package com.zackehh.example;

import com.zackehh.example.MinimalBrowser;

import android.content.Context;
import android.content.Intent;
import android.text.Layout;
import android.text.Spannable;
import android.text.method.MovementMethod;
import android.text.style.URLSpan;
import android.view.MotionEvent;
import android.widget.TextView;

/**
 * Implementation of LinkMovementMethod to allow the loading of 
 * a link clicked inside text inside an Android application
 * without exiting to an external browser.
 * 
 * @author Isaac Whitfield
 * @version 25/08/2013
 */
public class LinkMovementMethod extends android.text.method.LinkMovementMethod {

	// The context we pass to the method
	private static Context movementContext;
	// A new LinkMovementMethod
	private static LinkMovementMethod linkMovementMethod  = new LinkMovementMethod();

	public static MovementMethod getInstance(Context c){
		// Set the context
		movementContext = c;
		// Return this movement method
		return linkMovementMethod;
	}

	public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event){
		// Get the event action
		int action = event.getAction();
		
		// If action has finished
		if(action == MotionEvent.ACTION_UP) {
			// Locate the area that was pressed
			int x = (int) event.getX();
			int y = (int) event.getY();
			x -= widget.getTotalPaddingLeft();
			y -= widget.getTotalPaddingTop();
			x += widget.getScrollX();
			y += widget.getScrollY();
			
			// Locate the URL text
			Layout layout = widget.getLayout();
			int line = layout.getLineForVertical(y);
			int off = layout.getOffsetForHorizontal(line, x);

			// Find the URL that was pressed
			URLSpan[] link = buffer.getSpans(off, off, URLSpan.class);
			// If we've found a URL
			if (link.length != 0) {
				// Find the URL
				String url = link[0].getURL();
				// If it's a valid URL
				if (url.contains("https") | url.contains("tel") | url.contains("mailto") | url.contains("http") | url.contains("https") | url.contains("www")){
					// Open it in an instance of InlineBrowser
					movementContext.startActivity(new Intent(movementContext, MinimalBrowser.class).putExtra("url", url));
				} 
				// If we're here, something's wrong
				return true;
			}
		}
		return super.onTouchEvent(widget, buffer, event);
	}	
}