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package becta.viewer.accessibility;

import java.awt.Color;
import java.awt.Font;
import java.awt.SystemColor;
import java.util.HashMap;
import java.util.ResourceBundle;

import javax.swing.LookAndFeel;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
import javax.swing.plaf.metal.MetalLookAndFeel;

import becta.viewer.framework.Viewer;
import becta.viewer.util.Platform;

/**
 * This class implements the system theme
 */
public class SystemTheme implements Theme {

	/**
	 * Holds the array of theme colours
	 */
	private int[] themeColours;
	/**
	 * Hold fonts for this theme
	 */
	private HashMap<String, Font> themeFonts;
	
	/**
	 * Constructor for this class
	 */
	public SystemTheme() {

		//set theme colour for current theme
		setThemeColours();
		
		setThemeFont();
	}
	
	/**
	 * Get the Colour corresponding to given Colour index
	 * @param index
	 * @return Colour
	 */
	public Color getColor(int index) {
		
		return new Color(themeColours[index]);
	}

	/**
	 * Indicates whether the theme is the default one or not
	 * @return boolean value indicating whether the theme is the default one or not
	 */
	public boolean isDefaultTheme() {
		return false;
	}

	/**
	 * Loads system colours
	 */
	public void loadSystemColors() {
		
		AccessibilityColor.loadSystemColors(themeColours);
	}
	
	/**
	 * Get the name of current theme
	 */
	public String getName() {
		
		ResourceBundle resourceBundle = ResourceBundle.getBundle("becta.viewer.accessibility.resource");
		return resourceBundle.getString("SystemThemeName");
	}
	
	/**
	 * Get font for theme
	 */
	public Font getFont(String key) {

		return themeFonts.containsKey(key) ? themeFonts.get(key) : null;
	}
	
	/**
	 * Set theme colours for current theme in themeColours
	 */
	private void setThemeColours(){
	
		int[] themeColours = {
				SystemColor.desktop.getRGB(),  				// desktop
				SystemColor.activeCaption.getRGB(),  		// activeCaption
				SystemColor.activeCaptionText.getRGB(),     // activeCaptionText
				SystemColor.activeCaptionBorder.getRGB(),  	// activeCaptionBorder
				SystemColor.inactiveCaption.getRGB(),  		// inactiveCaption
				SystemColor.inactiveCaptionText.getRGB(),  	// inactiveCaptionText
				SystemColor.inactiveCaptionBorder.getRGB(), // inactiveCaptionBorder
				SystemColor.window.getRGB(),     			// window
				SystemColor.windowBorder.getRGB(),  		// windowBorder
				SystemColor.windowText.getRGB(),  			// windowText
				SystemColor.menu.getRGB(),         			// menu
				SystemColor.menuText.getRGB(),  			// menuText
				SystemColor.text.getRGB(),         			// text
				SystemColor.textText.getRGB(),  			// textText
				SystemColor.textHighlight.getRGB(),  		// textHighlight
				SystemColor.textHighlightText.getRGB(),     // textHighlightText
				SystemColor.textInactiveText.getRGB(),  	// textInactiveText
		        SystemColor.control.getRGB(),  				// control
		        SystemColor.controlText.getRGB(),  			// controlText
		        SystemColor.controlHighlight.getRGB(),  	// controlHighlight
		        SystemColor.controlLtHighlight.getRGB(),  	// controlLtHighlight
		        SystemColor.controlShadow.getRGB(),  		// controlShadow
		        SystemColor.controlDkShadow.getRGB(),  		// controlDkShadow
		        SystemColor.scrollbar.getRGB(),  			// scrollbar
		        SystemColor.info.getRGB(),  				// info
		        SystemColor.infoText.getRGB(),  			// infoText
		        SystemColor.menu.getRGB(), 					// menuItem
		        SystemColor.windowBorder.getRGB(), 			// menuItemSeparator
		        SystemColor.textHighlight.getRGB(),			// toolButtonHighlight
		        SystemColor.textHighlight.getRGB(),			// buttonHighlight
		        SystemColor.textHighlight.getRGB(),			// selectionBorderColor
		        SystemColor.textHighlight.getRGB(),			// selectionFillColor
		        SystemColor.control.getRGB(),				// revealerColour
		        SystemColor.controlText.getRGB(),			// canvasBorder
		        SystemColor.controlText.getRGB(),			// revealerBorder
		        SystemColor.lightGray.getRGB()			// contentBackColour
		};
		
		this.themeColours = themeColours;
	}
	
	/**
	 * Set fonts for this theme
	 */
	private void setThemeFont(){
		
		try{
			
			themeFonts = new HashMap<String, Font>();
			
			if(Platform.isWindows){
				
				Class lnfClass = Class.forName(UIManager.getSystemLookAndFeelClassName(), true, Thread.currentThread().getContextClassLoader());
	            LookAndFeel laf = (LookAndFeel)(lnfClass.newInstance());
	            UIDefaults defaults = laf.getDefaults();
	            Font controlFont = (Font)defaults.get("MenuItem.font");
	            
	            themeFonts.put("Label.font", controlFont);
	            themeFonts.put("Button.font", controlFont);
	            themeFonts.put("List.font", controlFont);
	            themeFonts.put("ComboBox.font", controlFont);
	            themeFonts.put("TextField.font", controlFont);
	            themeFonts.put("TableHeader.font", controlFont);
	            themeFonts.put("ToolTip.font", controlFont);
	            themeFonts.put("CheckBox.font", controlFont);
				themeFonts.put("ViewerControlFont", controlFont);
				themeFonts.put("MenuItemFont", controlFont);
				themeFonts.put("AboutDialogFont", controlFont);
			}
			else{
				MetalLookAndFeel laf = new MetalLookAndFeel();
				UIDefaults defaults = laf.getDefaults();
				themeFonts.put("Label.font", (Font)defaults.get("MenuItem.font"));
				themeFonts.put("Button.font", (Font)defaults.get("Button.font"));
				themeFonts.put("List.font", (Font)defaults.get("List.font"));
				themeFonts.put("ComboBox.font", (Font)defaults.get("ComboBox.font"));
				themeFonts.put("TextField.font", (Font)defaults.get("TextField.font"));
				themeFonts.put("TableHeader.font", (Font)defaults.get("TableHeader.font"));
				themeFonts.put("ToolTip.font", (Font)defaults.get("ToolTip.font"));
				themeFonts.put("CheckBox.font", (Font)defaults.get("CheckBox.font"));
				themeFonts.put("ViewerControlFont", new Font("Arial", Font.BOLD, 12));
				themeFonts.put("MenuItemFont", new Font("Arial", Font.PLAIN, 12));
				themeFonts.put("AboutDialogFont", new Font("Serif", Font.PLAIN, 11));
			}
			
		}
		catch (Exception e) {
			Viewer.logException(e);
		}
	}
}