using Hua.Todo.Core.Entities;
using Xunit;

namespace Hua.Todo.Host.Tests;

/// <summary>
/// TaskEntity 单元测试。
/// </summary>
public class TaskEntityTests
{
    /// <summary>
    /// 测试 TaskEntity 继承自 FullAuditedEntityWithUser。
    /// </summary>
    [Fact]
    public void TaskEntity_InheritsFromFullAuditedEntityWithUser()
    {
        // Arrange & Act
        var task = new TaskEntity();

        // Assert
        Assert.IsAssignableFrom<FullAuditedEntityWithUser<Guid, UserEntity>>(task);
    }

    /// <summary>
    /// 测试 TaskEntity 主键为 Guid 类型。
    /// </summary>
    [Fact]
    public void TaskEntity_IdIsGuid()
    {
        // Arrange & Act
        var task = new TaskEntity();

        // Assert
        Assert.Equal(Guid.Empty, task.Id);
    }

    /// <summary>
    /// 测试 TaskEntity 默认值。
    /// </summary>
    [Fact]
    public void TaskEntity_DefaultValues()
    {
        // Arrange & Act
        var task = new TaskEntity();

        // Assert
        Assert.Equal(string.Empty, task.Title);
        Assert.Equal(TaskPriority.Medium, task.Priority);
        Assert.False(task.IsCompleted);
        Assert.Null(task.ParentTaskId);
        Assert.Empty(task.SubTasks);
        Assert.False(task.IsDeleted);
        Assert.Null(task.DeletionTime);
        Assert.Null(task.DeleterId);
    }

    /// <summary>
    /// 测试创建任务时生成 Guid。
    /// </summary>
    [Fact]
    public void TaskEntity_NewInstance_HasUniqueId()
    {
        // Arrange & Act
        var task1 = new TaskEntity { Id = Guid.NewGuid() };
        var task2 = new TaskEntity { Id = Guid.NewGuid() };

        // Assert
        Assert.NotEqual(task1.Id, task2.Id);
    }
}

/// <summary>
/// FullAuditedEntityWithUser 基类单元测试。
/// </summary>
public class FullAuditedEntityWithUserTests
{
    /// <summary>
    /// 测试 ABP 审计字段默认值。
    /// </summary>
    [Fact]
    public void FullAuditedEntityWithUser_DefaultValues()
    {
        // Arrange & Act
        var entity = new TestAuditedEntity();

        // Assert
        Assert.Equal(Guid.Empty, entity.Id);
        Assert.False(entity.IsDeleted);
        Assert.Null(entity.DeletionTime);
        Assert.Null(entity.DeleterId);
        Assert.Null(entity.ExtraProperties);
        Assert.Null(entity.ConcurrencyStamp);
        Assert.Equal(default, entity.CreationTime);
        Assert.Null(entity.CreatorId);
        Assert.Null(entity.LastModificationTime);
        Assert.Null(entity.LastModifierId);
    }

    /// <summary>
    /// 测试 IUser 接口实现。
    /// </summary>
    [Fact]
    public void UserEntity_ImplementsIUser()
    {
        // Arrange & Act
        var user = new UserEntity
        {
            Id = Guid.NewGuid(),
            UserName = "testuser"
        };

        // Assert
        Assert.IsAssignableFrom<IUser<Guid>>(user);
        Assert.Equal("testuser", user.UserName);
    }

    /// <summary>
    /// 测试子类。
    /// </summary>
    private class TestAuditedEntity : FullAuditedEntityWithUser<Guid, UserEntity>
    {
    }
}