// Single_Get_Z_Range.js script by Christophe Leterrier
// Get the Zmin and Zmax form a localization file
// 14-10-28

importClass(Packages.ij.io.OpenDialog)
importClass(Packages.java.io.File)
importClass(Packages.ij.IJ);
importClass(Packages.ij.gui.GenericDialog);
importClass(Packages.java.io.File);
importClass(Packages.java.io.FileReader);
importClass(Packages.java.io.FileWriter);
importClass(Packages.java.io.BufferedReader);
importClass(Packages.java.io.BufferedWriter);
importClass(Packages.ij.IJ);
importClass(Packages.java.lang.Double);


var od = new OpenDialog("Choose a Thunderstorm txt file", "");

// var gd = new GenericDialog("Get Z Range Options");
// gd.showDialog();

var directory = od.getDirectory();
var name = od.getFileName();
var path = directory + name;
IJ.log("\nGet Z Range");
IJ.log("input file path:" + path);

getZRange(path);
IJ.log("Get Z range end");

function getZRange(inPath) {

	// separator (csv files)
	inSep = ",";

	// Define input and output files, folder etc.
	var inFile = new File(inPath); 
	var inName = inFile.getName();

	IJ.log("inName: " + inName);

	var br = new BufferedReader(new FileReader(inFile));
	
	// Read header
	var inLine = br.readLine();

	// initialize Zmin and Zmax with first Z value
	inLine = br.readLine();
	var inCells = inLine.split(inSep);
	var Zmin = inCells[3];
	var Zmax = inCells[3];

	// Get Z for each loc and update Zmin and Zmax if necessary
	while ((inLine = br.readLine()) != null) {

		inCells = inLine.split(inSep);
		var Z = parseFloat(inCells[3]);

		if (Z < Zmin) Zmin = Z;
		if (Z > Zmax) Zmax = Z;

		}
	
	br.close();

	// log the result
	IJ.log("Zmin=\n" + Zmin + "\nZmax=\n" + Zmax);
	
	return;
}