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

using System.Globalization;
using MongoDB.Bson;
using MongoDB.Driver;
using NodaTime;
using Squidex.Domain.Apps.Core.Assets;
using Squidex.Domain.Apps.Core.TestHelpers;
using Squidex.Domain.Apps.Entities.Assets.DomainObject;
using Squidex.Domain.Apps.Entities.MongoDb.Assets;
using Squidex.Domain.Apps.Entities.TestHelpers;
using Squidex.Infrastructure;
using Squidex.Infrastructure.Json.Objects;
using Squidex.Infrastructure.MongoDb;
using Squidex.Infrastructure.States;
using Xunit;

namespace Squidex.Domain.Apps.Entities.Assets.MongoDb
{
    public sealed class AssetsQueryFixture : IAsyncLifetime
    {
        private readonly Random random = new Random();
        private readonly int numValues = 250;
        private readonly IMongoClient mongoClient;
        private readonly IMongoDatabase mongoDatabase;

        public MongoAssetRepository AssetRepository { get; }

        public NamedId<DomainId>[] AppIds { get; } =
        {
            NamedId.Of(DomainId.Create("3b5ba909-e5a5-4858-9d0d-df4ff922d452"), "my-app1"),
            NamedId.Of(DomainId.Create("4b3672c1-97c6-4e0b-a067-71e9e9a29db9"), "my-app1")
        };

        public AssetsQueryFixture()
        {
            BsonJsonConvention.Register(TestUtils.DefaultOptions());

            mongoClient = new MongoClient(TestConfig.Configuration["mongodb:configuration"]);
            mongoDatabase = mongoClient.GetDatabase(TestConfig.Configuration["mongodb:database"]);

            AssetRepository = new MongoAssetRepository(mongoDatabase);
        }

        public Task DisposeAsync()
        {
            return Task.CompletedTask;
        }

        public async Task InitializeAsync()
        {
            await AssetRepository.InitializeAsync(default);

            await CreateDataAsync(default);
            await ClearProfileAsync(default);
        }

        private async Task CreateDataAsync(
            CancellationToken ct)
        {
            if (await AssetRepository.StreamAll(AppIds[0].Id, ct).AnyAsync(ct))
            {
                return;
            }

            var batch = new List<SnapshotWriteJob<AssetDomainObject.State>>();

            async Task ExecuteBatchAsync(AssetDomainObject.State? entity)
            {
                if (entity != null)
                {
                    batch.Add(new SnapshotWriteJob<AssetDomainObject.State>(entity.UniqueId, entity, 0));
                }

                if ((entity == null || batch.Count >= 1000) && batch.Count > 0)
                {
                    var store = (ISnapshotStore<AssetDomainObject.State>)AssetRepository;

                    await store.WriteManyAsync(batch, ct);

                    batch.Clear();
                }
            }

            var now = SystemClock.Instance.GetCurrentInstant();

            var user = RefToken.User("1");

            foreach (var appId in AppIds)
            {
                for (var i = 0; i < numValues; i++)
                {
                    var fileName = i.ToString(CultureInfo.InvariantCulture);

                    for (var j = 0; j < numValues; j++)
                    {
                        var tag = j.ToString(CultureInfo.InvariantCulture);

                        var asset = new AssetDomainObject.State
                        {
                            Tags = new HashSet<string> { tag },
                            Id = DomainId.NewGuid(),
                            Created = now,
                            CreatedBy = user,
                            FileHash = fileName,
                            FileName = fileName,
                            FileSize = 1024,
                            LastModified = now,
                            LastModifiedBy = user,
                            IsDeleted = false,
                            IsProtected = false,
                            Metadata = new AssetMetadata
                            {
                                ["value"] = JsonValue.Create(tag)
                            },
                            Slug = fileName
                        };

                        await ExecuteBatchAsync(asset);
                    }
                }
            }

            await ExecuteBatchAsync(null);
        }

        private async Task ClearProfileAsync(
            CancellationToken ct)
        {
            await mongoDatabase.RunCommandAsync<BsonDocument>("{ profile : 0 }", cancellationToken: ct);
            await mongoDatabase.DropCollectionAsync("system.profile", ct);
            await mongoDatabase.RunCommandAsync<BsonDocument>("{ profile : 2 }", cancellationToken: ct);
        }

        public DomainId RandomAppId()
        {
            return AppIds[random.Next(0, AppIds.Length)].Id;
        }

        public string RandomValue()
        {
            return random.Next(0, numValues).ToString(CultureInfo.InvariantCulture);
        }
    }
}