package org.simantics.document.linking.report.pdf;

import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.io.File;
import java.io.FileOutputStream;

import com.lowagie.text.Document;
import com.lowagie.text.Rectangle;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfTemplate;
import com.lowagie.text.pdf.PdfWriter;

public class PDFPage {
	public PDFPageStream stream;
	public Graphics2D g2d;
	public Document document;
	public PdfWriter writer;
	public File tempFile;
	public PdfContentByte cb;
	public PdfTemplate template = null;
	public Font font;
	
	FontRenderContext frc;
	FontMetrics fm;
	
	int currentPixel = 0;
	int currentLine = 0;
	int availableLines = 0;
	
	
	public PDFPage(PDFPageStream stream) throws Exception{
		this.stream = stream;
		Rectangle pageSize = stream.getPageSize();
		document = new Document(pageSize);
		tempFile = File.createTempFile("ReportGenerator", ".pdf"); //$NON-NLS-1$ //$NON-NLS-2$
		writer = PdfWriter.getInstance(document, new FileOutputStream(tempFile));
		document.open();
		this.cb = writer.getDirectContent();

        
        writer.flush();
		template = cb.createTemplate(pageSize.getWidth(), pageSize.getHeight());
		g2d = template.createGraphics(pageSize.getWidth(), pageSize.getHeight());
		g2d.translate(stream.marginLeft, stream.marginTop);
        g2d.setClip(0, 0, stream.contentWidth, stream.contentHeight);
        currentPixel = 0;
        currentLine = 1;
       
        setFont(stream.getDefaultFont());
	}
	
	protected int getLineHeight() {
		return fm.getHeight();
	}
	
	public boolean isOpen() {
		return template != null;
	}
	
	public void setFont(Font font) {
		this.font = font;
		g2d.setFont(font);
        fm = g2d.getFontMetrics();
        frc = new FontRenderContext(g2d.getTransform(), true, true);
        estimateAvailableLines();
	}
	
	protected void estimateAvailableLines() {
		 availableLines = (int)Math.floor((stream.contentHeight-currentPixel)/getLineHeight());
	}
	
	public Font getFont() {
		return font;
	}
	
	public void writeLine(String line) throws Exception{
		writeLine(line, 0);
	}
	
	public void writeLine(String line, int x) throws Exception{
		g2d.drawString(line, x, currentPixel+getLineHeight());
		currentLine++;
		availableLines--;
		currentPixel += getLineHeight();
		stream.checkNextPage();
	}
	
	public void close() {
		g2d.dispose();
		cb.addTemplate(template, 0, 0);
        template = null;
        
		document.close();
		if (writer != null)
			writer.close();
		document = null;
		writer = null;
		cb = null;
		g2d = null;
	}
}