#region Disclaimer / License
// Copyright (C) 2011, Kenneth Skovhede
// http://www.hexad.dk, opensource@hexad.dk
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
// 
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
// 
#endregion
using System;
using System.Collections.Generic;
using System.Text;

namespace Duplicati.Library.Snapshots
{
    static class Program
    {
        private static Dictionary<string, string> ExtractOptions(List<string> args)
        {
            Dictionary<string, string> options = new Dictionary<string, string>();

            for (int i = 0; i < args.Count; i++)
            {
                if (args[i].StartsWith("--"))
                {
                    string key = null;
                    string value = null;
                    if (args[i].IndexOf("=") > 0)
                    {
                        key = args[i].Substring(0, args[i].IndexOf("="));
                        value = args[i].Substring(args[i].IndexOf("=") + 1);
                    }
                    else
                        key = args[i];

                    //Skip the leading --
                    key = key.Substring(2).ToLower();
                    if (!string.IsNullOrEmpty(value) && value.Length > 1 && value.StartsWith("\"") && value.EndsWith("\""))
                        value = value.Substring(1, value.Length - 2);

                    //Last argument overwrites the current
                    options[key] = value;

                    args.RemoveAt(i);
                    i--;
                }
            }

            return options;
        }

        public static void Main(string[] _args)
        {
            try
            {
                List<string> args = new List<string>(_args);
                Dictionary<string, string> options = ExtractOptions(args);
                
                if (args.Count == 0)
                    args = new List<string> { System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetExecutingAssembly().Location) };

                if (args.Count != 1)
                {
                    Console.WriteLine(@"Usage:
Duplicati.Library.Snapshots.exe [test-folder]

Where <test-folder> is the folder where files will be locked/created etc");
                    return;
                }

                if (Library.Utility.Utility.ParseBoolOption(options, "usn-test"))
                {
                    using (USNHelper usn = new USNHelper(args[0]))
                    {
                        Console.WriteLine("Current USN JournalID: " + usn.JournalID);
                        Console.WriteLine("Current USN no: " + usn.USN);

                        if (options.ContainsKey("last-usn"))
                        {
                            Console.WriteLine("Changed entries ...");
                            foreach (string s in usn.GetChangedFileSystemEntries(args[0], long.Parse(options["last-usn"])))
                                Console.WriteLine(s + ", " + usn.GetChangeFlags(s));

                            Console.WriteLine();
                            Console.WriteLine("Renamed entries ...");
                            foreach (string s in usn.GetRenamedFileSystemEntries(args[0], long.Parse(options["last-usn"])))
                                Console.WriteLine(s);
                        }
                        else
                        {
                            Console.WriteLine("Files ...");
                            foreach (string s in usn.Files)
                                Console.WriteLine(s);

                            Console.WriteLine();
                            Console.WriteLine("Folders ...");

                            foreach (string s in usn.Folders)
                                Console.WriteLine(s);
                        }
                    }
                }
                else
                {
                    if (!System.IO.Directory.Exists(args[0]))
                        System.IO.Directory.CreateDirectory(args[0]);

                    string filename = System.IO.Path.Combine(args[0], "testfile.bin");

                    Console.WriteLine(string.Format("Creating file {0}", filename));

                    using (System.IO.FileStream fs = new System.IO.FileStream(filename, System.IO.FileMode.Create, System.IO.FileAccess.ReadWrite, System.IO.FileShare.None))
                    {
                        Console.WriteLine(string.Format("Attempting to read locked file {0}", filename));

                        try
                        {
                            using (System.IO.FileStream fs2 = new System.IO.FileStream(filename, System.IO.FileMode.Create, System.IO.FileAccess.ReadWrite, System.IO.FileShare.None))
                            { }

                            Console.WriteLine(string.Format("Could open locked file {0}, cannot test", filename));
                            Console.WriteLine("* Test failed");
                            return;
                        }
                        catch (Exception ex)
                        {
                            Console.WriteLine(string.Format("The file {0} was correctly locked, message: {1}", filename, ex.Message));
                        }

                        Console.WriteLine("Creating snapshot for folder: {0}", args[0]);
                        Console.WriteLine("If this fails, try to run as " + (Utility.Utility.IsClientLinux ? "root" : "Administrator"));
                        using (ISnapshotService snapshot = SnapshotUtility.CreateSnapshot(new string[] { args[0] }, options))
                        {
                            Console.WriteLine("Attempting to read locked file via snapshot");
                            try
                            {
                                using (System.IO.Stream s = snapshot.OpenRead(filename))
                                { }

                                Console.WriteLine(string.Format("Could open locked file {0}, through snapshot", filename));
                            }
                            catch (Exception ex)
                            {
                                Console.WriteLine(string.Format("The file {0} was locked even through snapshot, message: {1}", filename, ex.ToString()));
                                Console.WriteLine("* Test failed");
                                return;
                            }
                        }
                    }

                    Console.WriteLine("* Test passed");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(string.Format("The snapshot tester failed: {0}", ex.ToString()));
                Console.WriteLine("* Test failed");
            }

        }
    }
}