using System;
using System.Collections.Generic;
using System.Linq;
using Umbraco.Core;
using Umbraco.Core.Cache;
using Umbraco.Core.Configuration;
using Umbraco.Core.Models;
using Umbraco.Core.Persistence.Repositories;
using Umbraco.Core.Persistence.Repositories.Implement;
using Umbraco.Core.Services;
using Umbraco.Core.Services.Changes;
using Umbraco.Web.Composing;
using Umbraco.Web.PublishedCache;

namespace Umbraco.Web.Cache
{
    public sealed class ContentCacheRefresher : PayloadCacheRefresherBase<ContentCacheRefresher, ContentCacheRefresher.JsonPayload>
    {
        private readonly IPublishedSnapshotService _publishedSnapshotService;
        private readonly IdkMap _idkMap;
        private readonly IDomainService _domainService;

        public ContentCacheRefresher(AppCaches appCaches, IPublishedSnapshotService publishedSnapshotService, IdkMap idkMap, IDomainService domainService)
            : base(appCaches)
        {
            _publishedSnapshotService = publishedSnapshotService;
            _idkMap = idkMap;
            _domainService = domainService;
        }

        #region Define

        protected override ContentCacheRefresher This => this;

        public static readonly Guid UniqueId = Guid.Parse("900A4FBE-DF3C-41E6-BB77-BE896CD158EA");

        public override Guid RefresherUniqueId => UniqueId;

        public override string Name => "ContentCacheRefresher";

        #endregion

        #region Refresher

        public override void Refresh(JsonPayload[] payloads)
        {
            AppCaches.RuntimeCache.ClearOfType<PublicAccessEntry>();

            var idsRemoved = new HashSet<int>();
            var isolatedCache = AppCaches.IsolatedCaches.GetOrCreate<IContent>();

            foreach (var payload in payloads)
            {
                isolatedCache.Clear(RepositoryCacheKeys.GetKey<IContent>(payload.Id));

                _idkMap.ClearCache(payload.Id);

                // remove those that are in the branch
                if (payload.ChangeTypes.HasTypesAny(TreeChangeTypes.RefreshBranch | TreeChangeTypes.Remove))
                {
                    var pathid = "," + payload.Id + ",";
                    isolatedCache.ClearOfType<IContent>((k, v) => v.Path.Contains(pathid));
                }

                //if the item is being completely removed, we need to refresh the domains cache if any domain was assigned to the content
                if (payload.ChangeTypes.HasTypesAny(TreeChangeTypes.Remove))
                {
                    idsRemoved.Add(payload.Id);
                }
            }

            if (idsRemoved.Count > 0)
            {
                var assignedDomains = _domainService.GetAll(true).Where(x => x.RootContentId.HasValue && idsRemoved.Contains(x.RootContentId.Value)).ToList();

                if (assignedDomains.Count > 0)
                {
                    // TODO: this is duplicating the logic in DomainCacheRefresher BUT we cannot inject that into this because it it not registered explicitly in the container,
                    // and we cannot inject the CacheRefresherCollection since that would be a circular reference, so what is the best way to call directly in to the
                    // DomainCacheRefresher?

                    ClearAllIsolatedCacheByEntityType<IDomain>();
                    // note: must do what's above FIRST else the repositories still have the old cached
                    // content and when the PublishedCachesService is notified of changes it does not see
                    // the new content...
                    // notify
                    _publishedSnapshotService.Notify(assignedDomains.Select(x => new DomainCacheRefresher.JsonPayload(x.Id, DomainChangeTypes.Remove)).ToArray());
                }
            }

            // note: must do what's above FIRST else the repositories still have the old cached
            // content and when the PublishedCachesService is notified of changes it does not see
            // the new content...

            // TODO: what about this?
            // should rename it, and then, this is only for Deploy, and then, ???
            //if (Suspendable.PageCacheRefresher.CanUpdateDocumentCache)
            //  ...

            _publishedSnapshotService.Notify(payloads, out _, out var publishedChanged);

            if (payloads.Any(x => x.ChangeTypes.HasType(TreeChangeTypes.RefreshAll)) || publishedChanged)
            {
                // when a public version changes
                AppCaches.ClearPartialViewCache();
            }

            base.Refresh(payloads);
        }

        // these events should never trigger
        // everything should be PAYLOAD/JSON

        public override void RefreshAll()
        {
            throw new NotSupportedException();
        }

        public override void Refresh(int id)
        {
            throw new NotSupportedException();
        }

        public override void Refresh(Guid id)
        {
            throw new NotSupportedException();
        }

        public override void Remove(int id)
        {
            throw new NotSupportedException();
        }

        #endregion

        #region Json

        public class JsonPayload
        {
            public JsonPayload(int id, TreeChangeTypes changeTypes)
            {
                Id = id;
                ChangeTypes = changeTypes;
            }

            public int Id { get; }

            public TreeChangeTypes ChangeTypes { get; }
        }

        #endregion

        #region Indirect

        public static void RefreshContentTypes(AppCaches appCaches)
        {
            // we could try to have a mechanism to notify the PublishedCachesService
            // and figure out whether published items were modified or not... keep it
            // simple for now, just clear the whole thing

            appCaches.ClearPartialViewCache();

            appCaches.IsolatedCaches.ClearCache<PublicAccessEntry>();
            appCaches.IsolatedCaches.ClearCache<IContent>();
        }

        #endregion

    }
}
