using System;
using System.Runtime.InteropServices;
using System.Security.Permissions;
using Microsoft.SharePoint;
using Microsoft.SharePoint.Security;

//Code courtesy of @timferro, @dannyjessee, MSDN, and the internet
namespace SharePointProject1.Features.Feature1
{
    /// <summary>
    /// This class handles events raised during feature activation, deactivation, installation, uninstallation, and upgrade.
    /// </summary>
    /// <remarks>
    /// The GUID attached to this class may be used during packaging and should not be modified.
    /// </remarks>

    [Guid("7fc8877e-a88a-45d2-9463-3f640a2b4be7")]
    public class Feature1EventReceiver : SPFeatureReceiver
    {
        // Uncomment the method below to handle the event raised after a feature has been activated.

        public override void FeatureActivated(SPFeatureReceiverProperties properties)
        {
            //Add event receiver to Custom List
            using (SPWeb web = properties.Feature.Parent as SPWeb)
            {
                SPSecurity.RunWithElevatedPrivileges(delegate()
                {
                    SPList list = web.Lists["TestCustom"];
                    AddCustomEventReceivers(list);
                });
            }
        }

        private void AddCustomEventReceivers(SPList list)
        {
            //Clear any existing event receivers from list
            ClearExistingCustomEventReceivers(list);

            //Add new custom event receivers
            string asmName = "SharePointProject1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=43a1773c7939c303";
            string itemReceiverName = "SharePointProject1.EventReceiver1.EventReceiver1";
            list.EventReceivers.Add(SPEventReceiverType.ItemAdded, asmName, itemReceiverName);
            list.EventReceivers.Add(SPEventReceiverType.ItemUpdated, asmName, itemReceiverName);
            list.EventReceivers.Add(SPEventReceiverType.ItemUpdating, asmName, itemReceiverName);
            list.EventReceivers.Add(SPEventReceiverType.ItemDeleted, asmName, itemReceiverName);
            list.EventReceivers.Add(SPEventReceiverType.ItemDeleting, asmName, itemReceiverName);

        }

        private void ClearExistingCustomEventReceivers(SPList list)
        {
            for (int x = list.EventReceivers.Count - 1; x >= 0; x--)
            {
                SPEventReceiverDefinition rcv = list.EventReceivers[x];
                if(rcv.Assembly.Contains("SharePointProject1"))
                {
                    list.EventReceivers[x].Delete();
                }
            }
        }

        // Uncomment the method below to handle the event raised before a feature is deactivated.

        public override void FeatureDeactivating(SPFeatureReceiverProperties properties)
        {

        }


        // Uncomment the method below to handle the event raised after a feature has been installed.

        public override void FeatureInstalled(SPFeatureReceiverProperties properties)
        {
        }


        // Uncomment the method below to handle the event raised before a feature is uninstalled.

        public override void FeatureUninstalling(SPFeatureReceiverProperties properties)
        {
        }

        // Uncomment the method below to handle the event raised when a feature is upgrading.

        //public override void FeatureUpgrading(SPFeatureReceiverProperties properties, string upgradeActionName, System.Collections.Generic.IDictionary<string, string> parameters)
        //{
        //}
    }
}