/** 
  * Message Panel for the Moving Map Navigator
  * @author Robert J Morton YE572246C
  * @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

  private static final long 
    serialVersionUID = 15L;   // what the hell this is for, I don't know!
  private static msgpanel mp; // reference to current instance of this class
  private boolean 
    progressMsg = true,  /* true if message is a progress message, 
                              not an error message. */
    imageLoad = false,   /* true = image load failure, 
                              false = route/wpt load failure. */
    b = false;

  private int
    Lx =  15, Ly = 480,  // pos'n of top left corner of panel within applet
    Lw = 406, Lh =  35,  // width and height of panel
    Bw =  80,            // 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
    L;                   // language switch

  private String
    S[] = {"Retry","Tentar"},
    msg = "";  // to contain the current message to be displayed

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

  private JButton RtryBut;  // button for retrying to load
                            // a route names or waypoint list

  private Font font;  // ref for large and small fonts used in this applet
  private FontMetrics fm;  // typeface dimensions for the above fonts
  private Color fg, fgc;   // foreground colour


  msgpanel(movmap mm, Color fg, int L) {
    this.mm = mm;
    this.fg = fg;  // foreground colour (for lettering)
    mp = this;     // reference to this instance of this class
    this.L = L;
    setLayout(null);    // to allow the control panels to be laid out manually
    fgc = Color.black;  // initial foreground colour before images are loaded

    font = new Font("Serif",Font.BOLD,16);  // font for applet canvas
    fm = getFontMetrics(font);  // get letter dimensions for the above font
    My = (Lh + fm.getAscent()) >> 1;  // vertical base line offset

    /* Create the "Retry" button, set its position
    and size then 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

    g.setColor(mm.getPanelColour());  // Clear the message field by fill-
    g.fillRect(Bw,0,Mw,Lh);           // ing it with background colour.

    g.setFont(font);           // use the big bold font
    if(progressMsg) {          // if in the process of loading
      RtryBut.setForeground(Color.lightGray); 
      RtryBut.setText(S[L]);   // kill label on retry button
      g.setColor(fgc);         // display route information in black
    } else {                   // else it must be an error condition
      RtryBut.setForeground(Color.black); 
      RtryBut.setText(S[L]);   // change label on retry button to "Retry"
      g.setColor(Color.red);   // display error message in red lettering
    }
    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)
  }


  void pressRtryBut() {  // RE-TRY BUTTON TO ATTEMPT A RELOAD AFTER AN ERROR
    if(progressMsg) return;  // if it's not an error message, butt out
    if(imageLoad) {          // if error occurred during image loading
      RtryBut.setText("");   // kill the label of the retry button
    } else {                 // must have occurred during routes data loading

      /* If there was a connecting or loading error, kill
      the label of the retry button, wipe the error message
      then re-initiate the loading sequence. */

      if(ld.getlp() > 3) {
        RtryBut.setText(""); showMsg("", true, false); ld.setlp(1);
      } 
    }
  }           //error conditions tested and found to be working correctly
}



// 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; }

  // one of the buttons has been clicked
  public void actionPerformed(ActionEvent e) {
    switch(id) {  // id of this instance of ActionEvent
      case RTRYBUT: ap.pressRtryBut(); break;  // it was the 'find' button
    }
  }
}