package ru.pp.maxcom;

import org.w3c.dom.Element;
import org.w3c.dom.Document;
import org.w3c.dom.DOMImplementation;
import org.w3c.dom.Attr;

import java.io.File;

import com.drew.metadata.Metadata;
import com.drew.metadata.Directory;
import com.drew.metadata.MetadataException;
import com.drew.metadata.exif.ExifDirectory;
import com.drew.imaging.jpeg.JpegMetadataReader;
import com.drew.imaging.jpeg.JpegProcessingException;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

public class ExifXsl {
  public final static String EXIF_NS = "http://maxcom.pp.ru/photo/exif";
  final Directory exifDirectory;

  public ExifXsl(String filename) throws JpegProcessingException {
    File jpegFile = new File(filename);
    Metadata metadata = JpegMetadataReader.readMetadata(jpegFile);
    exifDirectory = metadata.getDirectory(ExifDirectory.class);
  }

  public Element getExif() throws JpegProcessingException, ParserConfigurationException, MetadataException {
    Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().getDOMImplementation().createDocument(EXIF_NS, "exif", null);

    Element camera = document.createElement("camera");
    camera.appendChild(document.createTextNode(exifDirectory.getString(ExifDirectory.TAG_MODEL)));
    document.getDocumentElement().appendChild(camera);

    Element exposure = document.createElement("exposure");
    exposure.setAttribute("aperture", exifDirectory.getString(ExifDirectory.TAG_FNUMBER));
    exposure.setAttribute("speed", exifDirectory.getString(ExifDirectory.TAG_EXPOSURE_TIME));
    exposure.setAttribute("iso", exifDirectory.getString(ExifDirectory.TAG_ISO_EQUIVALENT));
    document.getDocumentElement().appendChild(exposure);

    Element date = document.createElement("date");
    date.appendChild(document.createTextNode(exifDirectory.getDate(ExifDirectory.TAG_DATETIME_ORIGINAL).toString()));
    document.getDocumentElement().appendChild(date);

    Element lens = document.createElement("lens");
    lens.appendChild(document.createTextNode(exifDirectory.getString(ExifDirectory.TAG_FOCAL_LENGTH)));
    document.getDocumentElement().appendChild(lens);

    return document.getDocumentElement();
  }
}