using System;
using System.Threading;
using System.Threading.Tasks;
using Util.Events;
using Util.Exceptions;
using Util.Tests.EventHandlers;
using Util.Tests.Events;
using Util.Tests.Fakes;
using Util.Tests.Infrastructure;
using Util.Tests.Models;
using Util.Tests.Repositories;
using Util.Tests.UnitOfWorks;
using Xunit;
using Xunit.Abstractions;

namespace Util.Data.EntityFrameworkCore.Tests;

/// <summary>
/// 实体事件测试
/// </summary>
public class EntityEventsTest : TestBase {

    #region 测试初始化

    /// <summary>
    /// 测试输出
    /// </summary>
    private readonly ITestOutputHelper _testOutputHelper;
    /// <summary>
    /// 产品仓储
    /// </summary>
    private readonly IProductRepository _productRepository;
    /// <summary>
    /// 操作日志仓储
    /// </summary>
    private readonly IOperationLogRepository _operationLogRepository;
    /// <summary>
    /// 事件总线
    /// </summary>
    private readonly IEventBus _eventBus;

    /// <summary>
    /// 测试初始化
    /// </summary>
    public EntityEventsTest( ITestOutputHelper testOutputHelper, IProductRepository productRepository,
        IOperationLogRepository operationLogRepository, ITestUnitOfWork unitOfWork, IEventBus eventBus ) : base( unitOfWork ) {
        _testOutputHelper = testOutputHelper;
        _productRepository = productRepository;
        _operationLogRepository = operationLogRepository;
        _eventBus = eventBus;
    }

    #endregion

    #region 实体创建事件

    /// <summary>
    /// 测试实体创建事件
    /// </summary>
    [Fact]
    public async Task TestEntityCreatedEvent() {
        //添加实体
        var entity = ProductFakeService.GetProduct();
        entity.Init();
        entity.Name = "EntityCreatedEvent";
        await _productRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();

        //验证
        Assert.True( await _operationLogRepository.ExistsAsync( t => t.Caption == "EntityCreatedEvent" && t.LogName == nameof( ProductCreatedEventHandler ) ) );
    }

    /// <summary>
    /// 测试实体变更事件 - 创建
    /// </summary>
    [Fact]
    public async Task TestEntityChangedEvent_Created() {
        //添加实体
        var entity = ProductFakeService.GetProduct();
        entity.Init();
        entity.Name = "EntityChangedEvent_Created";
        await _productRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();

        //验证
        Assert.True( await _operationLogRepository.ExistsAsync( t => t.Caption == "EntityChangedEvent_Created" && t.LogName == nameof( ProductChangedEventHandler ) ) );
    }

    #endregion

    #region 实体修改事件

    /// <summary>
    /// 测试实体修改事件
    /// </summary>
    [Fact]
    public async Task TestEntityUpdatedEvent() {
        //添加实体
        var entity = ProductFakeService.GetProduct();
        entity.Init();
        await _productRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();
        UnitOfWork.ClearCache();

        //修改实体
        var product = await _productRepository.FindByIdAsync( entity.Id );
        product.Name = "EntityUpdatedEvent";
        await _productRepository.UpdateAsync( product );
        await UnitOfWork.CommitAsync();

        //验证
        Assert.True( await _operationLogRepository.ExistsAsync( t => t.Caption == "EntityUpdatedEvent" && t.LogName == nameof( ProductUpdatedEventHandler ) ) );
    }

    /// <summary>
    /// 测试实体变更事件 - 修改
    /// </summary>
    [Fact]
    public async Task TestEntityChangedEvent_Updated() {
        //添加实体
        var entity = ProductFakeService.GetProduct();
        entity.Init();
        await _productRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();
        UnitOfWork.ClearCache();

        //修改实体
        var product = await _productRepository.FindByIdAsync( entity.Id );
        product.Name = "EntityChangedEvent_Updated";
        await _productRepository.UpdateAsync( product );
        await UnitOfWork.CommitAsync();

        //验证
        Assert.True( await _operationLogRepository.ExistsAsync( t => t.Caption == "EntityChangedEvent_Updated" && t.LogName == nameof( ProductChangedEventHandler ) ) );
    }

    #endregion

    #region 实体删除事件

    /// <summary>
    /// 测试实体删除事件 - 逻辑删除
    /// </summary>
    [Fact]
    public async Task TestEntityDeletedEvent_1() {
        //添加实体
        var entity = ProductFakeService.GetProduct();
        entity.Init();
        entity.Name = "EntityDeletedEvent";
        await _productRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();

        //删除实体
        await _productRepository.RemoveAsync( entity );
        await UnitOfWork.CommitAsync();

        //验证
        Assert.True( await _operationLogRepository.ExistsAsync( t => t.Caption == "EntityDeletedEvent" && t.LogName == nameof( ProductDeletedEventHandler ) ) );
    }

