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using System;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAPI;

namespace XenAdmin.Actions
{
    /// <summary>
    /// An action which just runs a delegate.
    /// It is bad style to use this for more than the very simplest delegate: preferably just a single API call.
    /// Anything more complicated should be turned into a proper action of its own.
    /// </summary>
    public class DelegatedAsyncAction : AsyncAction
    {
        private readonly Action<Session> invoker;
        private readonly Func<Session, object> function;
        private readonly string endDescription;

        //TODO: this should move to AsyncAction and replace Result really
        public object ResultObject { get; private set; }

        public DelegatedAsyncAction(IXenConnection connection, string title, string startDescription, string endDescription,
            Action<Session> invoker, params string[] rbacMethods)
            : this(connection, title, startDescription, endDescription, invoker, false, rbacMethods)
        {
        }

        public DelegatedAsyncAction(IXenConnection connection, string title, string startDescription, string endDescription,
            Action<Session> invoker, bool suppressHistory, params string[] rbacMethods)
            : base(connection, title, startDescription, suppressHistory)
        {
            this.endDescription = endDescription;
            this.invoker = invoker;
            ApiMethodsToRoleCheck = new RbacMethodList(rbacMethods);
        }

        public DelegatedAsyncAction(IXenConnection connection, string title, string startDescription, string endDescription,
            Func<Session, object> function, params string[] rbacMethods)
            : this(connection, title, startDescription, endDescription, function, false, rbacMethods)
        {
        }

        public DelegatedAsyncAction(IXenConnection connection, string title, string startDescription, string endDescription,
            Func<Session, object> function, bool suppressHistory, params string[] rbacMethods)
            : base(connection, title, startDescription, suppressHistory)
        {
            this.endDescription = endDescription;
            this.function = function;
            ApiMethodsToRoleCheck = new RbacMethodList(rbacMethods);
        }


        protected override void Run()
        {
            if (invoker != null)
                invoker(Session);
            else if (function != null)
                ResultObject = function(Session);

            Description = endDescription;
        }
    }
}