using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace PFCRip
{
  public class Startup
  {
    static void Main(string[] args)
    {
      try
      {
        const string SWITCH_PREFIX = "--";
        string fileName = String.Empty;
        bool ignoreErrors = false;
        bool noDirectoryRecursion = false;

        //Verify arguments
        foreach (var arg in args)
        {
          if (arg.StartsWith(SWITCH_PREFIX))
          {
            switch (arg.Substring(SWITCH_PREFIX.Length).ToLower())
            {
              case "ignore-errors":
                {
                  ignoreErrors = true;
                  break;
                }
              case "no-dir-recurse":
                {
                  noDirectoryRecursion = true;
                  break;
                }
              default:
                {
                  throw new InvalidOperationException("Invalid argument: " + arg);
                }
            }
          }
          else
          {
            if (String.IsNullOrEmpty(fileName))
              fileName = arg;
            else
              throw new InvalidOperationException(String.Format("File name specified twice: {0}, {1}", fileName, arg));
          }
        }

        //Open file and read in all information
        Console.WriteLine(String.Format("Reading file {0}...", fileName));
        var file = new System.IO.FileStream(fileName, System.IO.FileMode.Open);
        var data = new byte[file.Length];
        file.Read(data, 0, data.Length);
        file.Close();

        //Now create our PFC object
        var pfc = new PFCFile(data, ignoreErrors);

        //Now rip out the data
        pfc.ExtractFavorites(System.IO.Directory.GetCurrentDirectory(), noDirectoryRecursion);

        Console.WriteLine();
        Console.WriteLine("Extraction successful.");
      }
      catch (Exception ex)
      {
        _DisplayUsage(ex);
      }
    }

    private static void _DisplayUsage()
    {
      _DisplayUsage(null);
    }

    private static void _DisplayUsage(Exception ex)
    {
      var asm = System.Reflection.Assembly.GetExecutingAssembly();
      var name = asm.GetName();
      Console.WriteLine(name.Name + " v" + name.Version.ToString(3));
      Console.WriteLine();
      Console.WriteLine("Extracts information from an AOL PFC (Personal File Cabinet) file.");
      Console.WriteLine("As of right now it really just extracts favorites.");
      Console.WriteLine();
      Console.WriteLine("Usage: " + name.Name + " [switches] [file name]");
      Console.WriteLine("Valid switches are:");
      Console.WriteLine("\t--ignore-errors  Ignores errors in file.");
      Console.WriteLine("\t--no-dir-recurse Only store directories one level deep.");
      Console.WriteLine("\t                   (Works around long file paths.)");
      Console.WriteLine();
      if (ex != null)
        Console.WriteLine("ERROR: " + ex.ToString());
    }
  }
}