    /// <summary>
    /// 测试实体删除事件 - 物理删除
    /// </summary>
    [Fact]
    public async Task TestEntityDeletedEvent_2() {
        //添加实体
        var entity = OperationLogFakeService.GetOperationLog();
        entity.Init();
        entity.LogName = "EntityDeletedEvent";
        await _operationLogRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();

        //删除实体
        await _operationLogRepository.RemoveAsync( entity );
        await UnitOfWork.CommitAsync();

        //验证
        Assert.True( await _operationLogRepository.ExistsAsync( t => t.LogName == "Test" && t.Caption == nameof( OperationLogDeletedEventHandler ) && t.Content == "EntityDeletedEvent" ) );
    }

    /// <summary>
    /// 测试实体变更事件 - 逻辑删除
    /// </summary>
    [Fact]
    public async Task TestEntityChangedEvent_Deleted_1() {
        //添加实体
        var entity = ProductFakeService.GetProduct();
        entity.Init();
        entity.Name = "EntityChangedEvent_Deleted";
        await _productRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();

        //删除实体
        await _productRepository.RemoveAsync( entity );
        await UnitOfWork.CommitAsync();

        //验证
        Assert.True( await _operationLogRepository.ExistsAsync( t => t.Caption == "EntityChangedEvent_Deleted" && t.LogName == nameof( ProductChangedEventHandler ) ) );
    }

    /// <summary>
    /// 测试实体变更事件 - 物理删除
    /// </summary>
    [Fact]
    public async Task TestEntityChangedEvent_Deleted_2() {
        //添加实体
        var entity = OperationLogFakeService.GetOperationLog();
        entity.Init();
        entity.LogName = "EntityChangedEvent_Deleted";
        await _operationLogRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();

        //删除实体
        await _operationLogRepository.RemoveAsync( entity );
        await UnitOfWork.CommitAsync();

        //验证
        Assert.True( await _operationLogRepository.ExistsAsync( t => t.LogName == "Test" && t.Caption == nameof( OperationLogChangedEventHandler ) && t.Content == "EntityChangedEvent_Deleted" ) );
    }

    #endregion

    #region 领域事件

    /// <summary>
    /// 测试领域事件 - 添加一个本地事件
    /// </summary>
    [Fact]
    public async Task TestDomainEvent_1() {
        //添加实体
        var entity = ProductFakeService.GetProduct();
        entity.Init();
        await _productRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();

        var code = $"TestDomainEvent_{entity.Id}";
        try {
            entity = await _productRepository.FindByIdAsync( entity.Id );
            entity.Code = code;
            entity.TestDomainEvent1();

            //保存前触发事件处理器,抛出异常
            await UnitOfWork.CommitAsync();
        }
        catch ( Warning ex ) {
            //事件处理器抛出异常消息为实体ID
            Assert.Equal( entity.Id.ToString(), ex.Message );

            //保存前触发事件,所以没有保存成功
            entity = await _productRepository.SingleAsync( t => t.Code == code );
            Assert.Null( entity );
            return;
        }
        Assert.Fail();
    }

    /// <summary>
    /// 测试领域事件 - 添加一个集成事件
    /// </summary>
    [Fact]
    public async Task TestDomainEvent_2() {
        //添加实体
        var entity = ProductFakeService.GetProduct();
        entity.Init();
        await _productRepository.AddAsync( entity );
        await UnitOfWork.CommitAsync();

        var description = $"TestDomainEvent_{entity.Id}";
        try {
            entity = await _productRepository.FindByIdAsync( entity.Id );
            entity.Description = description;
            entity.TestDomainEvent2();

            //保存后触发事件处理器,抛出异常
            await UnitOfWork.CommitAsync();
        }
        catch ( Warning ex ) {
            //事件处理器抛出异常消息为实体ID
            Assert.Equal( entity.Id.ToString(), ex.Message );

            //保存后触发事件,所以保存成功
            entity = await _productRepository.SingleAsync( t => t.Description == description );
            Assert.NotNull( entity );
            return;
        }
        Assert.Fail();
    }

    #endregion

    #region TestEventBus_ServiceLifetime_Transient

    /// <summary>
    /// 测试内存事件总线服务生命周期
    /// </summary>
    [Fact]
    public async Task TestEventBus_ServiceLifetime_Transient() {
        var entity = new Product( Guid.NewGuid() ) {
            Code = "Code",
            Name = "Name"
        };
        await _productRepository.AddAsync( entity );
        await _eventBus.PublishAsync( new TestEvent() { Id = entity.Id } );
    }

    /// <summary>
    /// 内存事件处理器能,获取实体
    /// </summary>
    public class TestEventHandler : EventHandlerBase<TestEvent> {
        private readonly IProductRepository _repository;
        public TestEventHandler( IProductRepository applicationRepository ) {
            _repository = applicationRepository;
        }
        public override async Task HandleAsync( TestEvent @event, CancellationToken cancellationToken ) {
            var entity = await _repository.FindByIdAsync( @event.Id, cancellationToken );
            Assert.NotNull( entity );
            Assert.Equal( "Name", entity.Name );
        }
    }

    #endregion
}