// Copyright (c) Umbraco.
// See LICENSE for more details.

using System.Collections.Generic;
using System.Linq;
using Microsoft.Extensions.DependencyInjection;
using NUnit.Framework;
using Umbraco.Cms.Core.Cache;
using Umbraco.Cms.Core.DependencyInjection;
using Umbraco.Cms.Core.Events;
using Umbraco.Cms.Core.Models;
using Umbraco.Cms.Core.Models.Membership;
using Umbraco.Cms.Core.Notifications;
using Umbraco.Cms.Core.Scoping;
using Umbraco.Cms.Core.Services;
using Umbraco.Cms.Core.Services.Implement;
using Umbraco.Cms.Core.Sync;
using Umbraco.Cms.Infrastructure.PublishedCache;
using Umbraco.Cms.Infrastructure.Sync;
using Umbraco.Cms.Tests.Common.Testing;
using Umbraco.Cms.Tests.Integration.Testing;
using Umbraco.Extensions;

namespace Umbraco.Cms.Tests.Integration.Umbraco.Infrastructure.Scoping
{
    [TestFixture]
    [UmbracoTest(Database = UmbracoTestOptions.Database.NewSchemaPerTest)]
    public class ScopedRepositoryTests : UmbracoIntegrationTest
    {
        private IUserService UserService => GetRequiredService<IUserService>();

        private ILocalizationService LocalizationService => GetRequiredService<ILocalizationService>();

        protected override void ConfigureTestServices(IServiceCollection services)
        {
            // this is what's created core web runtime
            var appCaches = new AppCaches(
                new DeepCloneAppCache(new ObjectCacheAppCache()),
                NoAppCache.Instance,
                new IsolatedCaches(type => new DeepCloneAppCache(new ObjectCacheAppCache())));

            services.AddUnique(appCaches);
        }

        protected override void CustomTestSetup(IUmbracoBuilder builder)
        {
            builder.AddNuCache();
            builder.Services.AddUnique<IServerMessenger, LocalServerMessenger>();
            builder
                .AddNotificationHandler<DictionaryItemDeletedNotification, DistributedCacheBinder>()
                .AddNotificationHandler<DictionaryItemSavedNotification, DistributedCacheBinder>()
                .AddNotificationHandler<LanguageSavedNotification, DistributedCacheBinder>()
                .AddNotificationHandler<LanguageDeletedNotification, DistributedCacheBinder>()
                .AddNotificationHandler<UserSavedNotification, DistributedCacheBinder>()
                .AddNotificationHandler<LanguageDeletedNotification, DistributedCacheBinder>()
                .AddNotificationHandler<MemberGroupDeletedNotification, DistributedCacheBinder>()
                .AddNotificationHandler<MemberGroupSavedNotification, DistributedCacheBinder>();
            builder.AddNotificationHandler<LanguageSavedNotification, PublishedSnapshotServiceEventHandler>();
        }

        [TestCase(true)]
        [TestCase(false)]
        public void DefaultRepositoryCachePolicy(bool complete)
        {
            var scopeProvider = (ScopeProvider)ScopeProvider;
            var service = (UserService)UserService;
            IAppPolicyCache globalCache = AppCaches.IsolatedCaches.GetOrCreate(typeof(IUser));
            var user = (IUser)new User(GlobalSettings, "name", "email", "username", "rawPassword");
            service.Save(user);

            // User has been saved so the cache has been cleared of it
            var globalCached = (IUser)globalCache.Get(GetCacheIdKey<IUser>(user.Id), () => null);
            Assert.IsNull(globalCached);
            // Get user again to load it into the cache again, this also ensure we don't modify the one that's in the cache.
            user = service.GetUserById(user.Id);

            // global cache contains the entity
            globalCached = (IUser)globalCache.Get(GetCacheIdKey<IUser>(user.Id), () => null);
            Assert.IsNotNull(globalCached);
            Assert.AreEqual(user.Id, globalCached.Id);
            Assert.AreEqual("name", globalCached.Name);

            Assert.IsNull(scopeProvider.AmbientScope);
            using (IScope scope = scopeProvider.CreateScope(repositoryCacheMode: RepositoryCacheMode.Scoped))
            {
                Assert.IsInstanceOf<Scope>(scope);
                Assert.IsNotNull(scopeProvider.AmbientScope);
                Assert.AreSame(scope, scopeProvider.AmbientScope);

                // scope has its own isolated cache
                IAppPolicyCache scopedCache = scope.IsolatedCaches.GetOrCreate(typeof(IUser));
                Assert.AreNotSame(globalCache, scopedCache);

                user.Name = "changed";
                service.Save(user);

                // scoped cache contains the "new" entity
                var scopeCached = (IUser)scopedCache.Get(GetCacheIdKey<IUser>(user.Id), () => null);
                Assert.IsNotNull(scopeCached);
                Assert.AreEqual(user.Id, scopeCached.Id);
                Assert.AreEqual("changed", scopeCached.Name);

