package com.qoppa.sample;

import java.awt.Color;
import java.awt.geom.Rectangle2D;
import java.util.List;
import java.util.Vector;

import com.qoppa.pdf.PDFException;
import com.qoppa.pdf.actions.URLAction;
import com.qoppa.pdf.annotations.Annotation;
import com.qoppa.pdf.annotations.Link;
import com.qoppa.pdfProcess.PDFDocument;
import com.qoppa.pdfProcess.PDFPage;
import com.qoppa.pdfProcess.content.FillColorSpan;
import com.qoppa.pdfProcess.content.LineSpan;
import com.qoppa.pdfProcess.content.TextContent;

/**
 * This sample shows how to get the TextContent object and group text into spans by text fill color and as lines of text in the page.
 * It shows how to find text close to a specified color and change its color.
 * It also shows how to search for a string of text within a Span and change the color of a subset of that span.
 *
 */
public class ChangePDFTextColor
{

	public static void main(String[] args) throws Exception
	{
		PDFDocument doc = new PDFDocument("C:/test/TestFile.pdf", null);
		for (int i = 0; i < doc.getPageCount(); i++)
		{
			PDFPage page = doc.getPage(i);
			TextContent textContent = page.getTextContent();

			// Group text into spans by text fill color
			List<FillColorSpan> spans = textContent.getSpans(FillColorSpan.class);
			for (FillColorSpan span : spans)
			{
				// look for spans of text with a fill color close to blue
				if (colorMatch(span.getColor(), 0, 10, 0, 10, 245, 255))
				{
					// change color of entire span
					span.setColor(Color.green);

					// if a link doesn't already exist, add one
					if (!linkExists(page, span.getBounds()))
					{
						addLink(page, span.getBounds());
					}
				}
			}
			
			// Group text into spans that contain a single line of text (the text may or may not have any attributes in common)
			List<LineSpan> lineSpans = textContent.getSpans(LineSpan.class);
			for (LineSpan span : lineSpans)
			{
				String searchText = "Qoppa";
				// find a string of text within the span
				int startIndex = span.getText().indexOf(searchText);
				
				if (startIndex > -1)
				{
					// change color of a subset of the span (where text was found)
					int endIndex = startIndex + searchText.length();
					span.setColor(Color.red, startIndex, endIndex);
				}
			}
		}
	}

	/**
	 * Returns true if the given Color's RGB components are within the given bounds.
	 * @param color The Color to check for a match.
	 * @param redMin The minimum acceptable value for the red component (inclusive).
	 * @param redMax The maximum acceptable value for the red component (inclusive).
	 * @param greenMin The minimum acceptable value for the green component(inclusive);
	 * @param greenMax The maximum acceptable value for the green component (inclusive).
	 * @param blueMin The minimum acceptable value for the blue component(inclusive).
	 * @param blueMax The maximum acceptable value for the blue component (inclusive).
	 * @return true if the given Color's RGB components are within the given bounds.
	 */
	public static boolean colorMatch(Color color, int redMin, int redMax, int greenMin, int greenMax, int blueMin, int blueMax)
	{
		return color.getRed() >= redMin && color.getRed() <= redMax &&
				color.getGreen() >= greenMin && color.getGreen() <= greenMax &&
				color.getBlue() >= blueMin && color.getBlue() <= blueMax;
		
	}
}