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//*[cli-fixwdate.cs]*********************[http://code.google.com/p/obremsdk/]*
//
// C# .NET 2.0 CLI Tool: Fix LastWriteTime (DateLastModified)
//
//-[Usage]--------------------------------------------------------------------
//
// Single file:
//
//	fixwdate <filename> <newdate>
//
// Multiple files (names must contain new date):
//
//	fixwdate /<regular-expression>/
//
// For example:
//
//	fixwdate example.txt "2008-01-16 1:15 PM"
//
// Example of RAZR picture files having date fixed:
//
//	fixwdate "/^(?<month>\d{2})(?<day>\d{2})(?<year>\d{2})_(?<hour>\d{2})(?<minute>\d{2})(?<second>)/"
//
//-[History]------------------------------------------------------------------
// 2008-01-16 by NeilO .... Created.
//
// (C)opyright 2008++ by Neil C. Obremski;                     New BSD License
//***********************[http://www.opensource.org/licenses/bsd-license.php]*
using System;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

[assembly: AssemblyTitle("FixLastWriteTime")]
[assembly: AssemblyDescription("Fixes the LastWriteTime (DateLastModified) property of a single file OR a group of files whose names indicate a date.")]
[assembly: AssemblyCompany("Neil C. Obremski")]
[assembly: AssemblyProduct("FixLastWriteTime")]
[assembly: AssemblyCopyright("Copyright ©  2008")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
[assembly: ComVisible(false)]
[assembly: Guid("80a695da-70e4-4861-b18e-abee1840f470")]
[assembly: AssemblyVersion("0.1.0.0")]
[assembly: AssemblyFileVersion("0.1.0.0")]

public class FixLastWriteTime
{
    static int Main(string[] args)
    {
    	if (0 == args.Length)
    	{
    		Console.WriteLine("Missing arguments; " +
    			"use 'fixwdate <file> <date>' for single file.");
    		return -1;
    	}
    	else if (2 == args.Length)
    	{
    		DateTime newdate = DateTime.Parse(args[1]);
    	
    		if (!File.Exists(args[0]))
    		{
    			Console.WriteLine("File not found: {0}", args[0]);
    			return -2;
    		}

    		FileInfo fi = new FileInfo(args[0]);
            Console.WriteLine("Set \"{0}\" Modified Date to {1}",
                fi.Name, newdate.ToString());
    		fi.LastWriteTime = newdate;
    	}
    	else if (1 == args.Length)
    	{
    		// parse the regular expression
    		string rp = args[0];
    		if ('/' != rp[0] || '/' != rp[rp.Length - 1])
    		{
    			Console.WriteLine("Invalid regular expression; " +
    				"specify as /<pattern>/");
    			return -1;
    		}

    		Regex re = new Regex(rp.Substring(1, rp.Length-2),
    			RegexOptions.IgnoreCase);
            string[] groups = re.GetGroupNames();

            //
            // enumerate files in current directory
            //
            foreach (string fn in Directory.GetFiles(
                Directory.GetCurrentDirectory()))
            {
                FileInfo fi = new FileInfo(fn);
                Match m = re.Match(fi.Name);
                if (!m.Success)
                    continue;

                // figure out new date time by adding each component to a base
                // where each component is relative to TODAY
                DateTime d = DateTime.Now;
                int year = d.Year;
                int month = d.Month;
                int day = d.Day;
                int hour = d.Hour;
                int minute = d.Minute;
                int second = d.Second;
                for (int i = 0; i < groups.Length; i++)
                {
                    string v = m.Groups[groups[i]].Value;

                    switch (groups[i])
                    {
                        case "year":

                            if ("" == v)
                                break;

                            // year can be 1, 2, or 4 digits
                            year = Convert.ToInt32(v);
                            if (year < 80)
                                year += 2000;
                            else if (year < 100)
                                year += 1900;
                            break;

                        case "month":

                            if ("" == v)
                                break;

                            month = Convert.ToInt32(v);
                            break;

                        case "day":
                            if ("" == v)
                                break;

                            day = Convert.ToInt32(v);
                            break;

                        case "hour":
                            if ("" == v)
                                hour = 0;
                            else
                                hour = Convert.ToInt32(v);
                            break;

                        case "minute":
                            if ("" == v)
                                minute = 0;
                            else
                                minute = Convert.ToInt32(v);
                            break;

                        case "second":
                            if ("" == v)
                                second = 0;
                            else
                                second = Convert.ToInt32(v);
                            break;
                    }
                }

                DateTime newdate = new DateTime(year, month, day,
                    hour, minute, second);
                Console.WriteLine("Set \"{0}\" Modified Date to {1}",
                    fi.Name, newdate.ToString());
                fi.LastWriteTime = newdate;
            }
    	}
    	else
    	{
    		Console.WriteLine("Invalid argument count; " +
    			"use 'fixwdate <file> <date>' for single file.");
    		return -1;
    	}

        return 0;

    } // Main()

} // FixLastWriteTime class