                // global cache is unchanged
                globalCached = (IUser)globalCache.Get(GetCacheIdKey<IUser>(user.Id), () => null);
                Assert.IsNotNull(globalCached);
                Assert.AreEqual(user.Id, globalCached.Id);
                Assert.AreEqual("name", globalCached.Name);

                if (complete)
                {
                    scope.Complete();
                }
            }

            Assert.IsNull(scopeProvider.AmbientScope);

            globalCached = (IUser)globalCache.Get(GetCacheIdKey<IUser>(user.Id), () => null);
            if (complete)
            {
                // global cache has been cleared
                Assert.IsNull(globalCached);
            }
            else
            {
                // global cache has *not* been cleared
                Assert.IsNotNull(globalCached);
            }

            // get again, updated if completed
            user = service.GetUserById(user.Id);
            Assert.AreEqual(complete ? "changed" : "name", user.Name);

            // global cache contains the entity again
            globalCached = (IUser)globalCache.Get(GetCacheIdKey<IUser>(user.Id), () => null);
            Assert.IsNotNull(globalCached);
            Assert.AreEqual(user.Id, globalCached.Id);
            Assert.AreEqual(complete ? "changed" : "name", globalCached.Name);
        }

        [TestCase(true)]
        [TestCase(false)]
        public void FullDataSetRepositoryCachePolicy(bool complete)
        {
            var scopeProvider = (ScopeProvider)ScopeProvider;
            ILocalizationService service = LocalizationService;
            IAppPolicyCache globalCache = AppCaches.IsolatedCaches.GetOrCreate(typeof(ILanguage));

            var lang = (ILanguage)new Language(GlobalSettings, "fr-FR");
            service.Save(lang);

            // global cache has been flushed, reload
            var globalFullCached = (IEnumerable<ILanguage>)globalCache.Get(GetCacheTypeKey<ILanguage>(), () => null);
            Assert.IsNull(globalFullCached);
            ILanguage reload = service.GetLanguageById(lang.Id);

            // global cache contains the entity
            globalFullCached = (IEnumerable<ILanguage>)globalCache.Get(GetCacheTypeKey<ILanguage>(), () => null);
            Assert.IsNotNull(globalFullCached);
            ILanguage globalCached = globalFullCached.First(x => x.Id == lang.Id);
            Assert.IsNotNull(globalCached);
            Assert.AreEqual(lang.Id, globalCached.Id);
            Assert.AreEqual("fr-FR", globalCached.IsoCode);

            Assert.IsNull(scopeProvider.AmbientScope);
            using (IScope scope = scopeProvider.CreateScope(repositoryCacheMode: RepositoryCacheMode.Scoped))
            {
                Assert.IsInstanceOf<Scope>(scope);
                Assert.IsNotNull(scopeProvider.AmbientScope);
                Assert.AreSame(scope, scopeProvider.AmbientScope);

                // scope has its own isolated cache
                IAppPolicyCache scopedCache = scope.IsolatedCaches.GetOrCreate(typeof(ILanguage));
                Assert.AreNotSame(globalCache, scopedCache);

                // Use IsMandatory of isocode to ensure publishedContent cache is not also rebuild
                lang.IsMandatory = true;
                service.Save(lang);

                // scoped cache has been flushed, reload
                var scopeFullCached = (IEnumerable<ILanguage>)scopedCache.Get(GetCacheTypeKey<ILanguage>(), () => null);
                Assert.IsNull(scopeFullCached);
                reload = service.GetLanguageById(lang.Id);

                // scoped cache contains the "new" entity
                scopeFullCached = (IEnumerable<ILanguage>)scopedCache.Get(GetCacheTypeKey<ILanguage>(), () => null);
                Assert.IsNotNull(scopeFullCached);
                ILanguage scopeCached = scopeFullCached.First(x => x.Id == lang.Id);
                Assert.IsNotNull(scopeCached);
                Assert.AreEqual(lang.Id, scopeCached.Id);
                Assert.AreEqual(true, scopeCached.IsMandatory);

                // global cache is unchanged
                globalFullCached = (IEnumerable<ILanguage>)globalCache.Get(GetCacheTypeKey<ILanguage>(), () => null);
                Assert.IsNotNull(globalFullCached);
                globalCached = globalFullCached.First(x => x.Id == lang.Id);
                Assert.IsNotNull(globalCached);
                Assert.AreEqual(lang.Id, globalCached.Id);
                Assert.AreEqual(false, globalCached.IsMandatory);

                if (complete)
                {
                    scope.Complete();
                }
            }

            Assert.IsNull(scopeProvider.AmbientScope);

            globalFullCached = (IEnumerable<ILanguage>)globalCache.Get(GetCacheTypeKey<ILanguage>(), () => null);
            if (complete)
            {
                // global cache has been cleared
                Assert.IsNull(globalFullCached);
            }
            else
            {
                // global cache has *not* been cleared
                Assert.IsNotNull(globalFullCached);
            }

