using System;
using System.Runtime.InteropServices;

namespace ProcessHackerRestartRecovery
{
    /// <summary>
    /// The Delegate that represents the callback method invoked by the system when an application has registered for application recovery. 
    /// </summary>
    /// <param name="state">An application-defined state object that is passed to the callback method.</param>
    /// <remarks>The callback method will be invoked prior to the application being terminated by Windows Error Reporting (WER). 
    /// To keep WER from terminating the application before the callback method completes, the callback method must
    /// periodically call the ApplicationRestartRecoveryManager.ApplicationRecoveryInProgress method.</remarks>
    public delegate int RecoveryCallback(object state);

    /// <summary>
    /// Defines a class that contains a callback delegate and properties of the application as defined by the user.
    /// </summary>
    public class RecoveryData
    {
        /// <summary>
        /// Initializes a recovery data wrapper with a callback method and the current state of the application.
        /// </summary>
        /// <param name="callback">The callback delegate.</param>
        /// <param name="state">The current state of the application.</param>
        public RecoveryData(RecoveryCallback callback, object state)
        {
            Callback = callback;
            State = state;
        }

        /// <summary>
        /// Gets or sets a value that determines the recovery callback function.
        /// </summary>
        public RecoveryCallback Callback { get; set; }

        /// <summary>
        /// Gets or sets a value that determines the application state.
        /// </summary>
        public object State { get; set; }

        /// <summary>
        /// Invokes the recovery callback function.
        /// </summary>
        public void Invoke()
        {
            if(Callback != null)
                Callback(State);
        }
    }
}