package ij.util;
import ij.*;
import ij.process.*;
import ij.plugin.DICOM;

/** DICOM utilities */
public class DicomTools {
	private static final int MAX_DIGITS = 5;
	private static String[] sliceLabels;

	/** Sorts a DICOM stack by image number. */
	public static ImageStack sort(ImageStack stack) {
		if (IJ.debugMode) IJ.log("Sorting by DICOM image number");
		if (stack.getSize()==1) return stack;
		String[] strings = getSortStrings(stack, "0020,0013");
		if (strings==null) return stack;
		StringSorter.sort(strings);
		ImageStack stack2 = null;
		if (stack.isVirtual())
			stack2 = ((VirtualStack)stack).sortDicom(strings, sliceLabels, MAX_DIGITS);
		else
			stack2 = sortStack(stack, strings);
		return stack2!=null?stack2:stack;
	}
	
	private static ImageStack sortStack(ImageStack stack, String[] strings) {
		ImageProcessor ip = stack.getProcessor(1);
		ImageStack stack2 = new ImageStack(ip.getWidth(), ip.getHeight(), ip.getColorModel());
		for (int i=0; i1) {
			ImageStack stack = imp.getStack();
			String label = stack.getSliceLabel(imp.getCurrentSlice());
			if (label!=null && label.indexOf('\n')>0) metadata = label;
		}
		if (metadata==null)
			metadata = (String)imp.getProperty("Info");
		return getTag(metadata, id);
	}
	
	private static double getSeriesNumber(String tags) {
		double series = getNumericTag(tags, "0020,0011");
		if (Double.isNaN(series)) series = 0;
		return series;
	}

	private static double getNumericTag(String hdr, String tag) {
		String value = getTag(hdr, tag);
		if (value==null) return Double.NaN;
		int index3 = value.indexOf("\\");
		if (index3>0)
			value = value.substring(0, index3);
		return Tools.parseDouble(value);
	}

	private static String getTag(String hdr, String tag) {
		if (hdr==null) return null;
		int index1 = hdr.indexOf(tag);
		if (index1==-1) return null;
		//IJ.log(hdr.charAt(index1+11)+"   "+hdr.substring(index1,index1+20));
		if (hdr.charAt(index1+11)=='>') {
			// ignore tags in sequences
			index1 = hdr.indexOf(tag, index1+10);
			if (index1==-1) return null;
		}
		index1 = hdr.indexOf(":", index1);
		if (index1==-1) return null;
		int index2 = hdr.indexOf("\n", index1);
		String value = hdr.substring(index1+1, index2);
		return value;
	}

}