            // get again, updated if completed
            lang = service.GetLanguageById(lang.Id);
            Assert.AreEqual(complete ? true : false, lang.IsMandatory);

            // global cache contains the entity again
            globalFullCached = (IEnumerable<ILanguage>)globalCache.Get(GetCacheTypeKey<ILanguage>(), () => null);
            Assert.IsNotNull(globalFullCached);
            globalCached = globalFullCached.First(x => x.Id == lang.Id);
            Assert.IsNotNull(globalCached);
            Assert.AreEqual(lang.Id, globalCached.Id);
            Assert.AreEqual(complete ? true : false, lang.IsMandatory);
        }

        [TestCase(true)]
        [TestCase(false)]
        public void SingleItemsOnlyRepositoryCachePolicy(bool complete)
        {
            var scopeProvider = (ScopeProvider)ScopeProvider;
            ILocalizationService service = LocalizationService;
            IAppPolicyCache globalCache = AppCaches.IsolatedCaches.GetOrCreate(typeof(IDictionaryItem));

            var lang = (ILanguage)new Language(GlobalSettings, "fr-FR");
            service.Save(lang);

            var item = (IDictionaryItem)new DictionaryItem("item-key");
            item.Translations = new IDictionaryTranslation[]
            {
                new DictionaryTranslation(lang.Id, "item-value"),
            };
            service.Save(item);

            // Refresh the cache manually because we can't unbind
            service.GetDictionaryItemById(item.Id);
            service.GetLanguageById(lang.Id);

            // global cache contains the entity
            var globalCached = (IDictionaryItem)globalCache.Get(GetCacheIdKey<IDictionaryItem>(item.Id), () => null);
            Assert.IsNotNull(globalCached);
            Assert.AreEqual(item.Id, globalCached.Id);
            Assert.AreEqual("item-key", globalCached.ItemKey);

            Assert.IsNull(scopeProvider.AmbientScope);
            using (IScope scope = scopeProvider.CreateScope(repositoryCacheMode: RepositoryCacheMode.Scoped))
            {
                Assert.IsInstanceOf<Scope>(scope);
                Assert.IsNotNull(scopeProvider.AmbientScope);
                Assert.AreSame(scope, scopeProvider.AmbientScope);

                // scope has its own isolated cache
                IAppPolicyCache scopedCache = scope.IsolatedCaches.GetOrCreate(typeof(IDictionaryItem));
                Assert.AreNotSame(globalCache, scopedCache);

                item.ItemKey = "item-changed";
                service.Save(item);

                // scoped cache contains the "new" entity
                var scopeCached = (IDictionaryItem)scopedCache.Get(GetCacheIdKey<IDictionaryItem>(item.Id), () => null);
                Assert.IsNotNull(scopeCached);
                Assert.AreEqual(item.Id, scopeCached.Id);
                Assert.AreEqual("item-changed", scopeCached.ItemKey);

                // global cache is unchanged
                globalCached = (IDictionaryItem)globalCache.Get(GetCacheIdKey<IDictionaryItem>(item.Id), () => null);
                Assert.IsNotNull(globalCached);
                Assert.AreEqual(item.Id, globalCached.Id);
                Assert.AreEqual("item-key", globalCached.ItemKey);

                if (complete)
                {
                    scope.Complete();
                }
            }

            Assert.IsNull(scopeProvider.AmbientScope);

            globalCached = (IDictionaryItem)globalCache.Get(GetCacheIdKey<IDictionaryItem>(item.Id), () => null);
            if (complete)
            {
                // global cache has been cleared
                Assert.IsNull(globalCached);
            }
            else
            {
                // global cache has *not* been cleared
                Assert.IsNotNull(globalCached);
            }

            // get again, updated if completed
            item = service.GetDictionaryItemById(item.Id);
            Assert.AreEqual(complete ? "item-changed" : "item-key", item.ItemKey);

            // global cache contains the entity again
            globalCached = (IDictionaryItem)globalCache.Get(GetCacheIdKey<IDictionaryItem>(item.Id), () => null);
            Assert.IsNotNull(globalCached);
            Assert.AreEqual(item.Id, globalCached.Id);
            Assert.AreEqual(complete ? "item-changed" : "item-key", globalCached.ItemKey);
        }

        public static string GetCacheIdKey<T>(object id) => $"{GetCacheTypeKey<T>()}{id}";

        public static string GetCacheTypeKey<T>() => $"uRepo_{typeof(T).Name}_";
        
        public class LocalServerMessenger : ServerMessengerBase
        {
            public LocalServerMessenger()
                : base(false)
            { }

            public override void SendMessages() { }

            public override void Sync() { }

            protected override void DeliverRemote(ICacheRefresher refresher, MessageType messageType, IEnumerable<object> ids = null, string json = null)
            {
            }
        }
    }
}