/*
 * Created on 16 July 2006
 * Copyright (C) Azureus Software, Inc, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */
package org.gudy.azureus2.ui.swt;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

import org.gudy.azureus2.core3.internat.MessageText;
import org.gudy.azureus2.core3.util.AERunnable;
import org.gudy.azureus2.core3.util.Constants;
import org.gudy.azureus2.core3.util.Debug;
import org.gudy.azureus2.plugins.ui.UIInputValidator;
import org.gudy.azureus2.ui.swt.pluginsimpl.AbstractUISWTInputReceiver;

/**
 * @author amc1
 * Based on CategoryAdderWindow.
 */
public class SimpleTextEntryWindow extends AbstractUISWTInputReceiver {
	
	private Display display;
	private Shell shell;
	private int textLimit;
	private Combo text_entry_combo;
	private Text text_entry_text;
	
	public SimpleTextEntryWindow() {
	}

	public SimpleTextEntryWindow(String sTitleKey, String sLabelKey) {
		setTitle(sTitleKey);
		setMessage(sLabelKey);
	}

	public SimpleTextEntryWindow(String sTitleKey, String sLabelKey, boolean bMultiLine) {
		setTitle(sTitleKey);
		setMessage(sLabelKey);
		setMultiLine(bMultiLine);
	}

	public void initTexts(String sTitleKey, String[] p0, String sLabelKey,
			String[] p1) {
		setLocalisedTitle(MessageText.getString(sTitleKey, p0));
		setLocalisedMessage(MessageText.getString(sLabelKey, p1));
	}
	
	protected void promptForInput() {
		Utils.execSWTThread(new Runnable() {
			public void run() {
				promptForInput0();
				if (receiver_listener == null) {
					while (shell != null && !shell.isDisposed())
						if (!display.readAndDispatch()) display.sleep();
				}
			}
		}, receiver_listener != null);
	}
	
	private void promptForInput0() {
		//shell = org.gudy.azureus2.ui.swt.components.shell.ShellFactory.createShell(Utils.findAnyShell(), SWT.DIALOG_TRIM | SWT.APPLICATION_MODAL);
		// link to active shell, so that when it closes, the input box closes (good for config windows)
		Shell parent = Display.getDefault().getActiveShell();
		if (parent == null) {
			parent = Utils.findAnyShell();
		}
		shell = org.gudy.azureus2.ui.swt.components.shell.ShellFactory.createShell(parent, SWT.DIALOG_TRIM);

		display = shell.getDisplay();
		if (this.title != null) {
			shell.setText(this.title);
		}
	    
		Utils.setShellIcon(shell);
		
	    GridLayout layout = new GridLayout();
	    layout.verticalSpacing = 10;
	    shell.setLayout(layout);
	    
	    // Default width hint is 330.
	    int width_hint = (this.width_hint == -1) ? 330 : this.width_hint;
	    
	    // Process any messages.
	    Label label = null;
	    GridData gridData = null;
	    for (int i=0; i<this.messages.length; i++) {
	    	label = new Label(shell, SWT.WRAP);
	    	label.setText(this.messages[i]);
	    	
	    	// 330 is the current default width.
	    	gridData = new GridData();
	    	gridData.widthHint = width_hint;
		    label.setLayoutData(gridData);
	    }
	    
	    // Create Text object with pre-entered text.
	    final Scrollable text_entry;
	    if (this.choices != null) {
	    	int text_entry_flags = SWT.DROP_DOWN;
	    	if (!this.choices_allow_edit) {
	    		text_entry_flags |= SWT.READ_ONLY;
	    	}
	    	
