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

using FakeItEasy;
using Microsoft.Extensions.Logging;
using Squidex.Domain.Apps.Core.Rules;
using Squidex.Domain.Apps.Core.Rules.Triggers;
using Squidex.Domain.Apps.Entities.Rules.Commands;
using Squidex.Domain.Apps.Entities.TestHelpers;
using Squidex.Domain.Apps.Events.Rules;
using Squidex.Infrastructure;
using Squidex.Infrastructure.EventSourcing;
using Xunit;

namespace Squidex.Domain.Apps.Entities.Rules.DomainObject
{
    public class RuleDomainObjectTests : HandlerTestBase<RuleDomainObject.State>
    {
        private readonly IAppProvider appProvider = A.Fake<IAppProvider>();
        private readonly IRuleEnqueuer ruleEnqueuer = A.Fake<IRuleEnqueuer>();
        private readonly DomainId ruleId = DomainId.NewGuid();
        private readonly RuleDomainObject sut;

        protected override DomainId Id
        {
            get => DomainId.Combine(AppId, ruleId);
        }

        public sealed record TestAction : RuleAction
        {
            public int Value { get; set; }
        }

        public RuleDomainObjectTests()
        {
            var log = A.Fake<ILogger<RuleDomainObject>>();

            sut = new RuleDomainObject(PersistenceFactory, log, appProvider, ruleEnqueuer);
#pragma warning disable MA0056 // Do not call overridable members in constructor
            sut.Setup(Id);
#pragma warning restore MA0056 // Do not call overridable members in constructor
        }

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

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

        [Fact]
        public async Task Create_should_create_events_and_set_intitial_state()
        {
            var command = MakeCreateCommand();

            var result = await PublishAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.Equal(AppId, sut.Snapshot.AppId.Id);

            Assert.Same(command.Trigger, sut.Snapshot.RuleDef.Trigger);
            Assert.Same(command.Action, sut.Snapshot.RuleDef.Action);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateRuleEvent(new RuleCreated { Trigger = command.Trigger!, Action = command.Action! })
                );
        }

        [Fact]
        public async Task Update_should_create_events_and_update_trigger_and_action()
        {
            var command = MakeUpdateCommand();

            await ExecuteCreateAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.True(sut.Snapshot.RuleDef.IsEnabled);

            Assert.Same(command.Trigger, sut.Snapshot.RuleDef.Trigger);
            Assert.Same(command.Action, sut.Snapshot.RuleDef.Action);

            Assert.Equal(command.Name, sut.Snapshot.RuleDef.Name);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateRuleEvent(new RuleUpdated { Trigger = command.Trigger, Action = command.Action, Name = command.Name })
                );
        }

        [Fact]
        public async Task Enable_should_create_events_and_update_enabled_flag()
        {
            var command = new EnableRule();

            await ExecuteCreateAsync();
            await ExecuteDisableAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.True(sut.Snapshot.RuleDef.IsEnabled);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateRuleEvent(new RuleEnabled())
                );
        }

        [Fact]
        public async Task Enable_via_update_should_create_events_and_update_enabled_flag()
        {
            var command = new UpdateRule
            {
                IsEnabled = true
            };

            await ExecuteCreateAsync();
            await ExecuteDisableAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.True(sut.Snapshot.RuleDef.IsEnabled);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateRuleEvent(new RuleUpdated { IsEnabled = true })
                );
        }

        [Fact]
        public async Task Disable_should_create_events_and_update_enabled_flag()
        {
            var command = new DisableRule();

            await ExecuteCreateAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.False(sut.Snapshot.RuleDef.IsEnabled);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateRuleEvent(new RuleDisabled())
                );
        }

        [Fact]
        public async Task Disable_via_update_should_create_events_and_update_enabled_flag()
        {
            var command = new UpdateRule
            {
                IsEnabled = false
            };

            await ExecuteCreateAsync();

            var result = await PublishIdempotentAsync(command);

            result.ShouldBeEquivalent(sut.Snapshot);

            Assert.False(sut.Snapshot.RuleDef.IsEnabled);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateRuleEvent(new RuleUpdated { IsEnabled = false })
                );
        }

        [Fact]
        public async Task Delete_should_create_events_and_update_deleted_flag()
        {
            var command = new DeleteRule();

            await ExecuteCreateAsync();

            var result = await PublishAsync(command);

            result.ShouldBeEquivalent(None.Value);

            Assert.True(sut.Snapshot.IsDeleted);

            LastEvents
                .ShouldHaveSameEvents(
                    CreateRuleEvent(new RuleDeleted())
                );
        }

        [Fact]
        public async Task Trigger_should_invoke_rule_enqueue_but_not_change_snapshot()
        {
            var command = new TriggerRule();

            await ExecuteCreateAsync();

            await PublishAsync(command);

            Assert.Equal(0, sut.Version);

            A.CallTo(() => ruleEnqueuer.EnqueueAsync(sut.Snapshot.RuleDef, sut.Snapshot.Id,
                    A<Envelope<IEvent>>.That.Matches(x => x.Payload is RuleManuallyTriggered)))
                .MustHaveHappened();
        }

        private Task ExecuteCreateAsync()
        {
            return PublishAsync(MakeCreateCommand());
        }

        private Task ExecuteDisableAsync()
        {
            return PublishAsync(new DisableRule());
        }

        private Task ExecuteDeleteAsync()
        {
            return PublishAsync(new DeleteRule());
        }

        private T CreateRuleEvent<T>(T @event) where T : RuleEvent
        {
            @event.RuleId = ruleId;

            return CreateEvent(@event);
        }

        private T CreateRuleCommand<T>(T command) where T : RuleCommand
        {
            command.RuleId = ruleId;

            return CreateCommand(command);
        }

        private static CreateRule MakeCreateCommand()
        {
            return new CreateRule
            {
                Trigger = new ContentChangedTriggerV2
                {
                    HandleAll = false
                },
                Action = new TestAction
                {
                    Value = 123
                }
            };
        }

        private static UpdateRule MakeUpdateCommand()
        {
            return new UpdateRule
            {
                Name = "NewName",
                Trigger = new ContentChangedTriggerV2
                {
                    HandleAll = true
                },
                Action = new TestAction
                {
                    Value = 456
                }
            };
        }

        private Task<object> PublishIdempotentAsync(RuleCommand command)
        {
            return PublishIdempotentAsync(sut, CreateRuleCommand(command));
        }

        private async Task<object?> PublishAsync(RuleCommand command)
        {
            var result = await sut.ExecuteAsync(CreateRuleCommand(command));

            return result.Payload;
        }
    }
}