#region Copyright ©  2003-2008 Richard Beauchamp <rbeauchamp@gmail.com>

/*
* DomainObjects for .NET
* Copyright ©  2003-2008 Richard Beauchamp
*
* 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
*/

#endregion

using System;
using System.Text;

namespace DomainObjects.Tutorial
{
  public class TutorialClient
  {
    /// <summary>
    /// The main entry point for the application. Parses the command line entry.
    /// </summary>
    [STAThread]
    private static void Main(string[] args)
    {
      if (args == null || args.Length == 0)
      {
        DisplayHelpMessage();
        return;
      }

      try
      {
        string starName = null;
        string planetName = null;
        int nextArgType = 0;
        foreach (string arg in args)
        {
          switch (arg)
          {
            case "/hello":
              Console.WriteLine();
              DisplayHelloWorldResult();
              return;
            case "/create":
              if (args.Length != 4)
              {
                DisplayHelpMessage();
                return;
              }
              nextArgType = 1;
              break;
            case "/?":
            case "/help":
              DisplayHelpMessage();
              if (args.Length == 1)
              {
                return; //if only '/?' switch is specified, don't proceed
              }
              break;
            default:
              if (nextArgType == 1)
              {
                starName = arg;
                nextArgType = 2;
                break;
              }
              else if (nextArgType == 2)
              {
                planetName = arg;
                nextArgType = 3;
                break;
              }
              else if (nextArgType == 3)
              {
                Console.WriteLine();
                CreateNewStarAndPlanet(starName, planetName, arg);
                break;
              }
              else
              {
                Console.WriteLine();
                Console.WriteLine("Incorrect command-line specified. Use the '/?' switch for help.");
                break;
              }
          }
        }
      }
      catch (Exception ex)
      {
        Console.WriteLine("An error occured. Description -> " + GetExceptionMessage(ex));
      }
    }

    private static string GetExceptionMessage(Exception exception)
    {
      StringBuilder exceptionMessage = new StringBuilder();
      exceptionMessage.Append(exception.Message);
      exceptionMessage.Append(exception.StackTrace);
      exceptionMessage.Append("\n\r");
      while (exception.InnerException != null)
      {
        exception = exception.InnerException;
        exceptionMessage.Append(exception.Message);
        exceptionMessage.Append(exception.StackTrace);
        exceptionMessage.Append("\n\r");
      }
      return exceptionMessage.ToString();
    }

    /// <summary>
    /// Handle the /hello command line switch
    /// </summary>
    private static void DisplayHelloWorldResult()
    {
      // get the singleton instance of TransactionFacade
      TransactionFacade facade = TransactionFacade.Instance;

      Planet planet = facade.HelloWorld();

      if (planet == null)
      {
        Console.WriteLine("No instance of Planet with the name of 'Earth' was found! " + "You need to create a row in both the SUN and PLANET tables and set the value of the PLANET.NAME column to 'Earth'.");
      }
      else
      {
        Console.WriteLine("Hello from planet earth!! You found me in the database!!");
      }
    }

    /// <summary>
    /// Handle the /create command line switch
    /// </summary>
    private static void CreateNewStarAndPlanet(string starName, string newPlanetName, string rotationalPeriodString)
    {
      decimal rotationalPeriod;

      // validate and parse the rotationalPeriodString parameter
      try
      {
        rotationalPeriod = Decimal.Parse(rotationalPeriodString);
      }
      catch (FormatException)
      {
        Console.WriteLine("Could not create the new star and planet: Please enter " + "a decimal value for the rotational period.");
        return;
      }

      // get the singleton instance of TransactionFacade
      TransactionFacade facade = TransactionFacade.Instance;

      // create the new star and planet
      try
      {
        facade.CreateNewStarAndPlanet(starName, newPlanetName, rotationalPeriod);

        // successful!
        Console.WriteLine("Created a new star with name '" + starName + "' and created a new planet with name '" + newPlanetName + "' and rotational period of '" + rotationalPeriodString + "'!");
      }
      catch (Exception ex)
      {
        Console.WriteLine("Could not create a new star and planet because of an " + "exception! The message is: " + ex);
      }
    }

    private static void DisplayHelpMessage()
    {
      Console.WriteLine();
      Console.WriteLine("USAGE: ");
      Console.WriteLine("helloworld [/hello /create <starName> <planetName> <rotationalPeriod>]");
      Console.WriteLine("Available command-line switches:");
      Console.WriteLine("/hello - Call the HelloWorld() method on the TransactionFacade class.");
      Console.WriteLine("/create - Create a new instance of Star with the given <starName> ");
      Console.WriteLine("          and, in the same transaction, create a new instance Planet ");
      Console.WriteLine("          associated with the new Star, that has the given <planetName> and <rotationalPeriod>.");
      Console.WriteLine();
    }
  }
}