	    	text_entry_combo = new Combo(shell, text_entry_flags);
	    	text_entry_combo.setItems(this.choices);
	    	if (textLimit > 0) {
	    		text_entry_combo.setTextLimit(textLimit);
	    	}
	    	text_entry_text = null;
	    	text_entry = text_entry_combo;
	    }
	    else {
		    // We may, at a later date, allow more customisable behaviour w.r.t. to this.
		    // (e.g. "Should we wrap this, should we provide H_SCROLL capabilities" etc.)
		    int text_entry_flags = SWT.BORDER;
		    if (this.multiline_mode) {
		    	text_entry_flags |= SWT.MULTI | SWT.V_SCROLL | SWT.WRAP; 
		    }
		    else {
		    	text_entry_flags |= SWT.SINGLE;
		    }
	    	
	    	text_entry_text = new Text(shell, text_entry_flags);
	    	
	    	if (textLimit > 0) {
	    		text_entry_text.setTextLimit(textLimit);
	    	}
	    	text_entry_combo = null;
	    	text_entry = text_entry_text;
	    }
	    if (this.preentered_text != null) {
	    	if (text_entry_text != null) {
		    	text_entry_text.setText(this.preentered_text);
		    	if (this.select_preentered_text) {
		    		
		    		int[] range = this.select_preentered_text_range;
		    		
		    		if ( range == null || range.length != 2 ){
		    			text_entry_text.selectAll();
		    		}else{
		    			try{
		    				text_entry_text.setSelection( range[0], range[1] );
		    			}catch( Throwable e ){
		    				text_entry_text.selectAll();
		    			}
		    		}
		    	}
	    	}
	    	else if (text_entry_combo != null ){
		    	text_entry_combo.setText(this.preentered_text);
	    	}
	    }
	    
	    // TAB will take them out of the text entry box.
	    text_entry.addTraverseListener(new TraverseListener() {
	    	public void keyTraversed(TraverseEvent e) {
	    		if (e.detail == SWT.TRAVERSE_TAB_NEXT || e.detail == SWT.TRAVERSE_TAB_PREVIOUS) {
	    			e.doit = true;
	    		}
	    	}
	    });
	    
	    text_entry.addKeyListener(new KeyListener() {

				public void keyPressed(KeyEvent e) {
					int key = e.character;
					if (key <= 26 && key > 0) {
						key += 'a' - 1;
					}
					
					if (key == 'a' && e.stateMask == SWT.MOD1) {
						if (text_entry_text != null) {
							text_entry_text.selectAll();
						}
					}
				}

				public void keyReleased(KeyEvent e) {
				}
	    	
	    });
	    
	    // Default behaviour - single mode results in default height of 1 line,
	    // multiple lines has default height of 3.
	    int line_height = this.line_height;
	    if (line_height == -1) {
	    	line_height = (this.multiline_mode) ? 3 : 1;
	    }
	    
	    gridData = new GridData();
	    gridData.widthHint = width_hint;
	    if (text_entry_text != null)
	    	gridData.minimumHeight = text_entry_text.getLineHeight() * line_height;
	    gridData.heightHint = gridData.minimumHeight;
	    text_entry.setLayoutData(gridData);

	    Composite panel = new Composite(shell, SWT.NULL);
	    final RowLayout rLayout = new RowLayout();
	    rLayout.marginTop = 0;
	    rLayout.marginLeft = 0;
	    rLayout.marginBottom = 0;
	    rLayout.marginRight = 0;
	    try {
	    	rLayout.fill = true;
	    } catch (NoSuchFieldError e) {
	    	// SWT 2.x
	    }
	    rLayout.spacing = Utils.BUTTON_MARGIN;
	    panel.setLayout(rLayout);
	    gridData = new GridData();
	    gridData.horizontalAlignment = SWT.END;
	    panel.setLayoutData(gridData);

	    Button ok; 
	    Button cancel; 
	    if (Constants.isOSX) {
	    	cancel = createAlertButton(panel, "Button.cancel");
	    	ok = createAlertButton(panel, "Button.ok");
	    } else {
	    	ok = createAlertButton(panel, "Button.ok");
	    	cancel = createAlertButton(panel, "Button.cancel");
	    }

	    ok.addListener(SWT.Selection, new Listener() {
	    	
	    	private void showError(String text) {
	    		  String error_title = SimpleTextEntryWindow.this.title;
	    		  if (error_title == null) {error_title = "";}

