using System;
using System.Linq;
using Telerik.Sitefinity.Data;
using Telerik.Sitefinity.Scheduling;
using Telerik.Sitefinity.Security;

namespace SitefinityWebApp
{
    public class DeleteOrphanedUserProfilesTask : ScheduledTask
    {
        public DeleteOrphanedUserProfilesTask()
        {
            this.Key = TaskKey;
        }

        public override void ExecuteTask()
        {
            var transactionName = string.Concat("DeleteOrphanProfiles", Guid.NewGuid());

            var hasDeletionOccured = false;

            var providers = UserProfileManager.ProvidersCollection;

            foreach (var provider in providers)
            {
                var profileManager = UserProfileManager.GetManager(provider.Name, transactionName);

                var profiles = profileManager.GetUserProfiles();

                foreach (var profile in profiles)
                {
                    if (profile.User == null)
                    {
                        profileManager.Delete(profile);

                        hasDeletionOccured = true;
                    }
                }
            }

            if (hasDeletionOccured)
            {
                TransactionManager.CommitTransaction(transactionName);
            }
        }

        public static void SheduleTask(DateTime executeTime)
        {
            var schedulingManager = SchedulingManager.GetManager();

            var existingTask = schedulingManager.GetTaskData().FirstOrDefault(x => x.Key == TaskKey);

            if (existingTask == null)
            {
                var newTask = new DeleteOrphanedUserProfilesTask()
                {
                    ExecuteTime = executeTime
                };

                schedulingManager.AddTask(newTask);
            }
            else
            {
                existingTask.ExecuteTime = executeTime;
            }

            SchedulingManager.RescheduleNextRun();
            schedulingManager.SaveChanges();
        }

        public override string TaskName
        {
            get
            {
                return this.GetType().FullName;
            }
        }

        private static readonly string TaskKey = "8278E45E-9EBA-4EB9-9EE5-3201415A0AED";

    }
}