// ==========================================================================
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex UG (haftungsbeschränkt)
//  All rights reserved. Licensed under the MIT license.
// ==========================================================================

using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using FakeItEasy;
using Squidex.Assets;
using Squidex.Domain.Apps.Core.Assets;
using Squidex.Domain.Apps.Core.Tags;
using Squidex.Domain.Apps.Entities.Assets.Commands;
using Squidex.Domain.Apps.Entities.Contents;
using Squidex.Domain.Apps.Entities.Contents.Repositories;
using Squidex.Domain.Apps.Entities.TestHelpers;
using Squidex.Domain.Apps.Events.Assets;
using Squidex.Infrastructure;
using Squidex.Log;
using Xunit;

namespace Squidex.Domain.Apps.Entities.Assets.DomainObject
{
    public class AssetDomainObjectTests : HandlerTestBase<AssetDomainObject.State>
    {
        private readonly IContentRepository contentRepository = A.Fake<IContentRepository>();
        private readonly ITagService tagService = A.Fake<ITagService>();
        private readonly IAssetQueryService assetQuery = A.Fake<IAssetQueryService>();
        private readonly DomainId parentId = DomainId.NewGuid();
        private readonly DomainId assetId = DomainId.NewGuid();
        private readonly AssetFile file = new NoopAssetFile();
        private readonly AssetDomainObject sut;

        protected override DomainId Id
        {
            get => assetId;
        }

        public AssetDomainObjectTests()
        {
            A.CallTo(() => assetQuery.FindAssetFolderAsync(AppId, parentId))
                .Returns(new List<IAssetFolderEntity> { A.Fake<IAssetFolderEntity>() });

            A.CallTo(() => tagService.NormalizeTagsAsync(AppId, TagGroups.Assets, A<HashSet<string>>._, A<HashSet<string>>._))
                .ReturnsLazily(x => Task.FromResult(x.GetArgument<HashSet<string>>(2)?.ToDictionary(x => x) ?? new Dictionary<string, string>()));

            sut = new AssetDomainObject(Store, A.Dummy<ISemanticLog>(), tagService, assetQuery, contentRepository);
            sut.Setup(Id);
        }

        [Fact]
        public async Task Command_should_throw_exception_if_asset_is_deleted()
        {
            await ExecuteCreateAsync();
            await ExecuteDeleteAsync();

            await Assert.ThrowsAsync<DomainObjectDeletedException>(ExecuteUpdateAsync);
        }

        [Fact]
        public async Task Create_should_create_events_and_set_intitial_state()
        {
            var command = new CreateAsset { File = file, FileHash = "NewHash" };

            var result = await PublishAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(0, sut.Snapshot.FileVersion);
            Assert.Equal(command.FileHash, sut.Snapshot.FileHash);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetCreated
                    {
                        FileName = file.FileName,
                        FileSize = file.FileSize,
                        FileHash = command.FileHash,
                        FileVersion = 0,
                        Metadata = new AssetMetadata(),
                        MimeType = file.MimeType,
                        Tags = new HashSet<string>(),
                        Slug = file.FileName.ToAssetSlug()
                    })
                );
        }

        [Fact]
        public async Task Create_should_recreate_deleted_content()
        {
            var command = new CreateAsset { File = file, FileHash = "NewHash" };

            await ExecuteCreateAsync();
            await ExecuteDeleteAsync();

            await PublishAsync(command);
        }

        [Fact]
        public async Task Create_should_recreate_permanently_deleted_content()
        {
            var command = new CreateAsset { File = file, FileHash = "NewHash" };

            await ExecuteCreateAsync();
            await ExecuteDeleteAsync(true);

            await PublishAsync(command);
        }

        [Fact]
        public async Task Upsert_should_create_events_and_set_intitial_state_when_not_found()
        {
            var command = new UpsertAsset { File = file, FileHash = "NewHash" };

            var result = await PublishAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(0, sut.Snapshot.FileVersion);
            Assert.Equal(command.FileHash, sut.Snapshot.FileHash);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetCreated
                    {
                        FileName = file.FileName,
                        FileSize = file.FileSize,
                        FileHash = command.FileHash,
                        FileVersion = 0,
                        Metadata = new AssetMetadata(),
                        MimeType = file.MimeType,
                        Tags = new HashSet<string>(),
                        Slug = file.FileName.ToAssetSlug()
                    })
                );
        }

        [Fact]
        public async Task Upsert_should_create_events_and_update_file_state_when_found()
        {
            var command = new UpsertAsset { File = file, FileHash = "NewHash" };

            await ExecuteCreateAsync();

            var result = await PublishAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(1, sut.Snapshot.FileVersion);
            Assert.Equal(command.FileHash, sut.Snapshot.FileHash);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetUpdated
                    {
                        FileSize = file.FileSize,
                        FileHash = command.FileHash,
                        FileVersion = 1,
                        Metadata = new AssetMetadata(),
                        MimeType = file.MimeType
                    })
                );
        }

