/* Configure script for modbus.dll, specific for Windows with Scripting Host.
 *
 * Inspired by configure.js from libxml2
 *
 * oldfaber  < oldfaber _at_ gmail _dot_ com >
 *
 */

/* The source directory, relative to the one where this file resides. */
var srcDir = "..";
/* Base name of what we are building. */
var baseName = "modbus";
/* Configure file template and output file */
var configFile = srcDir + "\\..\\configure.ac";
/* Input and output files for the modbus-version.h include */
var newfile;
/* Version strings for the binary distribution. Will be filled later in the code. */
var verMajor;
var verMinor;
var verMicro;
/* modbus features. */
var dryRun = false;
/* Win32 build options. NOT used yet */
var compiler = "msvc";
/* Local stuff */
var error = 0;
/* Filename */
var newFile;

/* Displays the details about how to use this script. */
function usage() {
	var txt;

	txt = "Usage:\n";
	txt += "  cscript " + WScript.ScriptName + " <options>\n";
	txt += "  cscript " + WScript.ScriptName + " help\n\n";
	txt += "Options can be specified in the form <option>=<value>, where the value is\n";
	txt += "either 'yes' or 'no', if not stated otherwise.\n\n";
	txt += "\nModbus library configure options, default value given in parentheses:\n\n";
	txt += "  dry-run:  Run configure without creating files (" + (dryRun ? "yes" : "no")  + ")\n";
	txt += "\nWin32 build options, default value given in parentheses:\n\n";
	txt += "  compiler: Compiler to be used [msvc|mingw] (" + compiler + ")\n";
	WScript.Echo(txt);
}

/* read the version from the configuration file */
function readVersion() {
	var fso, cf, ln, s;
	fso = new ActiveXObject("Scripting.FileSystemObject");
	cf = fso.OpenTextFile(configFile, 1);
	while (cf.AtEndOfStream !== true) {
		ln = cf.ReadLine();
		s = new String(ln);
		if (s.search(/^m4_define\(\[libmodbus_version_major/) != -1) {
			verMajor = s.substr(s.indexOf(",") + 3, 1);
		} else if (s.search(/^m4_define\(\[libmodbus_version_minor/) != -1) {
			verMinor = s.substr(s.indexOf(",") + 3, 1);
		} else if (s.search(/^m4_define\(\[libmodbus_version_micro/) != -1) {
			verMicro = s.substr(s.indexOf(",") + 3, 1);
		}
	}
	cf.Close();
}

/* create the versioned file */
function createVersionedFile(newfile, unversioned) {
	var fso, ofi, of, ln, s;
	fso = new ActiveXObject("Scripting.FileSystemObject");
	ofi = fso.OpenTextFile(unversioned, 1);
	if (!dryRun) {
		of = fso.CreateTextFile(newfile, true);
	}
	while (ofi.AtEndOfStream !== true) {
		ln = ofi.ReadLine();
		s = new String(ln);
		if (!dryRun && s.search(/\@LIBMODBUS_VERSION_MAJOR\@/) != -1) {
			of.WriteLine(s.replace(/\@LIBMODBUS_VERSION_MAJOR\@/, verMajor));
		} else if (!dryRun && s.search(/\@LIBMODBUS_VERSION_MINOR\@/) != -1) {
			of.WriteLine(s.replace(/\@LIBMODBUS_VERSION_MINOR\@/, verMinor));
		} else if (!dryRun && s.search(/\@LIBMODBUS_VERSION_MICRO\@/) != -1) {
			of.WriteLine(s.replace(/\@LIBMODBUS_VERSION_MICRO\@/, verMicro));
		} else if (!dryRun && s.search(/\@LIBMODBUS_VERSION\@/) != -1) {
			of.WriteLine(s.replace(/\@LIBMODBUS_VERSION\@/, verMajor + "." + verMinor + "." + verMicro));
		} else {
			if (!dryRun) {
				of.WriteLine(ln);
			}
		}
	}
	ofi.Close();
	if (!dryRun) {
		of.Close();
	}
}


/*
 * main(),
 * Execution begins here.
 */

// Parse the command-line arguments.
for (i = 0; (i < WScript.Arguments.length) && (error === 0); i++) {
	var arg, opt;
	arg = WScript.Arguments(i);
	opt = arg.substring(0, arg.indexOf("="));
	if (opt.length > 0) {
		if (opt == "dry-run") {
			var str = arg.substring(opt.length + 1, arg.length);
			if (opt == 1 || opt == "yes") {
				dryRun = true;
			}
		} else if (opt == "compiler") {
			compiler = arg.substring(opt.length + 1, arg.length);
		} else {
			error = 1;
		}
	} else if (i === 0) {
		if (arg == "help") {
			usage();
			WScript.Quit(0);
		}
	} else {
		error = 1;
	}
}


// If we fail here, it is because the user supplied an unrecognised argument.
if (error !== 0) {
	usage();
	WScript.Quit(error);
}

// Read the the version.
readVersion();
if (error !== 0) {
	WScript.Echo("Version discovery failed, aborting.");
	WScript.Quit(error);
}

newfile = srcDir + "\\modbus-version.h";
createVersionedFile(newfile, srcDir + "\\modbus-version.h.in");
if (error !== 0) {
	WScript.Echo("Creation of " + newfile + " failed, aborting.");
	WScript.Quit(error);
}

newfile = "modbus.dll.manifest";
createVersionedFile(newfile, "modbus.dll.manifest.in");
if (error !== 0) {
	WScript.Echo("Creation of " + newfile + " failed, aborting.");
	WScript.Quit(error);
}

newfile = "config.h";
createVersionedFile(newfile, "config.h.win32");
if (error !== 0) {
	WScript.Echo("Creation of " + newfile + " failed, aborting.");
	WScript.Quit(error);
}

WScript.Echo("\nLibmodbus configuration completed\n");