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

using FakeItEasy;
using Squidex.Domain.Apps.Core;
using Squidex.Domain.Apps.Core.Apps;
using Squidex.Domain.Apps.Entities.TestHelpers;
using Squidex.Infrastructure;
using Squidex.Infrastructure.Json.Objects;
using Squidex.Infrastructure.TestHelpers;
using Xunit;

namespace Squidex.Domain.Apps.Entities.Apps
{
    public sealed class AppUISettingsTests
    {
        private readonly CancellationTokenSource cts = new CancellationTokenSource();
        private readonly CancellationToken ct;
        private readonly TestState<AppUISettings.State> state;
        private readonly DomainId appId = DomainId.NewGuid();
        private readonly string userId = Guid.NewGuid().ToString();
        private readonly string stateId;
        private readonly AppUISettings sut;

        public AppUISettingsTests()
        {
            ct = cts.Token;

            stateId = $"{appId}_{userId}";
            state = new TestState<AppUISettings.State>(stateId);

            sut = new AppUISettings(state.PersistenceFactory);
        }

        [Fact]
        public void Should_run_with_default_order()
        {
            var order = ((IDeleter)sut).Order;

            Assert.Equal(0, order);
        }

        [Fact]
        public async Task Should_delete_contributor_state()
        {
            await ((IDeleter)sut).DeleteContributorAsync(appId, userId, ct);

            A.CallTo(() => state.Persistence.DeleteAsync(ct))
                .MustHaveHappened();
        }

        [Fact]
        public async Task Should_delete_app_and_contributors()
        {
            var app = Mocks.App(NamedId.Of(appId, "my-app"));

            A.CallTo(() => app.Contributors)
                .Returns(Contributors.Empty.Assign(userId, Role.Owner));

            var rootState = new TestState<AppUISettings.State>(appId, state.PersistenceFactory);

            await ((IDeleter)sut).DeleteAppAsync(app, ct);

            A.CallTo(() => state.Persistence.DeleteAsync(ct))
                .MustHaveHappened();

            A.CallTo(() => rootState.Persistence.DeleteAsync(ct))
                .MustHaveHappened();
        }

        [Fact]
        public async Task Should_set_setting()
        {
            await sut.SetAsync(appId, userId, new JsonObject().Add("key", 42), ct);

            var actual = await sut.GetAsync(appId, userId, ct);

            var expected =
                new JsonObject().Add("key", 42);

            Assert.Equal(expected.ToString(), actual.ToString());

            A.CallTo(() => state.Persistence.WriteSnapshotAsync(A<AppUISettings.State>._, ct))
                .MustHaveHappened();
        }

        [Fact]
        public async Task Should_set_root_value()
        {
            await sut.SetAsync(appId, userId, "key", 42, ct);

            var actual = await sut.GetAsync(appId, userId, ct);

            var expected =
                new JsonObject().Add("key", 42);

            Assert.Equal(expected.ToString(), actual.ToString());

            A.CallTo(() => state.Persistence.WriteSnapshotAsync(A<AppUISettings.State>._, ct))
                .MustHaveHappened();
        }

        [Fact]
        public async Task Should_remove_root_value()
        {
            await sut.SetAsync(appId, userId, "key", 42, ct);

            await sut.RemoveAsync(appId, userId, "key", ct);
            await sut.RemoveAsync(appId, userId, "key", ct);

            var actual = await sut.GetAsync(appId, userId, ct);

            var expected = new JsonObject();

            Assert.Equal(expected.ToString(), actual.ToString());

            A.CallTo(() => state.Persistence.WriteSnapshotAsync(A<AppUISettings.State>._, ct))
                .MustHaveHappenedTwiceExactly();
        }

        [Fact]
        public async Task Should_set_nested_value()
        {
            await sut.SetAsync(appId, userId, "root.nested", 42, ct);

            var actual = await sut.GetAsync(appId, userId, ct);

            var expected =
                new JsonObject().Add("root",
                    new JsonObject().Add("nested", 42));

            Assert.Equal(expected.ToString(), actual.ToString());

            A.CallTo(() => state.Persistence.WriteSnapshotAsync(A<AppUISettings.State>._, ct))
                .MustHaveHappened();
        }

        [Fact]
        public async Task Should_not_write_state_if_value_not_changed()
        {
            await sut.SetAsync(appId, userId, "root.nested", 42, ct);
            await sut.SetAsync(appId, userId, "root.nested", 42, ct);

            var actual = await sut.GetAsync(appId, userId, ct);

            var expected =
                new JsonObject().Add("root",
                    new JsonObject().Add("nested", 42));

            Assert.Equal(expected.ToString(), actual.ToString());

            A.CallTo(() => state.Persistence.WriteSnapshotAsync(A<AppUISettings.State>._, ct))
                .MustHaveHappenedOnceExactly();
        }

        [Fact]
        public async Task Should_remove_nested_value()
        {
            await sut.SetAsync(appId, userId, "root.nested", 42, ct);

            await sut.RemoveAsync(appId, userId, "root.nested", ct);
            await sut.RemoveAsync(appId, userId, "key", ct);

            var actual = await sut.GetAsync(appId, userId, ct);

            var expected =
                new JsonObject().Add("root",
                    new JsonObject());

            Assert.Equal(expected.ToString(), actual.ToString());

            A.CallTo(() => state.Persistence.WriteSnapshotAsync(A<AppUISettings.State>._, ct))
                .MustHaveHappenedTwiceExactly();
        }

        [Fact]
        public async Task Should_throw_exception_if_nested_not_an_object()
        {
            await sut.SetAsync(appId, userId, "root.nested", 42, ct);

            await Assert.ThrowsAsync<InvalidOperationException>(() => sut.SetAsync(appId, userId, "root.nested.value", 42, ct));
        }

        [Fact]
        public async Task Should_do_nothing_if_deleting_and_nested_not_found()
        {
            await sut.RemoveAsync(appId, userId, "root.nested", ct);

            A.CallTo(() => state.Persistence.WriteSnapshotAsync(A<AppUISettings.State>._, A<CancellationToken>._))
                .MustNotHaveHappened();
        }

        [Fact]
        public async Task Should_do_nothing_if_deleting_and_key_not_found()
        {
            await sut.RemoveAsync(appId, userId, "root", ct);

            A.CallTo(() => state.Persistence.WriteSnapshotAsync(A<AppUISettings.State>._, A<CancellationToken>._))
                .MustNotHaveHappened();
        }
    }
}