        [Fact]
        public async Task Update_should_create_events_and_update_file_state()
        {
            var command = new UpdateAsset { File = file, FileHash = "NewHash" };

            await ExecuteCreateAsync();

            var result = await PublishAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(1, sut.Snapshot.FileVersion);
            Assert.Equal(command.FileHash, sut.Snapshot.FileHash);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetUpdated
                    {
                        FileSize = file.FileSize,
                        FileHash = command.FileHash,
                        FileVersion = 1,
                        Metadata = new AssetMetadata(),
                        MimeType = file.MimeType
                    })
                );
        }

        [Fact]
        public async Task AnnotateName_should_create_events_and_update_file_name()
        {
            var command = new AnnotateAsset { FileName = "My New Image.png" };

            await ExecuteCreateAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(command.FileName, sut.Snapshot.FileName);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetAnnotated { FileName = command.FileName })
                );
        }

        [Fact]
        public async Task AnnotateSlug_should_create_events_and_update_slug()
        {
            var command = new AnnotateAsset { Slug = "my-new-image.png" };

            await ExecuteCreateAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(command.Slug, sut.Snapshot.Slug);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetAnnotated { Slug = command.Slug })
                );
        }

        [Fact]
        public async Task AnnotateProtected_should_create_events_and_update_protected_flag()
        {
            var command = new AnnotateAsset { IsProtected = true };

            await ExecuteCreateAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(command.IsProtected, sut.Snapshot.IsProtected);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetAnnotated { IsProtected = command.IsProtected })
                );
        }

        [Fact]
        public async Task AnnotateMetadata_should_create_events_and_update_metadata()
        {
            var command = new AnnotateAsset { Metadata = new AssetMetadata().SetPixelWidth(800) };

            await ExecuteCreateAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(command.Metadata, sut.Snapshot.Metadata);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetAnnotated { Metadata = command.Metadata })
                );
        }

        [Fact]
        public async Task AnnotateTags_should_create_events_and_update_tags()
        {
            var command = new AnnotateAsset { Tags = new HashSet<string> { "tag1" } };

            await ExecuteCreateAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetAnnotated { Tags = new HashSet<string> { "tag1" } })
                );
        }

        [Fact]
        public async Task Move_should_create_events_and_update_parent_id()
        {
            var command = new MoveAsset { ParentId = parentId };

            await ExecuteCreateAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(parentId, sut.Snapshot.ParentId);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetMoved { ParentId = parentId })
                );
        }

        [Fact]
        public async Task Delete_should_create_events_with_total_file_size_and_update_deleted_flag()
        {
            var command = new DeleteAsset();

            await ExecuteCreateAsync();
            await ExecuteUpdateAsync();

            var result = await PublishAsync(command);

            result.ShouldBeEquivalent(None.Value);

            Assert.True(sut.Snapshot.IsDeleted);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateAssetEvent(new AssetDeleted { DeletedSize = 2048 })
                );
        }

        [Fact]
        public async Task Delete_should_not_create_events_if_permanent()
        {
            var command = new DeleteAsset { Permanent = true };

            await ExecuteCreateAsync();

            A.CallTo(() => contentRepository.HasReferrersAsync(AppId, Id, SearchScope.All))
                .Returns(true);

            var result = await PublishAsync(command);

            result.ShouldBeEquivalent(None.Value);

            Assert.Equal(EtagVersion.Empty, sut.Snapshot.Version);
            Assert.Empty(LastEvents);
        }

        [Fact]
        public async Task Delete_should_throw_exception_if_referenced_by_other_item()
        {
            var command = new DeleteAsset { CheckReferrers = true };

            await ExecuteCreateAsync();

            A.CallTo(() => contentRepository.HasReferrersAsync(AppId, Id, SearchScope.All))
                .Returns(true);

            await Assert.ThrowsAsync<DomainException>(() => PublishAsync(command));
        }

        [Fact]
        public async Task Delete_should_not_throw_exception_if_referenced_by_other_item_but_forced()
        {
            var command = new DeleteAsset();

            await ExecuteCreateAsync();

            A.CallTo(() => contentRepository.HasReferrersAsync(AppId, Id, SearchScope.All))
                .Returns(true);

            await PublishAsync(command);
        }

        private Task ExecuteCreateAsync()
        {
            return PublishAsync(new CreateAsset { File = file, FileHash = "123" });
        }

        private Task ExecuteUpdateAsync()
        {
            return PublishAsync(new UpdateAsset { File = file, FileHash = "456" });
        }

        private Task ExecuteDeleteAsync(bool permanent = false)
        {
            return PublishAsync(new DeleteAsset { Permanent = permanent });
        }

        private T CreateAssetEvent<T>(T @event) where T : AssetEvent
        {
            @event.AssetId = assetId;

            return CreateEvent(@event);
        }

        private T CreateAssetCommand<T>(T command) where T : AssetCommand
        {
            command.AssetId = assetId;

            return CreateCommand(command);
        }

        private Task<object> PublishIdempotentAsync(AssetCommand command)
        {
            return PublishIdempotentAsync(sut, CreateAssetCommand(command));
        }

        private async Task<object> PublishAsync(AssetCommand command)
        {
            var result = await sut.ExecuteAsync(CreateAssetCommand(command));

            return result.Payload;
        }
    }
}