an error message

    /* if the error occurred during image loading, kill the label of the
    retry button and request a reload of all images. */

    if(imageLoad) { RtryBut.setText(""); mm.imgReload(); }

    /* Otherwise, the error must have occurred during the
    loading of the routes data, so if there was a connecting
    or loading error, kill the label of the retry button, wipe
    the error message and re-initiate the loading sequence.  */

    else if(ld.getlp() > 3) {
      RtryBut.setText("");
      showMsg("",true,false);
      ld.setlp(1);
    } 
  }
}



// LISTENS FOR EVENTS FROM THE BUTTONS
class rtlisten implements ActionListener {
  static final int 
    RTRYBUT = 3;  // 'route search button pressed' event
  int id;         // one of the above
  msgpanel ap;    // the application that called: always the above panel

  // constructor for a new command
  public rtlisten(int id, msgpanel ap) { this.id = id; this.ap = ap; }

  // The 'find' button is the only one we are listening for here.
  public void actionPerformed(ActionEvent e) {
    switch(id) { case RTRYBUT: ap.pressRtryBut(); break; }
  }
}