using System;
using System.Collections.Generic;
using System.Linq;
using Telligent.Evolution.Extensibility;
using Telligent.Evolution.Extensibility.Api.Entities.Version1;
using Telligent.Evolution.Extensibility.Api.Version1;
using Telligent.Evolution.Extensibility.Content.Version1;

namespace Samples
{
    public class MyNotifications : INotificationType
    {
        private INotificationController _notificationController;

        #region IPlugin

        public string Name
        {
            get { return "My Notifications Plugin"; }
        }

        public string Description
        {
            get { return "This plugin will demo how the INotificationType plugin works"; }
        }

        public void Initialize()
        {
            Apis.Get<IComments>().Events.AfterCreate += CommentEvents_AfterCreate;
        }
        
        #endregion
        
        #region INotificationType
        
        public string NotificationTypeName
        {
            get { return "Notification Sample"; }
        }

        public string NotificationTypeDescription
        {
            get { return "Sends a sample notification."; }
        }

        public string NotificationTypeCategory
        {
            get { return "Samples"; }
        }

        public Guid NotificationTypeId
        {
            get { return new Guid("3C0542FD-5AB0-4386-911C-86CCF530BAEE"); }
        }

        public bool IsCacheable
        {
            get { return true; }
        }

        public bool VaryCacheByUser
        {
            get { return true; }
        }

        public bool CanDeleteNotification(Guid notificationId, int userId)
        {
            var notification = Apis.Get<INotifications>().Get(notificationId);
            return notification != null && notification.UserId == userId;
        }

        public string GetMessage(Guid notificationId, string target)
        {
            var notification = Apis.Get<INotifications>().Get(notificationId);
            if (notification == null || notification.ExtendedAttributes == null) { return null; }

            var commentIdAttribute = notification.ExtendedAttributes.FirstOrDefault(ea => ea.Key == "TargetCommentId");
            if (commentIdAttribute == null) { return null; }

            var commentId = Guid.Parse(commentIdAttribute.Value);
            var comment = Apis.Get<IComments>().Get(commentId);
            if (comment == null) { return null; }

            var user = Apis.Get<IUsers>().Get(new UsersGetOptions { Id = notification.UserId });
            if (user == null) { return null; }

            return string.Format("The following comment was added by {0}: \"{1}\"", user.DisplayName, comment.Body());
        }
        
        public string GetTargetUrl(Guid notificationId)
        {
            var notification = Apis.Get<INotifications>().Get(notificationId);
            return notification != null && notification.Content != null ? notification.Content.Url : null;
        }

        public void SetController(INotificationController controller)
        {
            _notificationController = controller;
        }

        #endregion

        private void CommentEvents_AfterCreate(CommentAfterCreateEventArgs e)
        {
            if (e == null
                || e.Content == null
                || e.User == null
                || !e.IsApproved
                || !e.Content.CreatedByUserId.HasValue
                || e.CommentTypeId.GetValueOrDefault(Guid.Empty) != Guid.Empty)
            {
                return;
            }

            var comment = Apis.Get<IComments>().Get(e.CommentId);
            if (comment != null && comment.IsApproved)
            {
                AddNotifications(e.Content.ContentId, e.Content.ContentTypeId, e.CommentId, e.Content.CreatedByUserId.Value, e.UserId);
            }
        }

        private void AddNotifications(Guid contentId, Guid contentTypeId, Guid commentId, int contentAuthor, int actorId)
        {
            var comment = Apis.Get<IComments>().Get(commentId);
            if (comment == null) { return; }

            var attributes = new List<IExtendedAttribute>
            {
                new ExtendedAttribute {Key = "TargetCommentId", Value = comment.CommentId.ToString("N")}
            };

            _notificationController.CreateUpdate(new NotificationCreateUpdateOptions
            {
                ContentId = contentId,
                ContentTypeId = contentTypeId,
                LastUpdate = DateTime.UtcNow,
                UserId = contentAuthor,
                ActorIdToAdd = actorId,
                ExtendedAttributes = attributes
            });
        }

    }
}