// <copyright file="Host01.cs" company="Microsoft Corporation">
// Copyright (c) 2009 Microsoft Corporation. All rights reserved.
// </copyright>
// DISCLAIMER OF WARRANTY: The software is licensed “as-is.” You 
// bear the risk of using it. Microsoft gives no express warranties, 
// guarantees or conditions. You may have additional consumer rights 
// under your local laws which this agreement cannot change. To the extent 
// permitted under your local laws, Microsoft excludes the implied warranties 
// of merchantability, fitness for a particular purpose and non-infringement.

namespace Microsoft.Samples.PowerShell.Host
{
    using System;
    using System.Management.Automation;
    using System.Management.Automation.Runspaces;
    using PowerShell = System.Management.Automation.PowerShell;

    /// <summary>
    /// This class contains the Main entry point for this host application.
    /// </summary>
    internal class Host01
    {
        /// <summary>
        /// Indicator to tell the host application that it should exit.
        /// </summary>
        private bool shouldExit;

        /// <summary>
        /// The exit code that the host application will use to exit.
        /// </summary>
        private int exitCode;

        /// <summary>
        /// Gets or sets a value indicating whether the 
        /// host application should exit.
        /// </summary>
        public bool ShouldExit
        {
            get { return this.shouldExit; }
            set { this.shouldExit = value; }
        }

        /// <summary>
        /// Gets or sets the PSHost implementation will
        /// use to tell the host application what code to use
        /// when exiting.
        /// </summary>
        public int ExitCode
        {
            get { return this.exitCode; }
            set { this.exitCode = value; }
        }

        /// <summary>
        /// This sample uses the PowerShell class to execute
        /// a script that calls exit. The host application looks at
        /// this and prints out the result.
        /// </summary>
        /// <param name="args">Parameter not used.</param>
        private static void Main(string[] args)
        {
            // Create an instance of this class so that the engine will have
            // access to the ShouldExit and ExitCode parameters.
            Host01 me = new Host01();

            // Now create the host instance to use
            MyHost myHost = new MyHost(me);

            // Pass this in when creating the runspace and invoker...
            using (Runspace myRunSpace = RunspaceFactory.CreateRunspace(myHost))
            {
                myRunSpace.Open();

                // Create a PowerShell to execute our commands...
                using (PowerShell powershell = PowerShell.Create())
                {
                    powershell.Runspace = myRunSpace;

                    // Now use the runspace invoker to execute the script "exit (2+2)"
                    string script = "exit (2+2)";
                    powershell.AddScript(script);
                    powershell.Invoke(script);
                }

                // Check the flags and see if they were set propertly...
                Console.WriteLine(
                    "ShouldExit={0} (should be True); ExitCode={1} (should be 4)",
                    me.ShouldExit, 
                    me.ExitCode);

                // close the runspace...
                myRunSpace.Close();
            }

            Console.WriteLine("Hit any key to exit...");
            Console.ReadKey();
        }
    }
}