////////////////////////////////////////////////////////////////////////////////
// Proof that the bug in Select-Object didn't need to be there. You can detect whether
// the input is passed in on the pipeline or as a paramenter.  If it's from the pipeline, then it 
// will NOT be present at BeginProcess() but if you pass it in as an argument, then it will.
//
// Try it out:   "a","b","c"| Test-Pipeline -verbose
// Versus this:  Test-Pipeline -verbose -input @("a","b","c")
////////////////////////////////////////////////////////////////////////////////
using System;
using System.Collections.Generic;
using System.Text;
using System.Management.Automation;
using System.Collections;

namespace Huddled.TestSnapin
{
    [Cmdlet(VerbsDiagnostic.Test, "Pipeline")]
    public class TestPipelineCommand : Cmdlet
    {

        #region Parameters
        [Parameter(Position = 0,
            Mandatory = false,
            ValueFromPipelineByPropertyName = false,
            HelpMessage = "Help Text"), ValidateNotNullOrEmpty]
        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
        private string _name = "TestPipeline";


        [Parameter(Position = 1,
            Mandatory = false,
            ValueFromPipeline = true,
            HelpMessage = "Help Text"), ValidateNotNullOrEmpty]
        public string[] InputObject
        {
            get { return _input; }
            set { _input = value; }
        }
        private string[] _input;


        #endregion
        protected override void BeginProcessing()
        {
            WriteVerbose(String.Format("Begin Processing {0}", Name));
            if (_input != null && _input.Length > 0)
            {
                throw new ArgumentException("You cannot pass data to <Test-Pipeline> via the InputObject parameter, you must pass it via the pipeline.", "InputObject");
            }
            base.BeginProcessing();
        }

        protected override void ProcessRecord()
        {
            if (_input != null && _input.Length > 0)
            {
                foreach (string input in _input)
                {
                    WriteVerbose(String.Format("Process: {0}", input));
                    WriteObject(input);
                }
            }
        }

        protected override void EndProcessing()
        {
            WriteVerbose(String.Format("End Processing {0}", Name));
            base.EndProcessing();
        }
    }
}