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

namespace MyActivityStory
{
    public class MyActivityStory : IActivityStoryType
    {
        public string Name
        {
            get { return "My Activity Story Plugin"; }
        }

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

        public void Initialize()
        {
            Apis.Get<IComments>().Events.AfterCreate += EventsOnAfterCreate;
        }

        private void EventsOnAfterCreate(CommentAfterCreateEventArgs e)
        {
            // Check to make sure the comment is for content via the REST API and not a comment on content.
            if (e.Content.ContentTypeId == new Guid("68C65AF2-AA15-4E4C-9C81-155C6A3159F6"))
            {
                CommentCreateStory(e.CommentId);
            }
        }

        public Guid StoryTypeId
        {
            get { return new Guid("c0bd2266-09ba-4304-aa60-eb58e4157d72"); }
        }

        public string StoryTypeName
        {
            get { return "My Activity Stories"; }
        }

        public string StoryTypeDescription
        {
            get { return "Controls activity stories for My Activity Stories."; }
        }

        public bool CanDeleteStory(Guid storyId, int userId)
        {
            // unregistered users cannot delete stories
            var user = Apis.Get<IUsers>().Get(new UsersGetOptions { Id = userId });
            var userIsRegistered = user != null && !user.IsSystemAccount.GetValueOrDefault(false);
            if (!userIsRegistered)
            {
                return false;
            }

            // actors can delete
            var story = Apis.Get<ActivityStories>().Get(storyId);
            return story != null && story.Actors != null && story.Actors.ToList().Exists(actor => actor.UserId == userId);
        }

        public Guid[] ContentTypeIds
        {
            get { return new[] { Apis.Get<IComments>().ContentTypeId }; }
        }

        public string GetPreviewHtml(IActivityStory story, Target target)
        {
            var content = Apis.Get<Contents>().Get(story.ContentId.GetValueOrDefault(), story.ContentTypeId.GetValueOrDefault());
            if (content == null) return null;

            return string.Format("<h3>{0}</h3>", content.HtmlName("Web"));
        }

        public string GetViewHtml(IActivityStory story, Target target)
        {
            var content = Apis.Get<Contents>().Get(story.ContentId.GetValueOrDefault(), story.ContentTypeId.GetValueOrDefault());
            if (content == null) return null;

            return $"<h3>A comment was created</h3><p>{content.HtmlName("Web")}</p>";
        }

        public int? GetPrimaryUser(IActivityStory story)
        {
            if (story == null || story.Actors == null || story.Actors.Count == 0)
            {
                return null;
            }

            return story.Actors.Last().UserId;
        }

        private IActivityStoryController _storyController;

        public void SetController(IActivityStoryController controller)
        {
            _storyController = controller;
        }

        public bool IsCacheable
        {
            get { return true; }
        }

        public bool VaryCacheByUser
        {
            get { return true; }
        }

        private void CommentCreateStory(Guid commentId)
        {
            var comment = Apis.Get<IComments>().Get(commentId);

            _storyController.Create(new ActivityStoryCreateOptions
            {
                ContentId = comment.ContentId,
                ContentTypeId = comment.ContentTypeId,
                LastUpdate = DateTime.UtcNow,
                Actors = new List<ActivityStoryActor>
                {
                    new ActivityStoryActor
                    {
                        UserId = comment.UserId,
                        Verb = "Add",
                        Date = DateTime.UtcNow
                    }
                }
            });
        }

    }
}