	    		  MessageBox mb = new MessageBox(shell, SWT.ICON_ERROR | SWT.OK);
	    		  mb.setText(error_title);
	    		  mb.setMessage(text);
	    		  mb.open();
	    	}
	    	
	      /* (non-Javadoc)
	       * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
	       */
	      public void handleEvent(Event event) {
	    	  try {
	    		  String entered_data = "";
	    		  if (text_entry_text != null) {
	    			  entered_data = text_entry_text.getText();
	    		  }
	    		  else if (text_entry_combo != null) {
	    			  entered_data = text_entry_combo.getText();
	    		  }

	    		  
	    		  if (!SimpleTextEntryWindow.this.maintain_whitespace) {
	    			  entered_data = entered_data.trim();
	    		  }
	    		  
	    		  if (textLimit > 0 && entered_data.length() > textLimit) {
	    		  	entered_data = entered_data.substring(0, textLimit);
	    		  }
	    		  
	    		  if (!SimpleTextEntryWindow.this.allow_empty_input && entered_data.length() == 0) {
	    			  showError(MessageText.getString("UI.cannot_submit_blank_text"));
	    			  return;
	    		  }
	    		  
	    		  UIInputValidator validator = SimpleTextEntryWindow.this.validator;
	    		  if (validator != null) {
	    			  String validate_result = validator.validate(entered_data);
	    			  if (validate_result != null) {
		    			  showError(MessageText.getString(validate_result));
		    			  return;	    				  
	    			  }
	    		  }
	    		  SimpleTextEntryWindow.this.recordUserInput(entered_data);
	    	  }
	    	  catch (Exception e) {
	    		  Debug.printStackTrace(e);
	    		  SimpleTextEntryWindow.this.recordUserAbort();
	    	  }
	    	  shell.dispose();
	      }
	    });
	
	    cancel.addListener(SWT.Selection, new Listener() {
	        /* (non-Javadoc)
	         * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
	         */
	        public void handleEvent(Event event) {
	        	SimpleTextEntryWindow.this.recordUserAbort();
	            shell.dispose();
	        }
	      });

	    shell.setDefaultButton(ok);
	    
		shell.addListener(SWT.Traverse, new Listener() {	
			public void handleEvent(Event e) {
				if ( e.character == SWT.ESC){
					SimpleTextEntryWindow.this.recordUserAbort();
					shell.dispose();
				}
			}
		});
		
		shell.addListener(SWT.Dispose, new Listener() {
			public void handleEvent(Event event) {
				if (!isResultRecorded()) {
					recordUserAbort();
				}
				triggerReceiverListener();
			}
		});
		
	    shell.pack();
	    if (text_entry_text != null)
	    	Utils.createURLDropTarget(shell, text_entry_text);
	    
	    	// don't shrink this control otherwise the manual speed entry for up/down speed on
	    	// the transfers bar doesn't work as parent shell small...
	    
	    Utils.centreWindow(shell,false);
	    shell.open();
	  }

  private static Button createAlertButton(final Composite panel, String localizationKey)
  {
      final Button button = new Button(panel, SWT.PUSH);
      button.setText(MessageText.getString(localizationKey));
      final RowData rData = new RowData();
      rData.width = Math.max(
              Utils.BUTTON_MINWIDTH,
              button.computeSize(SWT.DEFAULT,  SWT.DEFAULT).x
        );
      button.setLayoutData(rData);
      return button;
  }

  public void setTextLimit(int limit) {
  	textLimit = limit;
  	Utils.execSWTThread(new AERunnable() {
			public void runSupport() {
				if (text_entry_combo != null && !text_entry_combo.isDisposed()) {
					text_entry_combo.setTextLimit(textLimit);
				}
				if (text_entry_text != null && !text_entry_text.isDisposed()) {
					text_entry_text.setTextLimit(textLimit);
				}
			}
		});
  }
}
