package com.safemobile.uicomponents;

import java.util.Hashtable;

import com.safemobile.lib.R;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.widget.TextView;

public class EnhancedTextView extends TextView {

	private static final Hashtable<String, Typeface> cache = new Hashtable<String, Typeface>();

	public EnhancedTextView(Context context) {
		super(context);
	}

	public EnhancedTextView(Context context, AttributeSet attrs) {
		super(context, attrs);
		setCustomFont(context, attrs);
	}

	public EnhancedTextView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
		setCustomFont(context, attrs);
	}

	/**
	 * Set a custom TypeFace that is specified in the XML attrs of the object 
	 * @param ctx The context of the application
	 * @param attrs The attributes which are passed from the XML
	 */
	private void setCustomFont(Context ctx, AttributeSet attrs) {
		TypedArray a = ctx.obtainStyledAttributes(attrs, R.styleable.EnhancedTextView);
		String customFont = a.getString(R.styleable.EnhancedTextView_setFont);
		setCustomFont(ctx, customFont);
		a.recycle();
	}

	/**
	 * Function to change the TypeFace/Font of a textView
	 * @param ctx The context of the application
	 * @param fontName The name of the TypeFace which needs to be set
	 * @return A boolean telling if the TypeFace was set, or false in case of error
	 */
	public boolean setCustomFont(Context ctx, String fontName) {
		Typeface tf = getTypeFace(ctx, fontName);
		if(tf == null)
			return false;

		setTypeface(tf);  
		return true;
	}


	/**
	 * In the Android versions previous than 4.0 there is a memory leak that won't free TypeFaces. 
	 * In order to fix this issue, a HashMap (cache) of TypeFaces will be created that will fetch a TypeFace
	 * if it exists, or it will create it and then return it. 
	 * @param c The context of the application
	 * @param fontName The name of the typeface which needs to be fetched
	 * @return The desired Typeface object, or null if the typeface wasn't in the cache and could not be created
	 */
	public static Typeface getTypeFace(Context c, String fontName){
		synchronized(cache){
			if (cache == null || fontName == null) 
				return null;
			
			if(!cache.containsKey(fontName)){
				try {
					Typeface t = Typeface.createFromAsset(c.getAssets(), fontName);
					cache.put(fontName, t);
				}
				catch(Exception ex) {
					return null;
				}
			}
			return cache.get(fontName);
		}
	}
}